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CN102235216A - Control system and method for improved efficiency of particulate matter filter regeneration - Google Patents

Control system and method for improved efficiency of particulate matter filter regeneration Download PDF

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Publication number
CN102235216A
CN102235216A CN2011101138617A CN201110113861A CN102235216A CN 102235216 A CN102235216 A CN 102235216A CN 2011101138617 A CN2011101138617 A CN 2011101138617A CN 201110113861 A CN201110113861 A CN 201110113861A CN 102235216 A CN102235216 A CN 102235216A
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CN
China
Prior art keywords
engine
exhaust
desired amount
injection
control system
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.)
Pending
Application number
CN2011101138617A
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Chinese (zh)
Inventor
J.C.谭
J.蔡尔斯特拉
C.特勒
G.特佩迪诺
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GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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Publication of CN102235216A publication Critical patent/CN102235216A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402—Multiple injections
    • F02D41/405—Multiple injections with post injections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/07—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas flow rate or velocity meter or sensor, intake flow meters only when exclusively used to determine exhaust gas parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0411—Methods of control or diagnosing using a feed-forward control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
    • F02D41/025—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by changing the composition of the exhaust gas, e.g. for exothermic reaction on exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
    • F02D41/182—Circuit arrangements for generating control signals by measuring intake air flow for the control of a fuel injection device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The invention relates to a control system and method for improved efficiency of particulate matter filter regeneration. The engine control system includes an injection determination module and an injection distribution module. The injection determination module determines a desired amount of hydrocarbons (HC) to inject into exhaust gas produced by an engine for regeneration of a particulate matter (PM) filter. The injection distribution module controls a ratio of auxiliary injection to post-combustion injection based on engine load, engine speed, and the desired amount of HC injection, wherein auxiliary injection includes injecting HC into the exhaust gas, and wherein post-combustion injection includes injecting HC into cylinders of the engine during a period after combustion.

Description

Be used to improve the control system and the method for particulate filter regeneration efficiency
Technical field
Present disclosure relates to explosive motor, relates more specifically to be used for control and hydrocarbon (HC) is ejected into the exhaust that produced by motor to improve the system and method for particulate matter (PM) filter regeneration efficient.
Background technique
The background of present disclosure is provided to present generally in this background purpose of description that provides.Present inventor's part of work is described in background technique part, and this part content and this are described in when submitting to may be in addition as the aspect of prior art, all both indeterminately also is not considered to destroy prior art of the present invention implicitly.
To form air/fuel (A/F) mixture, the A/F mixture burns in a plurality of cylinder combustion explosive motor with air and fuel mix.The combustion driven piston of A/F mixture so that bent axle rotatably rotate, thereby produce driving torque.Particularly, air can be sucked in the cylinder and use Piston Compression.Then, fuel can mix (that is, being ejected in the pressurized air) with pressurized air, makes pressurized A/F mixture burns (for example, ignition by compression or CI motor).For example, the CI motor comprises diesel engine.
Alternately, air can be before compression with fuel mix to form the A/F mixture.The A/F mixture can be compressed then, reaches critical pressure and/or temperature up to the A/F mixture, and lights (for example, homogeneous charge compression-ignition or hcci engine) automatically.Yet hcci engine also can use the spark from spark plug " to assist " lighting of A/F mixture.In other words, hcci engine uses spark aid lighting A/F mixture according to engine working conditions.For example, hcci engine can use spark auxiliary under low engine loading.
The exhaust that produces in combustion process can be expelled in the gas exhaust manifold from cylinder.Exhaust can comprise carbon monoxide (CO) and hydrocarbon (HC).Because the CI motor is compared with plug ignition (SI) motor with hcci engine and is had higher combustion temperature, thereby exhaust also can comprise nitrogen oxide (NO x).Exhaust-gas treatment system can be handled exhaust to remove CO, HC and/or NO xFor example, exhaust-gas treatment system can include but not limited at least a in following: oxidation catalyst (OC), particulate matter (PM) filter, selective catalytic reduction (SCR) system, NO xAbsorbing agent/sorbent, and catalytic converter.
Summary of the invention
A kind of engine control system, it comprises injection injection determination module and injection spray distribution module.Injection is sprayed determination module and is determined that injection is ejected in the exhaust that is produced by motor the desired amount with the hydrocarbon (HC) that carries out particulate matter particulate matter (PM) filter regeneration.Injection spray distribution module is controlled the auxiliary injection injection and is injected the ratio of injection with respect to the burning back based on engine loading, engine speed and HC injection injection desired amount, wherein, auxiliary injection sprays and to comprise the HC injection is ejected in the described exhaust, and the injection of burning back is sprayed in the period that then is included in after the burning HC injection is ejected in the cylinder of described motor.
A kind of method, it comprises: determine to be ejected in the exhaust that is produced by motor the desired amount with the hydrocarbon (HC) that carries out particulate matter (PM) filter regeneration; With spray desired amount based on engine loading, engine speed and HC and control the ratio that secondary injection is sprayed with respect to the burning back, wherein, secondary injection comprises HC is ejected in the described exhaust, and the burning back is sprayed in the period that then is included in after the burning HC is ejected in the cylinder of described motor.
In further feature, aforementioned system and method realize by the computer program of being carried out by one or more processors.Computer program can reside on entity (or tangible) computer-readable medium, such as but not limited to: storage, non-volatile data memory, and/or other entity stores medium that is fit to.
This paper also provides following scheme:
1. 1 kinds of engine control systems of scheme comprise:
Spray determination module, it determines to be ejected in the exhaust that is produced by motor the desired amount with the hydrocarbon HC that carries out particulate matter PM filter regeneration; With
The spray distribution module, it sprays the ratio that desired amount control secondary injection is sprayed with respect to the burning back based on engine loading, engine speed and described HC, wherein, secondary injection comprises HC is ejected in the described exhaust, and wherein the burning back is sprayed in the period that is included in after the burning HC is ejected in the cylinder of described motor.
Scheme 2. is as scheme 1 described engine control system, and wherein, described spray distribution module is sprayed desired amount based on described engine loading, described engine speed and described HC and determined secondary injection amount and burning back emitted dose.
Scheme 3. further comprises as scheme 2 described engine control systems:
Regeneration control module, it generates the control signal that is used for auxiliary HC sparger and fuel injector based on described secondary injection amount and burning back emitted dose respectively.
Scheme 4. is as scheme 3 described engine control systems, and wherein, described auxiliary HC sparger is arranged in the upstream of the oxidation catalyst OC of exhaust-gas treatment system, and wherein said fuel injector is corresponding to the cylinder of described motor.
Scheme 5. is as scheme 4 described engine control systems, wherein, described regeneration control module generate with described cylinder in one group of control signal that corresponding fuel injector is used.
Scheme 6. is as scheme 2 described engine control systems, and wherein, described spray distribution module uses question blank to determine that factor, described question blank comprise a plurality of factors relevant with engine loading and engine speed.
Scheme 7. is as scheme 6 described engine control systems, wherein, described spray distribution module is determined described secondary injection amount based on the product of described factor and described HC injection desired amount, and wherein said spray distribution module is determined described burning back emitted dose based on the difference that described HC sprays desired amount and determined secondary injection amount.
Scheme 8. is as scheme 1 described engine control system, and wherein, described injection determination module determines that in the temperature of the ingress of described PM filter described HC sprays desired amount based on described exhaust.
Scheme 9. is as scheme 8 described engine control systems, and wherein, described injection determination module determines to be ejected into the desired amount of the HC in the described exhaust based in extraction flow and the car speed at least one.
Scheme 10. is as scheme 9 described engine control systems, and wherein, described injection determination module is carried out proportion integration differentiation PID control to the desired amount that is ejected into the HC in the described exhaust.
11. 1 kinds of methods of scheme comprise:
Determine to be ejected in the exhaust that produces by motor desired amount with the hydrocarbon HC that carries out particulate matter PM filter regeneration; With
Spray desired amount based on engine loading, engine speed and described HC and control the ratio that secondary injection is sprayed with respect to the burning back, wherein, secondary injection comprises HC is ejected in the described exhaust, and wherein the burning back is sprayed in the period that is included in after the burning HC is ejected in the cylinder of described motor.
Scheme 12. further comprises as scheme 11 described methods:
Spray desired amount based on described engine loading, described engine speed and described HC and determine secondary injection amount and burning back emitted dose.
Scheme 13. further comprises as scheme 12 described methods:
Generate the control signal that is used for auxiliary HC sparger and fuel injector based on described secondary injection amount and burning back emitted dose respectively.
Scheme 14. is as scheme 13 described methods, and wherein, described auxiliary HC sparger is positioned at the upstream of oxidation catalyst OC in exhaust-gas treatment system, and wherein said fuel injector is corresponding to the cylinder of described motor.
Scheme 15. further comprises as scheme 14 described methods:
Generate one group of control signal that corresponding fuel injector is used in the cylinder with described motor.
Scheme 16. further comprises as scheme 12 described methods:
Use question blank to determine factor, described question blank comprises a plurality of factors relevant with engine loading and engine speed.
Scheme 17. further comprises as scheme 16 described methods:
Product based on described factor and described HC injection desired amount is determined described secondary injection amount; With
Spray the difference of desired amount and determined secondary injection amount based on described HC and determine described burning back emitted dose.
Scheme 18. further comprises as scheme 11 described methods:
Determine that in the temperature of the ingress of described PM filter described HC sprays desired amount based on described exhaust.
Scheme 19. further comprises as scheme 18 described methods:
Determine to be ejected into the desired amount of the HC in the described exhaust based in extraction flow and the car speed at least one.
Scheme 20. further comprises as scheme 19 described methods:
The desired amount that is ejected into the HC in the described exhaust is carried out proportion integration differentiation PID control.
By the detailed description that provides hereinafter, the further application of present disclosure will become obvious.Should be understood that to describe in detail only to be used for the illustration purpose, and be not used in the scope of restriction present disclosure with concrete example.
Description of drawings
By the detailed description and the accompanying drawings, the present disclosure easier complete understanding that will become, in the accompanying drawing:
Fig. 1 is the functional block diagram according to the exemplary engine system of present disclosure;
Fig. 2 is the functional block diagram according to the exemplary control module of present disclosure;
Fig. 3 is the functional block diagram according to the exemplary spray distribution module of present disclosure;
Fig. 4 is that example illustrates according to present disclosure, the figure line of exemplary delivery temperature (EGT) control during particulate matter (PM) filter regeneration; With
Fig. 5 is the flow chart that is used in the control of PM filter regeneration process hydrocarbon (HC) being ejected into the illustrative methods in the engine exhaust according to present disclosure.
Embodiment
It in fact only is exemplary below describing, and never is to be used to limit present disclosure, its application and use.For the sake of clarity, identical reference character will be used to identify similar element in the drawings.Should be considered to be meant logic (A or B or C) in this employed wording " among A, B and the C at least a ", wherein use the nonexcludability logical "or".Should be understood that under the situation of the principle that does not change present disclosure, the step in method can be carried out by different order.
Be meant specific integrated circuit (ASIC) at this employed term " module ", electronic circuit, carry out the processor (shared, special-purpose or group processor) and the storage of one or more softwares or firmware program, combinational logic circuit, and/or other suitable parts of described function are provided.
Ignition by compression (CI) motor (for example diesel engine) can comprise similar exhaust-gas treatment system with homogeneous charge compression-ignition (HCCI) motor.More specifically, the exhaust-gas treatment system that is used for CI and hcci engine can comprise: oxidation catalyst (OC), it is positioned at (that is, at its upstream) before selective catalytic reduction (SCR) catalyzer and particulate matter (PM) filter.OC oxidizing carbon monoxide (CO) and hydrocarbon (HC) are to form carbon dioxide (CO 2) and water (H 2O).SCR catalyzer (with the agent (agent) of dispensing, for example urea) is removed nitrogen oxide (NO from exhaust x).
On the other hand, the PM filter is removed PM from exhaust.The PM filter can be removed PM from exhaust, saturated up to the PM filter.In other words, saturated situation can be full of for example cigarette ash of PM(corresponding to the PM filter) in, after this can begin regenerative cycle.Regenerative cycle can be introduced HC in the exhaust.HC in the exhaust can be by OC catalysis in exothermic reaction, and this produces heat and delivery temperature (EGT) is raise.(that is, in the PM ingress EGT of) rising can make the PM burning that is trapped in the PM filter and/or decompose, and makes the PM filter regeneration thus in the OC outlet port.
Therefore, exhaust-gas treatment system can further comprise one or more HC spargers, its in the upstream of OC with HC(fuel for example) be ejected in the blast air.This can be called as " secondary injection ".Alternately, carry out the burning back by the fuel injector that uses motor and spray, exhaust-gas treatment system can be incorporated into HC in the exhaust.Traditional control system is controlled the injection of HC in the blast air based on extraction flow in PM filter regeneration process.
But, secondary injection and burning back are sprayed and are all had shortcoming.More specifically, secondary injection can cause the fuel alluvial on exhaust wall, and it is bad to make that fuel mixes with exhaust.Bad mixture may be difficult to the catalysis by OC, and this may damage OC and/or may make decline of PM filter regeneration temperature and effulent increase.On the other hand, the injection of burning back can cause fuel near (when for example, piston is positioned at the bottom centre) alluvial under the low cylinder pressure on cylinder wall.Fuel alluvial may be diluted the oil that is used for each parts in the lubricated cylinder on cylinder wall, need thus to change oil more continually and/or cause the reduction of Engine Durability.
Therefore, provide in PM filter regeneration process the system and method for controlling the ratio that secondary injection sprays with respect to the burning back based on engine operating parameter.In other words, described system and method can be realized the advantage that spray secondary injection and burning back, avoids corresponding shortcoming (as previously mentioned) simultaneously.Therefore, described system and method can be realized more effective PM filter regeneration, protects exhaust-gas treatment system parts (for example, OC, PM filter or the like) thus and/or reduces effulent.And described system and method sprays after can ordering in the cylinder the one group burning in (or row, for example a half), allows the regeneration efficiency of exhaust gas recirculatioon (EGR) with further improvement PM filter thus.
More specifically, described system and method can determine that HC sprays desired amount (that is, HC sprays total amount) based on the temperature that records at PM filter inlet place.Described system and method also can determine that HC sprays desired amount based on extraction flow and car speed.So described system and method can be controlled the ratio that secondary injection is sprayed with respect to the burning back based on engine loading and engine speed.In other words, described system and method can be determined secondary injection amount and burning back emitted dose.For example, described system and method can spray desired amount execution proportion integration differentiation (PID) control to described ratio and/or HC based on the temperature that records at PM filter inlet place.
Referring now to Fig. 1,, engine system 10 comprises CI motor 12.Only as example ground, motor 12 can be diesel engine or hcci engine.Motor 12 combustion airs/fuel (A/F) mixture is to produce driving torque.Air 16 is sucked in the intake manifold 14 by entering the mouth.Can comprise the closure (not shown), enter air mass flow in the intake manifold 14 with adjustment.Air in the intake manifold 14 is assigned in a plurality of cylinders 20.Though demonstrate six cylinders, but what can recognize is that motor 12 can comprise the cylinder of other quantity.Maf sensor 18 can be measured the speed by 16 the air stream of entering the mouth.For example, the measured value of air stream speed can be used for determining engine loading, and engine loading can be corresponding to the required total amount of fuel of burning.
Fuel injector 22 is corresponding to cylinder 20.Fuel injector 22 can inject fuel directly into (that is, directly fuel sprays) in the cylinder 20.But, alternately, fuel injector 22 can be via the air inlet port burner oil (that is port fuel injection) of cylinder 20.The piston (not shown) compresses the A/F mixture in cylinder 20, and makes the A/F mixture in cylinder 20 internal combustion.Piston at power stroke drive engine crankshaft (not shown) to produce driving torque.In one embodiment, cylinder 20 can comprise spark plug (not shown) (for example, be used for the spark of hcci engine auxiliary).Fuel injector 22 can also inject fuel into (that is, spray the burning back) in the cylinder 20 after the A/F mixture burns, so that hydrocarbon (HC) is incorporated in the exhaust.
The bent axle (not shown) is with engine speed or the speed rotation of engine speed in proportion to.Crankshaft speed (CS) sensor 24 is measured the rotational speed of bent axle.Only as example ground, CS sensor 24 can be variable-reluctance transducer.Can be sent to the power train (for example, wheel) of vehicle via the speed changer (not shown) from the driving torque of engine crankshaft.Transmission output shaft speed (TOSS) sensor 26 is measured the rotational speed of the output shaft of speed changer (not shown).In other words, can indicate car speed from the measured value of TOSS sensor 26.Yet engine speed and car speed all can use other sensor that is fit to and/or method to measure or calculate.
Exhaust due to cylinder 20 internal combustion is discharged in the gas exhaust manifold 28.The MAF of exhaust (EMAF) sensor 30 produces the EMAF signal, and it has indicated the speed of the air that flows through EMAF sensor 30.For example, the EMAF signal can indicate or be used for to determine to pass through the extraction flow of exhaust-gas treatment system 32.Thereby EMAF sensor 30 can be between gas exhaust manifold 28 and exhaust-gas treatment system 32.
Exhaust-gas treatment system 32 can be handled exhaust.Exhaust-gas treatment system 32 can comprise: auxiliary HC sparger 34, OC 36 and PM filter 40.Auxiliary HC sparger 34 is optionally with HC(fuel for example) be ejected in the blast air.But, as previously mentioned, fuel injector 22 can be carried out the burning back and spray so that HC is incorporated in the exhaust.CO and HC in the OC 36 oxidation exhausts.PM filter 40 is removed PM from exhaust.
Exhaust-gas treatment system 32 also comprises temperature transducer 37 and 39.Temperature transducer 37 can be measured the temperature (T of the exhaust in OC 36 outlet ports Out), thereby can be called as " outlet temperature sensor ".On the other hand, temperature transducer 39 can be measured the temperature (T of PM filter 40 ingress In), thereby can be called as " inlet temperature sensor ".Exhaust-gas treatment system 32 can further comprise measures delivery temperature (EGT) and/or exhaust NO respectively xOther temperature transducer (not shown) and/or NO of concentration xThe sensor (not shown).
Control module 50 is controlled with the various parts communications of engine system 10 and/or to it.Control module 50 can be from maf sensor 18, CS sensor 24, TOSS sensor 26, EMAF sensor 30, outlet temperature sensor 37 and inlet temperature sensor 39 received signals.Control module 50 also can with 40 communications of PM filter, need regenerative cycle to determine when.Alternately, control module 50 can determine that PM filter 40 needs regeneration based on other parameter and/or model.For example, when extraction flow during less than predetermined extraction flow threshold value (that is, PM filter 40 is subject to PM), control module 50 can determine that PM filter 40 needs regeneration.
Control module 50 may command: closure (not shown), fuel injector 22, auxiliary HC sparger 34 and exhaust gas recirculatioon (EGR) valve 46(be more detailed description hereinafter).Control module 50 can realize that also the system and method for present disclosure is to improve the regeneration efficiency of PM filter 40.More specifically, control module 50 actuatable fuel injector 22(promptly spray after the burning) and/or auxiliary HC sparger 34, with the regeneration of control EGT and control PM filter 40.In one embodiment, the actuatable fuel injector 22 with one group of (or row, for example a half) cylinder 20 correspondence of control module 50 is with the EGR in the regenerative process that allows PM filter 40.
Engine system 10 can further comprise: egr system 42.Egr system 42 comprises EGR valve 46 and EGR pipeline 44.Egr system 42 can be incorporated into a part of exhaust the intake manifold 14 from gas exhaust manifold 28.EGR valve 46 can be installed on the intake manifold 14.EGR pipeline 44 can extend to EGR valve 46 from gas exhaust manifold 28, is communicated with thereby provide between gas exhaust manifold 28 and EGR valve 46.As previously mentioned, control module 50 actuatable EGR valves 46 are in order to increase and to reduce the amount that is introduced in the exhaust in the intake manifold 14.
Motor 12 also can comprise turbosupercharger 48.Turbosupercharger 48 can be by the exhaust gas drive that receives by the turbine inlet.Only as example, turbosupercharger 48 can comprise variable nozzle turbine.Turbosupercharger 48 has increased the air stream that enters into intake manifold 14, thereby makes air inlet MAP(promptly, manifold absolute pressure, or boost pressure) increase.Control module 50 actuatable turbosupercharger 48 are controlled boost pressure thus optionally to limit the flow of exhaust.
Referring now to Fig. 2,, it shows control module 50 in greater detail.Control module 50 can comprise: spray determination module 60, spray distribution module 70 and regeneration control module 80.Spray determination module 60 and receive extraction flow and car speed.For example, extraction flow can be measured by EMAF sensor 30, and car speed can be measured by TOSS sensor 26.But, extraction flow and car speed all can use other sensor measurement or based on the engine operating parameter modeling.Spray determination module 60 and also receive temperature T In(measuring) by inlet temperature sensor 39.
Spray determination module 60 based on temperature T InDetermine that HC sprays desired amount (that is, HC sprays total amount).Spray determination module 60 and also can determine HC injection desired amount based in extraction flow and the car speed at least one.And, in one embodiment, spray determination module 60 based on Temperature Feedback (that is T, In) carry out the PID control of HC being sprayed desired amount.For example, spray determination module 60 and can comprise question blank, question blank comprises that a plurality of HCs relevant with each inlet temperature, extraction flow and/or the car speed of PM filter 40 spray desired amount.Only as example, HC sprays desired amount and can reduce with the extraction flow increase.Alternately, only as example, HC sprays desired amount can be in temperature T InDo not increase or increased when slow and increase.
Spray distribution module 70 receives HC and sprays desired amount.Spray distribution module 70 also receives engine speed and engine loading.For example, engine speed can use CS sensor 22 to measure, and engine loading can use maf sensor 18 to measure.But, engine speed and engine loading can use other sensor measurement or based on the engine operating parameter modeling.Spray distribution module 70 is sprayed desired amount, engine speed and engine loading based on HC and is determined secondary injection amount and burning back emitted dose.More specifically, spray distribution module 70 can be determined the ratio that secondary injection is sprayed with respect to the burning back.So can spraying desired amount and determined ratio based on HC, spray distribution module 70 determines secondary injection amount and burning back emitted dose.For example, spray distribution module 70 can comprise question blank, and described question blank comprises a plurality of ratios relevant with engine speed and engine loading.
Regeneration control module 80 receives determined secondary injection amount and burning back emitted dose (being respectively AUX and PC).Regeneration control module 80 is controlled auxiliary HC sparger 34 and fuel injector 22 respectively based on determined secondary injection amount and burning back emitted dose.But, alternately, in one embodiment, spray distribution module 70 can be determined the ratio that secondary injection is sprayed with respect to the burning back, and regeneration control module 80 can be controlled auxiliary HC sparger 34 and fuel injector 22 respectively according to determined ratio.
Regeneration control module 80 can be respectively applied for the control signal of assisting HC sparger 34 and fuel injector 22 by generation and control secondary injection and the injection of burning back.But, as previously mentioned, among the embodiment, regeneration control module 80 can generate the used control signal of the fuel injector related with one group of (or one row) cylinder 20 22, with the EGR in the regenerative process that allows PM filter 40.Though only demonstrate a regeneration control module 80, but, can realize that two separate modules are to control secondary injection and the injection of burning back respectively.
Referring now to Fig. 3,, it shows out the exemplary of spray distribution module 70 in greater detail.Spray distribution module 70 can comprise rate determination block 90.Rate determination block 90 receives engine loading and engine speed.Rate determination block 90 is determined the ratio that secondary injection is sprayed with respect to the burning back.For example, rate determination block 90 can generate factor (for example between 0 and 1).Spray distribution module 70 can be sprayed HC desired amount and be multiply by described factor to determine burning back emitted dose.Spray distribution module 80 can be sprayed determined burning back emitted dose then and be deducted the desired amount to determine the secondary injection amount from HC.
Referring now to Fig. 4,, figure line has wherein shown the illustration according to the EGT control that is used for the vehicle of advancing with 75 miles per hours (mph) of the system and method for present disclosure.More particularly, described figure line example shows and is using 50% secondary injection and 50% burning back to spray EGT control in the PM filter regeneration process of (that is the ratio of 1:1).As shown in the figure, in the temperature T of PM filter 40 ingress InIn whole regenerative process, accurately follow all the time desired temperature ladder (for example, 565 ℃, 585 ℃, or the like).Can make the efficient in the PM filter regeneration process improve to accurately following of desired temperature ladder.
Referring now to Fig. 5,, is used for controlling the method that HC is ejected into the exhaust that is produced by motor 12 and starts from 100.In 100, control module 50 determines whether motor 12 starts.In this way, then control can proceed to 104.As not, then control and to return 100.In 104, control module 50 can determine whether PM filter 40 needs regeneration.For example, PM filter 40 may need regeneration during less than predetermined threshold at extraction flow.In this way, then control can proceed to 108.As not, then control and to return 104.
In 108, control module 50 can determine that HC sprays desired amount.In 112, control module 50 can determine to assist (AUX) to spray the ratio that sprays with respect to burning back (PC).For example, control module 50 can use question blank to determine factor, and described question blank comprises a plurality of factors relevant with engine loading and engine speed.
In 116, control module 50 can be sprayed desired amount and determined ratio (or factor) based on HC and be determined auxiliary (AUX) emitted dose and burning back (PC) emitted dose.For example, control module 50 can be determined auxiliary (AUX) emitted dose based on the product that described factor and HC spray desired amount, and emitted dose after can determining to burn based on the difference that HC sprays desired amount and determined secondary injection amount.
In 120, control module 50 can be sprayed according to determined secondary injection amount and burning back emitted dose control HC.In 124, control module 50 can be measured the temperature T of PM filter 40 ingress In
In 128, control module 50 can determine whether regenerative operation is finished.For example, at inlet temperature T InMore than or equal to predetermined temperature threshold and when having continued scheduled time slot, regenerative operation can be finished.In this way, then control can return 104.As not, so then control can return 108, in 108, can continue to control HC injection desired amount and secondary injection with respect to the ratio that sprays after burning (for example PID control), finish up to regenerative operation.
The broad sense teaching of present disclosure can be implemented according to various forms.Therefore, though present disclosure comprises concrete example, but the true scope of present disclosure should be not limited thereto, this be because, to those skilled in the art, by research accompanying drawing, specification and appended claims, it is obvious that other modification will become.

Claims (10)

1. engine control system comprises:
Spray determination module, it determines to be ejected in the exhaust that is produced by motor the desired amount with the hydrocarbon HC that carries out particulate matter PM filter regeneration; With
The spray distribution module, it sprays the ratio that desired amount control secondary injection is sprayed with respect to the burning back based on engine loading, engine speed and described HC, wherein, secondary injection comprises HC is ejected in the described exhaust, and wherein the burning back is sprayed in the period that is included in after the burning HC is ejected in the cylinder of described motor.
2. engine control system as claimed in claim 1, wherein, described spray distribution module is sprayed desired amount based on described engine loading, described engine speed and described HC and is determined secondary injection amount and burning back emitted dose.
3. engine control system as claimed in claim 2 further comprises:
Regeneration control module, it generates the control signal that is used for auxiliary HC sparger and fuel injector based on described secondary injection amount and burning back emitted dose respectively.
4. engine control system as claimed in claim 3, wherein, described auxiliary HC sparger is arranged in the upstream of the oxidation catalyst OC of exhaust-gas treatment system, and wherein said fuel injector is corresponding to the cylinder of described motor.
5. engine control system as claimed in claim 4, wherein, described regeneration control module generate with described cylinder in one group of control signal that corresponding fuel injector is used.
6. engine control system as claimed in claim 2, wherein, described spray distribution module uses question blank to determine that factor, described question blank comprise a plurality of factors relevant with engine loading and engine speed.
7. engine control system as claimed in claim 6, wherein, described spray distribution module is determined described secondary injection amount based on the product of described factor and described HC injection desired amount, and wherein said spray distribution module is determined described burning back emitted dose based on the difference that described HC sprays desired amount and determined secondary injection amount.
8. engine control system as claimed in claim 1, wherein, described injection determination module determines that in the temperature of the ingress of described PM filter described HC sprays desired amount based on described exhaust.
9. engine control system as claimed in claim 8, wherein, described injection determination module determines to be ejected into the desired amount of the HC in the described exhaust based in extraction flow and the car speed at least one.
10. method comprises:
Determine to be ejected in the exhaust that produces by motor desired amount with the hydrocarbon HC that carries out particulate matter PM filter regeneration; With
Spray desired amount based on engine loading, engine speed and described HC and control the ratio that secondary injection is sprayed with respect to the burning back, wherein, secondary injection comprises HC is ejected in the described exhaust, and wherein the burning back is sprayed in the period that is included in after the burning HC is ejected in the cylinder of described motor.
CN2011101138617A 2010-05-04 2011-05-04 Control system and method for improved efficiency of particulate matter filter regeneration Pending CN102235216A (en)

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Application publication date: 20111109