Hydraulic control system and method for hybrid transmission

Abstract

This application provides a hydraulic control system and method for a hybrid power transmission, relating to the field of transmission hydraulic control technology. The system includes: a hydraulic oil tank, a mechanical oil pump, an electric oil pump, a first spool valve, a second spool 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. The mechanical and electric oil pumps supply hydraulic oil to the drive motor cooling and lubrication system, the generator cooling and lubrication system, and the engine cooling and lubrication system. The pressure control component, the first spool valve, and the second spool valve enable different cooling flow distribution ratios for the three modes of the drive motor cooling and lubrication system, the generator cooling and lubrication system, and the engine cooling and lubrication system. The cooling flow distribution ratio automatically switches according to the hybrid transmission's operating mode, eliminating the need for active adjustment. This significantly reduces system cost and control software complexity, and improves hydraulic system efficiency.

Description

Technical Field

[0001] This application relates to the field of hydraulic control technology for transmissions, and more specifically, to a hydraulic control system and method for a hybrid power transmission. Background Technology

[0002] Traditional dual-motor hybrid transmission hydraulic systems typically use fixed orifices to distribute cooling flow to components in the drive motor, generator, and engine circuits. The distribution ratio between these circuits remains constant, and the cooling flow requirements of each component can only be met by changing the total cooling flow. However, the cooling flow requirements of the drive motor, generator, and engine circuits vary significantly depending on the hybrid transmission's operating mode. A fixed orifice approach necessitates increasing the total cooling flow to meet the maximum cooling requirements of each component. This obviously requires increasing the hydraulic oil source power and using a larger displacement oil pump, leading to increased costs and structural dimensions. It's understandable that while a fixed orifice approach meets the maximum cooling flow requirement of one circuit, it inevitably increases the cooling flow allocated to other circuits. This results in wasted flow, reducing hydraulic system efficiency, and excessive cooling flow to other circuits may also cause greater oil churning losses, further reducing system efficiency.

[0003] To address the aforementioned issues, a common solution is to install a flow distribution solenoid valve in the cooling and lubrication module. Theoretically, this can achieve two to three flow distribution ratios. However, in practice, due to difficulties in measuring the actual flow rate in the transmission, the increased pressure drop caused by the solenoid valve spool travel limitation, and the difficulty in ensuring solenoid valve consistency, it is difficult to implement. Furthermore, installing a flow distribution solenoid valve would significantly increase costs, additionally occupy control system ports in the electronic control system, and increase the complexity of the control software. Summary of the Invention

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

[0005] In a first aspect, embodiments of this application provide a hydraulic control system for a hybrid power transmission, comprising: a hydraulic oil tank, a mechanical oil pump, an electric oil pump, a first spool valve, a second spool 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. 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 spool valve and the second spool valve. The first spool valve is connected to the second spool valve. The second spool 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 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;

[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 open a first switch, 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 open a second switch, thereby delivering a set amount of hydraulic oil to the engine cooling and lubrication system.

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

[0010] Furthermore, it also includes a first mechanical spool valve, a clutch control module, and a gear shifting control module. The mechanical oil pump is connected to the first spool valve, the pressure control component, the first mechanical spool valve, the clutch control module, and the gear shifting control module respectively through a first oil circuit.

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

[0012] In the above implementation process, when the oil flow rate of the first oil circuit can meet the requirements of the clutch control module and the gear shifting control module, the excess flow rate 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 the oil utilization rate and thus improving the system efficiency.

[0013] Furthermore, the pressure control component includes a first solenoid valve, which is connected to the second slide valve and the first mechanical slide valve respectively via a second oil circuit, and a vibration 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 realizing the 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 from the first mechanical slide valve to form the 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 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 process, the oil circuit formed between the various components allows for the flow of hydraulic oil, thus meeting the supply needs of hydraulic oil.

[0017] Furthermore, the ninth oil circuit is provided with a first fixed throttling orifice on the oil circuit connecting to the drive motor cooling and lubrication system, a second fixed throttling orifice on the oil circuit connecting to the generator cooling and lubrication system, and a third fixed throttling orifice on the oil circuit connecting to the engine cooling and lubrication system.

[0018] The second slide valve is provided with a fourth fixed throttling orifice on the oil line connecting it to the engine cooling and lubrication system, and the second slide valve is provided with a fifth fixed throttling orifice on the oil line connecting it to the generator cooling and lubrication system.

[0019] In the above implementation process, the hydraulic oil flow rate of the corresponding oil circuit is controlled by setting multiple fixed throttle orifices to avoid inconvenience caused by excessive hydraulic oil flow.

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

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

[0022] Secondly, embodiments of this application provide a hydraulic control method for a hybrid power transmission, applied to the hydraulic control system of a hybrid power transmission as described above, comprising:

[0023] When the mechanical oil pump and / or the electric oil pump 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;

[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 open a first switch, 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 open a second switch, thereby delivering a set amount of hydraulic oil to the engine cooling and lubrication system.

[0026] Furthermore, the pressure control component controls the first and second slide valves to conduct a first switch by applying a first pressure to the first slide valve, including:

[0027] The current of the first solenoid valve is controlled to be 0, the pressure of the second oil circuit is 0, and the pressure of the first oil circuit is established and maintained at a preset pressure value.

[0028] The right control port of the first slide valve is connected to the first oil circuit, and 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, and the pressure at the right control port of the second slide valve is 0. The second slide valve operates 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, causing the first slide valve to open. The tenth oil circuit is connected to the eleventh oil circuit, and the eighth oil circuit delivers a first portion of hydraulic oil to the ninth oil circuit.

[0030] The eighth oil circuit delivers the second portion of hydraulic oil to the eleventh oil circuit via the tenth oil circuit, and then delivers it to the generator cooling and lubrication system through the second slide valve and the fifth fixed throttle orifice.

[0031] Furthermore, the pressure control component controls the first and second slide valves to conduct a second switch by applying a first pressure to the first slide valve and a second pressure to the second slide valve, including:

[0032] The current of the first solenoid valve is not zero, the pressure of the second oil circuit is not zero, and the pressure of the first oil circuit is established and maintained at a preset pressure value.

[0033] The right control port of the first slide valve is connected to the first oil circuit, and 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 and there is pressure at the right control port of the second slide valve.

[0034] The first oil circuit applies pressure to the first slide valve, causing the first slide valve to open. 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. The eighth oil circuit delivers a first portion of hydraulic oil to the ninth oil circuit.

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

[0036] Thirdly, embodiments of this application provide an electronic device, including:

[0037] The system includes a processor, a memory, and a bus. The processor is connected to the memory via the bus. The memory stores computer-readable instructions that, when executed by the processor, are used to implement the hydraulic control method for a hybrid transmission as described above.

[0038] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a server, implements the hydraulic control method for a hybrid transmission as described above. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

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

[0041] Figure 2 A schematic flowchart illustrating a hydraulic control method for a hybrid transmission provided in this application embodiment;

[0042] Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;

[0043] The system comprises: 1. First oil circuit; 2. Second oil circuit; 3. Third oil circuit; 4. Fourth oil circuit; 5. Fifth oil circuit; 6. Sixth oil circuit; 7. Seventh oil circuit; 8. Eighth oil circuit; 9. Ninth oil circuit; 10. Tenth oil circuit; 11. Eleventh oil circuit; 101. Hydraulic oil tank; 102. Suction filter; 103. Mechanical oil pump; 104. Electric oil pump; 105. First solenoid valve; 106. First mechanical slide valve; 107. Vibration damping accumulator; 108. Pressure limiting safety valve; 109. Clutch control module; 110. Gear shifting control module; 111. Cooler; 112. Low-pressure filter; 113. First slide valve; 114. Second slide valve; 115. First fixed throttle orifice; 116. Second fixed throttle orifice; 117. Third fixed throttle orifice; 118. Fourth fixed throttle orifice; 119. Fifth fixed throttle orifice. Detailed Implementation

[0044] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0045] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] Please refer to Figure 1 , Figure 1This is a schematic diagram of a hydraulic control system for a hybrid power transmission provided in an embodiment of this application. The 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. 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] 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 open a first switch, 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 open a second switch, delivering a set amount of hydraulic oil to the engine cooling and lubrication system.

[0048] Optionally, the mechanical oil pump 103 is powered by an 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 system costs; the speed and output flow of the electric oil pump 104 can be adjusted according to control requirements.

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

[0050] As described above, the embodiments of this application provide a mechanical oil pump 103 and an electric oil pump 104 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. A pressure control component, a first slide valve 113, and a second slide valve 114 are provided to achieve different cooling flow distribution ratios for the three modes of the drive motor cooling and lubrication system, the generator cooling and lubrication system, and the engine cooling and lubrication system. The cooling flow distribution ratio automatically switches according to the hybrid transmission's operating mode without requiring active adjustment, which can significantly reduce system costs and control software complexity, and improve hydraulic system efficiency.

[0051] In some embodiments, the system further includes a first mechanical spool valve 106, a clutch control module 109, and a gear shifting control module 110. The mechanical oil pump 103 is connected to the first spool valve 113, the pressure control component, the first mechanical spool valve 106, the clutch control module 109, and the gear shifting control module 110 via a first oil circuit 1. The clutch control module 109 is connected to the clutch control system via a fourth oil circuit 4, and the gear shifting control module 110 is connected to the gear shifting control system via a fifth oil circuit 5. When the oil flow rate in the first oil circuit 1 is sufficient to meet the requirements of the clutch control module 109 and the gear shifting control module 110, the excess flow rate in the first oil circuit 1 can be transported to the third oil circuit 3 via the first mechanical spool valve 106 for use by the cooling and lubrication system, thereby improving oil utilization and system efficiency.

[0052] In some embodiments, the pressure control component includes a first solenoid valve 105, which is connected to the second slide valve 114 and the first mechanical slide valve 106 via a second oil passage 2. The second oil passage 2 is provided with a vibration damping accumulator 107. With the cooperation of the first solenoid valve 105 and the first mechanical slide valve 106, the pressure of the first oil passage 1 can be changed by changing the command current of the first solenoid valve 105, thereby achieving pressure regulation of the first oil passage 1.

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

[0054] Optionally, the first solenoid valve 105 is a constant low-pressure type, 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 passage 6 of the electric oil pump 104 merges with the third oil passage 3 output from the first mechanical slide valve 106 to form a seventh oil passage 7. The seventh oil passage 7 outputs an eighth oil passage 8 after passing through the cooler 111 and the low-pressure filter 112. The eighth oil passage 8 is connected to the first slide valve 113 through the tenth oil passage 10, and the eighth oil passage 8 is connected to the drive motor cooling and lubrication system, the generator cooling and lubrication system, and the engine cooling and lubrication system through the ninth oil passage 9, respectively. The first slide valve 113 is connected to the second slide valve 114 through the eleventh oil passage 11. The oil passages formed between the various components provide hydraulic oil for supply.

[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 from the hydraulic oil in the seventh pipeline, effectively controlling the contamination level of the hydraulic fluid.

[0057] Understandably, hybrid vehicles typically have multiple driving modes, and the clutch control module 109 and gear shifting module only require control when the engine is involved in driving. In the series operation condition where the engine is running but not participating in driving, the normally low-pressure solenoid valve, in conjunction with the first slide valve 113, can maintain the mechanical oil pump 103 load pressure at a low preset value (e.g., 3 bar). This means the mechanical oil pump 103 load pressure is low, energy consumption is reduced, and system efficiency is improved. Simultaneously, the flow rate in the first oil circuit 1 can be delivered to the third oil circuit 3 via the first mechanical slide valve 106 for cooling and lubrication, improving oil utilization and thus increasing system efficiency.

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

[0059] In some embodiments, the hydraulic oil tank 101 is provided with an oil suction filter 102, and the first oil circuit 1 is provided with a pressure limiting safety valve 108. The oil suction filter 102 is provided to filter out impurities and particles in the oil, preventing these impurities from entering the hydraulic system, thereby protecting the pump, valves and other precision components. The pressure limiting safety valve 108 is provided in parallel on the first oil circuit 1. 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, ensuring system safety and addressing the problem of excessive oil pressure rise in the first oil circuit 1 caused by jamming of the first mechanical slide valve 106 or other abnormal conditions.

[0060] Specifically, the hydraulic control system of the hybrid transmission consists 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 spool valve 106, a vibration damping accumulator 107, a pressure limiting safety valve 108, a clutch control module 109, a gear selection control module 110, a cooler 111, a low-pressure filter 112, a first spool valve 113, a second spool valve 114, a first fixed throttle orifice 115, a second fixed throttle orifice 116, a third fixed throttle orifice 117, a fourth fixed throttle orifice 118, a fifth fixed throttle orifice 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 regulation process: The pressure of the first oil circuit 1 is usually referred to as the main oil circuit pressure. Initially, the pressure in 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 a state of... Figure 1 As shown in the left working position, the first oil passage 1 and the third oil passage 3 are not connected. When the mechanical oil pump 103 is running, the oil in the hydraulic oil tank 101 first flows through the suction filter 102, and then through the mechanical oil pump 103 to the first oil passage 1. Because the first oil passage 1 and the third oil passage 3 are not connected, the first oil passage 1 begins to build up pressure. For the first mechanical spool valve 106, the compression spring on its left side will generate a rightward force on the valve core, and the pressure from the second oil passage 2 on its left side will also generate a rightward force on the valve core. The resultant force of these two forces interacts with the first mechanical spool valve 106. Figure 1 The forces acting on the right side are balanced. The force acting on the right side of the first mechanical slide valve 106 is positively correlated with the pressure in 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 in 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 in the first oil circuit 1 can be changed by altering the command current of the first solenoid valve 105.

[0062] Cooling and lubrication flow replenishment process: As the pressure in the first oil circuit 1 gradually increases and reaches the left-side force of the first mechanical spool valve 106, the valve core of the first mechanical spool valve 106 gradually moves, its left-side spring is further compressed, and the valve core gradually moves to... Figure 1 As shown on the right, the first oil circuit 1 is connected to the third oil circuit 3. When the oil flow rate of the first oil circuit 1 can meet the requirements of the clutch control module 109 and the gear shift control module 110, the excess flow rate in the first oil circuit 1 is 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.

[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 suction filter 102, and then through the electric oil pump 104 to the sixth oil line 6. After merging with the oil in the third oil line 3, it is delivered to the seventh oil line 7. After being cooled and further filtered by the cooler 111 and the low-pressure filter 112, it is delivered to the eighth oil line 8.

[0064] For example, please refer to Figure 1 When the hybrid transmission operates in pure electric mode, the engine does not run, the mechanical oil pump 103 does not work, the pressure in the first oil circuit 1 is 0, the current in the first solenoid valve 105 is 0, and the pressure in 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 at the right control port of the first slide valve 113 is 0, the pressure at the right control port of the second slide valve 114 is 0, and the first slide valve 113 operates under the action of the left compression spring. Figure 1 As shown in the left position (i.e., the first slide valve 113 is not conducting), the second slide valve 114 operates under the action of the left compression spring. Figure 1 As shown in the left position (i.e., the second slide valve 114 is not conducting), no hydraulic oil flows 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 then through the first fixed throttle orifice 115, the second fixed throttle orifice 116, and the third fixed throttle orifice 117 to the drive motor route (i.e., drive motor cooling and lubrication system), the generator route (i.e., generator cooling and lubrication system), and the engine route (i.e., engine cooling and lubrication system), respectively, for cooling and lubrication of various components in each route. By reasonably setting the parameters of the first fixed throttle orifice 115, the second fixed throttle orifice 116, and the third fixed throttle orifice 117, the maximum cooling flow requirement of the drive motor route in pure electric mode can be achieved, realizing effective distribution of cooling and lubrication flow, reducing cooling flow waste, and improving system efficiency.

[0065] When the hybrid transmission operates in series mode, the engine runs, the mechanical oil pump 103 operates, 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 at the right control port of the first slide valve 113, and the pressure at the right control port of the second slide valve 114 is 0. The second slide valve 114 operates under the action of the left compression spring, and the first switch of the second slide valve 114 is turned on (i.e., the second slide valve 114 connects to the fifth fixed throttle orifice 119). By designing the opening pressure of the first slide valve 113, the first slide valve 113 operates in this mode... Figure 1 As shown on the right side (i.e., the first slide valve 113 is open), the tenth oil circuit 10 and the eleventh oil circuit 11 are connected. At this time, a portion of the hydraulic oil in the eighth oil circuit 8 is delivered to the ninth oil circuit 9, and then through the first fixed throttle orifice 115, the second fixed throttle orifice 116, and the third fixed throttle orifice 117 to the drive motor circuit, the generator circuit, and the engine circuit, respectively, for cooling and lubrication of the components under each circuit; the other portion of the hydraulic oil in the eighth oil circuit 8 is delivered to the eleventh oil circuit 11 via the tenth oil circuit 10, and then through the fifth fixed throttle orifice 119 to the generator circuit, for cooling and lubrication of the components under the generator circuit. Obviously, in this mode, the components under the generator circuit can be allocated more cooling and lubrication flow. By setting the parameters of the fifth fixed throttle orifice 119, the maximum cooling flow requirement of the generator circuit in series mode can be achieved, realizing effective allocation of cooling and lubrication flow, reducing cooling flow waste, and improving system efficiency.

[0066] When the hybrid transmission operates in parallel mode or engine direct drive mode, the engine runs, the mechanical oil pump 103 operates, the current of the first solenoid valve 105 is not zero, the pressure of the second oil circuit 2 is not zero, the first oil circuit 1 establishes 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 both the first and second slide valves. By designing the opening pressure of the first slide valve 113, the first slide valve 113 operates in this mode... Figure 1The right-hand position is shown (i.e., the first slide valve 113 is open); by designing the opening pressure of the second slide valve 114, the second slide valve 114 operates in this mode, and the second slide valve 114 opens the second switch (i.e., the second slide valve 114 connects to the fourth fixed throttle orifice 118), connecting the tenth oil circuit 10 and the eleventh oil circuit 11. At this time, a portion of the hydraulic oil in the eighth oil circuit 8 is transported to the ninth oil circuit 9, and then through the first fixed throttle orifice 115, the second fixed throttle orifice 116, and the third fixed throttle orifice 117 to the drive motor circuit, the generator circuit, and the engine circuit, respectively, for cooling and lubrication of the components under each circuit; another portion of the hydraulic oil in the eighth oil circuit 8 is transported through the tenth oil circuit 10 to the eleventh oil circuit 11, and then through the fourth fixed throttle orifice 118 to the engine circuit, for cooling and lubrication of the components under the engine circuit. Understandably, in this mode, the components under the engine route can be allocated more cooling and lubrication flow. By reasonably setting the parameters of the fourth fixed throttle orifice 118, the maximum cooling flow requirement of the engine route in parallel mode or engine direct drive mode can be achieved, realizing effective distribution of cooling and lubrication flow, reducing cooling flow waste, and improving system efficiency.

[0067] The hydraulic system solution provided in the above-described embodiments can achieve different cooling flow distribution ratios under three modes: drive motor route, generator route, and engine route. Furthermore, the cooling flow distribution ratio automatically switches according to the hybrid transmission's operating mode without requiring active adjustment. This significantly reduces system costs and control software complexity, improves hydraulic system efficiency, and effectively solves existing problems.

[0068] Secondly, based on the above embodiments, Figure 2 This is a schematic flowchart illustrating a hydraulic control method for a hybrid power transmission provided in an embodiment of this application. (Reference) Figure 2 The hydraulic control method for a hybrid transmission provided in this embodiment specifically includes:

[0069] 100. When the mechanical oil pump and / or the electric oil pump 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.

[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 open a 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 0, the pressure of the second oil circuit to 0, and establish and maintain the pressure value of the first oil circuit.

[0072] 220. The right control port of the first slide valve is connected to the first oil circuit, and 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, and the pressure at the right control port of the second slide valve is 0. The second slide valve operates 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, causing the first slide valve to open, the tenth oil circuit is connected to the eleventh oil circuit, and the eighth oil circuit delivers a first portion of hydraulic oil to the ninth oil circuit.

[0074] 240. The eighth oil circuit delivers the second portion of hydraulic oil to the eleventh oil circuit via the tenth oil circuit, and then delivers it to the generator cooling and lubrication system via the second slide valve and the fifth fixed throttle orifice.

[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 open a 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-zero, the pressure of the second oil circuit to be non-zero, and establish and maintain the pressure of the first oil circuit at a preset pressure value.

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

[0078] 330. The first oil circuit applies pressure to the first slide valve, causing the first slide valve to open. 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. The eighth oil circuit delivers a first portion of hydraulic oil to the ninth oil circuit.

[0079] 340. The eighth oil circuit delivers a second portion of hydraulic oil to the eleventh oil circuit via the tenth oil circuit, and then delivers it to the engine cooling and lubrication system via the second slide valve and the fourth fixed throttle orifice.

[0080] As described above, in this embodiment, a mechanical oil pump and an electric oil pump supply hydraulic oil to the drive motor cooling and lubrication system, the generator cooling and lubrication system, and the engine cooling and lubrication system. A pressure control component, a first slide valve, and a second slide valve are provided to achieve different cooling flow distribution ratios for the three modes of the drive motor cooling and lubrication system, the generator cooling and lubrication system, and the engine cooling and lubrication system. Moreover, the cooling flow distribution ratio automatically switches according to the hybrid transmission's operating mode without requiring active adjustment. This can significantly reduce system costs and control software complexity, and improve hydraulic system efficiency.

[0081] The steps described above are not strictly performed in the order of their numbers; they should be understood as a whole.

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

[0083] Thirdly, embodiments of this application also provide an electronic device that can integrate the hybrid power transmission hydraulic control system provided in embodiments of this application. Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. (Reference) 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 stores one or more programs. When the one or more programs are executed by the one or more processors 71, the one or more processors 71 implement the hybrid power transmission hydraulic control method provided in the above embodiments. The input device 73, output device 74, memory 72, and processors 71 can be connected via a bus or other means. Figure 3 Taking the example of a connection between China and Israel via a bus.

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

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

[0086] Fourthly, embodiments of this application also provide a computer-readable storage medium, which includes a stored computer program; wherein, when the computer program is running, it controls the device where the computer-readable storage medium is located to execute the hydraulic control method for a hybrid transmission as described above, and can achieve the same beneficial effects.

[0087] Of course, the computer-executable instructions provided in the embodiments of this application are not limited to the hybrid transmission hydraulic control method described above, but can also execute related operations in the hybrid transmission hydraulic control method provided in any embodiment of this application.

[0088] The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access, 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, hard disk, or magnetic tape; or an optical medium, such as a digital video optical disc; or 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 the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

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

[0091] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause an electronic device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0092] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0093] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0094] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A hydraulic control system for a hybrid power transmission, characterized in that, include: The system includes 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. 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. 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 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 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 open a first switch, 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 open a second switch, thereby delivering a set amount of hydraulic oil to the engine cooling and lubrication system; It also includes a first mechanical spool valve, a clutch control module, and a gear shifting control module. The mechanical oil pump is connected to the first spool valve, the pressure control component, the first mechanical spool valve, the clutch control module, and the gear shifting control module respectively through a first oil circuit. The clutch control module is connected to the clutch control system via the fourth oil circuit, and the gear shifting control module is connected to the gear shifting control system via the fifth oil circuit. The pressure control component includes a first solenoid valve, which is connected to the second slide valve and the first mechanical slide valve respectively through a second oil circuit. A vibration damping accumulator is provided on the second oil circuit.

2. The hydraulic control system for a hybrid transmission according to claim 1, characterized in that, The sixth oil circuit of the electric oil pump merges with the third oil circuit output from the first mechanical slide valve to form the 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 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.

3. The hydraulic control system for a hybrid transmission according to claim 2, characterized in that, The ninth oil circuit is provided with a first fixed throttling orifice on the oil circuit connecting to the drive motor cooling and lubrication system, the ninth oil circuit is provided with a second fixed throttling orifice on the oil circuit connecting to the generator cooling and lubrication system, and the ninth oil circuit is provided with a third fixed throttling orifice on the oil circuit connecting to the engine cooling and lubrication system. The second slide valve is provided with a fourth fixed throttling orifice on the oil line connecting it to the engine cooling and lubrication system, and the second slide valve is provided with a fifth fixed throttling orifice on the oil line connecting it to the generator cooling and lubrication system.

4. The hydraulic control system for a hybrid transmission according to claim 1, characterized in that, The hydraulic oil tank is equipped with an oil suction filter, and the first oil line is equipped with a pressure limiting safety valve.

5. A hydraulic control method for a hybrid transmission, applied to the hydraulic control system of a hybrid transmission as described in claim 3, characterized in that, include: When the mechanical oil pump and / or the electric oil pump 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 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 open a first switch, 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 open a second switch, thereby delivering a set amount of hydraulic oil to the engine cooling and lubrication system.

6. The hydraulic control method for a hybrid transmission according to claim 5, characterized in that, The pressure control component controls the first and second slide valves to conduct a first switch by applying a first pressure to the first slide valve, including: The current of the first solenoid valve is controlled to be 0, the pressure of the second oil circuit is 0, and the pressure of the first oil circuit is established and maintained at a preset pressure value. The right control port of the first slide valve is connected to the first oil circuit, and 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, and the pressure at the right control port of the second slide valve is 0. The second slide valve operates in the first switch position under the action of the left compression spring. The first oil circuit applies pressure to the first slide valve, causing the first slide valve to open. The tenth oil circuit is connected to the eleventh oil circuit, and the eighth oil circuit delivers a first portion of hydraulic oil to the ninth oil circuit. The eighth oil circuit delivers the second portion of hydraulic oil to the eleventh oil circuit via the tenth oil circuit, and then delivers it to the generator cooling and lubrication system through the second slide valve and the fifth fixed throttle orifice.

7. The hydraulic control method for a hybrid transmission according to claim 5, characterized in that, The pressure control component controls the first and second slide valves to conduct a second switch by applying a first pressure to the first slide valve and a second pressure to the second slide valve, including: The current of the first solenoid valve is not zero, the pressure of the second oil circuit is not zero, and the pressure of the first oil circuit is established and maintained at a preset pressure value. The right control port of the first slide valve is connected to the first oil circuit, and 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 and there is pressure at the right control port of the second slide valve. The first oil circuit applies pressure to the first slide valve, causing the first slide valve to open. 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. The eighth oil circuit delivers a first portion of hydraulic oil to the ninth oil circuit. The eighth oil circuit delivers a second portion of hydraulic oil to the eleventh oil circuit via the tenth oil circuit, and then delivers it to the engine cooling and lubrication system via the second slide valve and the fourth fixed throttle orifice.

8. An electronic device, characterized in that, include: The system includes 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 that, when executed by the processor, are used to implement the hydraulic control method for a hybrid transmission as described in any one of claims 5-7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a server, implements the hydraulic control method for a hybrid transmission as described in any one of claims 5-7.

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