Main oil way control method and controller

Abstract

According to the main oil way control method, under the static idle speed working condition, the current value of an SS electromagnetic valve is controlled to be a first current value, so that an SS oil cylinder pressure regulating valve is in a full-open state. In the full-open state, all hydraulic oil in the main oil way passes through the SS oil cylinder, so that the pressure of the main oil way is the same as the pressure measured by the SS pressure sensor. Under the condition, different main oil way target pressures are given, and the actual pressure of the main oil way is obtained through an SS pressure sensor under the different main oil way target pressures. And then compensating the current of the actuator corresponding to the main oil way according to the difference value between the target pressure of the main oil way and the actual pressure of the main oil way. The difference value of the two is used as a correction coefficient, and the correction coefficient is used for compensating the current.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic system control, in particular to a main oil line control method and a controller. BACKGROUND

[0002] Compared with the traditional fixed-gear transmission, continuously variable transmission (CVT) is a transmission whose speed ratio can be continuously changed. According to the engine load and driving resistance under different working conditions, the transmission speed ratio is flexibly adjusted to realize efficient engine operation efficiency. The CVT gearbox oil pump absorbs oil from the oil pan and then flows into the main oil line pipeline (primary oil line) to form the main line pressure (ML). Under the control of the electromagnetic valve of each actuator, it flows into the oil chamber of each actuator (such as steel belt, clutch, hydraulic torque converter) to provide the required oil pressure for each actuator. As the core "dry line" of the hydraulic system, the precise control of the main oil line pressure is crucial to the hydraulic control.

[0003] Generally, there is a certain relationship between the oil chamber pressure and the control current of the corresponding electromagnetic valve, which is called pressure-current characteristic (PC). The PC characteristic will change continuously with the vehicle / transmission durability decay, therefore, the relationship between the main oil line pressure and the current needs to be adaptively adjusted.

[0004] Currently, the adaptive adjustment of the main oil line pressure relies on the corresponding pressure sensor. However, the configuration of the sensor will increase the additional cost. SUMMARY

[0005] Therefore, the embodiments of the present application provide a main oil line control method and a controller, which realize the adjustment of the relationship between the main oil line pressure and the current without the main oil line pressure sensor, thereby reducing the cost.

[0006] To solve the above problems, the technical solutions provided by the embodiments of the present application are as follows:

[0007] In the first aspect of the present application, a main oil line control method is provided, characterized in that the method is applied to a controller and comprises:

[0008] In response to the vehicle being in a static idle working condition, the current value of the driven pulley oil chamber SS electromagnetic valve is controlled to be a first current value, so that the SS oil cylinder pressure regulating valve is in a fully open state;

[0009] Under different main oil line target pressures, the main oil line actual pressure is obtained based on the measurement value of the SS pressure sensor;

[0010] calculate an absolute value of a difference between the target pressure of the main oil circuit and the actual pressure of the main oil circuit corresponding to any target pressure of the main oil circuit;

[0011] determine a current compensation value by using the maximum absolute value of the difference as a correction coefficient, the current compensation value being used to compensate a current of an actuator corresponding to the main oil circuit.

[0012] In the second aspect of the present application, a controller is provided, and the controller comprises:

[0013] The control unit is configured to control the current value of the SS electromagnetic valve to be a first current value so as to make the SS oil cylinder pressure regulating valve in a fully open state in response to the vehicle being in a static idle operating condition.

[0014] The acquisition unit is configured to acquire the actual pressure of the main oil circuit based on a measurement value of the SS pressure sensor under different target pressures of the main oil circuit.

[0015] The calculation unit is configured to calculate an absolute value of a difference between the target pressure of the main oil circuit and the actual pressure of the main oil circuit corresponding to any target pressure of the main oil circuit.

[0016] The acquisition unit is further configured to determine a current compensation value by using the maximum absolute value of the difference as a correction coefficient, the current compensation value being used to compensate a current of an actuator corresponding to the main oil circuit.

[0017] In the third aspect of the present application, a controller is provided, and the controller comprises a processor and a memory.

[0018] The memory is configured to store computer readable instructions or computer programs.

[0019] The processor is configured to read the computer readable instructions or the computer programs so that the electronic device implements the method of the first aspect.

[0020] In the fourth aspect of the present application, a vehicle is provided, and the vehicle comprises the controller of the second aspect or the third aspect and a continuously variable transmission hydraulic control system.

[0021] The continuously variable transmission hydraulic control system comprises a driven pulley oil cavity SS and the SS electromagnetic valve.

[0022] In the fifth aspect of the present application, a computer readable storage medium is provided, and the computer readable storage medium stores instructions, when the instructions are run on a device, the device executes the method of the first aspect.

[0023] In a sixth aspect of the present application, a computer program product is provided, which, when running on a computer, causes the computer to execute the method of the first aspect.

[0024] Therefore, the embodiments of the present application have the following beneficial effects:

[0025] In the present application, when in the static idle operating condition, the current value of the SS solenoid valve is the first current value, so that the SS oil cylinder pressure regulating valve is in the fully open state. In the fully open state, the hydraulic oil in the main oil circuit will pass through the SS oil cylinder, so that the pressure of the main oil circuit is the same as the pressure measured by the SS pressure sensor. In this case, by setting different main oil circuit target pressures, the actual pressure of the main oil circuit is obtained by the SS pressure sensor under different main oil circuit target pressures. Then, the current of the main oil circuit corresponding to the actuator is compensated according to the difference between the main oil circuit target pressure and the actual pressure of the main oil circuit. That is, the difference between the two is used as a correction coefficient, and the correction coefficient is used to compensate the current. It can be seen that, by using the technical solution of the present application, the actual pressure of the main oil circuit is obtained by using the SS pressure sensor under a specific operating condition, and then the pressure adaptive learning of the main oil circuit is realized, without the need to additionally arrange a main oil circuit pressure sensor, thereby reducing the cost of the gearbox. In addition, through adaptive learning, the decay of the main oil circuit pressure characteristics due to durability is compensated, and the durability control effect of the gearbox is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A schematic diagram of the relationship between the driven wheel oil cylinder and the main oil circuit is provided for the embodiments of the present application;

[0027] Figure 2 A flowchart of the main oil circuit control method is provided for the embodiments of the present application;

[0028] Figure 3 An adaptive learning schematic diagram is provided for the embodiments of the present application;

[0029] Figure 4 A current compensation schematic diagram of the ML full pressure section is provided for the embodiments of the present application;

[0030] Figure 5 A controller device structure diagram is provided for the embodiments of the present application;

[0031] Figure 6 Another controller device structure diagram is provided for the embodiments of the present application;

[0032] Figure 7 A vehicle structure schematic diagram is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0033] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the embodiments of the present application are further described in detail below with reference to the drawings and specific embodiments.

[0034] At present, when the pressure of the main oil circuit is adaptively controlled, the main oil circuit pressure sensor is usually relied on. The actual pressure is obtained according to the sensor, compared with the target pressure of the control, and then the compensation current is calculated according to the comparison result, but the configuration of the sensor needs to increase additional cost.

[0035] For a continuously variable transmission, mainly including a steel belt and a primary and secondary pulley. The continuously variable transmission realizes continuous control of the speed ratio of the steel belt by adjusting the oil pressure of the primary and secondary pulley oil chambers. The secondary pulley realizes speed ratio control on one hand, and on the other hand, must overcome the torque load of the engine end and the wheel end, provide clamping force protection, and avoid damage to the steel belt. Therefore, the secondary pulley oil chamber (Secondary Pulley Solenoid, SS) pressure sensor is usually configured on the CVT to monitor the actual pressure of the SS in real time.

[0036] In order to match the control requirements of the whole vehicle cost, the present application proposes a ML pressure adaptive method not based on ML pressure sensor, which obtains the actual pressure of the main oil circuit by "borrowing" the secondary pulley oil chamber (Secondary Pulley Solenoid, SS) pressure sensor under certain working conditions, and then performs adaptive current compensation on the ML to improve the control performance of the hydraulic system under the condition of durability attenuation.

[0037] In order to facilitate the understanding of the specific implementation of the present application, the relationship between the secondary pulley oil cylinder and the main oil circuit is first introduced, and then the feasibility of obtaining the actual pressure of the main oil circuit through the SS pressure sensor is explained.

[0038] Referring to Figure 1 , the figure is a schematic diagram of the relationship between the secondary pulley oil cylinder and the main oil circuit provided by the embodiments of the present application. In actual work, the main oil circuit hydraulic oil flows into the secondary pulley oil cylinder through the pressure regulating valve. When the pressure regulating valve is at the dynamic balance position, the electromagnetic force on the left side is in force balance with the SS feedback force and the spring force on the right side, and there is the following relationship:

[0039]

[0040] P Slnd - electromagnetic control hydraulic pressure (there is an electromagnetic valve on the left side of the pressure regulating valve), A Slnd - electromagnetic control hydraulic pressure acting area, P SS - actual hydraulic pressure of the secondary pulley oil cylinder, A SS - actual hydraulic pressure acting area of the secondary pulley oil cylinder, FSpring - spring force, P ML - main oil passage hydraulic pressure.

[0041] From the above formula 1, when , the left electromagnetic control force of the pressure regulating valve will be greater than the right feedback force, the pressure regulating valve will not reach the balance position, and will be pushed to the leftmost valve core full opening state (indicating that the main oil passage liquid flows into the SS oil cylinder), at this time, P SS = P ML .

[0042] Specifically, only by setting the control current on the SS electromagnetic valve to be lower than a certain threshold (the control force is inversely proportional to the current, when the current is less than a certain threshold, the above inequality can be established), the actual pressure of the ML can be observed by the SS pressure sensor.

[0043] But at this time, the actual pressure of the SS will be significantly higher than the required target pressure, if the car is in the process of dynamic driving, it will obviously affect the speed ratio control, and the vehicle driving performance cannot be accepted. But in the static idle working condition, the steel belt is at the maximum speed ratio, at this time, increasing the actual pressure of the SS will not change the speed ratio. Therefore, only in the static idle working condition, the adaptive control strategy of the ML pressure can be realized. That is, in the static idle working condition, the actual pressure of the ML can be obtained through the SS sensor, and then the adaptive learning of the ML pressure can be realized.

[0044] Referring to Figure 2 , which is a main oil passage control method flowchart provided by the embodiment of the application, as shown in Figure 2 , the method is applied to a controller and includes the following steps.

[0045] S201: In response to the vehicle being in a static idle working condition, the current of the driven belt oil cavity SS electromagnetic valve is controlled to be a first current value, so that the SS oil cylinder pressure regulating valve is in a full opening state.

[0046] The vehicle being in a static idle working condition can include that the user is stepping on the accelerator pedal, the related operating parameters of the engine are within a preset threshold range, the gear of the vehicle is a preset gear, etc.

[0047] In addition, the adaptive learning can also be set to a learning number, when it is detected that the vehicle is in a static idle working condition, it is judged whether the adaptive learning number is greater than a preset number threshold, if not, the current of the SS electromagnetic valve is controlled to be the first current value. The adaptive number includes the number of successful learning or the number of failed learning.

[0048] Specifically, a learning success threshold and a learning failure threshold can be set for the current mileage or each power-on cycle. If the number of learning successes is less than the corresponding threshold and the number of learning failures is less than the corresponding threshold in the current mileage or the current power-on cycle, the current of the SS solenoid valve is controlled to be the first current value.

[0049] As known from the foregoing, the current on the SS solenoid valve is inversely proportional to the pressure. In order to make the SS cylinder pressure regulating valve in a fully open state, the corresponding pressure of the SS solenoid valve needs to be increased, and the current on the SS solenoid valve is correspondingly reduced. When it is lower than a certain threshold, the actual pressure of the ML can be observed using the SS pressure sensor. That is, the first current value is a current lower than a certain current threshold, which can make the SS cylinder pressure regulating valve in a fully open state.

[0050] S202: Under different main oil line target pressures, the actual pressure of the main oil line is obtained based on the measurement value of the SS pressure sensor.

[0051] In the adaptive learning phase, a plurality of main oil line target pressures are set respectively. Under different main oil line target pressures, the actual pressure of the ML is obtained through the SS pressure sensor.

[0052] For example, Figure 3 As shown, the pressure-current relationship of the ML is in a good linear relationship in most current ranges. Three ML pressures of the linear segment can be selected for adaptive learning, and the rate of target pressure increase is set. As shown, during the ML adaptive learning period, i.e., from t1 to t2, the target pressure of the ML can be set to learning pressure f1, learning pressure f2, and learning pressure f3. At the same time, during the adaptive learning period, the current of the SS solenoid valve is set to a certain fully open current value I, and at this time the actual pressure value of the ML can be read by the SS pressure sensor. After the learning is completed, the adaptive learning is exited from t2, and the target pressure of the ML is transitioned from the current learning pressure f3 to the regular control value f4, i.e., returns to the regular control value f4 at t3.

[0053] Specifically, after a given main oil line target pressure, the current value corresponding to the target pressure is calculated according to the relationship between the pressure and the current, and the corresponding actuator on the main oil line is controlled by using the current value, the pressure of the main oil line is changed by changing the flow of hydraulic oil on the main oil line, and the pressure obtained by the SS sensor.

[0054] In actual application, in order to ensure the accuracy of learning, the measurement value of the SS pressure sensor can be read multiple times in a target pressure learning stage, and the average of the multiple measurement values is taken as the pressure of the main oil line.

[0055] S203: For any main oil line target pressure, the absolute value of the difference between the main oil line target pressure and the corresponding actual pressure of the main oil line is calculated.

[0056] S204: The maximum absolute value of the difference is used as a correction coefficient, and the correction coefficient is used to determine the current compensation value.

[0057] After obtaining the actual pressure of each main oil circuit corresponding to the target pressure of the main oil circuit, the difference between the two is calculated, and the current is compensated by using the maximum absolute value of the difference. That is, the current of the actuator corresponding to the main oil circuit is compensated. That is, the maximum absolute value of the difference is used as a correction coefficient, and the correction coefficient is used to determine the current compensation value. The actuator includes the solenoid valve, pressure regulating valve, etc. of the main oil circuit.

[0058] It should be noted that, in general, the actual pressure of the main oil circuit is less than or equal to the target pressure of the main oil circuit, and when the actual pressure of the main oil circuit is greater than the target pressure of the main oil circuit, the current compensation can not be performed.

[0059] Specifically, when the correction coefficient is used to determine the current compensation value, the correction coefficient is multiplied by the correlation coefficient to obtain a first current compensation value. The correlation coefficient is the linear coefficient between the current and the pressure of the actuator corresponding to the main oil circuit. It should be noted that when the relationship between the current and the pressure of different actuators is different, the linear coefficient corresponding to the actuator is multiplied to achieve accurate compensation of the current.

[0060] Because in the adaptive learning, the learning is in the stage where the pressure and the current show a linear relationship, it cannot cover all stages of the use of ML. Therefore, the current compensation value learned by the linear segment needs to be generalized to the full pressure stage.

[0061] Specifically, the first current compensation value is used as the corresponding current compensation value in the first preset pressure range. The first preset pressure range is greater than or equal to 0 and less than or equal to the maximum target pressure of the main oil circuit.

[0062] The second current compensation value is used as the corresponding current compensation value in the second preset pressure range. The second current compensation value is obtained according to the endurance data of the actuator corresponding to the main oil circuit, and the second preset pressure range is greater than or equal to the preset pressure threshold.

[0063] The third current compensation value in the third preset pressure range is calculated according to the first current compensation value, the maximum target pressure of the main oil circuit, the second current compensation value, and the preset pressure threshold. The third current compensation value is positively correlated with the pressure in the third preset pressure range. The third preset pressure range is greater than or equal to the maximum target pressure of the main oil circuit and less than or equal to the preset pressure threshold.

[0064] For example, Figure 4f5 is the maximum main oil circuit target pressure, and f6 is a preset pressure threshold. The adaptive learning value is a first current compensation value, and the high-pressure current compensation value is a second current compensation value. According to the design principle of the electromagnetic valve and the endurance test data, the high-pressure attenuation characteristics of the ML are obtained, and the compensation current value required by the ML high-pressure is counted. When the ML target pressure is higher than f6, the fixed high-pressure current value is compensated; when the ML target pressure is less than f5, the adaptive learning value is directly used, including the low-pressure nonlinear segment (conservative compensation, increasing the control robustness); between the two pressures (f5 and f6), linear interpolation is adopted.

[0065] After the adaptive learning is completed, on the one hand, the target pressure of the ML / the electromagnetic valve current of the SS can also be restored to the normal. Specifically, the pressure of the control main oil circuit is decreased from the main oil circuit target pressure to the normal pressure according to a preset decreasing rate. For example, the maximum main oil circuit target pressure is the learning pressure f3, and the target pressure of the ML is decreased from the learning pressure f3 to the normal pressure according to a preset decreasing rate, so as to avoid too fast decrease and affect the whole vehicle driving experience. Similarly, the current of the control SS electromagnetic valve is increased from the first current value to the normal current value according to a preset increasing rate, so as to avoid too fast increase and affect the whole driving experience.

[0066] On the other hand, the success / failure of this adaptive learning is recorded and stored in the controller. If the adaptive learning is successful, the first current compensation value is stored and the adaptive success number is added by 1. For example, after learning the last ML learning pressure f3, this adaptive learning is successfully completed and normally exits. Specifically, in the current mileage range, the adaptive success number is added by 1; the adaptive current compensation value is calculated and recorded.

[0067] If the adaptive learning fails, the adaptive failure number is recorded and added by 1. Specifically, in the current mileage range, the adaptive failure number is added by 1; in the current power-on cycle, the adaptive failure number is added by 1. Wherein, the adaptive learning failure refers to that the vehicle does not meet the static idle condition in the adaptive learning process, and then the adaptive learning is exited.

[0068] It can be seen that, in the embodiment, the pressure of the main oil circuit is adaptively learned based on the steel belt pressure sensor, one main oil circuit pressure sensor is cancelled from the hardware, the cost of the gearbox is reduced, the attenuation of the main oil circuit pressure characteristics due to the endurance is compensated through the adaptive learning of the pressure, the actual pressure of the main oil circuit is accurately followed, the endurance control effect of the gearbox is ensured, the control performance is still high while the cost is reduced.

[0069] Based on the above method embodiment, the embodiment of the present application provides a controller, which will be described below with reference to the accompanying drawings.

[0070] Referring to Figure 5Fig. 1 is a structural diagram of a controller according to an embodiment of the present application, as shown in the figure, the controller 500 comprises a control unit 501, an acquisition unit 502, and a calculation unit 503. Figure 5

[0071] The control unit 501 is configured to, in response to the vehicle being in a static idle operating condition, control the current value of the driven pulley oil cavity SS solenoid valve to be a first current value, so that the SS oil cylinder pressure regulating valve is in a fully open state.

[0072] The acquisition unit 502 is configured to, under different main oil circuit target pressures, acquire the actual pressure of the main oil circuit based on the measurement value of the SS pressure sensor.

[0073] The calculation unit 503 is configured to, for any main oil circuit target pressure, calculate the absolute value of the difference between the main oil circuit target pressure and the corresponding actual pressure of the main oil circuit.

[0074] The acquisition unit 502 is further configured to take the maximum difference absolute value as a correction coefficient, and use the correction coefficient to determine a current compensation value, which is a compensation for the current of the main oil circuit corresponding actuator.

[0075] In some embodiments, the acquisition unit 502 is specifically configured to multiply the correction coefficient by a correlation coefficient to obtain a first current compensation value, the correlation coefficient being a linear coefficient between the current and the pressure of the main oil circuit corresponding actuator.

[0076] In some embodiments, the device further comprises a processing unit.

[0077] The processing unit is configured to take the first current compensation value as a corresponding current compensation value in a first preset pressure range, the first preset pressure range being greater than or equal to 0 and less than or equal to the maximum main oil circuit target pressure; take a second current compensation value as a corresponding current compensation value in a second preset pressure range, the second current compensation value being obtained according to the endurance data of the main oil circuit corresponding actuator, the second preset pressure range being greater than or equal to a preset pressure threshold; and calculate a third current compensation value in a third preset pressure range according to the first current compensation value, the maximum main oil circuit target pressure, the second current compensation value, and the preset pressure threshold, the third current compensation value being positively correlated with the pressure in the third preset pressure range.

[0078] In some embodiments, the control unit 501 is further configured to, after completing adaptive learning, control the pressure of the main oil circuit to decrease from the main oil circuit target pressure to a regular pressure at a preset decreasing rate; and / or control the current of the SS solenoid valve to increase from the first current value to a regular current value at a preset increasing rate.

[0079] ​In some embodiments, the control unit 501 is specifically configured to control the current value of the SS electromagnetic valve to be a first current value in response to the vehicle being in a static idle operating condition and the adaptive learning number being less than a preset number threshold, the adaptive learning number including a learning success number or a learning failure number.

[0080] In some embodiments, the device further includes a storage unit.

[0081] The storage unit is configured to store the first current compensation value and an adaptive learning success number plus 1 if adaptive learning is successful.

[0082] In some embodiments, the control unit 501 is further configured to exit adaptive learning and record an adaptive failure number plus 1 if the vehicle is in a non-static idle operating condition during the adaptive learning process.

[0083] In some embodiments, the vehicle being in a static idle operating condition includes one or more of the following:

[0084] The user does not step on the accelerator pedal, the related operating parameters of the engine are within a preset threshold range, and the gear of the vehicle is a preset gear.

[0085] It should be noted that the information execution process and the like of each unit in the above device can be specifically referred to the description in the method embodiments of the present application described above, and will not be described here.

[0086] In addition, an embodiment of the present application provides a controller, as shown in the figure, the controller 600 includes a memory 601 and a processor 602. Figure 6

[0087] The memory 601 is configured to store computer readable instructions or computer programs.

[0088] The processor 602 is configured to read the computer readable instructions or the computer programs, so that the device implements the main oil way control method.

[0089] In addition, an embodiment of the present application further provides a vehicle, as shown in the figure, the vehicle 700 includes a controller 701 and a continuously variable transmission hydraulic control system 702. Figure 7

[0090] The controller 701 can be the controller 500 in the example or the controller 600 in the example. Figure 5 Figure 6 The controller 500 in the example or the controller 600 in the example.

[0091] The continuously variable transmission hydraulic control system 702 includes a driven pulley oil cavity SS 7021 and an SS electromagnetic valve 7022. ​​​

[0092] The embodiment of the present application provides a computer readable storage medium, including instructions or a computer program, which, when executed on a computer, causes the computer to perform the main oil path control method.

[0093] It should be noted that the embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0094] It should be understood that, in the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" is used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that there are three cases of only A, only B and A and B at the same time, wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects. "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b or c can mean a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b and c can be single or multiple.

[0095] It should also be noted that, in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0096] The steps of the method or algorithm described in combination with the embodiments disclosed herein can be implemented directly by hardware, software modules executed by a processor, or a combination of the two. The software modules can be placed in random access memory (RAM), memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, register, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0097] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and, while certain embodiments according to the principles set forth herein have been shown and described, various modifications and substitutions can be made by those skilled in the art without departing from the spirit and scope of the application as set forth in the following claims. Therefore, the application is not intended to be limited to the embodiments disclosed herein, but rather is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A main oil circuit control method, characterized in that, The method is applied to a controller and includes: In response to the vehicle being in a static idling condition, the current value of the SS solenoid valve in the driven pulley oil chamber is controlled to be the first current value so that the SS cylinder pressure regulating valve is in the fully open state. Under different target pressures in the main oil circuit, the actual pressure of the main oil circuit is obtained based on the measurement values ​​of the SS pressure sensor; For any target pressure in the main oil circuit, calculate the absolute value of the difference between the target pressure in the main oil circuit and the corresponding actual pressure in the main oil circuit. The absolute value of the maximum difference is used as a correction coefficient, and the current compensation value is determined using the correction coefficient. The current compensation value is used to compensate for the current of the actuator corresponding to the main oil circuit.

2. The method according to claim 1, characterized in that, Determining the current compensation value using the correction coefficient includes: The correction coefficient is multiplied by the correlation coefficient to obtain the first current compensation value, where the correlation coefficient is the linear coefficient between the current and pressure of the actuator corresponding to the main oil circuit.

3. The method according to claim 2, characterized in that, The method further includes: The first current compensation value is used as the current compensation value within the first preset pressure range, where the first preset pressure range is greater than or equal to 0 and less than or equal to the maximum main oil circuit target pressure. The second current compensation value is used as the current compensation value corresponding to the second preset pressure range. The second current compensation value is obtained based on the durability data of the actuator corresponding to the main oil circuit. The second preset pressure range is greater than or equal to the preset pressure threshold. The third current compensation value is calculated within the third preset pressure range based on the first current compensation value, the maximum main oil circuit target pressure, the second current compensation value, and the preset pressure threshold. The third current compensation value is positively correlated with the pressure within the third preset pressure range.

4. The method according to claim 1, characterized in that, After completing adaptive learning, the method further includes one or more of the following: The pressure in the main oil circuit is controlled to decrease from the target pressure to the normal pressure at a preset rate. The current of the SS solenoid valve is controlled to rise from the first current value to the normal current value at a preset rising rate.

5. The method according to claim 1, characterized in that, The response to the vehicle being in a static idling condition, controlling the current value of the SS solenoid valve to be a first current value includes: In response to the vehicle being in a static idling condition and the number of adaptive learning attempts being less than a preset threshold, the current value of the SS solenoid valve is controlled to be a first current value, wherein the number of adaptive learning attempts includes the number of successful learning attempts or the number of failed learning attempts.

6. The method according to claim 5, characterized in that, The method further includes: If adaptive learning is successful, store the first current compensation value and increment the number of successful adaptive learning attempts by 1.

7. The method according to claim 5, characterized in that, In the adaptive learning process, the method further includes: If the vehicle is in a non-static idling condition, exit adaptive learning and increment the number of adaptive failures by 1.

8. The method according to claim 1, characterized in that, The vehicle being in a static idling condition includes one or more of the following: The user did not press the accelerator pedal, the relevant operating parameters of the engine were within the preset threshold range, and the vehicle was in the preset gear.

9. A controller, characterized in that, The controller includes: The control unit is used to control the current value of the SS solenoid valve in the driven pulley oil chamber to a first current value in response to the vehicle being in a static idling condition, so that the SS cylinder pressure regulating valve is in a fully open state. The acquisition unit is used to acquire the actual pressure of the main oil circuit based on the measurement value of the SS pressure sensor under different target pressures of the main oil circuit; The calculation unit is used to calculate the absolute value of the difference between the target pressure of the main oil circuit and the corresponding actual pressure of the main oil circuit for any target pressure of the main oil circuit. The acquisition unit is further configured to use the absolute value of the maximum difference as a correction coefficient, and use the correction coefficient to determine the current compensation value, wherein the current compensation value is used to compensate the current of the actuator corresponding to the main oil circuit.

10. A controller, characterized in that, The controller includes: a processor and a memory; The memory is used to store computer-readable instructions or computer programs; The processor is configured to read the computer-readable instructions or the computer program to cause the electronic device to implement the method of any one of claims 1-8.

11. A vehicle, characterized in that, The vehicle includes the controller as described in claim 9 or claim 10 and the continuously variable transmission hydraulic control system; The continuously variable transmission (CVT) hydraulic control system includes a driven pulley oil chamber SS and the SS solenoid valve.

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