Intelligent flushing control method and system for pressure control electromagnetic valve of hybrid power gearbox

Abstract

The invention belongs to the technical field of hybrid power gearbox control, and particularly relates to an intelligent flushing control method and system for a pressure control electromagnetic valve of a hybrid power gearbox, and the method comprises the following steps: after a whole vehicle is powered on, continuously monitoring a main oil pressure value of the gearbox through an oil pressure sensor; when the main oil pressure value exceeds a preset qualified range and the duration time reaches a calibration threshold value associated with the oil temperature, the gearbox control unit starts an electromagnetic valve flushing program; waiting for a preset time interval to monitor the main oil pressure recovery condition after each washing cycle is completed; if the main oil pressure value returns to the qualified range, the scouring program is terminated; and if not, washing is repeated until the total washing time reaches the upper limit of the calibration time, and fault alarm is triggered. According to the electromagnetic valve, the problem of clamping stagnation of the electromagnetic valve is effectively solved, strong electromagnetic force can be generated in a large-current and multi-frequency washing mode, and impurities possibly causing clamping stagnation in the electromagnetic valve are effectively removed.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid power transmission control, and in particular to a method and system for intelligent flushing control of a pressure control solenoid valve of a hybrid power transmission. Background Art

[0002] In the gearbox of hybrid vehicles, high-pressure oil circuits are often used to control gear shifting and transmission components. Therefore, the solenoid valve plays a vital role in accurately controlling the pressure of the hydraulic system to achieve smooth gear shifting and efficient operation of the gearbox. However, when the gearbox oil temperature is low, its viscosity increases and its fluidity decreases. Impurities in the oil cannot be effectively removed, so they accumulate inside the solenoid valve core, causing the solenoid valve to get stuck. Once the solenoid valve gets stuck, it will cause abnormal gearbox oil pressure control, which will lead to problems such as gear shifting frustration and power transmission interruption, seriously affecting the vehicle's driving performance and safety.

[0003] At present, there are two existing solutions to the solenoid valve stuck problem. On the one hand, in the after-sales terminal market, the transmission oil is replaced regularly and the valve body is cleaned. On the other hand, during the transmission assembly process, the assembly environment and the cleanliness of the parts are strictly controlled. These two methods are not only costly, but also difficult to guarantee the effect, and cannot effectively solve the solenoid valve stuck problem. Therefore, it is of great practical significance to develop an efficient, low-cost method that can solve the hybrid transmission pressure control solenoid valve stuck problem in real time.

[0004] To this end, the present invention proposes a hybrid transmission pressure control solenoid valve intelligent flushing control method and system. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a method and system for intelligent flushing control of a hybrid power transmission pressure control solenoid valve.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A hybrid transmission pressure control solenoid valve intelligent flushing control method, comprising the following method steps: After the vehicle is powered on, the gearbox main oil pressure value is continuously monitored through the oil pressure sensor; When the main oil pressure value exceeds the preset qualified range and the duration reaches a calibrated threshold value associated with the oil temperature, the transmission control unit starts a solenoid valve flushing procedure; After each flushing cycle, wait for the preset interval to monitor the main oil pressure recovery; If the main oil pressure value returns to the qualified range, the flushing procedure is terminated; if it does not recover, the flushing is repeated until the total flushing time reaches the calibrated time upper limit and a fault alarm is triggered.

[0007] Furthermore, the flushing procedure includes: after the solenoid valve current is reset to zero, multiple pulse currents are applied, the amplitude of the pulse current is 90% to 100% of the solenoid valve working current range, and the duration of each pulse is 0.5 seconds.

[0008] Furthermore, the multiple pulse currents are five consecutive pulses, and each completion of five pulses is defined as one flushing cycle.

[0009] Furthermore, after each flushing cycle is completed, it is necessary to wait for 10 seconds to monitor the recovery of the main oil pressure; if the main oil pressure has not recovered to the acceptable range, the flushing cycle is repeated.

[0010] Furthermore, the amplitude of the pulse current is dynamically adjusted according to the vehicle state. If the vehicle is in motion, 95% to 100% of the working current range is used; if the vehicle is stationary, 90% to 95% of the working current range is used.

[0011] Furthermore, the calibration threshold and the upper limit of the calibration time are determined by looking up a table based on the oil temperature value detected in real time by the oil temperature sensor, wherein the lower the oil temperature, the greater the values ​​of the calibration threshold and the upper limit of the calibration time.

[0012] Furthermore, during the execution of the flushing program, if the oil temperature changes, the gearbox control unit updates the upper limit of the calibration time in real time and adjusts the amplitude of the pulse current or the cycle interval time.

[0013] Furthermore, the fault alarm includes the transmission control unit sending a "main oil pressure too high" fault code to the diagnostic system and displaying a transmission fault indicator light on the instrument panel.

[0014] The present invention also proposes an intelligent flushing control system for a hybrid transmission pressure control solenoid valve, comprising: Oil pressure sensor, used to monitor the main oil pressure value of the gearbox in real time; Oil temperature sensor, used to detect the transmission oil temperature; A solenoid valve driving module, used for outputting pulse current to the solenoid valve; The transmission control unit is configured to execute the control method.

[0015] Furthermore, the transmission control unit is integrated with a calibration database, which stores calibration thresholds, calibration time upper limits and pulse current parameters corresponding to different oil temperatures, and calls corresponding data according to the real-time oil temperature.

[0016] The above technical solution of the present invention has the following beneficial technical effects: The present invention effectively solves the problem of solenoid valve sticking: through a large current and multi-frequency flushing method, a strong electromagnetic force can be generated to effectively remove impurities inside the solenoid valve that may cause sticking. Compared with traditional methods, the effect of solving the sticking problem is more significant, greatly improving the working reliability of the solenoid valve and reducing gearbox failures caused by solenoid valve sticking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of the intelligent flushing process of the solenoid valve of the present invention; Figure 2 It is a schematic diagram of the flushing current of the solenoid valve of the present invention; Figure 3 A schematic diagram showing the relationship between the flushing success current and the pressure of the solenoid valve of the present invention; Figure 4 It is a schematic diagram of the system signal change after the solenoid valve of the present invention is successfully flushed; Figure 5 It is a schematic diagram of the relationship between oil temperature and calibration time of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0019] like Figure 1-Figure 5 As shown, the present invention provides a hybrid transmission pressure control solenoid valve intelligent flushing control method, comprising the following method steps: After the vehicle is powered on, the gearbox main oil pressure value is continuously monitored through the oil pressure sensor; When the main oil pressure value exceeds the preset qualified range and the duration reaches a calibrated threshold value associated with the oil temperature, the transmission control unit starts a solenoid valve flushing procedure; After each flushing cycle, wait for the preset interval to monitor the main oil pressure recovery; If the main oil pressure value returns to the qualified range, the flushing procedure is terminated; if it does not recover, the flushing is repeated until the total flushing time reaches the calibrated time upper limit and a fault alarm is triggered.

[0020] In a specific embodiment of the present invention, the flushing procedure includes: after the solenoid valve current is reset to zero, multiple pulse currents are applied, the amplitude of the pulse current is 90% to 100% of the solenoid valve operating current range, and each pulse lasts for 0.5 seconds.

[0021] In a specific embodiment of the present invention, the multiple pulse currents are 5 consecutive pulses, and each completion of 5 pulses is defined as a flushing cycle.

[0022] In a specific embodiment of the present invention, after each flushing cycle is completed, it is necessary to wait for 10 seconds to monitor the recovery of the main oil pressure; if the main oil pressure has not recovered to a qualified range, the flushing cycle is repeated.

[0023] In a specific embodiment of the present invention, the amplitude of the pulse current is dynamically adjusted according to the vehicle state. If the vehicle is in motion, 95% to 100% of the working current range is used; if the vehicle is stationary, 90% to 95% of the working current range is used.

[0024] In a specific implementation of the present invention, the calibration threshold and the upper limit of the calibration time are determined by looking up the oil temperature value detected in real time by the oil temperature sensor, wherein the lower the oil temperature, the larger the values ​​of the calibration threshold and the upper limit of the calibration time.

[0025] In a specific embodiment of the present invention, during the execution of the flushing program, if the oil temperature changes, the gearbox control unit updates the upper limit of the calibration time in real time and adjusts the amplitude of the pulse current or the cycle interval time.

[0026] In a specific embodiment of the present invention, the fault alarm includes the transmission control unit sending a "main oil pressure too high" fault code to the diagnostic system and displaying a transmission fault indicator light on the instrument panel.

[0027] The present invention also proposes an intelligent flushing control system for a hybrid transmission pressure control solenoid valve, comprising: Oil pressure sensor, used to monitor the main oil pressure value of the gearbox in real time; Oil temperature sensor, used to detect the transmission oil temperature; A solenoid valve driving module, used for outputting pulse current to the solenoid valve; The transmission control unit is configured to execute the control method.

[0028] In a specific embodiment of the present invention, the transmission control unit is integrated with a calibration database, which stores calibration thresholds, calibration time upper limits and pulse current parameters corresponding to different oil temperatures, and calls corresponding data according to the real-time oil temperature.

[0029] like Figure 1As shown in the figure, after the vehicle is powered on, the pressure sensor starts to monitor the oil pressure value, and the transmission control unit (TCU) determines the vehicle status based on the current oil pressure value. When the oil pressure value is not within the qualified range, the solenoid valve flushing program is executed. The transmission control unit (TCU) continuously adjusts the size of the solenoid valve flushing current according to the current oil temperature value transmitted by the oil temperature sensor, and at the same time, adjusts the flushing current frequency according to the current state of the solenoid valve. Within the calibration time, if the oil pressure returns to the normal range, the flushing process is terminated and the solenoid valve flushing is exited; otherwise, the diagnostic system alarms and the flushing process ends.

[0030] Specifically, after the vehicle is powered on: 1. The flushing current should be selected within 90% to 100% of the allowable operating current range according to the current oil temperature. For example, if the solenoid valve operating current range is 0 to 1500 mA, the solenoid valve flushing current should be within 1260 mA to 1500 mA. Specifically, the rising and falling rates of the solenoid valve step current need to be adjusted continuously according to the current oil temperature to avoid damage to the solenoid valve.

[0031] At the same time, when the solenoid valve is flushing, perhaps depending on the current state of the vehicle, if it is in motion, the flushing current value can be relatively large. If it is stationary, in order to avoid the noise and vibration generated by the flushing process affecting the driving experience, the current value can be relatively low.

[0032] 2. If Figure 2 When it is determined that the solenoid valve flushing procedure is to be performed, the current of the solenoid valve must be reduced to 0 first, and a preparation time of 0.5 seconds must be waited, and then flushed continuously with a large current for 5 times, and then wait for 15 seconds to judge the oil pressure. Specifically, when the oil pressure value is still outside the reasonable range, the flushing operation will continue, and the flushing current will be adjusted in real time according to the change of the current oil temperature.

[0033] 3. If Figure 3 If the oil pressure value returns to the normal range, wait for a while to judge the oil pressure value, and end the flushing process after confirmation.

[0034] 4. If Figure 4 As shown in the figure, if the oil pressure value returns to the normal range within the calibration time, the flushing is completed and the diagnostic fault code disappears. The above calibration time is related to the oil temperature. The calibration time is different at different oil temperatures. The specific corresponding relationship is as follows: Figure 5 As shown. Affected by temperature, the viscosity of the oil increases. The lower the temperature, the longer the hydraulic system pressure build-up time, and the longer the corresponding solenoid valve flushing calibration time. During this time, if the solenoid valve still cannot work normally, it is determined that the solenoid valve has failed and the hydraulic system has a fault.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hybrid transmission pressure control solenoid valve intelligent flushing control method, characterized in that: The method comprises the following steps: After the vehicle is powered on, the oil pressure sensor continuously monitors the main oil pressure value of the gearbox; When the main oil pressure value exceeds the preset qualified range and the duration reaches a calibrated threshold value associated with the oil temperature, the transmission control unit starts a solenoid valve flushing procedure; After each flushing cycle, wait for the preset interval to monitor the main oil pressure recovery; If the main oil pressure value returns to the qualified range, the flushing procedure is terminated; if it does not recover, the flushing is repeated until the total flushing time reaches the calibrated time upper limit and a fault alarm is triggered.

2. The method according to claim 1, characterized in that: The flushing procedure includes: after the electromagnetic valve current is reset to zero, multiple pulse currents are applied, the amplitude of the pulse current is 90% to 100% of the electromagnetic valve working current range, and the duration of each pulse is 0.5 seconds.

3. The method according to claim 2, characterized in that: The multiple pulse currents are 5 consecutive pulses, and each completion of 5 pulses is defined as a flushing cycle.

4. The method according to claim 3, characterized in that: After each flushing cycle, wait 10 seconds to monitor the main oil pressure recovery; if the main oil pressure does not recover to the acceptable range, repeat the flushing cycle.

5. The method according to claim 2, characterized in that: The amplitude of the pulse current is dynamically adjusted according to the vehicle state. If the vehicle is in motion, 95% to 100% of the working current range is used; if the vehicle is stationary, 90% to 95% of the working current range is used.

6. The method according to claim 1, characterized in that: The calibration threshold and the upper limit of the calibration time are determined by looking up a table based on the oil temperature value detected in real time by the oil temperature sensor, wherein the lower the oil temperature, the greater the values ​​of the calibration threshold and the upper limit of the calibration time.

7. The method according to claim 1, characterized in that: During the execution of the flushing program, if the oil temperature changes, the transmission control unit updates the upper limit of the calibration time in real time and adjusts the amplitude of the pulse current or the cycle interval time.

8. The method according to claim 1, characterized in that: The fault alarm includes the transmission control unit sending a "main oil pressure too high" fault code to the diagnostic system and displaying the transmission fault indicator light on the instrument panel.

9. A hybrid transmission pressure control solenoid valve intelligent flushing control system, characterized in that: include: Oil pressure sensor, used to monitor the main oil pressure value of the gearbox in real time; Oil temperature sensor, used to detect the transmission oil temperature; A solenoid valve driving module, used for outputting pulse current to the solenoid valve; A transmission control unit is configured to execute the control method according to any one of claims 1 to 8.

10. The system according to claim 9, characterized in that: The gearbox control unit is integrated with a calibration database, which stores calibration thresholds, calibration time upper limits and pulse current parameters corresponding to different oil temperatures, and calls corresponding data according to the real-time oil temperature.

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