CN116537963A - EGR rate adjusting method and device of EGR system, computer equipment and medium - Google Patents

EGR rate adjusting method and device of EGR system, computer equipment and medium Download PDF

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Publication number
CN116537963A
CN116537963A CN202310753475.7A CN202310753475A CN116537963A CN 116537963 A CN116537963 A CN 116537963A CN 202310753475 A CN202310753475 A CN 202310753475A CN 116537963 A CN116537963 A CN 116537963A
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CN
China
Prior art keywords
egr
automobile
egr rate
egr system
engine
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310753475.7A
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Chinese (zh)
Inventor
张聪
王谋举
贾凯
路汉文
任星
陈国星
侯玉晶
马荣勇
李志明
王建勇
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FAW Group Corp
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FAW Group Corp
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Publication date
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Priority to CN202310753475.7A priority Critical patent/CN116537963A/en
Publication of CN116537963A publication Critical patent/CN116537963A/en
Pending legal-status Critical Current

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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]
    • F02D41/006—Controlling exhaust gas recirculation [EGR] using internal EGR
    • F02D41/0062—Estimating, calculating or determining the internal EGR rate, amount or flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
    • 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
    • F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
    • 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)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

The embodiment of the invention discloses an EGR rate adjusting method, an EGR rate adjusting device, computer equipment and a medium of an EGR system, wherein the EGR rate adjusting method of the EGR system is applied to an engine of an automobile and comprises the following steps: acquiring the motion state of the automobile according to an external sensor of the automobile; starting an EGR system under the condition that the motion state meets the working condition of the EGR system of the engine; calculating an initial EGR rate of the EGR system; determining a correction factor for initializing the EGR rate according to the pressure condition of the automobile; and determining a corrected EGR rate according to the correction factor. The adjusting method provided by the embodiment of the invention firstly judges whether the EGR system is started, and corrects the EGR rate according to the pressure condition after the EGR system is started, so that the determined EGR rate is more accurate, and the benefit of the EGR system is ensured on the basis of balancing the power loss of the automobile engine.

Description

EGR rate adjusting method and device of EGR system, computer equipment and medium
Technical Field
The invention relates to the technical field of engine compression ratio adjustment, in particular to an EGR rate adjustment method, an EGR rate adjustment device, computer equipment and a medium of an EGR system.
Background
At present, hybrid electric vehicles are gradually becoming a new trend in the automobile industry, and engines carrying hybrid electric vehicles are also commonly low-oil consumption special hybrid electric engines developed by main factories. Wherein the mounting of a low pressure EGR system on a gasoline engine has become one of the main options.
Mainly because low pressure EGR systems on the one hand can improve engine efficiency, improve fuel economy, and in addition can reduce the emission levels of gaseous emissions. However, the engine equipped with the EGR system has drawbacks.
Disclosure of Invention
In view of the above, the embodiments of the present invention provide a method, an apparatus, a computer device, and a medium for adjusting an EGR rate of an EGR system, which can determine the EGR system and the EGR rate more accurately, and ensure the benefit of the EGR system on the basis of balancing the power loss of an engine of an automobile.
In a first aspect, an embodiment of the present invention provides a method for adjusting an EGR rate of an EGR system, which is applied to an engine of an automobile, including:
acquiring the motion state of the automobile according to an external sensor of the automobile;
starting an EGR system of the engine under operating conditions in which the state of motion satisfies the EGR system;
calculating an initial EGR rate of the EGR system;
determining a correction factor of the initialized EGR rate according to the pressure condition of the automobile;
and determining a corrected EGR rate according to the correction factor.
In a second aspect, an embodiment of the present invention provides an EGR rate adjusting device for an EGR system, which is applied to an engine of an automobile, including:
the motion state acquisition module is used for acquiring the motion state of the automobile according to an external sensor of the automobile;
an EGR system start module for starting an EGR system of the engine under conditions in which the motion state satisfies an operating condition of the EGR system;
an initial EGR rate determination module for calculating an initial EGR rate of the EGR system;
the correction factor determining module is used for determining the correction factor of the initialized EGR rate according to the pressure condition of the automobile;
and the corrected EGR rate determination module is used for determining a corrected EGR rate according to the correction factor.
In a third aspect, an embodiment of the present invention provides a computer device, including:
one or more processors;
storage means for storing one or more programs,
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of adjusting an EGR rate of an EGR system of any of the first aspect.
In a fourth aspect, an embodiment of the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for adjusting an EGR rate of an EGR system according to any of the first aspects.
According to the EGR rate adjusting method of the EGR system, whether the EGR system is started or not is determined according to the motion state of the automobile, the dynamic loss of the automobile engine can be weighed, and the working efficiency of the automobile engine is guaranteed. Furthermore, the initial EGR rate is determined by starting the EGR system, and the EGR rate is corrected according to the pressure condition, so that the determined EGR rate is more accurate, the benefits of automobile starting in the EGR system, namely more energy conservation, are ensured, and the method is more friendly to the environment.
Drawings
In order to more clearly illustrate the technical solution of the exemplary embodiments of the present invention, a brief description is given below of the drawings required for describing the embodiments. It is obvious that the drawings presented are only drawings of some of the embodiments of the invention to be described, and not all the drawings, and that other drawings can be made according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for adjusting an EGR rate of an EGR system according to an embodiment of the present invention;
fig. 2 is a flow chart of a method for adjusting an EGR rate of an EGR system according to a second embodiment of the present invention;
fig. 3 is a schematic structural view of an EGR rate adjusting device of an EGR system according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a computer device according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be fully described below by way of specific embodiments with reference to the accompanying drawings in the examples of the present invention. It is apparent that the described embodiments are some, but not all, embodiments of the present invention, and that all other embodiments, which a person of ordinary skill in the art would obtain without making inventive efforts, are within the scope of this invention.
Example 1
Fig. 1 is a flowchart of a method for adjusting an EGR rate of an EGR system according to an embodiment of the present invention, and referring to fig. 1, the method may be implemented by an apparatus for adjusting an EGR rate of an EGR system according to an embodiment of the present invention, where the system may be implemented by software and/or hardware, and the system may be integrated with an adjustment device including an engine, and the method specifically includes the following steps:
s110, acquiring the motion state of the automobile according to an external sensor of the automobile.
The speed, the temperature and the like of the automobile are different under different movement states in the running process of the automobile. Different movement states of the motor vehicle can be detected by means of external sensors.
Optionally, acquiring the current speed of the automobile according to a speed sensor; acquiring the current environmental temperature of the automobile according to an environmental sensor; and acquiring the current water temperature of the engine according to the water temperature sensor.
Specifically, the motion state of the automobile may include the current running speed of the automobile, the ambient temperature, the water temperature of the engine, and the like, and the motion state may be obtained by a relative sensor to obtain specific parameter information. That is, the current speed of the automobile is obtained from the speed sensor, the current ambient temperature of the automobile is obtained from the ambient sensor, and the current water temperature of the engine is obtained from the water temperature sensor.
S120, starting the EGR system under the condition that the motion state meets the working condition of the EGR system of the engine.
The EGR system is an exhaust gas recirculation system, which is a technology that is used to re-introduce a part of exhaust gas separated after combustion in an engine to an intake side of the engine for combustion. The main purpose is to reduce nitrogen oxides and the like in exhaust gas while sharing part of the load of an engine, and also to improve fuel consumption. In general, an engine of an automobile is provided with an EGR system, so that the requirements of energy conservation and emission reduction can be met, and meanwhile, the workload of the engine can be reduced. According to the engine provided by the embodiment of the invention, when the motion state of the automobile meets the state when the EGR system is started, namely the utilization of the EGR system is more efficient, so that the problem that the EGR system does not influence the working effect of the engine when the EGR system is not required to be started is avoided, and the overall driving experience of the automobile is ensured.
Optionally, the EGR system is started under operating conditions of the EGR system for the engine where the current vehicle speed, the current ambient temperature, and the water temperature are all satisfied.
Specifically, when the start judgment criterion of the EGR system is that the related information acquired by the corresponding sensor simultaneously meets the preset condition, it is determined that the EGR system can be opened, that is, a valve of the EGR system is opened. For example, for a current vehicle speed, the preset condition is greater than or equal to 20 km/h, the preset condition for the current ambient temperature is greater than 80 ℃, and when the preset condition for the water temperature of the engine is greater than 70 ℃, the EGR system can be started only when all three meet the preset condition, and it is noted that the numerical value of the preset condition is not specifically limited in the embodiment of the present invention.
S130, calculating the initial EGR rate of the EGR system.
Specifically, in the EGR system, the EGR rate is a ratio of the amount of exhaust gas introduced into the engine to the total intake air flow rate. For automobiles in different environments, the EGR rate may be different, i.e., in the area of higher altitude, i.e., in the case of higher pressure, the total intake air flow of the engine itself may be reduced. Therefore, under different environments or different altitudes, the ratio of the introduced exhaust gas amount to the total intake air flow in the EGR system may be different, so that in order to ensure the optimal state of the ratio of the introduced exhaust gas amount to the total intake air flow in the EGR system, the initial EGR rate of the started EGR system may be corrected and adjusted later.
S140, determining a correction factor for initializing the EGR rate according to the pressure condition of the automobile.
The automobile provided by the embodiment of the invention can correct the initialized EGR rate according to the pressure conditions, so that the ratio of the introduced exhaust gas quantity and the total air inlet flow in the EGR system is ensured to be the optimal working state. Specifically, the correction factors of the automobile on the initialized EGR rate under different pressure conditions are determined, so that the accuracy of the EGR rate can be ensured through the determination of the correction factors, and the working efficiency and the emission reduction effect of the automobile engine are further ensured.
S150, determining a corrected EGR rate according to the correction factors.
Specifically, under the condition of determining the correction factor, the initial EGR rate is corrected to obtain the corrected EGR rate, and the determined corrected EGR rate is the optimal adjustment condition of the exhaust gas recirculation system in the current state of the automobile. The initial EGR rate may be a, and the determined correction factor may be b, and the corrected EGR rate may be b×a.
In summary, according to the method for adjusting the EGR rate of the EGR system, whether the EGR system is started or not is determined according to the motion state of the automobile, so that the dynamic loss of the automobile engine can be weighed, and the working efficiency of the automobile engine is ensured. Furthermore, the initial EGR rate is determined by starting the EGR system, and the EGR rate is corrected according to the pressure condition, so that the determined EGR rate is more accurate, the benefits of automobile starting in the EGR system, namely more energy conservation, are ensured, and the method is more friendly to the environment.
Example two
Fig. 2 is a schematic flow chart of an EGR rate adjusting method of an EGR system according to a second embodiment of the present invention, and is shown in fig. 2, where details of how the EGR rate is corrected are refined based on the above-mentioned embodiment. In this embodiment, the method specifically includes the following steps:
s210, acquiring a plurality of standard EGR rates of the automobile at a plurality of altitudes.
S220, drawing a pre-lookup table according to the altitude and the standard EGR rate.
The method is based on the fact that the total air inlet flow of the engine is affected under the condition of different pressures of the automobile, and therefore the EGR rate of the EGR system is affected. Furthermore, the engine further comprises a supercharger, the capacity margin of the supercharger can be weakened along with the increase of pressure, the EGR rate can be guaranteed to be the optimal EGR rate of the current automobile condition through adjusting the EGR rate to a critical value for guaranteeing zero margin of the supercharger, and the optimal states of emission reduction, energy saving and power can be achieved. The different pressure conditions are most intuitively reflected as the pressure conditions of the automobile at different altitudes, and further, the EGR rate of the automobile under the critical value state that the supercharger margin is zero can be measured at different altitudes in the automobile test stage, the obtained EGR rate is the standard EGR rate, the standard EGR rate and the corresponding altitude are summarized to obtain the correction factor corresponding to the standard EGR rate, and the pre-lookup table is prepared to be recorded into the EGR system, so that the corresponding standard EGR rate can be conveniently found in different driving states. For example, the highest EGR rate that an engine can achieve at multiple altitude points of 1000 meters, 1250 meters, 1500 meters, 1750 meters, etc. with a supercharger margin of zero may be selected for an automobile.
S230, acquiring the motion state of the automobile according to an external sensor of the automobile.
S240, starting the EGR system under the condition that the motion state meets the working condition of the EGR system of the engine.
S250, calculating the initial EGR rate of the EGR system.
S260, determining the initial altitude of the automobile.
The initial altitude of the automobile can be determined through a pressure sensor to determine the current pressure condition of the engine, and the current altitude of the automobile can also be determined through a positioning system. Different altitudes also reflect different pressure conditions. The engine of an automobile may have a difference in the ability of the total intake air amount of the engine in the EGR system under different pressure conditions.
S270, closing the EGR system when the initial altitude is greater than the preset altitude.
Specifically, when the determined initial altitude is greater than the preset altitude, that is, under the pressure, the total air intake flow of the engine is limited, if the EGR system is started, the working efficiency of the engine is affected, driving feeling such as jolt is generated, and therefore the power effect of the engine is affected, and meanwhile, the experience of a driver cannot be guaranteed. For example, the preset height may be 2000 meters, and based on a specific preset height value, the preset height may be adaptively adjusted according to the actual engine operating efficiency.
S280, introducing a correction factor to correct the initial EGR rate when the initial altitude is smaller than or equal to the preset altitude meter.
Specifically, when the determined initial altitude is smaller than or equal to the preset altitude, namely under the pressure, the total air inlet flow of the engine can be ensured, namely the working efficiency of the engine is not influenced when the EGR system is started, meanwhile, the whole energy conservation and emission reduction can be realized, and the emission condition of the engine can also meet the emission test (Real Drive Emission, RDE) of the actual driving pollutants, so that the power effect of the engine is ensured, the emission reduction effect is ensured, the waste gas is recycled, and the energy is saved. For example, the preset height may be 2000 meters, and based on a specific preset height value, the preset height may be adaptively adjusted according to the actual engine operating efficiency.
S290, determining the real-time altitude.
Under the condition that the EGR system is started according to the initial altitude, the real-time altitude of the automobile is determined according to different states of the automobile at different moments, the EGR rate can be further and more finely adjusted according to the real-time altitude, the power effect of the engine is guaranteed, and meanwhile energy conservation and emission reduction of the engine are guaranteed.
Optionally, the real-time altitude of the vehicle is determined from pressure sensors and/or an on-board positioning system.
Specifically, the real-time altitude of the automobile can be obtained according to the positioning system to position the automobile in real time, and the pressure of the current engine can be obtained according to the pressure sensor of the engine. Different altitudes also reflect different pressure conditions. The engine of an automobile may have a difference in the ability of the total intake air amount of the engine in the EGR system under different pressure conditions.
And S2100, determining a correction factor according to the real-time altitude bringing-in pre-lookup table.
Specifically, in the test stage of the automobile, correction factors corresponding to the initial EGR rate can be obtained from different altitudes, or correction factors corresponding to the initial EGR rate under different pressure conditions can be obtained, and the initial EGR rate is corrected based on the correction factors, so that the corresponding standard EGR rate is found under different running states of the automobile.
S2110, determining a corrected EGR rate according to the correction factor.
In summary, the method for adjusting the EGR rate of the EGR system provided by the embodiment of the invention carries out finer adjustment based on different states of the automobile, so that the determined EGR rate is more accurate, the benefit of automobile starting in the EGR system is ensured, namely, the method is more energy-saving and is more friendly to the environment.
Example III
Fig. 3 is a schematic structural diagram of an EGR rate adjusting device of an EGR system according to a third embodiment of the present invention, which may be applied to a product having an engine, wherein the device may be implemented in software and/or hardware.
As shown in fig. 3, the EGR rate adjusting device 10 of the EGR system includes: the state of motion acquisition module 100, the EGR system start module 200, the initial EGR rate determination module 300, the correction factor determination module 400, and the corrected EGR rate determination module 500.
The motion state acquisition module 100 is configured to acquire a motion state of the automobile according to an external sensor of the automobile.
An EGR system start module 200 for starting an EGR system of an engine under operating conditions that the state of motion satisfies the EGR system.
The initial EGR rate determination module 300 is configured to calculate an initial EGR rate for the EGR system.
The correction factor determining module 400 is configured to determine a correction factor for initializing the EGR rate according to the pressure condition of the vehicle.
The corrected EGR rate determination module 500 is configured to determine a corrected EGR rate based on the correction factor.
In summary, the adjusting device for the EGR rate in the EGR system provided by the embodiment of the invention can determine whether to start the EGR system according to the motion state of the automobile, can weigh the dynamic loss of the automobile engine and ensures the working efficiency of the automobile engine. Furthermore, the EGR rate can be corrected according to the pressure condition, so that the determined EGR rate is more accurate, the benefits of automobile starting in an EGR system are ensured, namely, more energy is saved, and the method is more friendly to the environment.
Example IV
Fig. 4 is a schematic structural diagram of a computer device according to a fourth embodiment of the present invention, where, as shown in fig. 4, the computing device according to the embodiment of the present invention includes: one or more processors 41 and a storage device 42; the number of processors 41 in the device may be one or more, one processor 41 being taken as an example in fig. 4; the storage device 42 is used for storing one or more programs; the one or more programs are executed by the one or more processors 41, so that the one or more processors 41 implement a method of adjusting the EGR rate of the EGR system according to any of the embodiments of the present invention.
The processor 41, the storage means 42, the input means 43 and the output means 44 in the device may be connected by a bus or by other means, in fig. 4 by way of example.
The storage device 42 in the apparatus is used as a computer readable storage medium, and may be used to store one or more programs, which may be software programs, computer executable programs, and modules, such as program instructions/modules corresponding to the method for adjusting the EGR rate of the EGR system provided in the embodiment of the present invention (for example, as shown in fig. 3, the device 10 for adjusting the EGR rate of the EGR system includes a motion state acquisition module 100, an EGR system start module 200, an initial EGR rate determination module 300, a correction factor determination module 400, and a corrected EGR rate determination module 500). The processor 41 executes various functional applications of the terminal device and data processing by running software programs, instructions and modules stored in the storage device 42, i.e., implements the method of adjusting the EGR rate of the EGR system in the above-described method embodiment.
The storage device 42 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the device, etc. In addition, the storage 42 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, storage 42 may further include memory located remotely from processor 41, which may be connected to the device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input means 43 may be used to receive entered numeric or character information and to generate key signal inputs related to user settings and function control of the device. The output device 44 may include a display device such as a display screen.
And, when one or more programs included in the above-described apparatus are executed by the one or more processors 41, the programs perform the following operations: acquiring the motion state of the automobile according to an external sensor of the automobile; starting an EGR system under the condition that the motion state meets the working condition of the EGR system of the engine; calculating an initial EGR rate of the EGR system; determining a correction factor for initializing the EGR rate according to the pressure condition of the automobile; and determining a corrected EGR rate according to the correction factor.
Example five
A fifth embodiment of the present invention provides a computer-readable storage medium having stored thereon a computer program for executing a method of adjusting a compression ratio of an engine when executed by a processor, the method comprising: acquiring the motion state of the automobile according to an external sensor of the automobile; starting an EGR system under the condition that the motion state meets the working condition of the EGR system of the engine; calculating an initial EGR rate of the EGR system; determining a correction factor for initializing the EGR rate according to the pressure condition of the automobile; and determining a corrected EGR rate according to the correction factor.
Optionally, the program may be further configured to perform the method for adjusting the EGR rate of the EGR system according to any of the embodiments of the present invention when executed by the processor.
The computer storage media of embodiments of the invention may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access Memory (Random Access Memory, RAM), a Read-Only Memory (ROM), an erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), a flash Memory, an optical fiber, a portable CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. A computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to: electromagnetic signals, optical signals, or any suitable combination of the preceding. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, radio frequency (RadioFrequency, RF), and the like, or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims (10)

1. An EGR rate adjustment method for an EGR system, applied to an engine of an automobile, comprising:
acquiring the motion state of the automobile according to an external sensor of the automobile;
starting an EGR system of the engine under operating conditions in which the state of motion satisfies the EGR system;
calculating an initial EGR rate of the EGR system;
determining a correction factor of the initialized EGR rate according to the pressure condition of the automobile;
and determining a corrected EGR rate according to the correction factor.
2. The adjustment method according to claim 1, characterized in that the determination of the correction factor for the initialized EGR rate from the pressure conditions of the vehicle comprises:
determining an initial altitude of the car;
closing the EGR system when the initial altitude is greater than a preset altitude;
and when the initial altitude is smaller than or equal to a preset altitude, introducing the correction factor to correct the initial EGR rate.
3. The adjustment method according to claim 2, characterized in that, after introducing the correction factor to correct the initial EGR rate when the real-time altitude is less than or equal to a preset altitude, comprising:
determining a real-time altitude;
and determining the correction factors according to the real-time altitude brought into a pre-lookup table, wherein the pre-lookup table comprises the correction factors corresponding to different real-time altitudes.
4. The adjustment method of claim 3, wherein the engine further comprises a supercharger;
acquiring the motion state of the automobile according to an external sensor of the automobile, wherein the method further comprises the following steps:
acquiring a plurality of standard EGR rates of the automobile at a plurality of altitudes, wherein the supercharger margin is zero at the standard EGR rates;
and drawing the pre-lookup table according to the altitude and the standard EGR rate.
5. A method of adjusting as defined in claim 3, wherein determining the real-time altitude comprises:
and determining the real-time altitude of the automobile according to the pressure sensor and/or the vehicle-mounted positioning system.
6. The adjustment method according to claim 1, characterized in that acquiring the motion state of the car from an external sensor of the car comprises:
acquiring the current speed of the automobile according to a speed sensor;
acquiring the current ambient temperature of the automobile according to an ambient sensor;
and acquiring the current water temperature of the engine according to a water temperature sensor.
7. The adjustment method according to claim 6, characterized in that starting the EGR system in the state of motion that satisfies the operating condition of the EGR system of the engine comprises:
and starting the EGR system under the working condition that the current vehicle speed, the current environment temperature and the water temperature all meet the EGR system of the engine.
8. An EGR rate adjusting device of an EGR system, which is applied to an engine of an automobile, comprising:
the motion state acquisition module is used for acquiring the motion state of the automobile according to an external sensor of the automobile;
an EGR system start module for starting an EGR system of the engine under conditions in which the motion state satisfies an operating condition of the EGR system;
an initial EGR rate determination module for calculating an initial EGR rate of the EGR system;
the correction factor determining module is used for determining the correction factor of the initialized EGR rate according to the pressure condition of the automobile;
and the corrected EGR rate determination module is used for determining a corrected EGR rate according to the correction factor.
9. A computer device, the computer device comprising:
one or more processors;
storage means for storing one or more programs,
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of adjusting an EGR rate of an EGR system of any of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements a method for adjusting the EGR rate of an EGR system according to any of claims 1-7.
CN202310753475.7A 2023-06-25 2023-06-25 EGR rate adjusting method and device of EGR system, computer equipment and medium Pending CN116537963A (en)

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CN202310753475.7A CN116537963A (en) 2023-06-25 2023-06-25 EGR rate adjusting method and device of EGR system, computer equipment and medium

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CN116537963A true CN116537963A (en) 2023-08-04

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