CN115992786A - Cylinder, oil sprayer fault detection method and device, vehicle and medium - Google Patents
Cylinder, oil sprayer fault detection method and device, vehicle and medium Download PDFInfo
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Abstract
The application provides a cylinder, a fault detection method and device for an oil injector, a vehicle and a medium, wherein the method comprises the following steps: acquiring an engine rotating speed signal, a crankshaft position signal and a piston stroke, wherein the piston stroke is the distance from the top dead center to the bottom dead center of each cylinder piston of the engine; acquiring a first piston movement time and a second piston movement time according to the engine speed signal and the crankshaft position signal; calculating a first instantaneous speed and a second instantaneous speed according to the piston stroke, the first piston movement time and the second piston movement time; and determining that at least one cylinder or at least one fuel injector fails in response to the quantitative relationship between the first instantaneous speed and the second instantaneous speed does not meet a preset condition. Therefore, the operation conditions of the engine cylinder and the fuel injector can be monitored in real time by detecting the instantaneous speed of the piston of the engine cylinder, so that whether the cylinder and the fuel injector have faults or not can be judged, the vehicle configuration does not need to be refitted or increased, and the cost is low.
Description
Technical Field
The application relates to the technical field of engine systems, in particular to a method and a device for detecting faults of a cylinder and an oil sprayer, a vehicle and a medium.
Background
The engine works by requiring the normal oil injection of the oil injector, so that the cylinder works normally. If the fuel injector is stuck, blocked or otherwise malfunctions, the engine can work abnormally in a single cylinder or multiple cylinders, and even the engine can be 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 the fault of the fuel injector, the verification test of the fuel injector and the cylinder needs to be carried out in the development process. The working state of the engine, such as cylinder pressure monitoring, piston air leakage monitoring and the like, is judged by monitoring the running condition of each cylinder of the engine, and meanwhile, the working state is used for establishing an experimental database so as to evaluate the design quality of the fuel injector and the cylinder and the reliability of the engine. However, in the actual detection process of cylinder pressure monitoring and piston air leakage monitoring, vehicle configuration needs to be added, and the database is built more complicated, so that the method is high in cost.
Therefore, how to provide a method and a device for detecting faults of a cylinder and an injector with low cost is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the foregoing, embodiments of the present application provide a method and apparatus for detecting faults of a cylinder and a fuel injector, which aims to detect faults of a cylinder and a fuel injector of an engine at low cost.
In a first aspect, an embodiment of the present application provides a method for detecting faults of a cylinder and an injector, including:
acquiring an engine rotating speed signal, a crankshaft position signal and a piston stroke, wherein the piston stroke is the distance from the top dead center to the bottom dead center of each cylinder piston of the engine;
acquiring a first piston movement time and a second piston movement time according to the engine rotating speed signal and the crankshaft position signal, wherein the first piston movement time is a piston movement time corresponding to a first power stroke, the second piston movement time is a piston movement time corresponding to a second power stroke, and the second power stroke is a stroke of the last power of the first power stroke;
calculating a first instantaneous speed and a second instantaneous speed according to the piston stroke, the first piston movement time and the second piston movement time;
and determining at least one cylinder or at least one fuel injector to be failed in response to the number relation between the first instantaneous speed and the second instantaneous speed not meeting a preset condition, wherein the fuel injector corresponds to the cylinder.
Optionally, the acquiring the first piston movement time and the second piston movement time according to the engine speed signal and the crankshaft position signal includes:
acquiring a first rotation speed signal, wherein the first rotation speed signal is determined according to the crankshaft position signal, the first rotation speed signal is an engine rotation speed signal when a crankshaft rotates by a first preset angle, and the first preset angle is the rotation angle of the crankshaft in the first power stroke;
acquiring the first piston movement time according to the first rotation speed signal and a first preset angle;
acquiring a second rotating speed signal, wherein the second rotating speed signal is determined according to the crankshaft position signal, the second rotating speed signal is an engine rotating speed signal when the crankshaft rotates by a second preset angle, and the second preset angle is the rotating angle of the crankshaft of the second power stroke;
and acquiring the second piston movement time according to the second rotating speed signal and a second preset angle.
Optionally, the calculating the first instantaneous speed and the second instantaneous speed according to the piston stroke, the first piston movement time and the second piston movement time includes:
calculating the first instantaneous speed based on the piston stroke and the first piston movement time;
and calculating the second instantaneous speed according to the piston stroke and the second piston movement time.
Optionally, the determining, in response to the number relationship between the first instantaneous speed and the second instantaneous speed not meeting a preset condition, the at least one cylinder or the at least one injector to fail includes:
and determining that the cylinder or the fuel injector corresponding to the second power stroke is failed in response to the difference between the second instantaneous speed and the first instantaneous speed exceeding a preset range.
Optionally, after said determining that at least one cylinder or at least one injector is malfunctioning, the method further comprises:
outputting an overhaul reminder in response to the absolute value of the difference between the second instantaneous speed and the first instantaneous speed not exceeding a preset threshold;
and outputting a parking check reminder in response to the absolute value of the difference between the second instantaneous speed and the first instantaneous speed exceeding the preset threshold.
Optionally, after said determining that at least one cylinder or at least one injector is malfunctioning, the method further comprises:
and adjusting the oil injection quantity of at least one oil injector according to the quantity relation between the first instantaneous speed and the second instantaneous speed.
Optionally, the method further comprises:
acquiring first oil injection time and second oil injection time, wherein the first oil injection time is the oil injection time of the first power stroke oil injector, and the second oil injection time is the oil injection time of the second power stroke oil injector;
verifying the first preset angle by using the first oil injection time;
and verifying the second preset angle by using the second oil injection time.
In a second aspect, an embodiment of the present application provides a cylinder and injector fault detection device, including:
the first acquisition module is used for acquiring an engine rotating speed signal, a crankshaft position signal and a piston stroke, wherein the piston stroke is the distance from the top dead center to the bottom dead center of each cylinder piston of the engine;
the second acquisition module is used for acquiring first piston movement time and second piston movement time according to the engine rotating speed signal and the crankshaft position signal, wherein the first piston movement time is corresponding to a first power stroke, the second piston movement time is corresponding to a second power stroke, and the second power stroke is a later power stroke of the first power stroke;
the calculating module is used for calculating a first instantaneous speed and a second instantaneous speed according to the piston stroke, the first piston movement time and the second piston movement time;
and the fault determining module is used for determining that at least one cylinder or at least one fuel injector is in fault in response to the number relation between the first instantaneous speed and the second instantaneous speed does not meet a preset condition, and the fuel injector corresponds to the cylinder.
In a third aspect, embodiments of the present application provide a vehicle including a controller and an engine including a cylinder, a fuel injector, a piston, a crankshaft position sensor, and a rotational speed sensor;
the cylinder, the oil sprayer, the piston, the crankshaft and the crankshaft position sensor are sequentially connected;
the fuel injector, the rotating speed sensor and the crankshaft position sensor are respectively connected with the controller;
the rotating speed sensor is used for acquiring an engine rotating speed signal;
the crankshaft position sensor is used for acquiring a crankshaft position signal;
the controller is configured to execute the cylinder and injector fault detection method according to any one of the first aspect.
In a fourth aspect, embodiments of the present application provide a computer storage medium having code stored therein, where when the code is executed, an apparatus for executing the code implements the cylinder, injector fault detection method of any one of the foregoing first aspects.
The embodiment of the application provides a cylinder and fuel injector fault detection method and device, when the method is executed, an engine rotating speed signal, a crankshaft position signal and a piston stroke are firstly obtained, wherein the piston stroke is the distance from the top dead center to the bottom dead center of each cylinder piston of an engine; obtaining a first piston movement time and a second piston movement time according to the engine rotating speed signal and the crankshaft position signal, wherein the first piston movement time is a piston movement time corresponding to a first power stroke, the second piston movement time is a piston movement time corresponding to a second power stroke, and the second power stroke is a stroke of the last power of the first power stroke; then, calculating a first instantaneous speed and a second instantaneous speed according to the piston stroke, the first piston movement time and the second piston movement time; and finally, determining at least one cylinder or at least one fuel injector to be failed in response to the number relation between the first instantaneous speed and the second instantaneous speed not meeting a preset condition, wherein the fuel injector corresponds to the cylinder.
Therefore, the operation conditions of the engine cylinder and the fuel injector can be monitored in real time by detecting the instantaneous speed of the piston of the engine cylinder, so that whether the cylinder and the fuel injector fail or not can be judged, the vehicle configuration does not need to be refitted or increased, the cost is low, the implementation is easy, and the application range is wide.
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In order to more clearly illustrate the present embodiments or the technical solutions in the prior art, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for detecting faults of a cylinder and an oil injector according to an embodiment of the present application;
FIG. 2 is a schematic diagram of work performed by a failure detection method for a cylinder and an injector according to an embodiment of the present application;
FIG. 3 is a flowchart of another method for detecting faults of a cylinder and an injector according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a fault detection device for a cylinder and an injector according to an embodiment of the present application.
Detailed Description
Whether the cylinder and the oil injector are in failure or not is an important performance index for influencing the normal operation of the engine. In the prior art, in order to prevent faults of the air cylinder and the oil injector, verification tests of the air cylinder and the oil injector are required to be carried out in the development process. The working state of the engine, such as cylinder pressure monitoring, piston air leakage monitoring and the like, is judged by monitoring the running condition of each cylinder of the engine, and meanwhile, the working state is used for establishing an experimental database so as to evaluate the design quality of the fuel injector and the cylinder and the reliability of the engine. However, in the actual detection process of cylinder pressure monitoring and piston air leakage monitoring, vehicle configuration needs to be added, and the database is built more complicated, so that the method is high in cost.
The method provided by the embodiment of the application is executed by computer equipment and is used for detecting faults of the engine cylinder and the fuel injector at low cost.
It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1, fig. 1 is a flowchart of a method for detecting faults of a cylinder and an injector according to an embodiment of the present application, including:
step S101: an engine speed signal, a crankshaft position signal, and a piston stroke are obtained.
During the running process of the vehicle, the engine continuously works, so that the rotation speed signal and the crank shaft position signal of the engine can be continuously acquired through the sensor, and the running state of the engine is acquired according to the rotation speed signal and the crank shaft position signal; meanwhile, the sensor does not need additional installation, so that a great deal of cost is saved.
The piston stroke is the distance from top dead center to bottom dead center of each cylinder piston of the engine. While the engine may be single-cylinder or multi-cylinder (e.g., 4-cylinder, 8-cylinder, etc.), the specifications of the cylinders are the same for the same engine. Thus, for the same engine, the piston stroke of each piston is the same, even though the cylinders doing work are different and the pistons that move are different. Therefore, the piston strokes of different pistons do not need to be repeatedly acquired, and unnecessary memory consumption is reduced.
Step S102: and acquiring a first piston movement time and a second piston movement time according to the engine rotating speed signal and the crankshaft position signal.
The working strokes of the engine are respectively four strokes of air suction, compression, acting and exhaust. In four strokes, the power stroke is the stroke of the engine cylinder actively working to output power. Referring to fig. 2, fig. 2 is a schematic diagram of work done by the method for detecting faults of a cylinder and an injector according to an embodiment of the present application. From the figure, the power stroke, the fuel injector injects fuel, the combustion in the cylinder does work to push the piston to move downwards, the piston stroke is L, and the crankshaft rotates 180 degrees. Therefore, the running state of the power stroke piston is obtained, and whether the whole cylinder is faulty or not can be judged.
The first piston movement time is the piston movement time corresponding to the first power stroke, the second piston movement time is the piston movement time corresponding to the second power stroke, and the second power stroke is the stroke of the last power after the first power stroke.
For example, for a single cylinder engine, there is only one cylinder, one fuel injector, one piston, so both the first power stroke and the second power stroke are the strokes of this set of structures. The first piston movement time is the first power stroke piston movement time of the group of structures, and the second piston movement time is the piston movement time of the group of structures for repeating the power stroke.
In the case of a multi-cylinder engine, the multi-cylinder engine comprises a plurality of cylinders, a plurality of fuel injectors and a plurality of pistons, the above structures are correspondingly grouped, and two adjacent power strokes can be completed by structures of different groups. For example, a four-cylinder engine with a firing sequence of a fourth group of structures, a second group of structures, a third group of structures and a first group of structures is specifically disclosed, the first piston movement time is the fourth group of structures power stroke piston movement time, the second piston movement time is the second group of structures power stroke piston movement time, and the like, and the cycle is executed.
Specifically, a first rotational speed signal can be obtained first, and then the first piston movement time can be obtained according to the first rotational speed signal and a first preset angle; and then a second rotating speed signal is obtained, and the second piston movement time is obtained according to the second rotating speed signal and a second preset angle.
The first rotation speed signal is determined according to the crankshaft position signal, the first rotation speed signal is an engine rotation speed signal when the crankshaft rotates by a first preset angle, and the first preset angle is the rotation angle of the crankshaft in the first power stroke. The second rotating speed signal is determined according to the crankshaft position signal, the second rotating speed signal is an engine rotating speed signal when the crankshaft rotates by a second preset angle, and the second preset angle is the rotating angle of the crankshaft of the second power stroke.
Since the crankshaft rotates every 2 weeks (720 °) during running of the vehicle, the engine works for 1 single cylinder. Thus, crankshaft rotation is related to engine motion, i.e., to engine speed. After knowing the rotation speed of the engine, the time of one circle of rotation of the crankshaft can be obtained, then the position of the crankshaft and the rotation condition of the crankshaft are judged according to the position signal of the crankshaft, and further the stroke in which the crankshaft is positioned is determined, and if the power stroke is performed, the piston movement time is obtained according to the rotation condition of the crankshaft.
Step S103: and calculating a first instantaneous speed and a second instantaneous speed according to the piston stroke, the first piston movement time and the second piston movement time.
Based on the physical principle v=s/T, where V denotes speed, S denotes distance, and T denotes time. A first instantaneous speed may be calculated from the piston stroke and the first piston movement time; a second instantaneous speed is calculated based on the piston stroke and the second piston movement time.
Step S104: and determining that at least one cylinder or at least one fuel injector fails in response to the quantitative relationship between the first instantaneous speed and the second instantaneous speed does not meet a preset condition.
In the case of normal operation of the engine, the number relationship between the first instantaneous speed and the second instantaneous speed should satisfy a preset condition, and as a possible implementation, the preset condition may be set such that the magnitude of the difference between the two is within a preset range. The preset range can be obtained and stored in advance through a large number of engine bench tests and whole vehicle tests, and is not limited herein. And when the number relation between the first instantaneous speed and the second instantaneous speed does not meet the preset condition, determining that the oil sprayer or the air cylinder fails.
In summary, the operation conditions of the engine cylinder and the fuel injector can be monitored in real time by detecting the instantaneous speed of the piston of the engine cylinder, so that whether the cylinder and the fuel injector fail or not can be judged, the vehicle configuration does not need to be modified or increased, the cost is low, the implementation is easy, and the application range is wide.
In the embodiment of the present application, there are a plurality of possible implementations of the steps described in fig. 1, and the following descriptions are provided separately. It should be noted that the implementations presented in the following description are only exemplary and not representative of all implementations of the embodiments of the present application.
Referring to fig. 3, the flowchart of another method of detecting faults of a cylinder and an injector according to an embodiment of the present application includes:
step S301: an engine speed signal, a crankshaft position signal, and a piston stroke are obtained.
Step S302: and acquiring a first piston movement time and a second piston movement time according to the engine rotating speed signal and the crankshaft position signal.
As a possible implementation manner, a first oil injection time and a second oil injection time may be acquired, and the first preset angle is verified by using the first oil injection time; and verifying the second preset angle by using the second oil injection time. The first oil injection time is the oil injection time of the first power stroke oil injector, and the second oil injection time is the oil injection time of the second power stroke oil injector.
Since the injection time is the time of the power stroke, the rotation of the crankshaft by the preset angle should be the rotation of the power stroke, and thus the rotation of the crankshaft by the preset angle should be the same as the injection time. And because the first preset angle and the second preset angle relate to the first rotating speed signal and the second rotating speed signal, the first rotating speed signal and the second rotating speed signal relate to the first piston movement time and the second piston movement time. Therefore, the first preset angle can be verified by using the first injection time; and verifying the second preset angle by using the second oil injection time.
Step S303: and calculating a first instantaneous speed and a second instantaneous speed according to the piston stroke, the first piston movement time and the second piston movement time.
Step S304: and determining that the cylinder or the fuel injector corresponding to the second power stroke is failed in response to the difference between the second instantaneous speed and the first instantaneous speed exceeding a preset range.
The preset range can be set according to requirements and experience. When the difference between the second instantaneous speed and the first instantaneous speed is larger than the maximum value of the preset range, the second instantaneous speed is excessively large, the oil injection quantity is excessive, and the faults of excessively high cylinder pressure or excessive oil injection of the oil injector corresponding to the second power stroke can occur; when the difference between the second instantaneous speed and the first instantaneous speed is smaller than the minimum value of the preset range, the second instantaneous speed is too small, the oil injection quantity is too small, and faults such as air leakage of the cylinder corresponding to the second power stroke or too little oil injection (clamping stagnation) of the oil injector can occur.
Step S305: and outputting a maintenance reminder in response to the absolute value of the difference between the second instantaneous speed and the first instantaneous speed not exceeding a preset threshold.
When the absolute value of the difference value between the second instantaneous speed and the first instantaneous speed does not exceed the preset threshold, the difference value between the second instantaneous speed and the first instantaneous speed only exceeds the preset range, but is not too large, at the moment, an overhaul prompt can be output, an alarm is sent to perform fault early warning, and drivers and passengers are reminded that the engine cylinder and the fuel injector work abnormally and are required to be overhauled in time.
The preset threshold may be set empirically, and is not limited herein.
Step S306: and outputting a parking check reminder in response to the absolute value of the difference between the second instantaneous speed and the first instantaneous speed exceeding the preset threshold.
When the absolute value of the difference between the second instantaneous speed and the first instantaneous speed exceeds a preset threshold, the difference between the second instantaneous speed and the first instantaneous speed exceeds a preset range, and a parking inspection prompt is output in time at the moment to remind drivers and passengers of parking inspection as soon as possible, so that major faults are avoided, and maintenance cost is reduced.
Step S307: and adjusting the oil injection quantity of at least one oil injector according to the quantity relation between the first instantaneous speed and the second instantaneous speed.
After determining that the cylinder and the oil sprayer are out of order, a corresponding emergency oil injection strategy can be formulated according to the quantity relation between the first instantaneous speed and the second instantaneous speed, the oil injection quantity of other cylinders of the engine is adjusted, the power output of the engine is stabilized, the power loss or flameout of the vehicle is avoided, the safety problem caused by the power loss in the running process of the vehicle is avoided, the safety of drivers and passengers is ensured, and the safety of the vehicle is improved.
Specifically, when the difference between the second instantaneous speed and the first instantaneous speed is greater than the maximum value, the fuel injection quantity of other cylinders can be reduced so as to reduce the cylinder pressure of the cylinders; when the difference between the second instantaneous speed and the first instantaneous speed is smaller than the minimum value, the oil injection quantity of other cylinders can be increased so as to avoid the loss of power or flameout caused by air leakage of the cylinders or too little oil injection (clamping stagnation) of the oil injector.
In summary, the embodiment can facilitate the timely overhaul of drivers and passengers by outputting the overhaul reminding, reduce the occurrence probability of major faults, reduce the maintenance cost, ensure the safety of the drivers and passengers and reduce the maintenance cost; through adjusting the oil injection quantity, the vehicle is prevented from losing power or flameout, and the safety problem caused by the power loss in the running process of the vehicle is avoided, so that the safety of drivers and passengers is ensured, and the safety of the vehicle is improved.
The embodiments of the present application provide some specific implementation manners of a fault detection method for a cylinder and an injector, and based on this, the present application further provides a corresponding device. The apparatus provided in the embodiments of the present application will be described from the viewpoint of functional modularization.
Referring to the schematic structural diagram of the cylinder and injector fault detection device shown in fig. 4, the device includes a first acquisition module 401, a second acquisition module 402, a calculation module 403, and a fault determination module 404.
A first acquisition module 401, configured to acquire an engine rotational speed signal, a crankshaft position signal, and a piston stroke, where the piston stroke is a distance from a top dead center to a bottom dead center of each cylinder piston of the engine;
a second obtaining module 402, configured to obtain a first piston movement time and a second piston movement time according to the engine rotational speed signal and the crankshaft position signal, where the first piston movement time is a piston movement time corresponding to a first power stroke, the second piston movement time is a piston movement time corresponding to a second power stroke, and the second power stroke is a stroke of a power after the first power stroke;
a calculating module 403, configured to calculate a first instantaneous speed and a second instantaneous speed according to the piston stroke, the first piston movement time and the second piston movement time;
the fault determining module 404 is configured to determine that at least one cylinder or at least one injector is faulty in response to the number relationship between the first instantaneous speed and the second instantaneous speed not meeting a preset condition, where the injector corresponds to the cylinder.
As a possible implementation manner, the second obtaining module 402 includes:
the first rotation speed acquisition unit is used for acquiring a first rotation speed signal, the first rotation speed signal is determined according to the crankshaft position signal, the first rotation speed signal is an engine rotation speed signal when the crankshaft rotates by a first preset angle, and the first preset angle is the rotation angle of the first power stroke crankshaft;
the first time acquisition unit is used for acquiring the first piston movement time according to the first rotation speed signal and a first preset angle;
the second rotating speed acquisition unit is used for acquiring a second rotating speed signal, the second rotating speed signal is determined according to the crankshaft position signal, the second rotating speed signal is an engine rotating speed signal when the crankshaft rotates by a second preset angle, and the second preset angle is the rotating angle of the second power stroke crankshaft;
and the second time acquisition unit is used for acquiring the second piston movement time according to the second rotating speed signal and a second preset angle.
As a possible implementation manner, the calculating module 403 includes:
a first calculation unit for calculating the first instantaneous speed in accordance with the piston stroke and the first piston movement time;
and a second calculating unit for calculating the second instantaneous speed according to the piston stroke and the second piston movement time.
As a possible implementation manner, the fault determining module 404 includes:
and the fault determining unit is used for determining that the cylinder or the fuel injector corresponding to the second power stroke is faulty in response to the difference value between the second instantaneous speed and the first instantaneous speed exceeding a preset range.
As a possible implementation manner, the device further comprises:
the first reminding module is used for outputting maintenance reminding in response to the absolute value of the difference value between the second instantaneous speed and the first instantaneous speed not exceeding a preset threshold;
and the second reminding module is used for outputting a parking check reminder in response to the absolute value of the difference value between the second instantaneous speed and the first instantaneous speed exceeding the preset threshold.
As a possible implementation manner, the device further comprises:
and the fuel injection adjustment module is used for adjusting the fuel injection quantity of at least one fuel injector according to the quantity relation between the first instantaneous speed and the second instantaneous speed.
As a possible implementation manner, the device further comprises:
the oil injection time acquisition module is used for acquiring first oil injection time and second oil injection time, wherein the first oil injection time is the oil injection time of the first power stroke oil injector, and the second oil injection time is the oil injection time of the second power stroke oil injector;
the first verification module is used for verifying the first preset angle by utilizing the first oil injection time;
and the second verification module is used for verifying the second preset angle by using the second oil injection time.
The embodiment of the application also provides a corresponding vehicle and a computer storage medium for realizing the scheme provided by the embodiment of the application.
Wherein the vehicle comprises a controller and an engine, the engine comprises a cylinder, an oil injector, a piston, a crankshaft position sensor and a rotation speed sensor;
the cylinder, the oil sprayer, the piston, the crankshaft and the crankshaft position sensor are sequentially connected;
the fuel injector, the rotating speed sensor and the crankshaft position sensor are respectively connected with the controller;
the rotating speed sensor is used for acquiring an engine rotating speed signal;
the crankshaft position sensor is used for acquiring a crankshaft position signal;
the controller is used for executing the fault detection method of the air cylinder and the fuel injector.
The computer storage medium stores codes, and when the codes are executed, equipment for executing the codes realizes the fault detection method of the cylinder and the fuel injector.
The "first" and "second" in the names of "first", "second" (where present) and the like in the embodiments of the present application are used for name identification only, and do not represent the first and second in sequence.
From the above description of embodiments, it will be apparent to those skilled in the art that all or part of the steps of the above described example methods may be implemented in software plus general hardware platforms. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which may be stored in a storage medium, such as a read-only memory (ROM)/RAM, a magnetic disk, an optical disk, or the like, including several instructions for causing a computer device (which may be a personal computer, a server, or a network communication device such as a router) to perform the methods described in the embodiments or some parts of the embodiments of the present application.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application.
Claims (10)
1. A method for detecting faults of a cylinder and an oil injector, which is characterized by comprising the following steps:
acquiring an engine rotating speed signal, a crankshaft position signal and a piston stroke, wherein the piston stroke is the distance from the top dead center to the bottom dead center of each cylinder piston of the engine;
acquiring a first piston movement time and a second piston movement time according to the engine rotating speed signal and the crankshaft position signal, wherein the first piston movement time is a piston movement time corresponding to a first power stroke, the second piston movement time is a piston movement time corresponding to a second power stroke, and the second power stroke is a stroke of the last power of the first power stroke;
calculating a first instantaneous speed and a second instantaneous speed according to the piston stroke, the first piston movement time and the second piston movement time;
and determining at least one cylinder or at least one fuel injector to be failed in response to the number relation between the first instantaneous speed and the second instantaneous speed not meeting a preset condition, wherein the fuel injector corresponds to the cylinder.
2. The method of claim 1, wherein the obtaining a first piston movement time and a second piston movement time from the engine speed signal and the crankshaft position signal comprises:
acquiring a first rotation speed signal, wherein the first rotation speed signal is determined according to the crankshaft position signal, the first rotation speed signal is an engine rotation speed signal when a crankshaft rotates by a first preset angle, and the first preset angle is the rotation angle of the crankshaft in the first power stroke;
acquiring the first piston movement time according to the first rotation speed signal and a first preset angle;
acquiring a second rotating speed signal, wherein the second rotating speed signal is determined according to the crankshaft position signal, the second rotating speed signal is an engine rotating speed signal when the crankshaft rotates by a second preset angle, and the second preset angle is the rotating angle of the crankshaft of the second power stroke;
and acquiring the second piston movement time according to the second rotating speed signal and a second preset angle.
3. The method of claim 2, wherein calculating the first and second instantaneous speeds from the piston stroke, the first piston movement time, and the second piston movement time comprises:
calculating the first instantaneous speed based on the piston stroke and the first piston movement time;
and calculating the second instantaneous speed according to the piston stroke and the second piston movement time.
4. The method of claim 3, wherein the determining at least one cylinder or at least one injector fault in response to the quantitative relationship of the first and second instantaneous speeds not meeting a preset condition comprises:
and determining that the cylinder or the fuel injector corresponding to the second power stroke is failed in response to the difference between the second instantaneous speed and the first instantaneous speed exceeding a preset range.
5. The method of claim 4, wherein after said determining at least one cylinder or at least one injector failure, the method further comprises:
outputting an overhaul reminder in response to the absolute value of the difference between the second instantaneous speed and the first instantaneous speed not exceeding a preset threshold;
and outputting a parking check reminder in response to the absolute value of the difference between the second instantaneous speed and the first instantaneous speed exceeding the preset threshold.
6. The method of claim 1, wherein after said determining at least one cylinder or at least one injector failure, the method further comprises:
and adjusting the oil injection quantity of at least one oil injector according to the quantity relation between the first instantaneous speed and the second instantaneous speed.
7. The method according to claim 2, wherein the method further comprises:
acquiring first oil injection time and second oil injection time, wherein the first oil injection time is the oil injection time of the first power stroke oil injector, and the second oil injection time is the oil injection time of the second power stroke oil injector;
verifying the first preset angle by using the first oil injection time;
and verifying the second preset angle by using the second oil injection time.
8. A cylinder, injector failure detection apparatus, the apparatus comprising:
the first acquisition module is used for acquiring an engine rotating speed signal, a crankshaft position signal and a piston stroke, wherein the piston stroke is the distance from the top dead center to the bottom dead center of each cylinder piston of the engine;
the second acquisition module is used for acquiring first piston movement time and second piston movement time according to the engine rotating speed signal and the crankshaft position signal, wherein the first piston movement time is corresponding to a first power stroke, the second piston movement time is corresponding to a second power stroke, and the second power stroke is a later power stroke of the first power stroke;
the calculating module is used for calculating a first instantaneous speed and a second instantaneous speed according to the piston stroke, the first piston movement time and the second piston movement time;
and the fault determining module is used for determining that at least one cylinder or at least one fuel injector is in fault in response to the number relation between the first instantaneous speed and the second instantaneous speed does not meet a preset condition, and the fuel injector corresponds to the cylinder.
9. A vehicle comprising a controller and an engine, the engine comprising a cylinder, a fuel injector, a piston, a crankshaft position sensor, and a rotational speed sensor;
the cylinder, the oil sprayer, the piston, the crankshaft and the crankshaft position sensor are sequentially connected;
the fuel injector, the rotating speed sensor and the crankshaft position sensor are respectively connected with the controller;
the rotating speed sensor is used for acquiring an engine rotating speed signal;
the crankshaft position sensor is used for acquiring a crankshaft position signal;
the controller is configured to execute the cylinder, injector failure detection method according to any one of claims 1 to 7.
10. A computer storage medium having code stored therein, which when executed, causes a computer storage device executing the code to implement the cylinder, injector fault detection method of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310159483.9A CN115992786A (en) | 2023-02-23 | 2023-02-23 | Cylinder, oil sprayer fault detection method and device, vehicle and medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310159483.9A CN115992786A (en) | 2023-02-23 | 2023-02-23 | Cylinder, oil sprayer fault detection method and device, vehicle and medium |
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| Publication Number | Publication Date |
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| CN115992786A true CN115992786A (en) | 2023-04-21 |
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| CN202310159483.9A Pending CN115992786A (en) | 2023-02-23 | 2023-02-23 | Cylinder, oil sprayer fault detection method and device, vehicle and medium |
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| Country | Link |
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| CN (1) | CN115992786A (en) |
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