Clutch hydraulic control system and control method, electronic device, and storage medium

Abstract

The application discloses a kind of clutch hydraulic control system and control method, electronic equipment, storage medium, clutch hydraulic control system includes oil tank, electric oil pump, lubricating oil path, oil supply oil path, pressure relief oil path, clutch hydraulic cylinder and state switching valve;Electric oil pump connects oil tank;Clutch hydraulic cylinder connects oil supply oil path and pressure relief oil path;State switching valve is connected electric oil pump, and state switching valve includes first working position, second working position and third working position;When state switching valve is in first working position, electric oil pump is supplied with oil to lubricating oil path by state switching valve;When state switching valve is in second working position, electric oil pump is supplied with oil to clutch hydraulic cylinder by state switching valve and oil supply oil path;When state switching valve is in the third working position, electric oil pump is supplied with oil to lubricating oil path by state switching valve, and the oil liquid that clutch hydraulic cylinder pressure relief backflow returns oil tank by pressure relief oil path and state switching valve.

Description

Technical Field

[0001] This invention relates to the field of clutch hydraulic control technology, and more specifically, to a clutch hydraulic control system, a control method for the clutch hydraulic control system, an electronic device, a computer-readable storage medium, and a computer program product. Background Technology

[0002] With increasing economic development and environmental pressures, hybrid vehicles have become an important means for the automotive industry to achieve carbon reduction. As hybrid system technology matures and its cost-effectiveness improves, the development of hybrid technology has accelerated. However, this also places higher demands on the reliability of hybrid transmissions. Currently, the automotive industry uses dual-motor hybrid transmissions with wet clutches to achieve parallel mode switching, employing two independent control methods for clutch pressure control and transmission cooling and lubrication. However, this approach has certain problems during use.

[0003] (1) In a system where a single oil pump is used as the hydraulic source, priority must be given to ensuring the oil supply for the pressure control system. The oil used for cooling and lubrication comes from the oil after the pressure is regulated. The power consumption of the oil pump is the product of the control oil pressure and the outlet flow rate, resulting in significant system losses. (2) The usage time of engaging the clutch to enter the engine direct drive mode is greatly reduced, leaving this function idle for a long time, resulting in resource waste. (3) By independently controlling high pressure and distributing lubrication flow, multiple electric oil pumps or control devices are required, which increases the system cost and also increases the space required for the system layout.

[0004] Therefore, simplifying system configuration, improving component utilization, and reducing system costs have become pressing technical challenges that need to be addressed in this field. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a clutch hydraulic control system and control method, electronic equipment and storage medium, to solve the problems of complex system structure and wasteful resource allocation.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] A clutch hydraulic control system includes an oil tank, an electric oil pump, a lubrication oil circuit, an oil supply circuit, a pressure relief oil circuit, a clutch hydraulic cylinder, and a state switching valve. The oil tank stores the hydraulic fluid for the clutch hydraulic control system. The electric oil pump is connected to the oil tank and is used to draw hydraulic fluid from the tank. The clutch hydraulic cylinder is connected to the oil supply circuit and the pressure relief oil circuit. The state switching valve is connected to the electric oil pump and includes a first working position, a second working position, and a third working position. When the state switching valve is in the first working position, the electric oil pump supplies oil to the lubrication oil circuit through the state switching valve. When the state switching valve is in the second working position, the electric oil pump supplies oil to the clutch hydraulic cylinder through the state switching valve and the oil supply circuit. When the state switching valve is in the third working position, the electric oil pump supplies oil to the lubrication oil circuit through the state switching valve, and the hydraulic fluid returning from the clutch hydraulic cylinder due to pressure relief returns to the oil tank through the pressure relief oil circuit and the state switching valve.

[0008] Furthermore, the state switching valve includes a first oil port connected to the oil supply circuit, a second oil port connected to the lubrication circuit, a third oil port and a fourth oil port connected to the pressure relief circuit, and a fifth oil port connected to the output end of the electric oil pump; in the first working position, the fifth oil port is unidirectionally open to the second oil port, and the first, third, and fourth oil ports are closed; in the second working position, the fifth oil port is unidirectionally open to the first oil port, and the second, third, and fourth oil ports are closed; in the third working position, the fifth oil port is unidirectionally open to the second oil port, the third oil port is unidirectionally open to the fourth oil port, and the first oil port is closed.

[0009] Furthermore, the fourth oil port is connected to the oil tank.

[0010] Furthermore, the clutch hydraulic control system also includes a return oil circuit and a safety valve. The safety valve is located on the return oil circuit, which connects the supply oil circuit and the lubrication oil circuit. When the pressure in the supply oil circuit reaches the opening pressure of the safety valve, the safety valve opens, and the oil in the supply oil circuit flows into the lubrication oil circuit through the safety valve.

[0011] Furthermore, the clutch hydraulic control system also includes a throttle orifice, which is located in the pressure relief oil line to buffer the oil flowing into the pressure relief oil line.

[0012] Furthermore, the clutch hydraulic control system also includes a check valve, which is located in the oil supply line to prevent the oil flowing into the clutch hydraulic cylinder from flowing in the reverse direction.

[0013] Furthermore, the clutch hydraulic control system also includes a pressure-holding accumulator, which is connected to the oil supply circuit. The pressure-holding accumulator is used to replenish oil to the clutch hydraulic cylinder through the oil supply circuit when the pressure in the clutch hydraulic cylinder decreases.

[0014] This application embodiment also provides a control method for a clutch hydraulic control system. The clutch hydraulic control system includes an oil tank for storing hydraulic fluid; an electric oil pump connected to the oil tank for drawing fluid from the tank; a lubrication circuit, a supply circuit, and a pressure relief circuit; a clutch hydraulic cylinder connected to the supply circuit and the pressure relief circuit; and a state switching valve connected to the electric oil pump, the state switching valve including a first working position, a second working position, and a third working position. The control method includes: when a transmission cooling and lubrication command is received, controlling the input current in the state switching valve to a first preset current value, so that the state switching valve is in the first working position, and the electric oil pump... Oil is supplied to the lubrication circuit through a state switching valve; when a clutch engagement command is received, the current in the state switching valve is increased to a second preset current value, so that the state switching valve is in the second working position, and the electric oil pump supplies oil to the clutch hydraulic cylinder through the state switching valve and the oil supply circuit; when a clutch disengagement command is received, the current in the state switching valve is increased to a third preset current value, so that the state switching valve is in the third working position, the electric oil pump supplies oil to the lubrication circuit through the state switching valve, and receives the oil discharged from the clutch hydraulic cylinder through the pressure relief circuit and the state switching valve; wherein the first preset current value is 0, and the second preset current value is less than the third preset current value.

[0015] Furthermore, the control method also includes: when the oil in the clutch hydraulic cylinder in the clutch hydraulic control system is depressurized and flows back through the pressure relief oil circuit and the state switching valve, the current in the state switching valve is reduced to a first preset current value so that the state switching valve is in the first working position.

[0016] Furthermore, the control method also includes: when the duration of the second preset current value reaches a preset time, the current in the control input state switching valve is reduced to the first preset current value, so that the state switching valve is in the first working position.

[0017] This application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the control method of the above-mentioned clutch hydraulic control system.

[0018] This application also provides a computer-readable storage medium storing a computer program, the calculation of which can be executed by a processor to complete the control method of the clutch hydraulic control system provided in this application.

[0019] This application also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements a control method for a clutch hydraulic control system.

[0020] The beneficial effects of the embodiments of the present invention are:

[0021] First, this application provides a clutch hydraulic control system, which is equipped with a state switching valve and an electric oil pump connected to the oil supply circuit, lubrication circuit and pressure relief circuit, and a return oil circuit. In conjunction with the components in each oil circuit, the clutch pressure control and large flow oil supply are divided into different time periods by controlling the working position of the state switching valve. The system has a simple structure, is easy to operate, and improves the system's working efficiency.

[0022] Secondly, this application sets up a state switching valve, and controls the current input to the state switching valve to control the system to realize three working modes: cooling and lubrication, rapid oil supply to the clutch and then entering the lubrication circuit through the safety valve, and rapid pressure relief of the clutch hydraulic cylinder. This improves the utilization rate of system components and reduces system cost. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly described below.

[0024] Figure 1 This is a schematic diagram of the structure of a clutch hydraulic control system according to an embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the state switching valve of the clutch hydraulic control system in the first working position according to an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the state switching valve of the clutch hydraulic control system in the second working position, as shown in an embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the state switching valve of the clutch hydraulic control system in the third working position, as shown in an embodiment of this application.

[0028] Figure 5 This is a schematic diagram of the one-way valve, safety valve, and throttle orifice of a clutch hydraulic control system according to an embodiment of this application;

[0029] Figure 6 This is a flowchart illustrating a control method for a clutch hydraulic control system according to an embodiment of this application.

[0030] Attached reference numerals: 1-oil tank; 11-filter; 2-electric oil pump; 3-lubricating oil circuit; 4-oil supply circuit; 41-check valve; 5-pressure relief circuit; 51-throttle orifice; 6-clutch hydraulic cylinder; 7-state switching valve; 71-first oil port; 72-second oil port; 73-third oil port; 74-fourth oil port; 75-fifth oil port; 8-return oil circuit; 81-safety valve; 9-pressure accumulator. Detailed Implementation

[0031] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] The purpose of this invention is to provide a clutch hydraulic control system to solve the problems of complex system configuration and wasteful resource allocation.

[0033] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0034] See Figure 1 , 3 4. The clutch hydraulic control system includes an oil tank 1, an electric oil pump 2, a lubricating oil circuit 3, an oil supply circuit 4, a pressure relief circuit 5, a clutch hydraulic cylinder 6, and a state switching valve 7.

[0035] The oil tank 1 is used to store the oil of the clutch hydraulic control system. The input end of the electric oil pump 2 is connected to the oil tank 1 and is used to draw oil from the oil tank 1. The clutch hydraulic cylinder 6 is connected to one end of the oil supply line 4 and one end of the pressure relief line 5. The other end of the oil supply line 4 is connected to the output end of the electric oil pump 2. The oil drawn by the electric oil pump 2 from the oil tank 1 can flow into the clutch hydraulic cylinder 6 through the oil supply line 4.

[0036] The state switching valve 7 is connected to the output end of the electric oil pump 2. Specifically, the state switching valve 7 is set between the electric oil pump 2 and the oil supply line 4, and the state switching valve 7 can be connected to the electric oil pump 2 and the oil supply line 4.

[0037] The state switching valve 7 has three stable operating states, corresponding to three operating positions: the first operating position, the second operating position, and the third operating position. These positions are located at the right, center, and left sides of the state switching valve 7, respectively. When the state switching valve 7 is in the first operating position (i.e., Figure 1(as shown in the image) The electric oil pump 2 supplies oil to the lubrication circuit 3 through the state switching valve 7; when the state switching valve 7 is in the second working position (i.e., Figure 3 (as shown in the image) The electric oil pump 2 supplies oil to the clutch hydraulic cylinder 6 through the state switching valve 7 and the oil supply line 4; when the state switching valve 7 is in the third working position (i.e., Figure 4 (As shown in the figure), the electric oil pump 2 supplies oil to the lubrication circuit 3 through the state switching valve 7, and the oil that is depressurized and flows back from the clutch hydraulic cylinder 6 returns to the oil tank 1 through the depressurization oil circuit 5 and the state switching valve 7.

[0038] In this embodiment, the lubrication oil circuit 3, the oil supply circuit 4, and the pressure relief oil circuit 5 are located in the same clutch, and the above oil circuits are connected by only one electric oil pump 2 and a state switching valve 7. The functions of oil supply, cooling lubrication, and pressure relief return of the clutch hydraulic control system are realized by only one state switching valve 7.

[0039] On the one hand, it reduces the number of state switching valves 7 used for function switching, which helps to reduce the overall size and lower costs. On the other hand, it makes full use of the fact that the hybrid system does not have high requirements for clutch pressure control accuracy and the characteristics of the cooling and lubrication system itself, such as heat capacity and flow inertia. Combined with specific control methods, it realizes a scheme for clutch pressure control and lubrication flow distribution, which greatly simplifies the system structure, improves the utilization rate of parts, and reduces system costs.

[0040] See Figure 2 -4. Specifically, in this embodiment, the state switching valve 7 is a three-position five-way valve, which has multiple working states. Applying it to the clutch hydraulic control system in this application can improve the utilization rate of system components.

[0041] The state switching valve 7 includes three valve assemblies (which can be referred to as the first valve assembly, the second valve assembly, and the third valve assembly from right to left). Each valve assembly includes a first oil port 71, a second oil port 72, a third oil port 73, a fourth oil port 74, and a fifth oil port 75.

[0042] The first oil port 71 is connected to the oil supply line 4, the second oil port 72 is connected to the lubrication line 3, the third oil port 73 is connected to the pressure relief line 5, the fourth oil port 74 is connected to the oil tank 1, and the fifth oil port 75 is connected to the output end of the electric oil pump 2.

[0043] For details, see Figure 2 When the state switching valve 7 is in the first working position, the electric oil pump 2 is connected to the first valve assembly. The fifth oil port 75 of the first valve assembly is unidirectionally open to the second oil port 72, and the first oil port 71, the third oil port 73 and the fourth oil port 74 are closed. At this time, the oil pumped by the electric oil pump 2 can flow into the lubrication oil passage 3 connected to the cooling and lubrication components through the fifth oil port 75 and the second oil port 72.

[0044] See Figure 3 When the state switching valve 7 is in the second working position, the electric oil pump 2 is connected to the second valve assembly. The fifth oil port 75 of the second valve assembly is unidirectionally open to the first oil port 71, while the second oil port 72, the third oil port 73 and the fourth oil port 74 are closed. At this time, the oil pumped by the electric oil pump 2 can flow into the oil supply line 4 connected to the clutch hydraulic cylinder 6 through the fifth oil port 75 and the first oil port 71.

[0045] See Figure 4 When the state switching valve 7 is in the third working position, the electric oil pump 2 is connected to the third valve assembly. The fifth oil port 75 of the third valve assembly is unidirectionally connected to the second oil port 72, and the third oil port 73 is unidirectionally connected to the fourth oil port 74. The first oil port 71 is closed. At this time, the oil pumped by the electric oil pump 2 can supply oil to the lubrication oil circuit 3 connected to the cooling and lubrication components through the third oil port 73 and the fourth oil port 74. The oil that is depressurized and flows back from the clutch hydraulic cylinder 6 flows back to the oil tank 1 through the depressurization oil circuit 5 along the third oil port 73 and the fourth oil port 74.

[0046] See Figure 5 The clutch hydraulic control system also includes a return oil circuit 8, a safety valve 81, and a check valve 41.

[0047] One-way valve 41 is provided on oil supply line 4. Specifically, the inlet end of one-way valve 41 is provided on the side of oil supply line 4 near state switching valve 7, and the outlet end of one-way valve 41 is provided on the side of oil supply line 4 near clutch hydraulic cylinder 6. It is used to prevent the oil flowing from oil supply line 4 into clutch hydraulic cylinder 6 through state switching valve 7 from flowing back to one end of state switching valve 7.

[0048] Safety valve 81 is installed on the return oil passage 8, which is connected to the supply oil passage 4 and the lubrication oil passage 3. Specifically, one end of the return oil passage 8 is connected to the supply oil passage 4 on one side of the outlet end of the check valve 41, and the other end is connected to the lubrication oil passage 3. When the pressure in the supply oil passage 4 reaches a certain value, safety valve 81 opens, and some of the oil in the supply oil passage 4 can flow into the lubrication oil passage 3 through safety valve 81.

[0049] Specifically, when the pressure in the oil supply circuit 4, that is, the filling pressure, reaches the opening pressure of the safety valve 81, the safety valve 81 opens, and the oil in the oil supply circuit 4 flows into the lubrication circuit 3 through the safety valve 81 to ensure that the electric oil pump 2 does not experience a stall condition.

[0050] The aforementioned safety valve 81 is closed when the oil filling pressure does not reach the opening pressure, preventing oil from entering the lubrication circuit 3 through the safety valve 81 when oil is supplied to the clutch hydraulic cylinder 6.

[0051] In this embodiment, the clutch hydraulic control system also includes a throttle orifice 51, which is disposed on the pressure relief oil passage 5 and is used to buffer the oil in the pressure relief oil passage 5.

[0052] The clutch hydraulic control system also includes a pressure holding accumulator 9, which is connected to the oil supply line 4. Specifically, the pressure holding accumulator 9 is connected to the outlet end of the oil supply line 4 and is connected to the clutch hydraulic cylinder 6. When the pressure in the clutch hydraulic cylinder 6 decreases, the pressure holding accumulator 9 can replenish oil to the clutch hydraulic cylinder 6 through the oil supply line 4.

[0053] The clutch hydraulic control system also includes a filter 11, which is connected between the electric oil pump 2 and the oil tank 1 to filter out residual contaminants in the oil tank 1 and protect the electric oil pump 2.

[0054] According to another aspect of the present invention, a control method for a clutch hydraulic control system is provided. This control method can be applied to the above-described clutch hydraulic control system or to a hybrid vehicle employing the above-described clutch hydraulic control system. The specific structure of the clutch hydraulic control system can be found in the description above. The control method is used to receive instructions sent by the vehicle and, according to the instructions, control the electric oil pump 2 and control the current in the input state switching valve 7 to control the state switching valve 7 to operate, thereby realizing clutch pressure control and lubrication flow distribution time-sharing control.

[0055] Furthermore, the state switching valve 7 in this embodiment has a first working position, a second working position, and a third working position, corresponding to a first preset current value, a second preset current value, and a third preset current value for the control current.

[0056] Specifically, such as Figure 6 As shown, the control method includes:

[0057] Step S610: When a transmission cooling and lubrication command is received, the current in the control input state switching valve 7 is set to a first preset current value, so that the state switching valve 7 is in the first working position, that is, the state switching valve 7 enters the right-hand position working state (see...). Figure 2 The electric oil pump 2 supplies oil to the lubrication circuit 3 through the state switching valve 7, wherein the first preset current value is equal to 0.

[0058] In the above working state, after the oil is pressurized by the electric oil pump 2, it flows directly into the lubrication oil circuit 3 from the fifth oil port 75 and the second oil port 72, simply to realize the cooling and lubrication function of the clutch hydraulic control system, so as to ensure that the electric oil pump 2 has the lowest outlet pressure when the oil is output at a large flow rate.

[0059] Step S620: When a clutch engagement command is received, the current in the control input state switching valve 7 increases to a second preset current value, so that the state switching valve 7 is in the second operating position, that is, the state switching valve 7 enters the intermediate position operating state (see...). Figure 3 The electric oil pump 2 supplies oil to the clutch hydraulic cylinder 6 through the state switching valve 7 and the oil supply line 4.

[0060] In the above working state, all the outlet oil of the electric oil pump 2 enters the clutch hydraulic cylinder 6 and the pressure accumulator 9 through the fifth oil port 75, the first oil port 71 and the oil supply line 4. The pressure in the clutch hydraulic cylinder 6 continues to rise, eventually causing the clutch connected to the clutch hydraulic cylinder 6 to enter the engaged state. At this time, the electric oil pump 2 continues to work to supply oil to the oil supply line 4 connected to the clutch hydraulic cylinder 6.

[0061] When the pressure in the oil supply circuit 4 continues to rise until it reaches the opening pressure of the safety valve 81, the filling pressure can no longer be increased. At this time, the safety valve 81 opens, and the excess oil in the oil supply circuit 4 enters the lubrication circuit 3 through the safety valve 81 to ensure that the electric oil pump 2 does not experience a stall condition.

[0062] When the duration of the second preset current value reaches the preset time, the current in the control input state switching valve 7 is reduced to the first preset current value, so that the state switching valve 7 is in the first working position.

[0063] Among them, the preset time refers to the maximum value t of the end time of oil supply to the clutch hydraulic cylinder 6, obtained by using limit samples and performance calibration work, under the condition that the performance of the clutch hydraulic control system is basically consistent.

[0064] After the aforementioned state switching valve 7 is in the first working position, the pressure of the clutch hydraulic cylinder 6 will continuously decrease due to the pressure relief. At this time, the pressure holding accumulator 9 can replenish oil into the clutch hydraulic cylinder 6 to minimize the rate at which the pressure of the clutch hydraulic cylinder 6 decreases.

[0065] When the pressure inside the clutch hydraulic cylinder 6 drops below the threshold p, the clutch will be unable to transmit torque sufficiently and slippage will occur. At this time, the timing for resupplying oil to the clutch hydraulic cylinder 6 can be determined by monitoring the clutch slip.

[0066] The above process allows us to obtain the maximum value of the end time of oil supply to the clutch hydraulic cylinder 6 and the timing of resupply, thereby improving efficiency and reducing costs.

[0067] Step S630: When a clutch disengagement command is received, the current in the control input state switching valve 7 increases to a third preset current value, so that the state switching valve 7 is in the third operating position (see...). Figure 4The electric oil pump 2 supplies oil to the lubrication circuit 3 through the state switching valve 7, and receives the oil discharged from the clutch hydraulic cylinder 6 through the pressure relief circuit 5 and the state switching valve 7.

[0068] In the above working state, the oil in the clutch hydraulic cylinder 6 is depressurized and flows back to the oil tank through the throttle hole 51 on the pressure relief oil circuit 5 and the connected third oil port 73 and fourth oil port 74. The electric oil pump 2 draws the oil in the oil tank 1 and enters the lubrication oil circuit 3 through the fifth oil port 75 and the second oil port 72, ensuring the system heat dissipation while meeting the system's cooling and lubrication requirements.

[0069] The third preset current value is greater than the second preset current value.

[0070] When the state switching valve 7 is in the first working position, the fifth oil port 75 and the first oil port 71 connected to the inlet of the clutch hydraulic cylinder 6 are closed. The oil in the clutch hydraulic cylinder 6 basically maintains the pressure of other states before switching to this position. However, due to the existence of the sealing gap, the pressure in the clutch hydraulic cylinder 6 will tend to 0 if the time is long enough. In order to ensure reliable clutch disengagement, the clutch hydraulic cylinder 6 needs to be depressurized in the state before switching to this state. Therefore, when the state switching valve 7 is in the third working position, the clutch hydraulic cylinder 6 is depressurized and returned through the depressurization oil passage 5.

[0071] When the oil in the clutch hydraulic cylinder 6 in the clutch hydraulic control system is depressurized and flows back through the pressure relief oil circuit 5 and the state switching valve 7, the current in the control input state switching valve 7 is reduced to the first preset current value, so that the state switching valve 7 is in the first working position and only realizes the cooling and lubrication function.

[0072] By switching the three states of the clutch hydraulic control system through the state switching valve 7, a single electric oil pump 2 can meet the switching requirements of various hybrid modes of the vehicle without complex control. This application improves the utilization rate of the electric oil pump 2, greatly simplifies the system structure, and reduces costs.

[0073] The present invention also provides an electronic device, which may include a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the control method of the clutch hydraulic control system described above.

[0074] The present invention also provides a computer-readable storage medium storing a computer program that can be executed by a processor to perform the control method of the clutch hydraulic control system described in the above embodiments.

[0075] The present invention also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the control method of the clutch hydraulic control system described above.

[0076] In the embodiments provided in this application, it should be understood that the disclosed control systems and methods can also be implemented in other ways. The control system embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functions, and operations of possible implementations of the control systems, methods, and computer program products according to this application. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or part of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0077] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0078] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0079] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A hydraulic control system for a clutch, characterized by, The clutch hydraulic control system comprises: an oil tank for storing oil of the clutch hydraulic control system; an electric oil pump connected to the oil tank for pumping oil in the oil tank; a lubricating oil passage, an oil supply passage and a pressure relief oil passage; a clutch hydraulic cylinder connected to the oil supply passage and the pressure relief oil passage; a state switching valve connected to the electric oil pump, the state switching valve comprising a first working position, a second working position and a third working position, the oil supply passage being arranged between the state switching valve and the clutch hydraulic cylinder; when the state switching valve is in the first working position, the electric oil pump supplies oil to the lubricating oil passage through the state switching valve; when the state switching valve is in the second working position, the electric oil pump supplies oil to the clutch hydraulic cylinder through the state switching valve and the oil supply passage; when the state switching valve is in the third working position, the electric oil pump supplies oil to the lubricating oil passage through the state switching valve, and the clutch hydraulic cylinder returns oil back to the oil tank through the pressure relief oil passage and the state switching valve; wherein the state switching valve comprises a first oil port connected to the oil supply passage, a second oil port connected to the lubricating oil passage, a third oil port connected to the pressure relief oil passage, a fourth oil port and a fifth oil port connected to an output end of the electric oil pump, the fourth oil port being connected to the oil tank; in the first working position, the fifth oil port is unidirectionally communicated to the second oil port, and the first oil port, the third oil port and the fourth oil port are closed; in the second working position, the fifth oil port is unidirectionally communicated to the first oil port, and the second oil port, the third oil port and the fourth oil port are closed; in the third working position, the fifth oil port is unidirectionally communicated to the second oil port, and the third oil port is unidirectionally communicated to the fourth oil port, and the first oil port is closed; the clutch hydraulic control system further comprises an oil return passage and a safety valve arranged on the oil return passage, the oil return passage being connected to the oil supply passage and the lubricating oil passage, and when the pressure in the oil supply passage reaches an opening pressure of the safety valve, the safety valve is opened, and oil in the oil supply passage flows into the lubricating oil passage through the safety valve.

2. The clutch hydraulic control system according to claim 1, characterized by, The clutch hydraulic control system further comprises a throttle hole arranged on the pressure relief oil passage for buffering oil flowing into the pressure relief oil passage.

3. The clutch hydraulic control system according to claim 1, characterized by, The clutch hydraulic control system further comprises a check valve arranged on the oil supply passage for preventing oil flowing into the clutch hydraulic cylinder from flowing reversely.

4. The clutch hydraulic control system of claim 1, wherein The clutch hydraulic control system further comprises a pressure maintaining accumulator connected to the oil supply passage, the pressure maintaining accumulator being used for supplementing oil into the clutch hydraulic cylinder through the oil supply passage when the pressure in the clutch hydraulic cylinder is reduced.

5. A control method of a clutch hydraulic control system characterized by, The clutch hydraulic control system comprises an oil tank for storing oil of the clutch hydraulic control system, an electric oil pump connected to the oil tank for pumping oil in the oil tank, a lubricating oil path, an oil supply path and a pressure relief oil path, a clutch hydraulic cylinder connected to the oil supply path and the pressure relief oil path, and a state switching valve connected to the electric oil pump, the state switching valve comprising a first working position, a second working position and a third working position, the oil supply path being arranged between the state switching valve and the clutch hydraulic cylinder. When receiving a transmission cooling and lubricating instruction, the electric current input into the state switching valve is controlled to be a first preset current value, so that the state switching valve is in the first working position, and the electric oil pump supplies oil to the lubricating oil path through the state switching valve. When receiving a clutch engagement instruction, the electric current input into the state switching valve is controlled to be a second preset current value, so that the state switching valve is in the second working position, and the electric oil pump supplies oil to the clutch hydraulic cylinder through the state switching valve and the oil supply path. When receiving a clutch disengagement instruction, the electric current input into the state switching valve is controlled to be a third preset current value, so that the state switching valve is in the third working position, the electric oil pump supplies oil to the lubricating oil path through the state switching valve, and receives oil backflow from the clutch hydraulic cylinder through the pressure relief oil path and the state switching valve. The first preset current value is 0, and the second preset current value is less than the third preset current value. The state switching valve comprises a first oil port connected to the oil supply path, a second oil port connected to the lubricating oil path, a third oil port connected to the pressure relief oil path, a fourth oil port and a fifth oil port connected to the output end of the electric oil pump, the fourth oil port being connected to the oil tank. In the first working position, the fifth oil port is unidirectionally communicated to the second oil port, and the first oil port, the third oil port and the fourth oil port are closed. In the second working position, the fifth oil port is unidirectionally communicated to the first oil port, and the second oil port, the third oil port and the fourth oil port are closed. In the third working position, the fifth oil port is unidirectionally communicated to the second oil port, and the third oil port is unidirectionally communicated to the fourth oil port, and the first oil port is closed. The clutch hydraulic control system further comprises an oil return path and a safety valve arranged on the oil return path, the oil return path being connected to the oil supply path and the lubricating oil path, so that when the pressure in the oil supply path reaches the opening pressure of the safety valve, the safety valve is opened, and the oil in the oil supply path flows into the lubricating oil path through the safety valve.

6. The control method of the clutch hydraulic control system according to claim 5, characterized by, The control method further comprises: After the oil in the clutch hydraulic cylinder of the clutch hydraulic control system backflows through the pressure relief oil path and the state switching valve, the electric current input into the state switching valve is controlled to be the first preset current value, so that the state switching valve is in the first working position.

7. The control method of the clutch hydraulic control system according to claim 6, characterized by The control method further comprises: When the duration of the second preset current value reaches a preset time, a current input into the state switching valve is reduced to a first preset current value, so that the state switching valve is in the first working position.

8. An electronic device, comprising: A computer program product comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the control method of any one of claims 5-7 when executing the computer program.

9. A computer-readable storage medium, characterized in that, The storage medium stores a computer program executable by the processor to complete the control method of any one of claims 5-7.

10. A computer program product comprising computer programs / instructions, characterized in that, The computer program / instruction is executed by the processor to implement the control method of any one of claims 5-7.

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