A control method for a p2 hybrid transmission wake-up flush valve

Abstract

This invention discloses a control method for waking up and flushing valves in a P2 hybrid transmission. The method includes: S1, the TCU (Transmission Control Unit) supports CAN wake-up and is woken up in advance; S2, the TCU receives and processes the input signal; S3, the TCU wakes up the electronic pump and establishes the main pressure of the transmission system; S4, the clutch pressure solenoid valve K1 and shift pressure solenoid valve PV2 undergo a first flush, and the clutch pressure solenoid valve K0 undergoes a flush; S5, the clutch pressure solenoid valve K2 and shift pressure solenoid valve PV1 undergo a first flush, and the clutch pressure solenoid valve K0 undergoes a flush; S6, the clutch pressure solenoid valve K1 and shift pressure solenoid valve PV2 undergo a second flush, and the clutch pressure solenoid valve K0 undergoes a flush. This invention can quickly flush all relevant solenoid valves once, and, given sufficient time, perform multiple flushes, ensuring the cleanliness of the solenoid valves and improving their responsiveness.

Description

Technical Field

[0001] This invention relates to the field of automotive transmission technology, and specifically to a control method for the wake-up valve of a P2 structure hybrid transmission. Background Technology

[0002] P2 hybrid transmissions are widely used in various vehicle models. With prolonged operation, debris and impurities accumulate in the transmission fluid. Furthermore, when hydraulic valve bodies are not used for extended periods, solenoid valve malfunctions may occur. Firstly, when stationary oil leaks through the valve gaps, deposits accumulate and do not dissipate, while air may remain, interfering with the normal operation of the solenoid valves. Secondly, when the control system requests solenoid valve activation, the prolonged inactivity can make it difficult for the spring force within the solenoid valve to push the valve core away from the stop end, allowing fluid to flow and causing the solenoid valve to jam. Therefore, after prolonged inactivity, the solenoid valve needs to be activated to flush out deposits and purge air from the transmission hydraulic system, ensuring the oil passages are filled. However, some deposits may remain in the solenoid valve gaps, requiring the solenoid valve to swing back and forth to move them. The control system should ensure that the solenoid valves are flushed and cleaned after prolonged periods of inactivity to improve transmission responsiveness. Summary of the Invention

[0003] The technical solutions to the above technical problems are as follows:

[0004] A control method for the wake-up valve of a P2 hybrid transmission includes the following steps:

[0005] S1, TCU supports CAN wake-up function and can be woken up in advance;

[0006] S2, the TCU receives and processes the input signal, and determines whether the conditions for entering the wake-up valve function are met based on the signal received by the TCU. If the conditions are met, then proceed to S3.

[0007] S3, TCU wakes up the electronic pump to establish the main pressure of the transmission system;

[0008] S4, the TCU controls the clutch pressure solenoid valve K1 and the shift pressure solenoid valve PV2 to perform the first flush, the TCU controls the clutch pressure solenoid valve K0 to flush, and at the same time the TCU monitors the valve flushing termination conditions. When the termination conditions are met, the valve flushing function is immediately exited.

[0009] S5, the TCU controls the clutch pressure solenoid valve K2 and the shift pressure solenoid valve PV1 to perform the first flush, the TCU controls the clutch pressure solenoid valve K0 to flush, and at the same time the TCU monitors the valve flushing termination conditions. When the termination conditions are met, the valve flushing function is immediately exited.

[0010] S6, the TCU controls the clutch pressure solenoid valve K1 and the shift pressure solenoid valve PV2 to perform a second flush, the TCU controls the clutch pressure solenoid valve K0 to flush, and at the same time the TCU monitors the valve flushing termination conditions. When the termination conditions are met, the valve flushing function is immediately exited.

[0011] S7, the TCU controls the clutch pressure solenoid valve K2 and the shift pressure solenoid valve PV1 to perform a second flush, the TCU controls the clutch pressure solenoid valve K0 to flush, and at the same time the TCU monitors the valve flushing termination conditions. When the termination conditions are met, the valve flushing function is immediately exited.

[0012] Furthermore, S1 includes the TCU monitoring the vehicle's CAN signal. When the driver unlocks the door with the key, indicating the intention to drive, the TCU receives an activation signal sent by the vehicle's CAN and is woken up in advance to enter the working mode.

[0013] Furthermore, S2 specifically includes:

[0014] S2.1, KL15 power-on signal detection for the entire vehicle;

[0015] S2.2, Vehicle charging status signal detection;

[0016] S2.3, Power source speed, input shaft speed, and vehicle speed signal detection;

[0017] S2.4, Transmission main pressure signal detection;

[0018] S2.5, Clutch K0 pressure signal detection.

[0019] Furthermore, the clutch pressure solenoid valve K1 and shift pressure solenoid valve PV2 of S4 and S6 perform the same first flushing and second flushing methods; the clutch pressure solenoid valve K2 and shift pressure solenoid valve PV1 of S5 and S7 perform the same first flushing and second flushing methods; the flushing method of clutch pressure solenoid valve K0 is independent.

[0020] This invention provides a control method for waking up and washing the solenoid valves in a P2 hybrid transmission. First, the solenoid valves are flushed before the driver starts the vehicle, effectively preventing solenoid valve jamming caused by prolonged parking. Second, signals such as the power source speed, vehicle speed, input shaft speed, vehicle KL15 power-on signal, and vehicle charging status are used as judgment conditions. Simultaneously, the solenoid valves are grouped during flushing, comprehensively ensuring the safety of the entire vehicle during valve washing. This invention's control method for waking up and washing the solenoid valves in a P2 hybrid transmission can quickly flush all critical solenoid valves in one flush, and, if time permits, perform multiple flushes, ensuring the cleanliness of the solenoid valves, improving their responsiveness, and facilitating routine transmission maintenance. Attached Figure Description

[0021] Figure 1 A flowchart of the control method for the wake-up washing valve of the P2 structure hybrid transmission of the present invention. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1 As shown, a control method for the wake-up valve of a P2 hybrid transmission includes the following steps:

[0024] S1, the TCU supports CAN wake-up function and is woken up in advance. The TCU is the transmission controller.

[0025] S2, the TCU receives and processes the input signal, and determines whether the conditions for entering the wake-up valve function are met based on the signal received by the TCU. If the conditions are met, then proceed to S3.

[0026] S3, TCU wakes up the electronic pump to establish the main pressure of the transmission system;

[0027] S4, the TCU controls the clutch pressure solenoid valve K1 and the shift pressure solenoid valve PV2 to perform the first flush, the TCU controls the clutch pressure solenoid valve K0 to flush, and at the same time the TCU monitors the valve flushing termination conditions. When the termination conditions are met, the valve flushing function is immediately exited.

[0028] S5, the TCU controls the clutch pressure solenoid valve K2 and the shift pressure solenoid valve PV1 to perform the first flush, the TCU controls the clutch pressure solenoid valve K0 to flush, and at the same time the TCU monitors the valve flushing termination conditions. When the termination conditions are met, the valve flushing function is immediately exited.

[0029] S6, the TCU controls the clutch pressure solenoid valve K1 and the shift pressure solenoid valve PV2 to perform a second flush, the TCU controls the clutch pressure solenoid valve K0 to flush, and at the same time the TCU monitors the valve flushing termination conditions. When the termination conditions are met, the valve flushing function is immediately exited.

[0030] S7, the TCU controls the clutch pressure solenoid valve K2 and the shift pressure solenoid valve PV1 to perform a second flush, the TCU controls the clutch pressure solenoid valve K0 to flush, and at the same time the TCU monitors the valve flushing termination conditions. When the termination conditions are met, the valve flushing function is immediately exited.

[0031] Preferably, S1 includes the TCU monitoring the vehicle's CAN signal. When the driver unlocks the door with the key, indicating the intention to drive, the TCU receives an activation signal sent by the vehicle's CAN and is woken up in advance to enter the working mode.

[0032] Preferably, the input signal in S2 includes:

[0033] S2.1, KL15 power-on signal detection for the entire vehicle;

[0034] S2.2, Vehicle charging status signal detection;

[0035] S2.3, Power source speed, input shaft speed, and vehicle speed signal detection;

[0036] S2.4, Transmission main pressure signal detection;

[0037] S2.5, Clutch K0 pressure signal detection.

[0038] Preferably, the clutch pressure solenoid valve K1 and shift pressure solenoid valve PV2 of S4 and S6 perform the same first flushing and second flushing methods; the clutch pressure solenoid valve K2 and shift pressure solenoid valve PV1 of S5 and S7 perform the same first flushing and second flushing methods; and the clutch pressure solenoid valve K0 performs an independent flushing method.

[0039] In this implementation scheme, step S2 needs to determine whether the conditions for entering the wake-up wash valve function are met according to the following criteria:

[0040] 1. KL15 power-on signal detection for the whole vehicle. KL15 is the hard-wired wake-up signal for the whole vehicle, indicating that the driver has started the engine and is ready to drive. The operation of the valve washing function takes a certain amount of time. The whole vehicle needs to prioritize the driver's intention and respond to the driver's intention first. Therefore, in order to improve the driver's driving experience, the valve washing function needs to be skipped or terminated at this time and the vehicle enters the normal driving state.

[0041] 2. Vehicle charging status signal detection: Whether the vehicle is charging is one way to determine whether the driver intends to drive. If the TCU is awakened and the vehicle charging status signal sent to the TCU indicates that the driver does not intend to drive, the solenoid valve cleaning should be abandoned to avoid energy consumption of the vehicle.

[0042] 3. Power source speed, input shaft speed, and vehicle speed signal detection: For functional safety considerations, the input shaft speed, power source speed, and vehicle speed are assessed. The power source speed should include both motor and engine speeds to prevent unexpected movement during valve cleaning function operation caused by abnormal power-on / off conditions of the vehicle. After the TCU is activated, if the vehicle is in a state where power source speed and vehicle speed are present, performing the valve cleaning function may cause unexpected movement due to the torque transmitted by the clutch, potentially leading to a safety accident. Therefore, the power source speed, input shaft speed, and vehicle speed signals need to be detected before activating the valve cleaning function.

[0043] 4. Transmission main pressure signal detection: When the TCU is awakened after dormancy, a preliminary judgment can be made based on the main pressure. If the main pressure is higher than the threshold, it can be determined that the hydraulic system of the transmission has just finished working. At this time, the response capability of the solenoid valve has not yet suffered from slow response due to long-term inactivity. In order to avoid unnecessary energy consumption of the TCU, the valve body cleaning function is not required at this time. If the main pressure is lower than the threshold at this time, the solenoid valve needs to be flushed to avoid problems with the solenoid valve.

[0044] 5. Clutch K0 pressure signal detection: K0 pressure detection is a supplementary detection to the main pressure signal detection. Its purpose is to detect whether the current main pressure of the transmission system is really lower than the threshold, avoid false judgments caused by main pressure sensor failure, avoid unnecessary energy consumption, and diagnose the main pressure sensor.

[0045] In this embodiment, the specific implementation method of step S3 is as follows: the TCU sends a signal through the CAN gateway to wake up the electronic pump so that it can work normally, and sends the speed required to quickly build up the main pressure, so that the electronic pump can rotate and the transmission system main pressure can be built up quickly.

[0046] In this implementation scheme, to achieve rapid flushing of the clutch pressure solenoid valve K1 and the shift pressure solenoid valve PV2, the flushing method for the clutch pressure solenoid valve K1 and the shift pressure solenoid valve PV2 is as follows:

[0047] 1. Control the current of the shift flow solenoid valves FV2 and FV4 to the flow 0 point position to avoid unexpected gear engagement when flushing the shift pressure solenoid valve PV2.

[0048] 2. After ensuring that the current of the shift flow solenoid valves FV2 and FV4 reaches the flow 0 point, simultaneously increase the current of the clutch pressure solenoid valve K1 and the shift pressure solenoid valve PV2 to the preset value at a certain slope.

[0049] 3. After the current of clutch pressure solenoid valve K1 and shift pressure solenoid valve PV2 rises to the preset value, it remains at the preset value for a period of time.

[0050] 4. After the current of clutch pressure solenoid valve K1 and shift pressure solenoid valve PV2 is maintained for a period of time, the current of clutch pressure solenoid valve K1 and shift pressure solenoid valve PV2 is simultaneously reduced to 0 at a certain slope.

[0051] 5. After flushing the clutch pressure solenoid valve K1 and the shift pressure solenoid valve PV2, control the current of the shift flow solenoid valves FV2 and FV4 to 0.

[0052] The calibration table for the flushing settings of clutch pressure solenoid valve K1 and shift pressure solenoid valve PV2 is shown below.

[0053]

[0054] In this implementation scheme, to achieve rapid flushing of the clutch pressure solenoid valve K2 and the shift pressure solenoid valve PV1, the specific flushing method for the clutch pressure solenoid valve K2 and the shift pressure solenoid valve PV1 is as follows:

[0055] 1. Control the current of the shift flow solenoid valves FV1 and FV3 to the flow 0 point position to avoid unexpected gear engagement when flushing the shift pressure solenoid valve PV2.

[0056] 2. After ensuring that the current of the shift flow solenoid valves FV1 and FV3 reaches the flow 0 point, simultaneously increase the current of the clutch pressure solenoid valve K2 and the shift pressure solenoid valve PV1 to the preset value at a certain slope.

[0057] 3. After the current of clutch pressure solenoid valve K2 and shift pressure solenoid valve PV1 rises to the preset value, it remains at the preset value for a period of time.

[0058] 4. After the current of clutch pressure solenoid valve K2 and shift pressure solenoid valve PV1 is maintained for a period of time, the current of clutch pressure solenoid valve K2 and shift pressure solenoid valve PV1 is simultaneously reduced to 0 at a certain slope.

[0059] 5. After flushing the clutch pressure solenoid valve K2 and the shift pressure solenoid valve PV1, control the current of the shift flow solenoid valves FV1 and FV3 to 0.

[0060] The calibration table for the flushing settings of clutch pressure solenoid valve K2 and shift pressure solenoid valve PV1 is shown below.

[0061]

[0062] In this implementation scheme, to achieve rapid flushing of the clutch pressure solenoid valve K0, the specific flushing method for the clutch pressure solenoid valve K0 is as follows:

[0063] 1. Synchronous clutch pressure solenoid valve K1 and shift pressure solenoid valve PV2 increase the current of clutch pressure solenoid valve K0 to a preset value at a certain slope. After the current rises to the preset value, it is maintained for a certain time, and then the current drops to 0 at a certain slope.

[0064] 2. Repeat step 1 above, synchronously increase the current of clutch pressure solenoid valve K0 to a preset value at a certain slope when the clutch pressure solenoid valve K1 and shift pressure solenoid valve PV2 are synchronized. After the current rises to the preset value, it is maintained for a certain period of time, and then the current drops to 0 at a certain slope.

[0065] The calibration table for the flushing settings of the clutch pressure solenoid valve K0 is shown below.

[0066]

[0067] 3. After the clutch K0 current washing valve is completed, request the clutch K0 pressure to rise to the preset value at a certain slope;

[0068] 4. After the K0 pressure rises to the preset value, the clutch K0 pressure is requested to decrease to the preset value at a certain slope;

[0069] 5. Repeat steps 7.3 and 7.4, using a counter to count the cycles. Once the counter exceeds the preset value, the clutch K0 valve cleaning will end.

[0070] The calibration table for the flushing settings of the clutch pressure solenoid valve K0 is shown below.

[0071]

[0072] In this implementation plan, when any of the above conditions are triggered, the valve cleaning function should be stopped immediately, and all solenoid valves should be returned to their initial state, as detailed below:

[0073] 1. When the vehicle key is powered on, it indicates that the driver is about to drive during the valve wake-up process. If the valve wake-up function continues at this time, the vehicle will not enter normal driving mode, affecting the driver's overall driving experience. The valve wake-up function should be terminated at this time.

[0074] 2. TCU sleep signal trigger: The TCU receives a vehicle sleep signal from the vehicle CAN bus, indicating that the driver has left the vehicle. Continuing the valve washing function at this time will not help the vehicle's operation and does not meet the definition of vehicle sleep, affecting the operation of the vehicle gateway. Therefore, the valve washing function should be terminated, and the TCU should enter sleep mode, waiting for the next wake-up.

[0075] 3. Low main pressure in the transmission system: If the main pressure is too low during valve flushing, it indicates that there is excessive leakage in the transmission system and a problem with the hydraulic system. When the main pressure is too low, there is no hydraulic oil flushing the solenoid valve; the solenoid valve is simply activated, which is meaningless for flushing the solenoid valve. In this case, the valve flushing function should be terminated, and the transmission hydraulic system should be inspected.

[0076] 4. When the power source speed, vehicle speed, and input shaft speed are detected, the vehicle should be stationary under normal circumstances when the wake-up valve washing function is activated for functional safety considerations. However, the presence of speed and vehicle speed may result in torque transmission, causing unexpected movement by the driver. To avoid accidents, the wake-up valve washing function should be terminated immediately.

[0077] Finally, it should be noted that the above-described embodiments are merely preferred embodiments of the present invention used to illustrate the technical solutions of the present invention, and are not intended to limit them, much less limit the scope of protection of the present invention; although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of protection of the claims.

Claims

1. A control method for the wake-up valve of a P2 hybrid transmission, characterized in that, Includes the following steps: S1, TCU supports CAN wake-up function, can be woken up prematurely. This includes the TCU monitoring the vehicle's CAN signals. When the driver unlocks the door with the key, indicating the intention to drive, the TCU receives an activation signal from the vehicle's CAN and is woken up in advance to enter working mode. S2, the TCU receives and processes the input signal, and determines whether the conditions for entering the wake-up valve function are met based on the signal received by the TCU. If the conditions are met, then proceed to S3. The input signals include: S2.1, KL15 power-on signal detection for the entire vehicle; S2.2, Vehicle charging status signal detection; S2.3, Power source speed, input shaft speed, and vehicle speed signal detection; S2.4, Transmission main pressure signal detection; S2.5, Clutch K0 pressure signal detection; S3, TCU wakes up the electronic pump to establish the main pressure of the transmission system; S4, the TCU controls the clutch pressure solenoid valve K1 and the shift pressure solenoid valve PV2 to perform the first flush, the TCU controls the clutch pressure solenoid valve K0 to flush, and at the same time the TCU monitors the valve flushing termination conditions. When the termination conditions are met, the valve flushing function is immediately exited. S5, the TCU controls the clutch pressure solenoid valve K2 and the shift pressure solenoid valve PV1 to perform the first flush, the TCU controls the clutch pressure solenoid valve K0 to flush, and at the same time the TCU monitors the valve flushing termination conditions. When the termination conditions are met, the valve flushing function is immediately exited. S6, the TCU controls the clutch pressure solenoid valve K1 and the shift pressure solenoid valve PV2 to perform a second flush, the TCU controls the clutch pressure solenoid valve K0 to flush, and at the same time the TCU monitors the valve flushing termination conditions. When the termination conditions are met, the valve flushing function is immediately exited. S7, the TCU controls the clutch pressure solenoid valve K2 and the shift pressure solenoid valve PV1 to perform a second flush, the TCU controls the clutch pressure solenoid valve K0 to flush, and at the same time the TCU monitors the valve flushing termination conditions. When the termination conditions are met, the valve flushing function is immediately exited.

2. The control method for the wake-up valve of a P2 structure hybrid transmission according to claim 1, characterized in that, The clutch pressure solenoid valve K1 and shift pressure solenoid valve PV2 of S4 and S6 perform the same flushing method for the first and second flushing; the clutch pressure solenoid valve K2 and shift pressure solenoid valve PV1 of S5 and S7 perform the same flushing method for the first and second flushing; the flushing method of clutch pressure solenoid valve K0 is independent.

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