Electric drive assembly hydraulic control system

Abstract

The application discloses a kind of electric drive assembly hydraulic control system, comprising: oil sump, oil sump is connected with electronic oil pump, electronic oil pump is connected with cooler and pressure filter, cooler is connected with actuator lubrication branch, motor lubrication branch and pinion shaft lubrication branch;Pressure filter is connected with first switch solenoid valve and second switch solenoid valve, second switch solenoid valve is respectively connected with first piston cylinder, second piston cylinder and third switch solenoid valve, second switch solenoid valve is connected with first piston cylinder by parking actuator oil circuit, and is connected with second piston cylinder and third switch solenoid valve by actuator oil circuit, first piston cylinder is connected with parking actuator, second piston cylinder is connected with actuator, third switch solenoid valve and first switch solenoid valve are connected with electronic oil pump.The electric drive assembly hydraulic control system provided by the application meets the demand of gear shifting, parking action demand and motor, actuator, gear pair cooling and lubrication demand simultaneously.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control technology, and in particular to a hydraulic control system for an electric drive assembly. Background Technology

[0002] Electric drive systems are a crucial component of the future automotive industry supply chain. As vehicle manufacturers place increasingly higher demands on the performance and functionality of electric drive assemblies, requirements include increased motor speeds, multi-speed reducers (upgrading from single-speed to two-speed reducers), and the inclusion of parking mechanisms. These evolving requirements necessitate a solution that meets the demands of gear shifting, parking actuator operation, and lubrication of the motor and gear pairs.

[0003] Therefore, there is an urgent need for a hydraulic control system for electric drive assemblies. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic control system for an electric drive assembly to solve the problems in the prior art, and to simultaneously meet the requirements of gear shifting, parking action, and cooling and lubrication of the motor, actuator, gear pair, etc.

[0005] This invention provides a hydraulic control system for an electric drive assembly, comprising:

[0006] An oil pan is connected to an electronic oil pump, which is connected to a cooler and a pressure filter. The cooler is connected to a lubrication branch for the actuator, a lubrication branch for the motor, and a lubrication branch for the gear shaft. The lubrication branch for the actuator is connected to the actuator, the lubrication branch for the motor is connected to the motor, and the lubrication branch for the gear shaft is connected to the gear pair. The pressure filter is connected to a first solenoid valve and a second solenoid valve. The second solenoid valve is connected to a first piston cylinder, a second piston cylinder, and a third solenoid valve. The second solenoid valve is connected to the first piston cylinder via a parking actuator oil circuit. The second solenoid valve is connected to the second piston cylinder and the third solenoid valve via an actuator oil circuit. The first piston cylinder is connected to the parking actuator, the second piston cylinder is connected to the actuator, and the third solenoid valve and the first solenoid valve are connected to the electronic oil pump.

[0007] In the above-described electric drive assembly hydraulic control system, preferably, the electronic oil pump includes an oil pump motor, a low-pressure oil pump, and a high-pressure oil pump.

[0008] In the above-described hydraulic control system for the electric drive assembly, preferably, the inlet of the low-pressure oil pump is connected to the oil pan, a suction filter is provided between the oil pan and the low-pressure oil pump, the low-pressure oil pump is connected to the cooler through a low-pressure oil circuit, and the cooler is connected to the actuator lubrication branch, the motor lubrication branch and the gear shaft lubrication branch through the low-pressure oil circuit respectively.

[0009] In the above-described hydraulic control system for the electric drive assembly, preferably, the inlet of the high-pressure oil pump is connected to the oil pan, the high-pressure oil pump is connected to the pressure filter via a high-pressure oil circuit, the pressure filter is connected to the first solenoid valve and the second solenoid valve via the high-pressure oil circuit, and the third solenoid valve and the first solenoid valve are connected to the high-pressure oil pump.

[0010] In the electric drive assembly hydraulic control system described above, preferably, the second switching solenoid valve is connected to the inlet of the second piston cylinder and the third switching solenoid valve via an actuator oil circuit, and the outlets of the third switching solenoid valve and the first switching solenoid valve are connected to the inlet of the high-pressure oil pump.

[0011] In the hydraulic control system of the electric drive assembly described above, preferably, when the parking actuator performs the parking function, the first solenoid valve is in the open state, so that the inlet and outlet are not connected; the second solenoid valve is in the second position, so that the inlet of the second solenoid valve is connected to the oil circuit of the parking actuator; the electronic oil pump is in the start state, so as to provide pressurized oil to the first piston cylinder, pushing the piston rod to move to the left, so that the parking actuator performs the parking function; during the process of maintaining the parking function, the second solenoid valve is in the first position, and the electronic oil pump and the third solenoid valve are in the closed state, so that the oil circuit of the parking actuator continues to maintain pressure and the parking function continues to be maintained.

[0012] In the above-described hydraulic control system for the electric drive assembly, preferably, when the parking actuator disengages from the parking function, the second solenoid valve is in the second position, so that the pressure oil in the parking actuator oil circuit returns to the inlet of the high-pressure oil pump along the second solenoid valve and the third solenoid valve, and the piston rod moves to the right under the action of the spring, so that the parking actuator disengages from the parking function.

[0013] In the above-described hydraulic control system for the electric drive assembly, preferably, when the actuator performs an action, the second solenoid valve is in the second position, so that the inlet of the second solenoid valve is connected to the oil circuit of the actuator; the third solenoid valve and the first solenoid valve are in the open state, so that the inlet and outlet of the third solenoid valve and the first solenoid valve are not connected; the electronic oil pump is in the start state, so as to supply pressurized oil to the second piston cylinder, thereby engaging the actuator; after the actuator is engaged, the first solenoid valve is in the closed state, so that the oil output by the high-pressure oil pump returns directly to the inlet of the high-pressure oil pump.

[0014] In the above-described hydraulic control system for the electric drive assembly, preferably, a check valve is provided in the oil circuit of the actuator.

[0015] In the hydraulic control system of the electric drive assembly described above, preferably, the second switching solenoid valve is a two-position three-way solenoid valve, and the third switching solenoid valve and the first switching solenoid valve are both two-position two-way solenoid valves.

[0016] This invention provides a hydraulic control system for an electric drive assembly, which can meet the lubrication needs of the actuators, motor, and gear pairs, as well as the operational needs of the actuators and parking actuators. High-pressure oil pumps are only required to supply pressurized oil to the first and second piston cylinders during the pressure build-up phase. During the pressure holding and depressurization phases, no pressurized oil is needed from the high-pressure oil pump. This satisfies the parking actuator's parking requirements when the vehicle is stationary. During driving, the output of the high-pressure oil pump is reduced, lowering the system's energy consumption. The electronic oil pump output... The hydraulic fluid is divided into high-pressure hydraulic fluid and low-pressure hydraulic fluid. High-pressure hydraulic fluid meets the operational requirements of the actuators and parking actuators, while low-pressure hydraulic fluid meets the cooling and lubrication requirements of the actuators, motors, and gear pairs. The control oil circuit formed by the electronic oil pump, the second solenoid valve, the third solenoid valve, the first solenoid valve, and the check valve, combined with the combined operation of the electronic oil pump, the second solenoid valve, the third solenoid valve, and the first solenoid valve, can realize the operation of the parking actuator and the operation of the actuators respectively. Moreover, during the holding phase of the parking actuator and the actuator, the high-pressure oil pump does not need to continuously supply oil, thus reducing the system energy consumption. Attached Figure Description

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram illustrating the control principle of an embodiment of the hydraulic control system for an electric drive assembly provided by the present invention.

[0019] Explanation of reference numerals in the attached diagram: 1-Oil pan, 2-Suction filter, 3-Electronic oil pump, 4-Cooler, 5-Pressure filter, 6-Second solenoid valve, 7-First piston cylinder, 8-Check valve, 9-Third solenoid valve, 10-Low-pressure oil circuit, 11-First solenoid valve, 12-Second piston cylinder, 13-Actuator, 14-Parking actuator, 15-Motor, 16-Gear pair, 20-High-pressure oil circuit, 101-Actuator lubrication branch, 102-Motor lubrication branch, 103-Gear shaft lubrication branch, 201-Parking actuator oil circuit, 202-Actuator oil circuit, 301-Oil pump motor, 302-Low-pressure oil pump, 303-High-pressure oil pump. Detailed Implementation

[0020] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0021] The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as “including” or “contains” mean that the element preceding the term encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as “above” and “below” are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0022] In this disclosure, when a specific component is described as being located between a first component and a second component, an intermediary component may or may not be present between the specific component and the first or second component. When a specific component is described as connecting to other components, the specific component may be directly connected to the other components without having an intermediary component, or it may not be directly connected to the other components but may have an intermediary component.

[0023] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0024] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0025] like Figure 1 As shown, this embodiment of the invention provides a hydraulic control system for an electric drive assembly, comprising: an oil pan 1; an electronic oil pump 3 connected to the oil pan 1; the electronic oil pump 3 being connected to a cooler 4 and a pressure filter 5; the cooler 4 being connected to an actuator lubrication branch 101, a motor lubrication branch 102, and a gear shaft lubrication branch 103; the actuator lubrication branch 101 being connected to an actuator 13; the motor lubrication branch 102 being connected to a motor 15; and the gear shaft lubrication branch 103 being connected to a gear pair 16; the pressure filter 5 being connected to a first switching solenoid valve 11 and a second... The second solenoid valve 6 is connected to the first piston cylinder 7, the second piston cylinder 12 and the third solenoid valve 9 respectively. The second solenoid valve 6 is connected to the first piston cylinder 7 through the parking actuator oil circuit 201. The second solenoid valve 6 is connected to the second piston cylinder 12 and the third solenoid valve 9 through the actuator oil circuit respectively. The first piston cylinder 7 is connected to the parking actuator 14. The second piston cylinder 12 is connected to the actuator 13. The third solenoid valve 9 and the first solenoid valve 11 are connected to the electronic oil pump 3 respectively.

[0026] Specifically, the actuator 13, the motor 15, and the gear pair 16 are lubricated through the actuator lubrication branch 101, the motor lubrication branch 102, and the gear shaft lubrication branch 103, respectively.

[0027] Furthermore, the second switching solenoid valve 6 is a two-position three-way solenoid valve, and the third switching solenoid valve 9 and the first switching solenoid valve 11 are both two-position two-way solenoid valves.

[0028] Furthermore, the electronic oil pump 3 includes an oil pump motor 301, a low-pressure oil pump 302, and a high-pressure oil pump 303.

[0029] Specifically, the inlet of the low-pressure oil pump 302 is connected to the oil pan 1, and a suction filter 2 is provided between the oil pan 1 and the low-pressure oil pump 302. The low-pressure oil pump 302 is connected to the cooler 4 through the low-pressure oil passage 10, and the cooler 4 is connected to the actuator lubrication branch 101, the motor lubrication branch 102 and the gear shaft lubrication branch 103 through the low-pressure oil passage 10.

[0030] Furthermore, the inlet of the high-pressure oil pump 303 is connected to the oil pan 1, the high-pressure oil pump 303 is connected to the pressure filter 5 through the high-pressure oil circuit 20, the pressure filter 5 is connected to the first switching solenoid valve 11 and the second switching solenoid valve 6 through the high-pressure oil circuit 20 respectively, and the third switching solenoid valve 9 and the first switching solenoid valve 11 are connected to the high-pressure oil pump 303 respectively.

[0031] Furthermore, the second switching solenoid valve 6 is connected to the inlet of the second piston cylinder 12 and the third switching solenoid valve 9 via the actuator oil passage 202, and the outlets of the third switching solenoid valve 9 and the first switching solenoid valve 11 are connected to the inlet of the high-pressure oil pump 303.

[0032] Furthermore, when the parking actuator 14 performs the parking function, the first solenoid valve 11 is in the open state, so that the inlet and outlet are not connected. The second solenoid valve 6 is in the second position, so that the inlet of the second solenoid valve 6 is connected to the oil circuit 201 of the parking actuator. The electronic oil pump 3 is in the start state, so as to provide pressurized oil to the first piston cylinder 7, pushing the piston rod to move to the left, so that the parking actuator performs the parking function. During the process of maintaining the parking function, the second solenoid valve 6 is in the first position, and the electronic oil pump 3 and the third solenoid valve 9 are in the closed state, so that the oil circuit 201 of the parking actuator continues to maintain pressure and continues to maintain the parking function.

[0033] Furthermore, when the parking actuator 14 disengages from the parking function, the second solenoid valve 6 is in the second position, so that the pressure oil in the parking actuator oil circuit 201 returns to the inlet of the high-pressure oil pump 303 along the second solenoid valve 6 and the third solenoid valve 9. Under the action of the spring, the piston rod moves to the right, so that the parking actuator disengages from the parking function.

[0034] Furthermore, when the actuator 13 performs its action, the second solenoid valve 6 is in the second position, so that the inlet of the second solenoid valve 6 is connected to the actuator oil circuit 202. The third solenoid valve 9 and the first solenoid valve 11 are in the open state, so that the inlet and outlet of the third solenoid valve 9 and the first solenoid valve 11 are not connected. The electronic oil pump 3 is in the start state, so as to supply pressurized oil to the second piston cylinder 12, so that the actuator engages. After the actuator engages, the first solenoid valve 11 is in the closed state, so that the oil output by the high-pressure oil pump 303 returns directly to the inlet of the high-pressure oil pump 303. In this invention, when the parking actuator 14 performs the parking function and the actuator 13 performs the action, the first switch solenoid valve 11 is in the normally open state. On the one hand, when the parking actuator oil circuit 201 does not require pressurized oil and the actuator oil circuit 202 does not require pressurized oil, the oil output by the high-pressure oil pump 303 can be unloaded, preventing the electronic oil pump 3 from being overloaded and ensuring the safety of the electronic oil pump 3. On the other hand, it can also reduce the energy consumption of the system.

[0035] Furthermore, a check valve 8 is provided in the actuator oil circuit 202 to prevent unloading of pressurized oil when the electronic oil pump 3 is not supplying oil to the actuator oil circuit 202.

[0036] During operation, when the parking actuator 14 needs to be parked, firstly, the first solenoid valve 11 is opened to disconnect the inlet and outlet. Then, the second solenoid valve 6 is switched to the second position, connecting its inlet to the parking actuator's oil circuit 201. Next, the electronic oil pump 3 is started, supplying pressurized oil to the first piston cylinder 7, pushing the piston rod to the left, thus enabling the parking actuator 14 to park. Then, the second solenoid valve 6 is switched back to the first position, closing the electronic oil pump 3 and the third solenoid valve 9. The parking actuator's oil circuit 201 can still maintain pressure, continuing to maintain the parking function.

[0037] When the parking actuator 14 needs to release the parking position, it is only necessary to switch the second solenoid valve 6 to the second position. The pressure oil in the parking actuator oil circuit 201 returns to the inlet of the high-pressure oil pump 303 along the second solenoid valve 6 and the third solenoid valve 9. The piston rod moves to the right under the action of the spring, and the parking actuator 14 can realize the function of releasing the parking position.

[0038] When actuator 13 needs to operate, the second solenoid valve 6 switches to the second position, connecting its inlet to the actuator oil circuit 202. The third solenoid valve 9 and the first solenoid valve 11 are then opened, disconnecting their inlets and outlets. The electronic oil pump 3 is then started, supplying pressurized oil to the second piston cylinder 12, thus engaging actuator 13. After actuator 13 is engaged, the first solenoid valve 11 is closed, returning the oil output from the high-pressure oil pump 303 directly to its inlet, reducing the load on the oil pump motor 301.

[0039] When the actuator 13 needs to be disengaged, simply close the third switch solenoid valve 9 to unload the pressure oil in the second piston cylinder 12, and the actuator 13 will be disengaged under the action of the spring force.

[0040] Therefore, it can be seen that the present invention only requires the high-pressure oil pump 303 to supply pressurized oil to the first piston cylinder 7 and the second piston cylinder 12 during the pressure establishment stage. During the pressure holding and depressurization stages of the first piston cylinder 7 and the second piston cylinder 12, the high-pressure oil pump 303 is not required to supply pressurized oil. This satisfies the parking requirements of the parking actuator 14 when the vehicle is parked. During driving, reducing the output of the high-pressure oil pump 303 reduces the energy consumption loss of the system.

[0041] The hydraulic control system for the electric drive assembly provided in this invention can meet the lubrication requirements of the actuators, motors, and gear pairs, as well as the operational requirements of the actuators and parking actuators. Only during the pressure build-up phase of the first and second piston cylinders does the high-pressure oil pump supply pressurized oil. During the pressure holding and depressurization phases of the first and second piston cylinders, the high-pressure oil pump is not required. This satisfies the parking actuator's parking requirements when the vehicle is stationary. During driving, the output of the high-pressure oil pump is reduced, lowering the system's energy consumption. The electronic oil pump output... The system uses high-pressure and low-pressure oil. High-pressure oil meets the operational requirements of the actuators and parking actuators, while low-pressure oil meets the cooling and lubrication requirements of the actuators, motors, and gear pairs. The control oil circuit, formed by the electronic oil pump, second solenoid valve, third solenoid valve, first solenoid valve, and check valve, combined with the combined actions of the electronic oil pump, second solenoid valve, third solenoid valve, and first solenoid valve, can realize the operation of the parking actuator and the actuator respectively. Furthermore, during the holding phase of the parking actuator and the actuator, the high-pressure oil pump does not need to continuously supply oil, thus reducing system energy consumption.

[0042] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0043] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A hydraulic control system for an electric drive assembly, characterized in that, include: An oil pan is connected to an electronic oil pump, which is connected to a cooler and a pressure filter. The cooler is connected to a lubrication branch for the actuator, a lubrication branch for the motor, and a lubrication branch for the gear shaft. The lubrication branch for the actuator is connected to the actuator, the lubrication branch for the motor is connected to the motor, and the lubrication branch for the gear shaft is connected to the gear pair. The pressure filter is connected to a first solenoid valve and a second solenoid valve. The second solenoid valve is connected to a first piston cylinder, a second piston cylinder, and a third solenoid valve. The second solenoid valve is connected to the first piston cylinder via a parking actuator oil circuit. The second solenoid valve is connected to the second piston cylinder and the third solenoid valve via an actuator oil circuit. The first piston cylinder is connected to the parking actuator, the second piston cylinder is connected to the actuator, and the third solenoid valve and the first solenoid valve are connected to the electronic oil pump. When the parking actuator performs the parking function, the first solenoid valve is in the open state, so that the inlet and outlet are not connected. The second solenoid valve is in the second position, so that the inlet of the second solenoid valve is connected to the oil circuit of the parking actuator. The electronic oil pump is in the start state, so as to provide pressurized oil to the first piston cylinder, pushing the piston rod to move to the left, so that the parking actuator performs the parking function. During the process of maintaining the parking function, the second solenoid valve is in the first position, and the electronic oil pump and the third solenoid valve are in the closed state, so that the oil circuit of the parking actuator continues to maintain pressure and continues to maintain the parking function. When the parking actuator disengages from the parking function, the second solenoid valve is in the second position, so that the pressure oil in the parking actuator oil circuit returns to the inlet of the high-pressure oil pump along the second solenoid valve and the third solenoid valve. The piston rod moves to the right under the action of the spring, so that the parking actuator disengages from the parking function. The electronic oil pump includes an oil pump motor, a low-pressure oil pump, and a high-pressure oil pump; The inlet of the high-pressure oil pump is connected to the oil pan. The high-pressure oil pump is connected to the pressure filter through a high-pressure oil circuit. The pressure filter is connected to the first solenoid valve and the second solenoid valve through the high-pressure oil circuit. The third solenoid valve and the first solenoid valve are connected to the high-pressure oil pump.

2. The hydraulic control system for the electric drive assembly according to claim 1, characterized in that, The inlet of the low-pressure oil pump is connected to the oil pan, and a suction filter is provided between the oil pan and the low-pressure oil pump. The low-pressure oil pump is connected to the cooler through a low-pressure oil circuit, and the cooler is connected to the actuator lubrication branch, the motor lubrication branch, and the gear shaft lubrication branch through the low-pressure oil circuit.

3. The hydraulic control system for the electric drive assembly according to claim 2, characterized in that, The second solenoid valve is connected to the inlet of the second piston cylinder and the third solenoid valve via an actuator oil circuit, and the outlets of the third solenoid valve and the first solenoid valve are connected to the inlet of the high-pressure oil pump.

4. The hydraulic control system for the electric drive assembly according to claim 1, characterized in that, When the actuator performs its action, the second solenoid valve is in the second position, so that the inlet of the second solenoid valve is connected to the oil circuit of the actuator. The third solenoid valve and the first solenoid valve are in the open state, so that the inlet and outlet of the third solenoid valve and the first solenoid valve are not connected. The electronic oil pump is in the start state, so as to supply pressurized oil to the second piston cylinder, thereby engaging the actuator. After the actuator is engaged, the first solenoid valve is in the closed state, so that the oil output by the high-pressure oil pump returns directly to the inlet of the high-pressure oil pump.

5. The hydraulic control system for the electric drive assembly according to claim 1, characterized in that, A one-way valve is installed in the oil circuit of the actuator.

6. The hydraulic control system for the electric drive assembly according to claim 1, characterized in that, The second solenoid valve is a two-position three-way solenoid valve, and the third solenoid valve and the first solenoid valve are both two-position two-way solenoid valves.

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