Hydraulic control system and method for hybrid power transmission

Abstract

The embodiment of the invention provides a hybrid power transmission hydraulic control system and method, and relates to the technical field of transmission hydraulic control. The system comprises a hydraulic oil tank, a mechanical oil pump, an electric oil pump, a first slide valve, a second slide valve, a pressure control assembly, a driving motor cooling and lubricating system, a generator cooling and lubricating system and an engine cooling and lubricating system. A mechanical oil pump and an electric oil pump are arranged to supply hydraulic oil to the driving motor cooling and lubricating system, the generator cooling and lubricating system and the engine cooling and lubricating system; different cooling flow distribution proportions under three modes of a driving motor cooling and lubricating system, a generator cooling and lubricating system and an engine cooling and lubricating system are realized, and the cooling flow distribution proportions are automatically switched according to the working mode of the hybrid transmission without active adjustment. The system cost and the complexity of control software can be remarkably reduced, and the efficiency of a hydraulic system is improved.

Description

Technical Field

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

[0002] The cooling and lubrication module of the hydraulic system of the traditional dual-motor hybrid transmission usually uses a fixed throttle hole to distribute the cooling flow of each component of the drive motor route, the generator route, and the engine route. The distribution ratio between each route is fixed and unchanged, and the cooling flow requirements of each component under different working conditions can only be met by changing the size of the total cooling flow. When the hybrid transmission is running in different working modes, the cooling flow requirements of each component of the drive motor route, the generator route, and the engine route will vary greatly. The technical solution of only using a fixed throttle hole for cooling flow distribution needs to meet the maximum cooling flow requirements of each component by increasing the total cooling flow. This obviously requires increasing the power of the hydraulic oil source and selecting a larger displacement oil pump, resulting in an increase in cost and an increase in structural size. It is understandable that the technical solution of only using a fixed throttle hole for cooling flow distribution will inevitably lead to a synchronous increase in the cooling flow allocated to other routes while meeting the maximum cooling flow requirements of a certain route. On the one hand, this will cause a waste of flow and reduce the efficiency of the hydraulic system. On the other hand, excessive cooling flow in other routes may cause greater oil stirring losses, further reducing system efficiency.

[0003] In order to solve the above problems, a common solution is to set a flow distribution solenoid valve in the cooling and lubrication module. Theoretically, 2 to 3 flow distribution ratios can be achieved. However, in practice, it is difficult to achieve this because the actual flow in the transmission is not easy to measure, the pressure drop increases due to the solenoid valve spool stroke limitation, and the consistency of the solenoid valve is difficult to ensure. In addition, setting a flow distribution solenoid valve will significantly increase the cost, occupy additional control system ports of the electronic control system, and increase the complexity of the control software. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a hybrid transmission hydraulic control system and method, which is used to automatically switch the cooling flow distribution ratio according to the hybrid transmission working mode without the need for active adjustment, thereby improving the efficiency of the hydraulic system.

[0005] In a first aspect, an embodiment of the present application provides a hybrid transmission hydraulic control system, comprising: a hydraulic oil tank, a mechanical oil pump, an electric oil pump, a first slide valve, a second slide valve, a pressure control component, a drive motor cooling and lubrication system, a generator cooling and lubrication system, and an engine cooling and lubrication system, wherein the mechanical oil pump and the electric oil pump are respectively connected to the hydraulic oil tank, the electric oil pump is connected to the drive motor cooling and lubrication system, the generator cooling and lubrication system, and the engine cooling and lubrication system, the mechanical oil pump is connected to the pressure control component, the pressure control component is respectively connected to the first slide valve and the second slide valve, the first slide valve is connected to the second slide valve, and the second slide valve is respectively connected to the generator cooling and lubrication system and the engine cooling and lubrication system;

[0006] When the mechanical oil pump and / or the electric oil pump is working, the hydraulic oil is delivered to the drive motor cooling and lubrication system, the generator cooling and lubrication system and the engine cooling and lubrication system;

[0007] When the mechanical oil pump is working, the pressure control component applies a first pressure to the first slide valve to control the first slide valve and the second slide valve to turn on a first switch, thereby delivering a set amount of hydraulic oil to the generator cooling and lubrication system;

[0008] When the mechanical oil pump is working, the pressure control component applies a first pressure to the first slide valve and a second pressure to the second slide valve to control the first slide valve and the second slide valve to turn on the second switch to deliver a set amount of hydraulic oil to the engine cooling and lubrication system.

[0009] In the above implementation process, a mechanical oil pump and an electric oil pump are set to supply hydraulic oil to the drive motor cooling lubrication system, the generator cooling lubrication system and the engine cooling lubrication system, and a pressure control component, a first slide valve and a second slide valve are set to realize different cooling flow distribution ratios in the three modes of the drive motor cooling lubrication system, the generator cooling lubrication system and the engine cooling lubrication system, and the cooling flow distribution ratio is automatically switched according to the hybrid transmission working mode, without the need for active adjustment, which can significantly reduce the system cost and the complexity of the control software and improve the efficiency of the hydraulic system.

[0010] Furthermore, it also includes a first mechanical slide valve, a clutch control module and a gear selection and shift control module, and the mechanical oil pump is respectively connected to the first slide valve, the pressure control component, the first mechanical slide valve, the clutch control module and the gear selection and shift control module through a first oil circuit;

[0011] The clutch control module is connected to the clutch control system via a fourth oil circuit, and the gear selection and shift control module is connected to the gear selection and shift control system via a fifth oil circuit.

[0012] In the above implementation process, when the oil flow in the first oil circuit can meet the requirements of the clutch control module and the gear selection control module, the excess flow in the first oil circuit can be transported to the third oil circuit through the first mechanical slide valve for use by the cooling and lubrication system, thereby improving oil utilization and thus improving system efficiency.

[0013] Furthermore, the pressure control component includes a first solenoid valve, the first solenoid valve is respectively connected to the second slide valve and the first mechanical slide valve through a second oil circuit, and a damping accumulator is provided on the second oil circuit.

[0014] In the above implementation process, with the cooperation of the first solenoid valve and the first mechanical slide valve, the pressure of the first oil circuit can be changed by changing the command current of the first solenoid valve, thereby achieving pressure regulation of the first oil circuit.

[0015] Furthermore, the sixth oil circuit of the electric oil pump merges with the third oil circuit output by the first mechanical slide valve to form a seventh oil circuit, and the seventh oil circuit outputs an eighth oil circuit after passing through a cooler and a low-pressure filter. The eighth oil circuit is connected to the first slide valve through a tenth oil circuit, and the eighth oil circuit is respectively connected to the drive motor cooling and lubrication system, the generator cooling and lubrication system and the engine cooling and lubrication system through a ninth oil circuit; the first slide valve is connected to the second slide valve through an eleventh oil circuit.

[0016] In the above implementation process, the oil circuits for the hydraulic oil to flow formed between the various components realize the supply demand of the hydraulic oil.

[0017] Furthermore, a first fixed throttle hole is provided on the oil circuit connecting the ninth oil circuit and the drive motor cooling lubrication system, a second fixed throttle hole is provided on the oil circuit connecting the ninth oil circuit and the generator cooling lubrication system, and a third fixed throttle hole is provided on the oil circuit connecting the ninth oil circuit and the engine cooling lubrication system;

[0018] A fourth fixed throttle hole is provided on the oil passage connecting the second slide valve and the engine cooling lubrication system, and a fifth fixed throttle hole is provided on the oil passage connecting the second slide valve and the generator cooling lubrication system.

[0019] In the above implementation process, a plurality of fixed throttle holes are provided to control the hydraulic oil flow of the corresponding oil circuit, thereby avoiding inconvenience caused by excessive hydraulic oil flow.

[0020] Furthermore, the hydraulic oil tank is provided with an oil suction filter, and the first oil circuit is provided with a pressure-limiting safety valve.

[0021] In the above implementation process, an oil suction filter is set to filter out impurities and particles in the oil to prevent these impurities from entering the hydraulic system, thereby protecting the pump, valves and other precision components; a pressure-limiting safety valve is set to limit the maximum pressure of the first oil circuit to ensure system safety.

[0022] In a second aspect, an embodiment of the present application provides a hybrid transmission hydraulic control method, which is applied to the hybrid transmission hydraulic control system as described above, comprising:

[0023] When the mechanical oil pump and / or the electric oil pump is working, the hydraulic oil is delivered to the drive motor cooling and lubrication system, the generator cooling and lubrication system and the engine cooling and lubrication system;

[0024] When the mechanical oil pump is working, the pressure control component applies a first pressure to the first slide valve to control the first slide valve and the second slide valve to turn on a first switch, thereby delivering a set amount of hydraulic oil to the generator cooling and lubrication system;

[0025] When the mechanical oil pump is working, the pressure control component applies a first pressure to the first slide valve and a second pressure to the second slide valve to control the first slide valve and the second slide valve to turn on the second switch to deliver a set amount of hydraulic oil to the engine cooling and lubrication system.

[0026] Further, the pressure control component controls the first slide valve and the second slide valve to conduct the first switch by applying the first pressure to the first slide valve, comprising:

[0027] Control the current of the first solenoid valve to be 0, the pressure of the second oil circuit to be 0, and the first oil circuit to establish pressure and maintain a preset pressure value;

[0028] The right control port of the first slide valve is in communication with the first oil circuit, the right control port of the second slide valve is in communication with the second oil circuit, there is pressure in the right control port of the first slide valve, the pressure in the right control port of the second slide valve is 0, and the second slide valve works in the first switch position under the action of the left compression spring;

[0029] The first oil circuit applies pressure to the first slide valve, so that the first slide valve is turned on, the tenth oil circuit is connected to the eleventh oil circuit, and the eighth oil circuit transmits the first part of the hydraulic oil to the ninth oil circuit;

[0030] The eighth oil circuit conveys the second part of the hydraulic oil to the eleventh oil circuit via the tenth oil circuit, and conveys the second part of the hydraulic oil to the generator cooling lubrication system via the second slide valve and the fifth fixed throttle hole.

[0031] Further, the pressure control component applies a first pressure to the first slide valve and a second pressure to the second slide valve to control the first slide valve and the second slide valve to conduct the second switch, including:

[0032] The current of the first solenoid valve is controlled to be non-zero, the pressure of the second oil circuit is controlled to be non-zero, and the first oil circuit builds up pressure and maintains a preset pressure value;

[0033] The right control port of the first slide valve is in communication with the first oil circuit, the right control port of the second slide valve is in communication with the second oil circuit, pressure exists in the right control port of the first slide valve, and pressure exists in the right control port of the second slide valve;

[0034] The first oil circuit applies pressure to the first slide valve, so that the first slide valve is turned on; the second oil circuit applies pressure to the second slide valve, and the second slide valve works in the second switch position under the action of pressure; the tenth oil circuit is connected to the eleventh oil circuit; and the eighth oil circuit transmits the first part of the hydraulic oil to the ninth oil circuit;

[0035] The eighth oil circuit delivers the second part of the hydraulic oil to the eleventh oil circuit via the tenth oil circuit, and delivers the hydraulic oil to the engine cooling lubrication system via the second slide valve and the fourth fixed throttle hole.

[0036] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0037] A processor, a memory and a bus, wherein the processor is connected to the memory via the bus, and the memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, they are used to implement the hybrid transmission hydraulic control method as described above.

[0038] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a server, the hybrid transmission hydraulic control method as described above is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 It is a schematic diagram of the oil tank structure of a hybrid transmission hydraulic control system provided in an embodiment of the present application;

[0041] Figure 2 A schematic flow chart of a hybrid transmission hydraulic control method provided in an embodiment of the present application;

[0042] Figure 3 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application;

[0043] Among them, 1. the first oil circuit; 2. the second oil circuit; 3. the third oil circuit; 4. the fourth oil circuit; 5. the fifth oil circuit; 6. the sixth oil circuit; 7. the seventh oil circuit; 8. the eighth oil circuit; 9. the ninth oil circuit; 10. the tenth oil circuit; 11. the eleventh oil circuit; 101. the hydraulic oil tank; 102. the oil suction filter; 103. the mechanical oil pump; 104. the electric oil pump; 105. the first solenoid valve; 106. the first mechanical slide valve; 107. the damping accumulator; 108. the pressure limiting safety valve; 109. the clutch control module; 110. the gear selection and shifting control module; 111. the cooler; 112. the low-pressure filter; 113. the first slide valve; 114. the second slide valve; 115. the first fixed throttle hole; 116. the second fixed throttle hole; 117. the third fixed throttle hole; 118. the fourth fixed throttle hole; 119. the fifth fixed throttle hole. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0045] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0046] Please see Figure 1 , Figure 1A structural schematic diagram of a hybrid transmission hydraulic control system provided in an embodiment of the present application. The hybrid transmission hydraulic control system includes: a hydraulic oil tank 101, a mechanical oil pump 103, an electric oil pump 104, a first slide valve 113, a second slide valve 114, a pressure control component, a drive motor cooling and lubrication system, a generator cooling and lubrication system, and an engine cooling and lubrication system, wherein the mechanical oil pump 103 and the electric oil pump 104 are respectively connected to the hydraulic oil tank 101, the electric oil pump 104 is connected to the drive motor cooling and lubrication system, the generator cooling and lubrication system, and the engine cooling and lubrication system, the mechanical oil pump 103 is connected to the pressure control component, the pressure control component is respectively connected to the first slide valve 113 and the second slide valve 114, the first slide valve 113 is connected to the second slide valve 114, and the second slide valve 114 is respectively connected to the generator cooling and lubrication system and the engine cooling and lubrication system.

[0047] Wherein, when the mechanical oil pump 103 and / or the electric oil pump 104 are working, hydraulic oil is delivered to the drive motor cooling and lubrication system, the generator cooling and lubrication system and the engine cooling and lubrication system; when the mechanical oil pump 103 is working, the pressure control component applies a first pressure to the first slide valve 113 to control the first slide valve 113 and the second slide valve 114 to turn on the first switch, thereby delivering a set amount of hydraulic oil to the generator cooling and lubrication system; when the mechanical oil pump 103 is working, the pressure control component applies a first pressure to the first slide valve 113 and a second pressure to the second slide valve 114 to control the first slide valve 113 and the second slide valve 114 to turn on the second switch, thereby delivering a set amount of hydraulic oil to the engine cooling and lubrication system.

[0048] Optionally, the power source of the mechanical oil pump 103 is the engine, and its speed is positively correlated with the engine speed. Compared with the electric oil pump 104, the mechanical oil pump 103 can significantly reduce the system cost; the speed and output flow of the electric oil pump 104 can be adjusted according to the control requirements.

[0049] Optionally, the first slide valve 113 is a two-position two-way switch valve, whose control port is connected to the first oil circuit 1 ; the second slide valve 114 is a three-position three-way flow valve, whose control port is connected to the second oil circuit 2 .

[0050] As described above, the embodiment of the present application arranges a mechanical oil pump 103 and an electric oil pump 104 to supply hydraulic oil to the drive motor cooling lubrication system, the generator cooling lubrication system and the engine cooling lubrication system, and arranges a pressure control component, a first slide valve 113 and a second slide valve 114 to realize different cooling flow distribution ratios in the three modes of the drive motor cooling lubrication system, the generator cooling lubrication system and the engine cooling lubrication system, and the cooling flow distribution ratio is automatically switched according to the hybrid transmission working mode, without the need for active adjustment, which can significantly reduce the system cost and the complexity of the control software, and improve the efficiency of the hydraulic system.

[0051] In some embodiments, it also includes a first mechanical slide valve 106, a clutch control module 109 and a gear selection and shift control module 110. The mechanical oil pump 103 is respectively connected to the first slide valve 113, the pressure control component, the first mechanical slide valve 106, the clutch control module 109 and the gear selection and shift control module 110 through the first oil circuit 1; the clutch control module 109 is connected to the clutch control system through the fourth oil circuit 4, and the gear selection and shift control module 110 is connected to the gear selection and shift control system through the fifth oil circuit 5; wherein, when the oil flow of the first oil circuit 1 can meet the requirements of the clutch control module 109 and the gear selection and shift control module 110, the excess flow in the first oil circuit 1 can be transported to the third oil circuit 3 through the first mechanical slide valve 106 for use by the cooling and lubrication system, thereby improving the oil utilization rate and thus improving the system efficiency.

[0052] In some embodiments, the pressure control component includes a first solenoid valve 105, which is respectively connected to the second slide valve 114 and the first mechanical slide valve 106 through a second oil circuit 2, and a damping accumulator 107 is provided on the second oil circuit 2; wherein, with the cooperation of the first solenoid valve 105 and the first mechanical slide valve 106, the pressure of the first oil circuit 1 can be changed by changing the command current of the first solenoid valve 105, thereby realizing pressure regulation of the first oil circuit 1.

[0053] Optionally, a damping accumulator 107 is connected in parallel to the second oil circuit 2 to improve pressure fluctuations caused by pressure regulation and to enhance the stability of the pressure in the second oil circuit 2 .

[0054] Optionally, the first solenoid valve 105 is in a normally low-pressure form, that is, when the current is 0, its output pressure is 0, and when the current increases, its output pressure increases.

[0055] In some embodiments, the sixth oil circuit 6 of the electric oil pump 104 merges with the third oil circuit 3 output by the first mechanical slide valve 106 to form a seventh oil circuit 7. The seventh oil circuit 7 outputs an eighth oil circuit 8 after passing through a cooler 111 and a low-pressure filter 112. The eighth oil circuit 8 is connected to the first slide valve 113 through a tenth oil circuit 10, and the eighth oil circuit 8 is respectively connected to the drive motor cooling and lubrication system, the generator cooling and lubrication system and the engine cooling and lubrication system through a ninth oil circuit 9; the first slide valve 113 is connected to the second slide valve 114 through an eleventh oil circuit 11; wherein, the oil circuits for the circulation of hydraulic oil formed between the various components realize the supply demand of hydraulic oil.

[0056] The cooler 111 is used to cool the hydraulic oil, and the low-pressure filter 112 is used to filter out solid particles and colloidal substances in the hydraulic oil in the seventh pipeline, so as to effectively control the contamination degree of the hydraulic pressure.

[0057] It is understandable that hybrid vehicles usually have multiple driving modes, and the clutch control module 109 and the shift selection module need to be controlled only in the mode where the engine participates in the driving. Under the series working condition where the engine is running but not participating in the driving, the solenoid valve in the normal low-pressure form cooperates with the first slide valve 113 to achieve that the load pressure of the mechanical oil pump 103 is kept at a low preset value (for example, 3 bar), that is, the load pressure of the mechanical oil pump 103 is small, the energy consumption is reduced, and the system efficiency is improved. At the same time, the flow in the first oil circuit 1 can be transported to the third oil circuit 3 through the first mechanical slide valve 106 for cooling and lubrication, thereby improving the utilization rate of the oil and thus improving the system efficiency.

[0058] In some embodiments, a first fixed throttle hole 115 is provided on the oil circuit connecting the ninth oil circuit 9 and the drive motor cooling lubrication system, a second fixed throttle hole 116 is provided on the oil circuit connecting the ninth oil circuit 9 and the generator cooling lubrication system, and a third fixed throttle hole 117 is provided on the oil circuit connecting the ninth oil circuit 9 and the engine cooling lubrication system; a fourth fixed throttle hole 118 is provided on the oil circuit connecting the second slide valve 114 and the engine cooling lubrication system, and a fifth fixed throttle hole 119 is provided on the oil circuit connecting the second slide valve 114 and the generator cooling lubrication system; wherein, by setting the first fixed throttle hole 115, the second fixed throttle hole 116, the third fixed throttle hole 117, the fourth fixed throttle hole 118, and the fifth fixed throttle hole 119, the hydraulic oil flow of the corresponding oil circuits is respectively controlled to avoid inconvenience caused by excessive hydraulic oil flow.

[0059] In some embodiments, an oil suction filter 102 is provided on the hydraulic oil tank 101, and a pressure limiting safety valve 108 is provided on the first oil circuit 1; wherein, the oil suction filter 102 is provided to filter out impurities and particles in the oil to prevent these impurities from entering the hydraulic system, thereby protecting the pump, valves and other precision components; a pressure limiting safety valve 108 is provided in parallel with the first oil circuit 1, and when the pressure of the first oil circuit 1 exceeds the set pressure of the pressure limiting safety valve 108, the pressure limiting safety valve 108 opens to limit the maximum pressure of the first oil circuit 1, thereby ensuring the safety of the system and dealing with the problem of excessive increase in oil pressure in the first oil circuit 1 caused by the sticking of the first mechanical slide valve 106 or other abnormal conditions.

[0060] Specifically, the hybrid transmission hydraulic control system is composed of a hydraulic oil tank 101, an oil suction filter 102, a mechanical oil pump 103, an electric oil pump 104, a first solenoid valve 105, a first mechanical slide valve 106, a damping accumulator 107, a pressure limiting safety valve 108, a clutch control module 109, a shift control module 110, a cooler 111, a low-pressure filter 112, a first slide valve 113, a second slide valve 114, a first fixed throttle hole 115, a second fixed throttle hole 116, a third fixed throttle hole 117, a fourth fixed throttle hole 118, a fifth fixed throttle hole 119, a first oil circuit 1, a second oil circuit 2, a third oil circuit 3, a fourth oil circuit 4, a fifth oil circuit 5, a sixth oil circuit 6, a seventh oil circuit 7, an eighth oil circuit 8, a ninth oil circuit 9, a tenth oil circuit 10, and an eleventh oil circuit 11.

[0061] Main oil circuit pressure adjustment process: The pressure of the first oil circuit 1 is usually called the main oil circuit pressure. In the initial state, the pressure of the main oil circuit is 0, the current of the first solenoid valve 105 is 0, and the first mechanical slide valve 106 is in the state under the action of its left spring force. Figure 1 In the left working position shown, the first oil circuit 1 is not connected to the third oil circuit 3. When the mechanical oil pump 103 is running, the oil in the hydraulic oil tank 101 first flows through the oil suction filter 102, and then through the mechanical oil pump 103, it is delivered to the first oil circuit 1. Since the first oil circuit 1 is not connected to the third oil circuit 3, the first oil circuit 1 begins to build up pressure. For the first mechanical slide valve 106, the compression spring on its left side will generate a rightward force on the valve core, and the pressure of the second oil circuit 2 on its left side will generate a rightward force on the valve core. The combined force of these two forces and the first mechanical slide valve 106 Figure 1 The force on the right side of the first mechanical slide valve 106 is positively correlated with the pressure of the first oil circuit 1. The first solenoid valve 105 is a proportional pressure solenoid valve. By changing the command current of the first solenoid valve 105, the pressure of the second oil circuit 2 can be changed as needed. It can be understood that with the cooperation of the first solenoid valve 105 and the first mechanical slide valve 106, the pressure of the first oil circuit 1 can be changed by changing the command current of the first solenoid valve 105.

[0062] Cooling and lubrication flow replenishment process: As the pressure of the first oil circuit 1 gradually increases and reaches the left side force of the first mechanical slide valve 106, the valve core of the first mechanical slide valve 106 gradually moves, and its left spring is further compressed, and the valve core gradually moves to Figure 1 The first oil circuit 1 is in the right position shown in the figure, and the first oil circuit 1 is connected with the third oil circuit 3. When the oil flow of the first oil circuit 1 can meet the requirements of the clutch control module 109 and the gear selection and shifting control module 110, the excess flow in the first oil circuit 1 is delivered to the third oil circuit 3 through the first mechanical slide valve 106 for use by the cooling and lubrication system, thereby improving the oil utilization rate and thus improving the system efficiency.

[0063] Cooling and lubrication flow distribution process: When the electric oil pump 104 is running, the oil in the hydraulic oil tank 101 first flows through the oil suction filter 102, and is transported to the sixth oil circuit 6 through the electric oil pump 104, and then merges with the oil in the third oil circuit 3 and is transported to the seventh oil circuit 7. It is cooled and further filtered by the cooler 111 and the low-pressure filter 112 and then transported to the eighth oil circuit 8.

[0064] For example, please refer to Figure 1 When the hybrid transmission works in pure electric mode, the engine does not run, the mechanical oil pump 103 does not work, the pressure of the first oil circuit 1 is 0, the current of the first solenoid valve 105 is 0, and the pressure of the second oil circuit 2 is 0. Because the right control port of the first slide valve 113 is connected to the first oil circuit 1, and the right control port of the second slide valve 114 is connected to the second oil circuit 2, the pressure of the right control port of the first slide valve 113 is 0, and the pressure of the right control port of the second slide valve 114 is 0. The first slide valve 113 works under the action of the left compression spring. Figure 1 The left position shown in FIG. 1 (i.e., the first slide valve 113 is not conducting), and the second slide valve 114 works under the action of the left compression spring. Figure 1 The left position shown in the figure (i.e. the second slide valve 114 is not conducting), no hydraulic oil passes through the tenth oil circuit 10 and the eleventh oil circuit 11. At this time, all the hydraulic oil in the eighth oil circuit 8 is delivered to the ninth oil circuit 9, and is delivered to the drive motor route (i.e. the drive motor cooling and lubrication system), the generator route (i.e. the generator cooling and lubrication system), and the engine route (i.e. the engine cooling and lubrication system) through the first fixed throttle hole 115, the second fixed throttle hole 116, and the third fixed throttle hole 117, respectively, for cooling and lubricating each component under each route. By reasonably setting the parameters of the first fixed throttle hole 115, the second fixed throttle hole 116, and the third fixed throttle hole 117, the maximum cooling flow requirement of the drive motor route in the pure electric mode can be achieved, the cooling and lubrication flow can be effectively distributed, the cooling flow waste can be reduced, and the system efficiency can be improved.

[0065] When the hybrid transmission works in series mode, the engine is running, the mechanical oil pump 103 is working, the current of the first solenoid valve 105 is 0, the pressure of the second oil circuit 2 is 0, and the first oil circuit 1 builds up pressure and maintains a low preset value (set pressure value). Because the right control port of the first slide valve 113 is connected to the first oil circuit 1, and the right control port of the second slide valve 114 is connected to the second oil circuit 2, there is pressure in the right control port of the first slide valve 113, and the pressure of the right control port of the second slide valve 114 is 0. The second slide valve 114 works under the action of the left compression spring, and the first switch of the second slide valve 114 is turned on (that is, the second slide valve 114 is connected to the fifth fixed throttle hole 119). By designing the opening pressure of the first slide valve 113, the first slide valve 113 works in this mode. Figure 1 The right position shown in FIG. 1 (i.e., the first slide valve 113 is turned on), and the tenth oil circuit 10 is connected to the eleventh oil circuit 11. At this time, a part of the hydraulic oil in the eighth oil circuit 8 is delivered to the ninth oil circuit 9, and is delivered to the drive motor route, the generator route, and the engine route through the first fixed throttle hole 115, the second fixed throttle hole 116, and the third fixed throttle hole 117, respectively, for cooling and lubricating various components in each route; another part of the hydraulic oil in the eighth oil circuit 8 is delivered to the eleventh oil circuit 11 through the tenth oil circuit 10, and is delivered to the generator route through the fifth fixed throttle hole 119, for cooling and lubricating various components in the generator route. Obviously, in this mode, each component in the generator route can be allocated more cooling and lubricating flow, and the maximum cooling flow demand of the generator route in the series mode can be achieved by setting the parameters of the fifth fixed throttle hole 119, so as to achieve effective distribution of cooling and lubricating flow, reduce cooling flow waste, and improve system efficiency.

[0066] When the hybrid transmission is operating in parallel mode or engine direct drive mode, the engine is running, the mechanical oil pump 103 is working, the current of the first solenoid valve 105 is not 0, the pressure of the second oil circuit 2 is not 0, the first oil circuit 1 builds up pressure and maintains the required value (set pressure value) as needed. Because the right control port of the first slide valve 113 is connected to the first oil circuit 1, and the right control port of the second slide valve 114 is connected to the second oil circuit 2, there is pressure at the right control port of the first slide valve 113, and there is pressure at the right control port of the second slide valve 114. By designing the opening pressure of the first slide valve 113, the first slide valve 113 works in this mode. Figure 1The hydraulic oil in the eighth oil circuit 8 is transported to the ninth oil circuit 9, and is transported to the driving motor route, the generator route, and the engine route through the first fixed throttle hole 115, the second fixed throttle hole 116, and the third fixed throttle hole 117, respectively, for cooling and lubricating various components in each route; another part of the hydraulic oil in the eighth oil circuit 8 is transported to the eleventh oil circuit 11 through the tenth oil circuit 10, and is transported to the engine route through the fourth fixed throttle hole 118, and is used for cooling and lubricating various components in the engine route. It can be understood that in this mode, each component in the engine route can be allocated more cooling and lubrication flow. By reasonably setting the parameters of the fourth fixed throttle hole 118, the maximum cooling flow requirement of the engine route in parallel mode or engine direct drive mode can be achieved, thereby achieving effective distribution of cooling and lubrication flow, reducing cooling flow waste, and improving system efficiency.

[0067] As mentioned above, the hydraulic system solution provided in the embodiment of the present application can achieve different cooling flow distribution ratios in the three modes corresponding to the drive motor route, the generator route, and the engine route, and the cooling flow distribution ratio is automatically switched according to the hybrid transmission working mode, without the need for active adjustment, which can significantly reduce the system cost and control software complexity, and improve the efficiency of the hydraulic system, effectively solving existing problems.

[0068] In the second aspect, based on the above embodiments, Figure 2 A flow chart of a hybrid transmission hydraulic control method provided in an embodiment of the present application. Figure 2 The hybrid transmission hydraulic control method provided in this embodiment specifically includes:

[0069] 100. When the mechanical oil pump and / or the electric oil pump is working, the hydraulic oil is delivered to the drive motor cooling lubrication system, the generator cooling lubrication system and the engine cooling lubrication system.

[0070] 200. When the mechanical oil pump is working, the pressure control component applies a first pressure to the first slide valve to control the first slide valve and the second slide valve to turn on the first switch, thereby delivering a set amount of hydraulic oil to the generator cooling and lubrication system.

[0071] 210. Control the current of the first solenoid valve to be 0, the pressure of the second oil circuit to be 0, and the first oil circuit to establish pressure and maintain a preset pressure value.

[0072] 220. The right control port of the first slide valve is connected to the first oil circuit, the right control port of the second slide valve is connected to the second oil circuit, there is pressure at the right control port of the first slide valve, the pressure at the right control port of the second slide valve is 0, and the second slide valve works in the first switch position under the action of the left compression spring.

[0073] 230. The first oil circuit applies pressure to the first slide valve, so that the first slide valve is turned on, the tenth oil circuit is connected to the eleventh oil circuit, and the eighth oil circuit transmits the first part of the hydraulic oil to the ninth oil circuit.

[0074] 240. The eighth oil circuit transports the second part of the hydraulic oil to the eleventh oil circuit via the tenth oil circuit, and transports the second part of the hydraulic oil to the generator cooling lubrication system via the second slide valve and the fifth fixed throttle hole.

[0075] 300. When the mechanical oil pump is working, the pressure control component applies a first pressure to the first slide valve and a second pressure to the second slide valve to control the first slide valve and the second slide valve to turn on the second switch, thereby delivering a set amount of hydraulic oil to the engine cooling and lubrication system.

[0076] 310. Control the current of the first solenoid valve to be non-0, the pressure of the second oil circuit to be non-0, and the first oil circuit to establish pressure and maintain a preset pressure value.

[0077] 320. The right control port of the first sliding valve is connected to the first oil circuit, the right control port of the second sliding valve is connected to the second oil circuit, there is pressure in the right control port of the first sliding valve, and there is pressure in the right control port of the second sliding valve.

[0078] 330. The first oil circuit applies pressure to the first slide valve, making the first slide valve conductive. The second oil circuit applies pressure to the second slide valve, and the second slide valve operates in the second switch position under the action of pressure. The tenth oil circuit is connected to the eleventh oil circuit, and the eighth oil circuit delivers the first part of the hydraulic oil to the ninth oil circuit.

[0079] 340. The eighth oil circuit transports the second part of the hydraulic oil to the eleventh oil circuit via the tenth oil circuit, and transports the second part of the hydraulic oil to the engine cooling and lubrication system via the second sliding valve and the fourth fixed throttle hole.

[0080] As described above, in the embodiment of the present application, a mechanical oil pump and an electric oil pump are arranged to supply hydraulic oil to the drive motor cooling and lubrication system, the generator cooling and lubrication system and the engine cooling and lubrication system, and a pressure control component, a first slide valve and a second slide valve are arranged to realize different cooling flow distribution ratios in the three modes of the drive motor cooling and lubrication system, the generator cooling and lubrication system and the engine cooling and lubrication system, and the cooling flow distribution ratio is automatically switched according to the hybrid transmission working mode, without the need for active adjustment, which can significantly reduce the system cost and the complexity of the control software, and improve the efficiency of the hydraulic system.

[0081] The above steps are not to be performed in a strict order as described in the numbers, but should be understood as an overall solution.

[0082] The hybrid transmission hydraulic control system provided in the embodiment of the present application can be used to execute the hybrid transmission hydraulic control method provided in the above embodiment, and has corresponding functions and beneficial effects.

[0083] In a third aspect, an embodiment of the present application further provides an electronic device that can integrate the hybrid transmission hydraulic control system provided in an embodiment of the present application. Figure 3 Schematic diagram of the structure of an electronic device provided by an embodiment of the present application. Figure 3 The electronic device includes: an input device 73, an output device 74, a memory 72 and one or more processors 71; the memory 72 is used to store one or more programs; when the one or more programs are executed by the one or more processors 41, the one or more processors 71 implement the hybrid transmission hydraulic control method provided in the above embodiment. The input device 73, the output device 74, the memory 72 and the processor 71 can be connected by a bus or other means. Figure 3 The example of connecting through bus is taken in the following.

[0084] The processor 71 executes various functional applications and data processing of the device by running the software programs, instructions and modules stored in the memory 72, that is, realizes the above-mentioned hybrid transmission hydraulic control method.

[0085] The electronic device provided above can be used to execute the hybrid transmission hydraulic control method provided in the above embodiment, and has corresponding functions and beneficial effects.

[0086] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium, which includes a stored computer program; wherein, when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the hybrid transmission hydraulic control method as described above, and can achieve the same beneficial effects.

[0087] Of course, the storage medium containing computer executable instructions provided in the embodiment of the present application, whose computer executable instructions are not limited to the hybrid transmission hydraulic control method as described above, can also execute related operations in the hybrid transmission hydraulic control method provided in any embodiment of the present application.

[0088] The computer program or instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disk; it may also be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0089] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0090] In addition, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0091] If the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for an electronic 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. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0092] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0093] The above is only a specific implementation 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. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0094] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants 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, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A hybrid transmission hydraulic control system, characterized in that: include: A hydraulic oil tank, a mechanical oil pump, an electric oil pump, a first slide valve, a second slide valve, a pressure control assembly, a drive motor cooling and lubrication system, a generator cooling and lubrication system, and an engine cooling and lubrication system, wherein the mechanical oil pump and the electric oil pump are respectively connected to the hydraulic oil tank, the electric oil pump is connected to the drive motor cooling and lubrication system, the generator cooling and lubrication system, and the engine cooling and lubrication system, the mechanical oil pump is connected to the pressure control assembly, the pressure control assembly is respectively connected to the first slide valve and the second slide valve, the first slide valve is connected to the second slide valve, and the second slide valve is respectively connected to the generator cooling and lubrication system and the engine cooling and lubrication system; When the mechanical oil pump and / or the electric oil pump is working, the hydraulic oil is delivered to the drive motor cooling and lubrication system, the generator cooling and lubrication system and the engine cooling and lubrication system; When the mechanical oil pump is working, the pressure control component applies a first pressure to the first slide valve to control the first slide valve and the second slide valve to turn on a first switch, thereby delivering a set amount of hydraulic oil to the generator cooling and lubrication system; When the mechanical oil pump is working, the pressure control component applies a first pressure to the first slide valve and a second pressure to the second slide valve to control the first slide valve and the second slide valve to turn on the second switch to deliver a set amount of hydraulic oil to the engine cooling and lubrication system.

2. The hybrid transmission hydraulic control system according to claim 1, characterized in that: It also includes a first mechanical slide valve, a clutch control module and a gear selection and shift control module, wherein the mechanical oil pump is respectively connected to the first slide valve, the pressure control component, the first mechanical slide valve, the clutch control module and the gear selection and shift control module through a first oil circuit; The clutch control module is connected to the clutch control system via a fourth oil circuit, and the gear selection and shift control module is connected to the gear selection and shift control system via a fifth oil circuit.

3. The hybrid transmission hydraulic control system according to claim 2, characterized in that: The pressure control assembly includes a first solenoid valve, the first solenoid valve is respectively connected to the second slide valve and the first mechanical slide valve through a second oil circuit, and a damping accumulator is provided on the second oil circuit.

4. The hybrid transmission hydraulic control system according to claim 2, characterized in that: The sixth oil circuit of the electric oil pump merges with the third oil circuit output by the first mechanical slide valve to form a seventh oil circuit. The seventh oil circuit outputs an eighth oil circuit after passing through a cooler and a low-pressure filter. The eighth oil circuit is connected to the first slide valve through a tenth oil circuit, and the eighth oil circuit is respectively connected to the drive motor cooling and lubrication system, the generator cooling and lubrication system and the engine cooling and lubrication system through a ninth oil circuit; the first slide valve is connected to the second slide valve through an eleventh oil circuit.

5. The hybrid transmission hydraulic control system according to claim 4, characterized in that: A first fixed throttle hole is provided on the oil circuit connecting the ninth oil circuit and the drive motor cooling lubrication system, a second fixed throttle hole is provided on the oil circuit connecting the ninth oil circuit and the generator cooling lubrication system, and a third fixed throttle hole is provided on the oil circuit connecting the ninth oil circuit and the engine cooling lubrication system; A fourth fixed throttle hole is provided on the oil passage connecting the second slide valve and the engine cooling lubrication system, and a fifth fixed throttle hole is provided on the oil passage connecting the second slide valve and the generator cooling lubrication system.

6. The hybrid transmission hydraulic control system according to claim 2, characterized in that: The hydraulic oil tank is provided with an oil suction filter, and the first oil circuit is provided with a pressure limiting safety valve.

7. A hybrid transmission hydraulic control method, applied to the hybrid transmission hydraulic control system according to any one of claims 1 to 6, characterized in that: include: When the mechanical oil pump and / or the electric oil pump is working, the hydraulic oil is delivered to the drive motor cooling and lubrication system, the generator cooling and lubrication system and the engine cooling and lubrication system; When the mechanical oil pump is working, the pressure control component applies a first pressure to the first slide valve to control the first slide valve and the second slide valve to turn on a first switch, thereby delivering a set amount of hydraulic oil to the generator cooling and lubrication system; When the mechanical oil pump is working, the pressure control component applies a first pressure to the first slide valve and a second pressure to the second slide valve to control the first slide valve and the second slide valve to turn on the second switch to deliver a set amount of hydraulic oil to the engine cooling and lubrication system.

8. The hybrid transmission hydraulic control method according to claim 7, characterized in that: The pressure control component controls the first slide valve and the second slide valve to conduct a first switch by applying a first pressure to the first slide valve, comprising: Control the current of the first solenoid valve to be 0, the pressure of the second oil circuit to be 0, and the first oil circuit to establish pressure and maintain a preset pressure value; The right control port of the first slide valve is in communication with the first oil circuit, the right control port of the second slide valve is in communication with the second oil circuit, there is pressure in the right control port of the first slide valve, the pressure in the right control port of the second slide valve is 0, and the second slide valve works in the first switch position under the action of the left compression spring; The first oil circuit applies pressure to the first slide valve, so that the first slide valve is turned on, the tenth oil circuit is connected to the eleventh oil circuit, and the eighth oil circuit transmits the first part of the hydraulic oil to the ninth oil circuit; The eighth oil circuit conveys the second part of the hydraulic oil to the eleventh oil circuit via the tenth oil circuit, and conveys the second part of the hydraulic oil to the generator cooling lubrication system via the second slide valve and the fifth fixed throttle hole.

9. The hybrid transmission hydraulic control method according to claim 7, characterized in that: The pressure control component applies a first pressure to the first slide valve and a second pressure to the second slide valve to control the first slide valve and the second slide valve to conduct the second switch, comprising: The current of the first solenoid valve is controlled to be non-zero, the pressure of the second oil circuit is controlled to be non-zero, and the first oil circuit builds up pressure and maintains a preset pressure value; The right control port of the first slide valve is in communication with the first oil circuit, the right control port of the second slide valve is in communication with the second oil circuit, pressure exists in the right control port of the first slide valve, and pressure exists in the right control port of the second slide valve; The first oil circuit applies pressure to the first slide valve, so that the first slide valve is turned on; the second oil circuit applies pressure to the second slide valve, and the second slide valve works in the second switch position under the action of pressure; the tenth oil circuit is connected to the eleventh oil circuit; and the eighth oil circuit transmits the first part of the hydraulic oil to the ninth oil circuit; The eighth oil circuit delivers the second part of the hydraulic oil to the eleventh oil circuit via the tenth oil circuit, and delivers the hydraulic oil to the engine cooling lubrication system via the second slide valve and the fourth fixed throttle hole.

10. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the processor is connected to the memory via the bus, and the memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, they are used to implement the hybrid transmission hydraulic control method as described in any one of claims 7 to 9.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which, when executed by a server, implements the hybrid transmission hydraulic control method as described in any one of claims 7 to 9.

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