CN116641793A - Abnormality detection method and device for engine, vehicle and storage medium - Google Patents

Abnormality detection method and device for engine, vehicle and storage medium Download PDF

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Publication number
CN116641793A
CN116641793A CN202310677413.2A CN202310677413A CN116641793A CN 116641793 A CN116641793 A CN 116641793A CN 202310677413 A CN202310677413 A CN 202310677413A CN 116641793 A CN116641793 A CN 116641793A
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CN
China
Prior art keywords
cylinder
cylinder pressure
engine
difference value
maximum
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CN202310677413.2A
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Chinese (zh)
Inventor
刘国臣
宋欣
彭超超
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Great Wall Motor Co Ltd
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Great Wall Motor Co Ltd
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Priority to CN202310677413.2A priority Critical patent/CN116641793A/en
Publication of CN116641793A publication Critical patent/CN116641793A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating or supervising devices
    • F02B77/083—Safety, indicating or supervising devices relating to maintenance, e.g. diagnostic device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating or supervising devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

The application discloses an abnormality detection method, an abnormality detection device, a vehicle and a storage medium of an engine, wherein the abnormality detection method is applied to the technical field of vehicles, the engine comprises a plurality of cylinders and fuel injectors corresponding to each cylinder, and the abnormality detection method comprises the following steps: in the process that a plurality of cylinders of an engine circularly work according to a preset sequence, obtaining a difference value between the maximum cylinder pressure of a current cylinder in a target stroke and the maximum cylinder pressure of a previous cylinder in the target stroke to obtain a maximum cylinder pressure difference value; whether an abnormality occurs in the engine is determined based on the maximum cylinder pressure difference value. The method can monitor the running condition of the engine in real time, discover problems in time, reduce the occurrence probability of major faults and ensure the safety of drivers and passengers.

Description

Abnormality detection method and device for engine, vehicle and storage medium
Technical Field
The present application relates to the field of vehicle technology, and more particularly, to an abnormality detection method of an engine, an abnormality detection device of an engine, a vehicle, and a storage medium in the field of vehicles.
Background
When the engine works, the cylinder is abnormal in work due to air leakage of the cylinder and the fact that the oil injector cannot normally spray oil, for example, the oil injector can be blocked or jammed during the operation of the engine, single-cylinder or multi-cylinder operation of the engine is abnormal, and under severe conditions, the engine is flameout, so that traffic accidents are caused.
Therefore, whether the cylinder and the oil injector fail is an important performance index for influencing the normal operation of the engine. In the prior art, in order to prevent faults of the cylinder and the fuel injector, verification tests of the fuel injector and the cylinder are required to be carried out in the development process of the engine, and the working state of the engine is judged by monitoring the running condition of each cylinder of the engine. Meanwhile, the method is used for establishing a test database so as to evaluate the design quality of the fuel injector and the air cylinder and evaluate the reliability of the engine. However, the method cannot detect the running condition of the engine in real time, and traffic accidents are easy to occur.
Disclosure of Invention
The present application aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present application is to provide an abnormality detection method for an engine, in which, during a process of circularly operating a plurality of cylinders of the engine according to a preset sequence, a maximum cylinder pressure difference value is obtained by obtaining a difference value between a maximum cylinder pressure of a current cylinder in a target stroke and a maximum cylinder pressure of a previous cylinder in the target stroke, and whether the engine is abnormal or not is determined based on the maximum cylinder pressure difference value, so that the running condition of the engine can be monitored in real time, problems can be found in time, the occurrence probability of major faults is reduced, and the safety of drivers and passengers is ensured.
A second object of the present application is to provide an abnormality detection device for an engine.
A third object of the present application is to propose a vehicle.
A fourth object of the present application is to propose a computer readable storage medium.
To achieve the above object, an embodiment of a first aspect of the present application provides an abnormality detection method of an engine including a plurality of cylinders each having a plurality of strokes and an injector provided for each cylinder, the method including: in the process that a plurality of cylinders of an engine circularly work according to a preset sequence, obtaining a difference value between the maximum cylinder pressure of a current cylinder in a target stroke and the maximum cylinder pressure of a previous cylinder in the target stroke to obtain a maximum cylinder pressure difference value; whether an abnormality occurs in the engine is determined based on the maximum cylinder pressure difference value.
According to the abnormality detection method of the engine, firstly, in the process that a plurality of cylinders of the engine circularly work according to a preset sequence, the difference value of the maximum cylinder pressure of the current cylinder in a target stroke and the maximum cylinder pressure of the previous cylinder in the target stroke is obtained, the maximum cylinder pressure difference value is obtained, and then whether the engine is abnormal or not is determined based on the maximum cylinder pressure difference value. Therefore, the method can monitor the running condition of the engine in real time, discover problems in time, reduce the occurrence probability of major faults and ensure the safety of drivers and passengers.
In addition, the abnormality detection method of an engine according to the above-described embodiment of the application may further have the following additional technical features:
according to one embodiment of the present application, determining whether an abnormality occurs in an engine based on a maximum cylinder pressure difference value includes: when the target stroke is a compression stroke, determining whether the current cylinder is abnormal or not based on a maximum cylinder pressure difference value corresponding to the compression stroke; and when the target stroke is the power stroke, determining whether the fuel injector corresponding to the current cylinder is abnormal or not based on the maximum cylinder pressure difference value corresponding to the power stroke.
According to one embodiment of the present application, determining whether an abnormality occurs in a current cylinder based on a maximum cylinder pressure difference value corresponding to a compression stroke includes: and when the maximum cylinder pressure difference value corresponding to the compression stroke is larger than a first cylinder pressure threshold value, determining that the current cylinder is abnormal, wherein the first cylinder pressure threshold value is determined based on the oil injection quantity corresponding to the working cycle of the current cylinder in the compression stroke.
According to an embodiment of the present application, after determining that abnormality occurs in the current cylinder, the abnormality detection method of the engine further includes: if the maximum cylinder pressure difference value corresponding to the compression stroke is smaller than the second cylinder pressure threshold value, sending out cylinder abnormality reminding information; wherein the second cylinder pressure threshold is greater than the first cylinder pressure threshold; if the maximum cylinder pressure difference value corresponding to the compression stroke is greater than or equal to the second cylinder pressure threshold value, determining that the current cylinder fails, and sending out cylinder failure reminding information.
According to one embodiment of the present application, determining whether an abnormality occurs in an injector corresponding to a current cylinder based on a maximum cylinder differential pressure value corresponding to a power stroke includes: and when the maximum cylinder pressure difference value corresponding to the power stroke is larger than a third cylinder pressure threshold value, determining that the fuel injector corresponding to the current cylinder is abnormal, wherein the third cylinder pressure threshold value is determined based on the fuel injection quantity corresponding to the working cycle of the current cylinder in the power stroke.
According to one embodiment of the present application, after determining that an abnormality occurs in the injector corresponding to the current cylinder, the abnormality detection method of the engine further includes: if the maximum cylinder pressure difference value corresponding to the power stroke is smaller than a fourth cylinder pressure threshold value, sending out abnormal reminding information of the fuel injector, wherein the fourth cylinder pressure threshold value is larger than the third cylinder pressure threshold value; if the maximum cylinder pressure difference value corresponding to the power stroke is greater than or equal to the fourth cylinder pressure threshold value, determining that the fuel injector corresponding to the current cylinder fails, and sending fuel injector failure reminding information and/or increasing the fuel injection quantity of a normal fuel injector.
According to an embodiment of the present application, the abnormality detection method of an engine further includes: acquiring oil injection quantity of a current cylinder and a previous cylinder in a power stroke; and under the condition that the oil injection quantity of the current cylinder and the previous cylinder in the power stroke is the same, determining whether the oil injector corresponding to the current cylinder is abnormal or not based on the maximum cylinder pressure difference value corresponding to the power stroke.
To achieve the above object, a second aspect of the present application provides an abnormality detection apparatus for an engine including a plurality of cylinders each having a plurality of strokes and an injector provided for each cylinder, the apparatus comprising: the acquisition module is used for acquiring the difference value between the maximum cylinder pressure of the current cylinder in the target stroke and the maximum cylinder pressure of the previous cylinder in the target stroke in the process of circularly working a plurality of cylinders of the engine according to a preset sequence to obtain a maximum cylinder pressure difference value; the determining module is used for determining whether the engine is abnormal or not based on the maximum cylinder pressure difference value.
According to the abnormality detection device of the engine, the acquisition module is used for acquiring the difference value between the maximum cylinder pressure of the current cylinder in the target stroke and the maximum cylinder pressure of the previous cylinder in the target stroke in the process that a plurality of cylinders of the engine circularly work according to the preset sequence, so as to obtain the maximum cylinder pressure difference value; the determination module is configured to determine whether an abnormality occurs in the engine based on the maximum cylinder pressure difference value. Therefore, the device can monitor the running condition of the engine in real time, discover problems in time, reduce the occurrence probability of major faults and ensure the safety of drivers and passengers.
In order to achieve the above object, a vehicle according to an embodiment of the present application includes a memory, a processor, and a program stored in the memory and executable on the processor, wherein the processor implements the method for detecting an abnormality of an engine when executing the program.
According to the vehicle provided by the embodiment of the application, the running condition of the engine can be monitored in real time by executing the abnormality detection method of the engine, so that problems can be found in time, the occurrence probability of major faults is reduced, and the safety of drivers and passengers is ensured.
To achieve the above object, a fourth aspect of the present application provides a computer-readable storage medium having stored thereon a program which, when executed by a processor, implements the above-described abnormality detection method of an engine.
According to the computer readable storage medium, the engine running condition can be monitored in real time, problems can be found in time, the occurrence probability of major faults is reduced, and the safety of drivers and passengers is ensured by implementing the abnormality detection method of the engine.
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
Fig. 1 is a flowchart of an abnormality detection method of an engine according to an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating operation of a compression stroke of an engine according to an embodiment of the present application;
FIG. 3 is a schematic diagram of the operation of an engine power stroke according to an embodiment of the present application;
FIG. 4 is a flowchart of an engine anomaly detection method according to one specific example of the present application;
FIG. 5 is a flowchart of an engine anomaly detection method according to another specific example of the present application;
fig. 6 is a block schematic diagram of an abnormality detection device of an engine according to an embodiment of the application;
fig. 7 is a block schematic diagram of a vehicle according to an embodiment of the application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
In order to determine whether the cylinder and the oil sprayer are faulty, in the development process of the engine, the traditional mode needs to perform verification tests of the oil sprayer and the cylinder, and the working state of the engine is judged by monitoring the running condition of each cylinder of the engine. Meanwhile, the method is used for establishing a test database so as to evaluate the design quality of the fuel injector and the air cylinder and evaluate the reliability of the engine. However, the database is complex to build, and the running condition of each cylinder is monitored, so that the application provides an abnormality detection method of the engine, which can monitor the running condition of the engine in real time, discover problems in time, reduce the occurrence probability of serious faults and ensure the safety of drivers and passengers.
In one embodiment of the present application, as shown in FIG. 2, the maximum pressure value in the compression state is reached in the cylinder during the compression stroke, and as shown in FIG. 3, the injector injects fuel into the cylinder during the power stroke, and the fuel in the cylinder is combusted to do power, pushing the piston downward, and the explosion pressure in the cylinder reaches the maximum value during the stroke. In addition, the cylinder pressure sensor is arranged in the engine cylinder and is connected with an engine ECU (Electronic Control Unit ) so as to acquire the cylinder pressure value in the engine cylinder under different strokes of the engine, and the ECU is simultaneously connected with an engine oil injector and can control the oil injection quantity, for example, the oil injection quantity can be continuously corrected according to a gas pressure sensor, a water temperature sensor, an air inlet temperature sensor, an oxygen sensor and the like.
An abnormality detection method of an engine, an abnormality detection apparatus of an engine, a vehicle, and a computer-readable storage medium according to embodiments of the present application are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of an abnormality detection method of an engine according to an embodiment of the present application.
As shown in fig. 1, the abnormality detection method of the engine according to the embodiment of the application may include the steps of:
s1, obtaining a difference value between the maximum cylinder pressure of the current cylinder in a target stroke and the maximum cylinder pressure of the previous cylinder in the target stroke in the process that a plurality of cylinders of the engine circularly work according to a preset sequence, and obtaining a maximum cylinder pressure difference value. The preset sequence can be determined according to practical situations.
S2, determining whether the engine is abnormal or not based on the maximum cylinder pressure difference value.
Specifically, in one embodiment of the present application, the engine may include a plurality of cylinders, e.g., the engine may be a 2-cylinder engine, a 3-cylinder engine, a 4-cylinder engine, etc., for example, a 4-cylinder engine, an injector may be provided for each cylinder, and each cylinder may have a plurality of strokes, i.e., an intake stroke, a compression stroke, a power stroke, and an exhaust stroke. During the running of the vehicle, every 2 circles (720) of the crankshaft, the single cylinder of the engine works 1 time, the sequence of the engine cylinder sequentially igniting in one working cycle is called an engine ignition sequence, and the ignition sequence can be determined according to the actual situation, for example, the ignition sequence can be 1-3-4-2.
In the process that a plurality of cylinders of the engine circularly work according to a preset sequence, the maximum cylinder pressure value of the current cylinder in a target stroke can be obtained, for example, the maximum cylinder pressure value under the current stroke can be detected through a cylinder pressure sensor, wherein the cylinder pressure sensor is arranged in the cylinder of the engine, and a pneumatic pressure-sensitive semiconductor element can be used for the cylinder pressure sensor. In order to more accurately judge whether the engine is abnormal or not, the maximum cylinder pressure of the previous cylinder in the target stroke is required to be obtained, for example, in a four-cylinder engine with the ignition sequence of 1-3-4-2, the maximum cylinder pressure value of the 1 st cylinder in the target stroke is firstly determined, the maximum cylinder pressure value of the previous cylinder, namely the 2 nd cylinder in the target stroke is determined, after the maximum cylinder pressure values of two adjacent cylinders in the target stroke are respectively obtained, the maximum cylinder pressure values can be differentiated, and the absolute value of the obtained result can be used as the maximum cylinder pressure difference value. Namely, the cylinder pressure value of the current cylinder and the cylinder pressure value of the previous cylinder are differenced under the target stroke, so that dynamic real-time monitoring in the process that a plurality of cylinders of the engine circularly work according to a preset sequence can be realized, and the dynamic real-time monitoring is a more real value instead of a theoretical value.
After the maximum cylinder pressure difference value is obtained, whether the engine is abnormal or not can be determined according to the maximum cylinder pressure difference, for example, when the maximum cylinder pressure difference value is larger than a certain set value, the engine is determined to be abnormal, and when the maximum cylinder pressure difference value is smaller than a certain set value, the engine is determined to be not abnormal. Therefore, the method can monitor the running condition of the engine in real time, discover problems in time, reduce the occurrence probability of major faults and ensure the safety of drivers and passengers.
The specific workflow of the abnormality detection method of the engine of the present application is described in detail below.
According to one embodiment of the present application, determining whether an abnormality occurs in an engine based on a maximum cylinder pressure difference value includes: when the target stroke is a compression stroke, determining whether the current cylinder is abnormal or not based on a maximum cylinder pressure difference value corresponding to the compression stroke; and when the target stroke is the power stroke, determining whether the fuel injector corresponding to the current cylinder is abnormal or not based on the maximum cylinder pressure difference value corresponding to the power stroke.
Specifically, when determining whether an abnormality occurs in the engine based on the maximum cylinder pressure difference value, it may be classified into the following two cases: when the target stroke is the compression stroke, the state of the cylinder can be effectively detected by detecting the maximum cylinder pressure value under the compression stroke, namely, the maximum cylinder pressure value under the compression stroke of the current cylinder and the maximum cylinder pressure value under the compression stroke of the previous cylinder can be obtained according to the maximum cylinder pressure value under the compression stroke, the difference value between the maximum cylinder pressure value and the maximum cylinder pressure value is calculated, whether the current cylinder is abnormal or not can be determined according to the maximum cylinder pressure value, for example, the maximum cylinder pressure difference value is compared with a preset value, when the preset value is exceeded, the current cylinder is determined to be abnormal, and when the preset value is not exceeded, the current cylinder is determined to be abnormal.
Under the condition that the target stroke is the power stroke, the fuel injector can perform fuel injection, in the process, the working state of the fuel injector of the engine can be effectively detected by detecting the maximum cylinder pressure value under the power stroke, namely, the maximum cylinder pressure value of the current cylinder under the power stroke and the maximum cylinder pressure value of the previous cylinder under the power stroke can be obtained according to the maximum cylinder pressure value and the maximum cylinder pressure value of the previous cylinder, the difference value between the maximum cylinder pressure value and the maximum cylinder pressure value is calculated, whether the fuel injector corresponding to the current cylinder is abnormal or not can be determined according to the maximum cylinder pressure value, for example, the maximum cylinder pressure difference value is compared with a preset value, when the preset value is exceeded, the fuel injector corresponding to the current cylinder is determined to be abnormal, and when the preset value is not exceeded, the fuel injector corresponding to the current cylinder is determined to be abnormal.
According to one embodiment of the present application, determining whether an abnormality occurs in a current cylinder based on a maximum cylinder pressure difference value corresponding to a compression stroke includes: and when the maximum cylinder pressure difference value corresponding to the compression stroke is larger than a first cylinder pressure threshold value, determining that the current cylinder is abnormal, wherein the first cylinder pressure threshold value is determined based on the oil injection quantity corresponding to the working cycle of the current cylinder in the compression stroke.
Specifically, when determining whether the current cylinder is abnormal according to the maximum cylinder pressure difference value corresponding to the compression stroke, the maximum cylinder pressure difference value corresponding to the compression stroke may be compared with the first cylinder pressure threshold value first, when the maximum cylinder pressure difference value corresponding to the compression stroke is greater than the first cylinder pressure threshold value, the current cylinder may be determined to be abnormal, and when the maximum cylinder pressure difference value corresponding to the compression stroke is less than or equal to the first cylinder pressure threshold value, the current cylinder may be determined to be not abnormal, and the engine may be operated normally. When the first cylinder pressure threshold is determined, the first cylinder pressure threshold may be determined according to the fuel injection amount corresponding to the working cycle of the current cylinder in the compression stroke, that is, the fuel injection amount sprayed by the fuel injector in the power stroke, for example, the first cylinder pressure threshold may be obtained in a preset relation table, where the first cylinder pressure threshold and the fuel injection amount in the preset relation table are in a one-to-one correspondence, that is, after the fuel injection amount is determined, the corresponding first cylinder pressure threshold may be determined.
Further, according to an embodiment of the present application, after determining that the abnormality occurs in the current cylinder, the method further includes: if the maximum cylinder pressure difference value corresponding to the compression stroke is smaller than the second cylinder pressure threshold value, sending out cylinder abnormality reminding information; wherein the second cylinder pressure threshold is greater than the first cylinder pressure threshold; if the maximum cylinder pressure difference value corresponding to the compression stroke is greater than or equal to the second cylinder pressure threshold value, determining that the current cylinder fails, and sending out cylinder failure reminding information.
Specifically, after determining that the current cylinder is abnormal, that is, when the maximum cylinder pressure difference value corresponding to the compression stroke is greater than the first cylinder pressure threshold value, the maximum cylinder pressure difference value corresponding to the compression stroke is also required to be compared with the second cylinder pressure threshold value, so that the degree of the failure of the cylinder can be further determined. For example, when the maximum cylinder pressure difference value corresponding to the compression stroke is smaller than the second cylinder pressure threshold value, a cylinder abnormality reminding message can be sent out to remind drivers of abnormal cylinder work, and the drivers and passengers can go to a service station to overhaul the engine as soon as possible; when the maximum cylinder pressure difference value corresponding to the compression stroke is greater than or equal to the second cylinder pressure threshold value, the current cylinder can be determined to be faulty, the cylinder cannot work stably, such as the current cylinder is in fire, and cylinder operation faults, and air cylinder fault reminding information is sent out to remind drivers and passengers of working faults in the engine cylinder, and the vehicle should stop for inspection as soon as possible, so that major faults are avoided.
The second cylinder pressure threshold value is larger than the first cylinder pressure threshold value, and is obtainable through a large number of engine mount tests and whole vehicle tests, and stored in the ECU.
According to one embodiment of the present application, determining whether an abnormality occurs in an injector corresponding to a current cylinder based on a maximum cylinder differential pressure value corresponding to a power stroke includes: and when the maximum cylinder pressure difference value corresponding to the power stroke is larger than a third cylinder pressure threshold value, determining that the fuel injector corresponding to the current cylinder is abnormal, wherein the third cylinder pressure threshold value is determined based on the fuel injection quantity corresponding to the working cycle of the current cylinder in the power stroke.
Specifically, when determining whether the injector corresponding to the current cylinder is abnormal according to the maximum cylinder pressure difference value corresponding to the power stroke, firstly, comparing the maximum cylinder pressure difference value corresponding to the power stroke with a third cylinder pressure threshold, when the maximum cylinder pressure difference value corresponding to the power stroke is larger than the third cylinder pressure threshold, determining that the injector corresponding to the current cylinder is abnormal, if the fuel injection quantity of the injector is abnormal, and when the maximum cylinder pressure difference value corresponding to the power stroke is smaller than or equal to the third cylinder pressure threshold, determining that the injector corresponding to the current cylinder is not abnormal, and the fuel injection quantity of the injector is normal. It should be noted that, when the third cylinder pressure threshold is determined, the third cylinder pressure threshold may be determined according to the fuel injection amount of the current cylinder in the power stroke, that is, the fuel injection amount corresponding to the working cycle of the current cylinder in the power stroke, for example, the third cylinder pressure threshold may be obtained in a preset relation table, where the third cylinder pressure threshold and the fuel injection amount in the preset relation table are in a one-to-one correspondence, that is, after the fuel injection amount is determined, the corresponding third cylinder pressure threshold may be determined.
According to one embodiment of the present application, after determining that the injector corresponding to the current cylinder is abnormal, the method further includes: if the maximum cylinder pressure difference value corresponding to the power stroke is smaller than a fourth cylinder pressure threshold value, sending out abnormal reminding information of the fuel injector, wherein the fourth cylinder pressure threshold value is larger than the third cylinder pressure threshold value; if the maximum cylinder pressure difference value corresponding to the power stroke is greater than or equal to the fourth cylinder pressure threshold value, determining that the fuel injector corresponding to the current cylinder fails, and sending fuel injector failure reminding information and/or increasing the fuel injection quantity of a normal fuel injector.
Specifically, after it is determined that the injector corresponding to the current cylinder is abnormal, that is, when the maximum cylinder pressure difference value corresponding to the power stroke is greater than the third cylinder pressure threshold value, the maximum cylinder pressure difference value corresponding to the power stroke is also required to be compared with the fourth cylinder pressure threshold value, so that the fault degree of the injector can be further determined. For example, when the maximum cylinder pressure difference value corresponding to the power stroke is smaller than the fourth cylinder pressure threshold value, the abnormal reminding information of the oil sprayer can be sent out to remind drivers and passengers that the oil sprayer works abnormally, and the drivers and passengers can go to a service station to overhaul the engine as soon as possible; when the maximum cylinder pressure difference value corresponding to the power stroke is greater than or equal to the fourth cylinder pressure threshold value, the fault of the fuel injector corresponding to the current cylinder can be determined, the cylinder cannot work stably, such as the cylinder operation fault of the current cylinder in case of fire and the like, and fuel injector fault reminding information is sent out to remind drivers and passengers of the fuel injector operation fault corresponding to the engine cylinder, and the fuel injector is stopped and checked as soon as possible, so that major faults are avoided.
Or when the maximum cylinder pressure difference value corresponding to the power stroke is greater than or equal to the fourth cylinder pressure threshold value, it can be determined that the fuel injector corresponding to the current cylinder fails, and the cylinder cannot work stably, for example, the current cylinder is in fire, and the like, at the moment, an emergency strategy can be started, for example, by increasing the fuel injection quantity of a normal fuel injector, for example, a 4-cylinder engine is taken as an example, after the fuel injector corresponding to the current 1 cylinder fails, the fuel injection quantity of the other 3 cylinders can be properly increased to maintain the power output of the engine, and vehicle accidents caused by insufficient power, flameout and the like of the vehicle are avoided.
Or when the maximum cylinder pressure difference value corresponding to the power stroke is greater than or equal to the fourth cylinder pressure threshold value, the fault of the fuel injector corresponding to the current cylinder can be determined, the cylinder cannot work stably, such as the cylinder operation fault of the current cylinder caused by fire and the like, and fuel injector fault reminding information is sent out, a driver is reminded of the fuel injector corresponding to the engine cylinder to work fault, the check is stopped as soon as possible, serious faults are avoided, and when the current cylinder cannot work stably, the fuel injection quantity of the normal fuel injector can be increased, for example, after the fuel injector corresponding to the current cylinder 1 fails, the fuel injection quantity of the rest 3 cylinders can be increased appropriately to maintain the power output of the engine, and vehicle accidents caused by insufficient power, flameout and the like of a vehicle are avoided.
According to an embodiment of the present application, the abnormality detection method of an engine further includes: acquiring oil injection quantity of a current cylinder and a previous cylinder in a power stroke; and under the condition that the oil injection quantity of the current cylinder and the previous cylinder in the power stroke is the same, determining whether the oil injector corresponding to the current cylinder is abnormal or not based on the maximum cylinder pressure difference value corresponding to the power stroke.
Specifically, except that the vehicle runs at acceleration and deceleration, the fuel injection quantity of the current cylinder and the previous cylinder in the power stroke of the vehicle is equal in a constant-speed running state, and the power is equal only when the fuel injection quantity is equal, so that the judgment of the pressure value is performed when the power is equal. For example, the fuel injection quantity of the current cylinder and the previous cylinder in the power stroke is obtained, after the fuel injection quantity is obtained, the fuel injection quantity of the current cylinder in the power stroke is compared with the fuel injection quantity of the previous cylinder in the power stroke, if the fuel injection quantity is the same, whether the fuel injector corresponding to the current cylinder is abnormal or not can be determined according to the maximum cylinder pressure difference value corresponding to the power stroke, and if the fuel injector corresponding to the current cylinder is abnormal, the fuel injector corresponding to the current cylinder is not determined according to the maximum cylinder pressure difference value corresponding to the power stroke, otherwise, the fuel injector corresponding to the current cylinder is not abnormal.
In summary, the application can monitor the running condition of the engine cylinder in real time, and give an alarm when the cylinder works abnormally or the oil injector sprays abnormally, so as to remind drivers to overhaul the engine as soon as possible, when single-cylinder or multi-cylinder operation faults occur, the alarm can be given out and fault early warning can be carried out so as to remind drivers of the working faults and the oil injector faults in the engine cylinder, and meanwhile, different emergency oil injection strategies are formulated, so that the vehicle is prevented from losing power or flameout, the safety problem caused by the lack of power in the running process of the vehicle is avoided, the occurrence probability of serious faults can be reduced, the safety of drivers and passengers is ensured, and the maintenance cost is reduced.
As a specific example, as shown in fig. 4, the abnormality (engine cylinder abnormality) detection method of the engine of the present application may include the steps of:
s101, the vehicle runs, and a plurality of cylinders of the engine work circularly according to a preset sequence.
S102, obtaining a difference value between the maximum cylinder pressure of the current cylinder in the compression stroke and the maximum cylinder pressure of the previous cylinder in the compression stroke, and obtaining a maximum cylinder pressure difference value.
S103, judging whether the maximum cylinder pressure difference value is larger than a first cylinder pressure threshold value. If yes, go to step S104; if not, step S101 is performed. The first cylinder pressure threshold value is determined based on the oil injection quantity corresponding to the working cycle of the current cylinder in the compression stroke.
S104, judging whether the maximum cylinder pressure difference value is larger than a second cylinder pressure threshold value. If yes, step S105 is performed; if not, step S106 is performed. Wherein the second cylinder pressure threshold is greater than the first cylinder pressure threshold.
S105, determining that the current cylinder fails, and sending out cylinder failure reminding information.
S106, sending out abnormal reminding information of the air cylinder.
As a specific example, as shown in fig. 5, the abnormality (injector abnormality corresponding to an engine cylinder) detection method of the engine of the present application may include the steps of:
s201, the vehicle runs, and a plurality of cylinders of the engine are cyclically operated in a preset sequence.
S202, obtaining a difference value between the maximum cylinder pressure of the current cylinder in the power stroke and the maximum cylinder pressure of the previous cylinder in the power stroke, and obtaining a maximum cylinder pressure difference value.
S203, the oil injection quantity of the current cylinder and the previous cylinder in the power stroke is obtained.
S204, judging whether the fuel injection quantity of the current cylinder and the previous cylinder in the power stroke is the same. If yes, go to step S205; if not, step S201 is performed.
S205, judging whether the maximum cylinder pressure difference value is larger than a third cylinder pressure threshold value. If yes, go to step S206; if not, step S201 is performed.
S206, judging whether the maximum cylinder pressure difference value is larger than a fourth cylinder pressure threshold value. If yes, go to step S207; if not, step S209 is performed.
S207, determining that the fuel injector corresponding to the current cylinder fails, and sending out fuel injector failure reminding information.
S208, the fuel injection quantity of the normal fuel injector is increased.
S209, sending out abnormal reminding information of the fuel injector.
In summary, according to the method for detecting an abnormality of an engine according to the embodiment of the present application, firstly, in a process in which a plurality of cylinders of the engine circularly work according to a preset sequence, a difference value between a maximum cylinder pressure of a current cylinder in a target stroke and a maximum cylinder pressure of a previous cylinder in the target stroke is obtained, a maximum cylinder pressure difference value is obtained, and then, whether the engine is abnormal or not is determined based on the maximum cylinder pressure difference value. Therefore, the method can monitor the running condition of the engine in real time, discover problems in time, reduce the occurrence probability of major faults and ensure the safety of drivers and passengers.
Corresponding to the embodiment, the application further provides an abnormality detection device of the engine.
As shown in fig. 6, an abnormality detection device 100 of an engine according to an embodiment of the present application includes: an acquisition module 110 and a determination module 120.
The receiving module 110 is configured to obtain, during a cycle operation of a plurality of cylinders of the engine according to a preset sequence, a difference between a maximum cylinder pressure of a current cylinder in a target stroke and a maximum cylinder pressure of a previous cylinder in the target stroke, so as to obtain a maximum cylinder pressure difference value. The determination module 120 is operable to determine whether an engine abnormality has occurred based on the maximum cylinder differential pressure value.
According to one embodiment of the application, the determination module 120 determines whether an engine anomaly has occurred based on a maximum cylinder differential pressure value, specifically for: when the target stroke is a compression stroke, determining whether the current cylinder is abnormal or not based on a maximum cylinder pressure difference value corresponding to the compression stroke; and when the target stroke is the power stroke, determining whether the fuel injector corresponding to the current cylinder is abnormal or not based on the maximum cylinder pressure difference value corresponding to the power stroke.
According to one embodiment of the application, the determination module 120 determines whether an abnormality has occurred in the current cylinder based on the maximum cylinder pressure difference value corresponding to the compression stroke, specifically: and when the maximum cylinder pressure difference value corresponding to the compression stroke is larger than a first cylinder pressure threshold value, determining that the current cylinder is abnormal, wherein the first cylinder pressure threshold value is determined based on the oil injection quantity corresponding to the working cycle of the current cylinder in the compression stroke.
According to one embodiment of the application, the determining module 120 is further configured to: after determining that the current cylinder is abnormal, if the maximum cylinder pressure difference value corresponding to the compression stroke is smaller than the second cylinder pressure threshold value, sending out cylinder abnormality reminding information; wherein the second cylinder pressure threshold is greater than the first cylinder pressure threshold; if the maximum cylinder pressure difference value corresponding to the compression stroke is greater than or equal to the second cylinder pressure threshold value, determining that the current cylinder fails, and sending out cylinder failure reminding information.
According to one embodiment of the application, the determination module 120 determines whether an abnormality occurs in the injector corresponding to the current cylinder based on the maximum cylinder pressure difference value corresponding to the power stroke, specifically for: and when the maximum cylinder pressure difference value corresponding to the power stroke is larger than a third cylinder pressure threshold value, determining that the fuel injector corresponding to the current cylinder is abnormal, wherein the third cylinder pressure threshold value is determined based on the fuel injection quantity corresponding to the working cycle of the current cylinder in the power stroke.
According to one embodiment of the present application, the determining module 120 is specifically configured to, when determining that an abnormality occurs in the injector corresponding to the current cylinder: if the maximum cylinder pressure difference value corresponding to the power stroke is smaller than a fourth cylinder pressure threshold value, sending out abnormal reminding information of the fuel injector, wherein the fourth cylinder pressure threshold value is larger than the third cylinder pressure threshold value; if the maximum cylinder pressure difference value corresponding to the power stroke is greater than or equal to the fourth cylinder pressure threshold value, determining that the fuel injector corresponding to the current cylinder fails, and sending fuel injector failure reminding information and/or increasing the fuel injection quantity of a normal fuel injector.
According to one embodiment of the application, the acquisition module 110 is further configured to: acquiring oil injection quantity of a current cylinder and a previous cylinder in a power stroke; and under the condition that the oil injection quantity of the current cylinder and the previous cylinder in the power stroke is the same, determining whether the oil injector corresponding to the current cylinder is abnormal or not based on the maximum cylinder pressure difference value corresponding to the power stroke.
It should be noted that, for details not disclosed in the abnormality detection device of the engine according to the embodiment of the present application, please refer to details disclosed in the abnormality detection method of the engine according to the embodiment of the present application, and details thereof are not described herein.
According to the abnormality detection device of the engine, the acquisition module is used for acquiring the difference value between the maximum cylinder pressure of the current cylinder in the target stroke and the maximum cylinder pressure of the previous cylinder in the target stroke in the process that a plurality of cylinders of the engine circularly work according to the preset sequence, so as to obtain the maximum cylinder pressure difference value, and the determination module is used for determining whether the engine is abnormal or not based on the maximum cylinder pressure difference value. Therefore, the device can monitor the running condition of the engine in real time, discover problems in time, reduce the occurrence probability of major faults and ensure the safety of drivers and passengers.
Corresponding to the embodiment, the application also provides a vehicle.
As shown in fig. 7, a vehicle 200 of an embodiment of the application may include: the processor 220 and the memory 210 are configured to execute the program stored in the memory 210 and executable on the processor 220, and the processor 220 executes the program to implement the engine abnormality detection method described above.
According to the vehicle provided by the embodiment of the application, the running condition of the engine can be monitored in real time by executing the abnormality detection method of the engine, so that problems can be found in time, the occurrence probability of major faults is reduced, and the safety of drivers and passengers is ensured.
The present application also proposes a computer-readable storage medium corresponding to the above-described embodiments.
The computer-readable storage medium of the embodiment of the present application has a computer program stored thereon, which when executed implements the above-described abnormality detection method of an engine.
According to the computer readable storage medium, the engine running condition can be monitored in real time by executing the abnormality detection method of the engine, problems can be found in time, the occurrence probability of major faults is reduced, and the safety of drivers and passengers is ensured.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (10)

1. An abnormality detection method of an engine, the engine including a plurality of cylinders each having a plurality of strokes, and a fuel injector provided for each cylinder, the method comprising:
in the process that a plurality of cylinders of the engine circularly work according to a preset sequence, obtaining a difference value between the maximum cylinder pressure of the current cylinder in a target stroke and the maximum cylinder pressure of the previous cylinder in the target stroke, and obtaining a maximum cylinder pressure difference value;
determining whether an abnormality occurs in the engine based on the maximum cylinder pressure difference value.
2. The method of claim 1, wherein the determining whether an abnormality occurs to the engine based on the maximum cylinder pressure difference value comprises:
when the target stroke is a compression stroke, determining whether the current cylinder is abnormal or not based on a maximum cylinder pressure difference value corresponding to the compression stroke;
and when the target stroke is a power stroke, determining whether the fuel injector corresponding to the current cylinder is abnormal or not based on the maximum cylinder pressure difference value corresponding to the power stroke.
3. The method of claim 2, wherein the determining whether the current cylinder is abnormal based on the maximum cylinder pressure difference value corresponding to the compression stroke comprises:
and when the maximum cylinder pressure difference value corresponding to the compression stroke is larger than a first cylinder pressure threshold value, determining that the current cylinder is abnormal, wherein the first cylinder pressure threshold value is determined based on the oil injection quantity corresponding to the working cycle of the current cylinder in the compression stroke.
4. A method according to claim 3, wherein after determining that an abnormality has occurred in the current cylinder, the method further comprises:
if the maximum cylinder pressure difference value corresponding to the compression stroke is smaller than the second cylinder pressure threshold value, sending out cylinder abnormality reminding information; wherein the second cylinder pressure threshold is greater than the first cylinder pressure threshold;
and if the maximum cylinder pressure difference value corresponding to the compression stroke is greater than or equal to the second cylinder pressure threshold value, determining that the current cylinder fails, and sending out cylinder failure reminding information.
5. The method of claim 2, wherein the determining whether an abnormality occurs in the injector corresponding to the current cylinder based on the maximum cylinder pressure difference value corresponding to the power stroke comprises:
and when the maximum cylinder pressure difference value corresponding to the power stroke is larger than a third cylinder pressure threshold value, determining that the fuel injector corresponding to the current cylinder is abnormal, wherein the third cylinder pressure threshold value is determined based on the fuel injection quantity corresponding to the working cycle of the current cylinder in the power stroke.
6. The method of claim 5, wherein after determining that an abnormality occurs in the injector corresponding to the current cylinder, the method further comprises:
if the maximum cylinder pressure difference value corresponding to the power stroke is smaller than a fourth cylinder pressure threshold value, sending out abnormal reminding information of the fuel injector, wherein the fourth cylinder pressure threshold value is larger than the third cylinder pressure threshold value;
and if the maximum cylinder pressure difference value corresponding to the power stroke is greater than or equal to the fourth cylinder pressure threshold value, determining that the fuel injector corresponding to the current cylinder fails, and sending fuel injector failure reminding information and/or increasing the fuel injection quantity of a normal fuel injector.
7. The method according to claim 2, wherein the method further comprises:
acquiring oil injection quantity of the current cylinder and the previous cylinder in a power stroke;
and under the condition that the oil injection quantity of the current cylinder and the oil injection quantity of the previous cylinder in the power stroke are the same, determining whether the oil injector corresponding to the current cylinder is abnormal or not based on the maximum cylinder pressure difference value corresponding to the power stroke.
8. An abnormality detection apparatus of an engine, the engine including a plurality of cylinders each having a plurality of strokes, and a fuel injector provided for each cylinder, the apparatus comprising:
the acquisition module is used for acquiring the difference value between the maximum cylinder pressure of the current cylinder in a target stroke and the maximum cylinder pressure of the previous cylinder in the target stroke in the process that a plurality of cylinders of the engine circularly work according to a preset sequence to obtain a maximum cylinder pressure difference value;
a determination module for determining whether an abnormality occurs in the engine based on the maximum cylinder pressure difference value.
9. A vehicle, characterized in that the vehicle comprises: a memory, a processor, and a program stored on the memory and executable on the processor, the processor implementing the abnormality detection method of an engine according to any one of claims 1 to 7 when the program is executed.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed, implements the abnormality detection method of an engine according to any one of claims 1 to 7.
CN202310677413.2A 2023-06-08 2023-06-08 Abnormality detection method and device for engine, vehicle and storage medium Pending CN116641793A (en)

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CN202310677413.2A CN116641793A (en) 2023-06-08 2023-06-08 Abnormality detection method and device for engine, vehicle and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310677413.2A CN116641793A (en) 2023-06-08 2023-06-08 Abnormality detection method and device for engine, vehicle and storage medium

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CN116641793A true CN116641793A (en) 2023-08-25

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