CN115614170A - Method, device and equipment for correcting and optimizing EGR valve target opening degree and storage medium - Google Patents

Method, device and equipment for correcting and optimizing EGR valve target opening degree and storage medium Download PDF

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Publication number
CN115614170A
CN115614170A CN202211188831.7A CN202211188831A CN115614170A CN 115614170 A CN115614170 A CN 115614170A CN 202211188831 A CN202211188831 A CN 202211188831A CN 115614170 A CN115614170 A CN 115614170A
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egr valve
egr
opening degree
target
determining
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雷雪
杨柳春
张春娇
雷言言
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Dongfeng Motor Group Co Ltd
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Dongfeng Motor Group Co Ltd
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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]
    • F02D41/005—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
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • F02D2021/083—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine controlling exhaust gas recirculation electronically
    • 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
    • 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)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

The invention discloses a method, a device, equipment and a storage medium for correcting and optimizing an EGR valve target opening degree, wherein the method comprises the following steps: determining an updating coefficient according to the engine speed, the pressure ratio of two sides of the EGR valve, the EGR rate deviation, the actual EGR rate and the air-fuel ratio of the current sampling period; and determining the corrected target opening degree of the EGR valve according to the updating coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the response time of a target EGR valve actuator, the corrected target EGR valve opening degree and the initial target EGR valve opening degree of the current sampling period. Has the beneficial effects that: aiming at the characteristic of low-pressure EGR system lag, the target opening degree of the EGR valve is corrected, and the response rate of closed-loop control is improved, so that the stability of closed-loop control is improved.

Description

Method, device and equipment for correcting and optimizing EGR valve target opening degree and storage medium
Technical Field
The invention relates to the technical field of engines, in particular to a method, a device, equipment and a storage medium for correcting and optimizing an EGR valve target opening degree.
Background
Exhaust Gas Recirculation (EGR), which takes 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. The experimental research shows that the EGR valve opening degree is corrected on the basis of the air quantity, so that the closed-loop control precision of the EGR valve can be improved.
Particularly, during the operation of the engine, the opening degree needs to be corrected in real time and updated in real time so as to reflect the real opening degree of the EGR valve, thereby improving the vehicle performance.
Disclosure of Invention
In view of the above drawbacks and needs of the prior art, an object of the present invention is to provide a method, an apparatus, a device and a storage medium for correcting and optimizing a target opening degree of an EGR valve.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, a method for correcting and optimizing a target opening degree of an EGR valve includes:
determining an updating coefficient according to the engine rotating speed, the pressure ratio of two sides of the EGR valve, the EGR rate deviation, the actual EGR rate and the air-fuel ratio of the current sampling period;
and determining the corrected target opening degree of the EGR valve according to the updating coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the response time of a target EGR valve actuator, the corrected target EGR valve opening degree and the initial target EGR valve opening degree of the current sampling period.
In one embodiment, the step of determining the update coefficient based on the engine speed, the EGR valve side pressure ratio, the EGR rate deviation, the actual EGR rate, and the air-fuel ratio for the current sampling period includes:
determining a first characteristic value according to the engine speed and the pressure ratio of two sides of the EGR valve;
determining a second characteristic value according to the EGR rate deviation and the actual EGR rate;
determining a third characteristic value according to the engine speed and the actual EGR rate;
and determining the updating coefficient according to the first characteristic value, the second characteristic value, the third characteristic value and the air-fuel ratio.
In one embodiment, the step of determining the update coefficient based on the engine speed, the EGR valve side pressure ratio, the EGR rate deviation, the actual EGR rate, and the air-fuel ratio for the current sampling period further comprises:
presetting a first lookup table of the engine rotating speed, the pressure ratio of two sides of the EGR valve and a first characteristic value;
presetting a second lookup table of the EGR rate deviation-actual EGR rate-second characteristic value;
and presetting a third lookup table of the engine speed, the actual EGR rate and a third characteristic value.
In one embodiment, the update factor is determined according to the following formula:
Figure BDA0003867239930000021
wherein X represents an update coefficient, X 1 Representing a first characteristic value, x 2 Representing a second characteristic value, x 3 Indicates the third characteristic value, and λ indicates the air-fuel ratio.
In one embodiment, the step of determining a corrected target opening of the EGR valve based on the update coefficient, a reaction time of the EGR gas from the EGR valve into the cylinder, a target EGR valve actuator response time, a corrected target EGR valve opening of the current sampling period, and an initial target EGR valve opening includes:
the corrected target opening degree of the EGR valve is determined according to the following equation:
Figure BDA0003867239930000022
wherein N is a natural number, pct EGRValveDsrdNew (N) target EGR valve opening corrected for Nth sampling period, pct EGRValveDsrdRaw (N) initial target EGR valve opening for Nth sampling period, Δ T being sampling period, T AT For the reaction time, T, of EGR exhaust gases from the EGR valve into the cylinder ValveAct The EGR valve delay time.
In one embodiment, the reaction time for the EGR exhaust gas to enter the cylinder from the EGR valve and the target EGR valve actuator responsiveness time are both determined based on engine speed and actual fresh air density entering the cylinder.
In one embodiment, the method further comprises the steps of:
and performing closed-loop control on the EGR valve based on the corrected target opening degree of the EGR valve.
In a second aspect, an apparatus for correcting and optimizing a target opening degree of an EGR valve includes:
the first module is used for determining an updating coefficient according to the engine rotating speed, the pressure ratio of two sides of the EGR valve, the deviation of the EGR rate, the actual EGR rate and the air-fuel ratio of the current sampling period;
and the second module is used for determining the corrected target opening degree of the EGR valve according to the update coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the response time of a target EGR valve actuator, the corrected target opening degree of the EGR valve in the current sampling period and the initial target opening degree of the EGR valve.
In a third aspect, an electronic device includes a processor and a memory, the processor and the memory being interconnected;
the memory is used for storing a computer program;
the processor is configured to perform the method as described above when the computer program is invoked.
In a fourth aspect, a computer-readable storage medium stores a computer program which is executed by a processor to implement the method as described above.
The invention has the beneficial effects that:
determining an updating coefficient according to the engine speed, the pressure ratio of two sides of the EGR valve, the EGR rate deviation, the actual EGR rate and the air-fuel ratio of the current sampling period; and determining the corrected target opening of the EGR valve according to the update coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the response time of the target EGR valve actuator, the corrected target opening of the EGR valve in the current sampling period and the initial target opening of the EGR valve, and correcting the target opening of the EGR valve aiming at the characteristic of delay of a low-pressure EGR system, so that the response rate of closed-loop control is improved, and the stability of closed-loop control is improved.
For the correction optimization device of the EGR valve target opening degree, determining an updating coefficient according to the engine rotating speed of the current sampling period, the pressure ratio of two sides of the EGR valve, the EGR rate deviation, the actual EGR rate and the air-fuel ratio; and determining the corrected target opening of the EGR valve according to the update coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the response time of the target EGR valve actuator, the corrected target opening of the EGR valve in the current sampling period and the initial target opening of the EGR valve, and correcting the target opening of the EGR valve aiming at the characteristic of delay of a low-pressure EGR system, so that the response rate of closed-loop control is improved, and the stability of closed-loop control is improved.
For the electronic equipment, determining an updating coefficient according to the engine speed of the current sampling period, the pressure ratio of two sides of the EGR valve, the deviation of the EGR rate, the actual EGR rate and the air-fuel ratio; and determining the corrected target opening of the EGR valve according to the update coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the response time of the target EGR valve actuator, the corrected target opening of the EGR valve in the current sampling period and the initial target opening of the EGR valve, and correcting the target opening of the EGR valve aiming at the characteristic of delay of a low-pressure EGR system, so that the response rate of closed-loop control is improved, and the stability of closed-loop control is improved.
For the computer readable storage medium, determining an updating coefficient according to the engine speed, the pressure ratio of two sides of the EGR valve, the EGR rate deviation, the actual EGR rate and the air-fuel ratio of the current sampling period; and determining the corrected target opening of the EGR valve according to the update coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the response time of the target EGR valve actuator, the corrected target opening of the EGR valve in the current sampling period and the initial target opening of the EGR valve, and correcting the target opening of the EGR valve aiming at the characteristic of delay of a low-pressure EGR system, so that the response rate of closed-loop control is improved, and the stability of closed-loop control is improved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a low-pressure EGR system provided in the present embodiment;
FIG. 2 is a flowchart illustrating a method for correcting and optimizing a target opening of an EGR valve according to an embodiment;
FIG. 3 is a schematic configuration diagram of the apparatus for correcting and optimizing the target opening degree of the EGR valve in the present embodiment;
FIG. 4 is a schematic structural diagram of an electronic device of this embodiment
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The invention provides a correction optimization method of an EGR valve target opening degree, which is applied to a low-pressure EGR system.
Fig. 1 is a schematic diagram of the configuration of the low-pressure EGR system provided in this embodiment, and as shown in fig. 1, the system includes an air filter, a supercharger compressor, a throttle valve, an engine, a supercharger turbine, a catalyst, a particulate trap, an EGR cooler, an EGR valve, an EGR temperature sensor, an EGR differential pressure sensor, a flow meter, and a linear oxygen sensor, and it should be noted that the linear oxygen sensor is replaced with an integrated temperature and pressure sensor.
The supercharger compressor is used for compressing fresh air for supercharging.
The supercharger turbine controls the operating efficiency of the turbine by controlling the opening of the waste gate valve of the supercharger, thereby achieving different supercharging capacities.
The low-pressure EGR system has the following added parts compared with the non-low-pressure EGR system: EGR cooler, EGR temperature sensor, EGR valve, EGR differential pressure sensor, mixing valve, flow meter and oxygen sensor.
A flow meter is mounted between the air filter and the mixing valve for sensing the flow of fresh air into the engine.
The mixing valve is used for adjusting the pressure at the outlet of the EGR valve, improving the pressure difference at two ends of the EGR valve and improving the EGR rate.
An oxygen sensor is mounted between the compressor and the throttle and adjacent to the throttle for sensing the flow of the mixture into the cylinder.
The EGR cooler is used to cool the exhaust gas, facilitating the raising of the exhaust gas and the lowering of the exhaust gas temperature.
The EGR valve plays a throttling role and controls the waste gas entering the cylinder.
An EGR temperature sensor is used to detect the temperature of exhaust gas entering the EGR valve.
The EGR differential pressure sensor is used to detect a difference in exhaust gas pressure between both sides of EGR.
When the engine enters an EGR rate closed-loop control activation state, the EGR rate control adopts PID control. Fig. 2 is a flowchart illustrating a closed-loop control method of the EGR rate according to the present embodiment.
The method corrects the opening degree in the running process of the engine so as to update and reflect the real opening degree of the EGR valve in real time, and meanwhile self-learning updates are carried out on the target opening degree of the EGR valve under the steady-state working condition. Therefore, the control of the EGR valve can be more accurately carried out, the requirement of the EGR rate in the EGR system is met, and the vehicle performance is improved by utilizing the advantage of the EGR rate. As shown in fig. 2, the method includes:
s100, determining an updating coefficient according to the engine speed of the current sampling period, the pressure ratio of two sides of the EGR valve, the deviation of the EGR rate, the actual EGR rate and the air-fuel ratio.
Specifically, step S100 includes: determining a first characteristic value according to the engine speed and the pressure ratio of two sides of the EGR valve; determining a second characteristic value according to the EGR rate deviation and the actual EGR rate; determining a third characteristic value according to the engine speed and the actual EGR rate; and determining an updating coefficient according to the first characteristic value, the second characteristic value, the third characteristic value and the air-fuel ratio.
It should be noted that a first lookup table of engine speed-pressure ratio across EGR valve-first characteristic value is preset.
Figure BDA0003867239930000071
TABLE 1
A second lookup table of preset EGR rate deviation-actual EGR rate-second characteristic value.
Figure BDA0003867239930000081
TABLE 2
And presetting a third lookup table of the engine speed, the actual EGR rate and a third characteristic value.
Figure BDA0003867239930000082
TABLE 3
It can be understood that the larger the engine speed is, and the smaller the pressure ratio of two sides of the EGR valve is, the better the throttling effect of the EGR valve is, the higher the stability of the engine is, and at the moment, the better the EGR control working condition is, and the control accuracy can be further improved, so that the opening control can be optimized. The opening degree control can be optimized to further improve the control accuracy as the EGR rate is larger and the absolute value of the EGR rate deviation is larger. If overshoot occurs in order to avoid excessive acceleration of control when the EGR rate is small or the absolute value of the EGR rate deviation is small, adjustment and optimization of the limit opening degree are required.
The update coefficient is determined according to the following formula:
Figure BDA0003867239930000083
wherein X represents an update coefficient, X 1 Representing a first characteristic value, x 2 Represents a second characteristic value, x 3 Indicates the third characteristic value, and λ indicates the air-fuel ratio.
And S100, performing S200, and determining a corrected target opening of the EGR valve according to the update coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the target EGR valve actuator response time, the corrected target EGR valve opening of the current sampling period and the initial target EGR valve opening.
The corrected target opening degree of the EGR valve is determined according to the following equation:
Figure BDA0003867239930000091
wherein N is a natural number, pct EGRValveDsrdNew (N) target EGR valve opening corrected for Nth sampling period, pct EGRValveDsrdNew (N-1) target EGR valve opening corrected for the Nth-1 th sampling period, pct EGRValveDsrdRaw (N) is the initial target EGR valve opening degree at the Nth sampling period of the previously disclosed known technology, and Δ T is the sampling period, which is set to 0.01 second in this embodiment, and T is the sampling period AT For the reaction time, T, of EGR exhaust gases from the EGR valve into the cylinder ValveAct The EGR valve delay time.
Note that, the initial target EGR valve opening degree Pct for the 0 th sampling period EGRValveDsrdRaw (0) Is set to 0.
Further, the reaction time of the EGR exhaust gas from the EGR valve into the cylinder is determined by the engine speed and the density of fresh air entering the cylinder.
In the present embodiment, table 4 is preset which relates to engine speed-density of fresh air entering cylinder-reaction time of EGR exhaust gas entering cylinder from EGR valve, and reaction time T of EGR exhaust gas entering cylinder from EGR valve is determined from table 4 AT The method for determining the fuel correction stability comprises the steps of monitoring the influence process of the EGR valve on the short-term fuel correction of the engine after the EGR valve is opened, and recording the time from the short-term fuel correction to the time when the short-term fuel correction starts to be changed to the time when the short-term fuel correction starts to be stable.
Figure BDA0003867239930000101
TABLE 4
In the embodiment, the EGR valve delay time T relative to the engine speed-the density of fresh air entering the cylinder is preset ValveAct The delay time of the EGR valve is determined according to the lookup table 5 by opening the EGR valve, monitoring the influence process of the EGR valve on the short-term fuel correction of the engine, and recording the time from the opening of the EGR valve to the start of the short-term fuel correction of the engine.
Figure BDA0003867239930000102
TABLE 5
Step S300 is further included after step S200, and the EGR valve closed-loop control is performed based on the corrected EGR valve opening degree.
According to the method for correcting and optimizing the target opening degree of the EGR valve, an updating coefficient is determined according to the engine speed, the pressure ratio of two sides of the EGR valve, the EGR rate deviation, the actual EGR rate and the air-fuel ratio of the current sampling period; and determining the corrected target opening of the EGR valve according to the update coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the response time of the target EGR valve actuator, the corrected target opening of the EGR valve in the current sampling period and the initial target opening of the EGR valve, and correcting the target opening of the EGR valve aiming at the characteristic of delay of a low-pressure EGR system, so that the response rate of closed-loop control is improved, and the stability of closed-loop control is improved.
The embodiment further provides a device for correcting and optimizing the target opening degree of the EGR valve, and fig. 3 is a schematic structural diagram of the device for correcting and optimizing the target opening degree of the EGR valve.
As shown in fig. 3, the apparatus for correcting and optimizing the target opening degree of the EGR valve includes a first module and a second module.
The first module is used for determining an updating coefficient according to the engine rotating speed of the current sampling period, the pressure ratio of two sides of the EGR valve, the deviation of the EGR rate, the actual EGR rate and the air-fuel ratio;
the second module is used for determining the corrected target opening degree of the EGR valve according to the update coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the response time of a target EGR valve actuator, the corrected target opening degree of the EGR valve in the current sampling period and the initial target opening degree of the EGR valve.
In some possible embodiments, the first module is further configured to:
determining a first characteristic value according to the engine speed and the pressure ratio of two sides of the EGR valve;
determining a second characteristic value according to the EGR rate deviation and the actual EGR rate;
determining a third characteristic value according to the engine speed and the actual EGR rate;
and determining the updating coefficient according to the first characteristic value, the second characteristic value, the third characteristic value and the air-fuel ratio.
In some possible embodiments, the first module is further configured to:
presetting a first lookup table of engine speed, pressure ratio on two sides of an EGR valve and a first characteristic value;
presetting a second lookup table of the EGR rate deviation-actual EGR rate-second characteristic value;
and presetting a third lookup table of the engine speed-actual EGR rate-third characteristic value.
It should be noted that the update coefficient is determined according to the following formula:
Figure BDA0003867239930000121
wherein X represents an update coefficient, X 1 Representing a first characteristic value, x 2 Representing a second characteristic value, x 3 Indicates the third characteristic value, and λ indicates the air-fuel ratio.
In some possible implementations, the second module is further configured to determine the modified target opening of the EGR valve according to the following equation:
Figure BDA0003867239930000122
wherein N is a natural number, pct EGRValveDsrdNew (N) target EGR valve opening corrected for Nth sampling period, pct EGRValveDsrdRaw (N) initial target EGR valve opening for Nth sampling period, Δ T being sampling period, T AT For the reaction time, T, of EGR exhaust gases from the EGR valve into the cylinder ValveAct Is the target EGR valve actuator responsiveness time.
Wherein the reaction time for the EGR exhaust gas to enter the cylinder from the EGR valve and the target EGR valve actuator responsiveness time are both determined based on engine speed and actual fresh air density entering the cylinder.
The device for correcting and optimizing the target opening degree of the EGR valve further comprises a third module, and the third module is used for carrying out closed-loop control on the EGR valve based on the corrected target opening degree of the EGR valve.
It should be noted that the apparatus for correcting and optimizing the target opening degree of the EGR valve provided in the present embodiment may be a computer program (including program code) running in a computer device, for example, the apparatus for correcting and optimizing the target opening degree of the EGR valve is an application software; the device for correcting and optimizing the target opening degree of the EGR valve can be used for executing the corresponding steps in the method provided by the embodiment of the application.
In some possible embodiments, the apparatus for correcting and optimizing the target opening degree of the EGR valve provided in this embodiment may be implemented by combining hardware and software, and by way of example, the apparatus for correcting and optimizing the target opening degree of the EGR valve provided in this embodiment may be a processor in the form of a hardware decoding processor, which is programmed to perform the closed-loop control method for the EGR rate provided in this embodiment, for example, the processor in the form of the hardware decoding processor may employ one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), programmable Logic Devices (PLDs), complex Programmable Logic Devices (CPLDs), field Programmable Gate Array (FPGAs), or other electronic components.
In some possible embodiments, the device for optimizing the correction of the target opening degree of the EGR valve provided by the embodiment of the present invention may be implemented by software, which may be software in the form of programs, plug-ins, and the like, and includes a series of modules, such as a first module, a second module, and a third module, to implement the method for optimizing the correction of the target opening degree of the EGR valve provided by the embodiment of the present invention.
The correction optimization device for the target opening degree of the EGR valve determines an updating coefficient according to the engine speed, the pressure ratio of two sides of the EGR valve, the deviation of the EGR rate, the actual EGR rate and the air-fuel ratio in the current sampling period; and determining the corrected target opening of the EGR valve according to the update coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the response time of the target EGR valve actuator, the corrected target opening of the EGR valve in the current sampling period and the initial target opening of the EGR valve, and correcting the target opening of the EGR valve aiming at the characteristic of delay of a low-pressure EGR system, so that the response rate of closed-loop control is improved, and the stability of closed-loop control is improved.
An embodiment of the present application further provides an electronic device, fig. 4 is a schematic structural diagram of the electronic device of the present embodiment, and as shown in fig. 4, the electronic device 1000 in the present embodiment may include: the processor 1001, the network interface 1004, and the memory 1005, and the electronic device 1000 may further include: a user interface 1003, and at least one communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display) and a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a standard wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1004 may be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The memory 1005 may optionally be at least one memory device located remotely from the processor 1001. As shown in fig. 4, a memory 1005, which is a kind of computer-readable storage medium, may include therein an operating system, a network communication module, a user interface module, and a device control application program.
In the electronic sub-device 1000 shown in fig. 4, the network interface 1004 may provide network communication functions; the user interface 1003 is an interface for providing a user with input; and the processor 1001 may be used to invoke a device control application stored in the memory 1005 to implement:
determining an updating coefficient according to the engine rotating speed, the pressure ratio of two sides of the EGR valve, the EGR rate deviation, the actual EGR rate and the air-fuel ratio of the current sampling period;
and determining the corrected target opening degree of the EGR valve according to the update coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the response time of a target EGR valve actuator, the corrected target opening degree of the EGR valve in the current sampling period and the initial target opening degree of the EGR valve.
It should be understood that, in some possible embodiments, the processor 1001 may be a Central Processing Unit (CPU), and the processor may be other general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The memory may include both read-only memory and random access memory and provides instructions and data to the processor. The portion of memory may also include non-volatile random access memory. For example, the memory may also store device type information.
In a specific implementation, the electronic device 1000 may execute the implementation manners provided in the steps in fig. 2 through the built-in functional modules, which may specifically refer to the implementation manners provided in the steps, and are not described herein again.
An embodiment of the present application further provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and is executed by a processor to implement the method provided in each step in fig. 2, which may specifically refer to the implementation manner provided in each step, and is not described herein again.
The computer readable storage medium may be an internal storage unit, such as a hard disk or a memory of an electronic device, of the method for correcting and optimizing the target opening degree of the EGR valve provided in any of the foregoing embodiments. The computer readable storage medium may also be an external storage device of the electronic device, such as a plug-in hard disk, a Smart Memory Card (SMC), a Secure Digital (SD) card, a flash card (flash card), and the like, which are provided on the electronic device. The computer readable storage medium may further include a magnetic disk, an optical disk, a read-only memory (ROM), a Random Access Memory (RAM), and the like. Further, the computer readable storage medium may also include both an internal storage unit and an external storage device of the electronic device. The computer-readable storage medium is used for storing the computer program and other programs and data required by the electronic device. The computer readable storage medium may also be used to temporarily store data that has been output or is to be output.
Embodiments of the present application provide a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The computer instructions are read by a processor of the electronic device from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method provided by the steps in fig. 2.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of execution is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The foregoing is only a few embodiments of the present application and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present application, and that these improvements and modifications should also be considered as the protection scope of the present application.

Claims (10)

1. A method for correcting and optimizing a target opening degree of an EGR valve, comprising the steps of:
determining an updating coefficient according to the engine rotating speed, the pressure ratio of two sides of the EGR valve, the EGR rate deviation, the actual EGR rate and the air-fuel ratio of the current sampling period;
and determining the corrected target opening degree of the EGR valve according to the updating coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the response time of a target EGR valve actuator, the corrected target EGR valve opening degree and the initial target EGR valve opening degree of the current sampling period.
2. The method for correcting and optimizing the target opening degree of the EGR valve according to claim 1, wherein the step of determining the update coefficient based on the engine speed, the EGR valve side pressure ratio, the EGR rate deviation, the actual EGR rate, and the air-fuel ratio of the current sampling period comprises:
determining a first characteristic value according to the engine speed and the pressure ratio of two sides of the EGR valve;
determining a second characteristic value according to the EGR rate deviation and the actual EGR rate;
determining a third characteristic value according to the engine speed and the actual EGR rate;
and determining the updating coefficient according to the first characteristic value, the second characteristic value, the third characteristic value and the air-fuel ratio.
3. The method for correcting and optimizing the target opening degree of the EGR valve according to claim 2, wherein the step of determining the update coefficient based on the engine speed, the EGR valve side pressure ratio, the EGR rate deviation, the actual EGR rate, and the air-fuel ratio for the current sampling period further comprises:
presetting a first lookup table of the engine rotating speed, the pressure ratio of two sides of the EGR valve and a first characteristic value;
presetting a second lookup table of the EGR rate deviation-actual EGR rate-second characteristic value;
and presetting a third lookup table of the engine speed-actual EGR rate-third characteristic value.
4. The modified optimization method of the EGR valve target opening degree according to claim 2, characterized in that the update coefficient is determined according to the following formula:
Figure FDA0003867239920000021
wherein X represents an update coefficient, X 1 Representing a first characteristic value, x 2 Represents a second characteristic value, x 3 Indicates the third characteristic value, and λ indicates the air-fuel ratio.
5. The method of claim 1, wherein the step of determining the corrected target opening of the EGR valve based on the update factor, the reaction time of the EGR gas from the EGR valve to the cylinder, the target EGR valve actuator response time, the corrected target EGR valve opening of the current sampling period, and the initial target EGR valve opening comprises:
the corrected target opening degree of the EGR valve is determined according to the following equation:
Pct EGRValveDsrdNew (N)＝X×{Pct EGRValveDsrdNew (N-1)+[Pct EGRValveDsrdRaw (N)-
Figure FDA0003867239920000022
wherein N is a natural number, pct EGRValveDsrdNew (N) target EGR valve opening corrected for Nth sampling period, pct EGRValveDsrdRaw (N) initial target EGR valve opening for Nth sampling period, Δ T being sampling period, T AT For the reaction time, T, of EGR exhaust gases from the EGR valve into the cylinder ValveAct The EGR valve delay time.
6. The modified optimization method of the target opening degree of the EGR valve in accordance with claim 5, wherein the reaction time of the EGR exhaust gas from the EGR valve into the cylinder and the target EGR valve actuator responsiveness time are each determined in accordance with the engine speed and the actual fresh air density entering the cylinder.
7. The corrected optimization method of the EGR valve target opening degree according to claim 1, characterized by further comprising the steps of:
and performing closed-loop control on the EGR valve based on the corrected target opening degree of the EGR valve.
8. An apparatus for correcting and optimizing a target opening degree of an EGR valve, comprising:
the first module is used for determining an updating coefficient according to the engine rotating speed, the pressure ratio of two sides of the EGR valve, the deviation of the EGR rate, the actual EGR rate and the air-fuel ratio of the current sampling period;
and the second module is used for determining the corrected target opening degree of the EGR valve according to the updating coefficient, the reaction time of the EGR waste gas entering the cylinder from the EGR valve, the response time of a target EGR valve actuator, the corrected target EGR valve opening degree of the current sampling period and the initial target EGR valve opening degree.
9. An electronic device comprising a processor and a memory, the processor and the memory being interconnected;
the memory is used for storing a computer program;
the processor is configured to perform the method of any of claims 1 to 7 when the computer program is invoked.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which is executed by a processor to implement the method of any one of claims 1 to 7.
CN202211188831.7A 2022-09-27 2022-09-27 Method, device and equipment for correcting and optimizing EGR valve target opening degree and storage medium Pending CN115614170A (en)

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