A dual-pump hydraulic control system for a hybrid automatic transmission

Abstract

The present invention discloses a dual-pump hydraulic control system for a hybrid automatic transmission, which 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. The electric pump is driven by an independent motor and decoupled from the vehicle speed and the engine speed. Its oil outlet 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. It effectively solves the problem of large transient oil pressure fluctuations in the main oil pressure during the process of switching from the electric pump building pressure alone to the electric 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 the function of detecting the oil pressure of the oil circuit, and can appropriately control the closing degree of the valve body to ensure the stability of the oil circuit.

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 hybrid power automatic transmission hydraulic system, and control the opening degree of the control valve body.

[0005] To achieve the above purpose, the present invention adopts the following solutions:

[0006] 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 hole, a second damping hole, a first solenoid valve, and a second solenoid valve 20;

[0007] The oil outlet of the electric pump is connected to the oil inlets of the fourth regulating valve and the fifth regulating valve;

[0008] 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;

[0009] The oil outlet of the mechanical oil pump is connected to the oil inlet of the second regulating valve and the second damping hole;

[0010] 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 hole is connected to the cooling oil circuit;

[0011] 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;

[0012] Multiple pressure sensors are installed in the oil circuit. The multiple pressure sensors are communicatively connected to a control module, and the control module is connected to a first solenoid valve, a second solenoid valve 20, a first regulating valve, a second regulating valve, a fourth regulating valve, and a fifth regulating valve.

[0013] 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 lot of 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 enables the output flow of the mechanical oil pump to preferentially enter the cooling oil circuit. When the flow rate 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.

[0014] Further, the first regulating valve is a hydraulic valve, and the change in the position of its spool 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, where the first solenoid valve is a proportional pressure solenoid valve.

[0015] 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.

[0016] 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.

[0017] Further, 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.

[0018] Further, the mechanical oil pump is rotationally coupled with the engine, the transmission driving motor, or the transmission output shaft by means of gears or chains.

[0019] 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.

[0020] Further, the control module uses 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.

[0021] Further, it further includes an oil temperature sensor which is installed in the oil circulation circuit, used for detecting 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.

[0022] In summary, the beneficial effects of the present invention compared with the prior art are as follows:

[0023] The present invention solves the deficiencies existing in the prior art in the field of hybrid automatic transmissions. Through the structural settings of the present invention, it has the following advantages. 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 the function of detecting the oil pressure in the oil circuit, can appropriately control the closing degree of the valve body, and ensure the stability of the oil circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is one of the system structure diagrams of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] 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 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.

[0026] 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 orifice 11, a second damping orifice 22, a first solenoid valve 21, and a second solenoid valve 20;

[0027] The electronic pump 1 is driven by an independent motor and is decoupled from the vehicle speed and the engine speed. 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;

[0028] The fourth regulating valve 40 controls its opening and closing according to the pressure difference between the oil inlet and outlet. It opens when the force generated by the pressure difference between the oil inlet and outlet is greater than the preset value of the spring, allowing the oil to enter the main pressure control oil circuit; the fifth regulating valve 50 controls its opening and closing by the oil pressure at the outlet of the second solenoid valve 20 and the spring. It opens when the oil pressure at the outlet of the second solenoid valve 20 is greater than the preset value, enabling the oil to enter the cooling oil circuit;

[0029] The rotational speed of the mechanical oil pump 2 is coupled with the rotational speed of the engine, the transmission drive motor, or the transmission output. 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 the downstream of the second damping orifice 22 is connected to the cooling oil circuit;

[0030] The oil inlet of the first regulating valve 10 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; when the output flow rate of the mechanical oil pump 2 is greater than the system demand, the excess flow rate overflows through the first regulating valve 10 and returns to the oil suction port of the mechanical oil pump 2 through the bypass oil circuit;

[0031] When the mechanical oil pump 2 is not working, the second damping orifice 22 guides the flow rate of the cooling oil circuit into the oil supply oil 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 rate pulsation and reduces the impact on the pressure of the main oil pressure regulating oil circuit;

[0032] Multiple pressure sensors are installed in the oil circuit to detect the oil circuit pressure in real time. 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;

[0033] 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.

[0034] The electronic pump 1 is independently driven by a motor, decoupled from the vehicle speed and engine speed, and its speed can be actively controlled according to the control strategy. The outlet of the electronic pump 1 is connected to the inlets of the fourth regulating valve 40 and the fifth regulating valve 50. The outlet of the fourth regulating valve 40 leads to the main pressure control oil circuit, responsible for establishing and maintaining the main oil pressure; the outlet of the fifth regulating valve 50 leads to the cooling oil circuit, providing the oil required for cooling the system. The fourth regulating valve 40 controls its opening and closing according to the pressure difference between the inlet and outlet. When the force generated by the pressure difference between the 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 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, it opens to allow the oil to enter the cooling oil circuit.

[0035] The speed of the mechanical oil pump 2 is coupled with the engine speed, the transmission drive motor speed, or the transmission output speed. Its outlet is connected to the inlet of the second regulating valve 3 and the upstream of the second damping orifice 22. The outlet of the second regulating valve 3 is connected to the main oil pressure regulating oil circuit, participating in the regulation of the main oil pressure; the downstream of the second damping orifice 22 is connected to the cooling oil circuit.

[0036] The inlet of the first regulating valve 10 is connected to the main oil pressure regulating circuit, and its outlet is 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.

[0037] 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 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.

[0038] Multiple 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.

[0039] The electronic pump is independently driven by its motor, decoupled from the vehicle speed and 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;

[0040] 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 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;

[0041] The fifth regulating valve is controlled by the oil pressure at the oil outlet of the second solenoid valve 20 and a spring to open and close. When the oil pressure at the oil 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.

[0042] The rotation speed of the mechanical oil pump is coupled with the engine speed or the transmission drive motor speed or the transmission output speed. The oil outlet of the mechanical oil pump is connected to the oil inlet of the second regulating valve and upstream of 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.

[0043] The oil inlet of the first regulating valve is connected to the main oil pressure regulating circuit, the oil outlet is connected to the cooling oil circuit, and the oil outlet is also connected to the bypass oil circuit.

[0044] The cooling flow rate 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 rate of the mechanical oil pump is greater than the demand of the hydraulic system, the excess flow rate returns to the oil suction port of the mechanical oil pump through the bypass oil circuit due to the overflow function of the first regulating valve.

[0045] When the mechanical oil pump is not working, the second damping orifice allows the flow rate in the cooling oil circuit to enter the oil supply oil circuit of the mechanical oil pump, reducing the gas content pumped into the hydraulic pipeline when the mechanical oil pump starts. When the rotation speed of the mechanical pump is relatively low, it absorbs part of the flow rate pulsation of the mechanical pump, reducing the impact on the pressure of the main oil pressure regulating oil circuit.

[0046] 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 rate distribution of the bypass oil circuit and the cooling oil circuit 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 rate 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, maintaining the stable operation of the system under different working conditions, and further reducing the impact on the main oil pressure when the mechanical pump working state switches.

[0047] 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 rotation speed is in the low-speed stage, due to the relatively high gas content and low flow rate pulsation frequency in the output flow rate 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 rate of the mechanical oil pump preferentially enters the cooling oil circuit. When the output flow rate of the mechanical oil pump is sufficient to open the third regulating valve, the gas content in the output flow rate of the mechanical oil pump is no longer sufficient to affect the main oil pressure, and at this time, the flow rate 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.

[0048] The third regulating valve 30 of the present invention 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 a lot 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 30 enables the output flow of the mechanical oil pump 2 to preferentially enter the cooling oil circuit. When the flow rate 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, no longer disturbing the stability of the main oil pressure.

[0049] The first regulating valve 10 of the present invention is a hydraulic valve, and the change of the position of its valve core 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 rate of the cooling oil circuit, and the flow rate of the bypass oil circuit are controlled, wherein the first solenoid valve 21 is a proportional pressure solenoid valve.

[0050] The hydraulic system of 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.

[0051] The driving form of the mechanical oil pump 2 of the present invention is coupled with the engine speed, or coupled with the driving motor speed, or coupled with the transmission output speed.

[0052] A plurality of pressure sensors of the present invention 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.

[0053] The mechanical oil pump 2 of the present invention is rotationally coupled with the engine, the transmission driving motor, or the transmission output shaft by means of gears or chains.

[0054] Check 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.

[0055] 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.

[0056] The present invention further 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 meet the system operation requirements at different oil temperatures;

[0057] 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 regulation oil circuit, the oil outlet is connected to the cooling oil circuit, and the oil outlet is also connected to the bypass oil circuit. The position of its spool is jointly affected by the spring force of the built-in spring in the regulating valve, the oil pressure of the main oil 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 spool of the regulating valve is broken, causing its spool position to change. After the spool position changes, the flow rate into the cooling oil circuit and the flow rate into the bypass oil circuit change accordingly, thereby achieving precise regulation of the pressure of the main oil pressure regulation 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.

[0058] The oil outlet of the electric 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, and the oil outlet of the fifth regulating valve 50 is connected to the oil inlet of the second regulating valve 3. The oil outlet of the second regulating valve 3 is connected to the cooling oil circuit. The opening and closing of the fourth regulating valve 40 and the fifth regulating valve 50 are controlled by the pressure difference between the oil inlet and outlet. In actual operation, when the output pressure of the electric pump increases, causing the force generated by the pressure difference between the oil inlet and outlet of the fourth regulating valve 40 to be 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.

[0059] When the mechanical pump is not working, all the flow rate of the hydraulic system is supplied by the electric pump. At this time, the output flow rate of the electric pump should not only meet the establishment of the main oil pressure of the system but also meet the demand for the cooling flow rate. To achieve this goal, the regulating valve needs to be in the closed state, so that all the output flow rate of the electric pump enters the main oil pressure regulation oil circuit. By controlling the solenoid valve current, the spool position of the regulating valve is adjusted, thereby regulating the oil pressure of the main oil circuit and the flow rate of the cooling system. At the same time, control the solenoid valve current so that the oil pressure output by 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 the same as 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 problem of oil pressure fluctuation caused by the presence of gas.

[0060] When the mechanical pump intervenes in the work, its rotation speed gradually increases, and the output flow rate also gradually increases. However, at 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 rate 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 presence of the regulating valve and the damping orifice, and the fact that 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 rotation speed of the mechanical pump increases, when the output flow rate of the oil pump is sufficient to open the regulating valve, the gas content in the output flow rate 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 precisely 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 based on this data to ensure that the system can operate stably under different working conditions.

[0061] 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 dual-pump hydraulic control system for a hybrid automatic transmission, characterized in that, It includes 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 its oil outlet is respectively connected to the cooling oil circuit and the bypass oil circuit; Multiple pressure sensors are installed in the oil circuit. The multiple pressure sensors are communicatively connected to a control module, and the control module is connected to 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); 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 a lot of 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) makes the output flow of the mechanical oil pump (2) preferentially enter the cooling oil circuit. When the flow rate 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 interferes with the stability of the main oil pressure; The first regulating valve (10) is a hydraulic valve. The change of the spool position of the first regulating valve (10) is jointly affected by the spring force of the built-in spring in the first regulating valve (10), the oil pressure of the main 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 rate of the cooling oil circuit, and the flow rate of the bypass oil circuit are controlled, where the first solenoid valve (21) is a proportional pressure solenoid valve; It further includes an oil temperature sensor, which is installed in the oil circulation circuit 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 meet the system operation requirements at different oil temperatures.

2. The dual-pump hydraulic control system for a hybrid automatic transmission according to claim 1, wherein: It further includes a hydraulic system, and the hydraulic system 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.

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

4. The dual-pump hydraulic control system for a hybrid automatic transmission according to claim 3, characterized in that: The 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.

5. The dual-pump hydraulic control system for a hybrid automatic transmission according to claim 4, characterized in that: The mechanical oil pump (2) is rotationally coupled with the engine, the transmission driving motor, or the transmission output shaft by means of gears or chains.

6. The dual-pump hydraulic control system for a hybrid automatic transmission according to claim 5, characterized in that: One-way valves are provided in both the parking control oil circuit and the clutch pressure control oil circuit to prevent the reverse flow of oil.

7. The dual-pump hydraulic control system for a hybrid automatic transmission according to claim 6, characterized in that: The control module uses a microcontroller, which 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 sensor.

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