Control method of hybrid gearbox cooling system and hybrid gearbox cooling system

Abstract

The invention discloses a control method of a hybrid gearbox cooling system and the hybrid gearbox cooling system.The cooling system comprises an oil storage part, a to-be-cooled assembly and an oil cooler which form a loop, and the oil storage part and the to-be-cooled assembly are communicated through a first channel and a second channel; the first passage is provided with a first oil pump driven by a vehicle engine, the second passage is provided with a second oil pump driven by an oil pump motor, and the control method comprises the steps that the working state of the first oil pump is obtained; under the condition that the first oil pump is located at the working station, the actual hydraulic value P < actual > of the cooling system is obtained, and the required hydraulic value P < required > meeting the cooling requirement of the cooling system is obtained; and when the difference value between the actual hydraulic value P and the required hydraulic value P is within a first threshold range, the oil pump motor is controlled to be located at a first station, and the oil pump motor stops rotating at the first station.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a control method for a hybrid transmission cooling system and a hybrid transmission cooling system. Background Art

[0002] In the hybrid gearbox, the cooling system is provided with a first oil pump and a second oil pump at the same time. The first oil pump and the second oil pump are used to increase the pressure of the oil and pump it into the component to be cooled.

[0003] In a conventional cooling system, a one-way valve is provided between the second oil pump and the component to be cooled. However, the provision of the one-way valve will lead to flow attenuation and low pumping efficiency. At the same time, under normal circumstances, the working time of the second oil pump is much longer than that of the first oil pump. Thus, the impact of the one-way valve of the second oil pump is particularly prominent.

[0004] In view of this, there is an urgent need to provide a technical solution that can avoid the problems of flow attenuation and reduced oil pumping efficiency caused by the provision of a one-way valve in the second oil pump. Summary of the invention

[0005] An object of the present invention is to provide a control method for a hybrid transmission cooling system and a new technical solution for a hybrid transmission cooling system. By improving the control method, the problems of flow attenuation and reduced pumping efficiency of the second oil pump due to the provision of a one-way valve can be avoided.

[0006] In one aspect of the present invention, a control method for a hybrid transmission cooling system is provided, wherein the cooling system comprises an oil storage member, a component to be cooled, and an oil cooler constituting a circuit, the oil storage member and the component to be cooled are connected via a first passage and a second passage, the first passage is provided with a first oil pump driven by a vehicle engine, and the second passage is provided with a second oil pump driven by an oil pump motor;

[0007] The control method comprises:

[0008] Obtaining the working status of the first oil pump;

[0009] When the first oil pump is in the working position, the actual hydraulic pressure value P of the cooling system is obtained. 实， And obtain the required hydraulic pressure value P that meets the cooling needs of the cooling system 需 ;

[0010] When the actual hydraulic pressure value P 实 and the required hydraulic pressure value P 需 When the difference is within a first threshold range, the oil pump motor is controlled to be in a first working position, and the oil pump motor stops rotating in the first working position.

[0011] By adopting the technical solution in this application, when the actual hydraulic pressure value P 实 and the required hydraulic pressure value P 需 When the difference is within the first threshold range, the oil pump motor is controlled to stop rotating, so that the oil inlet and the oil outlet of the second oil pump are disconnected. In this way, even if the second oil pump is directly connected to the component to be cooled, oil backflow can be prevented, so it is possible to avoid setting a one-way valve between the second oil pump and the component to be cooled, thereby avoiding the problem of flow attenuation and reduced oil pumping efficiency caused by setting a one-way valve between the second oil pump and the component to be cooled.

[0012] Optionally, the oil pump motor is electrically connected to the power supply of the vehicle through a MOS tube, the oil pump motor includes a multi-phase motor winding, the MOS tube includes a plurality of bridges, and each bridge is connected to each phase of the motor winding in a one-to-one correspondence;

[0013] The step of controlling the oil pump motor to be in the first working position includes:

[0014] Any one of the bridges of the MOS tubes is controlled to be connected, and the other bridges are controlled to be closed.

[0015] Optionally, the control method further includes:

[0016] At the actual hydraulic pressure value P 实 Less than the required hydraulic pressure value P 需 In this case, the oil pump motor is controlled to be in the second working position, and the oil pump motor drives the second oil pump to pump oil for the component to be cooled.

[0017] Optionally, in the step of controlling the oil pump motor to be in the second working position, the step further includes:

[0018] Get the speed value of the vehicle engine;

[0019] The actual hydraulic pressure value P of the first oil pump is obtained according to the rotation speed value 实 The actual contribution value P1;

[0020] According to the actual contribution value P1 of the first oil pump and the required hydraulic pressure value P 需 The difference controls the speed of the oil pump motor.

[0021] Optionally, the control method further includes:

[0022] At the actual hydraulic pressure value P 实 Greater than the required hydraulic pressure value P 需 When the rotation speed of the vehicle engine is greater than the second threshold, the oil pump motor is controlled to be in a third position, and in the third position, the second oil pump drives the oil pump motor to generate electricity.

[0023] Optionally, the cooling system comprises a MOS tube, a first electrical connection channel and a second electrical connection channel, and the power supply of the vehicle is electrically connected to the MOS tube through the first electrical connection channel and the second electrical connection channel respectively;

[0024] When the oil pump motor is in the second working position, the second electrical connection channel is controlled to be opened and the first electrical connection channel is closed, so that the power supply of the vehicle supplies power to the oil pump motor through the second electrical connection channel;

[0025] When the oil pump motor is in the third working position, the first electrical connection channel is controlled to be opened, and the second electrical connection channel is controlled to be closed, so that the oil pump motor supplies power to the vehicle through the first electrical connection channel.

[0026] In another aspect of the present application, a hybrid transmission cooling system is provided, the cooling system comprising an oil storage member, a component to be cooled, an oil cooler and a controller constituting a circuit, the oil storage member and the component to be cooled being connected via a first passage and a second passage, the first passage being provided with a first oil pump driven by a vehicle engine, the second passage being provided with a second oil pump driven by an oil pump motor;

[0027] The controller obtains the working information of the first oil pump, the actual hydraulic value P of the cooling system 实 and the required hydraulic pressure value P to meet the cooling needs of the cooling system 需 ;

[0028] When the actual hydraulic pressure value P 实 and the required hydraulic pressure value P 需 When the difference is within a first threshold range, the controller controls the oil pump motor to be in a first working position, and in the first working position, the oil pump motor stops rotating.

[0029] Optionally, the oil pump motor is electrically connected to a power source of the vehicle, and the oil pump motor comprises a multi-phase motor winding;

[0030] The cooling system further comprises a MOS tube connected to a power source of the vehicle, the MOS tube comprises a plurality of bridges, the bridges are connected to each phase of the motor winding in a one-to-one correspondence, and the MOS tube is connected to the controller signal;

[0031] The controller controls any one of the bridges of the MOS tubes to be connected, and controls the other bridges to be closed.

[0032] Optionally, in the actual hydraulic pressure value P 实 Less than the required hydraulic pressure value P 需In the case of , the controller controls the oil pump motor to be in the second working position, and the oil pump motor drives the second oil pump to pump oil for the component to be cooled;

[0033] At the actual hydraulic pressure value P 实 Greater than the required hydraulic pressure value P 需 When the rotation speed of the vehicle engine is greater than the second threshold, the controller controls the oil pump motor to be in a third position, and in the third position, the second oil pump drives the oil pump motor to generate electricity.

[0034] Optionally, the cooling system comprises a first electrical connection channel and a second electrical connection channel, and the power supply of the vehicle is electrically connected to the MOS tube through the first electrical connection channel and the second electrical connection channel respectively;

[0035] The first electrical connection channel includes a first switch and a processing circuit module, the first switch is electrically connected between the processing circuit module and the MOS tube, the processing circuit module is electrically connected to a power supply of the vehicle, and the processing circuit module prevents the power supply of the vehicle from reversely supplying power to the second oil pump;

[0036] The second electrical connection channel includes a second switch and a power circuit module, the second switch is electrically connected between the processing circuit module and the MOS tube, the power circuit module is electrically connected to the power supply, and the power circuit module adjusts the voltage input to the oil pump motor;

[0037] The controller is signal-connected to the first switch and the second switch;

[0038] When the oil pump motor is in the second working position, the controller controls the second switch to be turned on and the first switch to be turned off;

[0039] When the oil pump motor is in the third working position, the controller controls the first switch to be turned on, and controls the second switch to be turned off.

[0040] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0042] Figure 1 is a first partial structural schematic diagram of a cooling system in an embodiment of the present invention;

[0043] Figure 2is a second partial structural schematic diagram of the cooling system in an embodiment of the present invention;

[0044] Figure 3 is a third partial structural schematic diagram of the cooling system in an embodiment of the present invention;

[0045] Figure 4 Schematic diagram of electrical connection between the MOS tube and the oil pump motor of the cooling system in an embodiment of the present invention;

[0046] Figure 5 1 is a schematic diagram of the working states of the first oil pump and the second oil pump when the vehicle is in different working states during the Spring Festival in an embodiment of the present invention;

[0047] Figure 6 is a control flow chart of a cooling system in an embodiment of the present invention;

[0048] Figure 7 It is a partial control flow chart of the cooling system in an embodiment of the present invention.

[0049] Description of reference numerals:

[0050] 1. Oil storage parts;

[0051] 2. Components to be cooled;

[0052] 3. First passage; 31. First oil pump; 32. One-way valve;

[0053] 4. Second passage; 41a. Oil pump motor; 41b. Second oil pump;

[0054] 51. Second information collection device (hydraulic); 52. First information collection device; 53. Third information collection device;

[0055] 6. MOS tube;

[0056] 7. Power supply;

[0057] 8. First electrical connection channel; 81. First switch; 82. Processing circuit module;

[0058] 9. Second electrical connection channel; 91. Second switch; 92. Power circuit module;

[0059] 10. Controller;

[0060] 11. Oil cooler. DETAILED DESCRIPTION

[0061] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0062] In an embodiment of the present application, a hybrid transmission cooling system is provided, such as Figure 1 As shown, the cooling system includes an oil storage member 1, a component to be cooled 2, an oil cooler 11, and a first passage 3 and a second passage 4 for connecting the oil storage member 1 and the component to be cooled 2. The oil in the oil storage member 1 flows into the component to be cooled 2 through the first passage 3 and the second passage 4 respectively, and then flows into the oil cooler 11 through the component to be cooled 2. After the oil cooler 11 cools the oil, the oil flows back to the oil storage member 1 through the oil cooler 11.

[0063] The cooling system further includes a first oil pump 31 and a second oil pump 41b, wherein the first oil pump 31 is connected to the first passage 3, and the second oil pump 41b is connected to the second passage 4. In the entire cooling system, the oil reservoir 1 is used to store oil, and the hydraulic pressure of the oil in the oil reservoir 1 is lower than the hydraulic pressure of the oil entering the component to be cooled 2. The low-pressure oil in the oil reservoir 1 is pressurized and pumped into the component to be cooled 2 by the first oil pump 31 and the second oil pump 41b, and then flows out from the component to be cooled 2 to the oil cooler 11.

[0064] The first passage 3 is also provided with a one-way valve 32 . The first oil pump 31 and the one-way valve 32 are connected and arranged in sequence along the flow direction of the oil. The one-way valve 32 is connected between the first oil pump 31 and the oil inlet of the component 2 to be cooled.

[0065] In the embodiment of the present application, the first oil pump 31 is connected to the engine of the vehicle by transmission. When the engine of the vehicle starts to work, the first oil pump 31 is in a working position. When the vehicle is in a state of pure electric operation, the engine is not working, and the first oil pump 31 is in a non-working position.

[0066] By setting a one-way valve 32 on the first oil pump 31, it is possible to prevent the vehicle from being in a purely electric operating state. Only when the second oil pump 41b pumps oil for the component to be cooled 2, the high-pressure oil pumped out from the oil outlet of the second oil pump 41b flows back to the oil storage component 1 through the first oil pump 31.

[0067] like Figure 1 and Figure 2 As shown, the second passage 4 is provided with a second oil pump 41b, which is connected to the output end of the oil pump motor 41a, and the vehicle power supply 7 supplies power to the oil pump motor 41a. The oil outlet of the second oil pump 41b is located at the oil high pressure end P 高 The oil outlet of the second oil pump 41b is connected to the oil inlet of the component to be cooled 2. The oil outlet of the second oil pump 41b is located at the low-pressure end P of the oil. 低 The oil inlet of the second oil pump 41 b is connected to the oil outlet of the oil storage member 1 .

[0068] In the embodiments of the application, Figure 6 As shown, a control method for a hybrid transmission cooling system is also provided. The hybrid transmission cooling system is used to perform the method, and the method includes:

[0069] Step 1: Obtain the working status of the first oil pump 31;

[0070] Step 2: When the first oil pump 31 is in the working position, obtain the actual hydraulic pressure value P of the cooling system 实， And obtain the required hydraulic pressure value P to meet the cooling needs of the cooling system 需 ;

[0071] Step 3: When the actual hydraulic pressure value P 实 and the required hydraulic pressure value P 需 When the difference is within the first threshold range, the oil pump motor 41a is controlled to be in the first working position, and the oil pump motor 41a stops rotating in the first working position.

[0072] The cooling system includes a first information acquisition device 52, a second information acquisition device 51 and a controller 10, and the controller 10, the first information acquisition device 52 and the second information acquisition device 51 are connected by signals. The first information acquisition device 52 can collect the engine speed as the working information of the first oil pump 31. The first information acquisition device 52 is an engine speed detection device. The second information acquisition device 51 is used to collect the actual hydraulic value P of the cooling system. 实 .P 实 The value of is the sum of the hydraulic pressures of the oil pumped out by the first oil pump 31 and the second oil pump 41b.

[0073] In step 1, the working information of the engine is obtained to determine whether the first oil pump 31 is in the working position or in the non-working position. The engine speed is collected by the engine speed detection device. When the engine speed is not 0, it is determined that the first oil pump 31 is in the working position. Of course, the working information of the first oil pump can also be determined not by the engine speed, but by the flow rate, flow rate and other information of the first oil pump as the working information of the first oil pump.

[0074] In step 2, the second information collection device 51 is a pressure sensor disposed at one side of the oil inlet of the component to be cooled 2. The pressure sensor collects the oil hydraulic pressure of the oil inlet of the component to be cooled 2 as P 实 The controller 10 obtains the data collected by the pressure sensor and the engine speed detection device.

[0075] The cooling system in the present application further includes a third information acquisition device (not shown in the figure), which is used to obtain the temperature information of the oil. The third information acquisition device is a temperature sensor, which is arranged on one side of the oil storage part 1. The controller 10 obtains the temperature of the oil in the oil storage part 1 through the third information acquisition device, and thus adjusts the required hydraulic pressure value P of the cooling system according to the temperature of the oil in the oil storage part 1. 需, so that the temperature of the oil in the oil storage part 1 meets the set threshold.

[0076] Of course, the required hydraulic pressure value P of the cooling system can also be adjusted according to the temperature of the oil flowing out of the component to be cooled 2. 需 , technical personnel in this field can set it according to their needs.

[0077] In step 3, the actual hydraulic pressure value P 实 and the required hydraulic pressure value P 需 When the difference between the actual hydraulic value P meets the first threshold, a first signal is generated. The first threshold is the pressure difference threshold. 实 and the required hydraulic pressure value P 需 When the difference between the actual hydraulic pressure value P 实 and the required hydraulic pressure value P 需 The oil pump motor 41a is approximately equal to the oil pump 41b, or the difference between them is within a reasonable range. At this time, the controller 10 generates a first signal, and the oil pump motor 41a receives the first signal and switches to the first position. The oil pump motor 41a stops rotating, thereby disconnecting the oil inlet and the oil outlet of the second oil pump 41b. 实 and the required hydraulic pressure value P 需 When the difference between the actual hydraulic pressure value P 实 and the required hydraulic pressure value P 需 is approximately equal, that is, the first oil pump 31 can basically meet the required hydraulic pressure value P of the cooling system when working alone. 需 At this time, the second oil pump 41b is in a non-operating state, and the oil pump motor 31a stops rotating.

[0078] At this time, the first oil pump 31 is in the working position. Since the second oil pump 41b is not working and no one-way valve 32 is provided between the second oil pump 41b and the oil inlet of the component to be cooled 2, under the action of the first oil pump 31, the oil outlet of the second oil pump 41b will form an oil high pressure end P 高 The oil inlet of the second oil pump 41b will form an oil pump low pressure end P 低 , thus a hydraulic pressure difference is formed at both ends of the second oil pump 41b. Since the oil pump motor 41a is in the first position, it can prevent the oil high pressure end P 高 The oil flows back to the oil storage member 1 through the oil outlet of the second oil pump 41b. At this time, the second oil pump 41b itself plays the role of a one-way valve 32.

[0079] In a specific embodiment, Figure 2 , Figure 3 and Figure 4As shown, the oil pump motor 41a is electrically connected to the vehicle power supply 7 through the MOS tube 6. The oil pump motor 41a adopts a brushless DC motor, and the oil pump motor 41a includes a multi-phase motor winding. The MOS tube 6 includes a plurality of bridges, and the bridges are connected to each phase of the motor winding one by one.

[0080] Among them, the aforementioned first signal includes: controlling any one of the bridges of the MOS tube 6 to be connected, and the other bridges to be closed. When the bridge of the MOS tube 6 is connected, the vehicle power supply 7 can provide current to the corresponding single-phase motor winding through the bridge, and the oil pump motor can be prevented from rotating by continuously providing current to the single-phase motor winding. Specifically, the controller supplies pulse-width modulation (PWM) direct current to one of the three-phase motor windings of the electronic oil pump 6, and adjusts the current by adjusting the duty cycle of the PWM direct current. In this way, precise control of the current can be achieved, so that the resisting torque can resist the high-pressure end of the oil to form a balanced stop.

[0081] The magnitude of the current is related to the second oil pump 41b used to resist the high pressure end P of the oil. 高 The torque applied to the second oil pump 41b is related to the pressure. In a specific example, according to the oil pump characteristics: torque T = pressure P * displacement * constant coefficient, the displacement is a fixed property of the second oil pump 41b, and the pressure at the high pressure end P of the oil is resisted. 高 The resisting torque required is proportional to the pressure.

[0082] In the characteristic curve of the oil pump motor 41a, the resistance to the oil high pressure end P 高 The required resisting torque is proportional to the current. Therefore, combining the characteristics of the oil pump and the motor, it can be seen that the current required to generate the resisting torque is proportional to the pressure at the high-pressure end of the oil.

[0083] By adopting the technical solution in this application, when the actual hydraulic pressure value P 实 and the required hydraulic pressure value P 需 When the difference is within the first threshold range, the oil pump motor 41a is controlled to stop rotating, so that the oil inlet and the oil outlet of the second oil pump 41b are disconnected. In this way, even if the second oil pump 41b is directly connected to the component to be cooled 2, oil backflow can be prevented, so it is possible to avoid setting a one-way valve between the second oil pump 41b and the component to be cooled 2, thereby avoiding the problem of flow attenuation and reduced pumping efficiency caused by setting a one-way valve between the second oil pump 41b and the component to be cooled 2.

[0084] In some embodiments of the present application, see Figure 6, the control signal also includes a second signal, according to which the oil pump motor 41a is controlled to be in the second position. In the second position, the oil pump motor 41a drives the second oil pump 41b to pump oil for the component to be cooled 2. That is, in the second position, the second oil pump 41b rotates in the first direction to transport the oil from its oil inlet to its oil outlet and pump it into the oil inlet of the component to be cooled 2.

[0085] Specifically, see Figure 7 , after step 2, further comprising:

[0086] Step 4: at the actual hydraulic pressure value P 实 Less than the required hydraulic pressure value P 需 In the case of, the oil pump motor 41a is controlled to be in the second position, and the oil pump motor 41a drives the second oil pump 41b to pump oil for the component to be cooled 2. There is no control sequence between step 3 and step 4.

[0087] Specifically, at the actual hydraulic pressure value P 实 Less than the required hydraulic pressure value P 需 In the case of P, a second signal is generated. 实 <P 需 In the case of 需 , the controller 10 generates a second signal, the oil pump motor 41a receives the second signal and switches to the second position to start pumping oil, so as to increase the actual hydraulic value P 实 So that the actual hydraulic value P 实 Able to meet the required hydraulic pressure value P 需 .

[0088] In a specific embodiment, the step of controlling the oil pump motor to be in the second working position further includes:

[0089] Get the speed value of the vehicle engine;

[0090] The actual hydraulic pressure value P of the first oil pump 31 is obtained according to the rotation speed value 实 The actual contribution value P1;

[0091] According to the actual contribution value P1 of the first oil pump 31 and the required hydraulic pressure value P 需 The difference between generates a fourth signal;

[0092] According to the fourth signal, the rotation speed of the oil pump motor 41 a is controlled.

[0093] Specifically, the controller 10 obtains the engine speed value collected by the engine speed detection device. The controller 10 then calculates the actual contribution value P1 of the first oil pump 31 according to the engine speed value. The actual contribution value P1 is also the pressure buildup of the first oil pump 31. The pressure buildup of the first oil pump 31 refers to the hydraulic pressure of the oil pumped into the oil inlet of the component 2 to be cooled by the first oil pump 31. The actual contribution value P1 of the first oil pump 31 is compared with the hydraulic pressure value P required by the cooling system. 需 The controller 10 controls the rotation speed of the oil pump motor 41a according to the difference, thereby changing the hydraulic pressure of the oil pumped by the second oil pump 41b.

[0094] In this embodiment, since the one-way valve 32 is eliminated between the second oil pump 41 b and the component to be cooled 2 , flow attenuation is effectively avoided, thereby improving the accuracy of speed regulation of the oil pump motor 41 a.

[0095] In other embodiments, Figure 6 As shown, the control signal also includes a third signal, according to which the oil pump motor 41a is controlled to be in the third position. In the third position, the oil pump motor 41a can be driven by the second oil pump 41b to generate electricity.

[0096] Specifically, after step 2, the method further includes:

[0097] Step 5: At the actual hydraulic pressure value P 实 Greater than the required hydraulic pressure value P 需 When the rotation speed of the vehicle engine is greater than the second threshold, the oil pump motor 41a is controlled to be in the third position, and in the third position, the second oil pump 41b drives the oil pump motor 41a to generate electricity.

[0098] At the actual hydraulic pressure value P 实 Greater than the required hydraulic pressure value P 需 When the speed of the vehicle engine is greater than the second threshold, a third signal is generated. When the second oil pump 41b is in the third position, the second oil pump 41b can be driven by the oil high pressure end P located at one side of its oil outlet. 高 The oil pump motor 41a is driven to rotate and generate electricity.

[0099] In the third position, the second oil pump 41b is at the oil high pressure end P at its oil outlet side. 高 Under the action of the first direction, it rotates in the opposite direction, that is, toward the low-pressure end P of the oil. 低 Rotate to transport the oil from its oil outlet to its oil inlet, and transport the oil from its oil inlet to the oil storage member 1.

[0100] Specifically, in order to execute the above control method, Figure 3As shown, the cooling system in the present application further includes a first electrical connection channel 8 and a second electrical connection channel 9, and the vehicle's power supply 7 is electrically connected to the MOS tube 6 through the first electrical connection channel 8 and the second electrical connection channel 9 respectively.

[0101] When the oil pump motor 41a is in the second position, the second electrical connection channel 9 is controlled to be opened and the first electrical connection channel 8 is closed, so that the vehicle's power supply 7 supplies power to the oil pump motor 41a through the second electrical connection channel 9. When the oil pump motor 41a is in the third position, the first electrical connection channel 8 is controlled to be opened and the second electrical connection channel 9 is controlled to be closed, so that the oil pump motor 41a supplies power to the vehicle's power supply 7 through the first electrical connection channel 8.

[0102] In a specific embodiment, see Figure 3 The first electrical connection channel 8 includes a first switch 81 and a processing circuit module 82. The first switch 81 is electrically connected between the processing circuit module 82 and the MOS tube 6. The processing circuit module 82 is electrically connected to the vehicle's power supply 7. The processing circuit module 82 is used to prevent the vehicle's power supply 7 from reversely supplying power to the second oil pump 41b.

[0103] The second electrical connection channel 9 includes a second switch 91 and a power circuit module 92. The second switch 91 is electrically connected between the processing circuit module 82 and the MOS tube 6. The power circuit module 92 is electrically connected to the power supply 7. The power circuit module 92 is used to adjust the voltage input to the oil pump motor 41a. The controller 10 is signal-connected to the first switch 81 and the second switch 91.

[0104] At the second station, see Figure 3 and Figure 4 , the controller 10 closes the first switch 81 and opens the second switch 91. The controller 10 controls the bridge of the MOS tube 6, and sequentially inputs the current of the phase sequence adapted to the high and low ends of the three-phase motor winding to drive the oil pump motor 41a. The current along Figure 4 The oil flows in the direction indicated by the dashed arrow, thereby the oil pump motor 41 a can drive the second oil pump 41 b to rotate in the first direction to pump oil to the component 2 to be cooled.

[0105] At the third working position, the controller 10 turns on the first switch 81 and turns off the second switch 91 .

[0106] The MOS transistor 6 also includes a freewheeling diode, and each bridge of the MOS transistor 6 is electrically connected to each phase motor winding of the oil pump motor 41a through a corresponding freewheeling diode, thereby enabling the current generated by the oil pump motor 41a to flow to the power supply 7 through the first electrical connection channel 8.

[0107] By adopting this method, short circuit between the first electrical connection channel 8 and the second electrical connection channel 9 can be avoided, and a large current shock can be avoided when the second oil pump 41b generates electricity, thereby avoiding damage to the controller 10 or other components.

[0108] In actual use, Figure 5 As shown, Figure 5 The solid line in the middle represents the working state of the first oil pump 31, and the dotted line represents the working state of the second oil pump 41b. The ordinate represents the oil pump speeds of the first oil pump 31 and the second oil pump 41b, and the abscissa represents the working state of the vehicle.

[0109] See also Figure 5 As shown in sections A and F, when the vehicle is in the pure electric operation mode, the first oil pump 31 is in the non-operating position and the engine is not working. The second oil pump 41b alone pumps oil for the cooling system. In sections B to E, the first oil pump 31 is in the operating position, and the second oil pump 41b switches to different positions as the oil pump speed of the first oil pump 31 changes.

[0110] like Figure 5 As shown in the middle section B, after the vehicle engine starts to work, the initial engine speed is low, and the speed of the first oil pump 31 is correspondingly low. 实 The actual contribution value P1 is low and cannot meet the required hydraulic value P of the cooling system. 需 .

[0111] The controller 10 turns off the first switch 81 of the first electrical connection path and turns on the second switch 91 of the second electrical connection path. The power supply 7 starts to supply power to the second oil pump 41b, and the second oil pump 41b starts to rotate and pump oil to make up for the difference between P1 and P2. 需 The difference between .

[0112] As the engine speed gradually increases, P1 of the first oil pump 31 gradually increases, and the speed of the second oil pump 41b gradually decreases. When the speed of the second oil pump 41b is 0, the oil pump motor 41a is in the first position, and the oil pump motor 41a stops rotating to prevent oil backflow.

[0113] In the C, D, and E sections, as the engine speed of the vehicle further increases, the actual contribution value P1 of the first oil pump 31 exceeds the required hydraulic pressure value P 需 The controller 10 obtains the engine speed collected by the first information collection device 52. When the engine speed is greater than the second threshold, the controller 10 controls the second oil pump 41b to switch to the third position. In the third position, the oil pump motor 41a starts to generate electricity. At this time, the oil pump speed is a negative value. Those skilled in the art can set the range of the second threshold by themselves, and by setting the range of the second threshold, ensure that the actual hydraulic value P 实and the required hydraulic pressure value P 需 Suitable.

[0114] In the sections C, D and E, the section C represents the working state of the first oil pump 31 and the second oil pump 41b when the vehicle is accelerating, at which time the speed of the first oil pump 31 increases, and the second oil pump 41b is in the third position to supply power to the power source 7. The turning part in the section D represents the deceleration of the vehicle, and even if the vehicle is decelerating, the second oil pump 41b is still in the third position to supply power to the power source 7.

[0115] At this time, the controller 10 no longer sends a control signal to the MOS tube 6, and the motor rotates automatically under the action of the second oil pump 41b, and converts mechanical energy into electrical energy through electromagnetic induction. The electrical energy flows to the positive electrode of the power supply 7 through the freewheeling diode connected to the MOS tube 6, thereby storing the electrical energy in the power supply 7. Before entering the positive electrode of the power supply 7, the electrical energy will first pass through the processing circuit module 82, which can ensure that the electrical energy can only flow from the oil pump motor 41a to the power supply 7 in one direction, thereby preventing the power supply 7 from reversely charging the second oil pump 41b when the power generation voltage of the oil pump motor 41a is lower than the voltage of the power supply 7.

[0116] In this way, the controller 10 obtains the required hydraulic pressure value P 需 The size can be adjusted according to the required hydraulic value P 需 The size of the oil pump motor 41a is controlled to switch between the first position, the second position and the third position so that the required hydraulic pressure value P 需 Always within the appropriate range, and when the first oil pump 31 works alone, the actual hydraulic pressure value P 实 Also greater than the required hydraulic pressure value P 需 When the oil pump motor 41a is used, the excess energy can be used to generate electricity. Thus, electric energy can be collected to reduce energy waste.

[0117] Embodiment 1

[0118] In this embodiment, the control method of the cooling system is described by taking the vehicle engine in a working state as an example.

[0119] The first information collection device 52 collects the speed of the vehicle engine as the working information of the engine, and sends the information to the controller 10. After the controller 10 obtains the working information of the engine, when the speed of the engine is not 0, it determines that the engine is in the working state. At this time, the first oil pump 31 is in the working position.

[0120] In addition, the controller 10 can calculate the actual hydraulic pressure value P of the first oil pump 31 according to the engine speed collected by the first information collection device 52. 实 The actual contribution value P1.

[0121] The second information collection device 51 obtains the hydraulic pressure of the oil inlet of the component to be cooled 2 as the actual hydraulic pressure value P of the cooling system. 实 The actual hydraulic pressure value P 实 Sent to the controller 10, the controller 10 obtains P 实 .

[0122] The third information collection device obtains the temperature of the oil in the oil storage part 1 and sends the temperature to the controller 10. The controller 10 obtains the required hydraulic pressure value P required for cooling of the cooling system according to the temperature of the oil. 需 .

[0123] When the engine speed collected by the first information collection device 52 is less than 2000 rpm, P1 is less than 3 bar. Since the second oil pump 41b is not working at this time, P 实 =P1<3bar. The P obtained by the controller 10 需 >3bar, that is, at this time, the pressure built up by the first oil pump 31 cannot meet the hydraulic value required by the cooling system. At this time, the controller 10 turns off the second switch 91 and turns on the first switch 81 so that the power supply 7 can supply power to the oil pump motor 41a. The controller 10 controls the vehicle power supply 7 to supply power to the oil pump motor 41a, and the oil pump motor 41a drives the second oil pump 41b to rotate in the first direction to start pumping oil, so as to pump the oil from one side of the oil storage part 1 into the component 2 to be cooled.

[0124] Optionally, the controller 10 can 需 The difference between P1 and P 需 Dynamic adjustment of the rotation speed of the oil pump motor 41a is achieved.

[0125] When the engine speed gradually increases to greater than 3500 rpm and less than 4500 rpm, the controller 10 calculates the actual contribution value of the first oil pump 31 to be 3 bar ≤ P1 < 8 bar, and the second oil pump 41 b is in a non-operating state, 3 bar ≤ P 实 <8bar. At this time, the controller 10 obtains P 需 With P1 or P 需 With P 实 When the difference between the two meets the first threshold, in order to prevent the first oil pump 31 from forming an oil high pressure end P at the oil outlet side of the second oil pump 41b, 高 Under the action of the second oil pump 41b, the oil flows back through the second oil pump 41b, and the controller 10 turns off the second switch 91 and turns on the first switch 81 so that the power supply 7 can supply power to the oil pump motor 41a. The controller 10 controls the MOS tube 6 so that the power supply 7 continuously energizes any phase motor winding of the oil pump motor 41a to form a resistance torque of 3Nm, so that the oil pump motor 41a is in the first working position and the oil pump motor 41a stops rotating.

[0126] As the engine speed further increases to greater than or equal to 4500 rpm, the controller 10 calculates the actual contribution value P1 ≥ 8 bar of the first oil pump 31. 需 When the pressure is less than 8 bar and at the same time, the controller 10 obtains that the engine speed of the vehicle is greater than or equal to 4500 rpm, the controller 10 controls the second oil pump 41b to enter the third working position, closes the first switch 81, and turns on the second switch 91. At this time, the vehicle power supply 7 is disconnected from the oil pump motor 41a, and the oil pump motor 41a is driven to rotate by the second oil pump 41b.

[0127] The second oil pump 41b is at the oil high pressure end P 高 , starts to rotate in the opposite direction of the first direction to transport the oil from the oil outlet of the second oil pump 41b to the oil inlet of the second oil pump 41b. At the same time, the oil pump motor 41a starts to generate electricity driven by the second oil pump 41b, and the oil pump motor 41a starts to supply power to the vehicle power supply 7. Of course, the electric energy of the oil pump motor 41a can also supply power to the oil pump motor 41a itself. Those skilled in the art can adjust it by themselves.

[0128] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A control method for a hybrid transmission cooling system, characterized in that: The cooling system comprises an oil storage member, a component to be cooled and an oil cooler constituting a circuit, wherein the oil storage member and the component to be cooled are connected via a first passage and a second passage, wherein the first passage is provided with a first oil pump driven by a vehicle engine, and the second passage is provided with a second oil pump driven by an oil pump motor; The control method comprises: Obtaining the working status of the first oil pump; When the first oil pump is in the working position, the actual hydraulic pressure value P of the cooling system is obtained. 实， And obtain the required hydraulic pressure value P that meets the cooling needs of the cooling system 需 ; When the actual hydraulic pressure value P 实 and the required hydraulic pressure value P 需 When the difference is within a first threshold range, the oil pump motor is controlled to be in a first working position, and the oil pump motor stops rotating in the first working position.

2. The control method of the hybrid transmission cooling system according to claim 1, characterized in that: The oil pump motor is electrically connected to the power supply of the vehicle through a MOS tube, the oil pump motor includes a multi-phase motor winding, the MOS tube includes a plurality of bridges, and each bridge is connected to each phase of the motor winding in a one-to-one correspondence; The step of controlling the oil pump motor to be in the first working position includes: Any one of the bridges of the MOS tubes is controlled to be connected, and the other bridges are controlled to be closed.

3. The control method of the hybrid transmission cooling system according to claim 1, characterized in that: include: At the actual hydraulic pressure value P 实 Less than the required hydraulic pressure value P 需 In this case, the oil pump motor is controlled to be in the second working position, and the oil pump motor drives the second oil pump to pump oil for the component to be cooled.

4. The control method of the hybrid transmission cooling system according to claim 3, characterized in that: The step of controlling the oil pump motor to be in the second working position also includes: Get the speed value of the vehicle engine; The actual hydraulic pressure value P of the first oil pump is obtained according to the rotation speed value 实 The actual contribution value P1; According to the actual contribution value P1 of the first oil pump and the required hydraulic pressure value P 需 The difference controls the speed of the oil pump motor.

5. The control method of the hybrid transmission cooling system according to claim 3, characterized in that: include: At the actual hydraulic pressure value P 实 Greater than the required hydraulic pressure value P 需 When the rotation speed of the vehicle engine is greater than the second threshold, the oil pump motor is controlled to be in a third position, and in the third position, the second oil pump drives the oil pump motor to generate electricity.

6. The control method of the hybrid transmission cooling system according to claim 5, characterized in that: The cooling system comprises a MOS tube, a first electrical connection channel and a second electrical connection channel, and the power supply of the vehicle is electrically connected to the MOS tube through the first electrical connection channel and the second electrical connection channel respectively; When the oil pump motor is in the second working position, the second electrical connection channel is controlled to be opened and the first electrical connection channel is closed, so that the power supply of the vehicle supplies power to the oil pump motor through the second electrical connection channel; When the oil pump motor is in the third working position, the first electrical connection channel is controlled to be opened, and the second electrical connection channel is controlled to be closed, so that the oil pump motor supplies power to the vehicle through the first electrical connection channel.

7. A hybrid transmission cooling system, characterized in that: The invention comprises an oil storage part, a component to be cooled, an oil cooler and a controller constituting a circuit, wherein the oil storage part and the component to be cooled are connected through a first passage and a second passage, the first passage is provided with a first oil pump driven by a vehicle engine, and the second passage is provided with a second oil pump driven by an oil pump motor; The controller obtains the working information of the first oil pump and the actual hydraulic value P of the cooling system 实 and the required hydraulic pressure value P to meet the cooling needs of the cooling system 需 ; When the actual hydraulic pressure value P 实 and the required hydraulic pressure value P 需 When the difference is within a first threshold range, the controller controls the oil pump motor to be in a first working position, and in the first working position, the oil pump motor stops rotating.

8. The hybrid transmission cooling system according to claim 7, characterized in that: The oil pump motor is electrically connected to a power source of the vehicle, and the oil pump motor includes a multi-phase motor winding; The cooling system further comprises a MOS tube connected to a power source of the vehicle, the MOS tube comprises a plurality of bridges, the bridges are connected to each phase of the motor winding in a one-to-one correspondence, and the MOS tube is connected to the controller signal; The controller controls any one of the bridges of the MOS tubes to be connected, and controls the other bridges to be closed.

9. The hybrid transmission cooling system according to claim 8, characterized in that: At the actual hydraulic pressure value P 实 Less than the required hydraulic pressure value P 需 In the case of , the controller controls the oil pump motor to be in the second working position, and the oil pump motor drives the second oil pump to pump oil for the component to be cooled; At the actual hydraulic pressure value P 实 Greater than the required hydraulic pressure value P 需 When the rotation speed of the vehicle engine is greater than the second threshold, the controller controls the oil pump motor to be in a third position, and in the third position, the second oil pump drives the oil pump motor to generate electricity.

10. The hybrid transmission cooling system according to claim 9, characterized in that: The cooling system comprises a first electrical connection channel and a second electrical connection channel, and the power supply of the vehicle is electrically connected to the MOS tube through the first electrical connection channel and the second electrical connection channel respectively; The first electrical connection channel includes a first switch and a processing circuit module, the first switch is electrically connected between the processing circuit module and the MOS tube, the processing circuit module is electrically connected to a power supply of the vehicle, and the processing circuit module is used to prevent the power supply of the vehicle from reversely supplying power to the second oil pump; The second electrical connection channel includes a second switch and a power circuit module, the second switch is electrically connected between the processing circuit module and the MOS tube, the power circuit module is electrically connected to the power supply, and the power circuit module is used to adjust the voltage input to the oil pump motor; The controller is signal-connected to the first switch and the second switch; When the oil pump motor is in the second working position, the controller controls the second switch to be turned on and the first switch to be turned off; When the oil pump motor is in the third working position, the controller controls the first switch to be turned on, and controls the second switch to be turned off.

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