[go: up one dir, main page]

CN115614170B - Correction optimization method, device and equipment for target opening degree of EGR valve and storage medium - Google Patents

Correction optimization method, device and equipment for target opening degree of EGR valve and storage medium Download PDF

Info

Publication number
CN115614170B
CN115614170B CN202211188831.7A CN202211188831A CN115614170B CN 115614170 B CN115614170 B CN 115614170B CN 202211188831 A CN202211188831 A CN 202211188831A CN 115614170 B CN115614170 B CN 115614170B
Authority
CN
China
Prior art keywords
egr valve
egr
characteristic value
determining
target opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202211188831.7A
Other languages
Chinese (zh)
Other versions
CN115614170A (en
Inventor
雷雪
杨柳春
张春娇
雷言言
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongfeng Motor Group Co Ltd
Original Assignee
Dongfeng Motor Group Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dongfeng Motor Group Co Ltd filed Critical Dongfeng Motor Group Co Ltd
Priority to CN202211188831.7A priority Critical patent/CN115614170B/en
Publication of CN115614170A publication Critical patent/CN115614170A/en
Application granted granted Critical
Publication of CN115614170B publication Critical patent/CN115614170B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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

Landscapes

  • 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 correction optimization method, a device, equipment and a storage medium for target opening of an EGR valve, wherein the method comprises the following steps: determining an update 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 in the current sampling period; and determining a corrected target EGR valve opening according to the updating coefficient, the reaction time of the EGR exhaust 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 beneficial effects are that: the target opening of the EGR valve is corrected according to the characteristic of hysteresis of the low-pressure EGR system, so that the response rate of closed-loop control is improved, and the stability of closed-loop control is improved.

Description

Correction optimization method, device and equipment for target opening degree of EGR valve and storage medium
Technical Field
The invention relates to the technical field of engines, in particular to a correction optimization method, device and equipment for target opening of an EGR valve and a storage medium.
Background
Exhaust Gas Recirculation (EGR) 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. Experimental research shows that the closed-loop control precision of the EGR valve can be improved by correcting the opening of the EGR valve based on the air quantity.
Especially, in the running process of the engine, the opening degree needs to be corrected in real time, and the real opening degree of the EGR valve is 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 or improvements of the prior art, an object of the present invention is to provide a method, apparatus, device and storage medium for optimizing correction of a target opening of an EGR valve.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, a method for optimizing correction of a target opening of an EGR valve includes the steps of:
determining an update 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 in the current sampling period;
and determining a corrected target EGR valve opening according to the updating coefficient, the reaction time of the EGR exhaust 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.
In one embodiment, the step of determining the update coefficient according to 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 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 update 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 according to 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 further includes:
A first lookup table for presetting the engine speed, the pressure ratio at two sides of the EGR valve and a first characteristic value;
a second lookup table for presetting 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.
In one embodiment, the update coefficients are determined according to the following formula:
where X denotes an update coefficient, X 1 denotes a first characteristic value, X 2 denotes a second characteristic value, X 3 denotes a third characteristic value, and λ denotes an air-fuel ratio.
In one embodiment, the step of determining the corrected EGR valve target opening based on the update coefficient, the reaction time of EGR exhaust gas from the EGR valve into the cylinder, the target EGR valve actuator response time, the corrected target EGR valve opening for the current sampling period, and the initial target EGR valve opening includes:
The corrected EGR valve target opening degree is determined according to the following equation:
Wherein N is a natural number, pct EGRValveDsrdNew (N) is an EGR valve target opening corrected in an nth sampling period, pct EGRValveDsrdRaw (N) is an initial target EGR valve opening in an nth sampling period of the prior art, Δt is a sampling period, T AT is a reaction time of EGR exhaust gas from the EGR valve into the cylinder, and T ValveAct is an EGR valve delay time.
In one embodiment, the reaction time of the EGR exhaust gas from the EGR valve into the cylinder and the target EGR valve actuator response time are both determined based on engine speed and actual fresh air density into the cylinder.
In one embodiment, the method further comprises the steps of:
and performing EGR valve closed-loop control based on the corrected EGR valve target opening.
In a second aspect, an apparatus for optimizing correction of a target opening degree of an EGR valve includes:
the first module is used for determining an update 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 the second module is used for determining the corrected target opening of the EGR valve according to the updating coefficient, the reaction time of the EGR exhaust gas entering the cylinder from the EGR valve, the target EGR valve actuator response time, the corrected target opening of the EGR valve in the current sampling period and the initial target opening of the EGR valve.
In a third aspect, an electronic device comprises 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 for execution by a processor to implement a method as described above.
The invention has the beneficial effects that:
For the correction optimization method of the target opening of the EGR valve, determining an update 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 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 exhaust 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, correcting the target opening of the EGR valve according to the hysteresis characteristic of the low-pressure EGR system, and improving the response rate of closed-loop control, thereby improving the stability of closed-loop control.
For the correction optimizing device of the target opening of the EGR valve, determining an update 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 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 exhaust 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, correcting the target opening of the EGR valve according to the hysteresis characteristic of the low-pressure EGR system, and improving the response rate of closed-loop control, thereby improving the stability of closed-loop control.
For the electronic equipment, determining an update 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 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 exhaust 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, correcting the target opening of the EGR valve according to the hysteresis characteristic of the low-pressure EGR system, and improving the response rate of closed-loop control, thereby improving the stability of closed-loop control.
For a computer readable storage medium, determining an update coefficient based on an engine speed, an EGR valve side pressure ratio, an EGR rate deviation, an actual EGR rate, and an air-fuel ratio for a current sampling period; and determining the corrected target opening of the EGR valve according to the update coefficient, the reaction time of the EGR exhaust 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, correcting the target opening of the EGR valve according to the hysteresis characteristic of the low-pressure EGR system, and improving the response rate of closed-loop control, thereby improving the stability of closed-loop control.
Additional aspects and advantages of the 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 application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a schematic configuration diagram of a low-pressure EGR system provided in the present embodiment;
Fig. 2 is a flowchart of a correction optimization method of the target opening degree of the EGR valve provided in the present embodiment;
Fig. 3 is a schematic structural view of a correction optimizing apparatus of the target opening degree of the EGR valve in the present embodiment;
fig. 4 is a schematic structural view of the electronic device of the present embodiment
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. 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 skilled in the art that 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 unless defined otherwise. 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 a low pressure EGR system provided in this embodiment, and as shown in fig. 1, the system includes an air filter, a booster compressor, a throttle valve, an engine, a booster turbine, a catalyst, a particulate matter 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 is noted that the linear oxygen sensor is replaced with an integrated temperature and pressure sensor.
The booster compressor is used for compressing fresh air for boosting.
The turbocharger turbine controls the working efficiency of the turbine by controlling the opening of the wastegate valve of the turbocharger, thereby realizing different supercharging capacities.
The low pressure EGR system has increased parts relative to non-low pressure EGR systems: an EGR cooler, an EGR temperature sensor, an EGR valve, an EGR differential pressure sensor, a mixing valve, a flow meter, and an oxygen sensor.
A flow meter is mounted between the air filter and the mixing valve for detecting the flow of fresh air into the engine.
The mixing valve is used for adjusting the pressure of an outlet of the EGR valve, improving the pressure difference of two ends of the EGR valve and improving the EGR rate.
An oxygen sensor is mounted between the compressor and the throttle valve and is adjacent to the throttle valve, the oxygen sensor being for detecting the flow of the mixture into the cylinder.
EGR coolers are used to cool the exhaust gases in order to increase the exhaust gases and to reduce the exhaust gas temperature.
The EGR valve acts as a throttle to control the exhaust gas entering the cylinder.
The EGR temperature sensor is used to detect the temperature of exhaust gas entering the EGR valve.
The EGR pressure difference 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 of a closed-loop control method of the EGR rate provided in the present embodiment.
The method corrects the opening degree in the running process of the engine so as to achieve the effect of updating and reflecting the real opening degree of the EGR valve in real time, and simultaneously carries out self-learning updating on the target opening degree of the EGR valve under the steady-state working condition. Therefore, the control of the EGR valve is performed more accurately, 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 update 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.
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 update coefficient according to the first characteristic value, the second characteristic value, the third characteristic value and the air-fuel ratio.
The first lookup table of the preset engine speed-the EGR valve side pressure ratio-the first characteristic value.
TABLE 1
A second lookup table for presetting an EGR rate deviation-an actual EGR rate-a second characteristic value.
TABLE 2
And presetting a third lookup table of the engine speed-actual EGR rate-third characteristic value.
TABLE 3 Table 3
It can be understood that when the engine speed is higher and the pressure ratio of two sides of the EGR valve is smaller, the throttling effect of the EGR valve is better, the engine stability is higher, and the EGR control working condition is better at the moment, so that the opening control of the EGR valve can be optimized for further improving the control precision. The opening degree control may be optimized to further improve the control accuracy as the EGR rate increases and the EGR rate deviation absolute value increases. If overshoot occurs when the EGR rate is small or the absolute value of the EGR rate deviation is small, it is necessary to limit the adjustment optimization of the opening degree in order to avoid excessive control.
The update coefficients are determined according to the following formula:
where X denotes an update coefficient, X 1 denotes a first characteristic value, X 2 denotes a second characteristic value, X 3 denotes a third characteristic value, and λ denotes an air-fuel ratio.
Step S100 is followed by step S200, and the corrected target EGR valve opening and the initial target EGR valve opening of the current sampling period are determined according to the update coefficient, the reaction time of the EGR exhaust gas entering the cylinder from the EGR valve, the target EGR valve actuator response time and the corrected target EGR valve opening and the initial target EGR valve opening.
The corrected EGR valve target opening degree is determined according to the following equation:
Wherein N is a natural number, pct EGRValveDsrdNew (N) is an EGR valve target opening corrected in an nth sampling period, pct EGRValveDsrdNew (N-1) is an EGR valve target opening corrected in an nth-1 sampling period, pct EGRValveDsrdRaw (N) is an initial target EGR valve opening in an nth sampling period of the prior art, Δt is a sampling period, in this embodiment, the period is set to 0.01 seconds, T AT is a reaction time of EGR exhaust gas from the EGR valve into the cylinder, and T ValveAct is an EGR valve delay time.
The initial target EGR valve opening degree Pct EGRValveDsrdRaw (0) of the 0 th sampling period 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 fresh air density into the cylinder.
In this embodiment, table 4 about engine speed-fresh air density of intake cylinder-reaction time of EGR exhaust gas from EGR valve into cylinder is preset, reaction time T AT of EGR exhaust gas from EGR valve into cylinder is determined according to table 4, and the determination method is that the process of monitoring the influence on short-term fuel correction of engine after opening the opening of EGR valve is performed, and the time from short-term fuel correction start to short-term fuel correction start stabilization moment is recorded.
TABLE 4 Table 4
In this embodiment, table 5 about engine speed-fresh air density entering the cylinder-EGR valve delay time T ValveAct is preset, and the EGR valve delay time is determined according to table 5, by monitoring the process of influence on short-term fuel correction of the engine after opening the EGR valve, and recording the time from when the EGR valve is opened to when the short-term fuel correction of the engine starts to change.
TABLE 5
Step S200 is followed by step S300 of performing EGR valve closed-loop control based on the corrected EGR valve opening degree.
According to the correction optimization method for the target opening of the EGR valve, an update 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 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 exhaust 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, correcting the target opening of the EGR valve according to the hysteresis characteristic of the low-pressure EGR system, and improving the response rate of closed-loop control, thereby improving the stability of closed-loop control.
The present embodiment also provides a correction optimizing device for the target opening of the EGR valve, and fig. 3 is a schematic structural diagram of the correction optimizing device for the target opening of the EGR valve.
As shown in fig. 3, the correction optimizing apparatus of the EGR valve target opening degree includes a first module and a second module.
The first module is used for determining an update 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 in the current sampling period;
the second module is used for determining a corrected target opening of the EGR valve according to the update coefficient, the reaction time of the EGR exhaust 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.
In some possible embodiments, the first module is further 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 update 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 to:
A first lookup table for presetting the engine speed, the pressure ratio at two sides of the EGR valve and a first characteristic value;
a second lookup table for presetting 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:
where X denotes an update coefficient, X 1 denotes a first characteristic value, X 2 denotes a second characteristic value, X 3 denotes a third characteristic value, and λ denotes an air-fuel ratio.
In some possible embodiments, the second module is further configured to determine the corrected EGR valve target opening according to the following equation:
Where N is a natural number, pct EGRValveDsrdNew (N) is an EGR valve target opening corrected in an nth sampling period, pct EGRValveDsrdRaw (N) is an initial target EGR valve opening in an nth sampling period of the previously disclosed known technology, Δt is a sampling period, T AT is a reaction time of EGR exhaust gas from the EGR valve into the cylinder, and T ValveAct is a target EGR valve actuator response time.
Wherein the reaction time of the EGR exhaust gas from the EGR valve into the cylinder and the target EGR valve actuator response time are both determined based on the engine speed and the actual fresh air density into the cylinder.
The correction optimizing device of the target opening degree of the EGR valve further comprises a third module, wherein the third module is used for performing closed-loop control of the EGR valve based on the corrected target opening degree of the EGR valve.
It should be noted that, the correction optimizing device for the target opening of the EGR valve provided in this embodiment may be a computer program (including program code) running in a computer device, for example, the correction optimizing device for the target opening of the EGR valve is an application software; the correction optimizing device of the target opening degree of the EGR valve can be used for executing corresponding steps in the method provided by the embodiment of the application.
In some possible implementations, the correction optimizing apparatus for the target opening degree of the EGR valve provided in this embodiment may be implemented by combining software and hardware, and as an example, the correction optimizing apparatus for 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 of the present application, for example, the processor in the form of a hardware decoding processor may use one or more application specific integrated circuits (ASIC, applicationSpecific INTEGRATED CIRCUIT), digital signal processors (DIGITAL SIGNAL processor, DSP), programmable Logic devices (PLD, programmable Logic Device), complex programmable Logic devices (CPLD, complexProgrammable Logic devices), field-programmable gate arrays (FPGA, field-Programmable GateArray), or other electronic components.
In some possible embodiments, the correction optimizing device for the target opening degree of the EGR valve provided in this embodiment may be implemented in a software manner, which may be software in the form of a program, an insert, or the like, and includes a series of modules, for example, a first module, a second module, and a third module, so as to implement the correction optimizing method for the target opening degree of the EGR valve provided in the embodiment of the present invention.
The correction optimizing device for the target opening of the EGR valve determines an update 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 exhaust 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, correcting the target opening of the EGR valve according to the hysteresis characteristic of the low-pressure EGR system, and improving the response rate of closed-loop control, thereby improving the stability of closed-loop control.
An embodiment of the present application further provides an electronic device, and fig. 4 is a schematic structural diagram of the electronic device of the present embodiment, as shown in fig. 4, an electronic device 1000 in the present embodiment may include: processor 1001, network interface 1004, and memory 1005, and in addition, the electronic device 1000 may further include: a user interface 1003, and at least one communication bus 1002. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display (Display), a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface, among others. 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 (non-volatile memory), such as at least one disk memory. The memory 1005 may also optionally be at least one storage device located remotely from the processor 1001. As shown in fig. 4, an operating system, a network communication module, a user interface module, and a device control application may be included in the memory 1005, which is a type of computer-readable storage medium.
In the electronic sub-device 1000 shown in fig. 4, the network interface 1004 may provide a network communication function; while user interface 1003 is primarily used as an interface for providing input to a user; and the processor 1001 may be used to invoke a device control application stored in the memory 1005 to implement:
determining an update 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 in the current sampling period;
and determining a corrected target EGR valve opening according to the updating coefficient, the reaction time of the EGR exhaust 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.
It should be appreciated that in some possible embodiments, the processor 1001 described above may be a central processing unit (central processing unit, CPU), which may also be other general purpose processors, DSP, ASIC, FPGA or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, 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 read only memory and random access memory and provide instructions and data to the processor. A portion of the memory may also include non-volatile random access memory. For example, the memory may also store information of the device type.
In a specific implementation, the electronic device 1000 may execute, through each functional module built in the electronic device, an implementation manner provided by each step in fig. 2, and specifically, the implementation manner provided by each step may be referred to, which is not described herein again.
The embodiment of the present application further provides a computer readable storage medium, where a computer program is stored and executed by a processor to implement the method provided by each step in fig. 2, and specifically, the implementation manner provided by each step may be referred to, which is not described herein.
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 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 (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD), or the like, which are provided on the electronic device. The computer readable storage medium may also include a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (randomaccess memory, RAM), or 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 to store 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 from the computer-readable storage medium by a processor of the electronic device, and executed by the processor, cause the computer device to perform the method provided by the steps of 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, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
The foregoing is only a partial embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present application, and such modifications and adaptations are intended to be comprehended within the scope of the present application.

Claims (9)

1. The correction optimization method of the target opening of the EGR valve is characterized by comprising the following steps of:
determining an update 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 in the current sampling period;
Determining a corrected target opening of the EGR valve according to the update coefficient, the reaction time of the EGR exhaust gas entering the cylinder from the EGR valve, the target EGR valve actuator response time, the corrected target opening of the EGR valve in the current sampling period and the initial target opening of the EGR valve;
the step of determining the update coefficient according to 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 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 update coefficient according to the first characteristic value, the second characteristic value, the third characteristic value and the air-fuel ratio.
2. The correction optimization method of 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 both-side pressure ratio, the EGR rate deviation, the actual EGR rate, and the air-fuel ratio of the current sampling period further includes:
A first lookup table for presetting the engine speed, the pressure ratio at two sides of the EGR valve and a first characteristic value;
a second lookup table for presetting 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.
3. The correction optimization method of the EGR valve target opening degree according to claim 1, characterized in that the update coefficient is determined according to the following formula:
；
where X denotes an update coefficient, X 1 denotes a first characteristic value, X 2 denotes a second characteristic value, X 3 denotes a third characteristic value, and λ denotes an air-fuel ratio.
4. The method of optimizing correction of an EGR valve target opening degree according to claim 1, wherein the step of determining the corrected EGR valve target opening degree based on the update coefficient, a reaction time of EGR exhaust gas from the EGR valve into the cylinder, a target EGR valve actuator response time, the corrected target EGR valve opening degree of the current sampling period, and an initial target EGR valve opening degree includes:
The corrected EGR valve target opening degree is determined according to the following equation:
PctEGRValveDsrdNew(N)=X×{PctEGRValveDsrdNew(N-1)+[PctEGRValveDsrdRaw(N)-PctEGRValveDsrdNew(N-1)]×}+(1-x)×PctEGRValveDsrdRaw(N)；
Wherein X represents an update coefficient, N is a natural number, pct EGRValveDsrdNew (N) is an EGR valve target opening corrected in an N-th sampling period, pct EGRValveDsrdRaw (N) is an initial target EGR valve opening in an N-th sampling period, Δt is a sampling period, T AT is a reaction time of EGR exhaust gas entering a cylinder from an EGR valve, and T ValveAct is an EGR valve delay time.
5. The method of optimizing correction of an EGR valve target opening degree according to claim 4, characterized in that a reaction time of the EGR exhaust gas from the EGR valve into the cylinder and the target EGR valve actuator response time are both determined based on an engine speed and an actual fresh air density into the cylinder.
6. The correction optimization method of the target opening degree of the EGR valve according to claim 1, characterized by further comprising the steps of:
and performing EGR valve closed-loop control based on the corrected EGR valve target opening.
7. An apparatus for optimizing correction of a target opening degree of an EGR valve, comprising:
the first module is used for determining an update 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;
the second module is used for determining a corrected target opening of the EGR valve according to the update coefficient, the reaction time of the EGR exhaust 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;
the step of determining the update coefficient according to 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 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 update coefficient according to the first characteristic value, the second characteristic value, the third characteristic value and the air-fuel ratio.
8. 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 6 when the computer program is invoked.
9. 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 6.
CN202211188831.7A 2022-09-27 2022-09-27 Correction optimization method, device and equipment for target opening degree of EGR valve and storage medium Active CN115614170B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211188831.7A CN115614170B (en) 2022-09-27 2022-09-27 Correction optimization method, device and equipment for target opening degree of EGR valve and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211188831.7A CN115614170B (en) 2022-09-27 2022-09-27 Correction optimization method, device and equipment for target opening degree of EGR valve and storage medium

Publications (2)

Publication Number Publication Date
CN115614170A CN115614170A (en) 2023-01-17
CN115614170B true CN115614170B (en) 2024-08-20

Family

ID=84859907

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211188831.7A Active CN115614170B (en) 2022-09-27 2022-09-27 Correction optimization method, device and equipment for target opening degree of EGR valve and storage medium

Country Status (1)

Country Link
CN (1) CN115614170B (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110714862A (en) * 2019-10-21 2020-01-21 上海理工大学 Control method for realizing pre-control exhaust gas recirculation system
CN111622853A (en) * 2020-05-29 2020-09-04 一汽解放汽车有限公司 Self-adaptive EGR control method based on engine nitrogen and oxygen emission

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57165656A (en) * 1981-04-07 1982-10-12 Nissan Motor Co Ltd Egr device of diesel engine
DE19736522A1 (en) * 1997-08-22 1999-02-25 Deutz Ag Control system for IC engine
KR102518657B1 (en) * 2018-07-12 2023-04-06 현대자동차주식회사 Method for Exhaust Gas Recirculation Control using Differentiated Valve Duty and EGR System thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110714862A (en) * 2019-10-21 2020-01-21 上海理工大学 Control method for realizing pre-control exhaust gas recirculation system
CN111622853A (en) * 2020-05-29 2020-09-04 一汽解放汽车有限公司 Self-adaptive EGR control method based on engine nitrogen and oxygen emission

Also Published As

Publication number Publication date
CN115614170A (en) 2023-01-17

Similar Documents

Publication Publication Date Title
US7031824B2 (en) Multivariable actuator control for an internal combustion engine
US7757549B2 (en) Apparatus, system, and method for predictive control of a turbocharger
CN101657624B (en) System for controlling the exhaust gas return rate by means of virtual nox sensors with adaptation via a nox sensor
US9010180B2 (en) Method and observer for determining the exhaust manifold temperature in a turbocharged engine
KR101554469B1 (en) Device for controlling the exhaust-gas turbocharging of an internal combustion engine, and internal combustion engine
JP7191199B2 (en) internal combustion engine controller
GB2424963A (en) Controlling i.c. engine turbocharger compressor surge using EGR flow
US9482169B2 (en) Optimization-based controls for diesel engine air-handling systems
US20100170244A1 (en) Robust multiple input multiple output control in a high variability system
JP2008261300A (en) Exhaust gas recirculation device for internal combustion engine
US20170030260A1 (en) Control device of an engine
JP5035097B2 (en) Surge avoidance control system for multi-stage turbocharging system
JP2020060140A (en) Control system of egr electric valve
US10012158B2 (en) Optimization-based controls for an air handling system using an online reference governor
CN115614170B (en) Correction optimization method, device and equipment for target opening degree of EGR valve and storage medium
CN115516197B (en) Internal combustion engine control device
JP2007303380A (en) Exhaust control device for internal combustion engine
JP4228953B2 (en) Control device for internal combustion engine
JP2014118883A (en) Control device of internal combustion engine
CN115585070B (en) Method, device, equipment and storage medium for regulating minimum EGR rate
CN115680915B (en) Method, device, equipment and storage medium for designing minimum EGR rate
CN109973260A (en) Exhaust gas recirculation system for internal combustion engines
WO2019198320A1 (en) Internal combustion engine control device and control method
JP3622506B2 (en) EGR control device for internal combustion engine
US20170030277A1 (en) Method for processing sensor signals

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant