Double-pump hydraulic control system of hybrid power automatic transmission

Abstract

The invention discloses a hybrid power automatic transmission double-pump hydraulic control system which comprises an electronic pump, a mechanical oil pump, a first adjusting valve, a second adjusting valve, a third adjusting valve, a fourth adjusting valve, a fifth adjusting valve, a first damping hole, a second damping hole, a first electromagnetic valve and a second electromagnetic valve. An oil outlet of the engine is connected with oil inlets of a fourth regulating valve and a fifth regulating valve, an oil outlet of the fourth regulating valve is communicated with a main pressure control oil way, and an oil outlet of the fifth regulating valve is communicated with a cooling oil way; the problem of transient large-amplitude oil pressure fluctuation of main oil pressure in the process of switching from independent pressure building of the electronic pump to common pressure building of the electronic pump and the mechanical pump is effectively solved, the stability and reliability of a hydraulic system are improved, the risk of clutch slipping is reduced, the performance of the hybrid power automatic transmission is improved, meanwhile, an oil way oil pressure detection function is achieved, and the reliability of the hybrid power automatic transmission is improved. The closing degree of the valve body can be properly controlled, and the stability of an oil way is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of hybrid automatic transmissions, and particularly to a dual-pump hydraulic control system for a hybrid power automatic transmission. Background Art

[0002] Currently, most hydraulic systems of hybrid automatic transmissions use dual pumps as the power source, and the combination structure of an electric pump and a mechanical pump is the most common. The electric pump can be decoupled from the engine or vehicle speed, while the mechanical pump needs to be coupled with the engine speed, the drive motor speed, or the transmission output speed. In actual use, there is a working mode switching process from the electric pump building pressure alone to the electric pump and the mechanical pump building pressure together. During this process, the air in the oil supply circuit of the mechanical pump and the large flow pulsation of the mechanical pump at low speeds will cause a transient large oil pressure fluctuation in the main oil pressure, resulting in a risk of clutch slippage, affecting the normal control of the gearbox and vehicle performance, and moreover, each valve body cannot automatically adjust the opening degree according to the oil circuit pressure.

[0003] Therefore, the existing hybrid automatic transmission technology field needs further improvement. Summary of the Invention

[0004] The purpose of the present invention is to provide a dual-pump hydraulic control system for a hybrid power automatic transmission, which can solve the problem of transient large oil pressure fluctuation in the main oil pressure when switching from the electric pump building pressure alone to the electric pump and the mechanical pump building pressure together, improve the stability and reliability of the hydraulic system of the hybrid power automatic transmission, and control the opening degree of the control valve body.

[0005] To achieve the above purpose, the present invention adopts the following solutions: A dual-pump hydraulic control system for a hybrid power automatic transmission includes an electric pump, a mechanical oil pump, a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve, a fifth regulating valve, a first damping orifice, a second damping orifice, a first solenoid valve, and a second solenoid valve 20; The oil outlet of the electric pump is connected to the oil inlets of the fourth regulating valve and the fifth regulating valve; The oil outlet of the fourth regulating valve leads to the main pressure control oil circuit, and the oil outlet of the fifth regulating valve leads to the cooling oil circuit; The oil outlet of the mechanical oil pump is connected to the oil inlet of the second regulating valve and the second damping orifice; The oil outlet of the second regulating valve is connected to the main oil pressure regulating oil circuit, and the downstream of the second damping orifice is connected to the cooling oil circuit; The oil inlet of the first regulating valve is connected to the main oil pressure regulating circuit, and its oil outlet is respectively connected to the cooling oil circuit and the bypass oil circuit; A plurality of pressure sensors are installed in the oil circuit, the plurality of pressure sensors are communicatively connected to a control module, and the control module is connected to the first solenoid valve, the second solenoid valve 20, the first regulating valve, the second regulating valve, the fourth regulating valve, and the fifth regulating valve.

[0006] Further, the third regulating valve is located between the oil outlet of the mechanical oil pump and the cooling oil circuit. When the mechanical oil pump operates at a low speed, its output flow contains a large amount of gas, has a low pulsation frequency, and the pressure of the cooling oil circuit is lower than that of the main oil circuit. At this time, the third regulating valve enables the output flow of the mechanical oil pump to preferentially enter the cooling oil circuit. When the flow of the mechanical oil pump is sufficient to open the third regulating valve, the gas content of its output flow does not affect the main oil pressure, and the flow pulsation frequency increases, no longer disturbing the stability of the main oil pressure.

[0007] Further, the first regulating valve is a hydraulic valve, and the change in the position of its valve core is jointly affected by the spring force of the built-in spring in the first regulating valve, the oil pressure of the main oil pressure control oil circuit, and the output oil pressure of the first solenoid valve. By changing the output oil pressure of the first solenoid valve, the main oil pressure, the flow rate of the cooling oil circuit, and the flow rate of the bypass oil circuit are controlled, wherein the first solenoid valve is a proportional pressure solenoid valve.

[0008] Further, a hydraulic system is further included, and the hydraulic system further includes a main oil pressure regulating oil circuit, an electronic pump flow control oil circuit, a parking control oil circuit, a clutch pressure control oil circuit, a cooling oil circuit, and a bypass oil circuit.

[0009] Further, the driving form of the mechanical oil pump is coupled with the engine speed, or coupled with the driving motor speed, or coupled with the transmission output speed.

[0010] Further, a plurality of pressure sensors are evenly distributed on the main pressure control oil circuit, the main oil pressure regulating oil circuit, and the cooling oil circuit to ensure that the pressures of each key oil circuit can be comprehensively and accurately detected in real time.

[0011] Further, the mechanical oil pump is rotationally coupled with the engine, the transmission driving motor, or the transmission output shaft by means of a gear or a chain.

[0012] Further, check valves are provided in both the parking control oil circuit and the clutch pressure control oil circuit to prevent the reverse flow of oil.

[0013] Further, the control module adopts a microcontroller, and the microcontroller controls the opening degrees of the first solenoid valve, the second solenoid valve 20, the first regulating valve, the second regulating valve, the fourth regulating valve, and the fifth regulating valve according to the data detected by the pressure sensors.

[0014] Further, an oil temperature sensor is further included. The oil temperature sensor is installed in the oil circulation loop to detect the oil temperature in real time and is communicatively connected to the control module. The control module adjusts the working parameters of each component according to the data of the oil temperature sensor to meet the system operation requirements at different oil temperatures.

[0015] In summary, the beneficial effects of the present invention compared with the prior art are: The present invention solves the deficiencies existing in the field of existing hybrid automatic transmission technologies. Through the structural arrangement of the present invention, the following advantages are achieved. Without increasing costs, the present invention effectively solves the problem of large transient oil pressure fluctuations in the main oil pressure during the process of switching from the electronic pump building pressure alone to the electronic pump and the mechanical pump building pressure together, improves the stability and reliability of the hydraulic system, reduces the risk of clutch slippage, enhances the performance of the hybrid automatic transmission, and at the same time has an oil circuit oil pressure detection function, can appropriately control the closing degree of the valve body, and ensure the stability of the oil circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is one of the schematic diagrams of the system structure of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figure 1 , the present invention provides a dual-pump hydraulic control system for a hybrid automatic transmission, including an electronic pump 1, a mechanical oil pump 2, a first regulating valve 10, a second regulating valve 3, a third regulating valve 30, a fourth regulating valve 40, a fifth regulating valve 50, a first damping hole 11, a second damping hole 22, a first solenoid valve 21, and a second solenoid valve 20; The electronic pump 1 is driven by an independent motor, decoupled from the vehicle speed and the engine speed, and its oil outlet is connected to the oil inlets of the fourth regulating valve 40 and the fifth regulating valve 50. The oil outlet of the fourth regulating valve 40 leads to the main pressure control oil circuit, and the oil outlet of the fifth regulating valve 50 leads to the cooling oil circuit; The fourth regulating valve 40 controls the opening and closing according to the pressure difference between the inlet and outlet ports. When the force generated by the pressure difference between the inlet and outlet ports is greater than the preset value of the spring, it opens to allow the oil to enter the main pressure control oil circuit; the fifth regulating valve 50 is controlled to open and close by the oil pressure at the oil outlet of the second solenoid valve 20 and the spring. When the oil pressure at the oil outlet of the second solenoid valve 20 is greater than the preset value, it opens to allow the oil to enter the cooling oil circuit; The rotational speed of the mechanical oil pump 2 is coupled with the engine, the transmission drive motor, or the transmission output speed. Its oil outlet is connected to the oil inlet of the second regulating valve 3 and the upstream of the second damping hole 22. The oil outlet of the second regulating valve 3 is connected to the main oil pressure regulating oil circuit, and the downstream of the second damping hole 22 is connected to the cooling oil circuit; The oil inlet of the first regulating valve 10 is connected to the main oil pressure regulating circuit, and its oil outlets are respectively connected to the cooling oil circuit and the bypass oil circuit; when the output flow of the mechanical oil pump 2 is greater than the system demand, the excess flow overflows through the first regulating valve 10 and returns to the suction port of the mechanical oil pump 2 through the bypass oil circuit; When the mechanical oil pump 2 is not working, the second damping orifice 22 guides the flow of the cooling oil circuit into the oil supply circuit of the mechanical oil pump 2, reducing the gas content pumped into the hydraulic pipeline when the mechanical oil pump 2 starts; when the rotational speed of the mechanical oil pump 2 is relatively low, it absorbs part of the flow pulsation and reduces the impact on the pressure of the main oil pressure regulating oil circuit; Multiple pressure sensors are installed in the oil circuit for real-time detection of the oil circuit pressure. The multiple pressure sensors are communicatively connected to a control module, and the control module controls the opening degrees of the first solenoid valve 21, the second solenoid valve 20, the first regulating valve 10, the second regulating valve 3, the fourth regulating valve 40, and the fifth regulating valve 50 according to the oil circuit pressure to stabilize the main oil pressure and ensure the stable operation of the system; The dual-pump hydraulic control system of the hybrid automatic transmission of the present invention mainly includes an electric pump 1, a mechanical oil pump 2, a first regulating valve 10, a second regulating valve 3, a third regulating valve 30, a fourth regulating valve 40, a fifth regulating valve 50, a first damping orifice 11, a second damping orifice 22, a first solenoid valve 21, and a second solenoid valve 20.

[0019] The electric pump 1 is driven by an independent motor and is decoupled from the vehicle speed and the engine speed, and its rotational speed can be actively controlled according to the control strategy. The oil outlet of the electric pump 1 is connected to the oil inlets of the fourth regulating valve 40 and the fifth regulating valve 50. The oil outlet of the fourth regulating valve 40 leads to the main pressure control oil circuit and is responsible for establishing and maintaining the main oil pressure; the oil outlet of the fifth regulating valve 50 leads to the cooling oil circuit to provide the oil required for system cooling. The fourth regulating valve 40 controls its opening and closing according to the pressure difference between the oil inlet and outlet. When the force generated by the pressure difference between the oil inlet and outlet is greater than the preset value of the spring, it opens to allow the oil to enter the main pressure control oil circuit; the fifth regulating valve 50 is controlled to open and close by the oil pressure at the oil outlet of the second solenoid valve 20 and the spring. When the oil pressure at the oil outlet of the second solenoid valve 20 is greater than the preset value, it opens to allow the oil to enter the cooling oil circuit.

[0020] The rotational speed of the mechanical oil pump 2 is coupled with the engine, the transmission drive motor, or the transmission output speed. Its oil outlet is connected to the oil inlet of the second regulating valve 3 and the upstream of the second damping orifice 22. The oil outlet of the second regulating valve 3 is connected to the main oil pressure regulating oil circuit and participates in the regulation of the main oil pressure; the downstream of the second damping orifice 22 is connected to the cooling oil circuit.

[0021] The oil inlet of the first regulating valve 10 is connected to the main oil pressure regulating circuit, and its oil outlets are respectively connected to the cooling oil circuit and the bypass oil circuit. When the output flow of the mechanical oil pump 2 is greater than the system demand, the excess flow overflows through the first regulating valve 10 and returns to the suction port of the mechanical oil pump 2 through the bypass oil circuit, reducing the suction load of the mechanical oil pump and simultaneously regulating the main oil pressure.

[0022] When the mechanical oil pump 2 is not working, the second damping orifice 22 guides the flow of the cooling oil circuit into the oil supply circuit of the mechanical oil pump 2, reducing the gas content pumped into the hydraulic pipeline when the mechanical oil pump 2 starts; when the rotational speed of the mechanical oil pump 2 is relatively low, it absorbs part of the flow pulsation and reduces the impact on the pressure of the main oil pressure regulating oil circuit.

[0023] A plurality of pressure sensors are installed in the oil circuit for real-time detection of the oil circuit pressure. These pressure sensors are communicatively connected to a control module, and the control module controls the opening degrees of the first solenoid valve 21, the second solenoid valve 20, the first regulating valve 10, the second regulating valve 3, the fourth regulating valve 40, and the fifth regulating valve 50 according to the oil circuit pressure to stabilize the main oil pressure and ensure the stable operation of the system.

[0024] The electronic pump is independently driven by its motor, decoupled from the vehicle speed and the engine speed, the outlet of the electronic pump is connected to the inlets of the fourth regulating valve and the fifth regulating valve, the outlet of the fourth regulating valve is connected to the main pressure control oil circuit, and the outlet of the fifth regulating valve is connected to the cooling oil circuit; The fourth regulating valve is controlled to open and close by the pressure difference between its inlet and outlet. When the force generated by the pressure difference between the inlet pressure and the outlet pressure is greater than the preset value of the spring, the fourth regulating valve opens, and the oil enters the main pressure control oil circuit; The fifth regulating valve is controlled to open and close by the oil pressure at the outlet of the second solenoid valve 20 and the spring. When the oil pressure at the outlet of the second solenoid valve 20 is greater than the preset value, the fifth regulating valve opens, and the oil enters the cooling oil circuit; The rotational speed of the mechanical oil pump is coupled with the engine speed or the rotational speed of the transmission drive motor or the transmission output speed. The outlet of the mechanical oil pump is connected to the inlet of the second regulating valve and the upstream of the second damping orifice. The outlet of the second regulating valve is connected to the main oil pressure regulating oil circuit, and the downstream of the second damping orifice is connected to the cooling oil circuit; The inlet of the first regulating valve is connected to the main oil pressure regulating circuit, the outlet is connected to the cooling oil circuit, and the outlet is connected to the bypass oil circuit; The cooling flow from the mechanical oil pump in the cooling oil circuit is jointly controlled by the oil pressure of the main pressure regulating oil circuit and the first damping orifice; when the output flow of the mechanical oil pump is greater than the demand of the hydraulic system, the excess flow returns to the suction port of the mechanical oil pump through the bypass oil circuit due to the overflow effect of the first regulating valve; When the mechanical oil pump is not working, the second damping orifice allows the flow in the cooling oil circuit to enter the oil supply circuit of the mechanical oil pump, reducing the gas content pumped into the hydraulic pipeline when the mechanical oil pump starts; when the rotational speed of the mechanical pump is relatively low, it absorbs part of the flow pulsation of the mechanical pump and reduces the impact on the pressure of the main oil pressure regulating oil circuit; Based on the real-time pressure monitoring data of the main oil pressure regulating oil circuit, through the coordinated operation of the first solenoid valve and the second solenoid valve 20, the opening degrees of the first regulating valve, the second regulating valve, the fourth regulating valve and the fifth regulating valve are dynamically adjusted. When it is detected that the main oil pressure is close to the preset fluctuation threshold, the first solenoid valve responds quickly, finely adjusts the spool position of the first regulating valve, optimizes the flow distribution of the bypass oil circuit and the cooling oil circuit, so as to stabilize the main oil pressure; at the same time, the second solenoid valve 20 controls the opening degrees of the second regulating valve and the fifth regulating valve according to the real-time flow demand of the cooling oil circuit and the working state of the mechanical oil pump, ensuring the efficient coordination of the cooling system and the main oil pressure regulating system, and maintaining the stable operation of the system under different working conditions, further reducing the impact on the main oil pressure when the mechanical pump works and switches.

[0025] The third regulating valve is arranged between the oil outlet of the mechanical oil pump and the cooling oil circuit. When the mechanical oil pump intervenes in work and its speed is in the low-speed stage, due to the high gas content and low flow pulsation frequency in the output flow of the mechanical oil pump, and the pressure of the cooling oil circuit is lower than that of the main oil circuit, under the action of the third regulating valve, the output flow of the mechanical oil pump preferentially enters the cooling oil circuit; when the output flow of the mechanical oil pump is sufficient to open the third regulating valve, the gas content in the output flow of the mechanical oil pump is no longer sufficient to affect the main oil pressure, and at this time the flow pulsation frequency of the mechanical oil pump has risen to a relatively high level, which does not affect the stability of the main oil pressure.

[0026] In the present invention, the third regulating valve 30 is located between the oil outlet of the mechanical oil pump 2 and the cooling oil circuit. When the mechanical oil pump 2 works at a low speed, its output flow has a high gas content and a low pulsation frequency, and the pressure of the cooling oil circuit is lower than that of the main oil circuit. At this time, the third regulating valve 30 makes the output flow of the mechanical oil pump 2 preferentially enter the cooling oil circuit. When the flow of the mechanical oil pump 2 is sufficient to open the third regulating valve 30, the gas content of its output flow does not affect the main oil pressure, and the flow pulsation frequency increases and no longer disturbs the stability of the main oil pressure.

[0027] The first regulating valve 10 in the present invention is a hydraulic valve, and the change of its spool position is jointly affected by the spring force of the built-in spring in the first regulating valve 10, the oil pressure of the main oil pressure control oil circuit and the output oil pressure of the first solenoid valve 21. By changing the output oil pressure of the first solenoid valve 21, the main oil pressure, the flow of the cooling oil circuit and the flow of the bypass oil circuit are controlled, wherein the first solenoid valve 21 is a proportional pressure solenoid valve.

[0028] The hydraulic system in the present invention further includes a main oil pressure regulating oil circuit, an electronic pump 1 flow control oil circuit, a parking control oil circuit, a clutch pressure control oil circuit, a cooling oil circuit, and a bypass oil circuit.

[0029] The driving form of the mechanical oil pump 2 in the present invention is coupled with the engine speed, or coupled with the driving motor speed, or coupled with the transmission output speed.

[0030] In the present invention, multiple pressure sensors are evenly distributed on the main pressure control oil circuit, the main oil pressure regulating oil circuit, and the cooling oil circuit to ensure that the pressures of each key oil circuit can be comprehensively and accurately detected in real time.

[0031] The mechanical oil pump 2 of the present invention is rotationally coupled with the engine, the transmission drive motor, or the transmission output shaft by means of a gear or a chain.

[0032] One-way valves are provided in both the parking control oil circuit and the clutch pressure control oil circuit of the present invention to prevent the reverse flow of oil.

[0033] The control module of the present invention uses a microcontroller, and the microcontroller controls the opening degrees of the first solenoid valve 21, the second solenoid valve 20, the first regulating valve 10, the second regulating valve 3, the fourth regulating valve 40, and the fifth regulating valve 50 according to the data detected by the pressure sensors.

[0034] The present invention further includes an oil temperature sensor, which is installed in the oil circulation loop to detect the oil temperature in real time and is communicatively connected to the control module. The control module adjusts the working parameters of each component according to the data of the oil temperature sensor to meet the system operation requirements at different oil temperatures; The regulating valve plays a key role in the main oil pressure regulation. It is a hydraulic valve. The oil inlet is connected to the main oil pressure regulating oil circuit, the oil outlet is connected to the cooling oil circuit, and the oil outlet is connected to the bypass oil circuit. The position of its valve core is jointly affected by the spring force of the built-in spring in the regulating valve, the oil pressure of the main pressure control oil circuit, and the oil pressure output by the solenoid valve. For example, when the driving condition of the vehicle changes and the main oil pressure needs to be adjusted, by changing the oil pressure output by the solenoid valve, the balance state of the regulating valve core is broken, and its valve core position changes. After the valve core position changes, the flow rate flowing into the cooling oil circuit and the flow rate entering the bypass oil circuit change accordingly, thereby realizing the precise regulation of the pressure of the main oil pressure regulating oil circuit. Since the solenoid valve is a proportional pressure solenoid valve, it can accurately output different oil pressures according to the control signal, providing a strong guarantee for the precise regulation of the main oil pressure.

[0035] The oil outlet of the electronic pump is connected to the oil inlets of the fourth regulating valve 40 and the fifth regulating valve 50. The oil outlet of the fourth regulating valve 40 is connected to the main pressure control oil circuit, the oil outlet of the fifth regulating valve 50 is connected to the oil inlet of the second regulating valve 3, and the oil outlet of the second regulating valve 3 is connected to the cooling oil circuit. The fourth regulating valve 40 and the fifth regulating valve 50 are controlled to open and close by the pressure difference between the oil inlet and the oil outlet. In actual operation, when the output pressure of the electronic pump increases, such that the force generated by the pressure difference between the oil inlet and the oil outlet of the fourth regulating valve 40 is greater than the preset value of the spring, the fourth regulating valve 40 opens, and the oil enters the main pressure control oil circuit to provide oil for establishing the main oil pressure. The opening and closing of the fifth regulating valve 50 are controlled by the oil pressure at the oil outlet of the solenoid valve and the spring. When the oil pressure at the oil outlet of the solenoid valve is greater than the preset value, the regulating valve opens, and the oil enters the cooling oil circuit to ensure the normal operation of the cooling system.

[0036] When the mechanical pump is not working, all the flow of the hydraulic system is supplied by the electronic pump. At this time, the output flow of the electronic pump should not only meet the establishment of the main oil pressure of the system, but also meet the demand of the cooling flow. To achieve this goal, the regulating valve needs to be in the closed state, so that all the output flow of the electronic pump enters the main oil pressure regulating oil circuit. By controlling the solenoid valve current, the spool position of the regulating valve is adjusted, and then the main oil circuit oil pressure and the cooling system flow are adjusted. At the same time, the solenoid valve current is controlled so that the output oil pressure of the solenoid valve is less than the opening pressure of the regulating valve to ensure that the regulating valve remains closed. During this process, the oil in the cooling oil circuit enters the oil supply oil circuit of the mechanical pump through the damping hole, discharging the air in the oil supply oil circuit of the mechanical pump, so that the oil supply oil circuit of the mechanical pump is always filled with oil, and the oil pressure is basically consistent with that of the cooling oil circuit. In this way, when the mechanical pump is ready to start working, the gas content in its oil supply oil circuit has been greatly reduced, effectively avoiding the oil pressure fluctuation problem caused by the existence of gas.

[0037] When the mechanical pump intervenes in the work, its speed gradually increases, and the output flow also gradually increases. However, in the low-speed stage, due to the limitations of the self-priming ability and frequency characteristics of the mechanical pump, the gas content in the output flow will be relatively high, and the flow pulsation frequency will be relatively low. These factors will have an adverse impact on the oil pressure. However, due to the existence of the regulating valve and the damping hole, and the pressure of the cooling oil circuit is always lower than that of the main oil circuit, the flow will preferentially enter the cooling oil circuit. As the speed of the mechanical pump increases, when the output flow of the oil pump is sufficient to open the regulating valve, the gas content in the output flow of the oil pump is no longer sufficient to affect the main oil pressure, and at this time, the flow pulsation frequency of the mechanical pump has risen to a relatively high level, which does not affect the stability of the main oil pressure. At the same time, multiple pressure sensors monitor the oil circuit pressure in real time and transmit the data to the control module. The control module accurately controls the opening degrees of the first solenoid valve 21, the second solenoid valve 20, the first regulating valve 10, the second regulating valve 3, the fourth regulating valve 40 and the fifth regulating valve 50 according to these data to ensure the stable operation of the system under different working conditions.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A hybrid automatic transmission dual-pump hydraulic control system, characterized in that: It comprises an electronic pump (1), a mechanical oil pump (2), a first regulating valve (10), a second regulating valve (3), a third regulating valve (30), a fourth regulating valve (40), a fifth regulating valve (50), a first damping hole (11), a second damping hole (22), a first solenoid valve (21), and a second solenoid valve (20); The oil outlet of the electronic pump (1) is connected to the oil inlets of the fourth regulating valve (40) and the fifth regulating valve (50); The oil outlet of the fourth regulating valve (40) leads to the main pressure control oil circuit, and the oil outlet of the fifth regulating valve (50) leads to the cooling oil circuit; The oil outlet of the mechanical oil pump (2) is connected to the oil inlet of the second regulating valve (3) and the second damping hole (22); The oil outlet of the second regulating valve (3) is connected to the main oil pressure regulating oil circuit, and the downstream of the second damping hole (22) is connected to the cooling oil circuit; The oil inlet of the first regulating valve (10) is connected to the main oil pressure regulating circuit, and the oil outlet thereof is respectively connected to the cooling oil circuit and the bypass oil circuit; A plurality of pressure sensors are installed in the oil circuit, the plurality of pressure sensors are communicatively connected to a control module, and the control module is connected to a first solenoid valve (21), a second solenoid valve (20), a first regulating valve (10), a second regulating valve (3), a fourth regulating valve (40) and a fifth regulating valve (50).

2. The hybrid automatic transmission dual-pump hydraulic control system according to claim 1, characterized in that: The third regulating valve (30) is located between the oil outlet of the mechanical oil pump (2) and the cooling oil circuit. When the mechanical oil pump (2) operates at a low speed, its output flow contains more gas and has a low pulsation frequency, and the pressure of the cooling oil circuit is lower than that of the main oil circuit. At this time, the third regulating valve (30) allows the output flow of the mechanical oil pump (2) to enter the cooling oil circuit first. When the flow of the mechanical oil pump (2) is sufficient to open the third regulating valve (30), the gas content of its output flow does not affect the main oil pressure, and the flow pulsation frequency increases, which no longer interferes with the stability of the main oil pressure.

3. The hybrid automatic transmission dual-pump hydraulic control system according to claim 2, characterized in that The first regulating valve (10) is a hydraulic valve, and the change of the valve core position is jointly affected by the spring force of the built-in spring in the first regulating valve (10), the oil pressure of the main oil pressure control oil circuit and the output oil pressure of the first solenoid valve (21). By changing the output oil pressure of the first solenoid valve (21), the main oil pressure, the cooling oil circuit flow and the bypass oil circuit flow are controlled, wherein the first solenoid valve (21) is a proportional pressure solenoid valve.

4. The hybrid automatic transmission dual-pump hydraulic control system according to claim 3, characterized in that: It also includes a hydraulic system, which includes a main oil pressure regulating oil circuit, an electronic pump (1) flow control oil circuit, a parking control oil circuit, a clutch pressure control oil circuit, a cooling oil circuit, and a bypass oil circuit.

5. The hybrid automatic transmission dual-pump hydraulic control system according to claim 4, characterized in that: The driving form of the mechanical oil pump (2) is coupled with the engine speed, or coupled with the drive motor speed, or coupled with the transmission output speed.

6. The hybrid automatic transmission dual-pump hydraulic control system according to claim 5, characterized in that: A plurality of pressure sensors are evenly distributed in the main pressure control oil circuit, the main oil pressure regulating oil circuit and the cooling oil circuit.

7. The hybrid automatic transmission dual-pump hydraulic control system according to claim 6, characterized in that: The mechanical oil pump (2) is speed-coupled with the engine, the transmission drive motor or the transmission output shaft by means of gears or chains.

8. The hybrid automatic transmission dual-pump hydraulic control system according to claim 7, characterized in that: Check valves are provided in the parking control oil circuit and the clutch pressure control oil circuit to prevent oil backflow.

9. The hybrid automatic transmission dual-pump hydraulic control system according to claim 8, characterized in that: The control module adopts a microcontroller, and the microcontroller controls the opening of the first solenoid valve (21), the second solenoid valve (20), the first regulating valve (10), the second regulating valve (3), the fourth regulating valve (40) and the fifth regulating valve (50) according to data detected by the pressure sensor.

10. The hybrid automatic transmission dual-pump hydraulic control system according to claim 8, characterized in that: It also includes an oil temperature sensor, which is installed in the oil circulation loop for real-time detection of the oil temperature and is communicatively connected to the control module. The control module adjusts the working parameters of each component according to the data of the oil temperature sensor to adapt to the system operation requirements under different oil temperatures.

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