Hydraulic system for lubricating oil flow control in P2 configuration transmissions

Abstract

This invention discloses a hydraulic system for lubricating oil flow control in a P2 configuration transmission, comprising a first lubricating oil circuit, a second lubricating oil circuit, and a third lubricating oil circuit, as well as a first oil tank, an oil suction filter, a low-pressure oil inlet circuit, a motor, a low-pressure oil pump, a main oil circuit, a bypass valve oil circuit, a bypass valve, a bypass valve inlet oil circuit, a bypass valve outlet oil circuit, a first oil circuit, a pressure relief oil circuit, a pressure relief valve, a first feedback oil passage, a second feedback oil passage, a second oil circuit, a first lubrication valve, a first solenoid valve, and a third oil circuit. This invention effectively solves the problem of lubrication flow distribution in a P2 configuration transmission, and also improves the service life of components and reduces operating costs.

Description

Technical Field

[0001] This invention relates to the field of dual-clutch transmission technology, and more specifically to a hydraulic system for controlling the flow of lubricating oil in a P2 configuration transmission. Background Technology

[0002] Hybrid power, as commonly referred to, generally refers to gasoline-electric hybrid power, which combines fuel (gasoline, diesel, etc.) and electricity. Hybrid electric vehicles use an electric motor as an auxiliary power source to drive the car. As an intermediate product between traditional gasoline vehicles and pure electric vehicles, and with pure electric vehicle technology still immature, the hydraulic system of hybrid transmissions has become a key product that major automakers are vying to develop, leading to the emergence of P2 hybrid transmissions. This has resulted in increasingly higher demands for clutch lubrication. It is necessary to ensure that the clutches do not burn during normal operation, while also achieving more precise control to improve lubrication efficiency and ensure fuel economy. If a single solenoid valve is still used for control, or only mechanical valves are used for logic control, it is difficult to simultaneously meet the lubrication and cooling needs of each clutch. Summary of the Invention

[0003] This invention provides a hydraulic system for controlling the lubricating oil flow in a P2 configuration transmission, which effectively solves the problem of lubricating flow distribution in a P2 configuration transmission.

[0004] The technical solutions to the above technical problems are as follows:

[0005] A hydraulic system for controlling the lubricating oil flow in a P2 configuration transmission includes a first lubricating oil circuit, a second lubricating oil circuit, and a third lubricating oil circuit. It also includes a first oil tank, a suction filter, a low-pressure inlet oil circuit, a motor, a low-pressure oil pump, a main oil circuit, a bypass valve circuit, a bypass valve, a bypass valve inlet oil circuit, a bypass valve outlet oil circuit, a first oil circuit, a pressure relief oil circuit, a pressure relief valve, a first feedback oil passage, a second feedback oil passage, a second oil circuit, a first lubricating valve, a first solenoid valve, and a third oil circuit. One end of the suction filter is connected to the first oil tank, and the other end is connected to the low-pressure inlet oil circuit. The low-pressure oil pump is connected to the motor, with one end connected to the low-pressure inlet oil circuit and the other end connected to the main oil circuit. One end of the bypass valve circuit is connected to the main oil circuit, and the other end is connected to the first control terminal of the bypass valve. The second control terminal of the bypass valve is connected to the third oil circuit. One end of the bypass valve inlet oil circuit is connected to the bypass valve circuit, and the other end is connected to... The bypass valve's inlet is connected to the bypass valve's outlet, and the other end is connected to the third oil circuit. The third oil circuit is connected to the first oil circuit, and the first oil circuit is connected to the first lubrication circuit, the second lubrication circuit, and the third lubrication circuit. One end of the pressure relief oil circuit is connected to the low-pressure inlet, and the other end is connected to the pressure relief valve's return outlet. One end of the first feedback oil passage is connected to the first control end of the pressure relief valve, and the other end is connected to the first lubrication circuit. One end of the second feedback oil passage is connected to the first oil circuit, and the other end is connected to the second control end of the pressure relief valve. The pressure relief valve's return inlet is connected to the first oil circuit. One end of the first solenoid valve is connected to the first lubrication circuit, and the other end is connected to the first oil circuit. One end of the second oil circuit is connected to the first oil circuit, and the other end is connected to the third lubrication circuit. The inlet of the first lubrication valve is connected to the first oil circuit, and the outlet of the first lubrication valve is connected to the third lubrication circuit.

[0006] Furthermore, it also includes a second oil tank, a high-pressure oil pump, a high-pressure filter, a check valve, a high-pressure relief valve, a second solenoid valve, a third oil passage, a fourth oil passage, a main pressure sensor, a third solenoid valve, a third feedback oil circuit, a pressure sensor, a control oil circuit, a fifth oil passage, and an accumulator. The high-pressure oil pump is connected in series with the motor, and one end of the high-pressure oil pump is connected to the second oil tank, while the other end is connected to the inlet of the high-pressure filter. The outlet of the high-pressure relief valve is connected to the main high-pressure oil circuit, and the check valve is connected to the outlet of the high-pressure relief valve on the main high-pressure oil circuit. One end of the fifth oil passage is connected to the main high-pressure oil circuit, and the other end is connected to one end of the second solenoid valve. One end of the third oil passage is connected to the fourth oil passage, and the other end is connected to the other end of the second solenoid valve. The accumulator is connected to the high-pressure main oil line. The check valve is connected to the high-pressure main oil line between the high-pressure oil pump and the accumulator. The other end of the third oil passage is connected to the high-pressure main oil line. One end of the fourth oil passage is connected to the high-pressure main oil line, and the other end is connected to one end of the main pressure sensor. The other end of the main pressure sensor is connected to one end of the third solenoid valve. The other end of the third solenoid valve is connected to one end of the third feedback oil line. The control oil line and the pressure sensor are connected in series in the third feedback oil line. The other end of the third feedback oil line is connected to the first control end of the first lubrication valve.

[0007] Furthermore, it also includes a cooling filter oil circuit, a heat exchanger, a low-pressure filter, and a low-pressure filter outlet oil circuit. One end of the cooling filter oil circuit is connected to the main oil circuit, and the other end is connected to one end of the heat exchanger. The other end of the heat exchanger is connected to one end of the low-pressure filter. The other end of the low-pressure filter is connected to one end of the low-pressure filter outlet oil circuit, and the other end of the low-pressure filter outlet oil circuit is connected to a third oil circuit.

[0008] Furthermore, it also includes an oil drain passage, one end of which is connected to the first oil tank and the other end of which is connected to the second oil tank.

[0009] The hydraulic system for lubricating oil flow control in a P2 configuration transmission provided by this invention has several advantages. First, the clutch uses a solenoid valve to control the lubrication flow, which can meet its instantaneous high lubrication flow requirements. Furthermore, the motor is connected in series with both a high-pressure oil pump and a low-pressure oil pump, effectively reducing manufacturing costs. Second, the clutch mechanical valve adjusts the valve opening by controlling the oil circuit feedback pressure, effectively providing the appropriate lubrication flow according to lubrication needs. Third, the accumulator acts as a power source, effectively reducing the load on the high-pressure oil pump and extending its service life. Separate oil supply and control for high and low pressure systems allow for on-demand control of the cleanliness of relevant components, reducing manufacturing and process costs. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the hydraulic system for controlling the lubricating oil flow of the P2 configuration transmission of the present invention.

[0011] Labels in the attached diagram:

[0012] 1. First oil tank; 2. Suction filter; 3. Motor; 4. Pressure relief oil circuit; 5. Low-pressure oil pump; 6. Main oil circuit; 7. Bypass valve oil circuit; 8. Bypass valve; 9. Pressure relief valve; 10. First feedback oil passage; 11. First oil circuit; 12. First lubrication oil circuit; 13. Oil drain oil passage; 14. Second oil tank; 15. High-pressure oil pump; 16. High-pressure pressure relief valve; 17. Second solenoid valve; 18. High-pressure filter; 19. Check valve; 20. Third oil passage; 21. Fourth oil passage; 22. Main pressure sensor; 23. Heat exchanger; 24. Accumulator; 25. Cooling filter oil circuit; 26. Third solenoid valve. Valve 26, low-pressure filter 27, low-pressure filter outlet oil passage 28, second lubrication oil passage 29, second oil passage 30, first lubrication valve 31, third feedback oil passage 32, pressure sensor 33, control oil passage 34, third lubrication oil passage 35, first solenoid valve 36, second feedback oil passage 37, low-pressure inlet oil passage 38, fifth oil passage 39, third oil passage 50, bypass valve inlet oil passage 52, bypass valve outlet oil passage 55, first clutch K0, second clutch K1 / K2, shaft gear assembly K3, control oil passage pressure K0p. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0014] like Figure 1As shown, the hydraulic system for lubricating oil flow control in a P2 configuration transmission includes a first lubricating oil circuit 12, a second lubricating oil circuit 29, and a third lubricating oil circuit 35. It also includes a first oil tank 1, a suction filter 2, a low-pressure inlet oil circuit 38, a motor 3, a low-pressure oil pump 5, a main oil circuit 6, a bypass valve oil circuit 7, a bypass valve 8, a bypass valve inlet oil circuit 52, a bypass valve outlet oil circuit 55, a first oil circuit 11, a pressure relief oil circuit 4, a pressure relief valve 9, a first feedback oil passage 10, a second feedback oil passage 37, a second oil circuit 30, and a first lubricating... Valve 31, first solenoid valve 36, third oil circuit 50, the oil suction filter 2 is connected at one end to the first oil tank 1 and at the other end to the low-pressure oil inlet circuit 38, the low-pressure oil pump 5 is connected to the motor 3, and at one end of the low-pressure oil pump 5 is connected to the low-pressure oil inlet circuit 38 and at the other end to the main oil circuit 6, the bypass valve oil circuit 7 is connected at one end to the main oil circuit 6 and at the other end to the first control terminal of the bypass valve 8, the second control terminal of the bypass valve 8 is connected to the third oil circuit 50, and the bypass valve inlet oil circuit 52 is connected at one end to the bypass valve oil circuit 7 and at the other end... The bypass valve 8 is connected to its inlet. One end of the bypass valve outlet oil passage 55 is connected to the outlet of the bypass valve 8, and the other end is connected to the third oil passage 50. The third oil passage 50 is connected to the first oil passage 11. The first oil passage 11 is connected to the first lubricating oil passage 12, the second lubricating oil passage 29, and the third lubricating oil passage 35. One end of the pressure relief oil passage 4 is connected to the low-pressure inlet oil passage 38, and the other end is connected to the return oil outlet of the pressure relief valve 9. One end of the first feedback oil passage 10 is connected to the first control end of the pressure relief valve 9, and the other end is connected to the first lubricating oil passage 12. The connection is as follows: one end of the second feedback oil passage 37 is connected to the first oil passage 11, and the other end is connected to the second control end of the pressure relief valve 9. The return oil inlet of the pressure relief valve 9 is connected to the first oil passage 11. One end of the first solenoid valve 36 is connected to the first lubricating oil passage 12, and the other end is connected to the first oil passage 11. One end of the second oil passage 30 is connected to the first oil passage 11, and the other end is connected to the third lubricating oil passage 35. The oil inlet of the first lubricating valve 31 is connected to the first oil passage 11, and the oil outlet of the first lubricating valve 31 is connected to the third lubricating oil passage 35.

[0015] In this embodiment, the motor 3 drives the low-pressure oil pump 5 to directly draw oil from the first oil tank 1. The lubricating oil enters the suction filter 2 from the inlet end of the suction filter 2, is filtered in the suction filter 2, and then enters the low-pressure oil inlet circuit 38 from the outlet end of the suction filter 2. The lubricating oil then flows to the main oil circuit 6, and from the main oil circuit 6 to the bypass valve oil circuit 7. It then flows through the inlet end of the bypass valve 8 to the outlet end of the bypass valve 8, and then to the bypass valve outlet oil circuit 55, and finally to the third oil circuit. 50, and flows from the third oil passage 50 into the main oil passage 6, and then from the main oil passage 6 into the first lubricating oil passage 12, which provides lubricating oil for the second clutch K1 / K2. From the main oil passage 6, it flows into the second lubricating oil passage 29, which provides lubricating oil for the shaft gear assembly K3. From the main oil passage 6, it flows into the second oil passage 30, and then from the second oil passage 30 into the third lubricating oil passage 35, which provides lubricating oil for the first clutch K0.

[0016] In this embodiment, the flow rate in the first lubrication circuit 12 is directly controlled by the first solenoid valve 36, which can meet the instantaneous high flow lubrication requirements of the K1 / K2 clutch. The oil inlet of the pressure relief valve 9 is connected to the oil circuit 11. The first control end of the pressure relief valve 9 is connected to the first lubrication circuit 12 through the first feedback oil passage 10, and the second control end is connected to the oil circuit 11 through the second feedback oil passage 37. The opening degree of the pressure relief valve 9 is controlled by the oil pressure difference generated between the sum of the hydraulic pressure of the first feedback oil passage 10 and the spring force of the pressure relief valve 9 and the hydraulic pressure of the second feedback oil passage 37, thereby releasing excess oil and ensuring that the oil pressure in the end oil circuit is not too high.

[0017] Preferably, the system also includes a second oil tank 14, a high-pressure oil pump 15, a high-pressure filter 18, a one-way valve 19, a high-pressure relief valve 16, a second solenoid valve 17, a third oil passage 20, a fourth oil passage 21, a main pressure sensor 22, a third solenoid valve 26, a third feedback oil circuit 32, a pressure sensor 33, a control oil circuit 34, a fifth oil passage 39, and an accumulator 24. The high-pressure oil pump 15 is connected in series with the motor 3, and one end of the high-pressure oil pump 15 is connected to the second oil tank 14, and the other end is connected to the oil inlet of the high-pressure filter 18. The oil outlet of the high-pressure relief valve 16 is connected to the main high-pressure oil circuit, and the one-way valve 19 is connected to the main high-pressure oil circuit at the oil outlet of the high-pressure relief valve 16. One end of the fifth oil passage 39 is connected to the main high-pressure oil circuit, and the other end is connected to the second solenoid valve 17. One end of the third oil passage 20 is connected to the fourth oil passage 21, and the other end is connected to the other end of the second solenoid valve 17. The accumulator 24 is connected to the high-pressure main oil line. The one-way valve 19 is connected to the high-pressure main oil line between the high-pressure oil pump 15 and the accumulator 24. The other end of the third oil passage 20 is connected to the high-pressure main oil line. One end of the fourth oil passage 21 is connected to the high-pressure main oil line, and the other end is connected to one end of the main pressure sensor 22. The other end of the main pressure sensor 22 is connected to one end of the third solenoid valve 26. The other end of the third solenoid valve 26 is connected to one end of the third feedback oil line 32. The control oil line 34 and the pressure sensor 33 are connected in series on the third feedback oil line 32. The other end of the third feedback oil line 32 is connected to the first control end of the first lubrication valve 31.

[0018] In this embodiment, the motor 3 drives the high-pressure oil pump 15 to directly draw oil from the second oil tank 14. After the lubricating oil is drawn into the high-pressure main oil circuit by the high-pressure oil pump 15, it first passes through the high-pressure filter 18 to filter the lubricating oil, and then enters the second solenoid valve 17 from the high-pressure filter 18, and flows from the second solenoid valve 17 to the third solenoid valve 26. Finally, it flows from the third solenoid valve 26 to the third feedback oil circuit 32. In this embodiment, the accumulator 24 monitors the pressure through the main pressure sensor 22, the third solenoid valve 26 is used to control the pressure in the control oil circuit 34, and the pressure sensor 33 provides feedback on the pressure of the control oil circuit 34. The first lubrication valve 31 is connected to the third feedback oil circuit 32. 2. The pressure (K0p) of the feedback control oil circuit 34 is used to regulate the pressure in the first lubrication valve 31. The high-pressure relief valve 16 is used to ensure that the high-pressure parts are not damaged when the second solenoid valve 17 fails or its function is weakened. In this embodiment, the accumulator 24, the one-way valve 19 and the third solenoid valve 26 form a closed oil circuit. After the high-pressure oil pump 15 is filled with oil, the accumulator 24 will serve as a power source to provide kinetic energy to the downstream actuators, so that the high-pressure oil pump 15 can work intermittently and reduce energy consumption. The second solenoid valve 17 can unload when the low-pressure area needs lubrication and the high-pressure area does not need flow through the five oil passages 39, and can relieve pressure at the end of the accumulator 24 through the third oil passage 20.

[0019] In this embodiment, the third lubrication circuit 35 has two paths: one is a constant oil supply circuit 30, used to supply oil to components that require constant lubrication or cooling; the other is a branch circuit through the first lubrication valve 31. When the first clutch K0 requires a large flow rate, it provides lubrication. The inlet of the first lubrication valve 31 is connected to the first oil circuit 11. The first lubrication valve 31 is connected to the control oil circuit 34 through the third feedback oil passage 32. The oil pressure difference generated between the spring force and the hydraulic pressure of the third feedback oil passage 32 controls the opening degree of the first lubrication valve 31.

[0020] Preferably, it also includes a cooling filter oil passage 25, a heat exchanger 23, a low-pressure filter 27, and a low-pressure filter outlet oil passage 28. One end of the cooling filter oil passage 25 is connected to the main oil passage 6, and the other end is connected to one end of the heat exchanger 23. The other end of the heat exchanger 23 is connected to one end of the low-pressure filter 27. The other end of the low-pressure filter 27 is connected to one end of the low-pressure filter outlet oil passage 28, and the other end of the low-pressure filter outlet oil passage 28 is connected to the third oil passage 50.

[0021] In this embodiment, the cooling filter oil circuit 25 is connected in series with the heat exchanger 23 and the low-pressure filter 27. When the oil is working normally, all of it will be output to the downstream end through the cooling filter oil circuit 25. The cooling filter oil circuit 25 is connected in parallel with the bypass valve oil circuit 7. The bypass valve 8 is connected in series with the bypass valve oil circuit 7 to prevent the pressure in the low-pressure area from becoming too high when the low-pressure filter 27 is blocked or the viscosity of the low-temperature oil is too high.

[0022] Preferably, it also includes an oil drain passage 13, one end of which is connected to the first oil tank 1 and the other end is connected to the second oil tank 14.

[0023] In this embodiment, the first oil tank 1 and the second oil tank 14 are separate independent oil tanks. When the oil level in the second oil tank 14 exceeds the specified oil level, it is drained into the first oil tank 1 through the drain channel 13.

[0024] In this embodiment, the second lubrication oil passage 29 and the second oil passage 30 are constantly supplied oil passages, and the fluid distribution can be controlled by adding throttling orifices to the second lubrication oil passage 29 and the second oil passage 30.

[0025] Finally, it should be noted that the above-described embodiments are merely preferred embodiments of the present invention used to illustrate the technical solutions of the present invention, and are not intended to limit them, much less limit the scope of protection of the present invention; although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of protection of the claims.

Claims

1. A hydraulic system for controlling the flow of lubricating oil in a P2 configuration transmission, comprising a first lubricating oil passage (12), a second lubricating oil passage (29), and a third lubricating oil passage (35), characterized in that; It also includes a first oil tank (1), a suction filter (2), a low-pressure oil inlet (38), a motor (3), a low-pressure oil pump (5), a main oil circuit (6), a bypass valve oil circuit (7), a bypass valve (8), a bypass valve inlet oil circuit (52), a bypass valve outlet oil circuit (55), a first oil circuit (11), a pressure relief oil circuit (4), a pressure relief valve (9), a first feedback oil passage (10), a second feedback oil passage (37), a second oil circuit (30), a first lubrication valve (31), a first solenoid valve (36), and a third oil circuit (50). One end of the suction filter (2) is connected to the first oil tank. The box (1) is connected, and the other end is connected to the low-pressure oil inlet circuit (38). The low-pressure oil pump (5) is connected to the motor (3), and one end of the low-pressure oil pump (5) is connected to the low-pressure oil inlet circuit (38), and the other end is connected to the main oil circuit (6). One end of the bypass valve oil circuit (7) is connected to the main oil circuit (6), and the other end is connected to the first control end of the bypass valve (8). The second control end of the bypass valve (8) is connected to the third oil circuit (50). One end of the bypass valve inlet oil circuit (52) is connected to the bypass valve oil circuit (7), and the other end is connected to the inlet end of the bypass valve (8). The bypass valve outlet oil circuit (55) One end of the bypass valve (8) is connected to the oil outlet, and the other end is connected to the third oil circuit (50). The third oil circuit (50) is connected to the first oil circuit (11). The first oil circuit (11) is connected to the first lubricating oil circuit (12), the second lubricating oil circuit (29), and the third lubricating oil circuit (35). One end of the pressure relief oil circuit (4) is connected to the low-pressure oil inlet circuit (38), and the other end is connected to the return oil outlet of the pressure relief valve (9). One end of the first feedback oil passage (10) is connected to the first control end of the pressure relief valve (9), and the other end is connected to the first lubricating oil circuit (12). The second feedback oil passage (3) is connected to the first control end of the pressure relief valve (9), and the other end is connected to the first lubricating oil circuit (12). One end of 7) is connected to the first oil circuit (11), and the other end is connected to the second control end of the pressure relief valve (9). The return oil inlet of the pressure relief valve (9) is connected to the first oil circuit (11). One end of the first solenoid valve (36) is connected to the first lubricating oil circuit (12), and the other end is connected to the first oil circuit (11). One end of the second oil circuit (30) is connected to the first oil circuit (11), and the other end is connected to the third lubricating oil circuit (35). The oil inlet of the first lubricating valve (31) is connected to the first oil circuit (11), and the oil outlet of the first lubricating valve (31) is connected to the third lubricating oil circuit (35).

2. The hydraulic system for lubricating oil flow control of a P2 configuration transmission according to claim 1, characterized in that; It also includes a second oil tank (14), a high-pressure oil pump (15), a high-pressure filter (18), a check valve (19), a high-pressure relief valve (16), a second solenoid valve (17), a third oil passage (20), a fourth oil passage (21), a main pressure sensor (22), a third solenoid valve (26), a third feedback oil circuit (32), a pressure sensor (33), a control oil circuit (34), a fifth oil passage (39), and an accumulator (24). The high-pressure oil pump (15) is connected in series with the motor (3), and one end of the high-pressure oil pump (15) is connected to the second oil tank (14), and the other end is connected to the oil inlet of the high-pressure filter (18). The oil outlet of the high-pressure relief valve (16) is connected to the main high-pressure oil circuit, and the check valve (19) is connected to the main high-pressure oil circuit at the oil outlet of the high-pressure relief valve (16). One end of the fifth oil passage (39) is connected to the main high-pressure oil circuit, and the other end is connected to the second solenoid valve (20). One end of the third oil passage (20) is connected to the fourth oil passage (21), and the other end is connected to the other end of the second solenoid valve (17). The accumulator (24) is connected to the high-pressure main oil line. The one-way valve (19) is connected to the high-pressure main oil line between the high-pressure oil pump (15) and the accumulator (24). The other end of the third oil passage (20) is connected to the high-pressure main oil line. One end of the fourth oil passage (21) is connected to the high-pressure main oil line, and the other end is connected to one end of the main pressure sensor (22). The other end of the main pressure sensor (22) is connected to one end of the third solenoid valve (26). The other end of the third solenoid valve (26) is connected to one end of the third feedback oil line (32). The control oil line (34) and the pressure sensor (33) are connected in series on the third feedback oil line (32). The other end of the third feedback oil line (32) is connected to the first control end of the first lubrication valve (31).

3. The hydraulic system for lubricating oil flow control of a P2 configuration transmission according to claim 1, characterized in that; It also includes a cooling filter oil passage (25), a heat exchanger (23), a low-pressure filter (27), and a low-pressure filter outlet oil passage (28). One end of the cooling filter oil passage (25) is connected to the main oil passage (6), and the other end is connected to one end of the heat exchanger (23). The other end of the heat exchanger (23) is connected to one end of the low-pressure filter (27). The other end of the low-pressure filter (27) is connected to one end of the low-pressure filter outlet oil passage (28), and the other end of the low-pressure filter outlet oil passage (28) is connected to the third oil passage (50).

4. The hydraulic system for lubricating oil flow control of a P2 configuration transmission according to claim 2, characterized in that; It also includes an oil drain channel (13), one end of which is connected to the first oil tank (1) and the other end is connected to the second oil tank (14).

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