A gear clutch protection method, device and storage medium

Abstract

The application discloses a gear clutch protection method, equipment and storage medium, wherein the gear clutch protection method comprises the following steps: an automatic transmission control unit sends a shutdown permission signal to an engine control unit, the engine control unit controls the engine to enter a start-stop shutdown process; the automatic transmission control unit acquires a gear clutch risk point; and the automatic transmission control unit outputs a gear clutch protection strategy according to the gear clutch risk point. The technical scheme of the application can effectively solve the problem that the gear clutch of a hydro-mechanical automatic transmission is ablated due to the failure of the vehicle system to cause the engine to be unable to stop during the start-stop shutdown process of the engine, thereby improving the reliability and safety of the gear clutch.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle control, and in particular to a gear clutch protection method, device and storage medium. BACKGROUND

[0002] Engine start-stop function refers to that the engine control unit can stop and start the engine operation according to the vehicle operating state, so as to achieve the effect of oil saving and emission reduction. In order to ensure the rapid start performance of the vehicle after starting, a small electric oil pump is provided in some hydro-mechanical automatic transmissions, which is used to maintain the oil pressure of the first gear clutch at a relatively low value after the engine start-stop function is started and it is determined that the engine is allowed to stop.

[0003] In the start-stop process of the vehicle equipped with the hydro-mechanical automatic transmission, when the vehicle system has a fault and the engine cannot stop after the hydro-mechanical automatic transmission control unit sends a stop permission signal, the engine will continue to operate with the turbine of the hydro-torque converter under the torque increasing effect of the hydro-torque converter, and further drive the driving disc of the first gear clutch mechanically connected to the rear end of the turbine of the hydro-torque converter. Since the engine start-stop generally occurs in the vehicle stopped state, the driven disc of the first gear clutch has a speed of 0, and the first gear clutch maintains a certain oil pressure under the action of the electric pump at this time, and the heat capacity of the gear clutch of the hydro-mechanical automatic transmission is relatively small. Therefore, under this condition, the first gear clutch is easy to be ablated. SUMMARY

[0004] The present application provides a gear clutch protection method, device and storage medium to solve the problem that the first gear clutch of the hydro-mechanical automatic transmission is ablated due to the engine failure to stop in the engine start-stop process of the vehicle equipped with the hydro-mechanical automatic transmission.

[0005] According to an aspect of the present application, a gear clutch protection method is provided, which comprises:

[0006] The automatic transmission control unit sends a stop permission signal to the engine control unit, and the engine control unit controls the engine to enter the start-stop process;

[0007] The automatic transmission control unit obtains the gear clutch risk point;

[0008] The automatic transmission control unit outputs the gear clutch protection strategy according to the gear clutch risk point.

[0009] Optionally, before the automatic transmission control unit sends a stop permission signal to the engine control unit and the engine control unit controls the engine to enter the start-stop process, the method further comprises:

[0010] When the automatic transmission control unit monitors that the signals of the vehicle system meet the first start-stop shutdown requirement of the engine, the automatic transmission control unit sends a shutdown enabling signal to the engine control unit, and the engine control unit further judges whether the current driving state of the vehicle meets the second start-stop shutdown requirement of the engine after receiving the shutdown enabling signal;

[0011] If yes, the engine control unit sends a shutdown request signal to the automatic transmission control unit, and the automatic transmission control unit further judges whether the vehicle is in the shifting process after receiving the shutdown request signal sent by the engine control unit;

[0012] If the vehicle is not in the shifting process, the automatic transmission control unit sends a shutdown permission signal to the engine control unit.

[0013] Optionally, the automatic transmission control unit obtains the gear clutch risk point, including:

[0014] The automatic transmission control unit obtains a vehicle system fault signal and / or an engine speed abnormality fault signal in the vehicle system.

[0015] Optionally, the automatic transmission control unit outputs the gear clutch protection strategy according to the gear clutch risk point, including:

[0016] The automatic transmission control unit outputs an electric pump shutdown instruction to control the gear clutch oil pressure to drop to 0.

[0017] Optionally, the automatic transmission control unit obtains the vehicle system fault signal in the vehicle system, including:

[0018] The engine control unit monitors whether there is a fault affecting the start-stop shutdown of the engine in the current vehicle system at all times;

[0019] If yes, the engine control unit sends a vehicle system fault signal to the automatic transmission control unit.

[0020] Optionally, the automatic transmission control unit obtains the engine speed abnormality fault signal in the vehicle system, including:

[0021] The automatic transmission control unit obtains an initial time t0 of the engine entering the start-stop shutdown process and a shutdown time threshold t;

[0022] The automatic transmission control unit obtains the engine speed at t0+t;

[0023] The automatic transmission control unit judges whether the engine speed is 0;

[0024] If no, the automatic transmission control unit determines that the engine speed is abnormal and generates an engine speed abnormality fault signal.

[0025] Optionally, the automatic transmission control unit sends a stop permission signal to the engine control unit, which then controls the engine to enter the start-stop process, including:

[0026] The automatic transmission control unit controls the gear clutch oil pressure to begin decreasing;

[0027] When the gear clutch oil pressure drops to the target oil pressure, the automatic transmission control unit controls the electric pump to start, maintaining the gear clutch oil pressure at the target oil pressure.

[0028] Optionally, after the automatic transmission control unit sends a stop permission signal to the engine control unit, and the engine control unit controls the engine to enter the start-stop process, the following is also included:

[0029] The automatic transmission control unit failed to detect the gear clutch risk point;

[0030] The automatic transmission control unit outputs an electric pump start command to maintain the gear clutch oil pressure until the automatic transmission control unit no longer sends a stop permission signal.

[0031] According to another aspect of the present invention, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a gear clutch protection method.

[0032] According to another aspect of the present invention, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements a gear clutch protection method.

[0033] The technical solution of this invention, by acquiring the risk point of the gear clutch during engine start-stop and shutdown, and outputting a gear clutch protection strategy based on the risk point, can effectively solve the problem of gear clutch burning in vehicles equipped with hydraulic-mechanical automatic transmissions during engine start-stop and shutdown due to vehicle system failures causing the engine to fail to stop, thereby improving the reliability and safety of the gear clutch. In addition, the technical solution of this invention only requires improving the control strategies of the engine control unit and the automatic transmission control unit, without adding or changing the hardware structure. This method is simple, practical, highly feasible, and low in cost.

[0034] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a flowchart of a first gear clutch protection method provided according to an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the start-stop process control of a vehicle equipped with a hydraulic-mechanical automatic transmission according to an embodiment of the present invention;

[0038] Figure 3 This is a flowchart of a second gear clutch protection method provided according to an embodiment of the present invention;

[0039] Figure 4 This is a flowchart of a third gear clutch protection method provided according to an embodiment of the present invention;

[0040] Figure 5 This is a flowchart of the fourth gear clutch protection method provided by an embodiment of the present invention;

[0041] Figure 6 This is a flowchart of the fifth gear clutch protection method provided by an embodiment of the present invention;

[0042] Figure 7 This is a flowchart of the sixth gear clutch protection method provided by an embodiment of the present invention;

[0043] Figure 8 This is a flowchart of the seventh gear clutch protection method provided by an embodiment of the present invention;

[0044] Figure 9 This is a flowchart of the eighth gear clutch protection method provided according to an embodiment of the present invention. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0047] Figure 1 This is a flowchart of a first gear clutch protection method provided according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the start-stop process control of a vehicle equipped with a hydraulic-mechanical automatic transmission according to an embodiment of the present invention. The technical solution of this embodiment can be applied to the protection of the gear clutch in a hydraulic-mechanical automatic transmission under engine start-stop conditions. Combined with... Figure 1 and Figure 2 As shown, the method includes:

[0048] S10. The automatic transmission control unit sends a stop permission signal to the engine control unit, which then controls the engine to enter the start-stop process.

[0049] First, the automatic transmission control unit (ATU) constantly monitors the vehicle's gear position, speed, brake pedal status, transmission fluid temperature, shift lever position, and transmission malfunctions. When all conditions meet the engine start-stop requirements, the ATU sends a stop enable signal to the engine control unit (ECU), indicating that the engine is ready to stop. Then, the ECU also constantly monitors vehicle speed, shift lever position, brake pedal status, and road gradient. Upon receiving the stop enable signal from the ATU, if all monitored signals meet the engine start-stop conditions, it sends a stop request signal to the ATU. Finally, upon receiving the stop request signal from the ECU, if the ATU detects that the vehicle is not in the process of shifting gears, it sends a stop permission signal to the ECU, indicating that the engine can now stop. Upon receiving the stop permission signal, the ECU then controls the engine to enter the start-stop process.

[0050] After entering the engine start-stop process, the oil pressure of the first gear clutch in the hydraulic-mechanical automatic transmission begins to drop. When the oil pressure of the first gear clutch drops to the target oil pressure, the automatic transmission control unit controls the electric pump to start and maintain the oil pressure of the first gear clutch at the target oil pressure value. This target oil pressure value depends on the capacity of the electric pump and is not adjustable.

[0051] S11, Automatic transmission control unit obtains gear clutch risk points.

[0052] Among them, the risk points of the gear clutch may be vehicle system failures that cause gear clutch burning or abnormal engine speed during engine start-stop and shutdown processes.

[0053] Specifically, during engine start-stop operation, if a vehicle system malfunction, such as a crankshaft position sensor failure, prevents the engine from stopping, the torque converter's torque amplification effect will cause the engine to continuously drive the torque converter's turbine. This, in turn, drives the driving disc of the first-gear clutch, mechanically connected to the turbine's rear end, to continuously rotate. Since engine start-stop typically occurs when the vehicle is stationary, the driven disc of the first-gear clutch rotates at zero speed. At this time, the first-gear clutch is maintained at the target oil pressure by the electric pump, and given the relatively small heat capacity of the gear clutch in a hydraulic-mechanical automatic transmission, it is highly susceptible to burning. In this situation, the engine control unit (ECU) will identify the vehicle system malfunction causing the risk of gear clutch burning and send it to the automatic transmission control unit (ATU). Alternatively, the ATU may identify an abnormal engine speed malfunction causing the risk of gear clutch burning. The ATU thus identifies the risk point of the gear clutch through these two methods.

[0054] S12, The automatic transmission control unit outputs a gear clutch protection strategy based on the risk points of the gear clutch.

[0055] Among them, the gear clutch protection strategy involves the automatic transmission control unit outputting a command to shut down the electric pump, thereby controlling the electric pump to turn off.

[0056] The technical solution of this invention, by acquiring the risk point of the gear clutch during engine start-stop and shutdown, and outputting a gear clutch protection strategy based on the risk point, can effectively solve the problem of gear clutch burning in vehicles equipped with hydraulic-mechanical automatic transmissions during engine start-stop and shutdown due to vehicle system failure causing the engine to fail to stop, thereby improving the reliability and safety of the gear clutch. In addition, the technical solution of this invention only requires improving the control strategies of the engine control unit and the automatic transmission control unit, without adding or changing the hardware structure. This method is simple, practical, highly feasible, and low in cost.

[0057] Based on the above embodiments, Figure 3 This is a flowchart of a second gear clutch protection method provided according to an embodiment of the present invention, combined with... Figure 2 and Figure 3 As shown, the method includes:

[0058] S20. When the automatic transmission control unit detects that the signals of the vehicle system meet the requirements for the first engine stop-start, the automatic transmission control unit sends a stop enable signal to the engine control unit. After receiving the stop enable signal, the engine control unit further determines whether the current driving state of the vehicle meets the requirements for the second engine stop-start.

[0059] The automatic transmission control unit (ATU) can monitor the vehicle's gear position, speed, brake pedal status, transmission fluid temperature, shift lever position, and transmission malfunctions in real time. When all conditions meet the vehicle's start-stop requirements (i.e., the first start-stop requirement is met), the ATU sends a stop enable signal to the engine control unit (ECU). The ECU also constantly monitors the vehicle's speed, shift lever position, brake pedal status, and road gradient. After receiving the stop enable signal from the ATU, it further determines whether the engine start-stop conditions are met based on its own monitoring signals (i.e., whether the second start-stop requirement is met).

[0060] S21. If so, the engine control unit sends a stop request signal to the automatic transmission control unit. After receiving the stop request signal from the engine control unit, the automatic transmission control unit further determines whether the vehicle is currently in the process of shifting gears.

[0061] Specifically, when the engine control unit receives a stop enable signal from the automatic transmission control unit and determines that the vehicle start-stop conditions are met based on its own monitoring signals, the engine control unit sends a stop request signal to the automatic transmission control unit. After receiving the stop request signal, the automatic transmission control unit further determines whether the vehicle is in the process of shifting gears.

[0062] S22. If the vehicle is not in the process of shifting gears, the automatic transmission control unit sends a stop permission signal to the engine control unit.

[0063] When the automatic transmission control unit determines that the vehicle is not in the process of shifting gears, it sends a stop permission signal to the engine control unit, indicating that the engine can now enter the start-stop process.

[0064] Under normal start-stop conditions, when the engine control unit determines that the stop conditions are not met and the engine needs to be started based on its own monitoring signals, it will no longer send a stop request signal to the automatic transmission control unit. At this time, the engine starts the start-up process and the engine speed begins to rise. When the engine speed is higher than a certain value, the automatic transmission control unit will no longer send a stop permission signal and will simultaneously control the electric pump to shut down. The oil pressure of the first gear clutch will be provided by the mechanical pump of the hydraulic-mechanical automatic transmission and gradually rise. Subsequently, the automatic transmission control unit will detect that the signal conditions no longer meet the engine start-stop requirements and will stop sending stop enable signals.

[0065] S23. The automatic transmission control unit sends a stop permission signal to the engine control unit, which then controls the engine to enter the start-stop process.

[0066] S24, Automatic transmission control unit obtains gear clutch risk points.

[0067] S25, The automatic transmission control unit outputs a gear clutch protection strategy based on the risk points of the gear clutch.

[0068] The technical solution of this invention, through the monitoring of vehicle start-stop conditions and vehicle system faults by the automatic transmission control unit and engine control unit, can accurately determine the timing of entering the engine start-stop process and the occurrence of gear clutch risk points, ensuring the timely activation of the gear clutch protection strategy.

[0069] Based on the above embodiments, Figure 4 This is a flowchart of the third gear clutch protection method provided by the embodiments of the present invention, combined with... Figure 2 and Figure 4 As shown, the method includes:

[0070] S30: The automatic transmission control unit sends a stop permission signal to the engine control unit, which then controls the engine to enter the start-stop process.

[0071] S31. The automatic transmission control unit acquires vehicle system fault signals and / or abnormal engine speed fault signals from the vehicle system.

[0072] Among them, vehicle system fault signals may include crankshaft position sensor fault signals, which may cause the engine to fail to stop after entering the start-stop process, thus leading to gear clutch burning; abnormal engine speed fault signals may be caused by the engine speed not dropping to 0 within a certain period of time after entering the engine start-stop process, leading to gear clutch burning.

[0073] Specifically, the engine control unit (ECU) can constantly monitor faults in the vehicle system that affect engine start-stop and shutdown, and send vehicle system fault signals to the automatic transmission control unit (ATU); the ATU can monitor and determine abnormal engine speed fault signals. After obtaining vehicle system fault signals and / or abnormal engine speed fault signals, the ATU identifies the gear clutch risk point.

[0074] S32, The automatic transmission control unit outputs a gear clutch protection strategy based on the risk points of the gear clutch.

[0075] The technical solution of this invention identifies gear clutch risk points by acquiring vehicle system fault signals and / or abnormal engine speed fault signals in the vehicle system. This allows the gear clutch risk points to be monitored in both the engine control unit and the automatic transmission control unit, providing dual redundancy protection. This effectively avoids the risk of gear clutch burning and improves the safety of the gear clutch.

[0076] Based on the above embodiments, Figure 5 This is a flowchart of the fourth gear clutch protection method provided by the embodiments of the present invention, combined with... Figure 2 and Figure 5 As shown, the method includes:

[0077] S40: The automatic transmission control unit sends a stop permission signal to the engine control unit, which then controls the engine to enter the start-stop process.

[0078] S41, Automatic transmission control unit obtains gear clutch risk points.

[0079] S42, The automatic transmission control unit outputs a command to shut down the electric pump in order to control the gear clutch oil pressure to drop to 0.

[0080] Specifically, when the automatic transmission control unit detects a risk point in the gear clutch, it outputs a command to shut down the electric pump, causing the oil pressure in the gear clutch to drop to zero, thereby preventing the gear clutch from burning out. It is understood that when the automatic transmission control unit does not detect a risk point in the gear clutch, it does not output a command to shut down the electric pump, but instead outputs a command to open the electric pump, keeping the electric pump in the open state. The technical solution of this embodiment of the invention, by identifying risk points in the gear clutch and controlling the electric pump, can ensure the safety of the gear clutch in a timely and effective manner.

[0081] Based on the above embodiments, Figure 6 This is a flowchart of the fifth gear clutch protection method provided by the embodiments of the present invention, combined with... Figure 2 and Figure 6 As shown, the method includes:

[0082] S50: The automatic transmission control unit sends a stop permission signal to the engine control unit, which then controls the engine to enter the start-stop process.

[0083] S51. The engine control unit constantly monitors the current vehicle system for any faults that could affect the engine's start-stop function.

[0084] The engine control unit constantly monitors whether there are any faults in the current vehicle system that affect the engine's start-stop function, such as a crankshaft position sensor malfunction, which can lead to gear clutch burning. In this embodiment of the invention, only a crankshaft position sensor malfunction is used as an example. Faults that affect the engine's start-stop function can be set according to the vehicle's own situation, and this embodiment of the invention does not limit this.

[0085] S52. If so, the engine control unit sends a vehicle system fault signal to the automatic transmission control unit.

[0086] Specifically, when the engine control unit detects a fault in the current vehicle system that affects engine start-stop, it sends a vehicle system fault signal to the automatic transmission control unit. Upon receiving the vehicle system fault signal, the automatic transmission control unit identifies it as a risk point of the gear clutch.

[0087] S53, the automatic transmission control unit outputs a gear clutch protection strategy based on the risk points of the gear clutch.

[0088] The technical solution of this invention, by identifying vehicle system faults affecting engine start-stop operation and activating the gear clutch protection strategy, can avoid the problem of the first gear clutch of the hydraulic-mechanical automatic transmission being burned due to the inability to stop the engine caused by vehicle system faults, thus ensuring the safety of the gear clutch in a timely and effective manner.

[0089] Based on the above embodiments, Figure 7 This is a flowchart of the sixth gear clutch protection method provided by the embodiments of the present invention, combined with... Figure 2 and Figure 7 As shown, the method includes:

[0090] S60: The automatic transmission control unit sends a stop permission signal to the engine control unit, which then controls the engine to enter the start-stop process.

[0091] S61. The automatic transmission control unit obtains the initial time t0 when the engine enters the start-stop process and the stop time threshold t.

[0092] When the engine enters the start-stop process, the automatic transmission control unit immediately acquires the initial time t0 of the start-stop process. The stop time threshold t is the time threshold after the engine enters the start-stop process, which can be calibrated and set in the automatic transmission control unit in combination with the durability bench test results of the gear clutch. The durability bench test of the gear clutch is a test result obtained during the development of the hydraulic mechanical automatic transmission on a durability test bench to verify its safety and reliability under different torque, different speed and different slip time conditions.

[0093] S62, The automatic transmission control unit obtains the engine speed at time t0+t.

[0094] S63, The automatic transmission control unit determines whether the engine speed is 0.

[0095] In this embodiment, if the engine speed drops to 0 after the engine enters the start-stop process and the shutdown time threshold t has elapsed, then there is no risk of gear clutch burning. If the engine speed has not dropped to 0 after the engine enters the start-stop process and the shutdown time threshold t has elapsed, then it indicates that the engine speed is abnormal and there is a risk of gear clutch burning. Therefore, this embodiment of the invention uses the engine speed at time t0+t to determine the risk point of the gear clutch.

[0096] S64. If not, the automatic transmission control unit determines that the engine speed is abnormal and generates an engine speed abnormality fault signal.

[0097] Specifically, if the engine speed has not dropped to 0 at time t0+t, the automatic transmission control unit determines that the gear clutch is at risk of burning and generates an abnormal engine speed fault signal.

[0098] S65, The automatic transmission control unit outputs a gear clutch protection strategy based on the risk points of the gear clutch.

[0099] The technical solution of this invention identifies the engine speed after the engine enters the start-stop process and the stop time threshold has elapsed. This identifies the risk point of the gear clutch and activates the gear clutch protection strategy. This can avoid the problem of the first gear clutch of the hydraulic mechanical automatic transmission burning out due to the engine speed not dropping to 0 for a long time, and ensure the safety of the gear clutch in a timely and effective manner.

[0100] Based on the above embodiments, Figure 8 This is a flowchart of the seventh gear clutch protection method provided by the embodiments of the present invention, combined with... Figure 2 and Figure 8 As shown, the method includes:

[0101] S70, the automatic transmission control unit controls the gear clutch oil pressure to begin decreasing.

[0102] Specifically, the automatic transmission control unit sends a stop permission signal to the engine control unit, and then the engine control unit controls the engine to enter the start-stop process. The automatic transmission control unit controls the oil pressure of the first gear clutch to drop to the target oil pressure, which is the oil pressure that can be maintained after the electric pump is turned on, and is a relatively low oil pressure value.

[0103] S71. When the gear clutch oil pressure drops to the target oil pressure, the automatic transmission control unit controls the electric pump to start and maintain the gear clutch oil pressure at the target oil pressure.

[0104] When the oil pressure of the first gear clutch drops to the target oil pressure, the automatic transmission control unit controls the electric pump to start, maintaining the oil pressure of the first gear clutch at the target oil pressure value. This target oil pressure value depends on the capacity of the electric pump and is not adjustable, in order to ensure the vehicle's rapid start-up performance after the engine starts and stops.

[0105] S72, Automatic transmission control unit obtains gear clutch risk points.

[0106] S73, the automatic transmission control unit outputs a gear clutch protection strategy based on the risk points of the gear clutch.

[0107] The technical solution of this invention, by acquiring the risk points of the gear clutch during engine start-stop and shutdown, and outputting a gear clutch protection strategy based on these risk points, can effectively solve the problem of gear clutch burning in vehicles equipped with hydraulic-mechanical automatic transmissions during engine start-stop and shutdown due to vehicle system failures causing the engine to fail to stop. This improves the reliability and safety of the gear clutch. Furthermore, the technical solution of this invention only requires improving the control strategies of the engine control unit and the automatic transmission control unit, without adding or changing the hardware structure. This method is simple, practical, highly feasible, and low-cost.

[0108] Based on the above embodiments, Figure 9 This is a flowchart of the eighth gear clutch protection method provided by the embodiments of the present invention, combined with... Figure 2 and Figure 9 As shown, the method includes:

[0109] S80: The automatic transmission control unit sends a stop permission signal to the engine control unit, which then controls the engine to enter the start-stop process.

[0110] S81, The automatic transmission control unit did not detect the gear clutch risk point.

[0111] S82, The automatic transmission control unit outputs an electric pump start command to maintain the gear clutch oil pressure until the automatic transmission control unit no longer sends a stop permission signal.

[0112] Understandably, when the automatic transmission control unit does not detect a risk point in the gear clutch, it will not output a command to shut down the electric pump, but will still output a command to start the electric pump. The electric pump will remain on to maintain the gear clutch oil pressure until the automatic transmission control unit stops sending a stop permission signal.

[0113] S83, Automatic transmission control unit obtains gear clutch risk points.

[0114] S84, The automatic transmission control unit outputs a gear clutch protection strategy based on the risk points of the gear clutch.

[0115] The technical solution of this invention does not output a gear clutch protection strategy when it is identified that there is no risk of gear clutch burning, thus taking into account both the safety of the gear clutch and the rapid start-up performance requirements when the vehicle starts and stops.

[0116] Based on the same inventive concept, embodiments of the present invention also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a gear clutch protection method.

[0117] The number of processors in a computer device can be one or more; the memory, processor, and computer programs stored in the memory and capable of running on the processor in the computer device can be connected by a bus or other means.

[0118] Memory, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the gear clutch protection method in this embodiment of the invention. The processor executes various functional applications and data processing of the computer device by running the computer program stored in the memory, thereby implementing the gear clutch protection method.

[0119] The memory may primarily comprise a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a given function; the data storage area may store data created based on terminal usage. Furthermore, the memory may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory, or other non-volatile solid-state storage device. In some instances, the memory may further include memory remotely located relative to the processor, which can be connected to the computer device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0120] Based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a gear clutch protection method.

[0121] Of course, the computer-readable storage medium provided in the embodiments of the present invention has computer-executable instructions that are not limited to the method operations described above, but can also perform related operations in the gear clutch protection method provided in any embodiment of the present invention.

[0122] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0123] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0124] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for protecting a gear clutch, characterized in that, include: The automatic transmission control unit sends a stop permission signal to the engine control unit, which then controls the engine to enter a start-stop process. The automatic transmission control unit acquires the risk points of the gear clutch; The automatic transmission control unit outputs a gear clutch protection strategy based on the gear clutch risk point; The automatic transmission control unit obtains the following risk points related to the gear clutch: The automatic transmission control unit acquires vehicle system fault signals and / or abnormal engine speed fault signals from the vehicle system. The automatic transmission control unit acquires vehicle system fault signals from the vehicle system, including: The engine control unit constantly monitors whether there are any faults in the current vehicle system that affect the engine's start-stop function; If so, the engine control unit sends a vehicle system fault signal to the automatic transmission control unit.

2. The gear clutch protection method according to claim 1, characterized in that, The automatic transmission control unit sends a stop permission signal to the engine control unit, which, before controlling the engine to enter the start-stop process, includes: When the automatic transmission control unit detects that the signals of the vehicle system meet the requirements for the first engine start-stop, the automatic transmission control unit sends a stop enable signal to the engine control unit. After receiving the stop enable signal, the engine control unit further determines whether the current driving state of the vehicle meets the requirements for the second engine start-stop. If so, the engine control unit sends a stop request signal to the automatic transmission control unit. After receiving the stop request signal from the engine control unit, the automatic transmission control unit further determines whether the vehicle is currently in the process of shifting gears. If the vehicle is not in the process of shifting gears, the automatic transmission control unit sends a stop permission signal to the engine control unit.

3. The gear clutch protection method according to claim 1, characterized in that, The automatic transmission control unit outputs a gear clutch protection strategy based on the gear clutch risk point, including: The automatic transmission control unit outputs a command to shut down the electric pump in order to control the gear clutch oil pressure to drop to 0.

4. The gear clutch protection method according to claim 1, characterized in that, The automatic transmission control unit acquires abnormal engine speed fault signals from the vehicle system, including: The automatic transmission control unit acquires the initial time t0 when the engine enters the start-stop process and the shutdown time threshold t; The automatic transmission control unit acquires the engine speed at time t0+t; The automatic transmission control unit determines whether the engine speed is 0; If not, the automatic transmission control unit determines that the engine speed is abnormal and generates an engine speed abnormality fault signal.

5. The gear clutch protection method according to claim 1, characterized in that, The automatic transmission control unit sends a stop permission signal to the engine control unit, which then controls the engine to enter the start-stop process, including: The automatic transmission control unit controls the gear clutch oil pressure to begin decreasing; When the gear clutch oil pressure drops to the target oil pressure, the automatic transmission control unit controls the electric pump to start, maintaining the gear clutch oil pressure at the target oil pressure.

6. The gear clutch protection method according to claim 1, characterized in that, After the automatic transmission control unit sends a stop permission signal to the engine control unit, and the engine control unit controls the engine to enter the start-stop process, the following steps are also included: The automatic transmission control unit did not detect the gear clutch risk point; The automatic transmission control unit outputs an electric pump start command to maintain the gear clutch oil pressure until the automatic transmission control unit no longer sends a stop permission signal.

7. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method as described in any one of claims 1-6.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1-6.

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