CN107288765A - Variable boost engine EGR rate feedback based on inlet air flow gauge information - Google Patents

Variable boost engine EGR rate feedback based on inlet air flow gauge information Download PDF

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Publication number
CN107288765A
CN107288765A CN201710722232.1A CN201710722232A CN107288765A CN 107288765 A CN107288765 A CN 107288765A CN 201710722232 A CN201710722232 A CN 201710722232A CN 107288765 A CN107288765 A CN 107288765A
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real
time
load
egr valve
crank
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CN201710722232.1A
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Chinese (zh)
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江涛
林学东
李德刚
杨淼
史乃晨
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Jilin University
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Jilin University
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Publication of CN107288765A publication Critical patent/CN107288765A/en
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    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • F02D41/0052—Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
    • 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
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • 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
    • 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
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/0065—Specific aspects of external EGR control
    • F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
    • F02D2041/0075—Estimating, calculating or determining the EGR rate, amount or flow by using flow sensors
    • 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
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
    • 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
    • F02D2200/04—Engine intake system parameters
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/101—Engine speed

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

The invention provides a kind of variable boost engine EGR rate feedback based on inlet air flow gauge information：Step 1: inquiry benchmark charge flow rate arteries and veins spectrum and target EGR rate arteries and veins spectrum obtain benchmark charge flow rate and target EGR rate；Step 2: the basic aperture arteries and veins spectrum of inquiry EGR valve obtains EGR valve aperture basic value；Step 3: calculating the target induction flow of engine fresh air, the actual charge flow rate of engine fresh air is measured, the charge flow rate deviation of engine fresh air is calculated；Step 4: inquiry EGR valve amendment aperture arteries and veins spectrum obtains the correction value of EGR valve aperture；Step 5: the correction value sum of the basic value of EGR valve aperture and EGR valve aperture is the desired value of EGR valve aperture；Step 6: measuring the actual value of EGR valve aperture, the actual value of EGR valve aperture is adjusted with EGR valve PID controller, is allowed to consistent with the desired value of EGR valve aperture；This method ensure that on the basis of the fast-response of egr system, it is ensured that the uniformity of actual EGR rate and target EGR rate.

Description

Variable boost engine EGR rate feedback based on inlet air flow gauge information
Technical field
The invention belongs to the control field of combustion engine, it is related to a kind of variable boost hair based on inlet air flow gauge information Motivation EGR rate feedback, and in particular to a kind of when coupling control with EGR using VNT and causing air-suction state to change, base The feedback control strategy for accurately controlling engine EGR rate with correcting EGR valve aperture is calculated in inlet air flow gauge actual information.
Background technology
EGR (Exhaust Gas Recirculation, waste gas recycling, hereinafter referred to as EGR) system, will by pipeline A part of waste gas is re-introduced into cylinder, thus reaches the purpose for reducing engine nox emission.VNT(Variable Nozzle Turbo variable boosts, hereinafter referred to as VNT) in normal conditions, the main component in waste gas is not involved in burning Inert gas, engine cylinder is introduced by a portion, can be produced the effect in terms of three below and be promoted discharged nitrous oxides Reduction：(1) the Main Ingredients and Appearance in EGR gas is the inert gases such as carbon dioxide, nitrogen, can play oxygen in dilution cylinder The effect of concentration；(2) the specific heat ratio fresh air of waste gas is big, can reduce in-cylinder combustion temperature；(3) the inert gas in waste gas Burn rate can be reduced.
EGR technology has obtained general as the maximally efficient technical measures of current reduction discharged nitrous oxides in European and American areas All over application, egr system is also equipped with China's major part Medium or severe type diesel engine.The appropriate EGR rate of size contributes to engine simultaneous Dynamic property and emission performance are turned round and look at, if EGR rate is excessive, can burn deterioration, influence the dynamic property and economy of engine, or even emit black Cigarette；If EGR rate is not enough, it can cause to discharge too high adverse consequences.Therefore, accurately control EGR rate and seem extremely important.
It is increasingly strict with Abgasgesetz, it is equipped with variable-area turbocharger (VGS) simultaneously on vehicular engine Normality is had become with egr system.In engine operation process, the coupling of VGS and egr system, not only influence is started The admission pressure and pressure at expulsion of machine, while influenceing the accurate control of EGR rate.Traditional control method is only capable of accurately controlling EGR The opening value of valve, when being influenceed admission pressure and the pressure at expulsion to change by turbocharger in real work, current EGR rate needed under operating condition corresponding to EGR valve aperture can also change, it is difficult to realize the accurate control to EGR rate, shadow Ring the combination property of engine.Increasingly strict with Abgasgesetz, accurate control EGR rate is particularly important, a kind of perfect The accurate control strategy of EGR rate be very necessary.
The content of the invention
There is provided one for the problem of present invention is solves to be difficult to accurately control EGR rate under the conventional operating mode of variable boost engine Plant the engine EGR rate feedback based on inlet air flow gauge information.
In order to solve the above-mentioned technical problem, technical scheme is as follows：
EGR rate feedback with correcting EGR valve aperture is calculated based on inlet air flow gauge information, it is characterised in that Comprise the following steps that：
Step one：The real-time rotating speed N of engine is measured according to dynamometer machinecrankAnd Real-time Load Load inquires about the engine Real-time rotating speed N is based in ECUcrankAnd Real-time Load Load target EGR rate arteries and veins spectrum and benchmark charge flow rate arteries and veins spectrum, needed for obtaining Based on real-time rotating speed NcrankAnd Real-time Load Load target EGR rate ηEGRAnd based on real-time rotating speed NcrankAnd Real-time Load Load benchmark charge flow rate q0；
Step 2：According to the real-time rotating speed N of enginecrankAnd Real-time Load Load is inquired about in the Engine ECU based on real When rotating speed NcrankWith the Real-time Load Load basic aperture arteries and veins spectrum of EGR valve, obtain being based on real-time rotating speed NcrankAnd Real-time Load The basic value D of Load EGR valve aperturebasis；
Step 3：Calculate and real-time rotating speed N is based under actual conditioncrankAnd Real-time Load Load engine fresh air Target induction flow qFair1, qFair1=q0×(1-ηEGR), measured using the intake flow sensor on motor intake manifold Based on real-time rotating speed NcrankAnd the actual charge flow rate q of Real-time Load Load engine fresh airFair2, calculate and be based on Real-time rotating speed NcrankAnd the charge flow rate deviation q of Real-time Load Load engine fresh airFair3, qFair3=qFair2- qFair1；
Step 4：According to the real-time rotating speed N of enginecrankAnd qFair3Inquiry is based on real-time rotating speed in Engine ECU NcrankAnd qFair3EGR valve amendment aperture arteries and veins spectrum, obtain be based on real-time rotating speed Ncrank, Real-time Load Load and qFair3EGR valve The correction value D of aperturecor；
Step 5：Based on real-time rotating speed NcrankAnd the basic value D of Real-time Load Load EGR valve aperturebasisWith based on reality When rotating speed Ncrank, Real-time Load Load and qFair3EGR valve aperture correction value DcorSum is based on real-time rotating speed NcrankAnd The desired value D of Real-time Load Load EGR valve aperturetarget, i.e. Dtarget=Dbasis+Dcor；
Step 6：Measured using EGR valve position sensor based on real-time rotating speed NcrankAnd Real-time Load Load EGR valve is opened The actual value D of degreeactual, EGR valve PID controller is according to based on real-time rotating speed NcrankAnd Real-time Load Load EGR valve aperture Desired value DtargetWith based on real-time rotating speed NcrankAnd the actual value D of Real-time Load Load EGR valve apertureactualDifference DdevReally Determine controlled quentity controlled variable, and pass to direct current generator EGR valve, adjust Dactual, it is allowed to and DtargetIt is consistent, wherein Ddev=Dtarget- Dactual。
Compared with the control technology of the accurate control EGR valve aperture of existing EGR valve feedback control, the present invention has to be changed as follows Kind effect：On the basis of the fast-response of egr system is ensure that using the basic value of EGR valve aperture, based on inlet air flow gauge The control method of information feedback control EGR valve aperture is by step 4, step 5 and step 6, using charge flow rate to EGR valve The amendment of aperture, it is to avoid due to EGR rate fluctuation that the fluctuation of charge flow rate is produced under identical EGR apertures, it is ensured that actual EGR The uniformity of rate and target EGR rate, realizes the accurate control of EGR rate.
Brief description of the drawings：
EGR control module principle schematic in Fig. 1 automobile engines；
Fig. 2 is the variable boost engine EGR rate feedback of the present invention based on inlet air flow gauge information Flow chart；
Fig. 3 be variable boost engine EGR rate feedback based on inlet air flow gauge information described in invention with The actual effect comparison schematic diagram of existing control strategy.
Embodiment
The present invention is elaborated below in conjunction with the accompanying drawings：
In order to introduce present disclosure in detail, some related notions are defined：
Define one, benchmark charge flow rate：Under a certain operating mode, when EGR valve is closed, after demarcation VNT apertures, into engine vapour All gas flow in cylinder, uses q0To represent；
Define the two, target induction flow of fresh air：Refer to the new charge that current working is issued to needed for target EGR rate Flow, uses q hereinFair1To represent；
Define three, the actual charge flow rate of fresh air：Refer to and intake flow sensor meter is utilized under engine current working The actual fresh charge flow rate of calculation, uses q hereinFair2To represent；
Define four, charge flow rate deviation：Refer to the actual charge flow rate of engine fresh air and the difference of target induction flow, Use q hereinFair3To represent.
Referring to the drawings 1, the engine target EGR rate feedback of the present invention based on inlet air flow gauge information Comprise the following steps：
Step one：The real-time rotating speed N of engine is measured according to dynamometer machinecrank=2282r/min and Real-time Load Load= 60% inquiry is based on real-time rotating speed NcrankAnd the target EGR rate arteries and veins spectrum and benchmark inlet air flow of Real-time Load Load EGR valve aperture Measure arteries and veins spectrum, obtain needed for based on real-time rotating speed NcrankAnd Real-time Load Load target EGR rate ηEGR=10% and based on real-time Rotating speed NcrankAnd Real-time Load Load benchmark charge flow rate q0=71.1g/s；
Step 2：According to the real-time rotating speed N of enginecrank=2282r/min and Real-time Load Load=60% inquiries should EGR valve basis aperture arteries and veins spectrum in the Engine ECU of this in Engine ECU, obtains being based on real-time rotating speed NcrankAnd Real-time Load Load EGR valve aperture basic value Dbasis=27%；
Step 3：Calculate and real-time rotating speed N is based under corresponding operating modecrankAnd Real-time Load Load engine fresh air Target induction flow qFair1, qFair1=q0×(1-ηEGR)=63.99g/s, utilizes the charge flow rate on motor intake manifold Sensor is measured based on real-time rotating speed NcrankAnd the actual charge flow rate q of Real-time Load Load engine fresh airFair2= 67.24g/s, is calculated based on real-time rotating speed NcrankAnd the charge flow rate deviation of Real-time Load Load engine fresh air qFair3,qFair3=qFair2-qFair1=3.25g/s；
Step 4：According to the real-time rotating speed N of enginecrank=2282r/min and Real-time Load Load=60% and base In real-time rotating speed NcrankAnd the charge flow rate deviation q of Real-time Load Load engine fresh airFair3=3.25g/s deviations Inquiry is based on real-time rotating speed NcrankAnd qFair3EGR valve amendment aperture arteries and veins spectrum, obtain be based on real-time rotating speed Ncrank, Real-time Load Load and qFair3EGR valve aperture correction value Dcor=2%；
Step 5：Based on real-time rotating speed NcrankAnd the basic value D of Real-time Load Load EGR valve aperturebasisWith based on reality When rotating speed Ncrank, Real-time Load Load and qFair3EGR valve aperture correction value DcorSum is based on real-time rotating speed NcrankAnd The desired value D of Real-time Load Load EGR valve aperturetarget, i.e. Dtarget=Dbasis+Dcor=29%；
Step 6：Measured using EGR valve position sensor based on real-time rotating speed NcrankAnd Real-time Load Load EGR valve is opened The actual value D of degreeactual=16%, EGR valve PID controller is according to based on real-time rotating speed NcrankAnd Real-time Load Load EGR valve The desired value D of aperturetarget=29% and Dactual=16% difference DdevDetermine controlled quentity controlled variable, Ddev=Dtarget-Dactual=13%, And direct current generator EGR valve is passed to, adjust Dactual, it is allowed to and DtargetIt is consistent.
Note：Above-mentioned steps are the process performed repeatedly, as the actual aperture D of EGR valveactualChange causes the reality of fresh air Border charge flow rate qFair2When changing, the correction value D of EGR valve aperture may result incorChange, to ensure the standard of EGR rate True property.

Claims (1)

1. the variable boost engine EGR rate feedback based on inlet air flow gauge information, it is characterised in that specific steps It is as follows：
Step one：The real-time rotating speed N of engine is measured according to dynamometer machinecrankAnd Real-time Load Load is inquired about in the Engine ECU Based on real-time rotating speed NcrankAnd Real-time Load Load target EGR rate arteries and veins spectrum and benchmark charge flow rate arteries and veins spectrum, obtain required base In real-time rotating speed NcrankAnd Real-time Load Load target EGR rate ηEGRAnd based on real-time rotating speed NcrankAnd Real-time Load Load Benchmark charge flow rate q0；
Step 2：According to the real-time rotating speed N of enginecrankAnd Real-time Load Load is inquired about in the Engine ECU based on real-time turn Fast NcrankWith the Real-time Load Load basic aperture arteries and veins spectrum of EGR valve, obtain being based on real-time rotating speed NcrankAnd Real-time Load Load The basic value D of EGR valve aperturebasis；
Step 3：Calculate and real-time rotating speed N is based under actual conditioncrankAnd the mesh of Real-time Load Load engine fresh air Mark charge flow rate qFair1, qFair1=q0×(1-ηEGR), measured and be based on using the intake flow sensor on motor intake manifold Real-time rotating speed NcrankAnd the actual charge flow rate q of Real-time Load Load engine fresh airFair2, calculate based on real-time Rotating speed NcrankAnd the charge flow rate deviation q of Real-time Load Load engine fresh airFair3, qFair3=qFair2-qFair1；
Step 4：According to the real-time rotating speed N of enginecrankAnd qFair3Inquiry is based on real-time rotating speed N in Engine ECUcrankAnd qFair3EGR valve amendment aperture arteries and veins spectrum, obtain be based on real-time rotating speed Ncrank, Real-time Load Load and qFair3EGR valve aperture Correction value Dcor；
Step 5：Based on real-time rotating speed NcrankAnd the basic value D of Real-time Load Load EGR valve aperturebasisWith being turned based on real-time Fast Ncrank, Real-time Load Load and qFair3EGR valve aperture correction value DcorSum is based on real-time rotating speed NcrankAnd in real time The desired value D of load Load EGR valve aperturetarget, i.e. Dtarget=Dbasis+Dcor；
Step 6：Measured using EGR valve position sensor based on real-time rotating speed NcrankAnd Real-time Load Load EGR valve aperture Actual value Dactual, EGR valve PID controller is according to based on real-time rotating speed NcrankAnd the target of Real-time Load Load EGR valve aperture Value DtargetWith based on real-time rotating speed NcrankAnd the actual value D of Real-time Load Load EGR valve apertureactualDifference DdevIt is determined that control Amount processed, and direct current generator EGR valve is passed to, adjust Dactual, it is allowed to and DtargetIt is consistent, wherein Ddev=Dtarget-Dactual。
CN201710722232.1A 2017-08-22 2017-08-22 Variable boost engine EGR rate feedback based on inlet air flow gauge information Pending CN107288765A (en)

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Cited By (6)

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CN108150315A (en) * 2017-12-29 2018-06-12 潍柴动力股份有限公司 EGR exhaust processing unit and automobile
CN110552799A (en) * 2019-09-20 2019-12-10 潍柴动力股份有限公司 Exhaust gas recirculation control method and device
CN111006867A (en) * 2019-11-26 2020-04-14 广西玉柴机器股份有限公司 Calibration method of engine air intake correction map table and air intake correction method
CN112594071A (en) * 2020-12-08 2021-04-02 安徽江淮汽车集团股份有限公司 EGR valve control method, control device and computer readable storage medium
CN113685280A (en) * 2020-05-19 2021-11-23 广州汽车集团股份有限公司 Control method and device for EGR rate
CN114962026A (en) * 2022-05-09 2022-08-30 潍柴动力股份有限公司 Method and device for correcting set value of intake air flow, electronic device, and storage medium

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108150315A (en) * 2017-12-29 2018-06-12 潍柴动力股份有限公司 EGR exhaust processing unit and automobile
CN110552799A (en) * 2019-09-20 2019-12-10 潍柴动力股份有限公司 Exhaust gas recirculation control method and device
CN111006867A (en) * 2019-11-26 2020-04-14 广西玉柴机器股份有限公司 Calibration method of engine air intake correction map table and air intake correction method
CN113685280A (en) * 2020-05-19 2021-11-23 广州汽车集团股份有限公司 Control method and device for EGR rate
CN113685280B (en) * 2020-05-19 2022-11-25 广州汽车集团股份有限公司 EGR rate control method and device
CN112594071A (en) * 2020-12-08 2021-04-02 安徽江淮汽车集团股份有限公司 EGR valve control method, control device and computer readable storage medium
CN114962026A (en) * 2022-05-09 2022-08-30 潍柴动力股份有限公司 Method and device for correcting set value of intake air flow, electronic device, and storage medium

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