Automatic transmission electromagnetic valve power-on self-test control method and control system

Abstract

The application relates to a full-automatic gearbox electromagnetic valve power-on self-checking control method and a control system, which utilizes a gearbox controller to control the detection capability of an electromagnetic valve port under the premise that an engine is not started, carries out grouped detection on clutch electromagnetic valves (proportional electromagnetic valves) according to gearbox shifting logic under the premise that abnormal faults of a direction clutch or a gear clutch are not triggered, improves the detection efficiency while guaranteeing the detection effect, and achieves the best effect of proportional electromagnetic valve fault detection. In addition, when power is turned on, the working mode of a switching electromagnetic valve is set and fault detection is carried out on the switching electromagnetic valve after the fault of the switching electromagnetic valve is read, so that the fault can be accurately positioned, the problems of the introduction of other fault points in the electromagnetic valve fault detection process and the false alarm of a fault diagnosis system caused by the simultaneous detection of the electromagnetic valves are solved, and the best effect of the fault detection of different electromagnetic valves before normal shifting operation is achieved under the premise of safety.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery transmission technology, and in particular to a method, control system, and engineering machinery for controlling the power-on self-test of the solenoid valve of a fully automatic transmission. Background Technology

[0002] Currently, automatic transmissions are widely used. They work by the transmission controller recognizing the driver's intentions (lever position, gear selection, vehicle speed, etc.) and directly controlling the corresponding solenoid valves to automatically switch between different planetary gears, thus changing the gear ratio and achieving automatic shifting. The normal shifting of the transmission is closely related to the working state of the solenoid valves. If a solenoid valve malfunctions and is not detected or confirmed in time, it will affect the normal shifting of the entire control system. The solenoid valves controlled by the automatic transmission control system include switching solenoid valves and proportional solenoid valves. The methods and timing for detecting faults in these two types of solenoid valves differ. Ensuring timely detection of faults in both types of solenoid valves to prevent shifting failures and safety accidents after engine start-up is a key focus and challenge.

[0003] Existing technical solutions fall into two categories. The first involves adding peripheral detection circuitry to the solenoid valve to detect the physical characteristics (voltage, current) at fixed measuring points to determine related faults. The second involves starting the engine and triggering a corresponding detection program using specialized diagnostic instruments to detect faults in the solenoid valve by measuring relevant pressure boundaries. While these existing technologies solve the problem of solenoid valve fault detection, they add corresponding detection circuitry, increasing costs and introducing potential fault points and risks. Furthermore, they fail to consider the potential for false alarms in the control system caused by simultaneously detecting different types of solenoid valves. Locating the fault after starting the engine also increases safety risks. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a power-on self-test control method and control system for fully automatic transmission solenoid valves. This solves the problems of introducing other fault points and false alarms in the fault diagnosis system caused by simultaneous detection of solenoid valves during the fault detection process in existing technologies. It achieves the best effect of detecting different solenoid valve faults before normal gear shifting operations while ensuring safety.

[0005] In a first aspect, the present invention provides a method for power-on self-test control of the solenoid valve of a fully automatic transmission.

[0006] The power-on self-test control method for the solenoid valves of fully automatic transmissions includes:

[0007] Step a: Determine whether the system allows entering the self-test state. If allowed, proceed to steps b and c; if not allowed, proceed to step d.

[0008] Step b: Determine whether the system allows the proportional solenoid valve to enter the self-test state. If it allows, execute the proportional solenoid valve self-test subroutine and then execute step d; if it does not allow, execute step d.

[0009] Step c: Determine whether the system allows entering the solenoid valve self-test state. If allowed, execute the solenoid valve self-test subroutine and then execute step d; if not allowed, execute step d.

[0010] Step d: Determine whether the system is allowed to enter the normal control state. If allowed, execute the normal control program; if not allowed, execute the real-time monitoring program for the overall system status. Repeat step d until the system executes the normal control program.

[0011] Optionally, the conditions for determining whether the system is allowed to enter the self-test state are met simultaneously: no speed sensor fault, no pump wheel speed sensor fault, engine not started, output speed sensor signal is 0, and pump wheel output sensor signal is 0.

[0012] Optionally, the fault information in these conditions is obtained from the fault information saved when the power was last turned off, while other overall machine status information is obtained in real time by the transmission controller.

[0013] Optionally, the proportional solenoid valve self-test subroutine includes:

[0014] The proportional solenoid valves are grouped, and non-operating mode fault detection and operating mode fault detection are performed on each group.

[0015] In response to the self-test request of the proportional solenoid valve, the current group of proportional solenoid valves is controlled to enter the non-working mode. If the current group of proportional solenoid valves has a non-working mode fault, the fault diagnosis module is entered, and the working mode fault detection of the current group of proportional solenoid valves is skipped, and the non-working mode fault detection of the next group of proportional solenoid valves is performed. If the current group of proportional solenoid valves does not have a non-working mode fault, the working mode fault detection of the current group of proportional solenoid valves is entered.

[0016] The proportional solenoid valve self-test subroutine ends when all groups of proportional solenoid valves have completed non-operating mode fault detection and operating mode fault detection.

[0017] Optionally, the proportional solenoid valve includes multiple proportional solenoid valves for controlling the engagement or disengagement of the gear position clutch and multiple proportional solenoid valves for controlling the engagement or disengagement of the directional clutch. When these proportional solenoid valves are grouped, no group may include all proportional solenoid valves for controlling the engagement or disengagement of the gear position clutch and no group may include all proportional solenoid valves for controlling the engagement or disengagement of the directional clutch.

[0018] Optionally, the proportional solenoid valve's operating mode fault detection includes: controlling the current group of proportional solenoid valves to enter the operating mode and start timing; determining whether the operating time of the current group of proportional solenoid valves has reached the set value; if it has not reached the set value, determining in real time whether the current group of proportional solenoid valves has a fault in the operating mode; if a fault exists in the operating mode, entering the fault diagnosis module, and simultaneously entering the non-operating mode fault detection of the next group of proportional solenoid valves; if the operating time of the current group of proportional solenoid valves reaches the set value without an operating mode fault, entering the non-operating mode fault detection of the next group of proportional solenoid valves.

[0019] Optionally, the self-test subroutine for switching the solenoid valve includes:

[0020] In response to the self-test request of the switching solenoid valve, control the current switching solenoid valve to enter the working mode and start timing;

[0021] Determine whether the current operating time of the solenoid valve has reached the set value. If it has not reached the set value, determine whether the current solenoid valve is faulty in real time. If a fault exists, enter the fault diagnosis module and simultaneously enter the operating mode fault detection of the next solenoid valve. If the current operating time of the solenoid valve reaches the set value without operating mode fault, enter the operating mode fault detection of the next solenoid valve.

[0022] The self-test subroutine for the solenoid valves ends when all solenoid valves have completed their working mode fault detection.

[0023] Secondly, the present invention also provides a power-on self-test control system for a fully automatic transmission solenoid valve.

[0024] The fully automatic transmission solenoid valve power-on self-test control system includes a transmission controller for implementing any of the control methods described above. The transmission controller has a fault storage and retrieval module and a solenoid valve fault judgment module. Each proportional solenoid valve and each switching solenoid valve signal is connected to the transmission controller. The vehicle display is connected to the transmission controller via a CAN bus. The vehicle display is used to display current fault information, historical fault information, and the number of faults.

[0025] Thirdly, the present invention also provides engineering machinery.

[0026] Construction machinery, including the aforementioned fully automatic transmission solenoid valve power-on self-test control system.

[0027] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: The power-on self-test control method and control system of the fully automatic transmission solenoid valve provided by the present invention solves the problems of the introduction of other fault points and the false alarm of the fault diagnosis system caused by the simultaneous detection of solenoid valves in the fault detection process of the prior art, and achieves the best effect of detecting different solenoid valve faults before normal shifting operation while ensuring safety. Attached Figure Description

[0028] Figure 1 This is a flowchart of the control method in Embodiment 1 of the present invention;

[0029] Figure 2 This is a flowchart of the self-test subroutine of the proportional solenoid valve in Embodiment 1 of the present invention;

[0030] Figure 3 This is a flowchart of the self-test subroutine for the switching solenoid valve in Embodiment 1 of the present invention;

[0031] Figure 4 This is a schematic diagram of the control system in Embodiment 2 of the present invention. Detailed Implementation

[0032] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of the present invention, including various details to aid understanding. These details should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0033] Example 1

[0034] A method for power-on self-test control of a solenoid valve in a fully automatic transmission includes:

[0035] Step a: Determine whether the system allows entering the self-test state. If allowed, proceed to steps b and c; if not allowed, proceed to step d.

[0036] Step b: Determine whether the system allows the proportional solenoid valve to enter the self-test state. If it allows, execute the proportional solenoid valve self-test subroutine and then execute step d; if it does not allow, execute step d.

[0037] Step c: Determine whether the system allows entering the solenoid valve self-test state. If allowed, execute the solenoid valve self-test subroutine and then execute step d; if not allowed, execute step d.

[0038] Step d: Determine whether the system is allowed to enter the normal control state. If allowed, execute the normal control program; if not allowed, execute the real-time monitoring program for the overall system status. Repeat step d until the system executes the normal control program.

[0039] The conditions for determining whether the system is allowed to enter self-test mode are met simultaneously: no speed sensor fault, no pump wheel speed sensor fault, engine not started, output speed sensor signal is 0, and pump wheel output sensor signal is 0. The fault information in these conditions is obtained from the fault information saved at the last power-off. Other overall machine status information is obtained in real time by the transmission controller. The fault information also includes faults in the switching solenoid valve and the proportional solenoid valve.

[0040] The proportional solenoid valve self-test subroutine includes:

[0041] The proportional solenoid valves are grouped, and non-operating mode fault detection and operating mode fault detection are performed on each group.

[0042] In response to the self-test request of the proportional solenoid valve, the current group of proportional solenoid valves is controlled to enter the non-working mode. If the current group of proportional solenoid valves has a non-working mode fault, the fault diagnosis module is entered, and the working mode fault detection of the current group of proportional solenoid valves is skipped, and the non-working mode fault detection of the next group of proportional solenoid valves is performed. If the current group of proportional solenoid valves does not have a non-working mode fault, the working mode fault detection of the current group of proportional solenoid valves is entered.

[0043] The proportional solenoid valve self-test subroutine ends when all groups of proportional solenoid valves have completed non-operating mode fault detection and operating mode fault detection.

[0044] The aforementioned proportional solenoid valves include multiple proportional solenoid valves for controlling the engagement or disengagement of gear position clutches and multiple proportional solenoid valves for controlling the engagement or disengagement of directional clutches. When these proportional solenoid valves are grouped, no group shall include all proportional solenoid valves for controlling the engagement or disengagement of gear position clutches, nor shall any group include all proportional solenoid valves for controlling the engagement or disengagement of directional clutches.

[0045] The fault detection of the operating mode of the proportional solenoid valve includes: controlling the current group of proportional solenoid valves to enter the operating mode and start timing; determining whether the operating time of the current group of proportional solenoid valves has reached the set value; if it has not reached the set value, determining in real time whether the current group of proportional solenoid valves has a fault in the operating mode; if a fault exists in the operating mode, entering the fault diagnosis module, and simultaneously entering the non-operating mode fault detection of the next group of proportional solenoid valves; if the operating time of the current group of proportional solenoid valves reaches the set value without a fault in the operating mode, entering the non-operating mode fault detection of the next group of proportional solenoid valves.

[0046] The self-test subroutine for the solenoid valve includes:

[0047] In response to the self-test request of the switching solenoid valve, control the current switching solenoid valve to enter the working mode and start timing;

[0048] Determine whether the current operating time of the solenoid valve has reached the set value. If it has not reached the set value, determine whether the current solenoid valve is faulty in real time. If a fault exists, enter the fault diagnosis module and simultaneously enter the operating mode fault detection of the next solenoid valve. If the current operating time of the solenoid valve reaches the set value without operating mode fault, enter the operating mode fault detection of the next solenoid valve.

[0049] The self-test subroutine for the solenoid valves ends when all solenoid valves have completed their working mode fault detection.

[0050] like Figure 1 , 2 As shown in Figure 3, a detailed explanation is provided using a gearbox comprising six clutches forming six forward gears and two reverse gears. This includes three directional clutches: C1, C2, and C3; and three gear position clutches: C4, C5, and C6. Specifically, C2 and C6 engage to achieve first gear; C3 and C6 engage to achieve second gear; C2 and C5 engage to achieve third gear; C3 and C5 engage to achieve fourth gear; C2 and C4 engage to achieve fifth gear; C3 and C4 engage to achieve sixth gear; C1 and C6 engage to achieve first gear; and C1 and C5 engage to achieve second gear. During normal gear shifting, the three directional clutches or the three gear position clutches must not engage simultaneously. If simultaneous engagement is detected, the fault diagnosis system will set a corresponding fault and provide a corresponding response. Therefore, the simultaneous engagement of the directional clutches or the gear position clutches should be avoided during the solenoid valve's power-on self-test. During the power-on self-test of the proportional solenoid valves, according to the gearbox shifting logic, and ensuring that the simultaneous engagement of the steering clutch or gear clutch is not triggered, the proportional solenoid valves are tested in groups: C1 and C6 in one group, C2 and C5 in another, and C3 and C4 in yet another. This improves testing efficiency and shortens self-test time. Of course, other forms of grouping can be used in other embodiments. There are two switching solenoid valves: switching solenoid valve 1 and switching solenoid valve 2.

[0051] After the transmission controller is powered on, it first reads the fault information saved when it was powered off last time. The fault information saved when powered off includes output speed sensor fault, pump wheel speed sensor fault, switching solenoid valve fault, and proportional solenoid valve fault.

[0052] After the previous power-down fault reading is completed, the system checks whether the overall machine status allows for power-on self-test. The overall machine status checked includes engine status, output speed sensor signal, and pump wheel speed sensor signal. If there is no speed sensor fault, no pump wheel speed sensor fault, the engine is not started, the output speed sensor signal is 0, or the pump wheel output sensor signal is 0, then the solenoid valve power-on self-test is allowed. If any of the above conditions are not met, the system proceeds to determine whether to allow entry into the normal control program.

[0053] After the solenoid valve enters the power-on self-test, it determines whether the proportional solenoid valve self-test is allowed. If the application layer program is set to disable this function, it then determines whether to allow entry into the normal control program; otherwise, it enters the proportional solenoid valve power-on self-test subroutine.

[0054] After the solenoid valve enters the power-on self-test, it determines whether the solenoid valve self-test is allowed. If the application layer program is set to disable this function or the fault read from the last power-down does not include a solenoid valve fault, it then determines whether the normal control program is allowed. Otherwise, it enters the proportional solenoid valve power-on self-test subroutine.

[0055] The system determines whether to allow entry into the normal control program by checking the position of the physical handle and the program running time after power-on. If the handle is in neutral and the program running time is longer than the set value, the system enters the normal control program and performs the corresponding gear shifting operation. Otherwise, the system monitors the overall status of the machine in real time until the requirements for executing the normal control program are met.

[0056] After entering the proportional solenoid valve self-test subroutine, the transmission controller controls the proportional solenoid valve port to enter the non-operating mode (i.e., sets the requested current of the proportional solenoid valve to 0mA), mainly to detect open circuit and short circuit to ground faults in the proportional solenoid valve. First, it determines whether the C1 and C6 proportional solenoid valves have a non-operating mode fault. If so, it enters the fault diagnosis module, sets the fault accordingly, and skips the self-test of the operating mode of the C1 and C6 proportional solenoid valves, directly entering the detection of non-operating mode faults of the C2 and C5 solenoid valves. Otherwise, it enters the fault detection of the C1 and C6 operating modes.

[0057] The transmission controller puts the C1 and C6 proportional solenoid valve ports into operating mode (i.e., sets the requested current of the proportional solenoid valves to be greater than 0mA) and starts a self-test timing, mainly detecting short circuits and abnormal current faults in the proportional solenoid valves. It checks whether the operating time of the C1 and C6 proportional solenoid valves has reached the set value. If not, it checks in real time whether the C1 and C6 proportional solenoid valves have faults in their operating mode. If a fault exists, it enters the fault diagnosis module, sets the fault accordingly, and directly proceeds to the detection of non-operating mode faults in the C2 and C5 proportional solenoid valves. Otherwise, if the C1 and C6 proportional solenoid valves do not have operating mode faults and the set operating time is reached, it can also proceed to the detection of non-operating mode faults in the C2 and C5 proportional solenoid valves.

[0058] After entering the fault detection of non-operating mode of proportional solenoid valves C2 and C5, it is determined whether there is a fault in non-operating mode of proportional solenoid valves C2 and C5. If there is, the fault diagnosis module is entered, the fault is set accordingly, and the self-test of operating mode of proportional solenoid valves C2 and C5 is skipped and the detection of non-operating mode fault of proportional solenoid valves C3 and C4 is directly entered. Otherwise, the fault detection of operating mode of proportional solenoid valves C2 and C5 is entered.

[0059] The transmission controller puts the C2 and C5 proportional solenoid valve ports into operating mode (i.e., sets the requested current of the proportional solenoid valve to be greater than 0mA) and starts a self-test timer, mainly detecting short circuits and abnormal current faults in the proportional solenoid valves. It checks whether the operating time of the C2 and C5 proportional solenoid valves has reached the set value. If not, it checks in real time whether the C2 and C5 proportional solenoid valves have faults in their operating mode. If a fault exists, it enters the fault diagnosis module, sets the fault accordingly, and directly proceeds to the detection of non-operating mode faults in the C3 and C4 proportional solenoid valves. Otherwise, if the C2 and C5 proportional solenoid valves do not have operating mode faults and the set operating time is reached, it can also proceed to the detection of non-operating mode faults in the C3 and C4 proportional solenoid valves.

[0060] After entering the fault detection of non-operating mode of proportional solenoid valves C3 and C4, it is determined whether there is a fault in non-operating mode of proportional solenoid valves C3 and C4. If there is, the fault diagnosis module is entered, the fault is set accordingly, and the self-test of operating mode of proportional solenoid valves C3 and C4 is skipped, and the self-test subroutine of proportional solenoid valves is directly entered into the termination module. Otherwise, the fault detection of operating mode of proportional solenoid valves C3 and C4 is entered.

[0061] The transmission controller puts the C3 and C4 proportional solenoid valve ports into operating mode (i.e., sets the requested current of the proportional solenoid valve to be greater than 0mA) and starts a self-test timing, mainly detecting short circuits and abnormal current faults in the proportional solenoid valves. It checks whether the operating time of the C3 and C4 proportional solenoid valves has reached the set value. If not, it checks in real time whether the C3 and C4 proportional solenoid valves have faults in their operating mode. If a fault exists, it enters the fault diagnosis module, sets the fault accordingly, and directly enters the proportional solenoid valve self-test subroutine termination module. Otherwise, if the C2 and C5 proportional solenoid valves have no operating mode faults and the set operating time is reached, it can also enter the proportional solenoid valve self-test subroutine termination module to complete the power-on self-test of the proportional solenoid valves.

[0062] After entering the self-test subroutine of the solenoid valve, the transmission controller controls solenoid valve 1 to enter the working mode (i.e., set solenoid valve) and starts timing. It detects open-circuit and short-circuit faults in the solenoid valve through feedback current. It checks whether the working time of solenoid valve 1 has reached the set value. If not, it checks for faults in the solenoid valve in real time. If a fault is found, it enters the fault diagnosis module to adjust the fault settings accordingly, and simultaneously directly enters the fault detection for solenoid valve 2. Otherwise, if the set working time is reached without any faults in the working mode of solenoid valve 1, it can also enter the fault detection for solenoid valve 2.

[0063] After entering the fault detection phase of solenoid valve 2, the transmission controller controls the solenoid valve 2 port to enter the working mode (i.e., set the solenoid valve) and starts timing. It detects open-circuit and short-circuit faults in the solenoid valve through feedback current. It checks whether the working time of solenoid valve 2 has reached the set value. If not, it checks in real-time whether the solenoid valve is faulty. If a fault is found, it enters the fault diagnosis module to make corresponding settings for the fault, and simultaneously directly enters the solenoid valve self-test subroutine termination module. Otherwise, if the solenoid valve 2 reaches the set working time without any working mode fault, it can also enter the solenoid valve self-test subroutine termination module to complete the solenoid valve's power-on self-test.

[0064] Example 2

[0065] like Figure 4 As shown, a fully automatic transmission solenoid valve power-on self-test control system includes a transmission controller for implementing any of the control methods described above. The transmission controller has a fault storage and retrieval module and a solenoid valve fault judgment module. Each proportional solenoid valve and each switching solenoid valve signal is connected to the transmission controller. The vehicle display is connected to the transmission controller via a CAN bus. The vehicle display is used to display current fault information, historical fault information, and the number of faults.

[0066] Example 3

[0067] An engineering machine includes the aforementioned fully automatic transmission solenoid valve power-on self-test control system.

[0068] Compared with existing technologies, the fully automatic transmission solenoid valve power-on self-test control method and control system of the present invention solves the problems of the introduction of other fault points and the false alarms caused by simultaneous detection of solenoid valves in the solenoid valve fault detection process of the prior art. It achieves the best effect of detecting different solenoid valve faults before normal shifting operation while ensuring safety.

[0069] 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 occur depending on 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 power-on self-test control method for the solenoid valve of a fully automatic transmission, characterized in that, include: Step a: Determine whether the system allows entering the self-test state. If allowed, proceed to steps b and c; if not allowed, proceed to step d. Step b: Determine whether the system allows the proportional solenoid valve to enter the self-test state. If it allows, execute the proportional solenoid valve self-test subroutine and then execute step d; if it does not allow, execute step d. Step c: Determine whether the system allows entering the solenoid valve self-test state. If allowed, execute the solenoid valve self-test subroutine and then execute step d; if not allowed, execute step d. Step d: Determine whether the system is allowed to enter the normal control state. If allowed, execute the normal control procedure. If not allowed, execute the real-time monitoring program for the whole machine status, and repeat step d until the system executes the normal control program. The proportional solenoid valve self-test subroutine includes: The proportional solenoid valves are grouped, and non-operating mode fault detection and operating mode fault detection are performed on each group. In response to the self-test request of the proportional solenoid valve, the current group of proportional solenoid valves is controlled to enter the non-working mode. If the current group of proportional solenoid valves has a non-working mode fault, the fault diagnosis module is entered, and the working mode fault detection of the current group of proportional solenoid valves is skipped, and the non-working mode fault detection of the next group of proportional solenoid valves is performed. If the current group of proportional solenoid valves does not have a non-working mode fault, the working mode fault detection of the current group of proportional solenoid valves is entered. The proportional solenoid valve self-test subroutine ends when all groups of proportional solenoid valves have completed non-operating mode fault detection and operating mode fault detection. The proportional solenoid valve includes multiple proportional solenoid valves for controlling the engagement or disengagement of the gear clutch and multiple proportional solenoid valves for controlling the engagement or disengagement of the directional clutch. When these proportional solenoid valves are grouped, no group shall include all proportional solenoid valves for controlling the engagement or disengagement of the gear clutch and no group shall include all proportional solenoid valves for controlling the engagement or disengagement of the directional clutch.

2. The control method as described in claim 1, characterized in that, The conditions for determining whether the system is allowed to enter the self-test state are met simultaneously: no speed sensor fault, no pump wheel speed sensor fault, engine not started, output speed sensor signal is 0, and pump wheel output sensor signal is 0.

3. The control method as described in claim 2, characterized in that, The fault information in these conditions is obtained from the fault information saved when the power was last turned off, while other overall machine status information is obtained in real time by the transmission controller.

4. The control method as described in claim 1, characterized in that, The fault detection of the operating mode of the proportional solenoid valve includes: controlling the current group of proportional solenoid valves to enter the operating mode and start timing; determining whether the operating time of the current group of proportional solenoid valves has reached the set value; if it has not reached the set value, determining in real time whether the current group of proportional solenoid valves has a fault in the operating mode; if a fault exists in the operating mode, entering the fault diagnosis module, and simultaneously entering the non-operating mode fault detection of the next group of proportional solenoid valves; if the operating time of the current group of proportional solenoid valves reaches the set value without a fault in the operating mode, entering the non-operating mode fault detection of the next group of proportional solenoid valves.

5. The control method as described in claim 1, characterized in that, The self-test subroutine for the solenoid valve includes: In response to the self-test request of the switching solenoid valve, control the current switching solenoid valve to enter the working mode and start timing; Determine whether the current operating time of the solenoid valve has reached the set value. If it has not reached the set value, determine whether the current solenoid valve is faulty in real time. If a fault exists, enter the fault diagnosis module and simultaneously enter the operating mode fault detection of the next solenoid valve. If the current operating time of the solenoid valve reaches the set value without operating mode fault, enter the operating mode fault detection of the next solenoid valve. The self-test subroutine for the solenoid valves ends when all solenoid valves have completed their working mode fault detection.

6. A fully automatic transmission solenoid valve power-on self-test control system, characterized in that, The transmission controller includes a transmission controller for implementing the control method as described in any one of claims 1 to 5. The transmission controller has a fault storage and retrieval module and a solenoid valve fault judgment module. Each proportional solenoid valve and each switching solenoid valve is connected to the transmission controller via a CAN bus. The vehicle display is used to display current fault information, historical fault information, and the number of faults.

7. Construction machinery, characterized in that, This includes the fully automatic transmission solenoid valve power-on self-test control system as described in claim 6.

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