DHT transmission hydraulic control system and vehicle

Abstract

The present application provides a DHT transmission hydraulic control system and vehicle. The DHT transmission hydraulic control system includes: a first oil circuit, a second oil circuit, a third oil circuit, an electronic pump, a first regulating valve module, a second regulating valve module, and a controller. The first oil circuit is provided with an electronic pump, and the first regulating valve module is controlled by the controller. The electronic pump is used to pump hydraulic oil from the vehicle's fuel tank to the first oil circuit, the second oil circuit is used to transfer hydraulic oil to the vehicle's clutch, and the third oil circuit is used to transfer hydraulic oil to the vehicle's cooling and lubricating injectors. The controller is used to control the first regulating valve module to a first or second gating state based on the pressure value in the second oil circuit when the clutch is in an operating state. The first gating state instructs the electronic pump to transfer hydraulic oil to the second oil circuit, and the second gating state instructs the electronic pump to transfer hydraulic oil to the third oil circuit. The present application can reduce the production cost of DHT transmissions.

Description

Technical Field

[0001] The present application relates to the technical field of DHT transmissions, and in particular to a DHT transmission hydraulic control system and a vehicle. Background Art

[0002] With the continuous development of vehicle technology, hybrid vehicles combine the advantages of fuel vehicles and pure electric vehicles. As vehicle emission requirements continue to increase, major manufacturers are investing more and more in the research and development of hybrid transmissions.

[0003] Currently, most mass-produced dedicated hybrid transmission (DHT) transmission hydraulic systems use a dual-pump structure: one pump acts as an actuator to build oil pressure, and the other acts as a lubrication pump for lubrication and cooling. However, this dual-pump structure is expensive and unsuitable for mass production. Summary of the Invention

[0004] The embodiments of the present application provide a DHT transmission hydraulic control system and a vehicle to solve the problem of high cost of the current DHT transmission hydraulic system adopting a dual-pump structure.

[0005] In a first aspect, an embodiment of the present application provides a DHT transmission hydraulic control system, comprising a first oil circuit, a second oil circuit, a third oil circuit, an electronic pump, a first regulating valve module, a second regulating valve module, and a controller; the first oil circuit is provided with an electronic pump, the second regulating valve module is connected to the second oil circuit, and the first regulating valve module is controlled by the controller;

[0006] The first regulating valve module has a first end connected to the electronic pump, a second end connected to the second oil circuit and the first end of the second regulating valve module respectively, and a third end connected to the third oil circuit; the electronic pump is used to pump hydraulic oil from the vehicle's fuel tank to the first oil circuit, the second oil circuit is used to transmit hydraulic oil to the vehicle's clutch, and the third oil circuit is used to transmit hydraulic oil to the vehicle's cooling and lubricating oil injectors;

[0007] a controller configured to control the first regulating valve module to be in a first gating state or a second gating state according to a pressure value of the second oil circuit when the clutch is in an operating state; wherein the first gating state is used to instruct the electronic pump to transfer hydraulic oil to the second oil circuit, and the second gating state is used to instruct the electronic pump to transfer hydraulic oil to the third oil circuit;

[0008] The controller is also used to control the second regulating valve module to be in a pressure maintaining state or a pressure relief state according to whether the clutch is in a working state; wherein the pressure maintaining state is used to indicate that the second oil circuit maintains pressure, and the pressure relief state is used to indicate that the second oil circuit releases pressure.

[0009] In a possible implementation, controlling the first regulating valve module to be in the first gating state or the second gating state according to the pressure value of the second oil circuit includes:

[0010] When the pressure value does not reach the specified pressure value, controlling the first regulating valve module to be in the first gating state;

[0011] When the pressure value reaches the specified pressure value, the first regulating valve module is controlled to be in the second gating state.

[0012] In a possible implementation, the first regulating valve module includes a first one-way valve and a reversing valve; the reversing valve is controlled by a controller;

[0013] a first one-way valve, the input end of which is connected to the first end of the first regulating valve module, and the output end of which is connected to the first end of the reversing valve;

[0014] a reversing valve, a second end of which is connected to the second end of the first regulating valve module, and a third end of which is connected to the third end of the first regulating valve module;

[0015] When the first regulating valve module is in the first selection state, the first end of the reversing valve and the second end of the reversing valve are connected; when the first regulating valve module is in the second selection state, the first end of the reversing valve and the third end of the reversing valve are connected.

[0016] In one possible implementation, the following steps are included:

[0017] a second regulating valve module, wherein the second end is connected to the clutch, and the oil drain port is connected to the fuel tank of the vehicle;

[0018] When the second regulating valve module is in a pressure relief state, the hydraulic oil in the second oil circuit flows into the oil tank through the oil drain port of the second regulating valve module.

[0019] In a possible implementation, controlling the second regulating valve module to be in a pressure maintaining state or a pressure releasing state according to whether the clutch is in an operating state includes:

[0020] When the clutch is in the working state, controlling the second regulating valve module to be in the pressure maintaining state;

[0021] When the clutch is not in the working state, the second regulating valve module is controlled to be in the pressure relief state.

[0022] In a possible implementation, the controller is further configured to, after controlling the first regulating valve module to be in the second gating state:

[0023] If the pressure holding time of the second oil circuit reaches a preset time, the first regulating valve module is controlled to switch to the first gating state to replenish oil to the second oil circuit;

[0024] After the second oil circuit is replenished with oil, if the pressure value of the second oil circuit reaches a preset pressure value, the first regulating valve module is controlled to switch back to the second gating state.

[0025] In a possible implementation, the second regulating valve module includes a second one-way valve and a closing valve;

[0026] a second one-way valve, the input end of which is connected to the first end of the second regulating valve module, and the output end of which is respectively connected to the second end of the second regulating valve module and the first end of the closing valve; the second end of the closing valve is connected to the third end of the second regulating valve module;

[0027] Among them, when the first end of the closing valve and the second end of the closing valve are not connected, the second regulating valve module is in a pressure maintaining state; when the first end of the closing valve and the second end of the closing valve are connected, the second regulating valve module is in a pressure relief state.

[0028] In a possible implementation, the system further includes an accumulator and a pressure sensor; the accumulator and the pressure sensor are both arranged in the second oil circuit;

[0029] an accumulator, used to stabilize the pressure value of the hydraulic oil in the second oil circuit within a preset range;

[0030] The pressure sensor is connected to the accumulator and is used to send the pressure value of the accumulator to the controller as the pressure value of the second oil circuit.

[0031] In one possible implementation, the system further includes a filter press;

[0032] The filter press is arranged in the third oil circuit, with a first end connected to the third end of the first regulating valve module and a second end used for connecting to the cooling and lubricating oil injection nozzle of the automobile.

[0033] In a second aspect, an embodiment of the present application provides a vehicle, comprising any one of the DHT transmission hydraulic control systems of the first aspect, further comprising a cooling and lubricating oil injector, a suction filter, and an oil tank;

[0034] The cooling and lubricating oil nozzle is connected to the output end of the third oil circuit and is used to cool and lubricate the parts of the car;

[0035] The suction filter is connected between the oil tank and the electronic pump and is used to filter the hydraulic oil in the oil tank.

[0036] An embodiment of the present application provides a DHT transmission hydraulic control system and a vehicle, including a first oil circuit, a second oil circuit, a third oil circuit, an electronic pump, a first regulating valve module and a controller; an electronic pump is provided on the first oil circuit, and the first regulating valve module is controlled by the controller; the first regulating valve module is controlled by the controller to be in a first selection state or a second selection state according to the pressure value of the second oil circuit; the hydraulic oil extracted by the electronic pump is transferred to the second oil circuit or the third oil circuit to complete the control of the clutch and the cooling of the vehicle parts, without the need for a dual pump structure, thereby reducing costs while ensuring the operating stability of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] Figure 1 This is a structural diagram of a DHT transmission hydraulic control system provided by an embodiment of the present application;

[0039] Figure 2 This is a schematic structural diagram of another DHT transmission hydraulic control system provided in an embodiment of the present application;

[0040] Figure 3 This is a structural diagram of another DHT transmission hydraulic control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] To help those skilled in the art better understand this solution, the following will clearly describe the technical solutions in the embodiments of this solution in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of this solution, not all of it. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of this solution.

[0042] Throughout the specification, claims, and accompanying figures of this solution, the term "including" and any variations thereof mean "including but not limited to," and are intended to cover non-exclusive inclusions and are not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish between different objects, not to describe a specific order.

[0043] The following is a detailed description of the implementation of this application with reference to the accompanying drawings:

[0044] As the country's requirements for automobile economy and emissions become increasingly higher, major OEMs and parts manufacturers are investing more and more in the research and development of hybrid transmission architectures.

[0045] The hydraulic system of the DHT transmission currently in mass production uses an electronic pump as the actuator pump with a small displacement, which can establish a relatively high oil pressure to control the clutch; at the same time, it uses an electronic pump as the lubrication pump with a large displacement, which can provide a larger flow rate. The dual-pump system is more expensive.

[0046] To solve the above problems, an embodiment of the present application proposes a DHT transmission hydraulic control system. Figure 1 This is a structural diagram of a DHT transmission hydraulic control system provided by an embodiment of the present application. Figure 1 The DHT transmission hydraulic control system 10 includes a first oil circuit A, a second oil circuit B, a third oil circuit C, an electronic pump 11, a first regulating valve module 12, a controller 13 and a second regulating valve module 14; the second regulating valve module 14 is connected to the second oil circuit B, the first oil circuit A is provided with an electronic pump 11, and the first regulating valve module 12 and the second regulating valve module 14 are controlled by the controller 13.

[0047] The first regulating valve module 12 has a first end connected to the electronic pump 11, a second end connected to the second oil circuit B and the first end of the second regulating valve module 14 respectively, and a third end connected to the third oil circuit C; the electronic pump 11 is used to draw hydraulic oil from the vehicle's fuel tank 21 to the first oil circuit A, the second oil circuit B is used to transfer hydraulic oil to the vehicle's clutch 22, and the third oil circuit C is used to transfer hydraulic oil to the vehicle's cooling and lubricating oil injectors 23.

[0048] The controller 13 is used to control the first regulating valve module 12 to be in the first selection state or the second selection state according to the pressure value of the second oil circuit B when the clutch 22 is in the working state; wherein the first selection state is used to instruct the electronic pump 11 to transfer the hydraulic oil to the second oil circuit B, and the second selection state is used to instruct the electronic pump 11 to transfer the hydraulic oil to the third oil circuit C.

[0049] The controller 13 is also used to control the second regulating valve module 14 to be in a pressure maintaining state or a pressure releasing state according to whether the clutch 22 is in a working state; wherein the pressure maintaining state is used to indicate that the second oil circuit B maintains pressure, and the pressure releasing state is used to indicate that the second oil circuit B releases pressure.

[0050] The electronic pump 11 can be directly controlled by the controller 13 or another controller. The electronic pump 11 is primarily used to draw hydraulic oil from the vehicle's fuel tank 21 and then establish oil pressure using the speed of the electronic pump 11. The fuel tank 21 can be the vehicle's oil pan, which is used to store engine oil (lubricating oil) and is a closed crankcase.

[0051] The first regulating valve module 12 is controlled by the controller 13 and has two selector states: a first selector state connecting the first oil circuit A with the second oil circuit B, and a second selector state connecting the first oil circuit A with the third oil circuit C. The second oil circuit B is used to supply hydraulic oil to the clutch 22 for tightening during operation, while the third oil circuit C is used to supply hydraulic oil to the cooling and lubricating oil nozzles 23 for cooling and lubricating vehicle parts. There can be multiple cooling and lubricating oil nozzles, each providing cooling and lubricating services for bearings, gears, clutches, or other vehicle parts.

[0052] The controller 13 may obtain the pressure value of the second oil circuit B through the vehicle central control, or may obtain the pressure value of the second oil circuit B through a pressure sensor, and the specific selection may be made according to actual conditions.

[0053] The working state of the clutch 22 is used to indicate that the friction plate of the clutch needs to be compressed, and the non-working state of the clutch 22 is used to indicate that the friction plate of the clutch needs to be loosened.

[0054] In the embodiment of the present application, both the first oil circuit A and the second oil circuit B are unidirectional oil circuits. After the electronic pump 11 establishes oil pressure, the controller 13 controls the gating state of the first regulating valve module 12 based on the pressure value of the second oil circuit B when the clutch 22 is in the operating state. When the clutch 22 needs to be tightened, the first regulating valve module 12 is controlled to be in the first gating state, and the electronic pump 11 draws hydraulic oil from the second oil circuit B to ensure that the clutch 22 can be tightened. At the same time, because the second oil circuit B is unidirectional, after the clutch 22 is tightened, the first regulating valve module 12 can be switched to the second gating state, and the electronic pump 11 draws hydraulic oil from the third oil circuit C to operate the cooling and lubricating oil injectors.

[0055] The present embodiment provides a hydraulic system for a DHT transmission, comprising a first oil circuit A, a second oil circuit B, a third oil circuit C, an electronic pump 11, a first regulating valve module 12, and a controller 13. The controller 13 controls the gating state of the first regulating valve module 12 to ensure that hydraulic oil is supplied to the second oil circuit B when the clutch 22 needs to be tightened. After the clutch 22's needs are met, the gating state is switched to supply hydraulic oil to the third oil circuit C, ensuring the proper functioning of the cooling and lubricating injectors 12. This system utilizes a single electronic pump to supply hydraulic oil to both oil circuits, eliminating the need for a dual-pump system. This ensures the proper functioning of the DHT transmission while reducing costs and providing high practicality.

[0056] In some embodiments of the present application, controlling the first regulating valve module 12 to be in the first gating state or the second gating state according to the pressure value of the second oil circuit includes:

[0057] When the pressure value does not reach the specified pressure value, controlling the first regulating valve module to be in the first gating state;

[0058] When the pressure value reaches the specified pressure value, the first regulating valve module is controlled to be in the second gating state.

[0059] Among them, the specified pressure value is the real-time pressure value that the clutch 22 needs to be pressed into place, which needs to be determined according to the degree of clutch pedaling. The specified pressure value can be transmitted to the controller 13 by the vehicle central control or the clutch pressure sensor, and can be selected according to actual conditions.

[0060] When the pressure value of the second oil circuit B does not reach the specified pressure value, it indicates that the current clutch 22 has not been tightened. It is necessary to control the first regulating valve module 12 to be in the first selection state to control the electronic pump 11 to transfer the hydraulic oil to the second oil circuit B to facilitate the tightening of the clutch 22.

[0061] When the pressure value of the second oil circuit B reaches the specified pressure value, it indicates that the current clutch 22 has been tightened. At this time, the first regulating valve module 12 is switched to the second selection state, and the electronic pump 11 can be controlled to transfer the hydraulic oil to the third oil circuit C to facilitate the operation of the cooling and lubricating nozzle 23.

[0062] The embodiment of the present application controls the selection state of the first regulating valve 12 by comparing the pressure value of the second oil circuit B with the specified pressure value. This can provide hydraulic oil to the cooling and lubricating oil nozzle while effectively ensuring that the clutch 22 is tightened, ensuring that both parties can work reliably and improving the stability of the vehicle.

[0063] Figure 2 This is a structural diagram of another DHT transmission hydraulic control system provided by an embodiment of the present application. Figure 2 In some embodiments of the present application, the first regulating valve module 12 includes a first one-way valve 121 and a reversing valve 122 ; the reversing valve 122 is controlled by the controller 13 ;

[0064] The first one-way valve 121 has an input end connected to the first end of the first regulating valve module 12 and an output end connected to the first end of the reversing valve 122 ; that is, the input end of the first one-way valve 121 is connected to the second end of the electronic pump 11 .

[0065] The second end of the reversing valve 122 is connected to the second end of the first regulating valve module 12, and the third end is connected to the third end of the first regulating valve module 12; that is, the second end of the reversing valve 122 is connected to the second oil circuit B, and the third end of the reversing valve 122 is connected to the third oil circuit C.

[0066] Among them, when the first regulating valve module 12 is in the first selection state, the first end of the reversing valve 122 and the second end of the reversing valve 122 are connected; when the first regulating valve module 12 is in the second selection state, the first end of the reversing valve 122 and the third end of the reversing valve 122 are connected.

[0067] The reversing valve 122 can be a reversing solenoid valve controlled by the controller 13 and capable of switching between open and closed states. The first one-way valve 121 ensures unidirectional flow in the first oil circuit A, ensuring that the hydraulic oil flows in one direction and prevents backflow under any circumstances. A reversing valve is a directional control valve with two or more flow patterns and two or more oil ports. It enables the flow of hydraulic oil to be communicated, cut off, and reversed, as well as pressure unloading and sequential control. A one-way valve, also known as a check valve or non-return valve, is used in hydraulic systems to prevent reverse flow of oil.

[0068] See also Figure 2 , in some embodiments of the present application, comprising: a second regulating valve module 14 , the second end of which is used to be connected to the clutch 22 , and the oil drain port of which is used to be connected to the fuel tank 21 of the vehicle;

[0069] When the second regulating valve module 14 is in a pressure relief state, the hydraulic oil in the second oil circuit B flows into the oil tank 21 through the oil drain port of the second regulating valve module 14 .

[0070] In the embodiment of the present application, the oil drain port is not directly physically connected to the oil tank. The oil tank is at the bottom of the transmission. When in a pressure relief state, the hydraulic oil in the oil drain port will flow into the oil tank along the object oil guide groove due to gravity.

[0071] In some embodiments of the present application, controlling the second regulating valve module 14 to be in a pressure maintaining state or a pressure releasing state according to whether the clutch 22 is in an operating state includes:

[0072] When the clutch 22 is in the working state, the second regulating valve module 14 is controlled to be in the pressure maintaining state;

[0073] When the clutch 22 is not in the working state, the second regulating valve module 14 is controlled to be in the pressure relief state.

[0074] The second regulating valve module 14 ensures unidirectional flow in the second oil circuit B. It also maintains pressure when the clutch 22 is engaged, preventing hydraulic oil leakage. When the clutch 22 is not in operation, hydraulic oil from the second oil circuit B is no longer needed. In this case, the second regulating valve module 14 is switched to a pressure relief state, releasing the hydraulic oil in the second oil circuit B into the fuel tank 21.

[0075] By adding the second regulating valve module 14, the embodiment of the present application can ensure the pressure of the second oil circuit B when the clutch 22 is in the working state, so that the clutch 22 can be reliably tightened, and when the clutch 22 is in the non-working state, the pressure of the second oil circuit B is relieved so that the clutch 22 can be reliably released, further improving the working reliability of the DHT transmission.

[0076] In some embodiments of the present application, the controller 13 is further configured to, after controlling the first regulating valve module 14 to be in the second gating state:

[0077] If the pressure holding time of the second oil circuit B reaches the preset time, the first regulating valve module 12 is controlled to switch to the first gating state to replenish oil to the second oil circuit B;

[0078] After the second oil circuit B is replenished with oil, if the pressure value of the second oil circuit B reaches the preset pressure value, the first regulating valve module 12 is controlled to switch back to the second gating state.

[0079] Generally speaking, after the second regulating valve module 14 is in the pressure-maintaining state, the hydraulic oil will leak to a certain extent over time, and the pressure value of the second oil circuit B will still decrease over time. Therefore, after the pressure-maintaining time of the second oil circuit B reaches the preset time, the first regulating valve module 12 will be controlled to switch to the first selection state to replenish oil and maintain pressure in the second oil circuit B. After replenishing oil and maintaining pressure in the second oil circuit B, if the pressure value of the second oil circuit B reaches the preset pressure value, the first regulating valve module 12 will be switched back to the second selection state to continue to supply hydraulic oil to the cooling and lubricating oil nozzle. Among them, the preset pressure value can be a specified pressure value or a real-time pressure value that satisfies the clutch 22 compression, and can be selected according to actual conditions.

[0080] When the clutch 22 is in operation, the controller 13 of the embodiment of the present application monitors the pressure holding time to facilitate timely and short-term oil replenishment and pressure maintenance in the second oil circuit B. After the oil replenishment and pressure maintenance are completed, the controller 13 continues to supply hydraulic oil to the third oil circuit C. The oil replenishment and pressure maintenance time is very short, typically tens or hundreds of milliseconds, and has little impact on the normal operation of the cooling and lubricating oil nozzles.

[0081] See also Figure 2 In some embodiments of the present application, the second regulating valve module 14 includes a second one-way valve 11 and a closing valve 142 ; the closing valve 142 is controlled by the controller 13 .

[0082] The second one-way valve 141 has an input end connected to the first end of the second regulating valve module 14 , and an output end connected to the second end of the second regulating valve module 14 and the first end of the closing valve 142 respectively; the second end of the closing valve 142 is connected to the third end of the second regulating valve module 14 .

[0083] Among them, when the first end of the closing valve 142 and the second end of the closing valve 142 are not connected, the second regulating valve module 14 is in a pressure maintaining state; when the first end of the closing valve 142 and the second end of the closing valve 142 are connected, the second regulating valve module 14 is in a pressure relief state.

[0084] Second one-way valve 141 ensures unidirectional flow of hydraulic oil in second oil circuit B. Closing valve 142 can be a solenoid valve. A normal solenoid valve has a leakage rate of 200 ml / min, while a closed solenoid valve has a leakage rate of less than 10 ml / min. Using closing valve 142 significantly improves the sealing performance of second oil circuit B when closed, keeping the pressure within clutch 22 essentially constant over time.

[0085] See also Figure 2 In some embodiments of the present application, the system 10 further includes an accumulator 15 and a pressure sensor 16; the accumulator 15 and the pressure sensor 16 are both provided on the second oil circuit B;

[0086] The accumulator 15 is used to stabilize the pressure of the hydraulic oil in the second oil circuit B within a preset range;

[0087] The pressure sensor 16 is connected to the accumulator 15 and is used to send the pressure value of the accumulator 15 to the controller 13 as the pressure value of the second oil circuit B.

[0088] An accumulator is an energy storage device in hydraulic and pneumatic systems. It converts system energy into compression energy or potential energy at the appropriate time and stores it. When needed, it converts the compression energy or potential energy into hydraulic or pneumatic pressure and releases it to replenish the system. When the system experiences a sudden increase in pressure, the accumulator absorbs this energy to maintain normal system pressure.

[0089] In an embodiment of the present application, the accumulator 15, the pressure sensor 16 and the closing valve 142 are in a parallel relationship, and all three are connected to the second oil circuit B. Among them, the hydraulic oil can be drained through the closing valve 142. The pressure sensor 16 is fixed to the oil wall of the second oil circuit B (on the housing) by threads. The pressure sensor can contact the hydraulic oil, sense the pressure, and then convert the pressure signal into an electrical signal, and transmit it to the controller 13 through a wiring harness. The accumulator 15 is also installed on the oil wall of the second oil circuit B and is connected to the hydraulic oil. The accumulator 16 is composed of a piston and a spring. The hydraulic oil pressure piston spring is compressed, and vice versa the spring returns.

[0090] See also Figure 2 In some embodiments of the present application, the system 10 further includes a filter press 17;

[0091] The filter press 17 is provided on the third oil circuit C, with a first end connected to the third end of the first regulating valve module 12 and a second end used to be connected to the cooling lubrication oil injection nozzle 23 of the vehicle.

[0092] For example, see Figure 3 , Figure 3 This is a structural diagram of another DHT transmission hydraulic control system provided by the embodiment of the present application. Figure 3 The solution of the embodiment of the present application is described.

[0093] like Figure 3 As shown, the electronic pump 11 is connected to the first one-way valve 121 and the reversing valve 122. The reversing valve 5 is connected to the second oil circuit B and the third oil circuit C respectively. The second oil circuit B is installed with a second one-way valve 141, a closing valve 142, an accumulator 16 and a pressure sensor 15. The third oil circuit C is connected to the pressure filter 17. A cooling and lubricating oil nozzle is provided at the end of the third oil circuit C.

[0094] The control process is as follows:

[0095] S101 , oil pressure is established by controlling the rotation of the electronic pump 11 , and the reversing valve 122 switches the hydraulic oil to the second oil circuit B.

[0096] S102: Hydraulic oil enters the clutch 22 through the second one-way valve 141, and the oil pressure compresses the friction plate of the clutch 22. The second one-way valve 141 ensures that the hydraulic oil flows in one direction and does not flow back under any circumstances.

[0097] S103 , the accumulator 16 performs pressure stabilization to avoid pressure fluctuations, while the pressure sensor 9 can measure specific pressure data for use by the controller 13 .

[0098] S104 , after the clutch 22 is pressed into place (ie, reaches a specified pressure value), the closing valve 142 is closed to form a closed system.

[0099] S105 , when the pressure in the clutch 22 reaches the specified pressure value and the closing valve 142 is closed, the reversing valve 122 switches the hydraulic oil to the third oil circuit C, and the hydraulic oil passes through the filter press 17 to lubricate and cool the automobile parts.

[0100] S106: When the pressure-maintaining time of the second oil circuit reaches a preset time, or the pressure value of the second oil circuit B falls below a specified pressure value, the reversing valve 122 switches the hydraulic oil to the second oil circuit B for a short period of time to replenish the oil and maintain the pressure. When the pressure value of the second oil circuit B reaches the specified pressure value again, the hydraulic oil is switched to the third oil circuit C.

[0101] S107, when the clutch 22 is to be opened (ie switched to a non-working state), the clutch 22 cavity no longer needs an oil circuit, and the closing valve 142 is opened to drain the oil.

[0102] An embodiment of the present application also provides a vehicle, including a DHT transmission hydraulic control system as in any of the above embodiments, the vehicle also including a cooling and lubricating oil spray nozzle, a suction filter and an oil tank; the cooling and lubricating oil spray nozzle is connected to the output end of the third oil circuit for cooling and lubricating the parts of the vehicle; the suction filter is connected between the oil tank and the electronic pump for filtering the hydraulic oil in the oil tank.

[0103] The embodiment of this application uses a closed valve, which is more cost-effective than a conventional proportional solenoid valve connected in series in the oil circuit. This embodiment of the application uses a reversing valve to switch the hydraulic oil, eliminating the combination of a pilot solenoid valve and a main pressure regulating mechanical valve, significantly reducing costs. This embodiment of the application uses only a single electronic pump, significantly reducing costs compared to a conventional dual-pump structure.

[0104] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A DHT transmission hydraulic control system, characterized in that: The system comprises a first oil circuit, a second oil circuit, a third oil circuit, an electronic pump, a first regulating valve module, a second regulating valve module and a controller; the first oil circuit is provided with an electronic pump, the second regulating valve module is connected to the second oil circuit, and the first regulating valve module and the second regulating valve module are both controlled by the controller; The first regulating valve module has a first end connected to the electronic pump, a second end connected to the second oil circuit and the first end of the second regulating valve module respectively, and a third end connected to the third oil circuit; the electronic pump is used to pump hydraulic oil from the vehicle's fuel tank to the first oil circuit, the second oil circuit is used to transmit hydraulic oil to the vehicle's clutch, and the third oil circuit is used to transmit hydraulic oil to the vehicle's cooling and lubricating oil injectors; The controller is configured to, when the clutch is in an operating state and the pressure value of the second oil circuit does not reach a specified pressure value, control the first regulating valve module to be in a first gating state; and when the pressure value of the second oil circuit reaches a specified pressure value, control the first regulating valve module to be in a second gating state; wherein the first gating state is used to instruct the electronic pump to transfer the hydraulic oil to the second oil circuit, and the second gating state is used to instruct the electronic pump to transfer the hydraulic oil to the third oil circuit; The controller is further configured to control the second regulating valve module to be in a pressure-maintaining state when the clutch is in an operating state; and to control the second regulating valve module to be in a pressure-releasing state when the clutch is not in an operating state; wherein the pressure-maintaining state is used to indicate that the second oil circuit maintains pressure, and the pressure-releasing state is used to indicate that the second oil circuit releases pressure; Wherein, the first regulating valve module includes a first one-way valve and a reversing valve; the reversing valve is controlled by the controller; The first one-way valve has an input end connected to the first end of the first regulating valve module and an output end connected to the first end of the reversing valve; The reversing valve has a second end connected to the second end of the first regulating valve module and a third end connected to the third end of the first regulating valve module; When the first regulating valve module is in the first selection state, the first end of the reversing valve and the second end of the reversing valve are connected; when the first regulating valve module is in the second selection state, the first end of the reversing valve and the third end of the reversing valve are connected.

2. The DHT transmission hydraulic control system according to claim 1, characterized in that: include: The second regulating valve module has a second end for connecting to the clutch, and an oil drain port for connecting to the fuel tank of the vehicle; When the second regulating valve module is in a pressure relief state, the hydraulic oil in the second oil circuit flows into the oil tank through the oil drain port of the second regulating valve module.

3. The DHT transmission hydraulic control system according to claim 2, characterized in that: The controller is further configured to, after controlling the first regulating valve module to be in the second gating state: If the pressure holding time of the second oil circuit reaches a preset time, controlling the first regulating valve module to switch to the first gating state to replenish oil to the second oil circuit; After the second oil circuit is replenished with oil, if the pressure value of the second oil circuit reaches a preset pressure value, the first regulating valve module is controlled to switch back to the second gating state.

4. The DHT transmission hydraulic control system according to claim 2, characterized in that: The second regulating valve module includes a second one-way valve and a closing valve; The second one-way valve has an input end connected to the first end of the second regulating valve module, and an output end connected to the second end of the second regulating valve module and the first end of the closing valve respectively; the second end of the closing valve is connected to the third end of the second regulating valve module; When the first end of the closing valve and the second end of the closing valve are not connected, the second regulating valve module is in a pressure maintaining state; when the first end of the closing valve and the second end of the closing valve are connected, the second regulating valve module is in a pressure relief state.

5. The DHT transmission hydraulic control system according to claim 1, characterized in that: The system further includes an accumulator and a pressure sensor; the accumulator and the pressure sensor are both arranged on the second oil circuit; The accumulator is used to stabilize the pressure value of the hydraulic oil in the second oil circuit within a preset range; The pressure sensor is connected to the accumulator and is used to send the pressure value of the accumulator to the controller as the pressure value of the second oil circuit.

6. The DHT transmission hydraulic control system according to claim 1, characterized in that: The system also includes a filter press; The filter press is arranged in the third oil circuit, with a first end connected to the third end of the first regulating valve module and a second end used to be connected to the cooling and lubricating oil injection nozzle of the automobile.

7. A vehicle comprising a DHT transmission hydraulic control system according to any one of claims 1 to 6, characterized in that: The vehicle also includes a cooling and lubricating oil spray nozzle, a suction filter and a fuel tank; The cooling and lubricating oil nozzle is connected to the output end of the third oil circuit and is used for cooling and lubricating the parts of the vehicle; The suction filter is connected between the oil tank and the electronic pump and is used for filtering the hydraulic oil in the oil tank.

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