Hydraulic control oil circuit for hydraulic torque converter

Abstract

A hydraulic control oil circuit for a hydraulic torque converter, the hydraulic control oil circuit comprising a one-way valve (5), an unlocking pressure control valve (2) and a pilot-operated solenoid valve (4), wherein an unlocking control oil circuit (10) is provided between the unlocking pressure control valve (2) and the hydraulic torque converter (1); the pilot-operated solenoid valve (4) is in communication with the unlocking pressure control valve (2) by means of a pilot-operated valve control oil circuit (12); the unlocking pressure control valve (2) is in communication with a first oil intake circuit (6); and the unlocking pressure control valve (2) is in communication with the one-way valve (5) by means of an oil drain circuit (13). The present hydraulic control oil circuit for a hydraulic torque converter enables stable control over the pressure for unlocking a hydraulic torque converter, without being affected by the output flow rate of a mechanical oil pump, and enables stable control over the pressure for locking up the hydraulic torque converter, thereby achieving slip and lock-up control of the hydraulic torque converter.

Description

Torque converter hydraulic control oil circuit Technical Field

[0001] The present invention belongs to the technical field of gearboxes, and in particular relates to a hydraulic control oil circuit of a torque converter. Background Art

[0002] In the existing torque converter control oil circuit, when the torque converter is switched between unlocking and locking modes, the locking pressure is not controlled by the pilot solenoid valve and varies greatly. The pilot solenoid valve only adjusts the release pressure, and the slipping process of the torque converter is realized by controlling the difference between the locking pressure and the release pressure. The pressure control accuracy is poor, resulting in poor vehicle driving comfort.

[0003] For example, patent document CN217713545U discloses a control oil circuit for a torque converter, comprising a torque converter, a first regulating valve chamber connected to the torque converter, and a second regulating valve chamber. When the torque converter is locked, oil flows from the first regulating valve chamber to and through the torque converter, and finally to the second regulating valve chamber. When the torque converter is unlocked, oil flows from the second regulating valve chamber to and through the torque converter, and finally to the first regulating valve chamber. The technical solution disclosed in this patent document also fails to solve the technical problem described above.

[0004] Summary of the Invention

[0005] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, the present invention provides a hydraulic control circuit for a torque converter. This circuit utilizes a pilot-operated solenoid valve to simultaneously and stably control both the lockup and release pressures of the torque converter, thereby improving the torque converter's pressure control accuracy, achieving stable torque converter slippage control, and enhancing vehicle driving comfort.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: the hydraulic control oil circuit of the torque converter includes a one-way valve, an unlocking pressure control valve and a pilot solenoid valve, an unlocking control oil circuit is set between the unlocking pressure control valve and the torque converter, the pilot solenoid valve is connected to the unlocking pressure control valve through the pilot valve control oil circuit, the unlocking pressure control valve is connected to the first oil inlet oil circuit, and the unlocking pressure control valve is connected to the one-way valve through the oil drain oil circuit.

[0007] The unlocking pressure control valve includes a first valve body, a first valve core arranged in the first valve body, and a first return spring that applies elastic force to the first valve core. The first valve core is a three-section valve core. The first valve core includes a first left-end core body, a first middle-section core body, and a first right-end core body arranged in sequence along the axial direction. The diameter of the first left-end core body is smaller than the diameters of the first middle-section core body and the first right-end core body, and the diameters of the first middle-section core body and the first right-end core body are the same. After the pressure oil passes between the first left-end core body and the first middle-section core body, the pressure oil pushes the first valve core to move, and the first return spring is compressed.

[0008] The first valve body is provided with a first oil inlet connected to the first oil inlet oil circuit, and a first oil drain port and a second oil drain port connected to the oil drain oil circuit.

[0009] The hydraulic control oil circuit of the torque converter also includes a locking pressure control valve connected to the unlocking pressure control valve. A locking control oil circuit is set between the locking pressure control valve and the torque converter. The pilot solenoid valve is connected to the locking pressure control valve through the pilot valve control oil circuit, and the locking pressure control valve is connected to the first oil inlet circuit and the second oil inlet circuit respectively.

[0010] The locking pressure control valve includes a second valve body, a second valve core arranged in the second valve body and a second return spring that applies elastic force to the second valve core. The second valve core is a four-section valve core. The second valve core includes a second left end core body, a second middle section core body, a third middle section core body and a second right end core body arranged in sequence along the axial direction. The diameter of the second left end core body is smaller than the diameters of the second middle section core body, the third middle section core body and the second right end core body, and the diameters of the second middle section core body, the third middle section core body and the second right end core body are the same. The second return spring is clamped between the second left end core body and the second valve body.

[0011] The second valve body is provided with a second oil outlet connected to the first cooling and lubricating oil circuit, a second oil inlet connected to the first oil inlet circuit, a locking pressure oil inlet and outlet connected to the locking control oil circuit, a second cooling oil outlet connected to the second cooling and lubricating oil circuit, and a third oil inlet connected to the second oil inlet circuit.

[0012] The unlocking pressure control valve and the locking pressure control valve are connected to a first cooling lubricating oil circuit. The unlocking pressure control valve is connected to the locking pressure control valve through a second cooling lubricating oil circuit. The locking pressure control valve is connected to a second oil inlet circuit.

[0013] A first throttle hole is provided between the pilot valve control oil circuit and the locking pressure control valve, and a second throttle hole is provided between the pilot valve control oil circuit and the unlocking pressure control valve.

[0014] The second valve body is provided with a locking pressure oil inlet and outlet connected to the locking control oil circuit, and the second valve body is provided with a second spring chamber for accommodating the second return spring, the second spring chamber is connected to the locking control oil circuit, and a third throttle hole is provided between the second spring chamber and the locking control oil circuit.

[0015] A fifth throttle hole is provided between the first oil inlet circuit and the unlocking pressure control valve, a fourth throttle hole is provided between the first oil inlet circuit and the locking pressure control valve, and a sixth throttle hole is provided between the oil drain circuit and the one-way valve.

[0016] The hydraulic control oil circuit of the torque converter of the present invention has the following beneficial effects:

[0017] (1) The unlocking pressure of the torque converter can be stably controlled without being affected by the output flow of the mechanical oil pump;

[0018] (2) It can stably control the locking pressure of the torque converter and realize the sliding wear and locking control of the torque converter;

[0019] (3) Provide cooling and lubricating oil circuits for the transmission when the torque converter is unlocked or locked;

[0020] (4) Prevent air from entering the oil circuit through a one-way valve to avoid the influence of air on system pressure control. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] This manual includes the following drawings, which show the following contents:

[0022] FIG1 is a schematic structural diagram of the hydraulic control oil circuit of the torque converter of the present invention;

[0023] FIG2 is a schematic structural diagram of an unlocking pressure control valve;

[0024] FIG3 is a schematic structural diagram of a locking pressure control valve;

[0025] FIG4 is another structural schematic diagram of the hydraulic control oil circuit of the torque converter of the present invention;

[0026] Components marked in the diagram are: 1. Torque converter; 2. Unlocking pressure control valve; 3. Locking pressure control valve; 4. Pilot-operated solenoid valve; 5. Check valve; 6. First oil inlet circuit; 7. Second oil inlet circuit; 8. Third oil inlet circuit; 9. First cooling and lubricating oil circuit; 10. Unlocking control circuit; 11. Locking control circuit (TCA); 12. Pilot valve control circuit; 13. Drain circuit; 14. Second cooling and lubricating oil circuit; 15. First throttle orifice; 16. Second throttle orifice; 17. Third throttle orifice; 18. Fourth throttle orifice; 19. Fifth throttle orifice; 20. Sixth throttle orifice; 21. First valve core; 22. First return spring; 23. First control oil chamber of the pilot-operated solenoid valve; 24. First oil inlet. 25. First oil outlet; 26. First oil drain port; 27. First cooling oil outlet; 28. First cooling oil inlet; 29. ​​Second oil drain port; 31. Second valve core; 32. Second return spring; 33. Second spring oil chamber; 34. Third oil drain port; 35. Second oil outlet; 36. Second oil inlet; 37. Third oil inlet; 38. Locking pressure oil inlet and outlet; 39. Second cooling oil outlet; 40. Second control oil chamber.

[0027] Implementation Method

[0028] The following is a further detailed description of the specific implementation methods of the present invention through the description of embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and to facilitate its implementation.

[0029] It should be noted that, in the following embodiments, the "first", "second", "third", "fourth", "fifth" and "sixth" do not represent an absolute distinction in structure and / or function, nor do they represent a sequence of execution, but are merely for the convenience of description.

[0030] As shown in FIG1 , the present invention provides a hydraulic control oil circuit for a torque converter, comprising a torque converter 1, a locking pressure control valve 3 connected to the torque converter 1, an unlocking pressure control valve 2 connected to the torque converter, a pilot solenoid valve 4 connected to both the locking pressure control valve 3 and the unlocking pressure control valve 2 via a pilot valve control oil circuit 12, a one-way valve 5 connected to the unlocking pressure control valve 2, a first oil inlet oil circuit 6 connected to both the locking pressure control valve 3 and the unlocking pressure control valve 2, and a second oil inlet oil circuit 7 connected to the locking pressure control valve 2. Oil circuit 7, a third oil inlet circuit 8 connected to the pilot solenoid valve 4, a first cooling lubricating oil circuit 9 connected to both the locking pressure control valve 3 and the unlocking pressure control valve 2, an unlocking control oil circuit 10 arranged between the torque converter 1 and the unlocking pressure control valve 2, a locking control oil circuit 11 arranged between the torque converter 1 and the locking pressure control valve 3, and an oil drain circuit 13 arranged between the unlocking pressure control valve 2 and the one-way valve 5, the locking pressure control valve 3 and the unlocking pressure control valve 2 are connected via a second cooling lubricating oil circuit 14.

[0031] Specifically, as shown in Figure 2, the unlocking pressure control valve 2 includes a first valve body, a first valve core 21 movably disposed in the first valve body, and a first return spring 22 that applies an elastic force to the first valve core 21. The first valve core 21 is a three-section valve core, comprising a first left core body, a first middle core body, and a first right core body, which are sequentially arranged along the axial direction. The first left core body, the first middle core body, and the first right core body are all cylindrical and coaxially arranged. The diameter of the first left core body is smaller than that of the first middle core body and the first right core body, and the diameters of the first middle core body and the first right core body are the same. The two ends of the first middle core body in the longitudinal direction are fixedly connected to the first left core body and the first right core body respectively by connecting sections. The diameter of the connecting sections is smaller than that of the first left core body, the first middle core body, and the first right core body. A first spring cavity for accommodating a first return spring 22 is provided in the first valve body. The first right end core body is located between the first middle core body and the first return spring 22. The first return spring 22 is clamped between the end face of the first right end core body and the inner wall face of the first valve body. The first return spring 22 is a compression spring.

[0032] As shown in Figures 1 and 2, the first valve body is provided with a first oil inlet 24 connected to the first oil inlet oil circuit 6, a first oil drain port 26 and a second oil drain port 29 connected to the oil drain circuit 13, a first oil outlet 25 connected to the unlocking control oil circuit 10, a first cooling oil outlet 27 connected to the first cooling and lubricating oil circuit 9, and a first cooling oil inlet 28 connected to the second cooling and lubricating oil circuit 14. The first oil inlet 24, the first oil drain port 26, the first cooling oil outlet 27, the first cooling oil inlet 28 and the second oil drain port 29 are arranged in sequence along the axial direction of the first valve body. The first oil inlet 24, the first oil drain port 26, the first cooling oil outlet 27, the first cooling oil inlet 28 and the second oil drain port 29 are located on one side of the first valve core 21, and the first oil outlet 25 is located on the other side of the first valve core 21. A first control oil chamber 23 is defined within the first valve body. The first valve spool 21 is positioned between the first control oil chamber 23 and a first return spring 22. The first return spring 22 applies an elastic force to the first valve spool 21, forcing it to move axially toward the first control oil chamber 23. After the pressurized oil passes between the first left-end core and the first middle core, the difference in end area between the first left-end core and the first middle core generates a thrust for the first valve spool 21 toward the first spring chamber. Simultaneously, oil from the pilot valve control oil passage 12 enters the first control oil chamber 23 of the unlocking pressure control valve, also forcing the first valve spool 21 toward the first spring chamber. Simultaneously, the first return spring 22 applies an elastic force to the first valve spool 21, forcing it to move axially toward the first control oil chamber 23. The balance of these three forces ensures stable control of the torque converter's unlocking pressure.

[0033] As shown in Figures 1 and 2, the first control oil chamber 23 of the unlocking pressure control valve 2 is connected to the pilot valve control oil circuit 12 and is provided with a second throttle hole 16 with a diameter of Φ1.7 mm, the first oil inlet 24 is connected to the first oil inlet circuit 6 and is provided with a fifth throttle hole 19 with a diameter of Φ3.5 mm, the first oil outlet 25 is connected to the unlocking control oil circuit 10, the first oil drain port 26 and the second oil drain port 29 of the unlocking pressure control valve 2 are connected to the one-way valve 5 through the oil drain circuit 13, and a sixth throttle hole 20 with a diameter of Φ7.5 mm is provided, the first cooling oil inlet 28 is connected to the locking pressure control valve 3 through the second cooling lubricating oil circuit 14, and the first cooling oil outlet 27 is connected to the first cooling lubricating oil circuit 9. The second throttle hole 16 is used to stabilize the oil pressure of the first control oil chamber 23, the fifth throttle hole 19 is used to control the oil flow rate and oil pressure stability of the first oil inlet circuit 6 entering the first oil inlet 24, and the sixth throttle hole 20 is used to control the oil pressure flow rate of the oil leakage process of the oil leakage circuit 13.

[0034] When the torque converter 1 is in the unlocked state, the pilot solenoid valve 4 controls the output pressure. After the pressure oil from the pilot solenoid valve 4 enters the unlocking pressure control valve 2, it generates a thrust for the first valve core 21 to move toward the first spring chamber. When the pressure oil from the first oil inlet circuit 6 passes between the first left end core body and the first middle section core body of the first valve core 21, due to the difference in area between the two ends, the pressure oil generates a thrust for the first valve core 21 to move toward the first spring chamber. At the same time, the first return spring 22 applies an elastic force to the first valve core 21 to move it axially toward the first control oil chamber 23. The unlocking pressure of the torque converter 1 is stably controlled by the mutual balance of the above three forces.

[0035] As shown in Figures 1 and 3, the locking pressure control valve 3 includes a second valve body, a second valve core 31 disposed in the second valve body, and a second return spring 32 that applies an elastic force to the second valve core 31. The second valve core 31 is a four-section valve core, comprising a second left end core body, a second middle core body, a third middle core body, and a second right end core body, arranged in sequence along the axial direction. The diameter of the second left end core body is smaller than that of the second middle core body, the third middle core body, and the second right end core body, while the diameters of the second middle core body, the third middle core body, and the second right end core body are the same. The second return spring 32 is sandwiched between the second left end core body and the second valve body. The second left core, the second middle core, the third middle core, and the second right core are all cylindrical and coaxially arranged. The diameter of the second left core is smaller than that of the second middle core, the third middle core, and the second right core, while the diameters of the second middle core, the third middle core, and the second right core are the same. The second middle core's two ends in the longitudinal direction are fixedly connected to one end of the second left core and the third middle core via a connecting section, respectively. The other end of the third middle core is fixedly connected to the second right core via a connecting section. The connecting section has a smaller diameter than that of the second left core, the second middle core, the third middle core, and the second right core. A second spring chamber 33 is provided within the second valve body to accommodate the second return spring 22. The second spring chamber 33 communicates with the latch control oil passage 11. The second left core is located between the second middle core and the second return spring 22. The second return spring 22 is a compression spring sandwiched between the end surface of the second left core and the inner wall of the second valve body.

[0036] As shown in Figures 1 and 3, the second valve body is equipped with a third oil drain port 34, a second oil outlet 35 connected to the first cooling and lubricating oil circuit 9, a second oil inlet 36 connected to the first oil inlet circuit 6, a lockout pressure oil inlet 38 connected to the lockout control oil circuit 11, a second cooling oil outlet 39 connected to the second cooling and lubricating oil circuit 14, and a third oil inlet 37 connected to the second oil inlet circuit 7. The third oil drain port 34, second oil outlet 35, second oil inlet 36, lockout pressure oil inlet 38, and second cooling oil outlet 39 are arranged in sequence along the axial direction of the second valve body. These ports are located on one side of the second valve core 31, while the third oil inlet 37 is located on the other side of the second valve core 31. The third oil drain port 34 is located on the right side of the second spring oil chamber 33 to drain oil leaking from the gaps between the left and right ends of the valve core.

[0037] A second control oil chamber 40 is disposed within the second valve body and communicates with the pilot valve control oil circuit 12. The second valve spool 31 is located between the second control oil chamber 40 and the second return spring 32. The second return spring 32 is configured to apply an elastic force to the second valve spool 31, causing it to move axially toward the second control oil chamber 40. The second return spring applies an elastic force to the second valve spool 31, causing it to move axially toward the second control oil chamber 40. Simultaneously, oil from the locking control oil circuit enters the second spring chamber 33, generating a thrust for the second valve spool 31 to move axially toward the second control oil chamber 40. Similarly, oil from the pilot valve control oil circuit enters the second control oil chamber 40, generating a thrust for the second valve spool 31 to move axially toward the second spring chamber 33. The balance of these three forces controls the position of the second valve spool 31, thereby achieving stable control of the torque converter lockup pressure.

[0038] As shown in Figures 1 and 3, the locking pressure control valve 3 is connected to the torque converter 1 through the locking control oil circuit 11. The locking control oil circuit 11 is connected to the second spring oil chamber 33 and the locking pressure oil inlet and outlet 38 on the left side of the locking pressure control valve 3, and a third throttle hole 17 with a diameter of Φ1.3mm is provided at the front end of the second spring oil chamber 33. The first cooling lubricating oil circuit 9 is connected to the second oil inlet and outlet 35, and the first oil inlet circuit 6 is connected to the second oil inlet and inlet 36 and a fourth throttle hole 17 with a diameter of Φ2.7mm is provided. The throttle hole 18 and the second oil inlet passage 7 are connected to the oil inlet 37 of the second oil inlet passage of the locking pressure control valve. When the second valve core 31 of the locking pressure control valve 3 is at the rightmost position, the oil in the second oil inlet passage 7 cannot pass through the locking pressure control valve 3. The second cooling lubricating oil passage is connected to the cooling oil outlet 39 of the locking pressure control valve. The pilot solenoid valve 4 is connected to the second control oil chamber 40 of the pilot solenoid valve of the locking pressure control valve 3 via the pilot valve control oil passage 12 and is provided with a first throttle hole 15 with a diameter of Φ1.7 mm. The third throttle hole 17 is used to stabilize the oil pressure in the second spring oil chamber 33. The fourth throttle hole 18 is used to control the flow rate and oil pressure of the oil entering the second oil inlet 36 from the first oil inlet passage 6. The first throttle hole 15 is used to stabilize the oil pressure in the second control oil chamber 40.

[0039] As shown in Figure 1, when the torque converter 1 is in the unlocked state, the first return spring 22 of the unlocking pressure control valve 2 is in an extended state, the second return spring 32 of the locking pressure control valve 3 is in an extended state, the first oil outlet 25 is connected to the first oil inlet 24, the locking pressure oil inlet and outlet 38 and the second cooling oil outlet 39 are connected, and the oil in the first oil inlet circuit 6 enters the unlocking pressure control valve 2 and is stably controlled by the output pressure of the pilot solenoid valve 4, the pressure difference generated by the first valve core 21 and the spring force generated by the first return spring 22 to enter the unlocking control oil circuit 10. The pressure oil in the unlocking control oil circuit 10 enters the torque converter 1, and the oil in the torque converter 1 enters the locking pressure control valve 3 through the locking control oil circuit 11, then enters the unlocking pressure control valve 2 through the second cooling lubricating oil circuit 14, and finally enters the first cooling lubricating oil circuit 9.

[0040] As shown in Figure 4, when the torque converter 1 is in the locked state, the second return spring 32 is in a compressed state, the third oil inlet 37 is connected to the locking pressure oil inlet and outlet 38, and the oil in the second oil inlet circuit 7 enters the locking pressure control valve 3. The output pressure of the pilot solenoid valve 4, the spring force generated by the second return spring 32 and the feedback pressure of the locking control oil circuit 11 stably control the oil pressure entering the locking control oil circuit 11. The pressure oil in the locking control oil circuit 11 enters the torque converter 1, thereby realizing the control of the slip and locking of the torque converter 1.

[0041] As shown in Figures 2 and 4, when the torque converter 1 is in the locked state, the first valve core 21 of the unlocking pressure control valve 2 moves toward the first spring chamber, and the first return spring 22 is compressed. Since the first valve core 21 of the unlocking pressure control valve 2 is in the rightmost position, the oil in the first oil inlet circuit 6 cannot pass through the unlocking pressure control valve 2, and the first oil outlet 25 is connected with the first oil drain port 26. The unlocking control oil circuit 10 is connected with the oil drain circuit 13 through the first oil drain port 26 of the unlocking pressure control valve 2, and the second cooling and lubricating oil circuit 14 is connected with the oil drain circuit 13 through the second oil drain port 29 of the unlocking pressure control valve 2. The pressurized oil in the oil drain circuit 13 is discharged through the one-way valve 5. The opening pressure of the one-way valve 5 is 0.1 bar to prevent all the oil in the oil drain circuit 13 and the second cooling and lubricating oil circuit 14 from flowing out into the air.

[0042] As shown in Figures 3 and 4, when the torque converter 1 is in the locked state, the second oil inlet 36 is connected to the second oil inlet outlet 35, and the oil in the first oil inlet circuit 6 enters the locking pressure control valve 3 through the second oil inlet 36, and then enters the first cooling lubricating oil circuit 9 through the second oil inlet outlet 35.

[0043] Therefore, when the torque converter 1 is unlocked, the hydraulic oil flows through the unlocking pressure control valve 2, through the torque converter 1, and finally to the locking pressure control valve 3. The unlocking pressure control valve 2 and the pilot solenoid valve 4 achieve stable control of the unlocking pressure of the torque converter 1. When the torque converter 1 is locked, the hydraulic oil can flow to the torque converter 1 through the locking pressure control valve 3. The locking pressure control valve 3 and the pilot solenoid valve 4 achieve stable control of the locking pressure of the torque converter 1.

[0044] The hydraulic control oil circuit of the torque converter with the above structure has the following advantages:

[0045] (1) Stable control of the torque converter unlocking pressure, which is not affected by the output flow of the mechanical oil pump;

[0046] (2) Stable control of the torque converter locking pressure to achieve slip and lock control of the torque converter;

[0047] (3) Provide cooling and lubricating oil circuits for the transmission when the torque converter is unlocked or locked;

[0048] (4) Prevent air from entering the oil circuit through a one-way valve to avoid the influence of air on system pressure control.

[0049] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any direct application of the above-described concepts and technical solutions to other situations without modification, fall within the scope of protection of the present invention.

Claims

1. The hydraulic control oil circuit of the torque converter is characterized by: It includes a one-way valve, an unlocking pressure control valve and a pilot solenoid valve. An unlocking control oil circuit is set between the unlocking pressure control valve and the torque converter. The pilot solenoid valve is connected with the unlocking pressure control valve through the pilot valve control oil circuit. The unlocking pressure control valve is connected with the first oil inlet circuit. The unlocking pressure control valve is connected with the one-way valve through the oil drain circuit.

2. The hydraulic control oil circuit of the torque converter according to claim 1, characterized in that: The unlocking pressure control valve includes a first valve body, a first valve core arranged in the first valve body, and a first return spring that applies an elastic force to the first valve core. The first valve core is a three-section valve core. The first valve core includes a first left end core body, a first middle section core body and a first right end core body arranged in sequence along the axial direction. The diameter of the first left end core body is smaller than the diameters of the first middle section core body and the first right end core body, and the diameters of the first middle section core body and the first right end core body are the same. After the pressure oil passes between the first left end core body and the first middle section core body, the pressure oil pushes the first valve core to move, and the first return spring is compressed.

3. The hydraulic control oil circuit of the torque converter according to claim 2, characterized in that: The first valve body is provided with a first oil inlet connected to the first oil inlet oil circuit and a first oil drain port and a second oil drain port connected to the oil drain oil circuit.

4. The hydraulic control oil circuit of the torque converter according to any one of claims 1 to 3, characterized in that: It also includes a locking pressure control valve connected to the unlocking pressure control valve, a locking control oil circuit is set between the locking pressure control valve and the torque converter, the pilot solenoid valve is connected to the locking pressure control valve through the pilot valve control oil circuit, and the locking pressure control valve is connected to the first oil inlet circuit and the second oil inlet circuit respectively.

5. The hydraulic control oil circuit of the torque converter according to claim 4, characterized in that: The locking pressure control valve includes a second valve body, a second valve core arranged in the second valve body and a second return spring that applies elastic force to the second valve core. The second valve core is a four-section valve core. The second valve core includes a second left end core body, a second middle section core body, a third middle section core body and a second right end core body arranged in sequence along the axial direction. The diameter of the second left end core body is smaller than the diameters of the second middle section core body, the third middle section core body and the second right end core body, and the diameters of the second middle section core body, the third middle section core body and the second right end core body are the same. The second return spring is clamped between the second left end core body and the second valve body.

6. The hydraulic control oil circuit of the torque converter according to claim 5, characterized in that: The second valve body is provided with a second oil outlet connected to the first cooling and lubricating oil circuit, a second oil inlet connected to the first oil inlet circuit, a locking pressure oil inlet and outlet connected to the locking control oil circuit, a second cooling oil outlet connected to the second cooling and lubricating oil circuit and a third oil inlet connected to the second oil inlet circuit.

7. The hydraulic control oil circuit of the torque converter according to claim 4, characterized in that: The unlocking pressure control valve and the locking pressure control valve are connected to the first cooling lubricating oil circuit, the unlocking pressure control valve is connected to the locking pressure control valve through the second cooling lubricating oil circuit, and the locking pressure control valve is connected to the second oil inlet circuit.

8. The hydraulic control oil circuit of the torque converter according to claim 4, characterized in that: A first throttle hole is arranged between the pilot valve control oil circuit and the locking pressure control valve, and a second throttle hole is arranged between the pilot valve control oil circuit and the unlocking pressure control valve.

9. The hydraulic control oil circuit of the torque converter according to claim 6, characterized in that: The second valve body is provided with a locking pressure oil inlet and outlet connected to the locking control oil circuit, the second valve body is provided with a second spring chamber for accommodating the second return spring, the second spring chamber is connected to the locking control oil circuit, and a third throttling hole is provided between the second spring chamber and the locking control oil circuit.

10. The hydraulic control oil circuit of the torque converter according to claim 4, characterized in that: A fifth throttle hole is arranged between the first oil inlet circuit and the unlocking pressure control valve, a fourth throttle hole is arranged between the first oil inlet circuit and the locking pressure control valve, and a sixth throttle hole is arranged between the oil drain circuit and the one-way valve.

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