Hybrid power box hydraulic control system and vehicle

Abstract

The utility model relates to a hydraulic control system for a hybrid power box and a vehicle, and the hydraulic control system comprises a hydraulic oil way which comprises a main oil way and a working oil way, and the working oil way comprises a low-pressure oil way and a high-pressure oil way; the oil supply module is connected with the main oil way; the pressure switch valve is arranged on the high-pressure oil way and is used for controlling the on-off of the high-pressure oil way; the oil way switching valve is arranged among the main oil way, the low-pressure oil way and the high-pressure oil way and used for switching the communication state of the main oil way and the low-pressure oil way or the high-pressure oil way; the feedback cavity communicates with the high-pressure oil way through a feedback oil way, and the feedback oil way is located between the pressure switch valve and the oil way switching valve. According to the scheme, a traditional double-pump design is abandoned, high-low pressure automatic switching under driving of a single oil supply module is achieved, hardware is reduced, and cost is reduced; the feedback cavity of the oil way switching valve and the high-pressure oil way form linkage design through the feedback oil way, automatic switching of the oil flow direction can be achieved, external control signal intervention is not needed, control logic is simplified, and reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the automobile technical field, in particular to a hybrid box hydraulic control system and vehicle. BACKGROUND

[0002] Hybrid electric vehicles are increasingly chosen by people due to their energy-saving and emission-reducing characteristics on the basis of ensuring endurance.

[0003] In order to ensure the normal use of the hybrid transmission, it is often necessary to forcibly cool or lubricate the components to be lubricated and cooled (such as overheated motors or shaft tooth components) in the hybrid transmission through the hydraulic system, and it is also necessary to drive the high-pressure driving components (such as clutches, parking structures, etc.).

[0004] At present, two pumps (mechanical pumps plus electronic pumps) are usually required for the hydraulic system to complete the high oil pressure establishment and cooling and lubrication operation, which is high in cost and difficult to arrange; and the oil way switching valve of the single pump hydraulic system usually needs to be matched with sensors, electromagnetic control, etc. to realize reversing, and the control logic is relatively complex. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a hybrid box hydraulic control system and vehicle to solve the problems of complex structure, high cost, difficult arrangement and complex control of the existing hydraulic control system.

[0006] On the one hand, the utility model provides a hybrid box hydraulic control system, comprising:

[0007] A hydraulic oil way, comprising a main oil way and a working oil way, wherein the working oil way comprises a low-pressure oil way and a high-pressure oil way;

[0008] An oil supply module connected with the main oil way, used for supplying oil to the main oil way;

[0009] A pressure switch valve arranged on the high-pressure oil way, used for controlling the on-off of the high-pressure oil way;

[0010] An oil way switching valve arranged between the main oil way and the low-pressure oil way and the high-pressure oil way, used for switching the communication state of the main oil way and the low-pressure oil way or the high-pressure oil way according to the oil pressure change of its feedback cavity;

[0011] The feedback cavity is communicated to the high-pressure oil way through a feedback oil way, and one end of the feedback oil way connected to the high-pressure oil way is located between the pressure switch valve and the oil way switching valve.

[0012] In one of the embodiments, the oil path switching valve has an input end, a first output end and a second output end, the input end is connected with the main oil path, the first output end is connected with the high-pressure oil path, and the second output end is connected with the low-pressure oil path;

[0013] The working states of the oil path switching valve include:

[0014] The first working state: the input end is communicated with the first output end to supply oil to the high-pressure oil path;

[0015] The second working state: the input end is communicated with the second output end to supply oil to the low-pressure oil path;

[0016] The trigger condition of the working state switching is that the oil pressure of the feedback cavity reaches a preset critical value.

[0017] In one of the embodiments, the preset critical value is set by an elastic reset member, and the elastic reset member acts on the valve core of the oil path switching valve.

[0018] The action direction of the elastic reset member on the valve core is opposite to the action direction of the oil pressure of the feedback cavity.

[0019] In one of the embodiments, the oil supply module includes an oil pump arranged on the main oil path and an oil pump motor driving the oil pump.

[0020] The oil pump motor is internally provided with a cooling and lubricating flow channel, and the cooling and lubricating flow channel is communicated with the main oil path.

[0021] In one of the embodiments, a one-way valve is arranged on the main oil path, the one-way valve is located between the oil suction port of the main oil path and the oil pump, and is opened in one direction from the oil suction port to the oil pump.

[0022] In one of the embodiments, the high-pressure oil path includes a first gear control oil path and a second gear control oil path downstream of the pressure switch valve.

[0023] A gear selection valve is arranged on the high-pressure oil path to control the on-off of the first gear control oil path and the second gear control oil path.

[0024] In one of the embodiments, the low-pressure oil path includes a gear shaft lubricating oil path and a motor cooling oil path arranged in parallel; wherein,

[0025] A fine filter is arranged on the gear shaft lubricating oil path.

[0026] The motor cooling oil circuit is provided with a flow switching valve, the flow switching valve includes an oil inlet end and two oil outlet ends, the oil inlet end is connected to the second output end, and the two oil outlet ends are respectively connected with a first cooling flow channel and a second cooling flow channel; the flow switching valve is used for controlling the oil inlet end to communicate with the first cooling flow channel and / or the second cooling flow channel.

[0027] In one of the embodiments, the low-pressure oil circuit is provided with a thermostat and an oil cooler;

[0028] The thermostat has an oil inlet and two oil outlets, the oil inlet communicates with the second output end, and the two oil outlets are respectively connected with a normal-temperature oil circuit and a cooling oil circuit, and the oil cooler is arranged on the cooling oil circuit;

[0029] The normal-temperature oil circuit and the cooling oil circuit are both connected to the pinion shaft lubricating oil circuit and the motor cooling oil circuit;

[0030] The thermostat is used for controlling the oil inlet to communicate with the normal-temperature oil circuit and / or the cooling oil circuit according to the temperature of the hydraulic oil.

[0031] In one of the embodiments, the hybrid box hydraulic control system further includes a valve body;

[0032] The hydraulic oil circuit, the oil supply module, the pressure switch valve and the oil circuit switching valve are all integrally arranged in the valve body.

[0033] On the other hand, the utility model also provides a vehicle, it includes the hybrid box hydraulic control system of any embodiment above.

[0034] Compared with the prior art, the utility model has at least the following beneficial effects:

[0035] The hybrid box hydraulic control system discards the traditional double-pump design, realizes high-low pressure automatic switching under the driving of a single oil supply module, reduces hardware, simplifies the oil circuit and reduces cost; the feedback cavity of the oil circuit switching valve and the high-pressure oil circuit are linked through the feedback oil circuit, so that after gear shifting is completed, the oil pressure of the feedback cavity can directly trigger the oil circuit switching valve to change direction, realizing automatic switching of the oil flow direction without external control signal intervention, simplifying control logic and reducing vehicle ECU computing load; moreover, high-low pressure switching depends on oil pressure feedback instead of electrical signals, avoiding misoperation caused by electromagnetic interference and improving reliability. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a flow path schematic view of the hybrid box hydraulic control system in one embodiment;

[0037] Figure 2 It is a structural schematic view of the oil circuit switching valve in one embodiment;

[0038] Figure 3 is a side view of the hydraulic control system of the hybrid gearbox in an embodiment;

[0039] Figure 4 is a structural schematic view of the upper valve body and the lower valve body in an embodiment;

[0040] Figure 5 is a top view of the hydraulic control system of the hybrid gearbox in an embodiment;

[0041] Figure 6 is a bottom view of the hydraulic control system of the hybrid gearbox in an embodiment;

[0042] Figure 7 is a transverse sectional view of the upper valve body in an embodiment;

[0043] Figure 8 is a longitudinal sectional view of the oil supply module in an embodiment.

[0044] The reference signs in the drawings of the specification include: main oil circuit 1, oil suction port 2, check valve 3, oil supply module 4, oil pump motor 401, cover plate 4011, cooling and lubricating flow channel 4012, oil pump 402, oil circuit switching valve 5, feedback cavity 501, elastic reset member 502, high-pressure oil circuit 6, low-pressure oil circuit 7, feedback oil circuit 8, pressure switch valve 9, first-gear control oil circuit 10, first-gear control oil port 101, second-gear control oil circuit 11, second-gear control oil port 111, gear selection valve 12, gear shift piston 13, thermostat 14, normal-temperature oil circuit 15, temperature-reducing oil circuit 16, oil cooler 17, motor cooling oil circuit 18, flow switching valve 19, first cooling flow channel 20, first cooling port 201, second cooling flow channel 21, second cooling port 211, gear shaft lubricating oil circuit 22, gear shaft lubricating oil outlet port 221, fine filter 23, valve body 24, upper valve body 241, intermediate sealing plate 242, lower valve body 243. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0046] It should be noted that the diagrams provided in the embodiments only schematically illustrate the basic concept of the present application.

[0047] The structure, proportion, size and the like shown in the drawings of the specification are only used to cooperate with the disclosed content, to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the utility model. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the functions and purposes that can be achieved by the utility model, should still fall within the scope of the disclosed technology.

[0048] The orientation or positional relationship referred to in the specification, such as "upper", "lower", "left", "right", "middle", "vertical", "horizontal", "horizontal", "inner", "outer", "radial", "circumferential" and the like, is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the utility model. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0049] As described in the background, two pumps (mechanical pump plus electronic pump) are usually required for the hydraulic system to complete the high oil pressure establishment and cooling lubrication operation, which is high in cost and difficult to arrange; and the oil path switching valve of the single pump hydraulic system usually needs to be matched with sensors, electromagnetic control and the like to realize reversing, and the control logic is relatively complex.

[0050] In view of this, the utility model embodiment provides a hybrid box hydraulic control system, which comprises:

[0051] The hydraulic oil path comprises a main oil path 1 and a working oil path, and the working oil path comprises a low-pressure oil path 7 and a high-pressure oil path 6;

[0052] The oil supply module 4 is connected with the main oil path 1 and is used for supplying oil to the main oil path 1;

[0053] The pressure switch valve 9 is arranged on the high-pressure oil path 6 and is used for controlling the on-off of the high-pressure oil path 6;

[0054] The oil path switching valve 5 is arranged between the main oil path 1 and the low-pressure oil path 7 and the high-pressure oil path 6, and is used for switching the communication state of the main oil path 1 with the low-pressure oil path 7 or the high-pressure oil path 6 according to the oil pressure change of the feedback cavity 501;

[0055] The feedback cavity 501 is communicated to the high-pressure oil path 6 through the feedback oil path 8, and one end of the feedback oil path 8 connected to the high-pressure oil path 6 is located between the pressure switch valve 9 and the oil path switching valve 5.

[0056] The hybrid box hydraulic control system provided in the above embodiment has the following principle:

[0057] Initial state: the oil way switching valve 5 controls the high pressure oil way 6 to keep in communication with the main oil way 1, and the pressure switch valve 9 controls the high pressure oil way 6 to be blocked.

[0058] Low pressure oil supply mode: the oil supply module 4 supplies pressure oil to the main oil way 1, the pressure oil enters the high pressure oil way 6 through the oil way switching valve 5, the high pressure oil way 6 is blocked by the pressure switch valve 9, and the feedback oil way 8 connects the feedback cavity 501 and the pipe section of the high pressure oil way 6 between the pressure switch valve 9 and the oil way switching valve 5, so that the pressure oil entering the high pressure oil way 6 flows into the feedback cavity 501 of the oil way switching valve 5 through the feedback oil way 8, when the oil pressure of the feedback cavity 501 reaches a specified value, the oil way switching valve 5 is triggered to switch, so that the main oil way 1 and the high pressure oil way 6 are disconnected and connected with the low pressure oil way 7, the pressure oil of the main oil way 1 flows to the low pressure oil way 7, and low pressure operation, such as lubrication and / or cooling operation of the motor, the gear shaft and the like, is performed, during which, the part of the high pressure oil way 6, the feedback oil way 8 and the feedback cavity 501 keeps in a closed state, the pressure of the feedback cavity 501 can be maintained, and the oil way switching valve 5 keeps in a state of connecting the main oil way 1 and the low pressure oil way 7.

[0059] High pressure oil supply mode: the pressure switch valve 9 controls the high pressure oil way 6 to be conducted, so that the feedback oil way 8 and the feedback cavity 501 are connected with the downstream section of the high pressure oil way 6, due to the increase of the oil cavity volume, the oil pressure of the feedback cavity 501 of the oil way switching valve 5 is reduced, so as to trigger the oil way switching valve 5 to switch, so that the main oil way 1 and the low pressure oil way 7 are disconnected and connected with the high pressure oil way 6, the pressure oil enters the high pressure oil way 6, and high pressure operation, such as driving the gear shifting mechanism to shift gears, is performed, during which, the oil pressure of the feedback cavity 501 is equal to the oil pressure of the high pressure oil way 6 due to the connection, when the gear shifting is completed, the oil pressure of the feedback cavity 501 just triggers the oil way switching valve 5 to switch, so that the main oil way 1 and the high pressure oil way 6 are disconnected and connected with the low pressure oil way 7, and the oil continues to flow to the low pressure oil way 7 to perform the cooling and lubrication operation.

[0060] The hydraulic control system of the hybrid gearbox discards the traditional double pump design, realizes automatic switching of high and low pressure under the driving of the single oil supply module 4, reduces hardware and simplifies oil way, and reduces cost; the feedback oil way 8 is used to link the feedback cavity 501 of the oil way switching valve 5 and the high pressure oil way 6, so that the oil way switching valve 5 can be directly triggered to switch through the oil pressure of the feedback cavity 501 after the gear shifting is completed, the automatic switching of the oil flow is realized, external control signal intervention is not needed, the control logic is simplified, and the ECU calculation load of the vehicle is reduced; moreover, the switching of high and low pressure depends on oil pressure feedback instead of electric signal, the misoperation caused by electromagnetic interference is avoided, and the reliability is improved.

[0061] The hydraulic control system of the hybrid gearbox provided by the embodiment of the utility model will be described in detail below with reference to the drawings.

[0062] According to Figure 1The hydraulic control system of the hybrid gearbox according to at least one embodiment of the utility model is shown in the example, and the hydraulic control system of the hybrid gearbox comprises: a hydraulic oil circuit, an oil supply module 4, a pressure switch valve 9 and an oil circuit switching valve 5.

[0063] The hydraulic oil circuit is a flow channel of the hydraulic oil, and is used for directing the hydraulic oil to be delivered to a designated execution component, such as a shift mechanism, a motor cooling oil channel, a gear shaft lubricating oil channel and the like, so as to respond to a corresponding operation requirement.

[0064] Specifically, referring to Figure 1 In the embodiment, the hydraulic oil circuit comprises a main oil circuit 1, and the main oil circuit 1 is an oil inlet circuit of the hydraulic control system, and has a suction port 2, which is usually connected with a hydraulic oil tank of a vehicle. By connecting the oil supply module 4 to the main oil circuit 1, the oil supply module 4 can suck the hydraulic oil from the suction port 2 into the main oil circuit 1 in use, so as to supply the system with oil.

[0065] Referring to Figure 1 In the embodiment, the oil supply module 4 specifically comprises an oil pump 402 and an oil pump motor 401 for driving the oil pump 402, and the oil pump 402 is arranged on the main oil circuit 1. In use, the oil pump 402 can be driven to operate by the oil pump motor 401, so as to perform the oil pumping operation and pump the hydraulic oil into the main oil circuit 1, thereby providing the system with the hydraulic oil.

[0066] Further, in the embodiment, the oil pump motor 401 is a motor independent of a vehicle driving system. In this way, compared with the prior art in which an engine or a driving motor is used as a power source of the oil pump 402, the present scheme can make the driving of the oil pump 402 no longer dependent on the engine or the driving motor, decouple the gear control and the cooling and lubricating control of the vehicle from the working state of the engine or the driving motor, and complete the gear switching, pre-lubrication and the like when the vehicle is not started, thereby optimizing the operation of the hydraulic control system, and also facilitating the direct integration of the oil pump motor 401 with the system, and optimizing the design layout of the system.

[0067] Further, referring to Figure 1 and Figure 7In the embodiment, the oil pump motor 401 is internally provided with a cooling and lubricating flow channel 4012, which is in communication with the main oil circuit 1. In this way, the cooling and lubricating flow channel 4012 of the oil pump motor 401 is communicated with the main oil circuit 1, so that when the system is running, the main oil circuit 1 can deliver part of the hydraulic oil to the cooling and lubricating flow channel 4012 of the oil pump motor 401 to provide cooling and lubrication for the rotor, stator and other components of the oil pump motor 401, reduce the temperature rise of the oil pump motor 401, reduce the power consumption requirement of the oil pump motor 401, prolong the service life and high-power working time of the oil pump motor 401, and realize internal circulation of the cooling oil; while meeting the cooling and lubrication of the oil pump motor 401, the external cooling components can be removed to realize compact structure design of the system.

[0068] Referring to Figure 1 In some embodiments, the main oil circuit 1 is further provided with a one-way valve 3, which is located between the oil suction port 2 of the main oil circuit 1 and the oil pump 402, and the one-way valve 3 is opened in the direction from the oil suction port 2 to the oil pump 402. In this way, based on the non-return characteristic of the one-way valve 3, when the oil pump 402 is stopped, the oil in the system will not flow back to the hydraulic oil tank through the oil suction port 2, but will be stored in the rotor cavity of the oil pump 402, so that the entire oil pump 402 is in an oil bath environment in the stationary state, avoiding dry friction when the oil pump 402 starts next time, and improving the low-temperature starting performance of the oil pump 402; at the same time, oil can also be stored in each oil channel, and the next time the oil is started, the stored oil can quickly reach the target area, reducing the time for the oil to reach the target area, and improving the response speed of cooling and lubrication.

[0069] In the embodiment, the hydraulic oil circuit further includes a working oil circuit, which is used to connect various types of execution components to direct the hydraulic oil to the execution components to realize corresponding functions. For example, the working oil circuit can be connected to a shift mechanism to provide power for the shift mechanism; for another example, the working oil circuit can be connected to a cooling oil channel of a motor to provide cooling oil for the motor, etc.

[0070] Specifically, referring to Figure 1 In the embodiment, the working oil circuit includes a high-pressure oil circuit 6 and a low-pressure oil circuit 7, and the high-pressure oil circuit 6 and the low-pressure oil circuit 7 are arranged in parallel. Among them, the high-pressure oil circuit 6 is used to connect the execution components that need high-pressure oil, such as the shift mechanism, and the low-pressure oil circuit 7 is used to connect the execution components that need low-pressure oil, such as the cooling structure of the driving motor. In this way, the pressure can be supplied on demand to meet the different needs of different execution components.

[0071] For example, referring to Figure 1In a specific example, the high-pressure oil passage 6 is connected to a two-gear shift mechanism having a shift piston 13 with a first-gear oil port and a second-gear oil port. Correspondingly, the high-pressure oil passage 6 has two branch oil passages at the output end, i.e., a first-gear control oil passage 10 and a second-gear control oil passage 11, which are respectively connected to the two oil ports of the shift piston 13. In use, the shift piston 13 can be switched to the first gear by supplying oil to the first-gear oil port through the first-gear control oil passage 10, and switched to the second gear by supplying oil to the second-gear oil port through the second-gear control oil passage 11.

[0072] Referring to Figure 1 , to realize the switching of the shift mechanism, the first-gear control oil passage 10 and the second-gear control oil passage 11 are further provided with a gear selection valve 12, which is specifically a two-position four-way electromagnetic valve. By switching the gear selection valve 12, the first-gear control oil passage 10 or the second-gear control oil passage 11 can be supplied with oil. Specifically, referring to the structure of the gear selection valve 12 shown in Figure 1 , when the gear selection valve 12 is switched to the left position, the first-gear control oil passage 10 is in a conductive state and the second-gear control oil passage 11 is in a blocked state, so that the high-pressure oil can enter the first-gear oil port of the shift piston 13 through the first-gear control oil passage 10, while the second-gear oil port of the shift piston 13 is unloaded, allowing the shift mechanism to be switched to the first gear. When the gear selection valve 12 is switched to the right position, the second-gear control oil passage 11 is in a conductive state and the first-gear control oil passage 10 is in a blocked state, so that the high-pressure oil can enter the second-gear oil port of the shift piston 13 through the second-gear control oil passage 11, while the second-gear oil port of the shift piston 13 is unloaded, allowing the shift mechanism to be switched to the second gear.

[0073] In a specific example, the low-pressure oil passage 7 can be connected to a motor cooling flow channel and a pinion shaft lubrication flow channel. For example, referring to Figure 1 , the low-pressure oil passage 7 has two branch oil passages at the output end, i.e., a pinion shaft lubrication oil passage 22 and a motor cooling oil passage 18, which are arranged in parallel. The pinion shaft lubrication oil passage 22 can be connected to the pinion shaft lubrication flow channel to provide low-pressure lubricating oil for pinion shaft lubrication. The motor cooling oil passage 18 can be connected to the cooling flow channel of the motor to provide cooling liquid for motor cooling.

[0074] Further, referring to Figure 1 , the pinion shaft lubrication oil passage 22 is provided with a fine filter 23 to filter out small impurities in the hydraulic oil, ensuring that the components are supplied with clean lubricating oil, thereby prolonging the service life of the components.

[0075] Further, referring to Figure 1The motor cooling oil circuit 18 is also equipped with a flow switching valve 19, which is a three-position three-way solenoid valve. It includes an inlet end and two outlet ends. The inlet end is connected to the low-pressure oil circuit 7, and the two outlet ends are respectively connected to the first cooling channel 20 and the second cooling channel 21. The first cooling channel 20 is used to connect to the first motor, and the second cooling channel 21 is used to connect to the second motor. The flow switching valve 19 controls the connection between the inlet end and the first cooling channel 20 and / or the second cooling channel 21, allowing the motor cooling circuit to match the cooling of both motors. For example, when only the second motor is working, the flow switching valve 19 switches to the right position, and the cooling oil only goes to the second motor; when only the first motor is working, the flow switching valve 19 switches to the left position, and the cooling oil only goes to the first motor; when both the first and second motors are working simultaneously, the motor flow switching valve 19 switches to the middle position, and the cooling oil simultaneously cools both motors. Based on this, the cooling flow requirements of the two motors can be adjusted by switching the solenoid valve, thereby reducing the power consumption of the electronic oil pump 402.

[0076] Further, see Figure 1 A thermostat 14 and an oil cooler 17 are installed upstream of the two branch oil circuits in the low-pressure oil circuit 7. The thermostat 14 has one oil inlet and two oil outlets. The oil inlet is connected to the second output terminal of the oil circuit switching valve 5, and the two oil outlets are respectively connected to the normal temperature oil circuit 15 and the cooling oil circuit 16. The oil cooler 17 is installed on the cooling oil circuit 16, and the ends of both the normal temperature oil circuit 15 and the cooling oil circuit 16 are connected to the gear shaft lubrication oil circuit 22 and the motor cooling oil circuit 18. In this embodiment, the thermostat 14 can control whether the oil passes through the oil cooler 17 according to the oil temperature, that is, control the oil inlet to connect to the normal temperature oil circuit 15 and / or the cooling oil circuit 16, so as to ensure that the oil flowing to the gear shaft lubrication oil circuit 22 and the motor cooling oil circuit 18 is maintained within a suitable temperature range, reducing the oil load under low temperature conditions and improving efficiency.

[0077] Specifically, in this embodiment, the thermostat 14 can be a wax-type thermostat, based on Figure 1 As shown, when the oil temperature is low, the thermostat 14 is in the upper position and connected to the oil inlet and the normal temperature oil circuit 15. The oil does not pass through the oil cooler 17 and directly enters the gear shaft lubrication oil circuit 22 and the motor cooling oil circuit 18. When the oil temperature is high, the thermostat 14 is in a semi-melted state with the expanded wax pack. At this time, the thermostat 14 is in the middle position and connected to the oil inlet, the normal temperature oil circuit 15, and the cooling oil circuit 16. Some of the oil does not pass through the oil cooler 17, and some of the oil passes through the oil cooler 17. When the oil temperature is very high, the wax pack of the thermostat 14 is completely melted. At this time, the thermostat 14 is in the lower position and connected to the oil inlet and the cooling oil circuit 16. All the oil passes through the oil cooler 17.

[0078] See Figure 1In the embodiment, the oil path switching valve 5 is arranged between the main oil path 1 and the low-pressure oil path 7 and the high-pressure oil path 6, and is used to selectively connect the main oil path 1 to the high-pressure oil path 6 or the low-pressure oil path 7, so as to realize gear shifting oil supply or cooling lubrication oil supply.

[0079] Specifically, referring to Figure 1 In the embodiment, the oil path switching valve 5 is a two-position three-way valve, which has an input end, a first output end and a second output end. The input end is connected to the main oil path 1, the first output end is connected to the high-pressure oil path 6, and the second output end is connected to the low-pressure oil path 7. The working states of the oil path switching valve 5 include a first working state and a second working state. In the first working state, the right position of the oil path switching valve 5 is turned on, that is, the input end is connected to the first output end, so that the main oil path 1 can supply oil to the high-pressure oil path 6. In the second working state, the left position of the oil path switching valve 5 is turned on, that is, the input end is connected to the second output end, so that the main oil path 1 can supply oil to the low-pressure oil path 7.

[0080] Further, in the embodiment, the oil path switching valve 5 is a hydraulic control valve. Specifically, referring to Figure 2 and Figure 2 The oil path switching valve 5 has a feedback cavity 501 and an elastic reset member 502. The elastic reset member 502 can be a spring. The feedback cavity 501 and the elastic reset member 502 are respectively located at two ends of a spool of the oil path switching valve 5, and the action direction of the elastic reset member 502 on the spool is opposite to the oil pressure action direction of the feedback cavity 501. In operation, the oil path switching valve 5 switches the working state according to the oil pressure change of the feedback cavity 501, that is, the trigger condition for switching the working state of the oil path switching valve 5 is that the oil pressure of the feedback cavity 501 reaches a preset critical value. For example, referring to Figure 1 When the oil pressure of the feedback cavity 501 can overcome the elastic force of the elastic reset member 502, the spool of the oil path switching valve 5 is pushed to move leftward, so that the P port and the A port are turned on, that is, the input end is connected to the second output end, thereby realizing the switching of the working state. When the oil pressure of the feedback cavity 501 decreases, the elastic reset member 502 pushes the spool to move rightward for resetting, so that the P port and the B port are turned on, that is, the input end is connected to the first output end, thereby realizing the switching of the working state.

[0081] Further, referring to Figure 1 In the embodiment, the high-pressure oil path 6 is provided with a pressure switch valve 9, and the feedback cavity 501 of the oil path switching valve 5 is connected to the high-pressure oil path 6 through a feedback oil path 8. One end of the feedback oil path 8 connected to the high-pressure oil path 6 is located between the pressure switch valve 9 and the oil path switching valve 5.

[0082] The pressure switch valve 9 is used to control the on-off of the high-pressure oil path 6, so as to control the oil pressure change of the feedback oil path 8 and the feedback cavity 501, thereby triggering the oil path switching valve 5 to reverse. Specifically, referring to Figure 3In the embodiment, the pressure switch valve 9 can be a two-position two-way electromagnetic valve. When the pressure switch valve 9 is switched to the left position, the high-pressure oil way 6 is turned on, and when the pressure switch valve 9 is switched to the right position, the high-pressure oil way 6 is blocked.

[0083] Based on the above structure design, when the pressure switch valve 9 is switched to the right position to block the high-pressure oil way 6, the hydraulic oil delivered to the high-pressure oil way 6 flows in the direction of the feedback oil way 8 and the feedback cavity 501. When the oil pressure of the feedback cavity 501 reaches a critical value, the valve core of the oil way switching valve 5 is triggered to act, realizing the reversing. At this time, the communication part of the high-pressure oil way 6, the feedback oil way 8 and the feedback cavity 501 is in a pressure maintaining state, ensuring that the working state of the oil way switching valve 5 is maintained in the second working state, and continuously providing the cooling lubricating oil for the low-pressure oil way 7.

[0084] When shifting is needed, the pressure switch valve 9 is switched to the left position to turn on the high-pressure oil way 6, so that the feedback oil way 8 and the feedback cavity 501 are communicated with the downstream section of the high-pressure oil way 6. Due to the increase of the oil cavity volume, the oil pressure of the feedback cavity 501 of the oil way switching valve 5 is reduced, thereby triggering the oil way switching valve 5 to act for reversing, so that the main oil way 1 and the low-pressure oil way 7 are disconnected and communicated with the high-pressure oil way 6. The pressure oil enters the high-pressure oil way 6 to drive the shift piston 13 to perform the shifting operation.

[0085] In addition, the trigger oil pressure of the shift piston 13 can also be set to be the same as the trigger oil pressure of the oil way switching valve 5, so that when the shifting is completed, the oil pressure of the feedback cavity 501 also triggers the oil way switching valve 5 to reverse, so that the main oil way 1 and the high-pressure oil way 6 are disconnected and communicated with the low-pressure oil way 7, and the oil liquid goes to the low-pressure oil way 7 to perform the cooling lubrication operation. Moreover, when the shifting mechanism needs to be switched to neutral, the pressure switch valve 9 is switched to the right position, so that the shift piston 13 is unloaded. In this process, the feedback cavity 501 and the feedback oil way 8 can still be in a pressure maintaining state, so that the oil way switching valve 5 remains in the second working state to continuously supply oil to the low-pressure oil way 7, and no change will be caused by the switching of the pressure switch valve 9.

[0086] Based on the above, the pressure switch valve 9 is used to realize the pressure maintaining and pressure releasing of the feedback oil way 8 in the embodiment, so that the feedback oil way 8 links the feedback cavity 501 of the oil way switching valve 5 with the high-pressure oil way 6, so that after the shifting is completed, the oil pressure of the feedback cavity 501 can directly trigger the oil way switching valve 5 to reverse, realizing the automatic switching of the oil liquid flow direction without external control signal intervention, simplifying the control logic and reducing the vehicle ECU computing load. Moreover, the high-low pressure switching depends on the oil pressure feedback instead of the electric signal, avoiding the misoperation caused by electromagnetic interference and improving the reliability.

[0087] And, the oil way switching valve 5 only switches during the gear selection process, and since the gear selection process is very short, usually <1s, the gear selection process does not affect the cooling and lubricating system, and the oil pump 402 only maintains high pressure during the short gear selection process, so that the oil pump motor 401 works at peak power during the short gear selection process, and the rest works at rated power to supply oil to the cooling and lubricating system, which can reduce the rated power requirement of the electronic oil pump 402, and since the high pressure working time is very short, the efficiency is high, and a single pump can also achieve good high and low pressure switching effect.

[0088] Further, in the embodiment, the hybrid gearbox hydraulic control system further comprises a valve body 24, and the foregoing components are integrally arranged on the valve body 24, so that the system forms a modular structure, and such arrangement can realize compact structure and light weight, optimize the hybrid gearbox assembly process, reduce the difficulty of hybrid gearbox assembly design and layout, and improve the maintainability of the product.

[0089] Specifically, referring to Figure 4 , the valve body 24 comprises an upper valve body 241, an intermediate sealing plate 242 and a lower valve body 243 arranged in sequence from top to bottom. The hydraulic oil way, control valve and oil supply module 4 in the hydraulic control system are all integrated in the interior of the upper valve body 241 and / or the lower valve body 243.

[0090] For example, referring to Figure 4 , the main oil way 1, the low pressure oil way 7, the high pressure oil way 6 and the feedback oil way 8 in the hydraulic oil way can all be formed by oil channels arranged in the interior of the upper valve body 241 and / or the lower valve body 243.

[0091] Correspondingly, referring to Figure 6 and Figure 4 , the lower valve body 243 is provided with the oil suction port 2 corresponding to the main oil way 1, the one-gear control oil port 101 and the two-gear control oil port 111 corresponding to the one-gear control oil way 10 and the two-gear control oil way 11, the first cooling port 201 and the second cooling port 211 corresponding to the first cooling flow channel 20 and the second cooling flow channel 21, and the gear shaft lubrication oil outlet port 221 corresponding to the gear shaft lubrication oil way 22. When assembled, the oil suction port 2 is connected with the hydraulic oil tank of the vehicle, so that the system can be supplied with oil; the one-gear control oil port 101 and the two-gear control oil port 111 are connected with the one-gear oil port and the two-gear oil port of the gear shifting piston 13 respectively, so that the gear shifting mechanism can be supplied with oil; the first cooling port 201 and the second cooling port 211 are connected with the cooling flow channels of the two motors respectively, so that the motors can be supplied with cooling liquid; and the gear shaft lubrication oil outlet port 221 is connected with the gear shaft lubrication flow channel, so that the gear shaft can be supplied with lubricating oil. Such arrangement integrates the oil ways in the interior of the valve body 24, and compared with complicated hydraulic pipeline arrangement, the structure is more compact, and the arrangement difficulty is reduced.

[0092] In the embodiment, the spools of the control valves such as the oil path switching valve 5, the gear selection valve 12, the pressure switching valve 9 and the flow switching valve 19 are all arranged in the upper valve body 241, and together with the valve cavities arranged in the upper valve body 241, form the valve structure.

[0093] For example, referring to Figure 7 and Figure 8 , the inside of the upper valve body 241 is provided with a plurality of valve cavities matched with the oil path switching valve 5, the gear selection valve 12, the pressure switching valve 9 and the flow switching valve 19, and the spools of the control valves are arranged in the corresponding valve cavities respectively, so that the spools and the valve cavities form a cooperation to constitute the control valves with corresponding functions. Correspondingly, since the gear selection valve 12, the pressure switching valve 9 and the flow switching valve 19 are all solenoid valves, the outside of the upper valve body 241 is provided with solenoid heads corresponding to the spools of the gear selection valve 12, the pressure switching valve 9 and the flow switching valve 19, so as to realize the corresponding switching operation. As for the oil path switching valve 5, the feedback cavity 501 is communicated with the high-pressure oil path 6 through the feedback oil path 8 arranged in the valve body 24.

[0094] In the embodiment, the oil supply module 4 is also integrated in the inside of the valve body 24. For example, referring to Figure 1 , the inside of the lower valve body 243 is provided with a pump cavity which is communicated with the oil suction port 2 of the lower valve body 243, and the stator and the rotor of the oil pump 402 are arranged in the pump cavity, so that the stator and the rotor of the oil pump 402 are combined with the lower valve body 243 to constitute the oil pump 402; the inside of the upper valve body 241 is provided with a motor cavity which is opposite to the pump cavity, and the rotor, the stator, the shaft and other components of the oil pump motor 401 are arranged in the motor cavity, and the shaft of the oil pump motor 401 extends downward into the pump cavity and is connected with the rotor of the oil pump 402, and the cover plate 4011 of the oil pump motor 401 covers the upper end of the motor cavity, so that the upper valve body 241 is used as the shell of the oil pump motor 401, and the oil pump motor 401 is integrated on the valve body 24 as a whole.

[0095] Correspondingly, referring to Figure 8 , the cooling and lubricating flow channel 4012 of the oil pump motor 401 is also arranged in the lower valve body 243, the upper valve body 241 and the motor cover plate 4011. For example, Figure 5 exemplarily shows that along the direction from the oil inlet to the oil outlet, the cooling and lubricating flow channel 4012 passes through the lower valve body 243, the upper valve body 241, the motor cover plate 4011, the motor cavity and the lower valve body 243 in sequence.

[0096] Referring to Figure 5 , the fine filter 23 is also integrated on the valve body 24, and the filter element of the fine filter 23 is arranged in the upper valve body 241, and the fine filter 23 is located on the gear shaft lubricating oil path 22, so as to realize the integrated arrangement of the fine filter 23.

[0097] Referring to Figure 7 and​ The thermostat 14 and the oil cooler 17 are also integrally arranged in the valve body 24.

[0098] Based on the above structural design, the components of the hydraulic control system are integrated in the valve body 24 to form a modular structure, so that the compactness and lightness of the structure can be realized, and the difficulty of layout of the hybrid box assembly design is reduced; the electronic oil pump as a whole, the shell filter and the solenoid valve do not need to be purchased again, so that the procurement cost of the hydraulic control system is reduced.

[0099] The utility model embodiment further provides a vehicle, it includes hybrid box hydraulic control system of any embodiment above.

[0100] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the description.

[0101] The above embodiments only express several implementation manners of the application, the description is more specific and detailed, but it should not be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled in the art, on the premise of not departing from the concept of the application, a number of modifications and improvements can be made, which belong to the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A hybrid case hydraulic control system, characterized by, The hydraulic control system comprises: a hydraulic oil circuit comprising a main oil circuit (1) and a working oil circuit, the working oil circuit comprising a low-pressure oil circuit (7) and a high-pressure oil circuit (6); an oil supply module (4) connected to the main oil circuit (1) for supplying oil to the main oil circuit (1); a pressure switch valve (9) arranged on the high-pressure oil circuit (6) for controlling the opening and closing of the high-pressure oil circuit (6); an oil circuit switching valve (5) arranged between the main oil circuit (1) and the low-pressure oil circuit (7) and the high-pressure oil circuit (6) for switching the communication state of the main oil circuit (1) with the low-pressure oil circuit (7) or the high-pressure oil circuit (6) according to the change of oil pressure in a feedback cavity (501) thereof; wherein the feedback cavity (501) is communicated to the high-pressure oil circuit (6) through a feedback oil circuit (8), and one end of the feedback oil circuit (8) connected to the high-pressure oil circuit (6) is located between the pressure switch valve (9) and the oil circuit switching valve (5).

2. The hydraulic control system of the hybrid transmission according to claim 1, wherein: the oil circuit switching valve (5) has an input end, a first output end and a second output end, the input end is connected to the main oil circuit (1), the first output end is connected to the high-pressure oil circuit (6), and the second output end is connected to the low-pressure oil circuit (7); the working state of the oil circuit switching valve (5) comprises: a first working state: the input end is communicated with the first output end to supply oil to the high-pressure oil circuit (6); a second working state: the input end is communicated with the second output end to supply oil to the low-pressure oil circuit (7); the trigger condition of the working state switching is that the oil pressure in the feedback cavity (501) reaches a preset critical value.

3. The hybrid case hydraulic control system of claim 2, wherein: the preset critical value is set by an elastic reset member (502) acting on a valve core of the oil circuit switching valve (5); the action direction of the elastic reset member (502) on the valve core is opposite to the oil pressure action direction of the feedback cavity (501).

4. The hydraulic control system of the hybrid transmission according to claim 1, wherein: the oil supply module (4) comprises an oil pump (402) arranged on the main oil circuit (1) and an oil pump motor (401) driving the oil pump (402); an internal cooling and lubricating flow channel (4012) is arranged in the oil pump motor (401), and the cooling and lubricating flow channel (4012) is communicated with the main oil circuit (1).

5. The hybrid case hydraulic control system of claim 4, wherein: a one-way valve (3) is arranged on the main oil circuit (1), the one-way valve (3) is located between the oil suction port (2) of the main oil circuit (1) and the oil pump (402), and is opened in one direction from the oil suction port (2) to the oil pump (402).

6. The hydraulic control system of the hybrid transmission according to claim 1, wherein: the high-pressure oil circuit (6) comprises a first gear control oil circuit (10) and a second gear control oil circuit (11) located downstream of the pressure switch valve (9); a gear selection valve (12) is arranged on the high-pressure oil circuit (6) for controlling the opening and closing of the first gear control oil circuit (10) and the second gear control oil circuit (11).

7. The hybrid powerpack hydraulic control system according to claim 1, characterized in that: the low-pressure oil circuit (7) comprises a pinion shaft lubrication oil circuit (22) and a motor cooling oil circuit (18) arranged in parallel; wherein, the pinion shaft lubrication oil circuit (22) is provided with a fine filter (23); the motor cooling oil circuit (18) is provided with a flow switching valve (19), the flow switching valve (19) comprising an oil inlet end and two oil outlet ends, the oil inlet end being connected to the second output end of the oil circuit switching valve (5), and the two oil outlet ends being respectively connected with a first cooling flow channel (20) and a second cooling flow channel (21); the flow switching valve (19) is used to control the oil inlet end to communicate with the first cooling flow channel (20) and / or the second cooling flow channel (21).

8. The hybrid powerpack hydraulic control system according to claim 7, characterized in that: the low-pressure oil circuit (7) is provided with a thermostat (14) and an oil cooler (17); the thermostat (14) has an oil inlet and two oil outlets, the oil inlet being communicated to the second output end of the oil circuit switching valve (5), and the two oil outlets being respectively connected with a normal-temperature oil circuit (15) and a cooling oil circuit (16), and the oil cooler (17) being arranged on the cooling oil circuit (16); the normal-temperature oil circuit (15) and the cooling oil circuit (16) are both connected to the pinion shaft lubrication oil circuit (22) and the motor cooling oil circuit (18); the thermostat (14) is used to control the oil inlet to communicate with the normal-temperature oil circuit (15) and / or the cooling oil circuit (16) according to the temperature of the hydraulic oil.

9. The hybrid case hydraulic control system of claim 1, wherein: the hybrid powerpack hydraulic control system further comprises a valve body (24); the hydraulic oil circuit, the oil supply module (4), the pressure switch valve (9) and the oil circuit switching valve (5) are all arranged in the valve body (24).

10. A vehicle characterized by: The hybrid powerpack hydraulic control system according to any one of claims 1-9.

Images