Hydraulic control method and device, electronic equipment and storage medium

Abstract

The invention provides a hydraulic control method and device, electronic equipment and a storage medium, and the hydraulic control method comprises the steps that first required oil pressure corresponding to an automatic transmission is determined, and main oil pressure in a main oil way corresponding to the automatic transmission is controlled according to the first required oil pressure; for the first clutch not provided with the pressure sensor, second required oil pressure corresponding to the first clutch is determined; and according to the first required oil pressure and the second required oil pressure, the target opening degree of an electromagnetic valve corresponding to the first clutch is determined, the opening degree of the electromagnetic valve is controlled to be adjusted to be the target opening degree, and the electromagnetic valve is arranged between the main oil way and a pressure cavity corresponding to the first clutch. The first required oil pressure can be prevented from performing full-pressure control on the clutch, the clutch is prevented from being combined too tightly and suddenly, and the service life of the clutch is prolonged.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a hydraulic control method, device, electronic equipment and storage medium. Background Art

[0002] The multi-clutch automatic transmission can shift gears quickly and accurately, so that the vehicle has better power response in acceleration, overtaking and other situations, and improves the driving pleasure and safety. At present, for automatic transmissions that do not have corresponding pressure sensors for all or part of the clutches, when pressure control is performed on the clutches without pressure sensors, full pressure control is mostly performed based on the main oil pressure in the main oil circuit corresponding to the transmission. In other words, the opening of the solenoid valve corresponding to the clutch without pressure sensors is always the largest, and the main oil pressure acts directly on the clutch. Since the main oil pressure is always higher than the clutch pressure, and when the main oil pressure is much higher than the required pressure of the clutch, the clutch may be engaged too tightly and suddenly, which will accelerate the wear of the clutch plate, affect the performance of the clutch, shorten the service life of the clutch, and cause abnormal phenomena such as shaking and slipping of the clutch during operation, affecting the power transmission and stability of the vehicle, and thus affecting driving comfort. Summary of the invention

[0003] The embodiments of the present application provide a hydraulic control method, device, electronic device and storage medium to solve the problem of affecting clutch performance when full pressure control of main oil pressure is used for a clutch without a pressure sensor in the prior art.

[0004] In a first aspect, an embodiment of the present application provides a hydraulic control method, the method comprising:

[0005] determining a first required oil pressure corresponding to the automatic transmission, and controlling a main oil pressure in a main oil circuit corresponding to the automatic transmission according to the first required oil pressure;

[0006] For a first clutch not provided with a pressure sensor, determining a second required oil pressure corresponding to the first clutch;

[0007] According to the first required oil pressure and the second required oil pressure, the target opening of the solenoid valve corresponding to the first clutch is determined, and the opening of the solenoid valve is controlled to be adjusted to the target opening, wherein the solenoid valve is arranged between the main oil circuit and the pressure chamber corresponding to the first clutch.

[0008] In a second aspect, an embodiment of the present application further provides a hydraulic control device, the device comprising:

[0009] a first determining module, configured to determine a first required oil pressure corresponding to the automatic transmission, and to control a main oil pressure in a main oil circuit corresponding to the automatic transmission according to the first required oil pressure;

[0010] A second determination module is used to determine a second required oil pressure corresponding to a first clutch that is not provided with a pressure sensor;

[0011] A control module is used to determine the target opening of the solenoid valve corresponding to the first clutch according to the first required oil pressure and the second required oil pressure, and control the opening of the solenoid valve to be adjusted to the target opening, wherein the solenoid valve is arranged between the main oil circuit and the pressure chamber corresponding to the first clutch.

[0012] In a third aspect, an embodiment of the present application further provides an electronic device, which includes a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the above-mentioned hydraulic control method when executed by the processor.

[0013] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the above-mentioned hydraulic control method is implemented.

[0014] The embodiments of the present application include at least the following technical effects:

[0015] The technical solution of the embodiment of the present application determines the main oil pressure in the main oil circuit corresponding to the automatic transmission, i.e., the first required oil pressure, and the second required oil pressure corresponding to the first clutch in the automatic transmission where no pressure sensor is provided, and determines the target opening of the solenoid valve arranged between the main oil circuit and the pressure chamber corresponding to the first solenoid valve according to the first required oil pressure and the second required oil pressure, so that the actual oil pressure entering the pressure chamber of the clutch through the solenoid valve is approximately equal to the second required oil pressure, thereby avoiding the first required oil pressure from performing full pressure control on the clutch, avoiding the clutch from being engaged too tightly and suddenly, and extending the service life of the clutch. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0017] Figure 1 It is one of the flow charts of the hydraulic control method provided in the embodiment of the present application;

[0018] Figure 2 This is the second flow chart of the hydraulic control method provided in the embodiment of the present application;

[0019] Figure 3 is a structural schematic diagram of a hydraulic control device provided in an embodiment of the present application;

[0020] Figure 4 A block diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0023] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the following processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0024] In the prior art, in a multi-clutch automatic transmission, for a clutch without a pressure sensor, full pressure control is usually performed based on the main oil pressure in the main oil circuit corresponding to the transmission when pressure control is performed. That is, the opening of the solenoid valve corresponding to the clutch without a pressure sensor is always the largest, and the main oil pressure acts directly on the clutch. Since the main oil pressure is always higher than the required pressure of the clutch, and when the main oil pressure is much higher than the required pressure of the clutch, that is, when the actual oil pressure of the clutch is much higher than the required pressure of the clutch, the clutch may be engaged too tightly and suddenly, accelerating the wear of the clutch plate, affecting the performance of the clutch, and thus shortening the service life of the clutch. It may also cause abnormal phenomena such as shaking and slipping of the clutch during operation, affecting the power transmission and stability of the vehicle, and thus affecting driving comfort.

[0025] Therefore, the inventor proposes a hydraulic control solution to solve the problem of affecting clutch performance when the main oil pressure full pressure control is used for a clutch without a pressure sensor in the prior art. The technical solution of the present application is described below through specific embodiments.

[0026] like Figure 1As shown, an embodiment of the present application provides a hydraulic control method, the method comprising:

[0027] Step 101: Determine a first required oil pressure corresponding to an automatic transmission, and control the main oil pressure in a main oil circuit corresponding to the automatic transmission according to the first required oil pressure.

[0028] After the vehicle is started, the automatic transmission needs to be able to flexibly select the appropriate clutch and gear combination to transmit power according to the vehicle's driving conditions, so that the engine can work under more efficient conditions. Therefore, in order to ensure the normal operation of the automatic transmission, it is necessary to determine the oil pressure required by the automatic transmission, that is, the first required oil pressure, according to the working requirements of the automatic transmission, and after determining the first required oil pressure, control the main oil pressure in the main oil circuit corresponding to the automatic transmission according to the first required pressure, so that the main oil pressure in the main oil circuit is equal to the first required oil pressure.

[0029] Specifically, the hydraulic regulation of the main oil pressure in the main oil circuit can be achieved by adjusting the main oil pressure of the main oil circuit through the solenoid valve on the main oil circuit, or by changing the original output to adjust the main oil pressure of the main oil circuit, or by using a throttling device to adjust the main oil pressure of the main oil circuit. The hydraulic regulation method of the main oil pressure is not specifically limited in this application.

[0030] Step 102: for a first clutch not provided with a pressure sensor, determine a second required oil pressure corresponding to the first clutch.

[0031] In the embodiment of the present application, some of the multiple clutches matched with the automatic transmission may not be provided with a pressure sensor, or all of the clutches may not be provided with a pressure sensor. The clutch not provided with a pressure sensor is the first clutch, and the clutch provided with a pressure sensor is the second clutch.

[0032] In the clutch, oil pressure is the key factor to achieve smooth power transmission. When the oil pressure acts on the piston in the pressure chamber of the clutch, the piston pushes the clutch plate, and as the oil pressure increases, the pressing force between the clutch plates gradually increases. The power generated by the flywheel of the engine is transmitted to the input shaft of the transmission through friction. At this time, by accurately controlling the size and change speed of the clutch oil pressure, the progressive transmission of power can be achieved to avoid sudden power shocks when the vehicle starts or shifts gears.

[0033] For the second clutch, since a pressure sensor is provided, the opening of the solenoid valve between the pressure chamber of the second clutch and the main oil circuit can be accurately controlled based on the clutch pressure collected by the pressure sensor. Therefore, the opening control of the solenoid valve corresponding to the second clutch is not within the hydraulic control range of the embodiment of the present application.

[0034] The embodiment of the present application is directed to the first clutch. It should be noted that when there are multiple first clutches, the corresponding second required oil pressure is determined for each of the multiple first clutches.

[0035] Specifically, when determining the second required oil pressure, it is necessary to combine the driving conditions of the vehicle, the clutch's own characteristics, etc.

[0036] Step 103, determining a target opening of the solenoid valve corresponding to the first clutch according to the first required oil pressure and the second required oil pressure, and controlling the opening of the solenoid valve to be adjusted to the target opening, wherein the solenoid valve is arranged between the main oil circuit and the pressure chamber corresponding to the first clutch.

[0037] Specifically, a solenoid valve is provided between the main oil circuit and the pressure chamber corresponding to each first clutch, and the solenoid valve is used to adjust the oil pressure entering the pressure chamber of the clutch from the main oil circuit. Since the main oil pressure in the main oil circuit is determined based on the first required oil pressure, the first required oil pressure is the main oil pressure in the main oil circuit corresponding to the automatic transmission.

[0038] Then, after determining the first required oil pressure and the second required oil pressure, the target opening of the solenoid valve corresponding to the first clutch can be determined according to the first required oil pressure and the second required oil pressure, and the opening of the solenoid valve can be controlled to be adjusted to the target opening.

[0039] Among them, the first required oil pressure is the main oil pressure in the main oil circuit, and the second required oil pressure is the required oil pressure of the clutch. By controlling the opening of the clutch solenoid valve, the actual oil pressure entering the pressure chamber of the clutch through the solenoid valve is approximately equal to the second required oil pressure.

[0040] It should be noted that there is a certain relationship between the flow rate of oil passing through the solenoid valve and the opening of the solenoid valve, as well as the main oil pressure and the required oil pressure corresponding to the clutch. Different solenoid valves have different flow-opening characteristic curves, which are usually determined by the design and manufacture of the solenoid valve. The characteristic curve can be linear or non-linear. Among them, when the first required oil pressure is greater than the second required oil pressure, the target opening of the solenoid valve can be determined based on the difference between the first required oil pressure and the second required oil pressure, combined with the flow-opening characteristic curve of the solenoid valve. When the first required oil pressure is less than the second required oil pressure, the target opening is the maximum opening of the solenoid valve, so that the main oil pressure of the main oil circuit, that is, the first required oil pressure, can act entirely on the clutch.

[0041] When the opening of the solenoid valve is controlled to be adjusted to the target opening, the opening can be adjusted by sending a corresponding control signal to the solenoid valve. For a current-driven solenoid valve, different currents are output to control the valve core position of the solenoid valve.

[0042] In the embodiment of the present application, by determining the main oil pressure in the main oil circuit corresponding to the automatic transmission, i.e., the first required oil pressure, and the second required oil pressure corresponding to the first clutch in the automatic transmission where no pressure sensor is provided, the target opening of the solenoid valve arranged between the main oil circuit and the pressure chamber corresponding to the first solenoid valve is determined according to the first required oil pressure and the second required oil pressure, so that the actual oil pressure entering the pressure chamber of the clutch through the solenoid valve is approximately equal to the second required oil pressure, thereby avoiding the first required oil pressure from performing full pressure control on the clutch, avoiding the clutch from being engaged too tightly and suddenly, and extending the service life of the clutch.

[0043] In an optional embodiment of the present application, determining the first required oil pressure corresponding to the automatic transmission in step 101 includes:

[0044] Obtaining a current input shaft speed, a current input shaft torque, and a current gear position corresponding to the automatic transmission;

[0045] determining a first main oil pressure according to the current input shaft speed;

[0046] determining a second main oil pressure according to the current input shaft torque and the current gear position;

[0047] The maximum value among the first main oil pressure, the second main oil pressure and a preset limit main oil pressure is determined as the first required oil pressure.

[0048] When determining the first required oil pressure of the automatic transmission, that is, the main oil pressure in the main oil circuit, it is necessary to obtain the current input shaft speed, the current input shaft torque and the current gear of the automatic transmission. Here, the current input shaft speed is the current speed transmitted by the engine to the automatic transmission, the current input shaft torque is the torque transmitted by the engine to the automatic transmission, and the current gear is the gear of the automatic transmission, wherein the gear of the automatic transmission is used to change the transmission ratio to control the vehicle speed and power output.

[0049] The automatic transmission includes numerous gears, bearings, shafts and other components. These components require good lubrication to reduce friction and wear when the input shaft rotates. Therefore, it is necessary to determine the first main oil pressure based on the current input shaft speed of the automatic transmission. The first main oil pressure is used to lubricate the components during the rotation of the input shaft.

[0050] Because a larger input shaft torque requires a stronger clutch to transmit, when the input shaft torque increases, in order to ensure that the power can be effectively transmitted, the oil pressure usually needs to be increased accordingly. For example, when the vehicle accelerates or climbs a slope, the torque output by the engine increases, and the automatic transmission needs to increase the oil pressure to increase the pressing force between the clutch plates to prevent slippage. If the oil pressure does not increase accordingly, it may cause poor power transmission and even damage the internal components of the transmission. When the vehicle needs greater traction, such as starting, climbing or heavy-loaded driving, the automatic transmission will select a low gear. At this time, the input shaft torque is amplified by a larger transmission ratio and transmitted to the wheels. In low gear, due to the large transmission ratio and the large torque transmitted, the oil pressure requirement is usually high. As the gear increases, the transmission ratio decreases, the torque transmitted is relatively reduced, and the oil pressure requirement is usually reduced. Therefore, it is necessary to determine the second main oil pressure based on the current input shaft torque and the current gear of the automatic transmission. The second main oil pressure is used to meet the current input shaft torque and the clutch can be reliably combined under the current gear to ensure the effective transmission of torque.

[0051] The setting of the preset limit main oil pressure is mainly to ensure the basic functions of the automatic transmission. Too low main oil pressure may cause the clutch to not engage or disengage normally, the hydraulic components to not work properly, the lubrication and cooling systems to not circulate oil effectively, etc. By setting the preset limit main oil pressure, it can be ensured that the first demand oil pressure is not lower than the preset limit main oil pressure, providing a basic safety guarantee for the hydraulic system of the automatic transmission, ensuring that the automatic transmission can work normally even under some special working conditions, such as when the vehicle is at extremely low speed.

[0052] After the first main oil pressure and the second main oil pressure are determined, the maximum value among the first main oil pressure, the second main oil pressure and the preset limit main oil pressure is determined as the first required oil pressure.

[0053] The above-mentioned implementation scheme of the present application, by determining the first main oil pressure and the second main oil pressure, and determining the maximum value of the first main oil pressure, the second main oil pressure and the preset limit main oil pressure as the first required oil pressure, can make the main oil pressure of the main oil circuit determined based on the first required oil pressure accurately match the power transmission requirement, adapt to different speed conditions, match different torque requirements, and can also accurately control the oil pressure during gear shifting, quickly respond to driving intentions, avoid excessive wear and damage of components, and ensure the effective operation of the lubrication and cooling systems.

[0054] In an optional embodiment of the present application, determining the first main oil pressure according to the current input shaft speed includes:

[0055] Acquire a first corresponding relationship between an input shaft speed and a first main oil pressure;

[0056] According to the first corresponding relationship, a first main oil pressure corresponding to the current input shaft speed is determined.

[0057] Specifically, when determining the first main oil pressure, it is necessary to obtain a first corresponding relationship between a pre-calibrated input shaft speed and the first main oil pressure.

[0058] The first correspondence may be:

[0059]

[0060] Where n is the input shaft speed.

[0061] According to the first corresponding relationship, the first main oil pressure corresponding to the current input shaft speed can be determined.

[0062] The above implementation scheme of the present application can make the automatic transmission better adapt to the power transmission requirements of the vehicle at different driving speeds by determining the first main oil pressure according to the current input shaft speed. When driving at low speed, the input shaft speed is low, and the main oil pressure required at this time is also relatively low, which can meet the power transmission requirements of the vehicle under starting and slow driving conditions. When the vehicle is in the idling state, the input shaft speed is low, and the corresponding main oil pressure can be maintained at a low level, so that the hydraulic components inside the transmission work at a lower pressure, which not only ensures that the power can be transmitted to the wheels to achieve slow movement of the vehicle, but also avoids energy loss and component wear caused by excessive oil pressure. When the vehicle is driving at high speed, the input shaft speed increases, and the automatically adjusted increased main oil pressure can provide sufficient pressure for the high-speed running parts inside the transmission, ensuring efficient and stable power transmission, such as when overtaking at high speed, it can ensure that the transmission responds quickly and transmits sufficient power.

[0063] In an optional embodiment of the present application, determining the second main oil pressure according to the current input shaft torque and the current gear position includes:

[0064] Obtaining a second corresponding relationship between input shaft torque, gear position and main oil pressure;

[0065] According to the second corresponding relationship, a second main oil pressure corresponding to the current input shaft torque and the current gear is determined.

[0066] Specifically, when determining the second main oil pressure, it is necessary to obtain a pre-calibrated second correspondence between the input shaft torque, gear position and main oil pressure, and then determine the second main oil pressure corresponding to the current input shaft torque and the current gear position based on the second correspondence. The second correspondence can be a main oil pressure map constructed based on the input shaft torque and gear position.

[0067] When the input torque increases, a higher main oil pressure is required to ensure that the clutch, brake and other components inside the transmission can effectively transmit power and prevent slipping. Since a larger torque requires a greater friction force to transmit, a higher main oil pressure can create a stronger pressure between the friction plates of the clutch and brake, thereby generating sufficient friction. For example, when the vehicle is climbing a slope or accelerating suddenly, the torque output by the engine is large. At this time, it is necessary to find the appropriate main oil pressure in the main oil pressure map table according to the larger input torque to ensure that the power can be transmitted smoothly.

[0068] Different gears also have different requirements for the main oil pressure. In low gears, such as 1st or 2nd gear, the transmission needs to provide a larger torque amplification factor to meet the needs of vehicle starting, climbing and other working conditions. At this time, the clutch and brake need to bear a larger load, so a higher main oil pressure is usually required. In high gears, the main task of the transmission is to achieve high-speed and efficient power transmission, the torque amplification factor is relatively small, and the main oil pressure requirement may be relatively low. For example, in the high-speed cruising state of 5th or 6th gear, the main oil pressure can be appropriately reduced, which is reflected in the main oil pressure Map table as the main oil pressure changes with the input torque in different gears.

[0069] The above implementation scheme of the present application can ensure that the transmission can effectively transmit power under various load conditions by determining the second main oil pressure according to the current input shaft torque and the current gear, and can optimize power transmission according to the characteristics of the gear. In low gear, the transmission ratio is large and a large torque is required to drive the vehicle. Therefore, determining a relatively high main oil pressure according to the characteristics of the low gear helps to provide sufficient power when starting and driving at low speeds. In high gear, the transmission ratio is small and the vehicle speed is fast. The main oil pressure determined according to the high gear can ensure power transmission while allowing the transmission to work at a more economical oil pressure, thereby improving fuel economy.

[0070] In an optional embodiment of the present application, when the plurality of clutches corresponding to the automatic transmission include at least one second clutch provided with a pressure sensor, after determining the maximum value among the first main oil pressure, the second main oil pressure and a preset limit main oil pressure as the first required oil pressure, the method further includes:

[0071] Obtaining input end torque, clutch torque ratio, measured clutch gain and preset pressure compensation corresponding to the second clutch;

[0072] determining a third main oil pressure corresponding to the second clutch according to the input end torque, the clutch torque ratio, the measured clutch gain and the preset pressure compensation;

[0073] comparing the third main oil pressure and the first required oil pressure;

[0074] When the third main oil pressure is greater than the first required oil pressure, determining the third main oil pressure as the first required oil pressure;

[0075] When the third main oil pressure is less than or equal to the first required oil pressure, the first required oil pressure is kept unchanged.

[0076] Specifically, when at least one second clutch provided with a pressure sensor is included in the multiple clutches corresponding to the automatic transmission, since the second clutch is provided with a pressure sensor, the clutch gain, i.e., the measured clutch gain, can be calculated based on the clutch pressure collected by the pressure sensor. Therefore, when calculating the first required oil pressure, when there is a second clutch, it is necessary to calculate the third main oil pressure corresponding to the second clutch for the second clutch. The measured clutch gain is the ratio of the clutch torque to the clutch pressure, which reflects the torque that the clutch can transmit under unit pressure.

[0077] Among them, the third main oil pressure = input torque * clutch torque ratio / measured clutch gain + pressure compensation. Among them, the clutch torque ratio is the ratio of the clutch torque to the transmission input torque, which indicates the proportional relationship between the torque actually transmitted by the clutch and the input torque. The pressure compensation is the clutch overpressure, which is generally above 2 bar. Increasing the overpressure can ensure that after the clutch is engaged, the clutch slip caused by torque fluctuations or other factors can be eliminated, making the clutch engagement more thorough.

[0078] After the third main oil pressure is obtained, it is compared with the first required oil pressure, and the larger one is determined as the first required oil pressure. That is, when the third main oil pressure is greater than the first required oil pressure, the third main oil pressure is determined as the first required oil pressure; when the third main oil pressure is less than or equal to the first required oil pressure, the first required oil pressure remains unchanged.

[0079] In the above implementation scheme of the present application, for the second clutch provided with a pressure sensor, the third main oil pressure corresponding to the second clutch is also calculated, and the third main oil pressure is used as an influencing factor for determining the first required oil pressure, so that the main oil pressure can ensure the normal operation of the second clutch.

[0080] In an optional embodiment of the present application, determining the second required oil pressure corresponding to the first clutch in step 102 includes:

[0081] Obtaining the input end torque, clutch torque ratio, bench-measured clutch gain, and preset torque compensation corresponding to the first clutch;

[0082] Determine the target required oil pressure based on the input torque, clutch torque ratio, bench-measured clutch gain, and preset torque compensation;

[0083] The target required oil pressure is determined as the second required oil pressure.

[0084] Specifically, when determining the second required oil pressure corresponding to the first clutch, since the first clutch is not provided with a pressure sensor, it is necessary to obtain its clutch gain, ie, the bench-measured clutch gain, based on bench testing.

[0085] When the target required oil pressure is determined based on the input end torque, clutch torque ratio, bench-measured clutch gain and preset torque compensation, the target required oil pressure = (input end torque + preset torque compensation) * clutch torque ratio / bench-measured clutch gain.

[0086] Among them, the preset torque compensation is to increase the torque over-torque at the input end. This method can better reduce the problem of clutch closing affected by torque fluctuation.

[0087] In the above implementation scheme of the present application, when calculating the second required oil pressure, by introducing the input end torque, the oil pressure can be accurately matched with the actual power input. By introducing the two parameters of clutch torque ratio and bench-measured clutch gain, the structure and performance characteristics of the clutch itself are taken into account. The clutch torque ratio reflects the actual torque distribution of the clutch during the power transmission process, and the bench-measured clutch gain reflects the sensitivity of the clutch to the oil pressure. The data obtained through the experimental bench test can more accurately reflect the working characteristics of the clutch. Combining these two parameters to determine the oil pressure can optimize the power transmission according to the specific characteristics of the clutch, so that the clutch can work in the best state under various working conditions. The preset torque compensation is set in consideration of various factors that may occur in the actual working environment, ensuring that the clutch can work normally, effectively reducing the unstable power transmission caused by various uncertain factors, and improving the reliability of the system.

[0088] In an optional embodiment of the present application, after determining the target required oil pressure as the second required oil pressure, the method further includes:

[0089] comparing the target required oil pressure with a preset pressure;

[0090] When the target required oil pressure is greater than the preset pressure, determining the target required pressure as the second required pressure;

[0091] When the target required oil pressure is less than or equal to the preset pressure, the preset pressure is determined as the second required pressure.

[0092] Specifically, in order to ensure that there is sufficient pressing force between the clutch plates to transmit power under any working conditions, a preset pressure is set, which needs to be determined through test calibration. For example, the preset pressure can be set to 5 bar. When the clutch pressure is lower than the preset pressure, the friction between the clutch plates may not be sufficient to withstand the torque transmitted by the engine, resulting in slippage.

[0093] By comparing the target required oil pressure and the preset pressure and determining the larger one as the second required pressure, it can be determined that the actual clutch oil pressure is greater than the preset pressure, thereby avoiding the problem of slipping due to insufficient friction between the clutch plates, which makes it unable to withstand the torque transmitted by the engine.

[0094] The above implementation scheme of the present application compares the target required oil pressure with the preset pressure to avoid the situation where the actual oil pressure of the clutch is less than the preset oil pressure, thereby ensuring normal contact and separation of the clutch plate and reducing abnormal wear caused by insufficient pressure.

[0095] The overall implementation process of the embodiment of the present application is introduced below. Figure 2 As shown, when determining the target opening of the solenoid valve corresponding to the first clutch, it is necessary to determine the first required oil pressure and the second required oil pressure, wherein the first required oil pressure is the main oil pressure in the main oil circuit corresponding to the automatic transmission. The first required oil pressure is the maximum value among the first main oil pressure, the second main oil pressure, the third main oil pressure and the preset limit main oil pressure. The first main oil pressure is determined based on the input shaft speed, the second main oil pressure is determined based on the input shaft torque and the gear position, and the third main oil pressure is determined according to the second clutch provided with a pressure sensor. The second required oil pressure is the larger of the target required oil pressure and the preset pressure.

[0096] The above implementation scheme determines the main oil pressure in the main oil circuit corresponding to the automatic transmission, i.e., the first required oil pressure, and the second required oil pressure corresponding to the first clutch in the automatic transmission where no pressure sensor is provided, and determines the target opening of the solenoid valve arranged between the main oil circuit and the pressure chamber corresponding to the first solenoid valve according to the first required oil pressure and the second required oil pressure, so that the actual oil pressure entering the pressure chamber of the clutch through the solenoid valve is approximately equal to the second required oil pressure, thereby avoiding the first required oil pressure from performing full pressure control on the clutch, avoiding the clutch from being engaged too tightly and suddenly, and extending the service life of the clutch.

[0097] The hydraulic control method provided in the embodiment of the present application is introduced above, and the hydraulic control device provided in the embodiment of the present application will be introduced below with reference to the accompanying drawings.

[0098] like Figure 3 As shown, an embodiment of the present invention further provides a hydraulic control device, the device comprising:

[0099] A first determination module 301 is used to determine a first required oil pressure corresponding to the automatic transmission, and control the main oil pressure in the main oil circuit corresponding to the automatic transmission according to the first required oil pressure;

[0100] A second determination module 302 is used to determine a second required oil pressure corresponding to a first clutch which is not provided with a pressure sensor;

[0101] The control module 303 is used to determine the target opening of the solenoid valve corresponding to the first clutch according to the first required oil pressure and the second required oil pressure, and control the opening of the solenoid valve to be adjusted to the target opening, wherein the solenoid valve is arranged between the main oil circuit and the pressure chamber corresponding to the first clutch.

[0102] Optionally, the first determining module includes:

[0103] A first acquisition submodule, used to acquire a current input shaft speed, a current input shaft torque and a current gear position corresponding to the automatic transmission;

[0104] A first determining submodule, configured to determine a first main oil pressure according to the current input shaft speed;

[0105] A second determining submodule, configured to determine a second main oil pressure according to the current input shaft torque and the current gear position;

[0106] The third determining submodule is configured to determine a maximum value among the first main oil pressure, the second main oil pressure and a preset limit main oil pressure as the first required oil pressure.

[0107] Optionally, the first determining submodule includes:

[0108] A first acquisition unit, used to acquire a first corresponding relationship between the input shaft speed and the main oil pressure;

[0109] The first determining unit is used to determine a first main oil pressure corresponding to the current input shaft speed according to the first corresponding relationship.

[0110] Optionally, the second determining submodule includes:

[0111] A second acquisition unit, used to acquire a second corresponding relationship between the input shaft torque, the gear position and the main oil pressure;

[0112] The second determining unit is used to determine a second main oil pressure corresponding to the current input shaft torque and the current gear according to the second corresponding relationship.

[0113] Optionally, when the multiple clutches corresponding to the automatic transmission include at least one second clutch provided with a pressure sensor, after determining the maximum value among the first main oil pressure, the second main oil pressure and a preset limit main oil pressure as the first required oil pressure, the first determining module further includes:

[0114] A second acquisition submodule, used to acquire the input end torque, clutch torque ratio, measured clutch gain and preset pressure compensation corresponding to the second clutch;

[0115] a fourth determination submodule, configured to determine a third main oil pressure corresponding to the second clutch according to the input end torque, the clutch torque ratio, the measured clutch gain and the preset pressure compensation;

[0116] A first comparison submodule, configured to compare the third main oil pressure with the first required oil pressure;

[0117] The fifth determination submodule is used to determine the third main oil pressure as the first required oil pressure when the third main oil pressure is greater than the first required oil pressure; and to keep the first required oil pressure unchanged when the third main oil pressure is less than or equal to the first required oil pressure.

[0118] Optionally, the second determining module includes:

[0119] A third acquisition submodule is used to obtain the input end torque, clutch torque ratio, bench-measured clutch gain and preset torque compensation corresponding to the first clutch;

[0120] A sixth determination submodule, for determining a target required oil pressure according to the input end torque, the clutch torque ratio, the bench measured clutch gain and the preset torque compensation;

[0121] A seventh determining submodule is configured to determine the target required oil pressure as the second required oil pressure.

[0122] Optionally, after determining the target required oil pressure as the second required oil pressure, the second determining module further includes:

[0123] A second comparison submodule, used for comparing the target required oil pressure with a preset pressure;

[0124] The eighth determination submodule is used to determine the target demand pressure as the second demand pressure when the target demand oil pressure is greater than the preset pressure; and to determine the preset pressure as the second demand pressure when the target demand oil pressure is less than or equal to the preset pressure.

[0125] The hydraulic control device provided by the present application determines the main oil pressure in the main oil circuit corresponding to the automatic transmission, i.e., the first required oil pressure, and the second required oil pressure corresponding to the first clutch in the automatic transmission where no pressure sensor is provided, and determines the target opening of the solenoid valve arranged between the main oil circuit and the pressure chamber corresponding to the first solenoid valve according to the first required oil pressure and the second required oil pressure, so that the actual oil pressure entering the pressure chamber of the clutch through the solenoid valve is approximately equal to the second required oil pressure, thereby avoiding the first required oil pressure from performing full pressure control on the clutch, avoiding the clutch from being engaged too tightly and suddenly, and extending the service life of the clutch.

[0126] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0127] An embodiment of the present application also provides an electronic device, including: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the various processes of the above-mentioned hydraulic control method embodiment are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0128] For example, Figure 4 FIG. 1 shows a schematic diagram of the physical structure of an electronic device. Figure 4 As shown, the electronic device may include: a processor 410, a communication interface 420, a memory 430 and a communication bus 440, wherein the processor 410, the communication interface 420 and the memory 430 communicate with each other through the communication bus 440. The processor 410 may call the logic instructions in the memory 430, and the processor 410 is used to perform the following steps: determining the first required oil pressure corresponding to the automatic transmission, and controlling the main oil pressure in the main oil circuit corresponding to the automatic transmission according to the first required oil pressure; determining the second required oil pressure corresponding to the first clutch for which a pressure sensor is not provided; determining the target opening of the solenoid valve corresponding to the first clutch according to the first required oil pressure and the second required oil pressure, and controlling the opening of the solenoid valve to be adjusted to the target opening, wherein the solenoid valve is arranged between the main oil circuit and the pressure chamber corresponding to the first clutch. The processor 410 may also perform other schemes in the embodiments of the present application, which will not be further elaborated here.

[0129] In addition, the logic instructions in the above-mentioned memory 430 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application.

[0130] The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, each process of the above-mentioned hydraulic control method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. The computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0131] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0132] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0133] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0134] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the present application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0135] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0136] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0137] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0138] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0139] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0140] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A hydraulic control method, characterized in that: The method comprises: determining a first required oil pressure corresponding to the automatic transmission, and controlling a main oil pressure in a main oil circuit corresponding to the automatic transmission according to the first required oil pressure; For a first clutch not provided with a pressure sensor, determining a second required oil pressure corresponding to the first clutch; According to the first required oil pressure and the second required oil pressure, the target opening of the solenoid valve corresponding to the first clutch is determined, and the opening of the solenoid valve is controlled to be adjusted to the target opening, wherein the solenoid valve is arranged between the main oil circuit and the pressure chamber corresponding to the first clutch.

2. The hydraulic control method according to claim 1, characterized in that: Determining a first required oil pressure corresponding to the automatic transmission includes: Obtaining a current input shaft speed, a current input shaft torque, and a current gear position corresponding to the automatic transmission; determining a first main oil pressure according to the current input shaft speed; determining a second main oil pressure according to the current input shaft torque and the current gear position; The maximum value among the first main oil pressure, the second main oil pressure and a preset limit main oil pressure is determined as the first required oil pressure.

3. The hydraulic control method according to claim 2, characterized in that: Determining the first main oil pressure according to the current input shaft speed includes: Obtaining a first corresponding relationship between input shaft speed and main oil pressure; According to the first corresponding relationship, a first main oil pressure corresponding to the current input shaft speed is determined.

4. The hydraulic control method according to claim 2, characterized in that: Determining the second main oil pressure according to the current input shaft torque and the current gear position includes: Obtaining a second corresponding relationship between input shaft torque, gear position and main oil pressure; According to the second corresponding relationship, a second main oil pressure corresponding to the current input shaft torque and the current gear is determined.

5. The hydraulic control method according to claim 2, characterized in that: When the plurality of clutches corresponding to the automatic transmission include at least one second clutch provided with a pressure sensor, after determining the maximum value among the first main oil pressure, the second main oil pressure and a preset limit main oil pressure as the first required oil pressure, the method further includes: Obtaining input end torque, clutch torque ratio, measured clutch gain and preset pressure compensation corresponding to the second clutch; determining a third main oil pressure corresponding to the second clutch according to the input end torque, the clutch torque ratio, the measured clutch gain and the preset pressure compensation; comparing the third main oil pressure and the first required oil pressure; When the third main oil pressure is greater than the first required oil pressure, determining the third main oil pressure as the first required oil pressure; When the third main oil pressure is less than or equal to the first required oil pressure, the first required oil pressure is kept unchanged.

6. The hydraulic control method according to claim 1, characterized in that: Determining a second required oil pressure corresponding to the first clutch includes: Obtaining the input end torque, clutch torque ratio, bench-measured clutch gain, and preset torque compensation corresponding to the first clutch; Determine the target required oil pressure based on the input torque, clutch torque ratio, bench-measured clutch gain, and preset torque compensation; The target required oil pressure is determined as the second required oil pressure.

7. The hydraulic control method according to claim 6, characterized in that: After determining the target required oil pressure as the second required oil pressure, the method further includes: comparing the target required oil pressure with a preset pressure; When the target required oil pressure is greater than the preset pressure, determining the target required pressure as the second required pressure; When the target required oil pressure is less than or equal to the preset pressure, the preset pressure is determined as the second required pressure.

8. A hydraulic control device, characterized in that: include: a first determining module, configured to determine a first required oil pressure corresponding to the automatic transmission, and to control a main oil pressure in a main oil circuit corresponding to the automatic transmission according to the first required oil pressure; A second determination module is used to determine a second required oil pressure corresponding to a first clutch which is not provided with a pressure sensor; A control module is used to determine the target opening of the solenoid valve corresponding to the first clutch according to the first required oil pressure and the second required oil pressure, and control the opening of the solenoid valve to be adjusted to the target opening, wherein the solenoid valve is arranged between the main oil circuit and the pressure chamber corresponding to the first clutch.

9. An electronic device, characterized in that: The method comprises a processor, a memory and a computer program stored in the memory and executable on the processor, wherein the computer program implements the hydraulic control method according to any one of claims 1 to 7 when executed by the processor.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the hydraulic control method according to any one of claims 1 to 7 is implemented.

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