CN112523878A - EGR valve closed-loop control method based on EGR rate - Google Patents

EGR valve closed-loop control method based on EGR rate Download PDF

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CN112523878A
CN112523878A CN202011247294.XA CN202011247294A CN112523878A CN 112523878 A CN112523878 A CN 112523878A CN 202011247294 A CN202011247294 A CN 202011247294A CN 112523878 A CN112523878 A CN 112523878A
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egr
egrerr
egr rate
target
pct
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CN112523878B (en
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秦龙
刘磊
张凡武
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Dongfeng Motor Corp
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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]
    • F02D41/0077—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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the 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
    • F02D41/14—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
    • 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
    • F02D2041/141—Introducing closed-loop corrections characterised by the control or regulation method using a feed-forward control element
    • 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

Abstract

The invention discloses an EGR valve closed-loop control method based on an EGR rate, which comprises the following steps: s1, when the EGR is in the non-activated state, the opening degree of the target EGR valve is 0%; s2, when the EGR is in the activated state, acquiring a target EGR rate and an actual EGR rate; s3, the feed-forward part and the PI control part obtain the EGR valve target opening degree. In the closed-loop control process, the opening degree of the EGR valve is adjusted according to the target EGR rate and the actual EGR rate, instead of adjusting the control of the EGR valve according to the target EGR valve opening degree and the actual EGR valve opening degree, so that the actual EGR rate can be controlled fundamentally; particularly, the I term considers integral saturation in the closed-loop control process so as to improve the control accuracy of the EGR rate, particularly in the case of the change of the EGR valve direction.

Description

EGR valve closed-loop control method based on EGR rate
Technical Field
The invention belongs to the technical field of engines, and particularly relates to an EGR valve closed-loop control method based on an EGR rate.
Background
With the rapid development of the automobile and internal combustion engine industry, the problems of energy demand and environmental protection become difficult problems in all countries in the world at present, so that energy conservation and emission reduction become two major topics for the development of the internal combustion engine industry. In the aspect of energy conservation, automobile manufacturers at home and abroad use the following components: the technology of Otto (Otto) circulation, Atkinson (Atkinson) circulation, Miller (Miller) circulation, high-pressure Exhaust Gas Recirculation (EGR) or low-pressure high-pressure Exhaust Gas Recirculation and the like improves the combustion work-doing process of the engine, or reduces the pumping loss of medium and small loads through the miniaturization design of the engine, and improves the fuel economy of the traditional gasoline engine.
Turbocharged engines may include Exhaust Gas Recirculation (EGR), which may take exhaust gas from the exhaust gas into the intake system. Research shows that the EGR system has certain advantages in improving emission, reducing oil consumption and improving anti-knock capability. In EGR control, the control of a reasonable and effective EGR control valve directly influences the effect of final EGR control.
The control purpose of the EGR control valve is to request the opening amount of the EGR control valve to actually follow the target EGR rate based on the target EGR rate and the actual EGR rate. However, currently, control for the EGR control valve is not satisfactory, and it is not possible to make the actual EGR rate follow the target EGR rate.
Disclosure of Invention
The invention aims to provide an EGR valve closed-loop control method based on an EGR rate, and solves the problem that the actual EGR rate cannot follow a target EGR rate in the conventional EGR valve control.
The invention provides an EGR valve closed-loop control method based on an EGR rate, which comprises the following steps:
s1, when the EGR is in the non-activated state, the opening degree of the target EGR valve is 0%;
s2, when the EGR is in the activated state, acquiring a target EGR rate and an actual EGR rate;
s3, obtaining the target opening degree of the EGR valve by the feedforward part and the PI control part;
wherein, the target opening of the feedforward part is 0 or calculated by open loop control;
the PI control part target opening degree comprises a P item and an I item; wherein, the P term PctValveDsrdPThe calculation formula is as follows:
PctValveDsrdP＝fp(rEGRDesrd，rEGRErr)×rEGRErr
in the formula, rEGRDesrdIs a target EGR rate, rEGRErrIs the difference between the target EGR rate and the actual EGR rate, fp(rEGRDesrd，rEGRAct) A correction factor for P items, represented by rEGRErrAnd target EGR rate determination;
term I PctValveDsrdIThe calculation formula is as follows:
PctValveDsrdI＝fI(drEGRErr，rEGRErr)×Δt×(rEGRErr-KWindUpGain×PctSaturateOld)+PctValveDsrdIOld
in the formula, drEGRErrIs rEGRErrRate of change of fI(drEGRErr，rEGRErr) Correction factor for I accumulated item, by drEGRErrAnd rEGRErrDetermining that Δ t is the sampling period, KWindUpGainTo inversely integrate the saturation correction factor, PctSaturateOldSaturated opening of EGR valve for the previous sampling period, PctValveDsrdIOldIs the I term of the last sampling period;
s4, limiting the target opening degree of the EGR valve between the minimum value and the maximum value to obtain the final target opening degree of closed-loop control; wherein the target opening degree maximum value takes the smaller of the maximum value determined based on the engine speed and the load and the maximum value determined based on the ratio of the EGR control valve outlet gas pressure to the inlet gas pressure.
Further, the target EGR rate is obtained by determining the EGR rate on the engine platform according to the engine speed and the load and correcting according to the actual working condition of the engine.
Further, the actual EGR rate is calculated from the exhaust gas flow rate of the EGR valve or obtained by using a table look-up.
Further, the target opening degree minimum value is 0.
The invention has the beneficial effects that: in the closed-loop control process, the opening degree of the EGR valve is adjusted according to the target EGR rate and the actual EGR rate, instead of adjusting the control of the EGR valve according to the target EGR valve opening degree and the actual EGR valve opening degree, so that the actual EGR rate can be controlled from the root; particularly, the I term considers integral saturation in the closed-loop control process so as to improve the control accuracy of the EGR rate, particularly in the case of the change of the EGR valve direction.
Drawings
FIG. 1 is a flow chart of an EGR valve closed-loop control method based on EGR rate of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
the control purpose of the EGR control valve is to request the opening degree of the EGR control valve based on the target EGR rate and the actual EGR rate, to achieve that the actual EGR rate follows the target EGR rate.
The EGR valve closed-loop control method based on the EGR rate of the embodiment of the invention, as shown in FIG. 1, comprises the following steps:
s1, when the EGR is not in the activated state, the target EGR valve opening degree is 0%.
S2, when EGR is in activated state, obtaining target EGR rate rEGRDesrdWith the actual EGR rate rEGRAct。
Target EGR Rate rEGRDesrdThe target EGR rate can be determined on an engine bench according to the engine speed and the load, and the final target EGR rate r can be obtained by correcting the target EGR rate according to the actual working condition of the engineEGRDesrdOr data directly imported after being calculated and processed by a third party. Actual EGR Rate rEGRActExhaust gas flow rate that may be based on an EGR valve
Figure BDA0002770457780000032
The calculated exhaust gas flow of the EGR valve can be obtained by a sensor or a prediction method, and the accurate actual EGR rate r can be obtained by calculation or direct table look-up after the exhaust gas flow of the EGR valve is obtainedEGRAct。
S3, control of target EGR Rate may employ a feed-forward portion PctValveDsrdFF+ PI control method PctValveDsrdP+PctValveDsrdIAnd further, the target opening degree of the EGR valve is obtained. The target opening degree calculated by the feedforward part can be 0, and the target opening degree calculated by open-loop control can also be adopted.
Wherein, the P term: pctValveDsrdP＝fp(rEGRDesrd，rEGRErr)×rEGRErr
In the formula, rEGRErrIs a target EGR rate rEGRDesrdWith the actual EGR rate rEGRActA difference of (d); f. ofp(rEGRDesrd，rEGRAct) The P correction factors are shown in Table 1 as rEGRErrAnd a target EGR rate determination.
TABLE 1P item correction factor determination Table
Figure BDA0002770457780000031
Adding the I term accumulation term to the I term value Pct of the last sampling period to obtain the I term value Pct of the current sampling periodValveDsrdI. The I items are added as follows: f. ofI(drEGRErr，rEGRErr)×Δt×(rEGRErr-KWindUpGain×PctSaturateOld). In the formula, Δ t is a sampling period, which is 10ms in this example; drEGRErrIs rEGRErrThe rate of change of (c); kWindUpGainTo reverse the integral saturation correction factor, the present example takes 0.00006 in order to prevent integral saturation; f. ofI(drEGRErr，rEGRErr) Factor is corrected for the I term accumulated term, as shown in Table 2 by drEGRErrAnd rEGRErrAnd (4) determining. PctSaturateOldEGR valve saturation opening for the last sample period, which is equal to KWindUpGainActing cooperatively to avoid integral saturation. The EGR valve saturation opening degree calculation mode is as follows:
PctSaturate＝PctValveDsrdFF+PctValveDsrdP+PctValveDsrdI-PctValveDsrdFinal，PctSaturateOldpct of last sampling periodSaturateI.e. PctSaturateOld(n+1)＝PctSaturate(n)
TABLE 2I term correction factor determination table
Figure BDA0002770457780000041
S4, mixing PctValveDsrdFF+PctValveDsrdP+PctValveDsrdIIs limited to a minimum value PctValveMinAnd a maximum value PctValveMaxWithin the target opening degree Pct of closed-loop control is finally obtainedValveDsrdFinalThat is, if the final result exceeds the range, the end of the range closest to the final result is substituted for the final result. Minimum value PctValveMinIn this example, take 0, the maximum value PctValveMaxRatio of maximum value determined based on engine speed and load to outlet gas pressure to inlet gas pressure based on EGR control valve
Figure RE-GDA0002906933420000042
The determined maximum values jointly determine: maximum value
Figure RE-GDA0002906933420000043
At different engine speeds nEngTesting the maximum EGR valve opening degree under rho, and when the opening degree exceeds the maximum value, the flow of the EGR control valve cannot be increased no matter how the EGR control valve is continuously opened; in addition according to
Figure RE-GDA0002906933420000044
The purpose of limiting the maximum EGR control valve opening is to avoid the phenomenon of EGR gas diversion when the EGR control valve outlet gas pressure approaches or exceeds the EGR control valve inlet gas pressure.
Up to this point, the EGR control valve opening degree based on the EGR rate is determined.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.

Claims (4)

1. An EGR valve closed-loop control method based on an EGR rate is characterized by comprising the following steps:
s1, when the EGR is in the non-activated state, the opening degree of the target EGR valve is 0%;
s2, when the EGR is in the activated state, acquiring a target EGR rate and an actual EGR rate;
s3, obtaining the target opening degree of the EGR valve by the feedforward part and the PI control part;
wherein, the target opening of the feedforward part is 0 or calculated by open loop control;
the PI control part target opening degree comprises a P item and an I item; wherein, the P term PctValveDsrdPThe calculation formula is as follows:
PctValveDsrdP＝fp(rEGRDesrd，rEGRErr)×rEGRErr
in the formula, rEGRDesrdIs a target EGR rate, rEGRErrIs the difference between the target EGR rate and the actual EGR rate, fp(rEGRDesrd，rEGRAct) A correction factor for P items, represented by rEGRErrAnd target EGR rate determination;
term I PctValveDsrdIThe calculation formula is as follows:
PctValveDsrdI＝fI(drEGRErr，rEGRErr)×Δt×(rEGRErr-KWindUpGain×PctSaturateOld)+PctValveDsrdIOld
in the formula, drEGRErrIs rEGRErrRate of change of fI(drEGRErr，rEGRErr) Correction factor for I accumulated item, by drEGRErrAnd rEGRErrDetermining that Δ t is the sampling period, KWindUpGainTo inversely integrate the saturation correction factor, PctSaturateOldSaturated opening of EGR valve for the previous sampling period, PctValveDsrdIOldIs the I term of the last sampling period;
s4, limiting the target opening degree of the EGR valve between the minimum value and the maximum value to obtain the final target opening degree of closed-loop control; wherein the target opening degree maximum value takes the smaller of the maximum value determined based on the engine speed and the load and the maximum value determined based on the ratio of the EGR control valve outlet gas pressure to the inlet gas pressure.
2. The closed-loop control method for the EGR valve based on the EGR rate as recited in claim 1, wherein the target EGR rate is obtained by determining the EGR rate on an engine mount according to engine speed and load, and correcting according to actual engine operating conditions.
3. The closed-loop control method for the EGR valve based on the EGR rate as recited in claim 1, wherein the actual EGR rate is obtained by calculation of exhaust gas flow rate of the EGR valve or by using a look-up table.
4. The EGR rate-based closed-loop control method of claim 1, wherein the target opening degree minimum value is 0.
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CN114233486A (en) * 2021-11-12 2022-03-25 潍柴动力股份有限公司 Control method and device of EGR valve and ECU
CN114962023A (en) * 2022-06-29 2022-08-30 东风汽车集团股份有限公司 EGR valve control method of low-pressure EGR system
CN117418947A (en) * 2023-12-18 2024-01-19 潍柴动力股份有限公司 Control method and device of EGR (exhaust gas Recirculation) system, electronic equipment and storage medium
CN117432539A (en) * 2023-12-18 2024-01-23 潍柴动力股份有限公司 Opening control method and device of EGR (exhaust gas Recirculation) system, electronic equipment and storage medium

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CN114233486A (en) * 2021-11-12 2022-03-25 潍柴动力股份有限公司 Control method and device of EGR valve and ECU
CN114233486B (en) * 2021-11-12 2023-08-18 潍柴动力股份有限公司 Control method and device for EGR valve and ECU
CN114962023A (en) * 2022-06-29 2022-08-30 东风汽车集团股份有限公司 EGR valve control method of low-pressure EGR system
CN117418947A (en) * 2023-12-18 2024-01-19 潍柴动力股份有限公司 Control method and device of EGR (exhaust gas Recirculation) system, electronic equipment and storage medium
CN117432539A (en) * 2023-12-18 2024-01-23 潍柴动力股份有限公司 Opening control method and device of EGR (exhaust gas Recirculation) system, electronic equipment and storage medium
CN117432539B (en) * 2023-12-18 2024-03-19 潍柴动力股份有限公司 Opening control method and device of EGR (exhaust gas Recirculation) system, electronic equipment and storage medium
CN117418947B (en) * 2023-12-18 2024-04-16 潍柴动力股份有限公司 Control method and device of EGR (exhaust gas Recirculation) system, electronic equipment and storage medium

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