Method and system for processing abnormal knocking sound fault of vehicle transmission system, vehicle, equipment and medium

Abstract

The embodiment of the invention provides a vehicle transmission system knocking abnormal sound fault processing method and system, a vehicle, equipment and a medium, and belongs to the field of commercial vehicles. The method comprises the steps that the vehicle running speed and the clutch pedal depth are monitored; when the running speed is lower than the preset vehicle speed, if the depth of a clutch pedal is smaller than a preset threshold value, the eddy current retarder is controlled to work according to the retarder handle gear of a driver; otherwise, according to the total time when the clutch pedal is treaded to the bottom, the eddy current retarder is controlled to output different damping torques so as to restrain oscillation of the transmission system, and otherwise, the eddy current retarder is controlled to work according to the gear of the retarder handle of the driver. Through recognition of vehicle running working conditions and problem working conditions and matching of the working mechanism of the eddy current retarder and the abnormal sound problem mechanism, on the premise of not increasing the product manufacturing cost, the working characteristics of the eddy current retarder are fully utilized, rapid attenuation of bidirectional oscillation energy of a commercial vehicle transmission system is achieved, and the knocking abnormal sound fault is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of commercial vehicles, in particular to a vehicle transmission system knocking abnormal noise fault processing method, system, vehicle, equipment and medium. BACKGROUND

[0002] In the field of commercial vehicles, the electric eddy current retarder is widely used in light and medium commercial vehicles as an auxiliary braking device due to its low cost and simple structure. The core structure of the electric eddy current retarder includes a stator coil, a rotor and an electronic control unit. By adjusting the current of the coil, the size of the reverse torque opposite to the driving shaft can be controlled, which can significantly reduce the risk of thermal decay of the friction brake and is an effective way to optimize the problem of brake overheating.

[0003] However, in actual engineering application, the electric eddy current retarder has a problem of insufficient matching between the electric eddy current retarder and the dynamic working condition of the vehicle transmission system. Traditional control strategies rely on signals such as vehicle speed, gear position, brake pedal, etc., and do not fully consider the transient impact problem caused by the large moment of inertia of the electric eddy current retarder rotor, especially in the operating condition of the clutch in the half-clutch state. In some working conditions, the sudden change of the transmission system torque causes impact vibration between the electric eddy current retarder rotor, the transmission, the transmission shaft and the drive axle, i.e. the "knocking abnormal noise" fault. Especially, the large moment of inertia of the electric eddy current retarder rotor causes abnormal wear of the transmission shaft and deterioration of the NVH performance, which seriously affects the vehicle ride comfort, and the problem is more serious in uphill driving conditions.

[0004] Therefore, under the premise of controlling costs, there is an urgent need for an efficient and reliable transmission system knocking abnormal noise fault processing method to solve the "knocking abnormal noise" fault caused by the electric eddy current retarder rotor. SUMMARY

[0005] The purpose of the embodiments of the present application is to provide a vehicle transmission system knocking abnormal noise fault processing method, system, vehicle, equipment and medium. By identifying the vehicle driving condition and the problem condition, matching the working mechanism of the electric eddy current retarder with the abnormal noise problem mechanism, and completing the calibration method of the electric eddy current retarder working mode and the vehicle driving condition without increasing the product manufacturing cost, the working characteristics of the electric eddy current retarder are fully utilized, the vehicle ride comfort and economy are considered, the bidirectional oscillation energy of the commercial vehicle transmission system is quickly attenuated, and the transmission system knocking abnormal noise fault in specific conditions is solved.

[0006] In order to achieve the above-mentioned purpose, the embodiments of the present application provide a vehicle transmission system knocking abnormal noise fault processing method, the transmission system includes an engine and a transmission connected by a clutch, an electric eddy current retarder installed at the output end of the transmission, and a transmission shaft connecting the transmission and the drive axle, the electric eddy current retarder includes a rotor and a plurality of stator coils, and the processing method comprises: monitoring a vehicle speed and a clutch pedal depth; when the vehicle speed is lower than a preset vehicle speed, executing an abnormal sound suppression control strategy, otherwise controlling the electric eddy current brake to work according to a driver retarder handle gear position; wherein the abnormal sound suppression control strategy comprises: if the clutch pedal depth is less than a preset threshold, controlling the electric eddy current brake to work according to the driver retarder handle gear position; if the clutch pedal depth is greater than or equal to the preset threshold, predicting a total time of the clutch pedal being stepped to the bottom according to a speed of stepping the clutch pedal, and controlling the electric eddy current brake to output different sizes of damping torque according to a length of the total time, so as to suppress the transmission system oscillation.

[0007] Optionally, the control of the electric eddy current brake to output different sizes of damping torque is realized by controlling different numbers of stator coils to be electrified.

[0008] Optionally, the shorter the total time is, the more the numbers of the stator coils to be electrified are.

[0009] Optionally, the control of the electric eddy current brake to output different sizes of damping torque according to the length of the total time, so as to suppress the transmission system oscillation, comprises: if the total time is less than a first preset time length, controlling all the stator coils to be electrified; if the total time is greater than or equal to the first preset time length and less than a second preset time length, controlling a first number of stator coils to be electrified; if the total time is greater than or equal to the second preset time length and less than a third preset time length, controlling a second number of stator coils to be electrified, wherein the second number is less than the first number; if the total time is greater than or equal to the third preset time length, controlling the electric eddy current brake to work according to the driver retarder handle gear position; wherein the first preset time length is less than the second preset time length which is less than the third preset time length.

[0010] Optionally, when the vehicle is in a clutch full linkage state and the vehicle speed is lower than the preset vehicle speed, the second number of stator coils is controlled to be electrified.

[0011] Optionally, the electric eddy current brake is provided with six stator coils, the first number is four, and the second number is two, wherein the stator coils to be electrified are randomly selected.

[0012] In a second aspect, the application further provides an electric eddy current brake control system, comprising: a vehicle speed sensor for monitoring a vehicle speed; Clutch state sensor, used for monitoring the clutch pedal depth and action speed; The control unit is electrically connected with the vehicle speed sensor, the clutch state sensor and the electric eddy current brake, and is configured to execute the processing method of the knocking abnormal sound fault of the vehicle transmission system.

[0013] In a third aspect, the present application also provides a commercial vehicle comprising a vehicle transmission system or an electric eddy current brake control system.

[0014] In a fourth aspect, the present application also provides an electronic device, which includes a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the processing method of the knocking abnormal sound fault of the vehicle transmission system when executing the program.

[0015] In a fifth aspect, the present application also provides a storage medium, which stores a computer program, and the computer program implements the steps of the processing method of the knocking abnormal sound fault of the vehicle transmission system when executed by a processor.

[0016] Through the above technical solution, through the identification of the vehicle driving condition and the problem condition, and the matching of the electric eddy current brake working mechanism and the abnormal sound problem mechanism, the calibration method of the electric eddy current brake working mode and the vehicle driving condition is completed without increasing the product manufacturing cost, the working characteristics of the electric eddy current brake are fully utilized, the two-way oscillation energy of the commercial vehicle transmission system is quickly attenuated under the premise of considering the vehicle smoothness and economy, and the knocking abnormal sound fault of the transmission system in a specific condition is solved.

[0017] Other features and advantages of the embodiments of the present application will be described in detail in the following specific implementation part. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the embodiments of the present application together with the following specific implementation, but do not constitute a limitation to the embodiments of the present application. In the drawings: Figure 1 is a flow chart of a processing method of a knocking abnormal sound fault of a vehicle transmission system provided by the embodiments of the present application; Figure 2 is a structural schematic diagram of a transmission system provided by the embodiments of the present application; Figure 3 is a structural side view schematic diagram of an electric eddy current brake provided by the embodiments of the present application.

[0019] Figure 4 is a detailed implementation flow chart of a processing method of a knocking abnormal sound fault of a vehicle transmission system provided by the embodiments of the present application; Figure 5 is a structural schematic diagram of an electric eddy current retarder control system provided by an embodiment of the present application; Figure 6 is a hardware structural schematic diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0020] Various embodiments of the present disclosure will be described in detail below with reference to the drawings. The present disclosure can have various embodiments, and adjustments and changes can be made therein. However, it should be understood that there is no intention to limit various embodiments of the present disclosure to the specific embodiments disclosed herein, but the present disclosure should be understood to encompass all adjustments, equivalents and / or alternatives falling within the spirit and scope of various embodiments of the present disclosure.

[0021] Hereinafter, the term "include" or "may include" used in various embodiments of the present disclosure indicates the presence of the disclosed functions or operations, and does not limit the addition of one or more functions or operations. In addition, as used in various embodiments of the present disclosure, the terms "include", "have" and their synonyms are only intended to mean the presence of a specific feature, number, step, operation or combination of the foregoing, and should not be understood as first excluding the presence or addition of one or more other features, numbers, steps, operations or combinations of the foregoing.

[0022] In various embodiments of the present disclosure, the expression "or" or "at least one of A or / and B" includes any combination of the listed terms or all combinations thereof. For example, the expression "A or B" or "at least one of A or / and B" can include A, can include B, or can include both A and B.

[0023] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0024] When the clutch pedal is operated, the power between the gearbox and the engine is interrupted, and the drive axle is converted from the driving mode to the reverse towing mode. The gear shaft system composed of the gearbox, the transmission shaft and the drive axle has a transient impact. Since the electric eddy current retarder rotor with large rotational inertia is installed on the output / input flange of the gearbox / transmission shaft, the transient impact energy is large and difficult to quickly decay, and thus the transmission system is violently oscillated to cause knocking noise failure. Referring to Figure 1The figure shows a flow chart of a method for processing a knocking abnormality of a vehicle transmission system in an embodiment, the transmission system comprising an engine and a gearbox connected by a clutch, an electric eddy current brake installed at an output end of the gearbox, and a transmission shaft connecting the gearbox and a drive axle, the electric eddy current brake comprising a rotor and a plurality of stator coils, refer to Figure 2 The figure shows a structural schematic diagram of a transmission system provided by an embodiment of the application, comprising an engine 1, a clutch 2, a gearbox 3, an electric eddy current brake 4, a transmission shaft 5, and a drive axle 6, the engine 1 being fixed to the vehicle, the clutch 2 connecting the engine 1 and the gearbox 3, the gearbox 3 being fixed to the vehicle, the electric eddy current brake 4 being installed on the gearbox 3, the transmission shaft 5 linking the gearbox 3 and the drive axle 6, both ends of the transmission shaft 5 being respectively provided with universal joints, and the drive axle 6 being fixed to the vehicle; refer to Figure 3 The figure shows that the electric eddy current brake 4 comprises an electric eddy current brake rotor 401 and electric eddy current brake stator 402 coils, the electric eddy current brake rotor 401 being fixed to an output of the gearbox 3, and the electric eddy current brake stator 402 coils being six in number and being fixedly installed in the electric eddy current brake rotor 401.

[0025] Specifically, the processing method comprises the following execution steps: Step 100: monitoring a vehicle speed and a clutch pedal depth.

[0026] Specifically, a linear displacement sensor or an angle displacement sensor installed on a clutch pedal arm is used to measure a linear moving distance of the pedal and a rotation angle of the pedal around a fulcrum, so as to convert a physical displacement amount of the pedal into a linear electrical signal, the electrical signal being 0% when the pedal is completely released and 100% when the pedal is completely depressed to the bottom. Vehicle speed data provided by an engine control unit is directly read through an OBD-II diagnostic interface located below a driver seat of the vehicle, or real-time speed and position of the vehicle are calculated through satellite signals by using a GPS speed sensor. A multi-channel data acquisition instrument is used to ensure that data of all channels have the same time stamp.

[0027] Step 101: when the vehicle speed is lower than a preset vehicle speed, executing an abnormality suppression control strategy, otherwise controlling the electric eddy current brake according to a driver brake handle gear position.

[0028] Since the transmission system itself cannot quickly attenuate oscillation caused by a large-inertia rotor when semi-engagement, a reverse damping torque is generated by using the electric eddy current brake itself to actively “cancel” the oscillation. The abnormality suppression control strategy is divided into the following two cases. Case 1: if the clutch pedal depth is less than a preset threshold, controlling the electric eddy current brake according to a driver brake handle gear position.

[0029] For example, if the clutch pedal depth is less than 60%, the electric eddy current retarder is controlled according to the driver's retarder handle gear position.

[0030] Case 2: If the clutch pedal depth is greater than or equal to a preset threshold, the total time for the clutch pedal to be depressed to the bottom is predicted according to the speed at which the clutch pedal is depressed, and different sizes of damping torque are output by the electric eddy current retarder according to the length of the total time to suppress transmission system oscillation.

[0031] By utilizing the electric eddy current retarder itself, an adjustable reverse damping torque is output according to the predicted impact severity (total time length) to directly counter and quickly attenuate the bidirectional torsional oscillation of the transmission system caused by the power interruption of the clutch and the large inertia of the retarder rotor, solving the limitation of traditional solutions that can only suppress unidirectional impact. Moreover, an accurate mapping relationship between impact severity (total time) and damping torque size is established. In severe impact (short total time), large damping is provided to quickly dampen; in moderate impact (long total time), small damping is provided, avoiding knocking noise and ensuring smooth and comfortable driving, achieving an optimal solution for double goals.

[0032] It should be noted that the control of the electric eddy current retarder to output different sizes of damping torque is achieved by controlling the energization of different numbers of stator coils. The shorter the total time, the more stator coils are controlled to be energized.

[0033] The faster it is depressed - the more sudden the power interruption - the greater the impact - the stronger the damping (more stator coils are turned on, such as 6). The slower it is depressed - the more gradual the power interruption - the smaller the impact - the weaker the damping (fewer stator coils are turned on, such as 2 or 4), to balance smoothness.

[0034] In a specific embodiment, controlling the electric eddy current retarder to output different sizes of damping torque to suppress transmission system oscillation according to the length of the total time includes the following four cases: Case 1: If the total time is less than a first preset time length, all stator coils are controlled to be energized.

[0035] Case 2: If the total time is greater than or equal to the first preset time length and less than a second preset time length, a first number of stator coils are controlled to be energized.

[0036] Case 3: If the total time is greater than or equal to the second preset time length and less than a third preset time length, a second number of stator coils are controlled to be energized, wherein the second number is less than the first number.

[0037] Case 4: If the total time is greater than or equal to the third preset time length, the electric eddy current retarder is controlled according to the driver's retarder handle gear position.

[0038] The first preset time length is less than the second preset time length, and the second preset time length is less than the third preset time length.

[0039] In some embodiments, when the vehicle is in a full engagement state of the clutch and the vehicle speed is lower than the preset vehicle speed, the second number of stator coils is controlled to be energized.

[0040] By effectively suppressing the violent impact oscillation, the dynamic alternating load borne by the key transmission components such as the gearbox, the transmission shaft and the drive axle is significantly reduced, the abnormal wear of the gears, bearings and other parts is reduced from the source, and the service life of the entire transmission system is prolonged.

[0041] For example, it is determined whether the vehicle speed reaches 15 km / h before the knocking abnormal sound occurs. If the vehicle speed is higher than 15 km / h, the electric eddy current retarder is controlled according to the retarder handle gear position of the driver, and other control strategies do not intervene. If the vehicle speed is lower than 15 km / h, it is further determined whether the clutch pedal depth is less than 60%. If the clutch pedal depth is less than 60%, the electric eddy current retarder is controlled according to the retarder handle gear position of the driver, and other control strategies do not intervene. If the clutch pedal depth is greater than 60%, it is further determined whether the total time of the clutch pedal to the bottom is less than 0.4 seconds. If the total time of the clutch pedal to the bottom is less than 0.4 seconds, the six electric eddy current retarder stators of the electric eddy current retarder are controlled to be energized to provide the maximum reverse oscillation torque to limit the violent oscillation of the transmission shaft and the electric eddy current retarder rotor, so as to avoid causing the knocking abnormal sound failure. If the total time of the clutch pedal to the bottom is greater than or equal to 0.4 seconds and less than 0.9 seconds, the four electric eddy current retarder stators of the electric eddy current retarder are controlled to be randomly energized to provide the matched reverse oscillation torque to limit the oscillation of the transmission shaft and the electric eddy current retarder rotor, so as to avoid causing the knocking abnormal sound failure and take into account the smoothness of the vehicle. If the total time of the clutch pedal to the bottom is greater than or equal to 0.9 seconds and less than 2 seconds, the two electric eddy current retarder stators of the electric eddy current retarder are controlled to be randomly energized to provide the smaller reverse oscillation torque to limit the oscillation of the transmission shaft and the electric eddy current retarder rotor, so as to avoid causing the knocking abnormal sound failure and take into account the smoothness of the vehicle. If the total time of the clutch pedal to the bottom is greater than or equal to 2 seconds, the electric eddy current retarder will not cause the obvious knocking problem of the transmission system, and the electric eddy current retarder is controlled according to the retarder handle gear position of the driver, and other control strategies do not intervene.

[0042] By using two clear and measurable key parameters, vehicle speed < 15 km / h and clutch pedal depth > 60%, the specific working condition of low speed and heavy load semi-linkage which is most likely to cause knocking noise is accurately locked. This makes the intervention timing extremely accurate, avoids false operation in conditions that do not need intervention, and ensures that the original intention of the driver is not affected. Moreover, a multi-level and quantitative damping torque control strategy is established (such as 0.4 seconds / 6 coils, 0.9 seconds / 4 coils, 2 seconds / 2 coils). This strategy ensures that the reverse oscillation torque applied is strictly positively correlated with the predicted impact energy. In the case of severe impact (fast pedal), maximum damping is provided to ensure absolutely reliable noise suppression; in the case of moderate impact (slow pedal), moderate damping is provided to eliminate noise while maximizing vehicle smoothness, solving the problem of smoothness degradation caused by the one-size-fits-all approach of traditional solutions.

[0043] In a specific embodiment, when the vehicle clutch 2 is in full linkage state and the vehicle speed is higher than the preset speed, the electric eddy current retarder 4 is not working normally, and its working gear is controlled by the retarder gear handle in the cab. When the vehicle clutch 2 is in full linkage state and the vehicle speed is lower than the preset speed, the two coils of the electric eddy current retarder stator 402 are energized.

[0044] Further, when the vehicle clutch 2 is in semi-linkage state and the vehicle speed is lower than the preset speed, the working state of the electric eddy current retarder 4 is determined according to the pedal position change percentage signal of the clutch 2. When it is determined that the time for stepping on the clutch pedal to the bottom is less than the fastest time threshold and the clutch pedal depth is greater than the set threshold, the six coils of the electric eddy current retarder stator 402 are energized. When the vehicle clutch 2 is in semi-linkage state and the vehicle speed is lower than the preset speed, the working state of the electric eddy current retarder 4 is determined according to the pedal position change percentage signal of the clutch 2. When it is determined that the time for stepping on the clutch pedal to the bottom is greater than the fastest time threshold and less than the medium time threshold, and the clutch pedal depth is greater than the set threshold, the four coils of the electric eddy current retarder stator 402 are energized. When the vehicle clutch 2 is in semi-linkage state and the vehicle speed is lower than the preset speed, the working state of the electric eddy current retarder 4 is determined according to the pedal position change percentage signal of the clutch 2. When it is determined that the time for stepping on the clutch pedal to the bottom is greater than the medium time threshold and less than the slowest time threshold, and the clutch pedal depth is greater than the set threshold, the two coils of the electric eddy current retarder stator 402 are energized. When the vehicle clutch 2 is in semi-linkage state and the vehicle speed is lower than the preset speed, the working state of the electric eddy current retarder 4 is determined according to the pedal position change percentage signal of the clutch 2. When it is determined that the time for stepping on the clutch pedal to the bottom is greater than the slowest time threshold, the electric eddy current retarder 4 is controlled according to the retarder gear handle gear in the cab.

[0045] It should be noted that the slowest time threshold, the medium time threshold, and the fastest time threshold can be set according to specific application scenarios, for example, the slowest time threshold is 0.4 seconds, the medium time threshold is 0.9 seconds, and the fastest time threshold is 2 seconds, which are not limited herein.

[0046] Referring to Figure 4 As shown in the detailed implementation flowchart of the method for processing the knocking abnormal noise fault of the vehicle transmission system provided by the embodiment of the present application, the method comprises the following process: during operation, when the clutch 2 pedal is actuated, the power between the gearbox 3 and the engine 1 is interrupted, thereby causing the drive axle 6 to be converted from the driving mode to the reverse towing mode, and the gear shaft system composed of the gearbox 3, the transmission shaft 5, and the drive axle 6 exists transient impact. Since the electric eddy current retarder rotor 401 with large rotational inertia is installed on the output flange of the gearbox 3 and the input flange of the transmission shaft 5, the transient impact energy is large and difficult to quickly attenuate, thereby causing the transmission system to violently oscillate and cause the knocking abnormal noise fault. The method of the present application determines whether the vehicle speed reaches the preset vehicle speed before the knocking abnormal noise occurs. If the vehicle speed is higher than the preset vehicle speed, the electric eddy current retarder 4 is controlled to work according to the driver's retarder handle gear position, and other control strategies do not intervene. If the vehicle speed is lower than the preset vehicle speed, the clutch 2 pedal depth is further determined. If the clutch 2 pedal depth is less than the set threshold, the electric eddy current retarder 4 is controlled to work according to the driver's retarder handle gear position, and other retarder control strategies do not intervene. If the clutch 2 pedal depth is greater than the set threshold, the total time for the clutch pedal to be depressed to the bottom is further predicted according to the clutch pedal depression speed. If the total time for the clutch pedal to be depressed to the bottom is less than the fastest time threshold, the six electric eddy current retarder stators 401 of the electric eddy current retarder 4 are controlled to be powered on to work, providing the maximum reverse oscillation torque to limit the violent oscillation of the transmission shaft 5 and the electric eddy current retarder rotor 402, thereby avoiding causing the knocking abnormal noise fault. If the total time for the clutch pedal to be depressed to the bottom is greater than the fastest time threshold and less than the medium time threshold, the four electric eddy current retarder stators 401 of the electric eddy current retarder 4 are controlled to be powered on to work at random, providing the matched reverse oscillation torque to limit the oscillation of the transmission shaft 5 and the electric eddy current retarder rotor 402, thereby avoiding causing the knocking abnormal noise fault and taking into account the vehicle smoothness. If the total time for the clutch pedal to be depressed to the bottom is greater than the medium time threshold and less than the slowest time threshold, the two electric eddy current retarder stators 401 of the electric eddy current retarder 4 are controlled to be powered on to work at random, providing the smaller reverse oscillation torque to limit the oscillation of the transmission shaft 5 and the electric eddy current retarder rotor 402, thereby avoiding causing the knocking abnormal noise fault and taking into account the vehicle smoothness. If the total time for the clutch pedal to be depressed to the bottom is greater than the slowest time threshold, the transmission system will not cause obvious knocking problems. The electric eddy current retarder 4 is controlled to work according to the driver's retarder handle gear position, and other control strategies do not intervene.

[0047] In the prior art, the output rotor is usually installed with a torque damping coupling, which can reduce the impact of torque and thus reduce the impact of the power chain downstream of the retarder. Another technical solution controls the operation of the retarder through the determination of the clutch pedal opening signal, and the retarder simulates the engine's counter-towing force to alleviate the wideband knocking noise caused by the repeated impact of the gear after the clutch is depressed and the engine counter-towing torque disappears. The existing solution only considers the gear knocking problem caused by the opening and closing of the clutch, and simulates the engine's counter-towing force through the retarder to suppress one-way impact, without considering the knocking problem caused by the large moment of inertia of the transmission system and the two-way impact force buffering problem. Moreover, the traditional retarder operation requires an active cooling system, which will have a certain impact on the energy consumption of the vehicle, especially in slow crawl conditions. In the present embodiment, through the identification of vehicle driving conditions and problem conditions, the matching of the working mechanism of the electric eddy current retarder and the abnormal noise problem mechanism, the calibration method of the electric eddy current retarder working mode and the vehicle driving condition is completed without increasing the product manufacturing cost. Under the premise of taking into account the vehicle ride comfort and economy, the rapid decay of the bidirectional oscillation energy of the commercial vehicle transmission system is realized, and the transmission system knocking and abnormal noise fault in specific conditions is solved.

[0048] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0049] As Figure 5 shown, the following is an embodiment of an electric eddy current retarder control system provided by the present disclosure.

[0050] The electric eddy current retarder control system comprises: a vehicle speed sensor for monitoring the vehicle driving speed; a clutch state sensor for monitoring the clutch pedal depth and action speed; a control unit electrically connected with the vehicle speed sensor, clutch state sensor and electric eddy current retarder, and configured to execute Figure 1 the vehicle transmission system knocking and abnormal noise fault processing method.

[0051] On the other hand, the present application also provides a commercial vehicle comprising a vehicle transmission system or an electric eddy current retarder control system.

[0052] Figure 6 is a hardware structure schematic diagram of an electronic device for implementing various embodiments of the present application.

[0053] The vehicle transmission system knocking abnormal noise fault processing method provided by the embodiments of the present application can be applied to an electronic device. Those skilled in the art can understand that the electronic device structure involved in the embodiments of the present application does not constitute a limitation on the electronic device, and the electronic device can include more or fewer components than the illustration, or combine certain components, or different component arrangements. In the embodiments of the present application, the electronic device includes but is not limited to a laptop computer, a desktop computer, a workstation, a personal digital assistant, a server, a blade server, a mainframe computer, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the embodiments of the present application described and / or claimed herein.

[0054] The electronic device can include a processor, an external memory interface, an internal memory, a universal serial bus (USB) interface, a charge management module, a power management module, a battery, a wireless communication module, an audio module, a speaker, a microphone, a sensor module, a key, a camera, a display screen, and a SIM card interface, etc.

[0055] It can be understood that the structure illustrated by the embodiments of the present application does not constitute a specific limitation on the electronic device. In other embodiments of the present application, the electronic device can include more or fewer components than the illustration, or combine certain components, or split certain components, or different component arrangements. The illustrated components can be implemented in hardware, software, or a combination of software and hardware.

[0056] The processor can include one or more processing units, such as: the processor can include a central processing unit (CPU), an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Among them, different processing units can be independent devices, or can be integrated in one or more processors.

[0057] The processor can be the nerve center and command center of the electronic device. The controller can generate operation control signals according to instruction operation codes and timing signals, and complete the control of fetching and executing instructions.

[0058] The processor can also be provided with a memory for storing instructions and data. In some embodiments, the memory in the processor is a cache memory. The memory can save instructions or data that the processor has just used or repeatedly uses. If the processor needs to use the instructions or data again, it can be directly called from the memory. This avoids repeated access and reduces the waiting time of the processor, thereby improving system efficiency.

[0059] The external memory interface can be used to connect an external memory card, such as a MicroSD card, to expand the storage capacity of the electronic device. The external memory card communicates with the processor through the external memory interface to realize data storage functions. For example, music, video, and other files are saved in the external memory card.

[0060] The internal memory can be used to store computer executable program codes, which include instructions. The processor executes various functional applications and data processing of the electronic device by running the instructions stored in the internal memory. The internal memory can include a program storage area and a data storage area. The internal memory can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash storage (UFS), etc.

[0061] The wireless communication function of the electronic device can be realized through an antenna, a wireless communication module, a modem processor, a baseband processor, etc.

[0062] The wireless communication module can provide a wireless communication solution including wireless local area network (WLAN) (such as a wireless fidelity (Wi-Fi) network), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared technology (IR), etc. applied to the electronic device.

[0063] The electronic device can realize audio functions, etc. through an audio module, a speaker, a receiver, a microphone, an earphone interface, and an application processor, etc.

[0064] The electronic device can implement the photographing function through an ISP, a camera, a video codec, a GPU, a display screen, and an application processor.

[0065] The electronic device can implement the display function through a GPU, a display screen, and an application processor.

[0066] The GPU is a microprocessor for image processing, connected to the display screen and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor can include one or more GPUs that execute program instructions to generate or change display information.

[0067] The display screen is used to display images, videos, and the like. The display screen includes a display panel.

[0068] In the storage medium provided in the present application, a program product capable of implementing the processing method of the knocking abnormal sound fault of the vehicle transmission system is stored.

[0069] The processing method of the knocking abnormal sound fault of the vehicle transmission system includes that the transmission system includes an engine and a gearbox connected through a clutch, an electric eddy current retarder installed at an output end of the gearbox, and a transmission shaft connecting the gearbox and a drive axle, the electric eddy current retarder includes a rotor and a plurality of stator coils, and the processing method includes monitoring a vehicle speed and a clutch pedal depth; when the vehicle speed is lower than a preset vehicle speed, an abnormal sound suppression control strategy is executed, otherwise the electric eddy current retarder is controlled to work according to a driver's retarder handle gear position, wherein the abnormal sound suppression control strategy includes that if the clutch pedal depth is less than a preset threshold, the electric eddy current retarder is controlled to work according to the driver's retarder handle gear position, and if the clutch pedal depth is greater than or equal to the preset threshold, the total time for stepping on the clutch pedal to the bottom is predicted according to the speed of stepping on the clutch pedal, and different sizes of damping torques are output by the electric eddy current retarder according to the length of the total time to suppress the transmission system oscillation.

[0070] In some possible implementation manners, the processing method and system of the knocking abnormal sound fault of the vehicle transmission system provided in the present disclosure can be implemented in the form of a program product, which includes program codes for causing terminal equipment to execute the steps described in the above “exemplary method” section of the present specification according to various exemplary embodiments of the present disclosure when the program product is run on the terminal equipment.

[0071] The storage medium of the present disclosure can employ any combination of one or more computer-readable media. The computer-readable media can be a computer- readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include the following: an electrical connection having one or more wires, a portable disc, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0072] The foregoing description of the disclosed embodiments enables a person skilled in the art to implement or use the invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the invention. Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for processing a knocking abnormality of a vehicle transmission system, the transmission system comprising an engine and a transmission connected by a clutch, an electric eddy current retarder installed at an output end of the transmission, and a propeller shaft connecting the transmission and a drive axle, the electric eddy current retarder comprising a rotor and a plurality of stator coils, the method comprising: The processing method includes: ​ Monitor vehicle speed and clutch pedal depth; When the vehicle speed is lower than the preset speed, the abnormal noise suppression control strategy is executed; otherwise, the eddy current retarder is controlled to work according to the driver's retarder lever position. The abnormal noise suppression control strategy includes: If the clutch pedal depth is less than a preset threshold, the electric eddy current retarder is controlled to work according to the driver's retarder handle position. If the clutch pedal depth is greater than or equal to a preset threshold, the total time for the clutch pedal to be fully depressed is predicted based on the speed at which the clutch pedal is depressed, and the eddy current retarder is controlled to output different magnitudes of damping torque according to the length of the total time to suppress transmission system oscillation.

2. The method of claim 1, wherein: The control eddy current retarder outputs different magnitudes of damping torque by controlling the energization of different numbers of stator coils.

3. The method of claim 2, wherein the method further comprises: The shorter the total time, the more stator coils are controlled to be energized.

4. The method of claim 3, wherein the method further comprises: Depending on the total duration, the eddy current retarder outputs different magnitudes of damping torque to suppress transmission system oscillations, including: If the total time is less than the first preset duration, then all stator coils are energized. If the total time is greater than or equal to the first preset duration and less than the second preset duration, then control the first number of stator coils to be energized; If the total time is greater than or equal to the second preset duration and less than the third preset duration, then control the second number of stator coils to be energized, wherein the second number is less than the first number; If the total time is greater than or equal to the third preset duration, the electric eddy current retarder is controlled to work according to the driver's retarder handle position. Wherein, the first preset duration is less than the second preset duration and less than the third preset duration.

5. The method for handling knocking noise faults in a vehicle transmission system according to claim 4, wherein when the vehicle is in a fully engaged clutch state and the vehicle speed is lower than the preset speed, the second number of stator coils are energized.

6. The method of claim 5, wherein the method further comprises: The eddy current retarder has 6 stator coils, with 4 in the first case and 2 in the second case, wherein the energized stator coils are randomly selected.

7. An eddy current brake control system characterized by, include: Vehicle speed sensor, used to monitor vehicle speed; Clutch status sensor is used to monitor clutch pedal depth and actuation speed; The control unit is electrically connected to the vehicle speed sensor, clutch status sensor and eddy current retarder, and is configured to perform a method for handling knocking noise faults in the vehicle transmission system as described in any one of claims 1 to 6.

8. A commercial vehicle characterized by, It includes the vehicle drive system as described in claim 1 or the eddy current retarder control system as described in claim 7.

9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method for handling knocking noise faults in the vehicle transmission system as described in any one of claims 1 to 6.

10. A storage medium having stored thereon a computer program, characterized in that When the computer program is executed by the processor, it implements the steps of the method for handling knocking noise faults in the vehicle transmission system as described in any one of claims 1 to 6.

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