A pressure regulating system, hybrid box and vehicle

Abstract

The application discloses a pressure regulating system, a hybrid box and a vehicle, and relates to the technical field of vehicle energy saving, wherein the pressure regulating system comprises an oil pool, a mechanical pump, a pressure switch valve, a hydraulic motor, a clutch, a motor, a motor controller and a battery, the inlet end of the mechanical pump is communicated with the oil pool, the outlet end of the mechanical pump is communicated with the inlet end of the pressure switch valve, when the pressure switch valve is powered, the outlet end of the pressure switch valve is respectively communicated with the inlet end of the clutch and the inlet end of the hydraulic motor, the output shaft of the hydraulic motor is connected with the motor, and the motor controller is connected with the motor and the battery. The pressure regulating system of the application can suck the oil in the oil pool through the mechanical pump, and supply the oil to the clutch and the hydraulic motor through the adjustment of the pressure switch valve, the oil entering the hydraulic motor can drive the hydraulic motor to rotate and drive the motor to rotate, the motor controller can apply opposite direction electromotive force and torque to the rotating motor, so that the motor generates electricity and stores in the battery, and energy recovery is realized.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a pressure regulation system, a hybrid gearbox, and a vehicle. Background Technology

[0002] Currently, most dual-motor hybrid transmissions with clutch direct drive on the market have two oil pumps. One is a mechanical pump that supplies oil to the clutch high-pressure control system. After the high-pressure oil supply satisfies the clutch drive, any excess oil enters the cooling and lubrication system. The other is an electronic pump that supplies oil to the cooling and lubrication system. As described in Chinese Patent Publication No. CN213479137U, the oil supplied by the electronic pump and the oil overflowing from the clutch control high-pressure system passes through an oil cooler before being distributed to various cooling and lubrication components for cooling and lubrication.

[0003] Mechanical pumps are primarily powered by engines or wheel wells. The pump speed is coupled to the engine or vehicle speed; the higher the engine speed or vehicle speed, the higher the pump speed. Since the pump's displacement is fixed, the more oil is pumped out with increasing pump speed, resulting in greater power consumption. However, the flow rate required for high-pressure systems and cooling / lubrication is limited, leading to waste. The pressure required by the clutch or the main system pressure needs to be adjusted via solenoid valves, which is costly. When the engine is in direct drive mode, the hydraulic system consumes a lot of energy, and there is no energy recovery. Summary of the Invention

[0004] The purpose of this invention is to provide a pressure regulation system, a hybrid gearbox, and a vehicle to solve the problems in the prior art, thereby regulating system pressure while recovering energy.

[0005] In a first aspect, the present invention provides a pressure regulating system, comprising an oil sump, a mechanical pump, a pressure switching valve, a hydraulic motor, a clutch, an electric motor, a motor controller, and a storage battery, wherein:

[0006] The inlet end of the mechanical pump is connected to the oil sump, and the outlet end of the mechanical pump is connected to the inlet end of the pressure switch valve. When the pressure switch valve is energized, the outlet end of the pressure switch valve is connected to the inlet end of the clutch and the inlet end of the hydraulic motor, respectively.

[0007] The output shaft of the hydraulic motor is connected to the motor, and the motor controller is connected to both the motor and the battery.

[0008] In the pressure regulation system described above, preferably, a pressure sensor is provided on the connecting pipeline between the pressure switching valve and the hydraulic motor.

[0009] In the pressure regulating system described above, preferably, the outlet end of the hydraulic motor is connected to a cooling and lubrication system.

[0010] In the pressure regulating system described above, preferably, a first check valve is provided on the connecting pipeline between the hydraulic motor and the cooling and lubrication system.

[0011] In the pressure regulating system described above, preferably, when the pressure switch valve is de-energized, the outlet end of the pressure switch valve is connected to the cooling and lubrication system.

[0012] In the pressure regulating system described above, preferably, a second check valve is provided on the connecting pipeline between the pressure switching valve and the cooling and lubrication system.

[0013] In the pressure regulating system described above, preferably, the pressure regulating system further includes an oil suction switching valve, the inlet end of which is connected to the oil sump, and the outlet end of which is connected to the inlet end of the hydraulic motor.

[0014] In the pressure regulating system described above, preferably, an oil suction filter is provided at the outlet end of the oil tank.

[0015] Secondly, the present invention provides a hybrid box including the aforementioned pressure regulation system.

[0016] Thirdly, the present invention provides a vehicle including the aforementioned hybrid gearbox.

[0017] Compared with the prior art, the pressure regulation system of the present invention draws oil from the oil tank through a mechanical pump, and supplies oil to the clutch and hydraulic motor respectively through the adjustment of the pressure switch valve. The oil entering the hydraulic motor can drive the hydraulic motor to rotate, thereby driving the motor to rotate. The motor controller applies an electromotive force and torque in the opposite direction to the rotating motor, so that the motor generates electricity, which is stored in the battery, thus realizing energy recovery. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the pressure regulation system in the direct drive mode of the engine provided in an embodiment of the present invention;

[0019] Figure 2 This is a transmission route diagram in the engine direct drive mode provided by an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the pressure regulation system in the extended-range driving mode provided in an embodiment of the present invention;

[0021] Figure 4 This is a transmission route diagram in the range-extended driving mode provided by an embodiment of the present invention;

[0022] Figure 5This is a schematic diagram of the pressure regulation system in pure electric driving mode provided in an embodiment of the present invention;

[0023] Figure 6 This is a transmission route diagram in pure electric driving mode provided by an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the pressure regulation system in the stationary parking power generation mode provided in an embodiment of the present invention;

[0025] Figure 8 This is a transmission route diagram in the stationary parking power generation mode provided by an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Oil sump, 2-Mechanical pump, 3-Pressure switch valve, 4-Hydraulic motor, 5-Clutch, 6-Motor, 7-Motor controller, 8-Battery, 9-Pressure sensor, 10-Cooling and lubrication system, 11-First check valve, 12-Second check valve, 13-Oil suction switching valve, 14-Oil suction filter, 15-Engine, 16-Wheel end, 17-P1 motor, 18-P3 motor. Detailed Implementation

[0028] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] Firstly, referring to Figure 1 and Figure 2 As shown, the present invention provides a pressure regulating system, including an oil sump 1, a mechanical pump 2, a pressure switching valve 3, a clutch 5, a motor 6, a motor controller 7, and a battery 8, wherein:

[0030] The inlet end of the mechanical pump 2 is connected to the oil tank 1, and the outlet end of the mechanical pump 2 is connected to the inlet end of the pressure switch valve 3. When the pressure switch valve 3 is energized, the outlet end of the pressure switch valve 3 is connected to the inlet end of the clutch 5 and the inlet end of the hydraulic motor 4 respectively. The output shaft of the hydraulic motor 4 is connected to the motor 6, and the motor controller 7 is connected to the motor 6 and the battery 8 respectively.

[0031] The pressure regulating system also includes an oil suction switching valve 13, the inlet end of which is connected to the oil sump 1, and the outlet end of which is connected to the inlet end of the hydraulic motor 4.

[0032] To ensure the cleanliness of the oil entering the system, an oil suction filter 14 is installed at the outlet of the oil tank 1. After the oil is filtered by the oil suction filter 14, particulate impurities in the oil are filtered out, which can effectively prevent impurities in the oil from damaging downstream equipment, thereby improving the reliability and stability of the hydraulic system.

[0033] In the embodiments provided in this application, in the direct drive mode of engine 15, engine 15 is connected to wheel end 16 through clutch 5 to directly drive the vehicle forward. When engine 15 starts, it drives mechanical pump 2 to work, drawing oil from oil sump 1. At the same time, pressure switch valve 3 is energized and works, and oil enters the oil chamber of clutch 5 through pressure switch valve 3 to fill it. The pressure of the oil pushes the oil suction switching valve 13 to close. At the same time, some oil passes through hydraulic motor 4, pushing hydraulic motor 4 to rotate, thereby driving motor 6 to rotate. Motor controller 7 applies electromotive force and torque in the opposite direction to the rotating motor 6, so that motor 6 generates electricity and stores it in battery 8 to realize energy recovery.

[0034] During the rotation of the hydraulic motor 4, the negative torque of the energy recovery of the motor 6 will hinder the rotation of the hydraulic motor 4, causing the oil entering the hydraulic motor 4 to generate pressure. At this time, the pressure at the front end of the hydraulic motor 4 is the oil filling pressure of the clutch chamber. In order to recover energy while meeting the pressure requirements of the clutch 5, in a feasible implementation, a pressure sensor 9 is provided on the connecting pipeline between the pressure switch valve 3 and the hydraulic motor 4.

[0035] Pressure sensor 9 can monitor the clutch chamber filling pressure. When the clutch chamber filling pressure is less than the required engagement pressure of clutch 5, the energy recovery torque of motor 6 can be increased to improve the energy recovery power and increase the clutch chamber filling pressure. When the clutch chamber filling pressure is greater than the required engagement pressure of clutch 5, the energy recovery torque of motor 6 needs to be reduced to decrease the energy recovery power and reduce the clutch chamber filling pressure to meet the pressure requirements of clutch 5. This achieves linear control and closed-loop regulation of clutch 5 pressure and energy recovery.

[0036] Specifically, in this process, the power of the rotational energy recovery of the hydraulic motor 4 driving the motor 6 is Pm*Q*η, where Pm is the oil filling pressure of the clutch chamber, Q is the oil flow rate, and η (η<1) is the efficiency of converting the rotational energy of the motor 6 into electrical energy.

[0037] After the oil flowing out of pressure switch valve 3 meets the pressure requirements of clutch 5 and the energy recovery requirements, a portion of the oil flowing through hydraulic motor 4 will flow to cooling and lubrication system 10 to supply oil to the cooling and lubrication system 10. Therefore, the outlet end of hydraulic motor 4 is connected to cooling and lubrication system 10. In order to prevent the backflow of oil flowing to cooling and lubrication system 10 from affecting the oil filling pressure of clutch chamber, a first check valve 11 is provided on the connecting pipeline between hydraulic motor 4 and cooling and lubrication system 10. Under the action of the first check valve 11, the oil flowing from hydraulic motor 4 to cooling and lubrication system 10 can only flow in one direction and cannot flow back to hydraulic motor 4, thereby ensuring the reliability and stability of hydraulic system.

[0038] When clutch 5 is not engaged, mechanical pump 2 can directly input oil from oil sump 1 into cooling and lubrication system 10. Therefore, when pressure switch valve 3 is de-energized, the outlet end of pressure switch valve 3 is connected to cooling and lubrication system 10. Figure 3 and Figure 4 As shown, in range-extended driving mode, engine 15 drives P1 motor 17 to generate electricity, P3 motor 18 drives the wheels to move, engine 15 is disconnected from the wheels, clutch 5 is not working, engine 15 drives mechanical pump 2 to work, causing pressure switch valve 3 to be de-energized and reversed, and oil enters cooling and lubrication system 10 after passing through pressure switch valve 3.

[0039] To prevent oil backflow, a second check valve 12 is provided on the connecting pipeline between the pressure switch valve 3 and the cooling and lubrication system 10. Based on the guiding effect of the second check valve 12, the oil flowing through the pressure switch valve 3 can only flow to the cooling and lubrication system 10, thus preventing oil backflow.

[0040] Furthermore, due to the de-energization and reversal of the pressure switch valve 3, there is no oil pressure on the left side of the oil suction switching valve 13, causing the oil suction switching valve 13 to open to the right under the action of the spring force. At this time, since the dual motors 6 are working, the motors 6 require a larger cooling and lubrication flow. The motor controller 7 will control the motor 6 to drive the motor to rotate, drawing oil from the oil suction filter 14 through the oil suction switching valve 13, and then through the hydraulic motor 4 and the first check valve 11 to the cooling and lubrication system 10 to improve the cooling and lubrication effect.

[0041] Reference Figure 5 and Figure 6 As shown, in pure electric driving mode, P3 motor 18 drives the wheels, engine 15 does not start, mechanical pump 2 does not work, there is no oil pressure in the feedback chamber on the left side of oil suction switching valve 13, and oil suction switching valve 13 is in the right position under the action of the spring, so that the oil suction port of hydraulic motor 4 is connected to oil suction filter 14. Motor controller 7 drives motor 6 to rotate hydraulic motor 4, drawing oil from oil sump 1 through oil suction filter 14 into the oil inlet of hydraulic motor 4 and the first one-way valve 11, and then discharging it into cooling and lubrication system 10 to ensure cooling and lubrication of hybrid drive motor 6 and gear bearing system.

[0042] Reference Figure 7 and Figure 8 As shown, in the stationary parking power generation mode, the engine 15 drives the P1 motor 17 to generate electricity, the P3 motor 18 drives the wheels to move, the engine 15 is disconnected from the wheels, the clutch 5 is not working, the engine 15 drives the mechanical pump 2 to work, the pressure switch valve 3 is de-energized and reversed, and the oil enters the cooling and lubrication system 10 through the mechanical pump 2, the pressure switch valve 3 and the second check valve 12.

[0043] Secondly, the present invention provides a hybrid gearbox, including the aforementioned pressure regulating system. The hybrid gearbox with the aforementioned pressure regulating system can convert the power loss of the hydraulic system into electrical energy for storage, improving system efficiency and reducing system losses. Furthermore, it only requires the cooperation of the mechanical pump 2 and the pressure switching valve 3 to meet the pressure requirements of the clutch 5 and the main system, thus reducing costs.

[0044] Thirdly, the present invention provides a vehicle including the aforementioned hybrid gearbox. In direct-drive mode, the vehicle can recover energy while meeting the pressure requirements of the clutch 5; when the mechanical pump 2 is not operating, the motor controller 7 can drive the hydraulic motor 4 to draw oil to supply oil to the cooling and lubrication system 10, thereby releasing energy. The system pressure can be intelligently adjusted by the load of the hydraulic motor 4, eliminating the need for a proportional solenoid valve and thus saving costs. Furthermore, the vehicle can supply oil to the cooling and lubrication system 10 in different modes, meeting the cooling and lubrication requirements.

[0045] The above description, based on the embodiments shown in the figures, details the structure, features, and effects of the present invention. The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to have equivalent changes, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of the present invention.

Claims

1. A pressure regulating system, characterized in that, Includes an oil tank, mechanical pump, pressure switching valve, hydraulic motor, clutch, electric motor, motor controller, and battery, among which: The inlet end of the mechanical pump is connected to the oil sump, and the outlet end of the mechanical pump is connected to the inlet end of the pressure switch valve. When the pressure switch valve is energized, the outlet end of the pressure switch valve is connected to the inlet end of the clutch and the inlet end of the hydraulic motor, respectively. The output shaft of the hydraulic motor is connected to the motor, and the motor controller is connected to both the motor and the battery. The pressure regulating system also includes an oil suction switching valve, the inlet end of which is connected to the oil sump, and the outlet end of which is connected to the inlet end of the hydraulic motor. In engine direct drive mode, the mechanical pump operates, drawing oil from the oil sump. Simultaneously, the pressure switch valve is energized and opens, allowing oil to enter the clutch oil chamber through the pressure switch valve. The oil pressure pushes the oil suction switching valve to close. At the same time, some oil passes through the hydraulic motor, driving the hydraulic motor to rotate and in turn driving the motor to rotate. The motor controller applies an electromotive force and torque in the opposite direction to the rotating motor, causing the motor to generate electricity, which is stored in the battery to achieve energy recovery. In pure electric driving mode, the mechanical pump does not work, there is no oil pressure in the feedback chamber on the left side of the oil suction switching valve, the oil suction switching valve is in the right position, so that the oil suction port of the hydraulic motor is connected to the oil sump; the motor controller drives the motor to rotate the hydraulic motor, sucking oil from the oil sump into the oil inlet of the hydraulic motor, and discharging it into the cooling and lubrication system.

2. The pressure regulating system according to claim 1, characterized in that, A pressure sensor is installed on the connecting pipeline between the pressure switch valve and the hydraulic motor.

3. The pressure regulating system according to claim 1, characterized in that, The outlet end of the hydraulic motor is connected to the cooling and lubrication system.

4. The pressure regulating system according to claim 3, characterized in that, A first check valve is provided on the connecting pipe between the hydraulic motor and the cooling and lubrication system.

5. The pressure regulating system according to claim 3, characterized in that, When the pressure switch valve is de-energized, the outlet end of the pressure switch valve is connected to the cooling and lubrication system.

6. The pressure regulating system according to claim 5, characterized in that, A second check valve is provided on the connecting pipeline between the pressure switch valve and the cooling and lubrication system.

7. The pressure regulating system according to claim 1, characterized in that, An oil suction filter is provided at the outlet end of the oil tank.

8. A hybrid box, characterized in that, Includes the pressure regulating system according to any one of claims 1 to 7.

9. A vehicle, characterized in that, Includes the hybrid box as described in claim 8.

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