Method, device and equipment for detecting valve clearance

Abstract

The application discloses a valve clearance detection method, device and equipment, to solve the problem of complicated valve clearance detection process, long time consumption and low efficiency in the related art. First, in response to a detection start signal, the engine speed is controlled to reach a preset rated speed, the engine cylinder is controlled to perform in-cylinder braking, then the falling time of the engine from the preset rated speed to the preset idle speed is determined when each cylinder performs in-cylinder braking, and based on the falling time corresponding to each cylinder, the correlation value of the engine speed falling speed corresponding to each cylinder is determined, finally, the correlation value of the engine speed falling speed corresponding to each cylinder is compared with a plurality of preset correlation value intervals, and the valve clearance state of each cylinder is determined based on the comparison result. The embodiment of the application realizes the detection of the valve clearance without disassembling the engine, reduces the workload, and improves the work efficiency.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and in particular to methods, apparatus and equipment for detecting valve clearance. Background Technology

[0002] Currently, checking valve clearance requires disassembling the engine and using feeler gauges to check the valve clearance of each cylinder individually. This process is cumbersome, time-consuming, and inefficient. Summary of the Invention

[0003] The purpose of this application is to provide a method, apparatus, and equipment for detecting valve clearance, so as to solve the problems that the valve clearance detection process in related technologies is cumbersome, time-consuming, and inefficient.

[0004] In a first aspect, this application provides a method for detecting valve clearance, the method comprising:

[0005] In response to the detection start signal, after the engine speed is controlled to reach the preset rated speed, the engine cylinder is controlled to perform in-cylinder braking.

[0006] Determine the time it takes for the engine to drop from a preset rated speed to a preset idle speed when each cylinder performs in-cylinder braking;

[0007] Based on the fall-off time corresponding to each cylinder, the correlation value of the engine speed fall-off speed corresponding to each cylinder is determined, wherein the correlation value of the engine speed fall-off speed characterizes the difference in braking power of different cylinders of the engine.

[0008] The relevant value of the engine speed drop rate corresponding to each cylinder is compared with multiple preset relevant value ranges, and the valve clearance state of each cylinder is determined based on the comparison results.

[0009] In one possible implementation, before the controlled engine speed reaches a preset rated speed, the method further includes:

[0010] Determine that the vehicle meets the safe operating conditions;

[0011] The safe operating conditions include all of the following:

[0012] The engine is running;

[0013] The transmission is in neutral.

[0014] The vehicle is in a parked state;

[0015] The engine operating mode is the normal mode, which is the operating mode in which the throttle response speed is within a preset speed range and the torque is within a preset torque range.

[0016] In one possible implementation, the method further includes:

[0017] If it is determined that the vehicle does not meet the safety operating conditions, a warning signal is issued so that the user can make adjustments to the vehicle and reassess whether the vehicle meets the safety operating conditions.

[0018] In one possible implementation, determining the relevant value of the engine speed drop rate for each cylinder based on the drop time for each cylinder includes:

[0019] Determine the minimum fall-off time within the fall-off time corresponding to each cylinder;

[0020] The ratio of the fall-off time for each cylinder to the minimum fall-off time is determined to obtain the relevant value of the engine speed fall-off rate for each cylinder.

[0021] In one possible implementation, before comparing the correlation value of the engine speed drop rate corresponding to each cylinder with a preset range of correlation values, the method further includes:

[0022] The minimum drop-off time is determined to be within a preset time range, wherein the preset time range is the time range within which the engine drops from a preset rated speed to a preset idle speed when the valve clearance is normal.

[0023] In one possible implementation, the method further includes:

[0024] If the minimum fall-off time is greater than the maximum value of the preset time range, then the valve clearance of each cylinder of the engine is determined to be abnormal.

[0025] In one possible implementation, comparing the correlation value of the engine speed drop rate corresponding to each cylinder with a preset plurality of correlation value intervals, and determining the valve clearance state of each cylinder based on the comparison results, includes:

[0026] For any given cylinder, if the correlation value of the engine speed drop rate corresponding to that cylinder is within the first correlation value range, then the valve clearance of that cylinder is determined to be abnormal.

[0027] If the correlation value of the engine speed drop rate corresponding to any cylinder is within the second correlation value range, then it is determined that the valve clearance of the cylinder is normal.

[0028] The minimum value of the first correlation value interval is greater than the maximum value of the second correlation value interval.

[0029] Secondly, this application provides a valve clearance detection device, the device comprising:

[0030] The in-cylinder braking trigger module is configured to control the engine cylinder to perform in-cylinder braking after the engine speed reaches the preset rated speed in response to the detection start signal.

[0031] The fallback time determination module is configured to determine the fallback time of the engine from a preset rated speed to a preset idle speed when each cylinder performs in-cylinder braking;

[0032] The correlation value determination module is configured to determine the correlation value of the engine speed drop rate for each cylinder based on the drop time corresponding to each cylinder, wherein the correlation value of the engine speed drop rate characterizes the difference in braking power of different cylinders of the engine.

[0033] The valve clearance state determination module is configured to compare the relevant value of the engine speed drop rate corresponding to each cylinder with multiple preset relevant value ranges, and determine the valve clearance state of each cylinder based on the comparison results.

[0034] In one possible implementation, before the controlled engine speed reaches a preset rated speed, the in-cylinder braking trigger module is further configured to:

[0035] Determine that the vehicle meets the safe operating conditions;

[0036] The safe operating conditions include all of the following:

[0037] The engine is running;

[0038] The transmission is in neutral.

[0039] The vehicle is in a parked state;

[0040] The engine operating mode is the normal mode, which is the operating mode in which the throttle response speed is within a preset speed range and the torque is within a preset torque range.

[0041] In one possible implementation, the in-cylinder brake trigger module is further configured to:

[0042] If it is determined that the vehicle does not meet the safety operating conditions, a warning signal is issued so that the user can make adjustments to the vehicle and reassess whether the vehicle meets the safety operating conditions.

[0043] In one possible implementation, the correlation value determination module for determining the engine speed drop rate for each cylinder based on the drop time for each cylinder is configured to:

[0044] Determine the minimum fall-off time within the fall-off time corresponding to each cylinder;

[0045] The ratio of the fall-off time for each cylinder to the minimum fall-off time is determined to obtain the relevant value of the engine speed fall-off rate for each cylinder.

[0046] In one possible implementation, before comparing the relevant value of the engine speed drop rate corresponding to each cylinder with a plurality of preset relevant value ranges, the valve clearance state determination module is further configured to:

[0047] The minimum drop-off time is determined to be within a preset time range, wherein the preset time range is the time range within which the engine drops from a preset rated speed to a preset idle speed when the valve clearance is normal.

[0048] In one possible implementation, the valve clearance state determination module is further configured to:

[0049] If the minimum fall-off time is greater than the maximum value of the preset time range, then the valve clearance of each cylinder of the engine is determined to be abnormal.

[0050] In one possible implementation, the process of comparing the relevant value of the engine speed drop rate corresponding to each cylinder with a preset plurality of relevant value intervals, and determining the valve clearance state of each cylinder based on the comparison results, wherein the valve clearance state determination module is configured to:

[0051] For any given cylinder, if the correlation value of the engine speed drop rate corresponding to that cylinder is within the first correlation value range, then the valve clearance of that cylinder is determined to be abnormal.

[0052] If the correlation value of the engine speed drop rate corresponding to any cylinder is within the second correlation value range, then it is determined that the valve clearance of the cylinder is normal.

[0053] The minimum value of the first correlation value interval is greater than the maximum value of the second correlation value interval.

[0054] Thirdly, this application provides an electronic device, comprising:

[0055] Processor and memory;

[0056] The memory is used to store the processor-executable instructions;

[0057] The processor is configured to execute the instructions to implement the valve clearance detection method described in any one of the first aspects above.

[0058] Fourthly, this application provides a computer-readable storage medium that, when the instructions in the computer-readable storage medium are executed by an electronic device, enables the electronic device to perform the valve clearance detection method as described in any one of the first aspects above.

[0059] Fifthly, this application provides a computer program product, including a computer program:

[0060] When the computer program is executed by the processor, it implements the valve clearance detection method as described in any one of the first aspects above.

[0061] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0062] In this embodiment, firstly, in response to a detection start signal, the engine speed is controlled to reach a preset rated speed, and then the engine cylinders are controlled to perform in-cylinder braking. Then, the time it takes for the engine to drop from the preset rated speed to a preset idle speed during in-cylinder braking is determined for each cylinder. Based on the drop time for each cylinder, a relevant value for the engine speed drop rate for each cylinder is determined. Finally, the relevant value for the engine speed drop rate for each cylinder is compared with multiple preset relevant value ranges, and the valve clearance state of each cylinder is determined based on the comparison results. This embodiment can determine the valve clearance state of each cylinder by controlling the engine cylinders to perform in-cylinder braking and by determining the time it takes for the engine to drop from the preset rated speed to a preset idle speed during in-cylinder braking. This achieves valve clearance detection without disassembling the engine, reducing workload and improving work efficiency.

[0063] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0064] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0065] Figure 1 A schematic diagram of the overall process of the valve clearance detection method provided in the embodiments of this application;

[0066] Figure 2 A schematic flowchart of step 103 of the valve clearance detection method provided in this application embodiment;

[0067] Figure 3 A schematic flowchart of step 104 of the valve clearance detection method provided in this application embodiment;

[0068] Figure 4 A schematic diagram of the valve clearance detection device provided in the embodiments of this application;

[0069] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0070] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0071] Furthermore, in the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0072] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature, and in the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0073] The following explains the relevant terms or devices involved in the embodiments of this application:

[0074] Valve clearance: The clearance between the end of the intake and exhaust valves and the adjusting screw on the tappet (or rocker arm).

[0075] In-cylinder braking: By controlling the intake and exhaust valves, the power driving the piston is reduced, and the impulse of the piston is used to drag it back, thereby achieving braking.

[0076] In related technologies, checking valve clearance all requires disassembling the engine and using feeler gauges to check the valve clearance of multiple cylinders one by one. This process is cumbersome, time-consuming, and inefficient.

[0077] In view of this, this application provides a method, apparatus and equipment for detecting valve clearance, in order to solve the problems that the valve clearance detection process in related technologies is cumbersome, time-consuming and inefficient.

[0078] The inventive concept of this application can be summarized as follows: First, in response to a detection start signal, after controlling the engine speed to reach a preset rated speed, the engine cylinders are controlled to perform in-cylinder braking. Then, the time it takes for the engine to drop from the preset rated speed to a preset idle speed during in-cylinder braking is determined for each cylinder. Based on the drop time for each cylinder, a relevant value for the engine speed drop rate for each cylinder is determined. Finally, the relevant value for the engine speed drop rate for each cylinder is compared with multiple preset relevant value ranges, and the valve clearance state of each cylinder is determined based on the comparison results. This application's embodiment can determine the valve clearance state of each cylinder by controlling the engine cylinders to perform in-cylinder braking and by determining the time it takes for the engine to drop from the preset rated speed to a preset idle speed during in-cylinder braking. This achieves valve clearance detection without disassembling the engine, reducing workload and improving work efficiency.

[0079] After introducing the main inventive concepts of the embodiments of this application, the following is a brief description of the application scenarios to which the technical solutions of the embodiments of this application are applicable. It should be noted that the application scenarios described below are only for illustrating the embodiments of this application and are not intended to limit the scope. In specific implementation, the technical solutions provided by the embodiments of this application can be flexibly applied according to actual needs.

[0080] To facilitate understanding of the valve clearance detection method provided in the embodiments of this application, further explanation will be provided below with reference to the accompanying drawings.

[0081] In one possible implementation, this application provides a method for detecting valve clearance, the overall process of which is as follows: Figure 1 As shown, it includes the following:

[0082] In step 101, in response to the detection start signal, after the engine speed is controlled to reach the preset rated speed, the engine cylinder is controlled to perform in-cylinder braking.

[0083] It should be noted that this embodiment utilizes the principle of in-cylinder braking to detect valve clearance. The specific implementation principle is as follows (taking exhaust braking as an example): When in-cylinder braking is activated, some gas is expelled during the compression stroke, reducing engine output power. The braking power varies depending on the amount of expelled gas: theoretically, the in-cylinder braking power is maximum when all compressed gas is expelled during the compression stroke; conversely, the in-cylinder braking power is minimum when no compressed gas is expelled during the compression stroke. Different braking powers also have varying effects on the speed at which the engine speed drops freely. Therefore, this embodiment can determine whether there is a problem with the valve clearance based on the time it takes for the engine to drop from its rated speed to a preset idle speed.

[0084] In one possible implementation, after receiving the detection start signal, the engine ECU (Electronic Control Unit) needs to determine whether the vehicle meets safe operating conditions before controlling the engine speed to reach the preset rated speed. These safe operating conditions include the following four conditions:

[0085] 1. The engine is running;

[0086] 2. The transmission is in neutral;

[0087] 3. The vehicle is in a parked state;

[0088] 4. The engine operating mode is set to Normal mode, which means that the throttle response speed and torque are within the preset speed and torque ranges. Engine operating modes may have different names in different vehicles, such as Eco mode, Comfort mode, and Performance mode. Comfort mode is the same as Normal mode, in which the throttle response speed and torque are within the preset speed and torque ranges.

[0089] It should be noted that when all four safety conditions mentioned above are met, the embodiments of this application will determine that the vehicle meets the safety conditions.

[0090] In another possible implementation, if it is determined that the vehicle does not meet the safe operating conditions, a warning signal is issued so that the user can make adjustments to the vehicle and reassess whether the vehicle meets the safe operating conditions.

[0091] In step 102, the time it takes for the engine to drop from a preset rated speed to a preset idle speed when each cylinder performs in-cylinder braking is determined.

[0092] For example, an engine contains 4 cylinders, with a preset rated speed of 2000 rpm and a preset idle speed of 500 rpm. In this embodiment, the time it takes for the engine to drop from the preset rated speed to the preset idle speed when each cylinder performs in-cylinder braking is determined. That is, when each cylinder performs in-cylinder braking individually, the time it takes for the engine to drop from 2000 rpm to 500 rpm is determined, resulting in 4 drop times, which correspond to the 4 cylinders respectively.

[0093] In step 103, based on the fall-off time corresponding to each cylinder, the correlation value of the engine speed fall-off speed corresponding to each cylinder is determined, wherein the correlation value of the engine speed fall-off speed characterizes the difference in braking power of different cylinders of the engine.

[0094] In one possible implementation, in step 103, based on the fall-off time corresponding to each cylinder, a relevant value of the engine speed fall-off rate corresponding to each cylinder is determined, and the process is as follows: Figure 2 As shown, it can be implemented as follows:

[0095] In step 201, the minimum fall time in the fall time corresponding to each cylinder is determined.

[0096] In step 202, the ratio of the fall time to the minimum fall time for each cylinder is determined to obtain the relevant value of the engine speed fall rate for each cylinder.

[0097] For example, if an engine has four cylinders, and the corresponding fall-off times for each cylinder are 1.0s, 1.1s, 1.2s, and 1.22s respectively, then the minimum fall-off time for each cylinder is determined to be 1.0s. In ascending order of fall-off times, the ratios of the fall-off time for each cylinder to the minimum fall-off time are 1, 1.1, 1.2, and 1.22 respectively. These four ratios are the relevant values ​​for the engine speed fall-off rate for each cylinder.

[0098] In another possible implementation, the present application embodiment can also set a preset fall time based on historical fall time data, and determine the ratio of the fall time corresponding to each cylinder to the preset fall time, thereby obtaining the relevant value of the engine speed fall rate corresponding to each cylinder.

[0099] In step 104, the relevant value of the engine speed drop rate corresponding to each cylinder is compared with a number of preset relevant value ranges, and the valve clearance state of each cylinder is determined based on the comparison results.

[0100] In one possible implementation, before comparing the relevant value of the engine speed drop rate corresponding to each cylinder with a plurality of preset relevant value intervals, this embodiment of the application determines that the minimum drop time is within a preset time range. If the minimum drop time is greater than the maximum value of the preset time range, then it is determined that the valve clearance of each cylinder of the engine is abnormal. The preset time range is the time range within which the engine drops from a preset rated speed to a preset idle speed when the valve clearance is normal.

[0101] For example, when the minimum fall-off time is 1.0s and the preset time range is 0.8s to 1.2s, the minimum fall-off time is within the preset time range; when the minimum fall-off time is 1.2s and the preset time range is 0.8s to 1.1s, the minimum fall-off time is greater than the maximum value of the preset time range of 1.1s, indicating that the minimum fall-off time is outside the time range for the engine to fall from the preset rated speed to the preset idle speed when the valve clearance is normal. In this embodiment, the valve clearance of each cylinder of the engine is determined to be abnormal.

[0102] It should be added that the above-mentioned preset time range is to limit the fluctuation range of the minimum fall-off time. For the fall-off time of a cylinder that is not the minimum fall-off time, even if the fall-off time is within the preset time range, it does not mean that the valve clearance of the cylinder is normal.

[0103] It should be noted that the step of determining whether the minimum fall-off time is within the preset time range can also be performed after step 102. If the minimum fall-off time is determined to be greater than the maximum value of the preset time range, then steps 103 and 104 do not need to be performed, and the valve clearance abnormality of each cylinder of the engine can be determined. This reduces the step execution time and improves the valve clearance detection efficiency.

[0104] In one possible implementation, in step 104, the relevant value of the engine speed drop rate corresponding to each cylinder is compared with a preset range of multiple relevant value intervals. Based on the comparison results, the valve clearance state of each cylinder is determined, and the process is as follows: Figure 3 As shown, it can be implemented as follows:

[0105] In step 301, for any cylinder, if the correlation value of the engine speed drop rate corresponding to that cylinder is within the first correlation value range, then it is determined that the valve clearance of that cylinder is abnormal.

[0106] In step 302, if the correlation value of the engine speed drop rate corresponding to any cylinder is within the second correlation value range, then it is determined that the valve clearance of that cylinder is normal.

[0107] Among them, the minimum value of the first correlation value interval is greater than the maximum value of the second correlation value interval.

[0108] For example, the first correlation value interval is [1.2, 1.3], the second correlation value interval is [1.0, 1.1], and the engine contains four cylinders A, B, C, and D. The corresponding fall-off times for each cylinder are 1.0s, 1.1s, 1.2s, and 1.22s, respectively. Then, the correlation value of the engine speed fall-off speed for cylinder A is 1, the correlation value of the engine speed fall-off speed for cylinder B is 1.1, the correlation value of the engine speed fall-off speed for cylinder C is 1.2, and the correlation value of the engine speed fall-off speed for cylinder D is 1.22. After comparing the correlation value of the engine speed fall-off speed for each cylinder with the preset multiple correlation value intervals, this embodiment of the application determines that the valve clearance of cylinders C and D is abnormal and can notify the user to adjust the valve clearance of cylinders C and D.

[0109] In summary, the embodiments of this application can control the cylinders of the engine to perform in-cylinder braking, and determine the valve clearance state of each cylinder based on the time it takes for the engine to drop from a preset rated speed to a preset idle speed when each cylinder performs in-cylinder braking. This achieves valve clearance detection without disassembling the engine, reducing workload and improving work efficiency.

[0110] Based on the same inventive concept, this application provides a valve clearance detection device, such as... Figure 4 As shown, the device 400 includes:

[0111] The in-cylinder braking trigger module 401 is configured to control the engine cylinder to perform in-cylinder braking after the engine speed reaches a preset rated speed in response to the detection start signal.

[0112] The fall-off time determination module 402 is configured to determine the fall-off time of the engine from a preset rated speed to a preset idle speed when each cylinder performs in-cylinder braking;

[0113] The correlation value determination module 403 is configured to determine the correlation value of the engine speed drop rate for each cylinder based on the drop time corresponding to each cylinder, wherein the correlation value of the engine speed drop rate characterizes the difference in braking power of different cylinders of the engine.

[0114] The valve clearance state determination module 404 is configured to compare the relevant value of the engine speed drop rate corresponding to each cylinder with a plurality of preset relevant value ranges, and determine the valve clearance state of each cylinder based on the comparison results.

[0115] In one possible implementation, before the controlled engine speed reaches a preset rated speed, the in-cylinder braking trigger module is further configured to:

[0116] Determine that the vehicle meets the safe operating conditions;

[0117] The safe operating conditions include all of the following:

[0118] The engine is running;

[0119] The transmission is in neutral.

[0120] The vehicle is in a parked state;

[0121] The engine operating mode is the normal mode, which is the operating mode in which the throttle response speed is within a preset speed range and the torque is within a preset torque range.

[0122] In one possible implementation, the in-cylinder brake trigger module is further configured to:

[0123] If it is determined that the vehicle does not meet the safety operating conditions, a warning signal is issued so that the user can make adjustments to the vehicle and reassess whether the vehicle meets the safety operating conditions.

[0124] In one possible implementation, the correlation value determination module for determining the engine speed drop rate for each cylinder based on the drop time for each cylinder is configured to:

[0125] Determine the minimum fall-off time within the fall-off time corresponding to each cylinder;

[0126] The ratio of the fall-off time for each cylinder to the minimum fall-off time is determined to obtain the relevant value of the engine speed fall-off rate for each cylinder.

[0127] In one possible implementation, before comparing the relevant value of the engine speed drop rate corresponding to each cylinder with a plurality of preset relevant value ranges, the valve clearance state determination module is further configured to:

[0128] The minimum drop-off time is determined to be within a preset time range, wherein the preset time range is the time range within which the engine drops from a preset rated speed to a preset idle speed when the valve clearance is normal.

[0129] In one possible implementation, the valve clearance state determination module is further configured to:

[0130] If the minimum fall-off time is greater than the maximum value of the preset time range, then the valve clearance of each cylinder of the engine is determined to be abnormal.

[0131] In one possible implementation, the process of comparing the relevant value of the engine speed drop rate corresponding to each cylinder with a preset plurality of relevant value intervals, and determining the valve clearance state of each cylinder based on the comparison results, wherein the valve clearance state determination module is configured to:

[0132] For any given cylinder, if the correlation value of the engine speed drop rate corresponding to that cylinder is within the first correlation value range, then the valve clearance of that cylinder is determined to be abnormal.

[0133] If the correlation value of the engine speed drop rate corresponding to any cylinder is within the second correlation value range, then it is determined that the valve clearance of the cylinder is normal.

[0134] The minimum value of the first correlation value interval is greater than the maximum value of the second correlation value interval.

[0135] The following reference Figure 5 To describe an electronic device 130 according to this embodiment of the present application. Figure 5 The electronic device 130 shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0136] like Figure 5 As shown, the electronic device 130 is presented in the form of a general-purpose electronic device. The components of the electronic device 130 may include, but are not limited to: at least one processor 131, at least one memory 132, and a bus 133 connecting different system components (including memory 132 and processor 131).

[0137] Bus 133 represents one or more of several bus structures, including a memory bus or memory controller, peripheral bus, processor, or local bus using any of the various bus structures.

[0138] The memory 132 may include a readable medium in the form of volatile memory, such as random access memory (RAM) 1321 and / or cache memory 1322, and may further include read-only memory (ROM) 1323.

[0139] The memory 132 may also include a program / utility 1325 having a set (at least one) of program modules 1324, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0140] Electronic device 130 can also communicate with one or more external devices 134 (e.g., keyboard, pointing device, etc.), and with one or more devices that enable a user to interact with electronic device 130, and / or with any device that enables electronic device 130 to communicate with one or more other electronic devices (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 135. Furthermore, electronic device 130 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 136. As shown, network adapter 136 communicates with other modules used in electronic device 130 via bus 133. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with electronic device 130, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0141] In an exemplary embodiment, this application also provides a computer-readable storage medium including instructions, such as a memory 132 including instructions, which can be executed by a processor 131 of an electronic device 130 to complete the valve clearance detection method described above. Optionally, the computer-readable storage medium may be a non-transitory computer-readable storage medium, such as a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device.

[0142] In an exemplary embodiment, a computer program product is also provided, including a computer program that, when executed by a processor 131, implements the valve clearance detection method provided in this application.

[0143] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0144] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0145] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0146] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0147] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for detecting valve clearance, characterized in that, The method includes: In response to the detection start signal, after the engine speed is controlled to reach the preset rated speed, the engine cylinder is controlled to perform in-cylinder braking. Determine the time it takes for the engine to drop from a preset rated speed to a preset idle speed when each cylinder performs in-cylinder braking; The minimum fall time in the fall time corresponding to each cylinder is determined, and the ratio of the fall time corresponding to each cylinder to the minimum fall time is determined to obtain the correlation value of the engine speed fall rate corresponding to each cylinder, wherein the correlation value of the engine speed fall rate characterizes the difference in braking power of different cylinders of the engine. The relevant value of the engine speed drop rate corresponding to each cylinder is compared with multiple preset relevant value ranges, and the valve clearance state of each cylinder is determined based on the comparison results. Before comparing the correlation value of the engine speed drop rate corresponding to each cylinder with a preset range of correlation values, the method further includes: The minimum drop-off time is determined to be within a preset time range, wherein the preset time range is the time range within which the engine drops from a preset rated speed to a preset idle speed when the valve clearance is normal, and the preset time range is used to limit the fluctuation range of the minimum drop-off time.

2. The method according to claim 1, characterized in that, Before the engine speed reaches the preset rated speed, the method further includes: Determine that the vehicle meets the safe operating conditions; The safe operating conditions include all of the following: The engine is running; The transmission is in neutral. The vehicle is in a parked state; The engine operating mode is the normal mode, which is the operating mode in which the throttle response speed is within a preset speed range and the torque is within a preset torque range.

3. The method according to claim 2, characterized in that, The method further includes: If it is determined that the vehicle does not meet the safety operating conditions, a warning signal is issued so that the user can make adjustments to the vehicle and reassess whether the vehicle meets the safety operating conditions.

4. The method according to claim 1, characterized in that, The method further includes: If the minimum fall-off time is greater than the maximum value of the preset time range, then the valve clearance of each cylinder of the engine is determined to be abnormal.

5. The method according to any one of claims 1 to 3, characterized in that, The step of comparing the relevant value of the engine speed drop rate corresponding to each cylinder with a preset range of relevant values, and determining the valve clearance state of each cylinder based on the comparison results, includes: For any given cylinder, if the correlation value of the engine speed drop rate corresponding to that cylinder is within the first correlation value range, then the valve clearance of that cylinder is determined to be abnormal. If the correlation value of the engine speed drop rate corresponding to any cylinder is within the second correlation value range, then it is determined that the valve clearance of the cylinder is normal. The minimum value of the first correlation value interval is greater than the maximum value of the second correlation value interval.

6. A valve clearance detection device, characterized in that, The device includes: The in-cylinder braking trigger module is configured to control the engine cylinder to perform in-cylinder braking after the engine speed reaches the preset rated speed in response to the detection start signal. The fallback time determination module is configured to determine the fallback time of the engine from a preset rated speed to a preset idle speed when each cylinder performs in-cylinder braking; The correlation value determination module is configured to determine the minimum fall time in the fall time corresponding to each cylinder, and determine the ratio of the fall time corresponding to each cylinder to the minimum fall time, to obtain the correlation value of the engine speed fall rate corresponding to each cylinder, wherein the correlation value of the engine speed fall rate characterizes the difference in braking power of different cylinders of the engine. The valve clearance state determination module is configured to compare the relevant value of the engine speed drop rate corresponding to each cylinder with a number of preset relevant value ranges, and determine the valve clearance state of each cylinder based on the comparison results. Before comparing the relevant value of the engine speed drop rate for each cylinder with multiple preset relevant value ranges, the valve clearance state determination module is further configured to: The minimum drop-off time is determined to be within a preset time range, wherein the preset time range is the time range within which the engine drops from a preset rated speed to a preset idle speed when the valve clearance is normal, and the preset time range is used to limit the fluctuation range of the minimum drop-off time.

7. An electronic device, characterized in that, include: Processor and memory; The memory is used to store the processor-executable instructions; The processor is configured to execute the instructions to implement the valve clearance detection method as described in any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, When the instructions in the computer-readable storage medium are executed by the processor of the electronic device, the electronic device is able to perform the valve clearance detection method as described in any one of claims 1-5.

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