CN102393302B - Device and method for measuring difference of molded lines of valves in fully variable valve mechanism - Google Patents
Device and method for measuring difference of molded lines of valves in fully variable valve mechanism Download PDFInfo
- Publication number
- CN102393302B CN102393302B CN201110219976.4A CN201110219976A CN102393302B CN 102393302 B CN102393302 B CN 102393302B CN 201110219976 A CN201110219976 A CN 201110219976A CN 102393302 B CN102393302 B CN 102393302B
- Authority
- CN
- China
- Prior art keywords
- valve
- lift
- molded line
- stroke
- extended period
- 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.)
- Active
Links
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a device and a method for measuring difference of molded lines of valves in a fully variable valve mechanism. A cylinder head provided with the fully variable valve mechanism is arranged on a table-board of a mounting bracket, a valve molded line testing mechanism, a frequency conversion mechanism, a control unit and a photoelectric encoder which are connected with a valve are arranged below the cylinder head; the valve molded line testing mechanism is connected with the control unit; the input end of the frequency conversion mechanism is connected with the control unit, and the output end of the frequency conversion mechanism is connected with a cam shaft on the cylinder head through a timing belt or a chain; and the photoelectric encoder is arranged at the output end of the frequency conversion mechanism. The method comprises the following steps of: judging a stable state mode or a transient state mode; judging that whether the current testing times reaches the set testing cycle times; and drawing a comparison chart for the maximum lift, opening duration and molded lines of the valves in the stable state mode or a comparison chart for the opening/closing time, the maximum lift and the opening duration of the valves in the transient state adjusting process. By the invention, a static difference curve and a dynamic difference curve for the molded lines of the valve of various cylinders under stable state and transient state working conditions.
Description
Technical field
The present invention relates to a kind of device and method of measuring multicylinder engine valve difference of molded.Particularly relate to a kind of both can be when rotating speed, lift and phase place have all been stablized the static difference of each valve molded line measure, again can be when rotating speed, lift and phase place change each valve molded line change the device and method of each valve difference of molded of measurement fully variable valve actuator for air that course dynamic differential measures.
Background technology
The valve operational factor of conventional engines valve actuating mechanism, if the duration of valve opening close moment, valve opening is changeless, definite operating point for design that depends on of parameter.If operating point for design is chosen in large load at a high speed, can not meet the requirement of the little load of low speed, therefore traditional valve actuating mechanism is difficult to meet the engine requirement that Valve Parameters is distributed rationally in full operating mode, affects the further raising of engine performance.
Along with improving constantly that " efficient, low energy consumption, low emission " requires, valve operational factor need to dynamically be adjusted along with the change of engine operating condition, thereby in full operating mode, optimizes the scavenging period of engine.In addition, this new concept combustion mode of controlled spontaneous combustion (CAI) has embodied huge potentiality aspect energy-saving and emission-reduction, and adopt Negative valve overlap (NVO) strategy based on fully variable valve actuator for air, be considered to one of the most feasible scheme of a kind of CAI of realization.Therefore, full changeable air valve technology, the equal adjustable technology of the unlatching of valve, close moment and lift, has been subject to the increasingly extensive attention of people.
Yet, for multicylinder engine, in application, during full changeable air valve technology, can run into two major issues: 1. the static difference of each cylinder valve molded line: due to manufacturing and fixing error, the valve molded line of each cylinder of engine can not be identical, has mutual difference; 2. the dynamic differential of the adjustment process of Valve Parameters: because the adjustment process of Valve Parameters needs the time, in the dynamic adjustment process of Valve Parameters, the valve molded line of each cylinder regulates path can not guarantee identical.
The lift of valve and phase place can exert an influence to the scavenging period of engine and compression process, under engine steady state operating mode, particularly for controlled spontaneous combustion (CAI) combustion mode, the difference of valve molded line is by the difference that causes air inflow, effective compression ratio and each cylinder air inlet to reflux, aggravate the impact that intercouples between each cylinder intrinsic in Multi-Cylinder Diesel Engine, make integral combustion state deteriorating.Under the transient condition switching in the operating mode of engine, because Valve Parameters need be adjusted in real time along with the variation of operating mode, the switching engineering of changing air valve phase and lift mechanisms is difficult to that moment completes, so the parameter of each valve regulates path to certainly exist inconsistency.
Because the rotating speed of engine is higher, each working cycle time used is at Millisecond, so for handoff procedure, the difference of the variation course of the valve molded line of each cylinder can be more remarkable, this dynamic differential, by affecting the collaborative work of each cylinder in operating mode handoff procedure, affects overall performance.As the people such as Jacek Misztal of University of Birmingham mention in " Cylinder-to-Cylinder Variations in a V6 Gasoline Direct Injection HCCI Engine " literary composition, there is the significantly work inconsistency of each cylinder in the HCCI of Multi-Cylinder Diesel Engine (CAI) combustion mode, the charging efficiency of intake process can affect effective compression ratio, and then the work consistance of each cylinder is exerted an influence, and the difference of valve molded line can produce obviously impact to intake process.In sum, measurement and the evaluation of each valve molded line Static and dynamic difference of multicylinder engine, significant for processing and manufacturing and engine combustion process control procedure.
At present, the testboard bay for the valve difference of molded of multicylinder engine, also rarely has relevant document or patent to deliver.The people such as Wu Tao of Saic Motor Corporation Limited technique center, in 2010, in experimental study > > mono-literary composition of < < continuous variable lift valve operating mechanism, introduced a valve molded line testboard bay.But, this stand for be only variable lift mechanisms, in addition, do not relate to the contrast of the hyperpneustic difference of molded of multi-cylinder, concept and the evaluation test method of the dynamic differential of multicylinder engine valve are not more proposed, and the method for carrying out test process management by industrial computer management software.In the patent of the Universal detection device > > of the < < engine air valve lift by name that is 201010281223.1 at application number, a kind of proving installation of valve molded line has been proposed, but this device does not relate to the measuring method of multicylinder engine difference equally.
In sum, the difference of each cylinder valve molded line of multicylinder engine is to control at combustion in IC engine, the new problem particularly occurring in this new concept combustion pattern of controlled spontaneous combustion (CAI) is controlled.The measurement of each valve Static and dynamic difference and evaluation are for the design processing of multicylinder engine fully variable valve actuator for air, and the exploitation of corresponding combustion control theme has important reference value.
Summary of the invention
Technical matters to be solved by this invention is, provides a kind of and can realize the automatic measurement of multiengined valve molded line and complete the device and method of each valve difference of molded of measurement fully variable valve actuator for air of the Static and dynamic difference contrast of each cylinder valve molded line
The technical solution adopted in the present invention is: a kind of device and method of measuring each valve difference of molded of fully variable valve actuator for air, measure the device of each valve difference of molded of fully variable valve actuator for air, include mounting bracket, on the table top of described mounting bracket, arrange and fuel tank, the engine cylinder cover of being furnished with fully variable valve actuator for air that oil pump is connected with lubricating oil pipe, the below of described mounting bracket table top is provided with the valve molded line mechanism for testing that a plurality of valves of covering with described engine cylinder are connected, frequency conversion mechanism, control module and photoelectric encoder, described valve molded line mechanism for testing is also connected with control module, the input end connection control unit of described frequency conversion mechanism, and output terminal is by the camshaft on Timing Belt or chain connecting engine cylinder cap, described photoelectric encoder is arranged on the output terminal of frequency conversion mechanism.
Described control module includes single-chip microcomputer and industrial computer, the input end of described single-chip microcomputer connects signal output part and the fully variable valve actuator for air of valve molded line mechanism for testing, output terminal connects respectively the signal input part of industrial computer, and the fully variable valve actuator for air on connecting engine cylinder cap, the signal output part of described industrial computer connects frequency conversion mechanism.
Described frequency conversion mechanism includes frequency control motor and frequency converter, the input end of described frequency converter connects the signal output part of industrial computer, the output terminal of frequency converter connects the input end of frequency control motor, photoelectric encoder is set on the output shaft of frequency converter and passes through the camshaft on Timing Belt or chain connecting engine cylinder cap.
Described valve molded line mechanism for testing is arranged on being arranged on the sensor stand on rail plate and being arranged on the lift range sensor on sensor stand of rail plate, slip of mounting bracket bottom, on described lift range sensor, be provided with the rapid-acting coupling male/female for being connected with valve to be tested, corresponding with the described rapid-acting coupling male/female rapid-acting coupling female/male that is provided with on described valve to be tested.
For measuring the method for the device of each valve difference of molded of fully variable valve actuator for air, comprise the steps:
1) carry out initial setting;
2) judgement is equilibrium mode or transient mode, and equilibrium mode enters equilibrium mode and controls step, and transient mode enters transient mode and controls step;
3) judge whether current testing time has reached the test loop number of times of setting, and reaches testing time, carries out next step, does not reach testing time and returns to step 2.
4) draw each valve maximum lift under equilibrium mode, open each valve opening/close moment, maximum lift, the comparison diagram of unlatching extended period of extended period, molded line comparison diagram or transient state adjustment process.
Described equilibrium mode is controlled step and is comprised the steps:
1) rotating speed, valve-control and lift are adjusted path and are looked into arteries and veins stave, obtain lift and the phase parameter of the current engine speed that should carry out and valve, before this arteries and veins stave experiment, in program, write;
2) industrial computer sends rotating speed, valve-control and lift instruction to single-chip microcomputer and frequency converter, and enters valve stroke, phase adjusted, and valve molded line and the measurement of valve molded line characteristic parameter;
3) judge whether valve stroke, phase place have completed adjusting, are that steady state (SS) enters next step, are not steady state (SS)s, continue to continue to carry out status poll;
4) the real-time reception control unit of industrial computer sends the micro-tooth numbering of valve stroke, phase place, photoelectric encoder, valve opening extended period, maximum lift information;
5) preserve in real time valve stroke and micro-tooth numbering;
6) preserve in real time valve opening/close moment, valve opening extended period, maximum lift;
7) testing time adds 1.
Described transient mode is controlled step and is comprised the steps:
1) rotating speed and valve-control and lift are adjusted path and are looked into arteries and veins stave, before this arteries and veins stave experiment, in program, write, expression be the rotation speed change of motor and the adjustment process of Valve Parameters;
2) industrial computer sends rotating speed, valve-control and lift instruction to control module and frequency converter, and enters valve stroke, phase adjusted, and valve molded line and the measurement of valve molded line characteristic parameter;
3) the real-time reception control unit of industrial computer sends the micro-tooth numbering of valve stroke, phase place, photoelectric encoder, valve opening extended period, maximum lift information;
4) preserve in real time valve stroke and micro-tooth numbering;
5) preserve in real time valve opening/close moment, valve opening maximum lift, valve opening extended period;
6) testing time adds 1.
Described valve molded line and the measurement of valve molded line characteristic parameter comprise the steps:
1) the CC2 module in single-chip microcomputer, select a passage, being configured to can be by the mode of operation of the rising of external signal or negative edge triggering, when photoelectric encoder pulse signal is after modulate circuit is processed, input pin by CC2 module gathers, and along triggering break in service, the micro-tooth numbering of scrambler adds 1 simultaneously;
2) in interrupt service routine, enable AD modular converter, by configuration PEC module, realize and from AD result register, from trend RAM, carry out data transmission, complete the gatherer process of lift range sensor voltage, by filtering, process and obtain lift range sensor magnitude of voltage;
3) according to lift range sensor lift and voltage be related to arteries and veins stave, inquire about current valve stroke, judge that judgment threshold A and more front lift that whether current valve stroke is greater than valve opening are less than judgment threshold A, be execution step 5, be not to perform step 6;
4) record current micro-tooth numbering, for convenience of memory, be defined as variable: MicroTooth_Num_Start;
5) judging whether current valve stroke is greater than maximum lift nonce LiftMax_Tempt, is execution step 7, is not to perform step 8;
6) characterizing the interim peaked variable-definition of valve stroke is LiftMax_Tempt, and assignment is current lift;
7) judge whether current valve stroke is less than the judgment threshold B of valve-closing, and more front valve stroke being greater than B, is execution step 8, is not to return to 1;
8) micro-tooth numbering now deducts MicroTooth_Num_Start, is multiplied by the crank angle of a micro-tooth representative, obtains the valve opening extended period;
9) send valve maximum lift and the valve opening extended period of this circulation, LiftMax_Tempt zero clearing, sends current valve stroke, micro-tooth numbering, valve maximum lift and extended period by communication module;
10) judging whether to receive test END instruction, is to return to master control program, is not to return to step 1.
The device and method of each valve difference of molded of measurement fully variable valve actuator for air of the present invention, on testboard bay, by variable-frequency motor, simulate bent axle and drag engine cylinder cover, adopt the rapid-acting coupling of lift range sensor and valve, and the rail plate connection scheme of lift range sensor and testboard bay, realize quick between lift range sensor and different air valve and be connected switching.By single-chip microcomputer, carry out the control of fully variable valve actuator for air and gather valve stroke sensor signal, utilize the supervisory routine on industrial computer, the operational management of realization to variable-frequency motor and fully variable valve actuator for air, finally obtain the static difference of each cylinder valve molded line and dynamic differential curve under stable state and transient condition, for the Difference test of Multi-Cylinder Diesel Engine engine fully variable valve actuator for air and the exploitation of corresponding combustion control theme provide important support.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of apparatus of the present invention;
Fig. 2 is the structural representation of valve molded line mechanism for testing of the present invention;
Fig. 3 is the process flow diagram of the inventive method;
Fig. 4 is the sub-process figure of Fig. 3;
Fig. 5 is the static difference comparison diagram of equilibrium mode valve molded line of the present invention
A is valve molded line comparison diagram; B is valve maximum lift comparison diagram; C is valve opening extended period comparison diagram;
Fig. 6 is transient mode valve molded line dynamic differential comparison diagram of the present invention
A is valve opening close moment comparison diagram; B is valve maximum lift comparison diagram; C is valve opening extended period comparison diagram.
Wherein:
1: mounting bracket 2: engine cylinder cover
3: fuel tank 4: valve molded line mechanism for testing
4-1: rapid-acting coupling female/male 4-2: rapid-acting coupling male/female
4-3: lift range sensor 4-4 sensor stand
4-5: rail plate 5: Timing Belt
6: control module 6-1: single-chip microcomputer
6-2: industrial computer 7: photoelectric encoder
8: the 8-1 of frequency conversion mechanism: frequency control motor
8-2: frequency converter 9: valve
Embodiment
Below in conjunction with embodiment and accompanying drawing, the device and method of each valve difference of molded of measurement fully variable valve actuator for air of the present invention is described in detail.
For realizing the direct measurement to valve stroke, the device of each valve difference of molded of measurement fully variable valve actuator for air of the present invention is fixed on engine cylinder cover on testboard bay, by motor, drag simulation crankshaft rotating, utilize tangent displacement sensor to measure the lift of valve, for quick the connection and quick switching between different air valve that facilitates displacement transducer and valve, the present invention has adopted take quick connection and the switching device shifter that rapid-acting coupling and rail plate scheme be feature.Adopt single-chip microcomputer gather lift range sensor signal and directly lift sent to industrial computer by communication module, the monitoring and control management software of industrial computer manages the operation of variable-frequency motor and fully variable valve actuator for air, finally measure the Static and dynamic difference curve that calculates the valve molded line under equilibrium mode and transient mode, obtain the Static and dynamic difference of each valve molded line of multicylinder engine.
As shown in Figure 1, the device of each valve difference of molded of measurement fully variable valve actuator for air of the present invention, include mounting bracket 1, on the table top of described mounting bracket 1, arrange and fuel tank, the engine cylinder cover of being furnished with fully variable valve actuator for air 2 that oil pump is connected with lubricating oil pipe 3, the below of described mounting bracket 1 table top is provided with the valve molded line mechanism for testing 4 being connected with a plurality of valves 9 on described engine cylinder cover 2, frequency conversion mechanism 8, control module 6 and photoelectric encoder 7, described valve molded line mechanism for testing 4 is also connected with control module 6, the input end connection control unit 6 of described frequency conversion mechanism 8, and output terminal is by the camshaft on Timing Belt or chain 5 connecting engine cylinder caps 2, described photoelectric encoder 7 is arranged on the output terminal of frequency conversion mechanism 8.Valve molded line mechanism for testing mounting bracket need to be definite according to the physical size of engine cylinder cover, variable-frequency motor and layout, and method for designing material is chosen as method well-known to those skilled in the art.The engine cylinder cover of being furnished with fully variable valve actuator for air, engine cylinder cap lubricating oil way, the frequency control motor of simulated engine bent axle and frequency converter, all existing material object or product, rotating speed and the moment of torsion of the cylinder cap of testing as required, the power type selecting to variable-frequency motor, and according to the lubrication instruction of engine cylinder cover, arranging corresponding lubricant passage way, is that this technology is known by those skilled in the art.In addition, on variable-frequency motor, need installation car engine crankshaft code-disc, with the code-disc of 60-2 tooth for the most common, on cylinder cap, need to configure sensor and the actuator of corresponding fully variable valve actuator for air, the execution of signal and the feedback of valve-control and lift for fully variable valve actuator for air, controlled, the method is that the control system institute of full variable ratio valve mechanism is necessary, is well known to those skilled in the art.
Described control module 6 includes single-chip microcomputer 6-1 and industrial computer 6-2, the input end of described single-chip microcomputer 6-1 connects signal output part and the fully variable valve actuator for air of valve molded line mechanism for testing 4, output terminal connects respectively the signal input part of industrial computer 6-2, and the fully variable valve actuator for air on connecting engine cylinder cap 2, the signal output part of described industrial computer 6-2 connects frequency conversion mechanism 8.
Described frequency conversion mechanism 8 includes frequency control motor 8-1 and frequency converter 8-2, the input end of described frequency converter 8-2 connects the signal output part of industrial computer 6-2, the output terminal of frequency converter 8-2 connects the input end of frequency control motor 8-1, photoelectric encoder 7 is set on the output shaft of frequency converter 8-1 and passes through the camshaft on Timing Belt or chain 5 connecting engine cylinder caps 2.
As shown in Figure 2, described valve molded line mechanism for testing 4 is arranged on being arranged on the sensor stand 4-4 on rail plate 4-5 and being arranged on the lift range sensor 4-3 on sensor stand 4-4 of rail plate 4-5, slip of mounting bracket 1 bottom, on described lift range sensor 4-3, be provided with the rapid-acting coupling male/female 4-2 for being connected with valve 9 to be tested, corresponding with the described rapid-acting coupling male/female 4-2 rapid-acting coupling female/male 4-1 that is provided with on described valve to be tested 9.
Between valve and lift range sensor, can be connected fast with departing from and be connected; Rail plate for installation lift range sensor support: valve stroke sensor stand can slide on rail plate, can realize the quick aligning between valve and lift range sensor, the conventional connection scheme that is mechanical field for rail plate and rapid-acting coupling, for those skilled in the art know.By adopting this connection scheme, can reduce needed lift range sensor number, reduce costs and reduce the difference interference that measurement brings to valve molded line between different lift range sensors, in addition, adopt rapid-acting coupling and high-precision slide guide rail scheme can improve connection speed and measuring accuracy.
Described single-chip microcomputer, (common as every circle 1000 teeth or 720 teeth etc. by photoelectric encoder, for engine art sensors) trigger single-chip microcomputer the lift range sensor signal through signal condition is gathered, through processing, calculate, by communication module, in real time the lift numerical value of valve is sent to industrial computer.Single-chip microcomputer type selecting of the present invention can make multiple, and the XC164 series monolithic of company of Infineon of take is example, but is not limited to this kind of single-chip microcomputer.
Control module completes the control function to fully variable valve actuator for air on the one hand, and the lift and the phase place that receive on the one hand the management software transmission of industrial computer are adjusted instruction, and feeds back the actual lift that current actual phase and theoretical lift and lift range sensor are measured.Communication mode can adopt CAN communication or serial communication, and concrete communication protocol can be according to corresponding Rulemaking, and the implementation of this function is well known to those skilled in the art.
Management software on industrial computer can be realized with softwares such as Visual Basic or Visual C++ or matlab, communicate by letter with fully variable valve actuator for air controller on the one hand, send valve stroke and phase settings instruction, obtain the feedback of valve stroke and phase place actual value simultaneously, communicate by letter with frequency converter on the one hand, communication protocol according to frequency converter producer regulation is set the rotating speed of motor, and the above communication technology is also well known to those skilled in the art.
Each described valve difference of molded measuring method has two kinds of measurement patterns: the steady state measurement pattern that A. engine speed, valve stroke and three variablees of phase place all remain unchanged; B. in engine speed, valve stroke and three variablees of phase place, has the instantaneous measurement pattern of a variation at least.
Due to design and mismachining tolerance, the valve molded line of each cylinder can not be in full accord, and the maximum lift of each valve and the extended period of valve opening be difference to some extent all.Under engine steady state operating mode, the lift of valve and phase place can exert an influence to the scavenging period of engine and compression process.The difference of the valve molded line of each cylinder can cause the air inflow of each cylinder and the difference of effective compression ratio.Especially for controlled spontaneous combustion (CAI) combustion mode, the difference of air inflow and effective compression ratio and the air inlet backflow phenomenon causing due to valve opening close moment difference, can cause the notable difference of the fired state of each cylinder, further aggravate the impact that intercouples between each cylinder intrinsic in Multi-Cylinder Diesel Engine, make integral combustion state deteriorating.Under the transient mode of switching in the operating mode of engine, Valve Parameters need to be adjusted in real time along with the variation of operating mode.The switching engineering of changing air valve phase and lift mechanisms is difficult to that moment completes, so the parameter of each valve regulates path to certainly exist difference.Because the rotating speed of engine is high, each working cycle time used is short, so each circulation in handoff procedure, the dynamic differential of the variation course of the valve molded line of each cylinder can be more obvious, this dynamic differential, by affecting the difference between each cylinder in operating mode handoff procedure, produces a very large impact overall performance.
Therefore, the static difference to each valve molded line under steady state condition and test and the evaluation of the dynamic differential under transient condition, for fully variable valve actuator for air manufacture and design and the exploitation of the compensation policy that burns accordingly significant.
As shown in Figure 3, of the present invention for measuring the method for the device of each valve difference of molded of fully variable valve actuator for air, comprise the steps:
1) carry out initial setting, comprise that valve stroke, phase place, engine speed, Valve Parameters regulate path;
2) judgement is equilibrium mode or transient mode, and equilibrium mode enters equilibrium mode and controls step, and transient mode enters transient mode and controls step;
Described equilibrium mode is controlled step and is comprised the steps:
(1) rotating speed, valve-control and lift are adjusted path and are looked into arteries and veins stave, obtain lift and the phase parameter of the current engine speed that should carry out and valve, before the experiment of this map (arteries and veins spectrum) table, in program, write;
(2) industrial computer sends rotating speed, valve-control and lift instruction to single-chip microcomputer and frequency converter, and enters valve stroke, phase adjusted, and valve molded line and the measurement of valve molded line characteristic parameter;
(3) judge whether valve stroke, phase place have completed adjusting, are that steady state (SS) enters next step, are not steady state (SS)s, continue to continue to carry out status poll;
(4) the real-time reception control unit of industrial computer sends the micro-tooth numbering of valve stroke, phase place, photoelectric encoder, valve opening extended period, maximum lift information;
(5) preserve in real time valve stroke and micro-tooth numbering;
(6) preserve in real time valve opening/close moment, valve opening extended period, maximum lift;
(7) testing time adds 1;
Described transient mode is controlled step and is comprised the steps:
(1) rotating speed and valve-control and lift are adjusted path and are looked into arteries and veins stave, and this map (arteries and veins spectrum) table writes before testing in program, expression be the rotation speed change of motor and the adjustment process of Valve Parameters;
(2) industrial computer sends rotating speed, valve-control and lift instruction to control module and frequency converter, and enters valve stroke, phase adjusted, and valve molded line and the measurement of valve molded line characteristic parameter;
The micro-tooth numbering of valve stroke, photoelectric encoder that (3) the real-time reception control unit of industrial computer sends, valve opening extended period,
Maximum lift information;
(4) preserve in real time valve lift curve;
(5) preserve in real time valve opening/close moment, open maximum lift, valve opening extended period;
(6) testing time adds 1;
3) judge whether current testing time has reached the test loop number of times of setting, and reaches testing time, carries out next step, does not reach testing time and returns to step 2
4) draw each valve maximum lift under equilibrium mode, open each valve opening/close moment, maximum lift, the comparison diagram of unlatching extended period of extended period, molded line comparison diagram or transient state adjustment process.
As shown in Figure 4, at the valve molded line described in equilibrium mode step and transient mode step and the measurement of valve molded line characteristic parameter, comprise the steps:
(1) the CC2 module in XC164 single-chip microcomputer, select a channel (passage), being configured to can be by the mode of operation of the rising of external signal or negative edge triggering, when photoelectric encoder pulse signal is after modulate circuit is processed, input pin by CC2 module gathers, and along triggering break in service, the micro-tooth numbering of scrambler adds 1 simultaneously;
(2) in interrupt service routine, enable AD modular converter, by configuration PEC module, realize and from AD result register, from trend RAM, carry out data transmission, complete the gatherer process of lift range sensor voltage, by filtering, process and obtain lift range sensor magnitude of voltage;
(3) according to lift range sensor lift and voltage, be related to arteries and veins stave, inquire about current valve stroke, judge whether current valve stroke is greater than the judgment threshold A of valve opening (empirical value that can adopt 0.2mm is threshold value) and more front lift is less than judgment threshold A, being execution step 5, is not to perform step 6;
(4) record current micro-tooth numbering, for convenience of memory, can be defined as variable: MicroTooth_Num_Start, so-called micro-tooth numbering, it is the count value of the number of teeth counter of photoelectric encoder, micro-tooth numbering initial value is 0, and each micro-tooth signal rising edge/negative edge enters numbering+1, the initial hour counter zero clearing of each engine operational cycle;
(5) judging whether current valve stroke is greater than maximum lift nonce, can be defined as variable: LiftMax_Tempt, is execution step 7, is not to perform step 8;
(6) characterizing the interim peaked variable of valve stroke (can be defined as LiftMax_Tempt) assignment is current lift;
(7) judge whether current valve stroke is less than the judgment threshold B of valve-closing, and more front valve stroke being greater than B, is execution step 8, is not to return to 1;
(8) micro-tooth numbering now deducts MicroTooth_Num_Start, is multiplied by the crank angle (crank angle of a tooth of photoelectric encoder of 1000 tooth/circles is 360/1000 ° of CA) of a micro-tooth representative, obtains the valve opening extended period;
(9) send valve maximum lift and the valve opening extended period of this circulation, LiftMax_Tempt zero clearing, sends current valve stroke, micro-tooth numbering, valve maximum lift and extended period by communication module (take CAN module as example).Communication baud rate, ID, communication protocol need to be coordinated with the management software of industrial computer, are well known to those skilled in the art;
(10) judging whether to receive test END instruction, is to return to master control program, is not to return to step 1.
As shown in Figure 5, under steady state test operating mode, the lift crank angle change curve of each valve after repeatedly measuring is on average, the correlation curve of valve molded line characteristic parameter (valve maximum lift, valve opening extended period): (wherein thick line is valve 1, fine rule is valve 2, dotted line is valve n) a figure transverse axis is crank angle/° CA, the longitudinal axis is the lift of valve under each crank angle, and what the figure shows is that the lift of each valve is with the difference of crank angle Changing Pattern; B figure transverse axis is valve numbering, and the longitudinal axis is valve opening maximum lift, and what this figure characterized is the maximum lift difference of different air valve; C figure transverse axis is valve numbering, and the longitudinal axis is valve opening maximum lift, and what this figure characterized is the difference of the unlatching extended period of different air valve.
As shown in Figure 6, be the molded line of each valve under transient condition, the correlation curve of valve molded line characteristic parameter (valve opening/close moment, valve maximum lift, valve opening extended period) each circulation in whole adjustment process.(wherein Δ is valve 1, the 0th, valve 2, is valve n) a figure transverse axis is numbering cycle, the longitudinal axis is valve opening or off-position (unit is crank angle), the figure shows be each valve in adjustment process, valve opening and close moment change the difference of course; B figure transverse axis is numbering cycle, and the longitudinal axis is the maximum lift in each circulation of valve, the figure shows be each valve in adjustment process, maximum lift changes the difference of course; C figure transverse axis is numbering cycle, and the longitudinal axis is the unlatching extended period in each circulation of valve, the figure shows be each valve in adjustment process, open the difference of the variation course of extended period.By software, carry out above the realization of automatic mapping function, by those skilled in the art of the present technique are known.
Claims (2)
1. one kind for measuring the method for the device of each valve difference of molded of fully variable valve actuator for air, the device of measuring each valve difference of molded of fully variable valve actuator for air includes mounting bracket (1), on the table top of described mounting bracket (1), arrange and fuel tank, the engine cylinder cover of being furnished with fully variable valve actuator for air (2) that oil pump is connected with lubricating oil pipe (3), the below of described mounting bracket (1) table top is provided with the valve molded line mechanism for testing (4) being connected with valve (9) a plurality of to be tested on described engine cylinder cover (2), frequency conversion mechanism (8), control module (6) and photoelectric encoder (7), described valve molded line mechanism for testing (4) is also connected with control module (6), the input end connection control unit (6) of described frequency conversion mechanism (8), and output terminal is by the camshaft on Timing Belt or chain (5) connecting engine cylinder cap (2), described photoelectric encoder (7) is arranged on the output terminal of frequency conversion mechanism (8), described control module (6) includes single-chip microcomputer (6-1) and industrial computer (6-2), the input end of described single-chip microcomputer (6-1) connects signal output part and the fully variable valve actuator for air of valve molded line mechanism for testing (4), output terminal connects respectively the signal input part of industrial computer (6-2), and the fully variable valve actuator for air on connecting engine cylinder cap (2), the signal output part of described industrial computer (6-2) connects frequency conversion mechanism (8), described frequency conversion mechanism (8) includes frequency control motor (8-1) and frequency converter (8-2), the input end of described frequency converter (8-2) connects the signal output part of industrial computer (6-2), the output terminal of frequency converter (8-2) connects the input end of frequency control motor (8-1), photoelectric encoder (7) is set on the output shaft of frequency control motor (8-1) and passes through the camshaft on Timing Belt or chain (5) connecting engine cylinder cap (2), described valve molded line mechanism for testing (4) includes the rail plate (4-5) that is arranged on mounting bracket (1) bottom, that slides is arranged on the sensor stand (4-4) on rail plate (4-5) and is arranged on the lift range sensor (4-3) on sensor stand (4-4), on described lift range sensor (4-3), be provided with the rapid-acting coupling male/female (4-2) being connected for the valve with to be tested (9), upper and the described rapid-acting coupling male/female (4-2) of described valve to be tested (9) is corresponding is provided with rapid-acting coupling female/male (4-1), it is characterized in that, method comprises the steps:
1) carry out initial setting;
2) judgement is equilibrium mode or transient mode, and equilibrium mode enters equilibrium mode and controls step, and transient mode enters transient mode and controls step;
Described equilibrium mode is controlled step and is comprised the steps:
(1) rotating speed, valve-control and lift are adjusted path and are looked into arteries and veins stave, obtain lift and the phase parameter of the current engine speed that should carry out and valve, before this arteries and veins stave experiment, in program, write;
(2) industrial computer sends rotating speed, valve-control and lift instruction to single-chip microcomputer and frequency converter, and enters valve stroke, phase adjusted, and valve molded line and the measurement of valve molded line characteristic parameter;
(3) judge whether valve stroke, phase place have completed adjusting, are that steady state (SS) enters next step, are not steady state (SS)s, continue to continue to carry out status poll;
(4) the real-time reception control unit of industrial computer sends the micro-tooth numbering of valve stroke, phase place, photoelectric encoder, valve opening extended period, maximum lift information;
(5) preserve in real time the micro-tooth numbering of valve stroke and photoelectric encoder;
(6) preserve in real time valve opening/close moment, valve opening extended period, maximum lift;
(7) testing time adds 1;
Described transient mode is controlled step and is comprised the steps:
(1) rotating speed and valve-control and lift are adjusted path and are looked into arteries and veins stave, before this arteries and veins stave experiment, in program, write, expression be the rotation speed change of motor and the adjustment process of Valve Parameters;
(2) industrial computer sends rotating speed, valve-control and lift instruction to control module and frequency converter, and enters valve stroke, phase adjusted, and valve molded line and the measurement of valve molded line characteristic parameter;
(3) the real-time reception control unit of industrial computer sends the micro-tooth numbering of valve stroke, phase place, photoelectric encoder, valve opening extended period, maximum lift information;
(4) preserve in real time valve stroke and micro-tooth numbering;
(5) preserve in real time valve opening/close moment, valve opening maximum lift, valve opening extended period;
(6) testing time adds 1;
3) judge whether current testing time has reached the test loop number of times of setting, and reaches test loop number of times, carries out next step, does not reach test loop number of times and returns to step 2)
;
4) draw each valve maximum lift under equilibrium mode, open each valve opening/close moment, maximum lift, the comparison diagram of unlatching extended period of extended period, molded line comparison diagram or transient state adjustment process.
2. according to claim 1ly for measuring the method for the device of each valve difference of molded of fully variable valve actuator for air, it is characterized in that, described valve molded line and the measurement of valve molded line characteristic parameter comprise the steps:
(1) the CC2 module in single-chip microcomputer, select a passage, being configured to can be by the mode of operation of the rising of external signal or negative edge triggering, when photoelectric encoder pulse signal is after modulate circuit is processed, input pin by CC2 module gathers, and triggering break in service, the micro-tooth numbering of photoelectric encoder adds 1 simultaneously;
(2) in interrupt service routine, enable AD modular converter, by configuration PEC module, realize and from AD result register, from trend RAM, carry out data transmission, complete the gatherer process of lift range sensor voltage, by filtering, process and obtain lift range sensor magnitude of voltage;
(3) according to lift range sensor lift and voltage, be related to arteries and veins stave, inquire about current valve stroke, judging that judgment threshold A and more front valve stroke that whether current valve stroke is greater than valve opening are less than judgment threshold A, is execution step (4), is not to perform step (5);
(4) record current micro-tooth numbering, for convenience of memory, be defined as variable: MicroTooth_Num_Start;
(5) judging whether current valve stroke is greater than maximum lift nonce LiftMax_Tempt, is execution step (6), is not to perform step (7);
(6) characterizing the interim peaked variable-definition of valve stroke is LiftMax_Tempt, and assignment is current valve stroke;
(7) judge whether current valve stroke is less than the judgment threshold B of valve-closing, and more front valve stroke being greater than B, is execution step (8), is not to return to step (1);
(8) micro-tooth numbering now deducts MicroTooth_Num_Start, is multiplied by the crank angle of a micro-tooth representative, obtains the valve opening extended period;
(9) send valve maximum lift and the valve opening extended period of this circulation, LiftMax_Tempt zero clearing, sends current valve stroke, micro-tooth numbering, valve maximum lift and extended period by communication module;
(10) judging whether to receive test END instruction, is to return to master control program, is not to return to step (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110219976.4A CN102393302B (en) | 2011-08-02 | 2011-08-02 | Device and method for measuring difference of molded lines of valves in fully variable valve mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110219976.4A CN102393302B (en) | 2011-08-02 | 2011-08-02 | Device and method for measuring difference of molded lines of valves in fully variable valve mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102393302A CN102393302A (en) | 2012-03-28 |
| CN102393302B true CN102393302B (en) | 2014-11-26 |
Family
ID=45860662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110219976.4A Active CN102393302B (en) | 2011-08-02 | 2011-08-02 | Device and method for measuring difference of molded lines of valves in fully variable valve mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102393302B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913122A (en) * | 2014-04-22 | 2014-07-09 | 济南大学 | Workpiece length measurement device |
| CN107884194A (en) * | 2017-11-07 | 2018-04-06 | 西华大学 | A kind of big valve stroke measurement and knock-on test device and method |
| CN108106853B (en) * | 2017-12-19 | 2019-09-10 | 杰锋汽车动力系统股份有限公司 | A kind of electronic type variable valve timing system device for testing functions and its test method |
| CN110966063B (en) * | 2018-09-30 | 2021-09-14 | 上海汽车集团股份有限公司 | Method and device for controlling variable valve timing system of Miller cycle engine |
| CN110567698A (en) * | 2019-09-18 | 2019-12-13 | 天津市津聿动力科技有限公司 | Testing device and method for timing and lift measurement of variable valve of engine |
| CN115859532B (en) * | 2023-02-10 | 2023-05-23 | 潍柴动力股份有限公司 | Multi-cylinder engine air inlet molded line design method and multi-cylinder engine |
| CN117007321B (en) * | 2023-10-08 | 2024-03-19 | 广州汉东工业自动化装备有限公司 | Engine timing detection device and method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005016340A (en) * | 2003-06-24 | 2005-01-20 | Hitachi Unisia Automotive Ltd | Fail safe controller for internal combustion engine with variable valve sytem |
| US8607549B2 (en) * | 2009-07-31 | 2013-12-17 | Ford Global Technologies, Llc | Controlling regeneration of an emission control device |
-
2011
- 2011-08-02 CN CN201110219976.4A patent/CN102393302B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102393302A (en) | 2012-03-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102393302B (en) | Device and method for measuring difference of molded lines of valves in fully variable valve mechanism | |
| CN100541160C (en) | The testing synthesis parameter devices and methods therefor of aviation piston engine | |
| CN100501143C (en) | Internal combustion engine, engine management system and method for internal combustion engine | |
| CN105022383B (en) | Marine Medium-speed Diesel Engine high pressure co-rail system hardware-in-loop simulation test platform and test method | |
| CN106704012B (en) | Methanol-Diesel Dual-Fuel Engine control system and method | |
| CN103699035B (en) | Signal matching method and signal matching device for vehicle engine hardware-in-loop simulation process | |
| CN102066722B (en) | Fuel system injection timing diagnostics by analyzing cylinder pressure signal | |
| CN102003298A (en) | Real-time feedback device and method of combustion information for controlling engine | |
| CN105156211B (en) | A kind of electronic control system for small-sized single cylinder four-stroke gasoline engine | |
| CN103590917A (en) | Method for operating an internal combustion engine | |
| CN102182601B (en) | Method and device for diagnosing and calibrating faults in high-pressure common rail system | |
| CN102072064B (en) | The method of measurement of engine oil advance angle measuring system | |
| KR102055080B1 (en) | How to determine the composition of the fuel used to operate an internal combustion engine | |
| CN103089460A (en) | Engine exhaust gas recirculation (EGR) valve closed-loop control system | |
| CN104198192A (en) | Testing device of variable valve system and testing method thereof | |
| CN109973280A (en) | A kind of combustion knock automatic calibration method | |
| CN103161642A (en) | Internal combustion engine control apparatus | |
| CN103631256B (en) | A kind of method of engine signal analog simulation test board and test ECU thereof | |
| CN111133184A (en) | Method for checking the function of a pressure sensor in the air intake or exhaust gas discharge line of an internal combustion engine during operation, and engine control unit | |
| CN102135023B (en) | Method for controlling an engine valve of an internal combustion engine | |
| CN101634251A (en) | Internal combustion engine electronic control developing system based on industrial personnel computer | |
| CN203098118U (en) | Electric control oil injection simulation experimental system for engine | |
| CN103764979A (en) | Method and apparatus for controlling knock in an internal combustion engine | |
| CN204041250U (en) | For engine intelligent controller and the Bench Test System of stand test | |
| CN110700915A (en) | OCV valve measurement and control device, method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |