Energy-saving oil pump system and control method for hybrid transmission

Abstract

The present invention discloses an energy-saving oil pump system for a hybrid power transmission, and discloses a control method for applying the energy-saving oil pump system for a hybrid power transmission. The oil pump system comprises a first pump, a second pump, a third pump, a switching valve, an electromagnetic control valve, a first directional control valve and a second directional control valve. The second pump is connected in parallel with the first pump, the third pump is connected in series with the second pump, the second pump is connected in series with the third pump, and the second pump is connected in parallel with the first pump, thereby forming the oil pump system. According to different working conditions, the first pump, the second pump and the third pump are made to perform different start, stop and reverse actions. A high-pressure and low-flow third pump is introduced to provide clutch pressure building, pressure-maintaining pressure and flow. A low-pressure and high-flow second pump provides cooling and lubrication flow. Since the energy consumption of mechanical pumps such as the second pump and the third pump is reduced during operation, the efficiency of the entire hybrid power transmission is improved, thereby reducing the fuel consumption of the entire vehicle, achieving the effect of energy saving and emission reduction.

Description

Technical Field

[0001] The present invention relates to the technical field of oil pump systems, and in particular to a hybrid power transmission energy-saving oil pump system and a control method. Background Art

[0002] The gearbox plays an important role in power transmission in a car, and the gearbox has an oil pump system.

[0003] The oil pump system accounts for the largest proportion of energy consumption in the efficiency of the gearbox. As the energy-consuming unit of the hybrid gearbox, the oil pump system effectively reduces the energy consumption of this system during the entire operation of the vehicle, which will play a key role in the energy conservation and emission reduction of the vehicle. Therefore, developing an energy-saving oil pump system will be very meaningful for improving the efficiency of the gearbox. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a hybrid power transmission energy-saving oil pump system, which can reduce the power loss of the transmission and improve the efficiency of the transmission.

[0005] The invention also provides a control method for the oil pump system.

[0006] A hybrid transmission energy-saving oil pump system according to an embodiment of the first aspect of the present invention comprises the first pump, the second pump, the third pump, a switching valve, an electromagnetic control valve, a first directional control valve and a second directional control valve, the second pump is connected in parallel with the first pump, the oil inlet of the first pump and the oil inlet of the second pump are both connected to the oil inlet pipe; the third pump is connected in series with the second pump; the switching valve comprises an elastic member, an input port, a first output port and a second output port, the input port is used to connect the oil outlet of the first pump, the first output port is connected to the acting element through the fifth directional control valve, the second output port is respectively connected to the acting element and the cooled and lubricated component, the elastic member is used to drive the valve core of the switching valve to remain on the left side so that the input port is connected to the first output port, and a pilot pipe is connected to the pipeline between the first output port and the acting element, The pilot pipe is connected to the left end of the switching valve, and the pilot pipe is used to drive the valve core of the switching valve to move to the right to control the input port to connect to the second output port; the electromagnetic control valve is transmission-connected to the switching valve, and the electromagnetic control valve is used to drive the valve core of the switching valve to move to the left; one end of the first directional control valve is connected to the oil outlet of the third pump, and the other end of the first directional control valve extends to connect to the electromagnetic control valve, and the pipeline between the first directional control valve and the electromagnetic control valve intersects and connects the pipeline between the fifth directional control valve and the acting element; one end of the second directional control valve is connected to the pipeline between the second pump and the third pump, and the other end of the second directional control valve extends to connect to the cooled and lubricated component, and the pipeline between the second directional control valve and the cooled and lubricated component intersects and connects the pipeline between the second output port and the acting element.

[0007] At least the following beneficial effects are achieved: the second pump of the present invention is connected in series with the third pump, and the second pump is connected in parallel with the first pump, thereby forming the oil pump system. According to different working conditions, the first pump, the second pump and the third pump are enabled to perform different start, stop and reverse actions. The third pump with high pressure and small flow is introduced to provide clutch pressure building, pressure maintaining pressure and flow, and the second pump with low pressure and large flow provides cooling and lubrication flow. Since the energy consumption of mechanical pumps such as the second pump and the third pump is reduced during operation, the efficiency of the entire hybrid transmission is improved, thereby reducing the fuel consumption of the entire vehicle and achieving the effect of energy saving and emission reduction.

[0008] According to some embodiments of the present invention, a third directional control valve and a fourth directional control valve are further included, one end of the third directional control valve is connected to the oil outlet of the third pump, and the other end of the third directional control valve is connected to the oil inlet of the second pump; the fourth directional control valve is connected in parallel with the third directional control valve, and the opening direction of the fourth directional control valve is opposite to the opening direction of the third directional control valve, and the third directional control valve and the fourth directional control valve are set to facilitate oil reflux.

[0009] According to some embodiments of the present invention, the input port is connected to the first output port, so that oil is always output from the first output port.

[0010] According to some embodiments of the present invention, the first pump is an electric pump, the pressure of the second pump is lower than that of the third pump, the flow rate of the second pump is higher than that of the third pump, and the low-pressure high-flow pump and the high-pressure low-flow pump cooperate to achieve reduced energy consumption and improved efficiency.

[0011] According to some embodiments of the present invention, the first directional control valve, the second directional control valve, the third directional control valve, the fourth directional control valve and the fifth directional control valve are one-way valves, hydraulically controlled one-way valves, reversing valves, filling valves or shuttle valves.

[0012] According to some embodiments of the present invention, an oil pan and a filter are further included, wherein the oil pan is used to load oil, one end of the filter is connected to the oil pan, and the other end of the filter is connected to the oil inlet pipe.

[0013] According to some embodiments of the present invention, a pipeline between the second directional control valve and the cooled and lubricated component is provided with a throttling hole, and the throttling hole is used for passing oil.

[0014] According to a second aspect of an embodiment of the present invention, a control method for an oil pump system is provided, which uses the hybrid power transmission energy-saving oil pump system. The method comprises the following steps: When the vehicle starts, the first pump works, and the second pump and the third pump do not work. In the initial state, the valve core of the switching valve is on the left, the input port is connected to the first output port, the input port and the second output port are closed, and the oil is output to the acting element along the first output port. At the same time, the oil passes through the pilot pipe to push the valve core of the switching valve to the right, so that the input port is connected to the second output port, thereby connecting the oil path for cooling and lubrication. At this time, the channels between the input port and the first output port are narrowed but still remain connected. The fifth directional control valve is opened, and the oil output from the first output port enters the acting element through the fifth directional control valve to provide pressure, and the oil output from the second output port enters the cooled and lubricated components and the acting element to provide lubrication and cooling.

[0015] At least the following beneficial effects are achieved: the control method of the oil pump system has all the beneficial effects brought by the above hybrid power transmission energy-saving oil pump system, which will not be repeated here.

[0016] According to a third aspect of an embodiment of the present invention, a control method for an oil pump system is provided, which uses the hybrid power transmission energy-saving oil pump system. The method comprises the following steps: S1, when the vehicle is moving forward and the amount of oil required for cooling and lubrication is not large, the second pump and the third pump are working, the first pump is not working, the second pump sucks oil, a part of the oil enters the cooled and lubricated component through the second directional control valve, and the other part of the oil enters the third pump and enters the active element through the first directional control valve; S2, when the vehicle moves forward and a large amount of oil is required for cooling and lubrication, the first pump, the second pump and the third pump all work, the first pump and the second pump all suck in oil, a part of the oil sucked in by the second pump enters the cooled and lubricated parts and the acting element through the second directional control valve, another part of the oil sucked in by the second pump enters the third pump, and enters the acting element and the electromagnetic control valve through the first directional control valve, the oil sucked in by the first pump pushes the valve core of the switching valve to the right through the pilot pipe, so that the input port is connected to the second output port, thereby connecting the oil path for cooling and lubrication, and at this time, the channels of the input port and the first output port are narrowed but still connected, the fifth directional control valve is opened, the oil output from the first output port enters the acting element through the fifth directional control valve to provide pressure, the oil output from the second output port enters the cooled and lubricated parts and the acting element to provide lubrication and cooling, the first pump and the second pump jointly provide cooling and lubricating oil to the cooled and lubricated parts and the acting element, and the first pump and the third pump jointly provide pressurized and pressure-maintaining oil to the acting element.

[0017] According to a fourth aspect of an embodiment of the present invention, a control method for an oil pump system is provided, which uses the hybrid power transmission energy-saving oil pump system, and the method comprises the following steps: When the vehicle is reversing, the second pump and the third pump reverse, the first pump works, the first directional control valve and the second directional control valve are both pushed up, and at this time the valve core of the switching valve is pushed to the right, so that the input port is connected to the second output port, thereby connecting the oil path for cooling and lubrication, the channel between the input port and the first output port becomes narrower, the fifth directional control valve opens, the oil for providing pressure enters the acting element, and the oil for cooling and lubrication enters the cooled and lubricated components and the acting element. Since the second pump and the third pump reverse, the third directional control valve is pushed open, the oil enters the oil outlet of the third pump, and enters the oil outlet of the second pump through the oil inlet of the third pump, and is finally discharged through the oil inlet of the second pump.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 A schematic diagram of a hybrid transmission energy-saving oil pump system according to an embodiment of the present invention; Figure 2 It is a schematic diagram of a hybrid transmission energy-saving oil pump system according to an embodiment of the present invention in which only the first pump works; Figure 3 It is a schematic diagram of a hybrid transmission energy-saving oil pump system according to an embodiment of the present invention in which only the second pump and the third pump are working; Figure 4 A schematic diagram of a switching process of a switching valve in a hybrid transmission energy-saving oil pump system according to an embodiment of the present invention; Figure 5 It is a structural schematic diagram of the switching process of the switching valve in the energy-saving oil pump system of the hybrid transmission according to an embodiment of the present invention.

[0020] Reference numerals: A first pump 100, an oil pan 100a, and a filter 100b; A second pump 200 and a third pump 300; The switching valve 400, the input port 410, the first output port 420, the second output port 430, the elastic member 440, and the pilot pipe 450; Solenoid control valve 500, first directional control valve 600, second directional control valve 700; A third directional control valve 800a, a fourth directional control valve 800b, and a fifth directional control valve 800c; Active element 900a, cooled and lubricated component 900b, and orifice 900c. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0023] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0024] It should be noted that, in the oil pump system, the hydraulic power of the oil pump P=Δp.q / 60, wherein Δp is the pressure in MPa, q is the flow in lpm, and P is the power in kw; in the third pump 300, the flow q is small, and in the second pump 200, the pressure Δp is small, which can effectively reduce the power of the hydraulic pump system under the condition of the same system pressure and system flow requirements (this case is a system with a mechanical pump and an electric pump in parallel).

[0025] The second pump 200 of the present invention is connected in series with the third pump 300 and in parallel with the first pump 100 to form a high-efficiency oil pump system, which introduces the concept of a high-pressure, low-flow mechanical pump to provide clutch pressure building, pressure maintaining pressure and flow, and a low-pressure, high-flow mechanical pump to provide cooling and lubrication flow. Due to the reduction in energy consumption of the mechanical pump during operation, the efficiency of the entire hybrid transmission is improved, thereby reducing the fuel consumption of the entire vehicle.

[0026] Reference Figures 1 to 5 The present invention discloses a hybrid transmission energy-saving oil pump system, comprising a first pump 100, a second pump 200, a third pump 300, a switching valve 400, an electromagnetic control valve 500, a first directional control valve 600 and a second directional control valve 700. The second pump 200 is connected in parallel with the first pump 100, and the oil inlet of the first pump 100 and the oil inlet of the second pump 200 are both connected to the oil inlet pipe; the third pump 300 is connected in series with the second pump 200; the switching valve 400 comprises an elastic member 440, an input port 410, a first output port 420 and a second output port 430, and the input port 410 is used to connect the first pump 100 and the second pump 200. The first output port 420 is connected to the acting element 900a through the fifth directional control valve 800c, and the second output port 430 is respectively connected to the acting element 900a and the cooled and lubricated component 900b. The elastic member 440 is used to drive the valve core of the switching valve 400 to remain on the left side so that the input port 410 is connected to the first output port 420. A pilot pipe 450 is connected to the pipeline between the first output port 420 and the acting element 900a. The pilot pipe 450 is connected to the left end of the switching valve 400. The pilot pipe 450 is used to drive the valve core of the switching valve 400 to move rightward to control the input port 410 to connect to the second output port 430.

[0027] The electromagnetic control valve 500 is connected to the switching valve 400 in a transmission manner, and the electromagnetic control valve 500 is used to drive the valve core of the switching valve 400 to move to the left; one end of the first directional control valve 600 is connected to the oil outlet of the third pump 300, and the other end of the first directional control valve 600 extends to be connected to the electromagnetic control valve 500, and the pipeline between the first directional control valve 600 and the electromagnetic control valve 500 intersects and connects the pipeline between the fifth directional control valve 800c and the acting element; one end of the second directional control valve 700 is connected to the pipeline between the second pump 200 and the third pump 300, and the other end of the second directional control valve 700 extends to be connected to the cooled and lubricated component 900b, and the pipeline between the second directional control valve 700 and the cooled and lubricated component 900b intersects and connects the pipeline between the second output port 430 and the acting element 900a. It can be understood that the electromagnetic control valve 5 00 is mainly used to control the on-off of the pipeline between the high-pressure oil and the switching valve 400. The high-pressure oil in the electromagnetic control valve 500 comes from the oil output from the first output port 420. Because the pipeline between the fifth directional control valve 800c and the acting element 900a also outputs high-pressure oil, the high-pressure oil will be input into the electromagnetic control valve 500 along the intersection. The high-pressure oil and the low-pressure oil are generated based on the switching valve 400. The first output port 420 outputs high-pressure oil, and the second output port 430 outputs low-pressure oil. When the electromagnetic control valve 500 is opened, the high-pressure oil enters the position on the right side of the valve core of the switching valve 400 and pushes the valve core to move to the left. When the electromagnetic control valve 500 is closed, the high-pressure oil no longer acts on the valve core of the switching valve 400, and the oil flowing through the pilot tube 450 pushes the valve core of the switching valve 400 to move to the right.

[0028] It should be understood that the second pump 200 of the present invention is connected in series with the third pump 300, and the second pump 200 is connected in parallel with the first pump 100, thereby forming the present oil pump system. According to different working conditions, the first pump 100, the second pump 200 and the third pump 300 are made to perform different start, stop and reverse actions. The third pump 300 with high pressure and small flow is introduced to provide clutch pressure building, pressure maintaining pressure and flow, and the second pump 200 with low pressure and large flow provides cooling and lubrication flow. Since the energy consumption of mechanical pumps such as the second pump 200 and the third pump 300 is reduced during operation, the efficiency of the entire hybrid transmission is improved, thereby reducing the fuel consumption of the entire vehicle and achieving the effect of energy saving and emission reduction.

[0029] Reference Figure 1 and Figure 3, also includes a third directional control valve 800a and a fourth directional control valve 800b, one end of the third directional control valve 800a is connected to the oil outlet of the third pump 300, and the other end of the third directional control valve 800a is connected to the oil inlet of the second pump 200; the fourth directional control valve 800b is connected in parallel with the third directional control valve 800a, and the opening direction of the fourth directional control valve 800b is opposite to the opening direction of the third directional control valve 800a. The third directional control valve 800a and the fourth directional control valve 800b are set to facilitate oil reflux. It can be understood that when the vehicle is reversing, the third directional control valve 800a and the fourth directional control valve 800b allow the oil to reflux, which is convenient for supplying the first pump 100.

[0030] Reference Figure 5 , the input port 410 is kept connected with the first output port 420, so that there is always oil output from the first output port 420. There is a gap between the left valve core of the switching valve 400 and the first output port 420. The gap causes the input port 410 to be kept connected with the first output port 420. No matter how the valve core moves, the input port 410 and the first output port 420 remain connected. In the initial state, the input port 410 and the second output port 430 are completely closed, while the input port 410 and the first output port 420 are completely connected. When the valve core moves to the right, although the input port 410 and the first output port 420 are connected, the oil passage becomes narrower. This is to ensure that there is always oil entering the acting element 900a. Of course, the input port 410 and the first output port 420 can also be completely closed after the valve core moves to the right.

[0031] In some embodiments, the first pump 100 is an electric pump, the second pump 200 is a low-pressure and high-flow mechanical pump, and the third pump 300 is a high-pressure and low-flow mechanical pump. The low-pressure and high-flow mechanical pump and the high-pressure and low-flow mechanical pump cooperate to achieve reduced energy consumption and improved efficiency. In the high-pressure and low-flow mechanical pump, the q flow is small, and in the low-pressure and high-flow mechanical pump, the △p pressure is small, which can effectively reduce the power of the hydraulic pump system under the same system pressure and system flow requirements. It can be understood that the pressure of the second pump 200 is lower than that of the third pump 300, and the flow of the second pump 200 is higher than that of the third pump 300.

[0032] In some embodiments, the first directional control valve 600, the second directional control valve 700, the third directional control valve 800a, the fourth directional control valve 800b and the fifth directional control valve 800c are one-way valves, hydraulically controlled one-way valves, reversing valves, filling valves or shuttle valves.

[0033] In some embodiments, an oil pan 100a and a filter 100b are also included. The oil pan 100a is used to load oil. One end of the filter 100b is connected to the oil pan 100a, and the other end of the filter 100b is connected to the oil inlet pipe. It can be understood that the oil pan 100a can also be an oil tank.

[0034] In some embodiments, a pipe between the second directional control valve 700 and the cooled and lubricated component 900 b is provided with a throttle hole 900 c , and the throttle hole 900 c is used to pass oil.

[0035] According to a second aspect of an embodiment of the present invention, a control method for an oil pump system is applied to a hybrid transmission energy-saving oil pump system, and the method comprises the following steps: When the vehicle starts, the first pump 100 works, and the second pump 200 and the third pump 300 do not work. In the initial state, the valve core of the switching valve 400 is at the left side, the input port 410 is connected with the first output port 420, the input port 410 and the second output port 430 are closed, and the oil is output to the acting element 900a along the first output port 420. At the same time, the oil passes through the pilot pipe 450 to push the valve core of the switching valve 400 to the right side, so that the input port 410 is connected with the second output port 430, thereby connecting the oil path for cooling and lubrication. At this time, the channel between the input port 410 and the first output port 420 becomes narrower but still remains connected. The fifth directional control valve 800c is opened, and the oil output from the first output port 420 enters the acting element 900a through the fifth directional control valve 800c to provide pressure, and the oil output from the second output port 430 enters the cooled and lubricated component 900b and the acting element 900a to provide lubrication and cooling.

[0036] At least the following beneficial effects are achieved: the control method of the oil pump system has all the beneficial effects brought by the above hybrid power transmission energy-saving oil pump system, which will not be repeated here.

[0037] According to a control method of an oil pump system of an embodiment of a third aspect of the present invention, a hybrid power transmission energy-saving oil pump system is applied, and the method comprises the following steps: S1, when the vehicle is moving forward and the amount of oil required for cooling and lubrication is not large, the second pump 200 and the third pump 300 are working, the first pump 100 is not working, the second pump 200 sucks the oil, a part of the oil enters the cooled and lubricated component 900b through the second directional control valve 700, and the other part of the oil enters the third pump 300 and enters the active element 900a through the first directional control valve 600; S2, when the vehicle moves forward and a large amount of oil is required for cooling and lubrication, the first pump 100, the second pump 200 and the third pump 300 all work, and the first pump 100 and the second pump 200 both suck in oil. A portion of the oil sucked in by the second pump 200 enters the cooled and lubricated component 900b and the action element 900a through the second directional control valve 700, and another portion of the oil sucked in by the second pump 200 enters the third pump 300, and enters the action element 900a and the electromagnetic control valve 500 through the first directional control valve 600. The oil sucked in by the first pump 100 pushes the valve core of the switching valve 400 to the right through the pilot pipe 450, so that the input port 410 is connected to the second output port 430. , thereby connecting the oil path for cooling and lubrication, and at this time, the channels between the input port 410 and the first output port 420 become narrower but still remain connected, the fifth directional control valve 800c is opened, and the oil output from the first output port 420 enters the active element 900a through the fifth directional control valve 800c to provide pressure, and the oil output from the second output port 430 enters the cooled and lubricated component 900b and the active element 900a to provide lubrication and cooling, the first pump 100 and the second pump 200 jointly provide cooling and lubricating oil to the cooled and lubricated component 900b and the active element 900a, and the first pump 100 and the third pump 300 jointly provide pressurized and pressure-maintaining oil to the active element 900a.

[0038] According to a second aspect of an embodiment of the present invention, a control method for an oil pump system is applied to a hybrid transmission energy-saving oil pump system, and the method comprises the following steps: When the vehicle is reversing, the second pump 200 and the third pump 300 reverse, the first pump 100 works, the first directional control valve 600 and the second directional control valve 700 are both held, and at this time the valve core of the switching valve 400 is pushed to the right, so that the input port 410 is connected to the second output port 430, thereby connecting the oil path for cooling and lubrication, the channel between the input port 410 and the first output port 420 becomes narrower, the fifth directional control valve 800c is opened, the oil for providing pressure enters the active element 900a, and the oil for cooling and lubrication enters the cooled and lubricated component 900b and the active element 900a. Due to the reverse rotation of the second pump 200 and the third pump 300, the third directional control valve 800a is pushed open, and the oil enters the oil outlet of the third pump 300, and enters the oil outlet of the second pump 200 through the oil inlet of the third pump 300, and is finally discharged through the oil inlet of the second pump 200.

[0039] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A hybrid transmission energy-saving oil pump system, characterized in that: include: First Pump (100); A second pump (200) is arranged in parallel and connected to the first pump (100), and an oil inlet of the first pump (100) and an oil inlet of the second pump (200) are both connected to an oil inlet pipe; A third pump (300) is connected in series with the second pump (200); The switching valve (400) comprises an elastic member (440), an input port (410), a first output port (420) and a second output port (430), wherein the input port (410) is used to communicate with the oil outlet of the first pump (100), the first output port (420) is connected to the action element (900a) via a fifth directional control valve (800c), the second output port (430) is respectively connected to the action element (900a) and the cooled lubricated component (900b), and the elastic member (440) is used to The valve core of the switching valve (400) is driven to remain on the left side so that the input port (410) is connected to the first output port (420); a pilot pipe (450) is connected to the pipeline between the first output port (420) and the action element (900a); the pilot pipe (450) is connected to the left end of the switching valve (400); the pilot pipe (450) is used to drive the valve core of the switching valve (400) to move rightward, so as to control the input port (410) to be connected to the second output port (430); An electromagnetic control valve (500) is transmission-connected to the switching valve (400), and the electromagnetic control valve (500) is used to drive the valve core of the switching valve (400) to move leftward; A first directional control valve (600), one end of which is connected to the oil outlet of the third pump (300), the other end of which extends to be connected to the electromagnetic control valve (500), and the pipeline between the first directional control valve (600) and the electromagnetic control valve (500) intersects and connects to the pipeline between the fifth directional control valve (800c) and the acting element (900a); A second directional control valve (700) has one end connected to the pipeline between the second pump (200) and the third pump (300), and the other end of the second directional control valve (700) extends to be connected to the cooled lubricated component (900b), and the pipeline between the second directional control valve (700) and the cooled lubricated component (900b) intersects and connects to the pipeline between the second output port (430) and the action element (900a).

2. The hybrid power transmission energy-saving oil pump system according to claim 1, characterized in that: Also includes: a third directional control valve (800a), one end of which is connected to the oil outlet of the third pump (300), and the other end of which is connected to the oil inlet of the second pump (200); The fourth directional control valve (800b) is connected in parallel with the third directional control valve (800a), and the valve opening direction of the fourth directional control valve (800b) is opposite to the valve opening direction of the third directional control valve (800a).

3. The hybrid power transmission energy-saving oil pump system according to claim 2, characterized in that: The input port (410) is in communication with the first output port (420).

4. The hybrid power transmission energy-saving oil pump system according to claim 3, characterized in that: The first pump (100) is an electric pump, the pressure of the second pump (200) is lower than that of the third pump (300), and the flow rate of the second pump (200) is higher than that of the third pump (300).

5. The hybrid power transmission energy-saving oil pump system according to claim 3, characterized in that: The first directional control valve (600), the second directional control valve (700), the third directional control valve (800a), the fourth directional control valve (800b) and the fifth directional control valve (800c) are one-way valves, hydraulically controlled one-way valves, reversing valves, filling valves or shuttle valves.

6. The hybrid power transmission energy-saving oil pump system according to claim 3, characterized in that: It also includes an oil pan (100a) and a filter (100b), wherein the oil pan (100a) is used to load oil, one end of the filter (100b) is connected to the oil pan (100a), and the other end of the filter (100b) is connected to the oil inlet pipe.

7. The hybrid power transmission energy-saving oil pump system according to claim 3, characterized in that: A throttling hole (900c) is provided in the pipeline between the second directional control valve (700) and the cooled lubricated component (900b), and the throttling hole (900c) is used for passing oil.

8. A method for controlling an oil pump system, characterized in that: The hybrid power transmission energy-saving oil pump system according to any one of claims 3 to 7 is applied, and the method comprises the following steps: When the vehicle starts, the first pump (100) works, the second pump (200) and the third pump (300) do not work, and in the initial state, the valve core of the switching valve (400) is located on the left side, the input port (410) is connected to the first output port (420), the input port (410) and the second output port (430) are closed, and oil is output to the action element (900a) along the first output port (420). At the same time, the oil passes through the pilot pipe (450) to push the valve core of the switching valve (400) to the right side, so that the input port (410) is connected to the first output port (420). 10) connecting the second output port (430) to connect the oil path for cooling and lubrication, and at this time, the channel between the input port (410) and the first output port (420) becomes narrower but still remains connected, the fifth directional control valve (800c) is opened, and the oil output from the first output port (420) enters the action element (900a) through the fifth directional control valve (800c) to provide pressure, and the oil output from the second output port (430) enters the cooled and lubricated component (900b) and the action element (900a) to provide lubrication and cooling.

9. A method for controlling an oil pump system, characterized in that: The hybrid power transmission energy-saving oil pump system according to any one of claims 3 to 7 is applied, and the method comprises the following steps: S1, when the vehicle is moving forward and the amount of oil required for cooling and lubrication is not large, the second pump (200) and the third pump (300) are working, the first pump (100) is not working, the second pump (200) sucks in oil, a portion of the oil enters the cooled and lubricated component (900b) through the second directional control valve (700), and the other portion of the oil enters the third pump (300) and enters the active element (900a) through the first directional control valve (600); S2, when the vehicle moves forward and a large amount of oil is required for cooling and lubrication, the first pump (100), the second pump (200) and the third pump (300) all work, the first pump (100) and the second pump (200) both suck in oil, a portion of the oil sucked in by the second pump (200) enters the cooled and lubricated component (900b) and the actuating element (900a) through the second directional control valve (700), another portion of the oil sucked in by the second pump (200) enters the third pump (300) and enters the actuating element (900a) and the solenoid control valve (500) through the first directional control valve (600), the oil sucked in by the first pump (100) pushes the valve core of the switching valve (400) to the right through the pilot pipe (450), so that the input port (410) is connected to the second output port ( 430), thereby connecting the oil path for cooling and lubrication, and at this time, the channel between the input port (410) and the first output port (420) becomes narrower but still remains connected, the fifth directional control valve (800c) is opened, the oil output from the first output port (420) enters the acting element (900a) through the fifth directional control valve (800c) to provide pressure, the oil output from the second output port (430) enters the cooled and lubricated component (900b) and the acting element (900a) to provide lubrication and cooling, the first pump (100) and the second pump (200) jointly provide cooling and lubricating oil to the cooled and lubricated component (900b) and the acting element (900a), and the first pump (100) and the third pump (300) jointly provide pressurized and pressure-maintaining oil to the acting element (900a).

10. A method for controlling an oil pump system, characterized in that: The hybrid power transmission energy-saving oil pump system according to any one of claims 3 to 7 is applied, and the method comprises the following steps: When the vehicle is reversing, the second pump (200) and the third pump (300) are reversed, the first pump (100) is working, the first directional control valve (600) and the second directional control valve (700) are both held, and at this time, the valve core of the switching valve (400) is pushed to the right, so that the input port (410) is connected to the second output port (430), thereby connecting the oil path for cooling and lubrication, and the channel between the input port (410) and the first output port (420) is narrowed, and the fifth directional control valve (800c) is closed. ) is opened, the oil for providing pressure enters the acting element (900a), and the oil for cooling and lubricating enters the cooled and lubricated component (900b) and the acting element (900a). Due to the reversal of the second pump (200) and the third pump (300), the third directional control valve (800a) is pushed open, and the oil enters the oil outlet of the third pump (300), and enters the oil outlet of the second pump (200) through the oil inlet of the third pump (300), and is finally discharged through the oil inlet of the second pump (200).

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