Anomaly detection method and apparatus

Abstract

This application provides an anomaly detection method and apparatus. When it is determined that the plastic coating on the synchronizer's shift fork has detached, historical anomaly events obtained during the synchronizer's operation are acquired. If the historical anomaly events include a first event but not a second event, the cause of the shift fork detachment is determined to be rapid wear due to tooth wear during synchronization. The first event includes the shift fork's maximum shift displacement exceeding a preset shift displacement during the shifting phase, where the maximum shift displacement is the distance between the shift fork's shift threshold position and its maximum shift position. If the historical anomaly events include a second event but not the first event, the cause of the shift fork detachment is determined to be gradual wear due to wear during synchronization. The second event includes the shift fork's on-grid control parameters exceeding a preset range during the shift control phase. By recording and analyzing historical anomaly events, the cause of the shift fork detachment can be determined, facilitating after-sales troubleshooting and analysis.

Description

Technical Field

[0001] This application relates to the field of vehicles, and in particular to an anomaly detection method and apparatus. Background Technology

[0002] As more and more vehicles are put into use, the detection of anomalies in vehicle hardware is becoming increasingly important. For example, existing vehicle synchronizer detection typically includes gear shifting failure, gear shifting failure, and gear disengagement. When hardware anomalies affect the safe use of the entire vehicle, timely detection of faults can be achieved, and corresponding fault actions can be taken to ensure the safe operation of the vehicle.

[0003] However, current synchronizer testing methods primarily target abnormal results and cannot pinpoint the cause of hardware malfunctions, posing significant challenges to after-sales troubleshooting and analysis. For instance, regarding the detachment of the synchronizer shift fork's plastic coating, while hardware malfunctions can be identified during vehicle use through methods such as gear slippage, failed gear engagement, or clutch slippage, the underlying cause of the detachment remains untraceable. Therefore, determining the cause of hardware malfunctions is a pressing issue requiring resolution in this field. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide an anomaly detection method and apparatus capable of detecting the cause of hardware anomalies. The specific solution is as follows:

[0005] Firstly, this application provides an anomaly detection method, including:

[0006] When it is determined that the plastic wrapping of the synchronizer's shift fork has detached, historical abnormal events obtained during the operation of the synchronizer are acquired.

[0007] If the historical abnormal events include the first event but not the second event, the cause of the synchronizer's shift fork plastic detachment is determined to be rapid wear caused by tooth breakage during the synchronization process; the first event includes the shift fork's maximum shift displacement being greater than a preset shift displacement during the shifting phase, and the maximum shift displacement of the shift fork is the distance between the shift fork's shifting threshold position and the maximum shift position;

[0008] If the historical abnormal events include the second event but not the first event, the cause of the synchronizer's shift fork plastic detachment is determined to be progressive wear caused by wear during the synchronization process; the second event includes the shift fork's in-gear control parameters exceeding the preset range during the gear control phase.

[0009] Optionally, if the historical abnormal events include a first event and a second event, then if the first event occurs before the second event, the cause of the synchronizer's fork plastic coating detachment is determined to be rapid wear; if the first event occurs after the second event, the cause of the synchronizer's fork plastic coating detachment is determined to be gradual wear.

[0010] Optionally, the historical abnormal events include the initial vehicle mileage. When the historical abnormal events include multiple abnormal events, the abnormal event that occurred earliest is the abnormal event with the shortest initial vehicle mileage.

[0011] Optionally, if the historical abnormal events include a first event but not a second event, the number of times the first event occurs is recorded, and / or the maximum forward displacement of the shift fork when the first event occurs is recorded; if the historical abnormal events include a second event but not a first event, the number of times the second event occurs is recorded, and / or the maximum value of the shift fork's in-gear control parameter is recorded.

[0012] Optionally, the gear control parameters of the shift fork during the gear control phase include at least one of the following: gear control force, maximum pressure of the hydraulic actuator, maximum flow rate of the hydraulic actuator, maximum voltage of the electric shift actuator, and maximum current of the electric shift actuator.

[0013] Secondly, embodiments of this application also provide an anomaly detection device, including:

[0014] The acquisition unit is used to acquire historical abnormal events obtained during the operation of the synchronizer when it is determined that the plastic wrapping of the synchronizer's shift fork has fallen off;

[0015] The determining unit is configured to, if the historical abnormal events include a first event but not a second event, determine that the cause of the synchronizer's shift fork plastic coating detachment is rapid wear caused by tooth grinding during the synchronization process; the first event includes the shift fork's maximum shift displacement being greater than a preset shift displacement during the shifting phase, the maximum shift displacement being the distance between the shift fork's shifting threshold position and the maximum shift position; if the historical abnormal events include a second event but not a first event, determine that the cause of the synchronizer's shift fork plastic coating detachment is gradual wear caused by wear during the synchronization process; the second event includes the shift control parameters of the shift fork exceeding a preset range during the shift control phase.

[0016] Optionally, the determining unit is further configured to, if the historical abnormal events include a first event and a second event, determine that the cause of the synchronizer's fork plastic coating detachment is rapid wear when the first event occurs before the second event, and determine that the cause of the synchronizer's fork plastic coating detachment is gradual wear when the first event occurs after the second event.

[0017] Optionally, the historical abnormal events include the initial vehicle mileage. When the historical abnormal events include multiple abnormal events, the abnormal event that occurred earliest is the abnormal event with the shortest initial vehicle mileage.

[0018] Optionally, the determining unit is further configured to: if the historical abnormal events include a first event but not a second event, record the number of times the first event occurs, and / or record the maximum forward displacement of the shift fork when the first event occurs; if the historical abnormal events include a second event but not a first event, record the number of times the second event occurs, and / or record the maximum value of the shift fork's in-gear control parameter.

[0019] Optionally, the gear control parameters of the shift fork during the gear control phase include at least one of the following: gear control force, maximum pressure of the hydraulic actuator, maximum flow rate of the hydraulic actuator, maximum voltage of the electric shift actuator, and maximum current of the electric shift actuator.

[0020] This application provides an anomaly detection method and apparatus. When it is determined that the plastic coating on the synchronizer's shift fork has detached, historical anomaly events obtained during the synchronizer's operation are acquired. If the historical anomaly events include a first event but not a second event, the cause of the shift fork detachment is determined to be rapid wear due to tooth wear during synchronization. The first event includes the shift fork's maximum shift displacement exceeding a preset shift displacement during the shifting phase, where the maximum shift displacement is the distance between the shift fork's shift threshold position and its maximum shift position. If the historical anomaly events include a second event but not the first event, the cause of the shift fork detachment is determined to be gradual wear due to wear during synchronization. The second event includes the shift fork's on-grid control parameters exceeding a preset range during the shift control phase. Therefore, by recording and analyzing historical anomaly events when the shift fork detaches, the cause of the detachment can be determined, facilitating after-sales troubleshooting and analysis. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A flowchart illustrating an anomaly detection method provided in an embodiment of this application is shown.

[0023] Figure 2A schematic diagram of a lock-ring type inertial synchronizer provided in an embodiment of this application is shown;

[0024] Figure 3 A schematic diagram of a synchronizer shifting process provided in an embodiment of this application is shown;

[0025] Figure 4 This invention provides a schematic diagram showing the positions of the shift fork and the coupling sleeve according to an embodiment of the present application.

[0026] Figure 5 An actual photograph of a shift fork provided in an embodiment of this application is shown;

[0027] Figure 6 The present application provides schematic diagrams of several synchronizer engagement states according to embodiments thereof;

[0028] Figure 7 This document illustrates a flowchart of an embodiment of the present application when the historical abnormal events include a first event and a second event.

[0029] Figure 8 This is a schematic diagram of an anomaly detection device provided in an embodiment of this application. Detailed Implementation

[0030] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] As described in the background section, regarding the situation where the plastic coating on the synchronizer shift fork detaches, although during vehicle use, the hardware malfunction of the synchronizer can be identified by means of disengagement, failure to engage gears, or clutch slippage, the cause of the plastic coating detaching from the synchronizer shift fork remains unknown.

[0033] Based on the above technical problems, this application provides an anomaly detection method and apparatus. When it is determined that the plastic coating on the synchronizer's shift fork has detached, historical anomaly events obtained during the synchronizer's operation are acquired. If the historical anomaly events include a first event but not a second event, the cause of the shift fork detachment is determined to be rapid wear caused by tooth grinding during synchronization. The first event includes the shift fork's maximum shift displacement exceeding a preset shift displacement during the shifting phase, where the maximum shift displacement is the distance between the shift fork's shift threshold position and the maximum shift position. If the historical anomaly events include a second event but not the first event, the cause of the shift fork detachment is determined to be gradual wear caused by wear during synchronization. The second event includes the shift fork's on-grid control parameters exceeding a preset range during the shift control phase. Therefore, by recording and analyzing historical anomaly events when the shift fork detaches, the cause of the detachment can be determined, facilitating after-sales troubleshooting and analysis.

[0034] For ease of understanding, the following detailed description of an anomaly detection method and apparatus provided in the embodiments of this application is provided in conjunction with the accompanying drawings.

[0035] refer to Figure 1 The diagram shown is a flowchart of an anomaly detection method provided in an embodiment of this application. The method may include the following steps.

[0036] S101, when it is determined that the plastic wrapping of the synchronizer's shift fork has fallen off, acquire historical abnormal events obtained during the operation of the synchronizer.

[0037] In this embodiment, the plastic coating detachment of the shift fork refers to the detachment of the plastic coating covering the outside of the shift fork foot. Historical abnormal events are collected during the operation of the synchronizer. Acquisition refers to retrieving and analyzing the collected data when the plastic coating detachment of the shift fork is discovered.

[0038] In this embodiment, when shifting gears in a manual transmission vehicle, the rotational speeds of the power output gear and the transmission gears must be synchronized to complete the shift. A synchronizer in the transmission allows the engaging gears and engaging sleeves to quickly synchronize, completing the shift. The synchronizer can be a locking ring type inertial synchronizer, see reference [reference needed]. Figure 2 A schematic diagram of a locking ring type inertial synchronizer is shown. The locking ring type inertial synchronizer includes a gear to be engaged 1, a synchronization ring 2, an engagement sleeve 3, a positioning pin 4, a slider 5, a spring 6, and a splined hub 7.

[0039] The synchronizer's gear-shifting process mainly consists of several stages: pre-synchronization clearing of idle travel, synchronization, clearing of idle travel during gear shifting, and the gear-shifting phase. After gear shifting is completed, the synchronizer's control switches to in-gear control. Figure 3A schematic diagram of a synchronizer shifting process is shown. The division of each stage is based on the relative positions of the spline teeth within the engagement sleeve, the engagement teeth of the synchronizing ring, and the teeth to be engaged. The shifting direction of the synchronizer in the diagram is from right to left. (a) is the stage of eliminating free travel, (b) is the synchronization stage, (c) is the stage of eliminating shifting free travel, and (d) is the shifting stage. The position boundaries of each shifting stage are measured by position sensors on the shift fork, and after being obtained through a certain method (self-learning process), they are stored in the controller's memory.

[0040] Specifically, when the engagement sleeve shifts from gear one to neutral, refer to... Figure 3 (a) Under the inertia of themselves and the moving parts they are connected to, the gear and the engagement sleeve continue to rotate in their original direction, as shown by the arrow in the figure. To engage gear two, the shift fork needs to move the engagement sleeve, which in turn moves the slider to the left via the locating pin, so that the left end face of the slider contacts the synchronizing ring. The synchronizing ring and the engagement sleeve rotate synchronously. (Refer to...) Figure 3 (b) Then, the locating pin of the coupling sleeve continues to move to the left, and the synchronizing ring engages with the coupling sleeve. (Refer to...) Figure 3 (c) Then, the coupling sleeve and the tooth to be coupled engage, refer to Figure 3 (d)

[0041] Figure 4 The diagram shows the positions of the shift fork and the engagement sleeve. The shift fork is located in the groove of the engagement sleeve. The shift fork is wrapped in plastic on the outside of the shift fork foot. The plastic coating of the shift fork has a certain thickness. The shift fork contacts the side wall of one side of the groove of the engagement sleeve and has a certain gap with the side wall of the other side. The gear shifting force can be applied to the shift fork. The shift fork applies force to the side wall of the engagement sleeve, causing the engagement sleeve to move in the gear shifting direction. Figure 5 A physical image of a shift fork is shown, wherein the shift fork includes two shift fork legs, and the shift fork is wrapped in plastic on the outside of the shift fork legs.

[0042] For a synchronizer in which a position sensor is fixedly connected to a shift fork, a large shifting force is applied by the shift fork during the shifting control phase to push the engagement sleeve in the shifting direction. Figure 6 The diagram illustrates several synchronizer engagement states provided in embodiments of this application, where (a) represents the normal synchronizer engagement state, and (b) and (c) represent the abnormal synchronizer engagement states. In the normal synchronizer engagement state, refer to... Figure 6 As shown in (a), the engaging sleeve meshes with the tooth to be engaged, with the engaging sleeve pointing towards the mechanical end point (END limit position). The contact length between the tooth to be engaged and the engaging sleeve is the effective engagement length. Specifically, under normal engagement conditions of the synchronizer, the position sensor records the position of the shift fork at this time, and after confirming for a certain period of time, the gear shifting control is completed. Switching to in-gear position control, the shift fork is controlled within a position bandwidth within the maximum position, maintaining the effective engagement length between the engaging sleeve and the tooth to be engaged, while preventing the shift fork from prolonged contact with the inner groove of the engaging sleeve. The corresponding in-gear control force is calculated through a PI closed-loop system.

[0043] When it is determined that the synchronizer's fork has detached from its plastic coating, acquire historical abnormal events obtained during the synchronizer's operation.

[0044] In this embodiment, if gear grinding occurs during the shifting phase due to unsuitable design dimensions or excessive error (dimensional interference), the cause of the shift fork's plastic coating detachment is considered to be rapid wear. (Reference) Figure 6 As shown in (b), due to unsuitable design dimensions, when the shift fork in the synchronizer reaches the preset position, the engagement sleeve does not reach the END limit position. The actual position of the engagement sleeve deviates from the measured position of the engagement sleeve obtained based on the position of the shift fork. During the gear shifting stage, it is mistakenly judged as gear shifting completed, and tooth knocking occurs when the power source outputs torque, causing rapid wear of the plastic coating on the shift fork.

[0045] Specifically, if the axial dimensions of the synchronizer interfere due to unsuitable design dimensions or production inconsistencies, control problems may arise during the synchronization and shifting stages of gear control. For example, it may be difficult to eliminate the synchronization speed difference at the end of the synchronization stage. During the shifting stage, misjudgment of gear engagement completion may occur. For instance, the synchronizer may not have actually reached the shifting position, but due to dimensional errors, it may be mistakenly considered that gear engagement is complete. The power source outputs torque, and there is a scissor difference between the torque and the teeth to be engaged between the synchronizer engagement sleeve and the teeth to be engaged, causing tooth breakage. At this time, the plastic coating of the shift fork, which has not yet worn or fallen off, is easily subjected to impact torque, causing the plastic coating of the shift fork to wear and fall off rapidly.

[0046] In this embodiment, due to the rapid wear caused by tooth wear during the gear engagement phase, the maximum gear engagement displacement of the shift fork during the engagement phase can be determined by whether it exceeds a preset gear engagement displacement. Specifically, a large gear engagement force is applied during the synchronizer's gear engagement phase, the engaging sleeve meshes with the tooth to be engaged, and the engaging sleeve pushes towards the mechanical end point (END limit position). The position sensor records the position of the shift fork at this time as the maximum gear engagement position of the shift fork. Then, the shift fork is controlled within a position bandwidth within the maximum position, maintaining the effective engagement length between the engaging sleeve and the tooth to be engaged, while preventing the shift fork from prolonged contact with the inner groove of the engaging sleeve. The position sensor records the position of the shift fork just before disengagement as the threshold position of the shift fork's gear engagement. The maximum gear engagement displacement of the shift fork is the distance between the threshold position and the maximum gear engagement position. The preset gear engagement displacement is the maximum reasonable boundary dimension of the shift fork position determined based on design dimensions and experience.

[0047] In this embodiment, if the synchronizer size is normal, the shifting phase is relatively normal and there will be no gear grinding. However, during the shifting phase, improper control parameters, such as control accuracy deviation, may cause the shift fork to always be in close contact with the synchronizer engagement sleeve. The plastic-coated shift fork bears the friction torque, which can easily lead to progressive wear.

[0048] refer to Figure 6As shown in (c), during the gearing stage, the engagement sleeve is at the disengagement boundary, but the engagement sleeve has not yet disengaged. Under the action of the gearing control force, the engagement sleeve is tightly fitted with the inclined surface of the gear to be engaged, and the torque is transmitted through the inclined surface. Due to the large gearing control force, the plastic coating of the shift fork is prone to progressive wear.

[0049] In this embodiment, due to the progressive wear caused by wear during the synchronization process, the wear can be determined by whether the shift fork's gear control parameters exceed a preset range during the gear shifting phase. Specifically, during the synchronizer's gear shifting control phase, the shift fork's gear shifting control parameters are constantly monitored, including but not limited to relevant parameters of different actuators. The shift fork's gear shifting control parameters include at least one of the following: gear control force, maximum pressure of the hydraulic actuator, maximum flow rate of the hydraulic actuator, maximum voltage of the electric shifting actuator, and maximum current of the electric shifting actuator.

[0050] S102, if the historical abnormal events include the first event but not the second event, determine that the cause of the synchronizer's fork plastic detachment is rapid wear caused by tooth breakage during the synchronization process.

[0051] In this embodiment, the first event includes the shift fork's maximum shift displacement being greater than a preset shift displacement during the shifting phase. The maximum shift displacement of the shift fork is the distance between the shift threshold position and the maximum shift position of the shift fork. If the historical abnormal events include the first event but not the second event, it indicates that the shift fork's maximum shift displacement is greater than the preset shift displacement during the shifting phase. In this case, it is determined that the shift fork's plastic coating has detached, and the cause is rapid wear due to tooth wear during the synchronization process.

[0052] In this embodiment of the application, if the historical abnormal events include a first event but not a second event, the number of occurrences of the first event is recorded, and / or, the maximum shift fork displacement when the first event occurs is recorded. Specifically, if the maximum shift fork displacement during the shifting phase is greater than a preset shift displacement, the event is recorded as the first event, and the number of occurrences of the first event n1 (initially 0) is incremented by 1. The vehicle mileage h1 at the first occurrence of the first event can also be recorded, as well as the maximum shift fork displacement y when the first event occurs, etc.

[0053] S103, if the historical abnormal events include the second event but not the first event, determine that the cause of the synchronizer's fork plastic detachment is progressive wear caused by wear during the synchronization process.

[0054] In this embodiment, the second event includes the shift fork's in-gear control parameter exceeding a preset range during the gear control phase. If the historical abnormal events include the second event but not the first event, it indicates that the shift fork's in-gear control parameter exceeds the preset range during the gear control phase, thus determining that the shift fork's plastic coating has detached, the cause being progressive wear due to wear during the synchronization process.

[0055] In this embodiment, if the historical abnormal events include a second event but not the first event, the number of times the second event occurs is recorded, and / or, the maximum value of the shift fork's gear control parameter is recorded. Specifically, if the shift fork's gear control parameter exceeds a preset range during the gear control phase, this event is recorded as the second event, and the number of times the second event occurs, n2 (initially 0), is incremented by 1. The vehicle mileage h2 at the first occurrence of the second event can also be recorded, as well as the maximum value f of the shift fork's gear control parameter.

[0056] In the embodiments of this application, historical abnormal events may include a first event but not a second event, or a second event but not a first event, or both a first event and a second event. When historical abnormal events include both a first event and a second event, the cause of the shift fork plastic coating detachment can be determined based on the order of occurrence of the first and second events.

[0057] For details, please refer to Figure 7 The diagram shown is a flowchart of an embodiment where the historical abnormal events include a first event and a second event. When it is determined that the synchronizer's shift fork has detached, the historical abnormal events obtained during the operation of the synchronizer are acquired; the initial vehicle mileage of the first event is h1, and the initial vehicle mileage of the second event is h2.

[0058] In this embodiment of the application, it is determined whether the vehicle mileage h1 at the first occurrence of the first event is less than the vehicle mileage h2 at the first occurrence of the second event. If so, it indicates that the first event occurred earlier than the second event, and the cause of the plastic coating detachment of the synchronizer's shift fork is determined to be rapid wear; otherwise, it indicates that the first event did not occur earlier than the second event, and the cause of the plastic coating detachment of the synchronizer's shift fork is determined to be gradual wear.

[0059] This application provides an anomaly detection method. When it is determined that the plastic coating on the synchronizer's shift fork has detached, historical anomaly events obtained during the synchronizer's operation are acquired. If the historical anomaly events include a first event but not a second event, the cause of the shift fork detachment is determined to be rapid wear due to tooth wear during synchronization. The first event includes the shift fork's maximum shift displacement exceeding a preset shift displacement during the shifting phase, where the maximum shift displacement is the distance between the shift fork's shift threshold position and its maximum shift position. If the historical anomaly events include a second event but not the first event, the cause of the shift fork detachment is determined to be gradual wear due to wear during synchronization. The second event includes the shift fork's on-grid control parameters exceeding a preset range during the shift control phase. Therefore, by recording and analyzing historical anomaly events when the shift fork detaches, the cause of the detachment can be determined, facilitating after-sales troubleshooting and analysis.

[0060] Based on the above anomaly detection methods, this application also provides an anomaly detection device, as described above. Figure 8 The diagram shown is a structural block diagram of an anomaly detection device provided in an embodiment of this application. The anomaly detection device may include:

[0061] The acquisition unit 100 is used to acquire historical abnormal events obtained during the operation of the synchronizer when it is determined that the plastic wrapping of the synchronizer's shift fork has fallen off.

[0062] The determination unit 200 is used to determine that the cause of the synchronizer's fork plastic coating falling off is rapid wear caused by tooth breakage during the synchronization process if the historical abnormal events include the first event but not the second event; if the historical abnormal events include the second event but not the first event, the cause of the synchronizer's fork plastic coating falling off is gradual wear caused by wear during the synchronization process.

[0063] Optionally, the determining unit is further configured to determine, if the historical abnormal events include a first event and a second event, that the cause of the synchronizer's fork plastic coating detachment is rapid wear when the first event occurs before the second event, and that the cause of the synchronizer's fork plastic coating detachment is progressive wear when the first event occurs after the second event.

[0064] Optionally, historical anomalies include the initial vehicle mileage. When historical anomalies include multiple anomalies, the anomaly that occurred earliest is the one with the shortest initial vehicle mileage.

[0065] Optionally, the determining unit is further configured to: record the number of times the first event occurs, and / or record the maximum forward displacement of the shift fork when the first event occurs, if the historical abnormal events include the first event but not the second event; record the number of times the second event occurs, and / or record the maximum value of the shift fork's in-gear control parameter, if the historical abnormal events include the second event but not the first event.

[0066] Optionally, the gear control parameters of the shift fork during the gear control phase include at least one of the following: gear control force, maximum pressure of the hydraulic actuator, maximum flow rate of the hydraulic actuator, maximum voltage of the electric shift actuator, and maximum current of the electric shift actuator.

[0067] This application provides an anomaly detection device, including an acquisition unit and a determination unit. The acquisition unit is used to acquire historical anomaly events obtained during the operation of the synchronizer when it is determined that the plastic coating of the synchronizer's shift fork has detached. The determination unit is used to determine that if the historical anomaly events include a first event but not a second event, the cause of the shift fork detachment is rapid wear caused by tooth grinding during the synchronization process. The first event includes the maximum shift displacement of the shift fork exceeding a preset shift displacement during the shifting phase, where the maximum shift displacement is the distance between the shift fork's shifting threshold position and the maximum shift position. If the historical anomaly events include a second event but not the first event, the cause of the shift fork detachment is determined to be gradual wear caused by wear during the synchronization process. The second event includes the shift control parameters of the shift fork exceeding a preset range during the shifting control phase. Therefore, by recording and analyzing historical anomaly events when the plastic coating of the shift fork detaches, the cause of the detachment can be determined, facilitating after-sales troubleshooting and analysis.

[0068] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on its differences from other embodiments. In particular, the apparatus embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0069] The above description is merely a preferred embodiment of this application. Although this application has disclosed preferred embodiments above, it is not intended to limit this application. Any person skilled in the art can make many possible variations and modifications to the technical solutions of this application using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of this application. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this application without departing from the content of the technical solutions of this application shall still fall within the protection scope of the technical solutions of this application.

Claims

1. An anomaly detection method, characterized in that, include: When it is determined that the plastic wrapping of the synchronizer's shift fork has detached, historical abnormal events obtained during the operation of the synchronizer are acquired. If the historical abnormal events include the first event but not the second event, the cause of the synchronizer's shift fork plastic detachment is determined to be rapid wear caused by tooth breakage during the synchronization process; the first event includes the shift fork's maximum shift displacement being greater than a preset shift displacement during the shifting phase, and the maximum shift displacement of the shift fork is the distance between the shift fork's shifting threshold position and the maximum shift position; If the historical abnormal events include the second event but not the first event, the cause of the synchronizer's shift fork plastic detachment is determined to be progressive wear caused by wear during the synchronization process; the second event includes the shift fork's in-gear control parameters exceeding the preset range during the gear control phase.

2. The method according to claim 1, characterized in that, The method further includes: If the historical abnormal events include a first event and a second event, then if the first event occurs before the second event, the cause of the synchronizer's fork plastic coating detachment is determined to be rapid wear; if the first event occurs after the second event, the cause of the synchronizer's fork plastic coating detachment is determined to be gradual wear.

3. The method according to claim 2, characterized in that, The historical anomaly events have the initial vehicle mileage. When the historical anomaly events include multiple anomaly events, the anomaly event that occurred earliest is the anomaly event with the shortest initial vehicle mileage.

4. The method according to claim 1, characterized in that, The method further includes: If the historical abnormal events include the first event but not the second event, record the number of times the first event occurs, and / or record the maximum forward displacement of the shift fork when the first event occurs; if the historical abnormal events include the second event but not the first event, record the number of times the second event occurs, and / or record the maximum value of the shift fork's in-gear control parameter.

5. The method according to any one of claims 1-4, characterized in that, During the gear control phase, the gear control parameters of the shift fork include at least one of the following: gear control force, maximum pressure of the hydraulic actuator, maximum flow rate of the hydraulic actuator, maximum voltage of the electric shift actuator, and maximum current of the electric shift actuator.

6. An anomaly detection device, characterized in that, include: The acquisition unit is used to acquire historical abnormal events obtained during the operation of the synchronizer when it is determined that the plastic wrapping of the synchronizer's shift fork has fallen off; The determining unit is configured to determine, if the historical abnormal events include a first event but not a second event, that the cause of the synchronizer's shift fork plastic detachment is rapid wear caused by tooth breakage during the synchronization process; the first event includes the shift fork's maximum shift displacement being greater than a preset shift displacement during the shifting phase, wherein the maximum shift displacement of the shift fork is the distance between the shift fork's shifting threshold position and the maximum shift position; If the historical abnormal events include the second event but not the first event, the cause of the synchronizer's shift fork plastic detachment is determined to be progressive wear caused by wear during the synchronization process; the second event includes the shift fork's in-gear control parameters exceeding the preset range during the gear control phase.

7. The apparatus according to claim 6, characterized in that, The determining unit is further configured to: If the historical abnormal events include a first event and a second event, then if the first event occurs before the second event, the cause of the synchronizer's fork plastic coating detachment is determined to be rapid wear; if the first event occurs after the second event, the cause of the synchronizer's fork plastic coating detachment is determined to be gradual wear.

8. The apparatus according to claim 7, characterized in that, The historical anomaly events have the initial vehicle mileage. When the historical anomaly events include multiple anomaly events, the anomaly event that occurred earliest is the anomaly event with the shortest initial vehicle mileage.

9. The apparatus according to claim 6, characterized in that, The determining unit is further configured to: If the historical abnormal events include the first event but not the second event, record the number of times the first event occurs, and / or record the maximum forward displacement of the shift fork when the first event occurs; if the historical abnormal events include the second event but not the first event, record the number of times the second event occurs, and / or record the maximum value of the shift fork's in-gear control parameter.

10. The apparatus according to any one of claims 6-9, characterized in that, During the gear control phase, the gear control parameters of the shift fork include at least one of the following: gear control force, maximum pressure of the hydraulic actuator, maximum flow rate of the hydraulic actuator, maximum voltage of the electric shift actuator, and maximum current of the electric shift actuator.

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