A lubrication cooling oil circuit, control method and device for a hybrid vehicle transmission

Abstract

The present invention relates to the technical field of transmissions, and in particular to a lubricating and cooling oil circuit, control method and device for a hybrid vehicle transmission, which comprises the following steps: obtaining the oil temperature of the transmission, judging whether the transmission has cooling requirements according to the oil temperature; if yes, controlling the solenoid valve to connect the oil tank with the first oil circuit, and controlling the first oil pump to drive the oil into the first oil circuit to cool and lubricate the transmission; if no, controlling the solenoid valve to connect the oil tank with the second oil circuit, and controlling the first oil pump to drive the oil into the second oil circuit to lubricate the transmission. Since the lubrication and cooling oil circuits are separated according to functional requirements, when the transmission has cooling requirements, the oil is driven to enter the first oil circuit to cool and lubricate the transmission, and when the transmission has no cooling requirements, the oil is driven to enter the second oil circuit to lubricate the transmission, so that the flow of the oil pump can be controlled as needed, the oil pump speed can be reduced, and the purpose of energy saving and noise reduction can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of transmissions, and in particular to a lubrication cooling oil circuit, a control method and a device for a hybrid vehicle transmission. Background Art

[0002] The transmission is a mechanism used to change the speed and torque from the engine. It can change the transmission ratio of the output shaft and the input shaft in a fixed or step-by-step manner. It is also called a gearbox. The clutch used in a hybrid transmission is generally a multi-plate wet clutch. Compared with ordinary AT transmissions, the clutch cooling and lubrication requirements are higher. Not only must the cooling and lubrication be good, but the flow of hydraulic oil must also be accurately controlled to reduce energy loss, save energy and reduce emissions, in order to adapt to the increasingly tightened fuel consumption policy.

[0003] In the related technology, the lubrication and cooling oil circuit of the automatic gear vehicle transmission is integrated on the hydraulic valve body, and the oil volume, reversing to the lubrication position and output cooling are controlled by precise solenoid valves and valve body oil channels. The lubrication and cooling of the hybrid transmission is relatively simplified, with fewer clutches and precision bearings, so there is no need for a precise and complex hydraulic valve body, but it also inherits the hydraulic system principle of the traditional automatic transmission. The oil pump draws oil through the oil pan and then to the corresponding lubrication and cooling position.

[0004] However, the cooling requirements of the hybrid transmission are not high. When cooling is not required, the oil pump draws oil to the corresponding lubrication cooling position, and the flow will be diverted by unnecessary cooling, causing energy consumption caused by excessive oil pump speed and noise problems caused by excessive speed.

[0005] Therefore, it is necessary to propose a lubrication and cooling oil circuit, control method and device for a hybrid vehicle transmission to solve the above problems. Summary of the invention

[0006] The embodiments of the present invention provide a lubrication and cooling oil circuit, control method and device for a hybrid vehicle transmission to solve the problem in the related art that when cooling is not required, the oil pump draws oil to the corresponding lubrication and cooling position, and the flow is diverted for unnecessary cooling, resulting in energy consumption caused by excessive oil pump speed and noise caused by excessive speed.

[0007] In a first aspect, a method for controlling a lubrication cooling oil circuit of a hybrid vehicle transmission is provided, which comprises the following steps: obtaining the oil temperature of the transmission, and judging whether the transmission has a cooling requirement according to the oil temperature; if so, controlling the solenoid valve to connect the oil tank with the first oil circuit, and controlling the first oil pump to drive the oil into the first oil circuit to cool and lubricate the transmission; if not, controlling the solenoid valve to connect the oil tank with the second oil circuit, and controlling the first oil pump to drive the oil into the second oil circuit to lubricate the transmission.

[0008] In some embodiments, determining whether the transmission has a cooling requirement based on the oil temperature includes: if the real-time oil temperature of the transmission is greater than or equal to a first set threshold, determining that the transmission has a cooling requirement; otherwise, determining that the transmission has no cooling requirement.

[0009] In some embodiments, determining whether the transmission has a cooling requirement based on the oil temperature includes: if the oil temperature change value of the transmission is greater than or equal to a second set threshold, determining that the transmission has a cooling requirement, otherwise determining that the transmission has no cooling requirement.

[0010] In some embodiments, controlling the first oil pump to drive oil into the first oil circuit to cool and lubricate the transmission includes: controlling the first oil pump to drive oil into the first oil circuit to cool the transmission; controlling the second oil pump to drive the oil collected after cooling to enter the third oil circuit to lubricate the transmission.

[0011] In a second aspect, a lubrication cooling oil circuit control device for a hybrid vehicle transmission is provided, which includes: a temperature acquisition module, which is used to obtain the oil temperature of the transmission; a judgment module, which is used to judge whether the transmission has a cooling requirement; a first control module, which is used to control the solenoid valve to connect the oil tank with the first oil circuit when the transmission has a cooling requirement, and control the first oil pump to drive the oil into the first oil circuit to cool and lubricate the transmission; when the transmission has no cooling requirement, control the solenoid valve to connect the oil tank with the second oil circuit, and control the first oil pump to drive the oil into the second oil circuit to lubricate the transmission.

[0012] In some embodiments, the judgment module further includes: a first judgment module, which is used to judge whether the real-time oil temperature of the transmission is greater than or equal to a first set threshold value, and if so, it is judged that the transmission has a cooling requirement, otherwise it is judged that the transmission has no cooling requirement.

[0013] In some embodiments, the judgment module further includes: a second judgment module, which is used to judge whether the oil temperature change value of the transmission is greater than or equal to a second set threshold value, and if so, it is judged that the transmission has a cooling requirement, otherwise it is judged that the transmission has no cooling requirement.

[0014] In some embodiments, it also includes: a second control module, controlling the first oil pump to drive the oil into the first oil circuit to cool the transmission, and controlling the second oil pump to drive the oil collected after cooling to enter the third oil circuit to lubricate the transmission.

[0015] In a third aspect, a lubrication and cooling oil circuit of a hybrid vehicle transmission is provided, which includes: an oil tank connected to a first oil pump; a solenoid valve connected to the first oil pump, the solenoid valve having a first oil port and a second oil port, the first oil port being connected to a first oil circuit, the second oil port being connected to a second oil circuit, the first oil circuit being connected to a cooling device of the transmission, and the second oil circuit being connected to a lubrication device of the transmission; a memory for storing a computer program; a processor connected to the transmission, for executing the computer program to implement the steps of any of the methods described.

[0016] In some embodiments, an oil accumulation box is provided below the cooling device, the oil accumulation box is connected to a third oil circuit, a second oil pump is installed on the third oil circuit, and the third oil circuit is connected to the lubrication device.

[0017] The beneficial effects brought about by the technical solution provided by the present invention include:

[0018] The embodiment of the present invention provides a lubrication and cooling oil circuit, control method and device for a hybrid vehicle transmission. Since the lubrication and cooling oil circuits are separated according to functional requirements, when the transmission has a cooling requirement, the oil is driven to enter the first oil circuit to cool and lubricate the transmission. When the transmission has no cooling requirement, the oil is driven to enter the second oil circuit to lubricate the transmission. In this way, the flow rate of the oil pump can be controlled as needed, the speed of the oil pump can be reduced, and the purpose of energy saving and noise reduction can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A flow chart of a lubrication cooling oil circuit control method for a hybrid vehicle transmission provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of a lubrication and cooling oil circuit control device for a hybrid vehicle transmission provided by an embodiment of the present invention;

[0022] Figure 3 A schematic structural diagram of a lubrication and cooling oil circuit of a hybrid vehicle transmission provided in an embodiment of the present invention.

[0023] Numbers in the figure:

[0024] 1. Solenoid valve; 2. Oil tank; 3. First oil circuit; 4. Second oil circuit; 5. First oil pump; 6. Third oil circuit; 7. Cooling device; 8. Lubricating device; 9. Oil accumulation box. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The embodiments of the present invention provide a lubrication and cooling oil circuit, control method and device for a hybrid vehicle transmission, which can solve the problem in the related art that when cooling is not needed, the oil pump draws oil to the corresponding lubrication and cooling position, and the flow is diverted for unnecessary cooling, resulting in energy consumption caused by excessive oil pump speed and noise caused by excessive speed.

[0027] See also Figure 1 As shown, a method for controlling a lubrication cooling oil circuit of a hybrid vehicle transmission provided by an embodiment of the present invention may include the following steps:

[0028] Step S01, obtaining the oil temperature of the transmission, and determining whether the transmission needs cooling according to the oil temperature.

[0029] Specifically, during vehicle driving, the operation of the transmission will generate heat, and the heat generated will be reflected in the change of the transmission oil temperature. Based on the acquired transmission oil temperature, the real-time transmission oil temperature can be obtained, the transmission oil temperature change value can be obtained, and the heat generated by the transmission can also be obtained. The oil temperature can be used to more accurately determine whether the transmission has cooling requirements.

[0030] Step S02, if yes, control the solenoid valve 1 to connect the oil tank 2 with the first oil circuit 3, and control the first oil pump 5 to drive the oil into the first oil circuit 3 to cool and lubricate the transmission;

[0031] Step S03: if not, control the solenoid valve 1 to connect the oil tank 2 with the second oil circuit 4, and control the first oil pump 5 to drive the oil into the second oil circuit 4 to lubricate the transmission.

[0032] In this embodiment, during the driving process of the vehicle, lubrication of the transmission is usually indispensable. The engine oil in the transmission may overheat, which may reduce the performance of the transmission or even cause damage to the transmission. When the transmission has a cooling demand, it needs to be lubricated and cooled. When the transmission has no cooling demand, it needs to be lubricated. By separating the lubrication and cooling oil circuits according to functional requirements, and by using the solenoid valve 1 to control the on and off of the first oil circuit 3 and the second oil circuit 4, the control is flexible. Specifically, one oil port of the solenoid valve 1 is connected to the first oil circuit 3, and the other oil port is connected to the second oil circuit 4. When the transmission has a cooling demand, the oil is driven into the first oil circuit to cool and lubricate the transmission. When the transmission only has a lubrication demand, the oil is driven into the second oil circuit to lubricate the transmission. Therefore, the flow rate of the oil pump can be controlled as needed. Under the premise of ensuring the lubrication flow rate, the energy waste caused by the oil entering the cooling oil circuit when there is no additional cooling demand can be reduced. At the same time, the oil pump speed is also reduced, and the energy consumption caused by the excessive speed of the oil pump and the noise caused by the excessive speed caused by the unnecessary cooling flow are avoided, thereby achieving the purpose of energy saving and noise reduction.

[0033] Further, judging whether the transmission has cooling demand according to the oil temperature may include: if the real-time oil temperature of the transmission is greater than or equal to a first set threshold, judging that the transmission has cooling demand; otherwise, judging that the transmission has no cooling demand.

[0034] In this embodiment, the cooling demand of the hybrid transmission is not high. If the real-time oil temperature of the transmission rises to the first set threshold, which can be 50°C (calibrable according to system matching), the solenoid valve 1 can be controlled to connect its A oil port to the first oil pump 5 and the first oil circuit 3, and the oil lubricates and cools the transmission motor. When the transmission oil temperature is lower than the first set threshold, the solenoid valve 1 can be controlled to connect its B oil port to the first oil pump 5 and the second oil circuit 4, and only lubricate the transmission motor. In general, whether the solenoid valve A oil port or B oil port is connected, the required oil flow is less than or equal to the flow of oil entering the same oil circuit to lubricate and cool the transmission in the related art, and the corresponding oil pump speed is greatly reduced, and the NVH (noise, vibration and comfort) of the whole vehicle is also greatly improved. Whether the transmission has a cooling demand is determined by whether the real-time oil temperature of the transmission is greater than or equal to the first set threshold. The judgment of the transmission cooling demand can be more accurate. When the transmission oil temperature is too high, the transmission can be cooled in time.

[0035] Further, judging whether the transmission has cooling demand according to the oil temperature may include: if the oil temperature change value of the transmission is greater than or equal to a second set threshold, judging that the transmission has cooling demand; otherwise, judging that the transmission has no cooling demand.

[0036] In this embodiment, under normal driving conditions, the oil temperature change trend of the transmission is relatively gentle, and whether the transmission needs cooling can be judged by whether the real-time oil temperature of the transmission is greater than or equal to the first set threshold. Under special or intense driving conditions, the oil temperature change trend of the transmission is relatively rapid, and whether the transmission needs cooling can be judged not only by the real-time oil temperature of the transmission, but also by whether the oil temperature change value of the transmission is greater than or equal to the second set threshold. That is to say, even if the real-time oil temperature of the transmission has not reached the first set threshold, but the oil temperature change value of the transmission has reached the second set threshold, it can also be judged that the transmission needs cooling. The transmission needs cooling, and the vehicle is in an intense driving condition at this time. Conversely, if the oil temperature change value of the transmission does not reach the second set threshold, but the real-time oil temperature of the transmission has reached the first set threshold, it can also be determined that the transmission needs cooling. At this time, the vehicle is in a peaceful driving condition. Of course, if the real-time oil temperature of the transmission has reached the first set threshold, and the oil temperature change value of the transmission has also reached the second set threshold, it can also be determined that the transmission needs cooling, making the judgment of the transmission cooling demand more accurate. When the transmission needs cooling, the transmission can be cooled more promptly to prevent the transmission from overheating, thereby extending the service life of the transmission.

[0037] Specifically, under special intense driving conditions, such as when the real-time oil temperature of the driving transmission does not reach the first set threshold, but the oil temperature change value of the transmission rises to the second set threshold, the second set threshold can be calibrated according to the system matching, and the solenoid valve 1 can be controlled to connect its A oil port to the first oil pump 5 and the first oil circuit 3, and the oil lubricates and cools the transmission motor. When the oil temperature change value of the transmission is lower than the second set threshold, the solenoid valve 1 can be controlled to connect its B oil port to the first oil pump 5 and the second oil circuit 4, and only lubricates the transmission motor. In general, regardless of whether the solenoid valve A oil port or B oil port is connected, the required oil flow is less than or equal to the flow of oil entering the same oil circuit to lubricate and cool the transmission in the related technology, and the corresponding oil pump speed is greatly reduced, which can also improve the noise and vibration problems of the whole vehicle and improve comfort.

[0038] Furthermore, controlling the first oil pump 5 to drive oil into the first oil circuit 3 to cool and lubricate the transmission may include: controlling the first oil pump 5 to drive oil into the first oil circuit 3 to cool the transmission; controlling the second oil pump to drive the oil collected after cooling to enter the third oil circuit 6 to lubricate the transmission.

[0039] In this embodiment, when the transmission needs cooling, the solenoid valve 1 is controlled to connect the oil tank 2 with the first oil circuit 3, and the first oil pump 5 is controlled to drive the oil into the first oil circuit 3 to spray cool the transmission. After the cooled oil is collected, the second oil pump is controlled to drive the collected oil into the third oil circuit 6 to lubricate the transmission, thereby reducing additional energy loss. Compared with the method in the related art in which the oil pump sucks oil to the corresponding lubrication and cooling positions and allocates a portion of the flow oil to the lubrication and cooling positions respectively, this scheme can reduce the amount of oil used by collecting and reusing the oil, and the corresponding oil pump speed is also greatly reduced, which can improve the noise and vibration problems of the entire vehicle and improve comfort.

[0040] See also Figure 2 As shown, a lubrication cooling oil circuit control device for a hybrid vehicle transmission provided by an embodiment of the present invention may include: a temperature acquisition module 100, which is used to acquire the oil temperature of the transmission; a judgment module 200, which is used to judge whether the transmission has a cooling demand; a first control module 300, which is used to control the solenoid valve 1 to connect the oil tank 2 with the first oil circuit 3 when the transmission has a cooling demand, and control the first oil pump 5 to drive the oil into the first oil circuit 3 to cool and lubricate the transmission; when the transmission has no cooling demand, control the solenoid valve 1 to connect the oil tank 2 with the second oil circuit 4, and control the first oil pump 5 to drive the oil into the second oil circuit 4 to lubricate the transmission. The control device can also implement any embodiment of the lubrication cooling oil circuit control method for the hybrid vehicle transmission described above.

[0041] Furthermore, the judgment module may also include: a first judgment module, which is used to judge whether the real-time oil temperature of the transmission is greater than or equal to a first set threshold value, and if so, it is determined that the transmission has a cooling requirement, otherwise it is determined that the transmission has no cooling requirement.

[0042] In this embodiment, the heat generated by the transmission will be fed back to the oil temperature. The heat is related to factors such as the output torque, speed and time of the transmission motor. The TCU monitors the information on the CAN and calculates the real-time oil temperature of the transmission in a timely manner, so that the on-off time of the solenoid valve A / B oil port can be determined according to the real-time oil temperature using the TCU strategy. Specifically, the calculation method is:

[0043] Q=T*N*(1-η) / 9550*dt

[0044] Where, Q is the heat generated by the power loss (J); T is the motor output torque (Nm); N is the motor speed (rpm); dt is the change in time (s); η is the efficiency (%);

[0045] Δt=Q / (cm)

[0046] Where, Δt is the change in transmission oil temperature during the time dt (℃); c is the specific heat capacity J / (kg·℃); m is the mass of the transmission oil (kg);

[0047] When absorbing heat, Δt=t-t0, where t is the final temperature and t0 is the initial temperature, so the real-time oil temperature of the transmission can be calculated. The first judgment module determines whether the real-time oil temperature of the transmission is greater than or equal to the first set threshold to determine whether the transmission has cooling requirements. The judgment on the cooling requirements of the transmission is more accurate. When it is determined that the transmission has cooling requirements, the transmission is cooled, the required oil flow rate is reduced, and the corresponding oil pump speed can be reduced. It can also improve the noise and vibration problems of the vehicle and improve comfort. When the transmission oil temperature is too high, the transmission can be cooled in time.

[0048] Furthermore, the judgment module may also include: a second judgment module, which is used to judge whether the oil temperature change value of the transmission is greater than or equal to a second set threshold value. If so, it is determined that the transmission has a cooling requirement, otherwise it is determined that the transmission has no cooling requirement.

[0049] In this embodiment, under special intense driving conditions, the temperature rise rate of the transmission can be predicted by the TCU, or the information on the CAN can be monitored by the TCU and the oil temperature change value of the transmission can be calculated in time, so that the on-off time of the solenoid valve A / B oil port can be determined according to the temperature rise rate or the oil temperature change value by using the TCU strategy. Specifically, the oil temperature change value of the transmission within a period of time can be calculated according to the above formula, and the second judgment module can be used to judge whether the oil temperature change value of the transmission is greater than or equal to the second set threshold value to determine whether the transmission has a cooling requirement. When it is determined that the transmission has a cooling requirement, the transmission is cooled, the required oil flow rate is reduced, and the corresponding oil pump speed can be reduced. The noise and vibration problems of the whole vehicle can also be improved, and the comfort is improved. The judgment on the cooling requirement of the transmission is more accurate. When the transmission oil temperature is too high, the transmission can be cooled in time.

[0050] Furthermore, the lubrication and cooling oil circuit control device of the hybrid vehicle transmission may also include: a second control module 400, which controls the first oil pump 5 to drive the oil into the first oil circuit 3 to cool the transmission, and controls the second oil pump to drive the oil collected after cooling to enter the third oil circuit 6 to lubricate the transmission.

[0051] In this embodiment, when the transmission needs cooling, the solenoid valve 1 is controlled by the second control module to connect the oil tank 2 with the first oil circuit 3, and the first oil pump 5 is controlled to drive the oil into the first oil circuit 3 to spray cool the transmission. After the cooled oil is collected, the second oil pump is controlled to drive the collected oil into the third oil circuit 6 to lubricate the transmission, thereby reducing additional energy loss, reducing the amount of oil used, and the corresponding oil pump speed is greatly reduced.

[0052] See also Figure 3 As shown, a lubrication and cooling oil circuit of a hybrid vehicle transmission provided by an embodiment of the present invention may include: an oil tank 2, which is connected to a first oil pump 5; a solenoid valve 1, which is connected to the first oil pump 5, the solenoid valve 1 has a first oil port and a second oil port, the first oil port is connected to a first oil circuit 3, the second oil port is connected to a second oil circuit 4, the first oil circuit 3 is connected to a cooling device 7 of the transmission, and the second oil circuit 4 is connected to a lubrication device 8 of the transmission; a memory, which is used to store a computer program; a processor, which is connected to the transmission, and is used to execute the computer program to implement any step of the lubrication and cooling oil circuit control method of the hybrid vehicle transmission.

[0053] In this embodiment, the first oil pump 5 uses an electric pump to replace the original mechanical pump, and the oil pump speed can be controlled as needed. The control is flexible, simple and light, and meets the use requirements. When there is a cooling demand, the first oil circuit 3 is connected, and when there is no cooling demand, the second oil circuit 4 is connected, avoiding unnecessary cooling flow caused by excessive oil pump speed. Energy consumption and noise problems caused by noise.

[0054] Furthermore, an oil accumulation box 9 is provided below the cooling device 7 , the oil accumulation box 9 is connected to the third oil circuit 6 , a second oil pump is installed on the third oil circuit 6 , and the third oil circuit 6 is connected to the lubrication device 8 .

[0055] In this embodiment, the oil that has been sprayed by the cooling device 7 to cool the motor is collected by the oil accumulation box 9 and then driven by the second oil pump to lubricate the bearings without any additional energy loss, thereby achieving the purpose of energy saving and noise reduction.

[0056] The principles of a lubrication cooling oil circuit, control method and device for a hybrid vehicle transmission provided by an embodiment of the present invention are as follows:

[0057] By separating the lubrication and cooling oil circuits according to functional requirements, adding solenoid valves to the traditional oil filter, oil pump, and radiator, the TCU controls the on-and-off of the lubrication and cooling oil circuits according to the cooling requirements of the transmission, and gives the oil pump a target speed through calculation, controls the oil pump flow on demand to meet the purpose of lubrication and cooling, optimizes the oil pump noise problem caused by the traditional solution, and has a good energy-saving effect.

[0058] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0059] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0060] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for controlling the lubrication and cooling oil circuit of a hybrid vehicle transmission, characterized in that: It includes the following steps: Acquiring the oil temperature of the transmission, and determining whether the transmission needs cooling according to the oil temperature; If yes, the solenoid valve (1) is controlled to connect the oil tank (2) with the first oil circuit (3), and the first oil pump (5) is controlled to drive oil into the first oil circuit (3) to cool and lubricate the transmission; controlling the first oil pump (5) to drive oil into the first oil circuit (3) to cool the transmission; Controlling the second oil pump to drive the oil collected after cooling to enter the third oil circuit (6) to lubricate the transmission; If not, the solenoid valve (1) is controlled to connect the oil tank (2) with the second oil circuit (4), and the first oil pump (5) is controlled to drive oil into the second oil circuit (4) to lubricate the transmission.

2. The lubrication and cooling oil circuit control method for a hybrid vehicle transmission as claimed in claim 1, characterized in that: The determining whether the transmission has cooling requirements according to the oil temperature includes: If the real-time oil temperature of the transmission is greater than or equal to a first set threshold, it is determined that the transmission has a cooling requirement, otherwise it is determined that the transmission has no cooling requirement.

3. The lubrication and cooling oil circuit control method for a hybrid vehicle transmission as claimed in claim 1, characterized in that: The determining whether the transmission has cooling requirements according to the oil temperature includes: If the oil temperature change value of the transmission is greater than or equal to a second set threshold, it is determined that the transmission has a cooling requirement, otherwise it is determined that the transmission has no cooling requirement.

4. A lubrication and cooling oil circuit control device for a hybrid vehicle transmission, characterized in that: It includes: A temperature acquisition module, which is used to obtain the oil temperature of the transmission; A determination module, used to determine whether the transmission has a cooling requirement; A first control module, which is used to control the solenoid valve (1) to connect the oil tank (2) with the first oil circuit (3) when the transmission has a cooling demand, and to control the first oil pump (5) to drive oil into the first oil circuit (3) to cool and lubricate the transmission; a second control module, controlling the first oil pump (5) to drive oil to enter the first oil circuit (3) to cool the transmission, and controlling the second oil pump to drive the oil collected after cooling to enter the third oil circuit (6) to lubricate the transmission; When the transmission has no cooling requirement, the solenoid valve (1) is controlled to connect the oil tank (2) with the second oil circuit (4), and the first oil pump (5) is controlled to drive oil into the second oil circuit (4) to lubricate the transmission.

5. The lubrication and cooling oil circuit control device for a hybrid vehicle transmission as claimed in claim 4, characterized in that: It includes, the judging module also includes: The first determination module is used to determine whether the real-time oil temperature of the transmission is greater than or equal to a first set threshold value. If so, it is determined that the transmission has a cooling requirement, otherwise it is determined that the transmission has no cooling requirement.

6. The lubrication and cooling oil circuit control device for a hybrid vehicle transmission as claimed in claim 5, characterized in that: It includes, the judging module also includes: The second determination module is used to determine whether the oil temperature change value of the transmission is greater than or equal to a second set threshold value. If so, it is determined that the transmission has a cooling requirement, otherwise it is determined that the transmission has no cooling requirement.

7. A lubrication and cooling oil circuit of a hybrid vehicle transmission, characterized in that: It includes: An oil tank (2) connected to a first oil pump (5); A solenoid valve (1) connected to the first oil pump (5), the solenoid valve (1) having a first oil port and a second oil port, the first oil port being connected to a first oil circuit (3), the second oil port being connected to a second oil circuit (4), the first oil circuit (3) being connected to a cooling device (7) of a transmission, and the second oil circuit (4) being connected to a lubrication device (8) of the transmission; An oil accumulation box (9) is provided below the cooling device (7), the oil accumulation box (9) is connected to the third oil circuit (6), a second oil pump is installed on the third oil circuit (6), and the third oil circuit (6) is connected to the lubrication device (8); A memory for storing computer programs; A processor connected to the transmission, configured to execute the computer program to implement the steps of the method according to any one of claims 1 to 3.

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