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CN109236521A - The variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic - Google Patents

The variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic Download PDF

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Publication number
CN109236521A
CN109236521A CN201810833791.4A CN201810833791A CN109236521A CN 109236521 A CN109236521 A CN 109236521A CN 201810833791 A CN201810833791 A CN 201810833791A CN 109236521 A CN109236521 A CN 109236521A
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CN
China
Prior art keywords
valve
oil
control valve
pressure
level
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201810833791.4A
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Chinese (zh)
Inventor
白云
肖朝辉
魏云鹏
范立云
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Harbin Engineering University
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Harbin Engineering University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Harbin Engineering University filed Critical Harbin Engineering University
Priority to CN201810833791.4A priority Critical patent/CN109236521A/en
Publication of CN109236521A publication Critical patent/CN109236521A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The purpose of the present invention is to provide the pressure-accumulating type electronic control fuel injection devices that fuel injection characteristic can be changed, including pressurization control valve portion, three-level piston component, Injection Control valve portion, needle-valve portion, oil injector body, pressure accumulation cavity wall.The present invention uses two-stage electromagnetic valve arrangement, controls the pressurization area of three-level piston, different pressure ratios can be effectively realized, so that fuel injection characteristic is more flexible；Using the valve rod of formula of, the response speed of injector control valve is accelerated；In addition pressure accumulation chamber can slowing oil injection when caused pressure oscillation, be conducive to the accurate control to distributive value, it is remarkably improved especially for the control precision of small oil mass, the pressure stabilization function of pressure accumulation chamber reduces the size of common rail pipe, so that the service life of common rail pipe extends；Two-way oil inlet is played the role of in the fluid power compensating piston mechanism that the present invention uses, the repairing in control chamber pressure release when building pressure, so that fuel injection characteristic realizes characteristic anxious after first delaying, improve oil spout performance.

Description

The variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic
Technical field
The present invention relates to a kind of diesel engines, specifically diesel fuel system.
Background technique
Tradition machinery formula fuel injector is since the injection characteristics such as injection timing, injection pressure and injection rate are by high-pressure oil feed The restriction of cam is pumped, it is not flexible that there are injection characteristics, low-response, the disadvantages of to distributive value control accuracy difference.With emission regulation It is increasingly strict, be difficult further improve engine economy and emission performance.
Electromagnetic control type fuel injector applied to Electronic Control for Fuel Injection System of Diesel Engine is responded compared to positive injector Faster, injection characteristics are flexibly controllable for speed, also more accurate to the control of distributive value.Although electromagnetic control type fuel injector is to diesel oil The emission performance of machine makes moderate progress, but there is also some shortcomings: fuel injector generallys use the form of single channel oil inlet, and needle-valve is taken a seat Response speed is slow, and the equilibrium relation due to passing in and out oilhole aperture, it is desirable to it is more difficult to further increase response characteristic；Two two The dynamic recirculating oil quantity of the form of port valve is larger, influences fuel utilization ratio；Axial gap between needle-valve and control plunger causes to spray There is static leakage fuel oil in oily device；Under big oil mass spray regime, under the uniformity and stability of each cylinder injection process Drop etc..
Summary of the invention
The purpose of the present invention is to provide be able to achieve to control pressure ratio flexibly to reach the fuel injection characteristic of different jeting effects Variable pressure-accumulating type electronic control fuel injection device.
The object of the present invention is achieved like this:
The variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic of the present invention, it is characterized in that: include oil injector body, pressure accumulation cavity wall, Pressurization control valve portion, three-level piston component, Injection Control valve portion, needle-valve portion, pressurization control valve portion and three-level piston It is mounted in oil injector body from top to bottom, Injection Control valve portion and needle-valve portion are arranged in from top to bottom in the tight cap of nozzle, tightly Cap of spraying nozzle is fixed below oil injector body, and pressure accumulation cavity wall is fixed on supercharger control valve upper, pressure accumulation is arranged in pressure accumulation cavity wall Chamber and high-pressure oil passage, pressure accumulation chamber are connected to high-pressure oil passage；
The pressurization control valve portion includes supercharger control valve upper valve base, supercharger control valve centre valve seat, dual-coil electromagnetic valve limit Position orifice plate, charged piston limit orifice plate, supercharger control valve valve rod, level-one armature, second level armature, bacterium shape sleeve, supercharger control valve Valve seat, dual-coil electromagnetic valve limit orifice plate and charged piston limit orifice plate are arranged from top to bottom among upper valve base, supercharger control valve, are pressurized The head of control valve valve rod, which is located at, limits the supercharger control valve valve chamber that orifice plate and charged piston limit orifice plate are constituted by dual-coil electromagnetic valve In, external is bacterium shape sleeve, and second level armature, the middle part installation of supercharger control valve valve rod are installed in the tail portion of supercharger control valve valve rod Level-one armature, second level armature are located among supercharger control valve in valve seat, and level-one armature is located in dual-coil electromagnetic valve limit orifice plate, pressurization Two-stage electromagnetic iron coil is wound in control valve upper valve base, winds level-one electromagnet coil, pressurization among supercharger control valve in valve seat Supercharger control valve valve rod reset spring, pressurization control are set between control valve valve rod tail portion and supercharger control valve upper valve base above it The part that valve valve rod processed is located at below level-one armature is cased with level-one armature fixed spring, the extension of bacterium shape sleeve and lower section Charged piston, which limits, is arranged bacterium shape sleeve spring between orifice plate, the head of supercharger control valve valve rod is machined with T-type way to cycle oil, T Type way to cycle oil includes the vertical access communicated and cross walkway, and dual-coil electromagnetic valve limits setting pressurization throttle orifice, second level on orifice plate Pressure Increasing Oil-Line, charged piston, which limits, is arranged level-one Pressure Increasing Oil-Line and low pressure oil leak hole on orifice plate, pressurization throttle orifice, two-stage supercharging oil Road, level-one Pressure Increasing Oil-Line are connected to supercharger control valve valve chamber with low pressure oil leak hole, are pressurized the other end connection high pressure oil of throttle orifice Road, low pressure oil leak hole are connected to fuel tank；
The three-level piston component includes charged piston, piston return spring, and charged piston is three-level stepped cylinder structure, It is respectively from top to bottom the first-third cylinder, and diameter successively decreases, the first cylinder and the charged piston above it limit between orifice plate Form plunger shaft, plunger shaft limits the hole in orifice plate by charged piston and is connected to high-pressure oil passage, the first cylinder and the second cylinder and Level-one booster cavity is formed between oil injector body, and two-stage supercharging chamber is formed between the second cylinder and third cylinder and oil injector body, the Three-level booster cavity is formed between three cylinders and oil injector body below, and piston return spring, level-one are installed in three-level booster cavity Booster cavity is connected to level-one Pressure Increasing Oil-Line, and two-stage supercharging chamber is connected to two-stage supercharging oil circuit, and three-level booster cavity is connected to high by check valve Pressure oil road, three-level booster cavity lower part are provided with Pressure Increasing Oil-Line；
The Injection Control valve portion includes injector control valve upper valve base, injector control valve limit orifice plate, intermediate orifice plate, spray Oil control valve valve rod, armature, injector control valve upper valve base, injector control valve limit orifice plate and intermediate orifice plate are arranged from top to bottom, The setting of injector control valve valve rod limits in orifice plate in injector control valve, and armature is installed on the top of injector control valve valve rod, armature with Injector control valve valve rod return spring, injector control valve valve rod return spring are installed between the injector control valve upper valve base above it Electromagnet coil is wound in external injector control valve upper valve base, and low pressure oil leak hole, oil spout control are set in injector control valve valve rod Valve limit orifice plate processed and intermediate orifice plate constitute injector control valve valve chamber, and injector control valve stem lower portion includes tapered protrusion, oil spout Control valve, which limits, is arranged injector control valve in-line on orifice plate, injector control valve in-line connection high-pressure oil passage, on intermediate orifice plate Oil inlet metering-orifice is set, and oil inlet metering-orifice is connected to injector control valve valve chamber；
The needle-valve portion includes needle-valve limit orifice plate, needle-valve block, and needle-valve limit orifice plate and needle-valve block are arranged from top to bottom Below intermediate orifice plate, fluid power compensating piston epicoele in-line, non-return passage are set in intermediate orifice plate, installs and stops in non-return passage Valve is returned, fluid power compensating piston epicoele in-line is connected to high-pressure oil passage, and non-return passage is connected to oil inlet metering-orifice, sets in needle-valve limit orifice plate Fluid power compensating piston, control chamber oil circuit are set, fluid power compensating piston reset spring is cased with outside fluid power compensating piston, fluid power compensation is lived The upper end of plug reset spring is withstood on fluid power compensating piston, and the lower end of fluid power compensating piston reset spring withstands on needle-valve below It limits on orifice plate, is formed on the fluid power compensating piston communicated with fluid power compensating piston epicoele in-line above fluid power compensating piston Chamber, fluid power compensating piston reset spring present position are fluid power compensating piston cavity of resorption, fluid power compensating piston lower end with below Needle-valve, which limits, forms fluid power compensating piston draining chamber, control chamber oil communication oil inlet metering-orifice between orifice plate；Needle is installed in needle-valve block Valve, needle-valve top are cased with needle-valve reset spring, and the upper end of needle-valve reset spring is withstood on needle-valve limit orifice plate, needle-valve reset spring Lower end withstand on needle-valve, needle-valve reset spring present position is control chamber, and control chamber is connected to control chamber oil circuit, is set in needle-valve block Oil holding slot in-line is set, forms oil holding slot between needle-valve and needle-valve block, spray orifice, oil holding slot in-line difference is arranged in needle-valve block bottom It is connected to oil holding slot and Pressure Increasing Oil-Line, fluid power compensating piston cavity of resorption is connected to stopping below check-valves by fluid power compensating piston in-line Channel is gone back to, fluid power compensating piston cavity of resorption is connected to control chamber by fluid power compensating piston vent line.
The present invention may also include:
1, without under boost mode, pressurization control valve portion no power, check valve is opened；When injector control valve partial current When, electromagnet attracts armature, and armature drives injector control valve valve rod to move upwards by conical surface seal and to open low pressure draining Hole, the fuel oil in control chamber enter electromagnetism valve chamber by the low pressure oil leak hole in injector control valve valve rod, exist using setting Low pressure oil way in electromagnetism valve chamber returns in low-pressure reservoir, and fluid power compensating piston moves downward, closure of check ring, fluid power compensation Piston is formed by the fuel-displaced road direction control chamber repairing of fluid power compensating piston when the elastic force of pressure and needle valve spring in control chamber When resultant force is less than the upward hydraulic coupling of fuel oil in oil holding slot, needle-valve is lifted up, and spray orifice is opened；When Injection Control valve portion powers off When, injector control valve valve rod is taken a seat under the elastic force effect of injector control valve valve rod return spring, by low pressure draining bore closure While open high-pressure oil passage, check-valves is opened, and control chamber builds pressure by oil inlet metering-orifice and fluid power compensating piston cavity of resorption again, when When the resultant force that the elastic force of pressure and needle valve spring in control chamber is formed is greater than the upward hydraulic coupling of fuel oil in oil holding slot, needle-valve weight Newly take a seat.
2, under low pressure charging mode, the level-one electromagnet coil power of pressurization control valve portion, level-one electromagnet attracts level-one Armature, level-one armature drive supercharger control valve valve rod to move upward to level-one electromagnet spacing place；Bacterium shape sleeve is in bacterium shape sleeve As supercharger control valve valve rod is lifted up under the action of spring force, low pressure oil leak hole is opened, above by bacterium shape sleeve Conical surface seal.Fuel oil in level-one booster cavity flows through low pressure oil leak hole by level-one Pressure Increasing Oil-Line and returns in low-pressure reservoir, increases Piston moves downward for pressure, the closed check valve at the oil inlet of three-level booster cavity；Subsequent injector control valve partial current, electromagnet Attract armature, armature drives injector control valve valve rod to move upwards by conical surface seal and to open low pressure oil leak hole, control chamber Interior fuel oil is flowed back in low-pressure reservoir by low pressure oil leak hole, and fluid power compensating piston moves downward, closure of check ring, fluid power compensation Piston is by the fuel-displaced road direction control chamber repairing of fluid power compensating piston, when the resultant force of control cavity pressure and needle valve spring is less than oil holding slot When interior fuel oil is to the hydraulic coupling of needle-valve, needle-valve is lifted up, and spray orifice is opened；When the power-off of Injection Control valve portion, Injection Control Valve valve rod is taken a seat under the elastic force effect of injector control valve valve rod return spring, is opened while by low pressure draining bore closure high Pressure oil road, check-valves are opened, and control chamber builds pressure by oil inlet metering-orifice and fluid power compensating piston cavity of resorption again, when the pressure in control chamber When the resultant force that the elastic force of power and needle valve spring is formed is greater than the upward hydraulic coupling of fuel oil in oil holding slot, needle-valve drops back into one's seat；Work as increasing When pressure control valve part powers off, supercharger control valve valve rod drives bacterium shape set under the spring-force driven dual of supercharger control valve reset spring Cylinder is taken a seat together, and the conical surface seal of bacterium shape sleeve upper end is opened while by low pressure draining bore closure, and high pressure fuel passes through one Grade Pressure Increasing Oil-Line reenters level-one booster cavity, and charged piston is again turned on back up into initial position, check valve, and fuel oil passes through Check valve enters in three-level booster cavity and enters back into oil holding slot.
3, under high pressure-charging mode, the level-one electromagnet coil power of pressurization control valve portion, level-one electromagnet attract first Level-one armature, level-one armature drive supercharger control valve valve rod to move upward to level-one electromagnet spacing place；Bacterium shape sleeve is in bacterium shape As supercharger control valve valve rod is lifted up under the action of sleeve spring power, until by the same of the conical surface seal above bacterium shape sleeve When open low pressure oil leak hole；The fuel oil in level-one booster cavity flows through low pressure oil leak hole by level-one Pressure Increasing Oil-Line and returns to low pressure at this time In fuel tank, then the two-stage electromagnetic iron coil of pressurization control valve portion is powered, and two-stage electromagnetic iron attracts second level armature, then second level Armature drives supercharger control valve valve rod to be detached from level-one armature and continues up at second level limiting position of armature；Supercharger control valve valve rod It is detached from the continuation of bacterium shape sleeve up to move, T-type way to cycle oil be opened, the intracavitary fuel oil of two-stage supercharging passes through two-stage supercharging oil circuit Flow back into low-pressure reservoir by the T-type way to cycle oil in bacterium shape sleeve again, charged piston moves downward, three-level booster cavity into The closed check valve of oil port；Then injector control valve partial current, electromagnet attract armature, and armature drives Injection Control valve rod It moves upwards by conical surface seal and to open low pressure oil leak hole, the fuel oil in control chamber flows back to low pressure oil by low pressure oil leak hole In case, fluid power compensating piston is moved downward, closure of check ring, and fluid power compensating piston passes through the fuel-displaced road direction control of fluid power compensating piston Chamber repairing, when the resultant force for controlling cavity pressure and needle valve spring is less than the hydraulic coupling of fuel oil in oil holding slot to needle-valve, needle-valve is upward It lifts, spray orifice oil spout；When the power-off of Injection Control valve portion, injector control valve valve rod is in injector control valve valve rod return spring It takes a seat under elastic force effect, high-pressure oil passage is opened while by low pressure draining bore closure, check-valves is opened, and control chamber passes through oil inlet Metering-orifice and fluid power compensating piston cavity of resorption build pressure again, when the resultant force that the elastic force of pressure and needle valve spring in control chamber is formed is greater than In oil holding slot when the upward hydraulic coupling of fuel oil, needle-valve drops back into one's seat；When the power-off of pressurization control valve portion, supercharger control valve valve rod Bacterium shape sleeve is driven to take a seat together under the spring-force driven dual of supercharger control valve reset spring, it is first that T-type way to cycle oil is laterally oily Road is closed, and the conical surface seal of bacterium shape sleeve upper end is then opened while by low pressure draining bore closure, and high pressure fuel passes through one Grade Pressure Increasing Oil-Line and two-stage supercharging oil circuit reenter level-one booster cavity and two-stage supercharging chamber, and charged piston is back up into initial bit It sets, check valve is again turned on, and fuel oil is entered in three-level booster cavity by check valve and enters back into oil holding slot.
4, at three rib type parts at supercharger control valve valve rod and bacterium shape sleeve cooperation, bacterium shape sleeve lining length is longer than trigone Type partial-length.
Present invention has an advantage that the pressure-accumulating type electronic control fuel injection device that 1, fuel injection characteristic of the invention can be changed uses three-level step The charged piston of circular table changes pressure ratio by way of changing pressure application surface product, makes the fuel pressure in oil holding slot It can be adjusted according to actual condition, effectively improve the flexibility of oil spout, diesel engine is enable to better meet sternly The emission regulation demands of lattice, the effective economy and dynamic property for improving diesel engine；2, the supercharger control valve energy that the present invention uses It is enough to realize multistage positioning, it realizes that the on-off of a plurality of Pressure Increasing Oil-Line is controllable, so as to adjust the high pressure oil active area of charged piston, protects Demonstrate,prove the flexible control of electric-controlled fuel injector pressure ratio；3, the low pressure oil leak hole in injector control valve valve rod is connected with electromagnetism valve chamber, Fuel oil in control chamber also plays the effect of cooling solenoid valve by the oil return of low pressure oil leak hole, can increase solenoid valve The stability of work, in addition the low pressure oil leak hole in control valve valve rod reduces the quality of injector control valve valve rod, makes oil spout control Response valve processed is accelerated；4, pressure accumulation chamber can slowing oil injection when caused pressure oscillation, be conducive to the accurate control to distributive value System, is remarkably improved especially for the control precision of small oil mass.Requirement of the common rail pipe to material is advantageously reduced simultaneously, is improved Its service life；It is provided with AND DEWATERING FOR ORIFICE STRUCTURE in pressure accumulation chamber, throttling is played to the fuel oil for flowing to fuel injector high-pressure oil pipe from pressure accumulation chamber Circulating fuel injection quantity fluctuation is reduced, further more accurately to reduce the pressure oscillation of fuel injector intermediate fuel oil with the effect of filtering Control high-pressure common-rail fuel system multi-injection process.5, fluid power compensating piston can play during control chamber oil return The effect of repairing into control chamber slows down control chamber oil pressure decrease speed, plays bleed off circuit during control chamber builds pressure Control chamber voltage built-up rate is accelerated in effect, so that rule anxious after first delaying is presented in fuel injection characteristic curve.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is supercharger control valve partial schematic diagram；
Fig. 3 is three-level piston component schematic diagram；
Fig. 4 is injector control valve partial schematic diagram；
Fig. 5 is needle-valve portion schematic diagram；
Fig. 6 is fluid power compensating piston partial schematic diagram.
Specific embodiment
It illustrates with reference to the accompanying drawing and the present invention is described in more detail:
In conjunction with Fig. 1-6, the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic of the present invention, it by fastening cap 1, pressure accumulation cavity wall 2, Pressurization control valve portion 3, three-level piston component 4, Injection Control valve portion 5, needle-valve portion 6, oil injector body 8, pressure accumulation chamber 9 and filter Wave hole plate 10 forms.Pressurization control valve portion 3 is mainly by two-stage electromagnetic iron coil 12 and second level armature 13, level-one electromagnet coil 14 limit orifice plate with level-one armature 15, charged piston limit orifice plate 19, bacterium shape sleeve 22, bacterium shape sleeve spring 21, dual-coil electromagnetic valve 25, supercharger control valve valve rod 27, level-one armature fixed spring 26 and supercharger control valve valve rod reset spring 28 form, pressurization control 27 head of valve valve rod processed is provided with T-type way to cycle oil 17, and 22 sets of bacterium shape sleeve, on 27 head of supercharger control valve valve rod, pass through opposite fortune Dynamic cutting and the lateral oil circuit of opening T-type way to cycle oil 17, the longitudinal oil circuit of T-type way to cycle oil 17 are connected with low pressure oil leak hole 20, Supercharger control valve valve chamber 23 is communicated with level-one Pressure Increasing Oil-Line 18, two-stage supercharging oil circuit 16 and pressurization throttle orifice 24, bacterium shape sleeve 22 In supercharger control valve valve chamber 23.Three-level piston component 4 mainly includes charged piston 35, piston return spring 32 and check valve 34, charged piston 35 is three-level step frustum cone structure, and charged piston 35 and oil injector body 8 constitute level-one booster cavity 29, second level Booster cavity 30 and three-level booster cavity 31, level-one booster cavity 29 are connected with level-one Pressure Increasing Oil-Line 18, two-stage supercharging chamber 30 and second level Pressure Increasing Oil-Line 16 is connected, and three-level booster cavity 31 is connected with oil holding slot 51, and is connected by check valve 34 with high-pressure oil passage. It is machined with low pressure oil leak hole 39 in injector control valve valve rod 38, is connected with electromagnetism valve chamber, electromagnetism valve chamber is connected with low-pressure reservoir It is logical.Needle-valve portion 6 include check-valves 54, fluid power compensating piston 55, fluid power compensating piston spring 59, control chamber 46, oil holding slot 51, Spray orifice 50, needle-valve 48 and needle-valve reset spring 47.Fluid power compensating piston part 53 is mounted on the top of needle-valve portion 6, needle-valve limit Fluid power compensating piston epicoele 61, fluid power compensating piston cavity of resorption 60 and fluid power compensating piston draining chamber 58, liquid are equipped in the orifice plate 52 of position 61 top of force compensating piston upper chamber is provided with to be connected to high-pressure oil passage, fluid power compensating piston cavity of resorption 60 respectively with fluid power compensating piston In-line 56 is connected to fluid power compensating piston vent line 57, is equipped with check-valves 54 in fluid power compensating piston in-line 56.
Fig. 1 is the overall structure diagram for the pressure-accumulating type electronic control fuel injection device that fuel injection characteristic of the present invention can be changed, mainly by fastening Cap 1, pressure accumulation cavity wall 2, pressurization control valve portion 3, three-level piston component 4, Injection Control valve portion 5, needle-valve portion 6, fuel injector Body 8 and filtering orifice plate 10 form.Pressurization control valve portion 3 is linked closely by screw thread and is fixed on oil injector body 8 by fastening cap 1, Injection Control valve portion 5 and needle-valve portion 6 are pressed together and linked closely by screw thread by pressure accumulation cavity wall 2 is fixed on oil injector body 8 On, fastening cap 1 is closed pressure accumulation chamber 9 by screw thread, while fuel feed hole 14 is machined on fastening cap 1 for high pressure oil to be introduced into Pressure accumulation chamber 9.Injection Control valve portion 5 and needle-valve portion 6 are pressed together and linked closely by screw thread by the tight cap 7 of nozzle is fixed on spray On oily body 8.
Fig. 2 is the pressurization control valve portion 3 for the pressure-accumulating type electronic control fuel injection device that fuel injection characteristic can be changed, pressurization control valve portion 3 It mainly include two-stage electromagnetic iron coil 12, two-stage electromagnetic valve 13, level-one electromagnet coil 14, level-one armature 15, charged piston limit Position orifice plate 19, bacterium shape sleeve 22, bacterium shape sleeve spring 21, dual-coil electromagnetic valve limit orifice plate 25, supercharger control valve valve rod 27, level-one rank Ferropexy spring 26 and supercharger control valve valve rod reset spring 28.Level-one electromagnet coil 14 and two-stage electromagnetic iron coil 12 are folded It places and sets, wherein two-stage electromagnetic iron coil 12 is located at the top of level-one electromagnet coil 14.Dual-coil electromagnetic valve limits orifice plate 25 and increases It presses piston limit orifice plate 19 to form supercharger control valve valve chamber 23, is machined with pressurization 24 He of throttle orifice on dual-coil electromagnetic valve limit orifice plate 25 Two-stage supercharging oil circuit 16, the one end for being pressurized throttle orifice 24 and two-stage supercharging oil circuit 16 are all connected with supercharger control valve valve chamber 23, Pressurization 24 other end of throttle orifice is connected with high-pressure oil passage, and high pressure oil is introduced supercharger control valve valve chamber 23.Charged piston limit Be machined with low pressure oil leak hole 20 and level-one Pressure Increasing Oil-Line 18 on orifice plate 25, low pressure oil leak hole 20 and level-one Pressure Increasing Oil-Line 18 all with increasing Pressure control valve valve chamber 23 is connected, and low pressure oil leak hole 20 is connected to low-pressure reservoir.Bacterium shape sleeve 22 is placed on supercharger control valve valve In chamber 23, bacterium shape sleeve 22 is by 21 pressing sleeve of bacterium shape sleeve spring in the head of supercharger control valve valve rod 27, supercharger control valve valve Bar 27 can slide up and down in bacterium shape sleeve 22.27 head of supercharger control valve valve rod is machined with T-type way to cycle oil 17, and T-type returns The vertical access of oily access 17 is connected with the access of bacterium shape sleeve 22, is pressed on supercharger control valve valve rod 27 in bacterium shape sleeve 22 When upper, the cross walkway of T-type way to cycle oil 17 is to close, when supercharger control valve valve rod 27 is moved up with respect to bacterium shape sleeve 22 When, T-type way to cycle oil 17 is opened.Supercharger control valve valve rod reset spring 28 presses supercharger control valve valve rod 27 and bacterium shape sleeve 22 Tightly on charged piston limit orifice plate 19, and low pressure oil leak hole 20 is closed.Supercharger control valve valve rod 27 passes through level-one electromagnet Hole and dual-coil electromagnetic valve among coil 14 limit orifice plate 25, level-one electromagnet coil 14 and dual-coil electromagnetic valve limit orifice plate 25 it Between be placed with level-one armature 15, supercharger control valve valve rod 27 passes through 15 center of level-one armature, and level-one armature spring 26 holds in the mouth level-one Iron 15 is fixed on supercharger control valve valve rod 27, and magneticaction of the level-one armature 15 by level-one electromagnet coil 14 works as level-one When armature 15 is attracted, supercharger control valve valve rod 27 can be detached from level-one armature 15 and move upwards.Second level armature 13 is placed in increasing 27 top of pressure control valve valve rod, and connect with supercharger control valve valve rod 27, second level armature 13 can be by two-stage electromagnetic iron coil 12 electromagnetic force.
Fig. 3 show the structural schematic diagram of the three-level piston component 4 of the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic, packet Include charged piston 35, oil injector body 8, piston return spring 32 and check valve 34.Charged piston 35 is a three-level stepped cylinder Structure collectively forms plunger shaft 36 with charged piston limit orifice plate 19, and high pressure oil is logical by the hole opened on piston limit orifice plate 19 Enter plunger shaft 36.Charged piston 35 and oil injector body 8 collectively form level-one booster cavity 29, two-stage supercharging chamber 30 and three-level booster cavity 31, wherein level-one booster cavity 29 and two-stage supercharging chamber 30 are connected with level-one Pressure Increasing Oil-Line 18 and two-stage supercharging oil circuit 16 respectively, High pressure oil in supercharger control valve valve chamber 23 respectively enters level-one pressurization by level-one Pressure Increasing Oil-Line 18 and two-stage supercharging oil circuit 16 Chamber 27 and two-stage supercharging chamber 28.Three-level booster cavity 31 is connected by check valve 34 with high-pressure oil passage, is put in three-level booster cavity 31 It is equipped with piston return spring 32, while 31 lower part of three-level booster cavity is also provided with Pressure Increasing Oil-Line 33, three-level is pressurized by Pressure Increasing Oil-Line 33 Oil in chamber 31 is introduced into oil holding slot 51.
Fig. 4 show the structural schematic diagram of the Injection Control valve portion 5 of the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic, It is limited including electromagnet 34, injector control valve valve rod 38, armature 43, injector control valve valve rod return spring 45 and injector control valve Orifice plate 44.Injector control valve limit orifice plate 44 and intermediate orifice plate 4641 collectively form injector control valve valve chamber 40, injector control valve 38 lower end of valve rod is a bacterium shape structure, is located in injector control valve valve chamber 40.It is machined among injector control valve valve rod 38 low Oil leak hole 39 is pressed, injector control valve valve rod 38 is pressed on intermediate orifice plate 41 by injector control valve valve rod return spring 45, will be low Oil leak hole 39 is pressed to close.High-pressure oil passage is provided with towards injector control valve valve chamber 40, same hour hands in injector control valve limit orifice plate 44 It is also provided with oil inlet metering-orifice 42 on valve limit orifice plate, 42 one end of oil inlet metering-orifice is connected to injector control valve valve chamber 40, the other end and control Chamber 46 processed is connected to, and high pressure oil is introduced into control chamber 46.
Fig. 5 show the structural schematic diagram of the needle-valve portion 6 of the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic, including needle Valve 48, needle valve spring 47, fluid power compensating piston part 53 and nozzle 49.Fluid power compensating piston part 53 is as shown in fig. 6, include liquid Force compensating piston 55 and fluid power compensating piston spring 59.Fluid power compensating piston part 53 is located in needle-valve limit orifice plate 52, with needle Valve limits orifice plate 52 and forms fluid power compensating piston cavity of resorption 60 and fluid power compensating piston draining chamber 58, while being formed with intermediate orifice plate 41 Fluid power compensating piston epicoele 61, needle valve spring 47 are located in fluid power compensating piston cavity of resorption 60.Fluid power compensating piston epicoele 61 and height Pressure oil road is connected, and fluid power compensating piston cavity of resorption 60 is gone out by fluid power compensating piston in-line 56 and fluid power compensating piston respectively Oil circuit 57 is connected with injector control valve valve chamber 40 and control chamber 46, is wherein provided with non-return in fluid power compensating piston in-line 56 Valve 54.Nozzle 49 is located in control chamber 46 with needle-valve limit orifice plate 52 composition control chamber 46 and oil holding slot 51, needle valve spring 47.Spray 49 lower end of mouth is provided with spray orifice 50, when the resultant force of the pressure initiation in 47 elastic force of needle valve spring and control chamber 46 is right greater than oil holding slot 51 When the pressure that needle-valve 48 applies, needle-valve 48, which is taken a seat, closes spray orifice 50；When needle-valve 48 lifts, spray orifice 50 and oil holding slot 51 connect It is logical, commencement of fuel injection.
Fuel oil enters pressure accumulation chamber 9 from fuel inlet 11, and filtering orifice plate 10, pressure accumulation chamber 9 are horizontally arranged in pressure accumulation chamber 9 Positioned at fuel injection characteristic can be changed pressure-accumulating type electronic control fuel injection device the top, respectively with fuel inlet 11 and lower section high-pressure oil passage phase Even, high-pressure oil passage draws a branch at dual-coil electromagnetic valve limit orifice plate 25, enters pressurization control by being pressurized throttle orifice 24 In valve valve chamber 23, it is divided into two-way using supercharger control valve valve chamber 23, level-one is entered by level-one Pressure Increasing Oil-Line 18 all the way and is pressurized Chamber 29, another way enter two-stage supercharging chamber 30 by two-stage supercharging oil circuit 16.Fuel oil continues down in charged piston limit hole A branch is drawn at plate 19, this branch leads to plunger shaft 36.Fuel oil is divided into two in the continuation of oil injector body 8 down and wherein Road: continuing to enter injector control valve valve chamber 40 by the high-pressure oil passage in injector control valve limit orifice plate 44 down all the way, then Enter control chamber 46 by oil inlet metering-orifice 42；Another way is entered in three-level booster cavity 31 by check valve 34, is passed through still further below Pressure Increasing Oil-Line 33 enters in oil holding slot 51.The hydraulic coupling in plunger shaft 36 is less than level-one booster cavity 29, two-stage supercharging chamber at this time 30 and the hydraulic coupling in three-level booster cavity 31 and piston return spring 32 the resultant force that is formed of elastic force, charged piston 35 is in most High position, therefore the fuel oil in three-level booster cavity 31 is not pressurized.Pressure in oil holding slot 51 and the formation of needle valve spring 47 simultaneously Resultant force be greater than control chamber 46 in pressure, needle-valve 48 is taken a seat at this time.According to the difference of injection process, the variable storage of fuel injection characteristic Pressure type electric-controlled fuel injector can be divided into three kinds of different operating modes: without boost mode, low pressure charging mode and high pressure-charging mode.
When the pressure-accumulating type electronic control fuel injection device that fuel injection characteristic can be changed works under no boost mode, pressurization control valve portion 3 No power, due to the pressure balance of each acting surface of three-level piston at this time, check valve 34 is opened, therefore in three-level booster cavity 31 Fuel pressure does not increase, and the fuel pressure in oil holding slot 51 is equal to the pressure of check valve another side.When Injection Control valve portion 5 When energization, electromagnet 37 attracts armature 43, and armature 43 drives injector control valve valve rod 38 to move upwards thus simultaneously by conical surface seal Low pressure oil leak hole 39 is opened, the fuel oil in control chamber 46 enters electricity by the low pressure oil leak hole 39 in injector control valve valve rod 38 Magnet valve chamber returns in low-pressure reservoir using the low pressure oil way being arranged in electromagnetism valve chamber, thus the pressure in control chamber 46 It reduces, while the pressure of fluid power compensating piston cavity of resorption 60 decreases in fluid power compensating piston part 53, on fluid power compensating piston The pressure of chamber 61 is greater than the resultant force of the elastic force formation of 60 pressure of fluid power compensating piston cavity of resorption and fluid power compensating piston spring 58, at this time Fluid power compensating piston 55 moves downward, check-valves 54 close, fluid power compensating piston 55 by fluid power compensating piston vent line 57 to 46 repairing of control chamber slows down 46 pressure decrease speed of control chamber.When the elastic force of pressure and needle valve spring 47 in control chamber 46 When the resultant force of formation is less than the upward hydraulic coupling of fuel oil in oil holding slot 51, needle-valve 48 is lifted up, and spray orifice 50 is opened, fuel injection characteristic Variable pressure-accumulating type electronic control fuel injection device commencement of fuel injection.When Injection Control valve portion 5 powers off, injector control valve valve rod 38 is in oil spout It takes a seat under the elastic force effect of control valve valve rod return spring 45, opens high-pressure oil passage while closing low pressure oil leak hole 39, Check-valves 54 is opened, and control chamber 46 builds pressure by oil inlet metering-orifice 42 and fluid power compensating piston cavity of resorption 60 again, when in control chamber 46 Pressure and the resultant force that is formed of elastic force of needle valve spring 47 when being greater than the upward hydraulic coupling of fuel oil in oil holding slot 51, needle-valve 48 is again It takes a seat, the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic stops oil spout.
When the pressure-accumulating type electronic control fuel injection device that fuel injection characteristic can be changed works under low pressure charging mode, pressurization control valve portion 3 Level-one electromagnet coil 14 be powered, level-one electromagnet attract level-one armature 15, level-one armature 15 drive supercharger control valve valve rod 27 move upward to level-one electromagnet spacing place.Bacterium shape sleeve 22 is under the action of bacterium shape 21 spring force of sleeve spring with pressurization Control valve valve rod 27 is lifted up, and low pressure oil leak hole 20 is opened, until by the conical surface seal of the top of bacterium shape sleeve 22.Level-one increases Fuel oil in pressure chamber 29 flows through low pressure oil leak hole 20 by level-one Pressure Increasing Oil-Line 18 and returns in low-pressure reservoir, at this time level-one booster cavity Pressure reduction in 29, the pressure in plunger shaft 36 are greater than in level-one booster cavity 29, two-stage supercharging chamber 30 and three-level booster cavity 31 Pressure and piston return spring 32 the sum of elastic force, charged piston 35 moves downward, at the oil inlet of three-level booster cavity 31 Check valve 34 is closed, and the fuel pressure in three-level booster cavity 31, which is pressurized, to be increased, and then leads to the fuel pressure liter in oil holding slot 51 It is high.3 partial current of subsequent injector control valve, electromagnet 37 attract armature 43, and armature 43 drives injector control valve valve rod 38 upward To by conical surface seal and open low pressure oil leak hole 39, the fuel oil in control chamber 46 flows back to low pressure by low pressure oil leak hole 39 for movement In fuel tank.Pressure reduction in control chamber 46 at this time, while fluid power compensating piston cavity of resorption 60 in fluid power compensating piston part 53 Pressure decreases, and the pressure of fluid power compensating piston epicoele 61 is greater than 60 pressure of fluid power compensating piston cavity of resorption and fluid power compensating piston The resultant force that the elastic force of spring 58 is formed, fluid power compensating piston 55 moves downward at this time, and check-valves 54 is closed, fluid power compensating piston 55 By fluid power compensating piston vent line 57 to 46 repairing of control chamber, slow down 46 pressure decrease speed of control chamber.When its pressure with When the resultant force of needle valve spring 47 is less than that fuel oil is to the hydraulic coupling of needle-valve 48 in oil holding slot 51, needle-valve 48 is lifted up, and spray orifice 50 is beaten It opens, the variable pressure-accumulating type electronic control fuel injection device commencement of fuel injection of fuel injection characteristic.When Injection Control valve portion 5 powers off, injector control valve Valve rod 38 is taken a seat under the elastic force effect of injector control valve valve rod return spring 45, is beaten while closing low pressure oil leak hole 39 High-pressure oil passage is opened, check-valves is opened, and control chamber 46 builds pressure by oil inlet metering-orifice 42 and fluid power compensating piston cavity of resorption 60 again, works as control When the resultant force that the elastic force of pressure and needle valve spring 47 in chamber 46 processed is formed is greater than the upward hydraulic coupling of fuel oil in oil holding slot 51, needle Valve 48 drops back into one's seat, and the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic stops oil spout.When pressurization control valve portion 3 powers off, Supercharger control valve valve rod 27 drives bacterium shape sleeve 22 to take a seat together under the spring-force driven dual of supercharger control valve reset spring 28, The conical surface seal of 22 upper end of bacterium shape sleeve is opened while low pressure oil leak hole 20 is closed, high pressure fuel passes through level-one Pressure Increasing Oil-Line 18 reenter level-one booster cavity 29, and the pressure in plunger shaft 36 is less than level-one booster cavity 29, two-stage supercharging chamber 30 and three at this time The sum of the elastic force of pressure and piston return spring 32 in grade booster cavity 31, charged piston 35 is back up into initial position.Three-level Pressure reduction in booster cavity 31, check valve 34 are again turned on, and fuel oil is entered in three-level booster cavity 32 again by check valve 34 Enter oil holding slot 51.
When the pressure-accumulating type electronic control fuel injection device that fuel injection characteristic can be changed works under high pressure-charging mode, pressurization control valve portion first 3 level-one electromagnet coil 14 is divided to be powered, level-one electromagnet attracts level-one armature 15, and level-one armature 15 drives supercharger control valve valve Bar 27 moves upward to level-one electromagnet spacing place.Bacterium shape sleeve 22 is under the action of bacterium shape 21 spring force of sleeve spring with increasing Pressure control valve valve rod 27 is lifted up, and opens low pressure oil leak hole 20 while by the conical surface seal of the top of bacterium shape sleeve 22. The fuel oil in level-one booster cavity 29 flows through low pressure oil leak hole 20 by level-one Pressure Increasing Oil-Line 18 and returns in low-pressure reservoir at this time, level-one 29 pressure reduction of booster cavity.Then the two-stage electromagnetic iron coil 12 of pressurization control valve portion 3 is powered, and two-stage electromagnetic iron attracts second level Armature 13, then second level armature 13 drives supercharger control valve valve rod 27 to be detached from level-one armature 15 and continues up second level armature Spacing place.Supercharger control valve valve rod 27 is detached from the continuation of bacterium shape sleeve 22 and up moves at this time, T-type way to cycle oil 17 is opened, two Fuel oil in grade booster cavity 30 is flow back by the T-type way to cycle oil 17 in bacterium shape sleeve 22 low again by two-stage supercharging oil circuit 16 In pressure oil case, 30 pressure of two-stage supercharging chamber also declines.The pressure in plunger shaft 36 is greater than level-one booster cavity 29, second level at this time The resultant force that the elastic force of pressure and charged piston return spring 32 in booster cavity 30 and three-level booster cavity 31 is formed, charged piston 35 It moving downward, the check valve 34 at the oil inlet of three-level booster cavity 31 is closed, and the fuel pressure in three-level booster cavity 31 increases, into And the fuel pressure in oil holding slot 51 is caused to increase.Then Injection Control valve portion 5 is powered, and electromagnet 37 attracts armature 43, rank Iron 43 drives Injection Control valve rod 38 to move upwards by conical surface seal and to open low pressure oil leak hole 39, the combustion in control chamber 46 Oil is flowed back in low-pressure reservoir by low pressure oil leak hole 39.Pressure reduction in control chamber 46 at this time, while fluid power compensating piston portion The pressure of fluid power compensating piston cavity of resorption 60 in 53 is divided to decrease, the pressure of fluid power compensating piston epicoele 61 is greater than fluid power compensation and lives The resultant force of the elastic force formation of 60 pressure of cavity of resorption and fluid power compensating piston spring 58 is filled in, fluid power compensating piston 55 moves downward at this time, Check-valves 54 is closed, and fluid power compensating piston 55, to 46 repairing of control chamber, makes control chamber 46 by fluid power compensating piston vent line 57 Pressure decrease speed slows down.When the resultant force of its pressure and needle valve spring 47 is less than in oil holding slot 51 fuel oil to the hydraulic coupling of 48 valve of needle When, needle-valve 48 is lifted up, and spray orifice 50 is opened, the variable pressure-accumulating type electronic control fuel injection device commencement of fuel injection of fuel injection characteristic.When oil spout control When valve portion 5 processed powers off, injector control valve valve rod 38 is taken a seat under the elastic force effect of injector control valve valve rod return spring 45, High-pressure oil passage is opened while low pressure oil leak hole 39 is closed, check-valves 54 is opened, and control chamber 46 passes through oil inlet metering-orifice 42 and liquid Force compensating piston cavity of resorption 60 builds the newly-built pressure of ballast again, when the conjunction that the elastic force of pressure and needle valve spring 47 in control chamber 46 is formed When power is greater than the upward hydraulic coupling of fuel oil in oil holding slot 51, needle-valve 48 drops back into one's seat, the variable automatically controlled spray of pressure accumulation type of fuel injection characteristic Oily device stops oil spout.When pressurization control valve portion 3 powers off, supercharger control valve valve rod 27 is in supercharger control valve reset spring 28 It drives bacterium shape sleeve 21 to take a seat together under spring-force driven dual, first closes the lateral oil circuit of T-type way to cycle oil 17, then by low pressure The conical surface seal of 22 upper end of bacterium shape sleeve is opened while oil leak hole 20 is closed, high pressure fuel passes through level-one Pressure Increasing Oil-Line 18 and two Grade Pressure Increasing Oil-Line 16 reenters level-one booster cavity 29 and two-stage supercharging chamber 30, and the pressure in plunger shaft 36 increases less than level-one at this time Press the sum of the elastic force of the pressure and charged piston return spring 32 in chamber 29, two-stage supercharging chamber 30 and three-level booster cavity 31, pressurization Piston 35 is back up into initial position.Pressure reduction in three-level booster cavity 31, check valve 34 are again turned on, and fuel oil passes through unidirectional Valve 34 enters in three-level booster cavity 31 and enters back into oil holding slot 51.
The course of work for the pressure-accumulating type electronic control fuel injection device that can be changed by fuel injection characteristic is it is found that the present invention passes through during the work time Change the action response of supercharger control valve, it can be achieved that different pressure ratios enables fuel injector to reach different injection pressures Realize more flexible injection characteristics.Simultaneously present invention employs the injector control valve of electromagnetic type, which further improves oil spouts The response speed and control precision of device, make multi-injection working method is implemented as possibility.Effectively increase diesel engine The economy of dynamic property and fuel oil.Way to cycle oil is set in injector control valve valve rod, oil return circuit is arranged in Injection Control In valve, play the role of cooling solenoid valve, improves the reliability of the present invention at work.Pressure accumulation chamber can effectively extenuate combustion Caused pressure oscillation when oil spurts, is conducive to the accurate control to distributive value, and the pressure stabilization function of pressure accumulation chamber can make diesel engine The size of common rail pipe reduces, this advantageously reduces requirement of the common rail pipe to material, improves its service life.Meanwhile in pressure accumulation chamber It is provided with AND DEWATERING FOR ORIFICE STRUCTURE, the throttle orifice of different pore size is drilled on orifice plate, the combustion to fuel injector high-pressure oil pipe is flowed to from pressure accumulation chamber Oil plays the role of throttling and filtering, to reduce the pressure oscillation of fuel injector intermediate fuel oil, circulating fuel injection quantity fluctuation is reduced, into one Step more accurately controls high-pressure common-rail fuel system multi-injection process.The fluid power compensating piston structure of use is in control chamber pressure release When repairing, play the role of two-way oil inlet when building pressure, so that fuel injection characteristic realizes characteristic anxious after first delaying, improve oil spout Energy.

Claims (9)

1. the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic, it is characterized in that: including oil injector body, pressure accumulation cavity wall, pressurization control Valve portion, three-level piston component, Injection Control valve portion, needle-valve portion, pressurization control valve portion and three-level piston are from top to bottom It is mounted in oil injector body, Injection Control valve portion and needle-valve portion are arranged in from top to bottom in the tight cap of nozzle, and tight cap of spraying nozzle is solid It is scheduled below oil injector body, pressure accumulation cavity wall is fixed on supercharger control valve upper, and pressure accumulation chamber and high pressure is arranged in pressure accumulation cavity wall Oil circuit, pressure accumulation chamber are connected to high-pressure oil passage；
The pressurization control valve portion includes supercharger control valve upper valve base, supercharger control valve centre valve seat, dual-coil electromagnetic valve limit hole Plate, charged piston limit orifice plate, supercharger control valve valve rod, level-one armature, second level armature, bacterium shape sleeve, supercharger control valve upper valve Valve seat, dual-coil electromagnetic valve limit orifice plate and charged piston limit orifice plate are arranged from top to bottom among seat, supercharger control valve, pressurization control The head of valve valve rod is located to be limited in the supercharger control valve valve chamber that orifice plate and charged piston limit orifice plate are constituted by dual-coil electromagnetic valve, Outside is bacterium shape sleeve, and second level armature is installed in the tail portion of supercharger control valve valve rod, and level-one is installed at the middle part of supercharger control valve valve rod Armature, second level armature are located among supercharger control valve in valve seat, and level-one armature is located in dual-coil electromagnetic valve limit orifice plate, pressurization control Two-stage electromagnetic iron coil is wound in valve upper valve base, winds level-one electromagnet coil, pressurization control among supercharger control valve in valve seat Supercharger control valve valve rod reset spring, supercharger control valve are set between valve valve rod tail portion and supercharger control valve upper valve base above it The part that valve rod is located at below level-one armature is cased with level-one armature fixed spring, the extension of bacterium shape sleeve and the pressurization of lower section Bacterium shape sleeve spring is set between piston limit orifice plate, and the head of supercharger control valve valve rod is machined with T-type way to cycle oil, and T-type returns Oily access includes the vertical access communicated and cross walkway, and dual-coil electromagnetic valve limits setting pressurization throttle orifice, two-stage supercharging on orifice plate Oil circuit, charged piston, which limits, is arranged level-one Pressure Increasing Oil-Line and low pressure oil leak hole on orifice plate, pressurization throttle orifice, two-stage supercharging oil circuit, Level-one Pressure Increasing Oil-Line is connected to supercharger control valve valve chamber with low pressure oil leak hole, is pressurized the other end connection high-pressure oil passage of throttle orifice, Low pressure oil leak hole is connected to fuel tank；
The three-level piston component includes charged piston, piston return spring, and charged piston is three-level stepped cylinder structure, from upper And lower is respectively the first-third cylinder, and diameter successively decreases, the first cylinder and the charged piston above it are limited and are formed between orifice plate Plunger shaft, plunger shaft limit the hole in orifice plate by charged piston and are connected to high-pressure oil passage, the first cylinder and the second cylinder and oil spout Level-one booster cavity is formed between body, and two-stage supercharging chamber, third column are formed between the second cylinder and third cylinder and oil injector body Three-level booster cavity is formed between body and oil injector body below, and piston return spring, level-one pressurization are installed in three-level booster cavity Chamber is connected to level-one Pressure Increasing Oil-Line, and two-stage supercharging chamber is connected to two-stage supercharging oil circuit, and three-level booster cavity is connected to high pressure oil by check valve Road, three-level booster cavity lower part are provided with Pressure Increasing Oil-Line；
The Injection Control valve portion includes injector control valve upper valve base, injector control valve limit orifice plate, intermediate orifice plate, oil spout control Valve valve rod processed, armature, injector control valve upper valve base, injector control valve limit orifice plate and intermediate orifice plate are arranged from top to bottom, oil spout The setting of control valve valve rod limits in orifice plate in injector control valve, and armature is installed on the top of injector control valve valve rod, armature with thereon Injector control valve valve rod return spring is installed, outside injector control valve valve rod return spring between the injector control valve upper valve base of side Injector control valve upper valve base in wind electromagnet coil, low pressure oil leak hole, injector control valve are set in injector control valve valve rod It limits orifice plate and intermediate orifice plate constitutes injector control valve valve chamber, injector control valve stem lower portion includes tapered protrusion, Injection Control Valve, which limits, is arranged injector control valve in-line on orifice plate, injector control valve in-line is connected to high-pressure oil passage, is arranged on intermediate orifice plate Oil inlet metering-orifice, oil inlet metering-orifice are connected to injector control valve valve chamber；
The needle-valve portion includes needle-valve limit orifice plate, needle-valve block, needle-valve limit orifice plate and during needle-valve block is arranged in from top to bottom Between below orifice plate, fluid power compensating piston epicoele in-line, non-return passage are set in intermediate orifice plate, non-return is installed in non-return passage Valve, fluid power compensating piston epicoele in-line are connected to high-pressure oil passage, and non-return passage is connected to oil inlet metering-orifice, is arranged in needle-valve limit orifice plate Fluid power compensating piston, control chamber oil circuit are cased with fluid power compensating piston reset spring, fluid power compensating piston outside fluid power compensating piston The upper end of reset spring is withstood on fluid power compensating piston, and the lower end of fluid power compensating piston reset spring withstands on the limit of needle-valve below On the orifice plate of position, the fluid power compensating piston epicoele communicated with fluid power compensating piston epicoele in-line is formed above fluid power compensating piston, Fluid power compensating piston reset spring present position is fluid power compensating piston cavity of resorption, fluid power compensating piston lower end and needle-valve below It limits and forms fluid power compensating piston draining chamber, control chamber oil communication oil inlet metering-orifice between orifice plate；Needle-valve, needle are installed in needle-valve block Valve top is cased with needle-valve reset spring, and the upper end of needle-valve reset spring is withstood on needle-valve limit orifice plate, under needle-valve reset spring End is withstood on needle-valve, and needle-valve reset spring present position is control chamber, and control chamber is connected to control chamber oil circuit, is arranged in needle-valve block and contains Oil groove in-line forms oil holding slot between needle-valve and needle-valve block, spray orifice is arranged in needle-valve block bottom, and oil holding slot in-line is respectively communicated with Oil holding slot and Pressure Increasing Oil-Line, fluid power compensating piston cavity of resorption are connected to the non-return below check-valves by fluid power compensating piston in-line and lead to Road, fluid power compensating piston cavity of resorption are connected to control chamber by fluid power compensating piston vent line.
2. the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic according to claim 1, it is characterized in that: without boost mode Under, pressurization control valve portion no power, check valve is opened；When injector control valve partial current, electromagnet attracts armature, armature Injector control valve valve rod is driven to move upwards by conical surface seal and to open low pressure oil leak hole, the fuel oil in control chamber passes through spray Low pressure oil leak hole in oil control valve valve rod enters electromagnetism valve chamber, returns using the low pressure oil way being arranged in electromagnetism valve chamber Into low-pressure reservoir, fluid power compensating piston is moved downward, closure of check ring, and fluid power compensating piston is fuel-displaced by fluid power compensating piston Road direction control chamber repairing, when the resultant force that the elastic force of pressure and needle valve spring in control chamber is formed is upward less than fuel oil in oil holding slot Hydraulic coupling when, needle-valve is lifted up, spray orifice open；When the power-off of Injection Control valve portion, injector control valve valve rod is in oil spout It takes a seat under the elastic force effect of control valve valve rod return spring, opens high-pressure oil passage, non-return while by low pressure draining bore closure Valve is opened, and control chamber builds pressure by oil inlet metering-orifice and fluid power compensating piston cavity of resorption again, when the pressure and needle-valve bullet in control chamber When the resultant force that the elastic force of spring is formed is greater than the upward hydraulic coupling of fuel oil in oil holding slot, needle-valve drops back into one's seat.
3. the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic according to claim 1 or 2, it is characterized in that: low pressure charging mould Under formula, the level-one electromagnet coil power of pressurization control valve portion, level-one electromagnet attracts level-one armature, and level-one armature, which drives, to be increased Pressure control valve valve rod moves upward to level-one electromagnet spacing place；Bacterium shape sleeve is under the action of bacterium shape sleeve spring power with increasing Pressure control valve valve rod is lifted up, and low pressure oil leak hole is opened, until by the conical surface seal above bacterium shape sleeve.Level-one booster cavity Interior fuel oil flows through low pressure oil leak hole by level-one Pressure Increasing Oil-Line and returns in low-pressure reservoir, and charged piston moves downward, and three-level increases Press the closed check valve at the oil inlet of chamber；Subsequent injector control valve partial current, electromagnet attract armature, and armature drives oil spout Control valve valve rod moves upwards by conical surface seal and to open low pressure oil leak hole, and the fuel oil in control chamber passes through low pressure oil leak hole It flows back in low-pressure reservoir, fluid power compensating piston moves downward, closure of check ring, and fluid power compensating piston is gone out by fluid power compensating piston Oil circuit is to control chamber repairing, when the resultant force of control cavity pressure and needle valve spring is less than in oil holding slot fuel oil to the hydraulic coupling of needle-valve When, needle-valve is lifted up, and spray orifice is opened；When the power-off of Injection Control valve portion, injector control valve valve rod is in injector control valve valve It takes a seat under the elastic force effect of bar return spring, high-pressure oil passage is opened while by low pressure draining bore closure, check-valves is opened, control Chamber processed builds pressure by oil inlet metering-orifice and fluid power compensating piston cavity of resorption again, when the elastic force shape of pressure and needle valve spring in control chamber At resultant force be greater than the upward hydraulic coupling of fuel oil in oil holding slot when, needle-valve drops back into one's seat；When the power-off of pressurization control valve portion, increase Pressure control valve valve rod drives bacterium shape sleeve to take a seat together under the spring-force driven dual of supercharger control valve reset spring, lets out by low pressure The conical surface seal of bacterium shape sleeve upper end is opened while oilhole is closed, high pressure fuel reenters level-one by level-one Pressure Increasing Oil-Line Booster cavity, charged piston are again turned on back up into initial position, check valve, and fuel oil enters three-level booster cavity by check valve Inside enter back into oil holding slot.
4. the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic according to claim 1 or 2, it is characterized in that: high pressure-charging mould Under formula, the level-one electromagnet coil power of pressurization control valve portion, level-one electromagnet attract level-one armature, level-one armature band first Dynamic supercharger control valve valve rod moves upward to level-one electromagnet spacing place；Bacterium shape sleeve under the action of bacterium shape sleeve spring power with Supercharger control valve valve rod be lifted up, open low pressure oil leak hole while by conical surface seal above bacterium shape sleeve；This When level-one booster cavity in fuel oil low pressure oil leak hole flowed through by level-one Pressure Increasing Oil-Line return in low-pressure reservoir, then pressurization control The two-stage electromagnetic iron coil of valve portion is powered, and two-stage electromagnetic iron attracts second level armature, and then second level armature drives supercharger control valve Valve rod is detached from level-one armature and continues up at second level limiting position of armature；Supercharger control valve valve rod disengaging bacterium shape sleeve continues past T-type way to cycle oil is opened in upper movement, and the intracavitary fuel oil of two-stage supercharging is passed through in bacterium shape sleeve again by two-stage supercharging oil circuit T-type way to cycle oil is flow back into low-pressure reservoir, and charged piston moves downward, and the check valve at the oil inlet of three-level booster cavity closes It closes；Then injector control valve partial current, electromagnet attract armature, and armature drives Injection Control valve rod to move upwards to bore Face seals and opens low pressure oil leak hole, and the fuel oil in control chamber is flowed back in low-pressure reservoir by low pressure oil leak hole, and fluid power compensation is lived Plug moves downward, closure of check ring, and fluid power compensating piston works as control chamber by the fuel-displaced road direction control chamber repairing of fluid power compensating piston When pressure and the resultant force of needle valve spring are less than the hydraulic coupling of fuel oil in oil holding slot to needle-valve, needle-valve is lifted up, spray orifice oil spout；When When Injection Control valve portion powers off, injector control valve valve rod is taken a seat under the elastic force effect of injector control valve valve rod return spring, High-pressure oil passage is opened while by low pressure draining bore closure, check-valves is opened, and control chamber is compensated by oil inlet metering-orifice and fluid power Piston cavity of resorption builds pressure again, when pressure and needle valve spring in control chamber elastic force formed resultant force be greater than oil holding slot in fuel oil to On hydraulic coupling when, needle-valve drops back into one's seat；When the power-off of pressurization control valve portion, supercharger control valve valve rod is multiple in supercharger control valve It drives bacterium shape sleeve to take a seat together under the spring-force driven dual of position spring, first closes T-type way to cycle oil transverse direction oil circuit, then inciting somebody to action The conical surface seal of bacterium shape sleeve upper end is opened while low pressure draining bore closure, high pressure fuel passes through level-one Pressure Increasing Oil-Line and second level Pressure Increasing Oil-Line reenters level-one booster cavity and two-stage supercharging chamber, and charged piston is beaten again back up into initial position, check valve It opens, fuel oil is entered in three-level booster cavity by check valve and enters back into oil holding slot.
5. the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic according to claim 3, it is characterized in that: high pressure-charging mode Under, the level-one electromagnet coil power of pressurization control valve portion, level-one electromagnet attract level-one armature first, and level-one armature drives Supercharger control valve valve rod moves upward to level-one electromagnet spacing place；Bacterium shape sleeve under the action of bacterium shape sleeve spring power with Supercharger control valve valve rod is lifted up, and opens low pressure oil leak hole while by conical surface seal above bacterium shape sleeve；At this time Fuel oil in level-one booster cavity flows through low pressure oil leak hole by level-one Pressure Increasing Oil-Line and returns in low-pressure reservoir, then supercharger control valve Partial two-stage electromagnetic iron coil is powered, and two-stage electromagnetic iron attracts second level armature, and then second level armature drives supercharger control valve valve Bar is detached from level-one armature and continues up at second level limiting position of armature；Supercharger control valve valve rod, which is detached from bacterium shape sleeve, to be continued up Movement, T-type way to cycle oil is opened, and the intracavitary fuel oil of two-stage supercharging passes through the T in bacterium shape sleeve by two-stage supercharging oil circuit again Type way to cycle oil is flow back into low-pressure reservoir, and charged piston moves downward, the closed check valve at the oil inlet of three-level booster cavity； Then injector control valve partial current, electromagnet attract armature, and armature drives Injection Control valve rod to move upwards thus by the conical surface Low pressure oil leak hole is sealed and opens, the fuel oil in control chamber is flowed back in low-pressure reservoir by low pressure oil leak hole, fluid power compensating piston It moves downward, closure of check ring, fluid power compensating piston is by the fuel-displaced road direction control chamber repairing of fluid power compensating piston, when control chamber pressure When power and the resultant force of needle valve spring are less than the hydraulic coupling of fuel oil in oil holding slot to needle-valve, needle-valve is lifted up, spray orifice oil spout；Work as spray When oil control valve part powers off, injector control valve valve rod is taken a seat under the elastic force effect of injector control valve valve rod return spring, High-pressure oil passage is opened while by low pressure draining bore closure, check-valves is opened, and control chamber is lived by oil inlet metering-orifice and fluid power compensation Plug cavity of resorption builds pressure again, when the resultant force that the elastic force of pressure and needle valve spring in control chamber is formed is upward greater than fuel oil in oil holding slot Hydraulic coupling when, needle-valve drops back into one's seat；When the power-off of pressurization control valve portion, supercharger control valve valve rod is resetted in supercharger control valve It drives bacterium shape sleeve to take a seat together under the spring-force driven dual of spring, first closes T-type way to cycle oil transverse direction oil circuit, then will be low The conical surface seal of bacterium shape sleeve upper end is opened while pressing draining bore closure, high pressure fuel is increased by level-one Pressure Increasing Oil-Line and second level Pressure oil road reenters level-one booster cavity and two-stage supercharging chamber, and charged piston is again turned on back up into initial position, check valve, Fuel oil is entered in three-level booster cavity by check valve and enters back into oil holding slot.
6. the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic according to claim 1 or 2, it is characterized in that: pressurization control At three rib type parts at valve valve rod and the sleeve cooperation of bacterium shape, bacterium shape sleeve lining length is longer than three rib type partial-lengths.
7. the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic according to claim 3, it is characterized in that: supercharger control valve valve At three rib type parts at bar and the sleeve cooperation of bacterium shape, bacterium shape sleeve lining length is longer than three rib type partial-lengths.
8. the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic according to claim 4, it is characterized in that: supercharger control valve valve At three rib type parts at bar and the sleeve cooperation of bacterium shape, bacterium shape sleeve lining length is longer than three rib type partial-lengths.
9. the variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic according to claim 5, it is characterized in that: supercharger control valve valve At three rib type parts at bar and the sleeve cooperation of bacterium shape, bacterium shape sleeve lining length is longer than three rib type partial-lengths.
CN201810833791.4A 2018-07-26 2018-07-26 The variable pressure-accumulating type electronic control fuel injection device of fuel injection characteristic Withdrawn CN109236521A (en)

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Publication number Priority date Publication date Assignee Title
CN111594368A (en) * 2020-04-17 2020-08-28 莆田市宏业精密机械有限公司 Area compensation manufacturing method of pressure balance oil nozzle and pressure balance oil nozzle manufactured by same
US11713740B1 (en) * 2022-02-24 2023-08-01 Harbin Engineering University High-pressure common rail fuel injector capable of achieving highly stable injection based on throttling damping accommodating effect

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Publication number Priority date Publication date Assignee Title
US5954030A (en) * 1994-12-01 1999-09-21 Oded E. Sturman Valve controller systems and methods and fuel injection systems utilizing the same
JP2006161568A (en) * 2004-12-02 2006-06-22 Nippon Soken Inc Control valve and fuel injection valve having the same
WO2013086427A1 (en) * 2011-12-07 2013-06-13 Quantlogic Corporation A fuel injector for multi-fuel injection with pressure intensification and a variable orifice
CN104018969A (en) * 2014-05-29 2014-09-03 哈尔滨工程大学 Piezoelectric control pressure accumulation and stabilization oil sprayer
CN104632485A (en) * 2014-12-29 2015-05-20 沪东重机有限公司 Common-rail fuel oil jet system controlled by double electromagnetic valves and applied to low-speed diesel engine for ship

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Publication number Priority date Publication date Assignee Title
US5954030A (en) * 1994-12-01 1999-09-21 Oded E. Sturman Valve controller systems and methods and fuel injection systems utilizing the same
JP2006161568A (en) * 2004-12-02 2006-06-22 Nippon Soken Inc Control valve and fuel injection valve having the same
WO2013086427A1 (en) * 2011-12-07 2013-06-13 Quantlogic Corporation A fuel injector for multi-fuel injection with pressure intensification and a variable orifice
CN104018969A (en) * 2014-05-29 2014-09-03 哈尔滨工程大学 Piezoelectric control pressure accumulation and stabilization oil sprayer
CN104632485A (en) * 2014-12-29 2015-05-20 沪东重机有限公司 Common-rail fuel oil jet system controlled by double electromagnetic valves and applied to low-speed diesel engine for ship

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111594368A (en) * 2020-04-17 2020-08-28 莆田市宏业精密机械有限公司 Area compensation manufacturing method of pressure balance oil nozzle and pressure balance oil nozzle manufactured by same
US11713740B1 (en) * 2022-02-24 2023-08-01 Harbin Engineering University High-pressure common rail fuel injector capable of achieving highly stable injection based on throttling damping accommodating effect

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