Cooling system, gearbox and control method

Abstract

The invention discloses a cooling system, a gearbox and a control method, the cooling system comprises a generator, a first spraying assembly and an electronic oil pump, the electronic oil pump is connected with the first spraying assembly through a first pipeline, and the first pipeline is further provided with a control valve. When the first working parameter of the generator meets the preset condition, the control valve is in an open state, the first pipeline is communicated, and the rotating speed of the electronic oil pump is at the first rotating speed, so that the requirements for cooling and lubricating the generator and other parts are met, and the stability and reliability of the parts in the working process are improved; when the first working parameter of the generator does not meet the preset condition, the control valve is closed, the first pipeline is disconnected, and the rotating speed of the electronic oil pump is the second rotating speed, so that energy consumption of the electronic oil pump is reduced, and energy utilization efficiency is improved. Wherein the first rotating speed is larger than the second rotating speed, the circulation rate of the cooling oil in the gearbox is increased, so that the flow of the cooling oil in all pipelines is increased, and the cooling and lubricating requirements of all parts are met.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a cooling system, a gearbox and a control method. Background Art

[0002] With the development of hybrid vehicles, there are higher requirements for the performance of generators and motors in the gearbox. When the generator and motor have high speed and power during operation, a lot of heat will be generated, so they need to be cooled to ensure that the generator and motor have stable output performance and long service life.

[0003] In the prior art, both the generator and the motor are connected to pipelines for transmitting oil so as to be cooled by oil cooling. Driven by the electronic oil pump, the oil can flow along the pipelines to the stators and rotors of each motor, thereby achieving cooling and lubrication of the generator and the motor. During the operation of the electronic oil pump, since the pipelines flowing to the generator and the motor are always in an open state, in order to meet the flow requirements of the generator and the motor, the electronic oil pump needs to be always at a higher speed, resulting in higher energy consumption of the electronic oil pump. Summary of the invention

[0004] In view of this, the present application provides a cooling system, a gearbox and a control method to solve the technical problem of high energy consumption of electronic oil pumps during operation in the prior art.

[0005] The present application provides a cooling system for a gearbox, the cooling system comprising a motor, a spray device and an electronic oil pump, the motor comprising a generator, the spray device comprising a first spray component, the first spray component being used to spray cooling oil onto the generator, the electronic oil pump being connected to the first spray component via a first pipeline; wherein the first pipeline is provided with a control valve.

[0006] When the first operating parameter of the generator meets the preset condition, the control valve is in an open state to connect the first pipeline and the speed of the electronic oil pump is at a first speed. When the first operating parameter of the generator does not meet the preset condition, the control valve is in a closed state to disconnect the first pipeline and the speed of the electronic oil pump is at a second speed, and the first speed is greater than the second speed.

[0007] In an embodiment of the present application, the cooling system can control the connection or disconnection between the electronic oil pump and the first spray assembly through a control valve, thereby realizing the opening or closing of the first spray assembly, so that when the generator needs cooling and lubrication, the control valve is controlled to open, so that the first pipeline is connected, so that the first spray assembly starts to spray cooling oil to the generator, thereby improving the heat dissipation and lubrication effects of the generator; when the generator does not need cooling and lubrication, the control valve is controlled to close, so that the first pipeline is disconnected, so that the first spray assembly stops spraying cooling oil to the generator, thereby reducing the energy consumption of the electronic oil pump.

[0008] Specifically, the generator has a first operating parameter during operation, and the cooling system can control the control valve to open or close by judging whether the first operating parameter of the generator meets a preset condition.

[0009] When the first operating parameter of the generator meets the preset conditions, the control valve is in an open state, the first pipeline is connected, the speed of the electronic oil pump is at a first speed, and the cooling oil flows along the first pipeline under the action of the electronic oil pump, and is sprayed on the generator through the first spray assembly, so as to cool and lubricate the generator by oil cooling, which is beneficial to improve the heat dissipation and lubrication effects of the generator and ensure the stability and reliability of the generator during operation.

[0010] When the first operating parameter of the generator does not meet the preset conditions, the control valve is in a closed state, the first pipeline is disconnected, the speed of the electronic oil pump is at a second speed, and the cooling oil flows along other pipelines under the action of the electronic oil pump to cool and lubricate other components to ensure the stability and reliability of other components during operation.

[0011] Among them, the first speed is greater than the second speed. Since the electronic oil pump is not only connected to the first spray assembly through the first pipeline, but also communicated with other components through other pipelines, the cooling system when the control valve is in the open state has one more branch for circulating cooling oil than the cooling system when the control valve is in the closed state, resulting in a reduction in the flow of cooling oil originally flowing to other components, thereby failing to meet the cooling and lubrication needs of other components, and thus it is necessary to increase the speed of the electronic oil pump and the circulation rate of the cooling oil in the gearbox, so as to increase the flow of cooling oil in each pipeline and meet the cooling and lubrication needs of each component.

[0012] Therefore, the cooling system in this embodiment realizes the opening or closing of the first spray assembly by setting a control valve on the first pipeline, so that when the first working parameter of the generator meets the preset conditions, the control valve can be controlled to open, the first pipeline can be connected and the speed of the electronic oil pump can be increased to meet the cooling and lubrication requirements of the generator and other components, and the stability and reliability of each component during operation can be improved. When the first working parameter of the generator does not meet the preset conditions, the control valve can be controlled to close, the first pipeline can be disconnected and the speed of the electronic oil pump can be reduced to reduce the energy consumption of the electronic oil pump and improve the energy utilization efficiency.

[0013] In a possible embodiment, the motor also includes an electric motor, the spray device also includes a second spray assembly, the electronic oil pump is connected to the second spray assembly through a second pipeline, and the electronic oil pump is used to drive the cooling oil to flow along the second pipeline and spray it to the electric motor through the second spray assembly.

[0014] In a possible implementation, the spray device is located above the motor along the height direction of the gearbox so that the spraying range of the spray device covers at least a portion of the outer surface of the motor; on the outer surface of the motor, the angle between the tangent of the spray device to the motor and the line connecting the spray device and the center line of the motor is the spraying angle θ of the spray device, and θ satisfies 2°≤θ≤5°.

[0015] In a possible embodiment, the spray device also includes a second spray assembly, each spray assembly includes at least a first spray pipe and a second spray pipe, and the first spray pipe and the second spray pipe are symmetrically distributed with respect to the center line of the motor; each spray pipe includes at least a first spray area and a second spray area, and the first spray area and the second spray area are symmetrically distributed with respect to the line connecting each spray pipe and the axis of the motor.

[0016] In a possible implementation, each of the spray pipes is provided with a plurality of spray holes, and the plurality of spray holes are spaced apart along the length direction of the spray pipe; a distance between two adjacent spray holes is L, and L satisfies 2mm≤L≤20mm.

[0017] In a possible implementation, each of the spray pipes is provided with a first spray hole area and a second spray hole area, and along the length direction of the spray pipe, the second spray hole area is distributed on both sides of the first spray hole area, the first spray hole area is used to spray cooling oil onto the stator core of the motor, and the second spray hole area is used to spray cooling oil onto the stator winding of the motor; the diameter of the spray hole in the first spray hole area is R1, and R1 satisfies 1mm≤R1≤1.5mm; the diameter of the spray hole in the second spray hole area is R2, and R2 satisfies 1.5mm≤R2≤2.5mm.

[0018] In a possible implementation, along the height direction of the gearbox, the distance between the spray device and the outer surface of the motor is H, and H satisfies 5mm≤H≤10mm.

[0019] In a possible embodiment, the motor also includes an electric motor, the electronic oil pump is connected to the shaft of the generator through a third pipeline, and the electronic oil pump is connected to the shaft of the electric motor through a fourth pipeline; the shaft is a hollow shaft, and the shaft is provided with a straight hole and an inclined hole, along the length direction of the shaft, the inclined hole is located on the side of the straight hole close to the end of the shaft, and the straight hole and the inclined hole are distributed at intervals along the circumference of the shaft.

[0020] The present application also provides a gearbox, which includes a shell and a cooling system, the shell having a accommodating cavity, and the cooling system is a cooling system as described in any of the above items; wherein the motor and the spray device are both installed in the accommodating cavity, and the electronic oil pump and the control device are both installed in the shell.

[0021] In an embodiment of the present application, the shell is also provided with an oil filter, an oil cooler, a main oil channel and an oil return tank. At least part of the oil filter is located in the oil return tank, and the oil filter is connected to one end of the electronic oil pump. The other end of the electronic oil pump is connected to one end of the oil cooler through the main oil channel. The other end of the oil cooler is respectively connected to the first pipeline, the second pipeline, the third pipeline and the fourth pipeline through the main oil channel.

[0022] During the cooling oil circulation process, when the control valve is in the open state, the cooling oil, driven by the electronic oil pump, first flows from the return oil tank into the oil filter so that impurities in the cooling oil, such as metal powder generated by wear of various components in the gearbox during operation, can be filtered out through the oil filter to keep the cooling oil flowing into the motor clean, which is beneficial to extending the working life of the gearbox; after the cooling oil to be cleaned flows out of the oil filter, it can flow into the oil cooler through the main oil channel driven by the electronic oil pump to cool the cooling oil so as to achieve a better heat dissipation effect on the motor; after the cooling oil to be cooled flows out of the oil cooler, it can flow to the first pipeline, the second pipeline, the third pipeline and the fourth pipeline respectively through the main oil channel driven by the electronic oil pump, wherein the cooling oil flowing to the first pipeline can be sprayed on the stator of the generator through the first spray assembly, and directly contact the stator of the generator. The cooling oil flowing to the second pipeline can be sprayed on the stator of the motor through the second spray assembly, directly exchange heat with the stator of the motor, and slide down to the oil return tank along the outer surface of the stator of the motor under the action of gravity; the cooling oil flowing to the third pipeline can be sprayed on the inner side of the stator winding of the generator and the bearing of the shaft of the generator through the shaft of the generator, and this part of the cooling oil will fall back to the oil return tank under the action of gravity after heat exchange; the cooling oil flowing to the fourth pipeline can be sprayed on the inner side of the stator winding of the motor and the bearing of the shaft of the motor through the shaft of the motor, and this part of the cooling oil will fall back to the oil return tank under the action of gravity after heat exchange, so as to facilitate the next cooling cycle, thereby meeting the cooling system's demand for motor cooling and ensuring the working condition of the motor.

[0023] The present application also provides a control method for a cooling system, which is used to control a cooling system as described in any of the above items, and the control method includes: detecting a first operating parameter of the generator; when the first operating parameter meets the preset condition, controlling the control valve to open, so that the first spray assembly is connected to the electronic oil pump, and the electronic oil pump is controlled to be at a first speed; when the first operating parameter does not meet the preset condition, controlling the control valve to close, so that the first spray assembly is disconnected from the electronic oil pump, and the electronic oil pump is controlled to be at a second speed; wherein the first speed is greater than the second speed.

[0024] In the embodiment of the present application, the first detection component is used to detect the first operating parameter of the generator and transmit the detection result to the control device in real time. The control device determines whether the first operating parameter of the generator meets the preset conditions based on the detection result of the first detection component.

[0025] When the control device determines that the first working parameter of the generator meets the preset condition, the control device controls the control valve to open, so that the first spray assembly is connected to the electronic oil pump, so as to cool the generator through the first spray assembly, improve the heat dissipation and lubrication effects of the generator, and ensure the stability and reliability of the generator during operation. At the same time, the control device controls the speed of the electronic oil pump to change to the first speed, which is used to speed up the flow speed of the cooling oil in the main oil channel and each pipeline, so as to meet the cooling and lubrication requirements of other components and ensure the stability and reliability of other components during operation.

[0026] When the control device determines that the first working parameter of the generator does not meet the preset condition, the control device controls the control valve to close, disconnecting the first spray assembly from the electronic oil pump, so as to cool down other components, improve the heat dissipation and lubrication effects of other components, and ensure the stability and reliability of other components during operation. At the same time, the control device controls the speed of the electronic oil pump to change to the second speed, so as to reduce the energy consumption and wear of the electronic oil pump and improve the energy utilization efficiency.

[0027] Therefore, in this embodiment, a control valve is provided on the first pipeline to realize opening or closing of the first spray assembly, so that when the first working parameter of the generator meets the preset condition, the control valve can be controlled to open, the first pipeline can be connected and the speed of the electronic oil pump can be increased to meet the cooling and lubrication requirements of the generator and other components, improve the stability and reliability of each component during operation, and improve the overall working performance of the gearbox. When the first working parameter of the generator does not meet the preset condition, the control valve can be controlled to close, the first pipeline can be disconnected and the speed of the electronic oil pump can be reduced to reduce the energy consumption of the electronic oil pump and improve the energy utilization efficiency.

[0028] In a possible implementation, when the first working parameter meets the preset condition, the control valve is controlled to open so that the first spray assembly is connected to the electronic oil pump, and the electronic oil pump is controlled to be at a first speed. The control method specifically includes: when the first working parameter meets the preset condition, the control valve is controlled to open, and a first preset speed is obtained according to the first working parameter; the second working parameter of the motor is detected, and a second preset speed is obtained according to the second working parameter; the first preset speed is compared with the second preset speed, and the maximum value of the two is taken as the first speed.

[0029] In a possible implementation, when the first working parameter meets the preset condition, the control valve is controlled to open, the first preset speed is obtained according to the first working parameter, the second working parameter of the motor is detected, and the second preset speed is obtained according to the second working parameter. The control method specifically includes: when the first working parameter meets the preset condition, the control valve is controlled to open; according to the first working parameter, a first data table is queried to obtain the first preset speed corresponding to the first working parameter; according to the second working parameter, a second data table is queried to obtain the second preset speed corresponding to the second working parameter.

[0030] In one possible implementation, when the first operating parameter does not meet the preset condition, the control valve is controlled to close, the first spray assembly is disconnected from the electronic oil pump, and the electronic oil pump is controlled to be at a second speed. The control method specifically includes: when the first operating parameter does not meet the preset condition, the control valve is controlled to close, and a third preset speed is obtained according to the first operating parameter; the second operating parameter of the motor is detected, and a fourth preset speed is obtained according to the second operating parameter; the third preset speed is compared with the fourth preset speed, and the maximum value of the two is taken as the second speed.

[0031] In a possible implementation, when the first working parameter does not meet the preset condition, the control valve is controlled to be closed, the third preset speed is obtained according to the first working parameter, the second working parameter of the motor is detected, and the fourth preset speed is obtained according to the second working parameter. The control method specifically includes: when the first working parameter does not meet the preset condition, the control valve is controlled to be closed; according to the first working parameter, a first data table is queried to obtain the third preset speed corresponding to the first working parameter; according to the second working parameter, a third data table is queried to obtain the fourth preset speed corresponding to the second working parameter; wherein the third preset speed is 0r / min.

[0032] In a possible implementation manner, the preset condition is: the operating temperature of the generator is T, and T satisfies T>100° C., and / or the heating power of the generator is P, and P satisfies P>0.2KW.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 is a schematic structural diagram of a gearbox provided in the present application in a specific embodiment;

[0036] Figure 2 yes Figure 1 Rear view of

[0037] Figure 3 yes Figure 1 A front view of the generator;

[0038] Figure 4 It is a flow chart of the control method provided by the present application when the control valve is opened;

[0039] Figure 5 This is a flow chart of the control method provided by the present application when the control valve is closed.

[0040] Description of reference numerals:

[0041] 1- Motor;

[0042] 11- generator;

[0043] 12- Electric motor;

[0044] 13-crankshaft;

[0045] 2-Spraying device;

[0046] 21-first spray assembly;

[0047] 22- second spray assembly;

[0048] 23-first spray pipe;

[0049] 24- second spray pipe;

[0050] 25-first spraying area;

[0051] 26-second spraying area;

[0052] 3-Electronic oil pump;

[0053] 31- first pipeline;

[0054] 32- second pipeline;

[0055] 4-Control valve;

[0056] 5-Oil filter;

[0057] 6-Oil cooler;

[0058] 7-Main oil channel.

[0059] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0060] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0061] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0062] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0063] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0064] The embodiment of the present application provides a cooling system for a gearbox, such as Figure 1 and Figure 2 As shown, the cooling system includes a motor 1, a spray device 2 and an electronic oil pump 3, wherein the motor 1 includes a generator 11, the spray device 2 includes a first spray component 21, the first spray component 21 is used to spray cooling oil to the generator 1, the electronic oil pump 3 is connected to the first spray component 21 through a first pipeline 31, and the first pipeline 31 is provided with a control valve 4.

[0065] In the embodiment of the present application, the cooling system can control the connection or disconnection between the electronic oil pump 3 and the first spray assembly 21 through the control valve 4, thereby realizing the opening or closing of the first spray assembly 21, so that when the generator 11 needs cooling and lubrication, the control valve 4 is controlled to be opened, so that the first pipeline 31 is connected, so that the first spray assembly 21 starts to spray cooling oil to the generator 11, thereby improving the heat dissipation and lubrication effects of the generator 11, and when the generator 11 does not need cooling and lubrication, the control valve 4 is controlled to be closed, so that the first pipeline 31 is disconnected, so that the first spray assembly 21 stops spraying cooling oil to the generator 11, thereby reducing the energy consumption of the electronic oil pump 3.

[0066] Specifically, the generator 11 has a first operating parameter during operation, and the cooling system can control the control valve 4 to open or close by judging whether the first operating parameter of the generator 11 meets a preset condition.

[0067] When the first operating parameter of the generator 11 meets the preset conditions, the control valve 4 is in an open state, the first pipeline 31 is connected, the speed of the electronic oil pump 3 is at a first speed, and the cooling oil flows along the first pipeline 31 under the action of the electronic oil pump 3, and is sprayed on the generator 11 through the first spray assembly 21, so as to cool and lubricate the generator 11 by oil cooling, which is beneficial to improve the heat dissipation and lubrication effects of the generator 11, and ensure the stability and reliability of the generator 11 during operation.

[0068] When the first operating parameter of the generator 11 does not meet the preset conditions, the control valve 4 is in a closed state, the first pipeline 31 is disconnected, the speed of the electronic oil pump 3 is at a second speed, and the cooling oil flows along other pipelines under the action of the electronic oil pump 3, and cools and lubricates other components to ensure the stability and reliability of other components during operation.

[0069] The first rotation speed is greater than the second rotation speed.

[0070] Since the electronic oil pump 3 is not only connected to the first spray assembly 21 through the first pipeline 31, but also connected to other components through other pipelines, the cooling system when the control valve 4 is in the open state has one more branch for circulating cooling oil than the cooling system when the control valve 4 is in the closed state, resulting in a reduction in the flow of cooling oil originally flowing to other components, thereby failing to meet the cooling and lubrication needs of other components. It is therefore necessary to increase the rotation speed of the electronic oil pump 3 and the circulation rate of the cooling oil in the gearbox in order to increase the flow of cooling oil in each pipeline and meet the cooling and lubrication needs of each component.

[0071] Therefore, the cooling system in this embodiment realizes the opening or closing of the first spray assembly 21 by setting a control valve 4 on the first pipeline 31, so that when the first working parameter of the generator 11 meets the preset conditions, the control valve 4 can be controlled to open, the first pipeline 31 can be connected and the rotation speed of the electronic oil pump 3 can be increased to meet the cooling and lubrication requirements of the generator 11 and other components, and the stability and reliability of each component during operation can be improved. When the first working parameter of the generator 11 does not meet the preset conditions, the control valve 4 can be controlled to close, the first pipeline 31 can be disconnected and the rotation speed of the electronic oil pump 3 can be reduced to reduce the energy consumption of the electronic oil pump 3 and improve the energy utilization efficiency.

[0072] In a specific embodiment, the cooling system also includes a first detection component and a control device, the control device is electrically connected or signal-connected to the electronic oil pump 3 and the first detection component, the first detection component is used to detect a first operating parameter of the generator 11 and transmit the detection result to the control device.

[0073] The control device is used to control the control valve 4 to open when the first operating parameter of the generator 11 meets the preset condition so that the first pipeline 31 is connected, and is used to control the speed of the electronic oil pump 3 to be at a first speed. It is also used to control the control valve 4 to close when the first operating parameter of the generator 11 does not meet the preset condition so that the first pipeline 31 is disconnected, and is used to control the speed of the electronic oil pump 3 to be at a second speed.

[0074] In the embodiment of the present application, the first detection member can detect in real time the first operating parameter of the generator 11, and the first operating parameter includes but is not limited to temperature, rotation speed and torque. The first detection member transmits the detection result to the control device in real time, so that the control device can determine whether the first operating parameter of the generator 11 meets the preset condition according to the detection result of the first detection member.

[0075] Specifically, the control device is also electrically connected or signal-connected to the control valve 4 , so that the control device can control the opening or closing of the control valve 4 according to the judgment result.

[0076] When the control device determines that the first operating parameter of the generator 11 meets the preset condition, the control device can control the control valve 4 to open so that the first pipeline 31 is connected, so as to cool and lubricate the generator 11, improve the heat dissipation and lubrication effects of the generator 11, and ensure the stability and reliability of the generator 11 during operation. At the same time, the control device controls the speed of the electronic oil pump 3 to change to the first speed, which is used to speed up the flow speed of the cooling oil in each pipeline, so as to meet the cooling and lubrication requirements of other components, improve the stability and reliability of other components during operation, and help improve the overall working performance of the gearbox.

[0077] When the control device determines that the first operating parameter of the generator 11 does not meet the preset condition, the control device can control the control valve 4 to close, so that the first pipeline 31 is disconnected, so as to cool and lubricate other components, improve the heat dissipation and lubrication effects of other components, and ensure the stability and reliability of other components during operation. At the same time, the control device controls the speed of the electronic oil pump 3 to change to the second speed, so as to reduce the energy consumption and wear of the electronic oil pump 3 and improve the energy utilization efficiency.

[0078] In a specific embodiment, Figure 1 and Figure 2 As shown, the motor 1 also includes an electric motor 12, the spray device 2 also includes a second spray assembly 22, the electronic oil pump 3 is connected to the second spray assembly 22 through a second pipeline 32, and the electronic oil pump 3 is used to drive the cooling oil to flow along the second pipeline 32 and spray to the electric motor 12 through the second spray assembly 22.

[0079] In the embodiment of the present application, the motor 1 also includes a motor 12, the spray device 2 also includes a second spray assembly 22, and the electronic oil pump 3 is connected to the second spray assembly 22 through a second pipeline 32. During the operation of the motor 12, the second pipeline 32 can always be in a connected state, so that the cooling oil can flow to the second spray assembly 22 through the second pipeline 32 under the action of the electronic oil pump 3, and then spray the motor 12 through the second spray assembly 22, so as to cool and lubricate the motor 12 by oil cooling, thereby reducing the possibility of overheating and damage to the motor 12, improving the stability and reliability of the motor 12 during operation, and thus helping to improve the overall working performance of the gearbox. At the same time, the control valve 4 is not provided on the second pipeline 32, so that the electronic oil pump 3 and the second spray assembly 22 are always in a connected state, so that the electronic oil pump 3 can drive the cooling oil to lubricate the motor 12 through the second spray assembly 22 in time after the vehicle is started, which is conducive to further reducing the possibility of wear of the motor 12 and improving the service life of the motor 12.

[0080] In a specific embodiment, the cooling system further includes a second detection component, which is electrically or signal-connected to the control device, and is used to detect a second operating parameter of the motor 12 and transmit the detection result to the control device.

[0081] The control device is used to obtain a first preset speed according to the first operating parameter when the first operating parameter meets the preset condition, obtain a second preset speed according to the second operating parameter, and use the maximum value of the first preset speed and the second preset speed as the first speed. It is also used to obtain a third preset speed according to the first operating parameter when the first operating parameter does not meet the preset condition, obtain a fourth preset speed according to the second operating parameter, and use the maximum value of the third preset speed and the fourth preset speed as the second speed.

[0082] In an embodiment of the present application, the generator 11 has a first operating parameter during operation. The control device can control the control valve 4 to open or close by determining whether the first operating parameter of the generator 11 meets a preset condition, and obtain a first preset speed or a third preset speed according to the first operating parameter of the generator 11.

[0083] The motor 12 has a second operating parameter during operation, and the second detection element can detect the second operating parameter of the motor 12 in real time, and the second operating parameter includes but is not limited to temperature, speed and torque. The second detection element transmits the detection result to the control device, and the control device can determine the working state of the control valve 4 and obtain the second preset speed or the fourth preset speed according to the second operating parameter of the motor 12.

[0084] The first preset speed is greater than the third preset speed, and the second preset speed is greater than the fourth preset speed, so that the first speed is always greater than the second speed, thereby enabling the electronic oil pump 3 to be at a higher speed in various working states.

[0085] When the control valve 4 is in the open state, the control device uses the maximum value of the first preset speed and the second preset speed as the first speed, so that the electronic oil pump 3 has a higher speed when the control valve 4 is in the open state, so as to meet the cooling and lubrication requirements of various components and improve the stability and reliability of various components during operation.

[0086] When the control valve 4 is in a closed state, the control device uses the maximum value of the third preset speed and the fourth preset speed as the second speed, so that the electronic oil pump 3 has a higher speed when the control valve 4 is closed, which is used to reduce the energy consumption of the electronic oil pump 3 while meeting the cooling and lubrication requirements of various components, thereby improving the stability and reliability of various components during operation.

[0087] Therefore, no matter whether the control valve 4 in this embodiment is opened or not, the electronic oil pump 3 has a relatively high rotation speed to meet the demand of each component for cooling oil, thereby ensuring the stability and reliability of the gearbox during operation.

[0088] In a specific embodiment, Figure 1 , Figure 2 and Figure 3 As shown, along the height direction of the gearbox, the spray device 2 is located above the motor 1 so that the spraying range of the spray device 2 covers at least a portion of the outer surface of the motor 1, wherein, on the outer surface of the motor 1, the angle between the tangent of the spray device 2 to the motor 1 and the connection between the spray device 2 and the center line of the motor 1 is the spraying angle θ of the spray device 2, and θ satisfies 2°≤θ≤5°.

[0089] In the embodiment of the present application, the spray device 2 is located above the motor 1 along the height direction of the gearbox so that the cooling oil can be sprayed on the outer surface of the motor 1 and caused to slide along the outer surface of the motor 1 under the action of gravity, so that the cooling oil covers most of the outer surface of the motor 1, thereby increasing the contact area between the cooling oil and the motor 1, which is beneficial to improving the cooling effect of the motor 1, ensuring that the motor 1 can always be in a suitable working environment during operation, and thus is beneficial to improving the working performance of the motor 1.

[0090] Among them, the spraying angle θ of the spraying device 2 can be specifically 2°, 2.3°, 2.5°, 2.7°, 3°, 3.3°, 3.5°, 3.7°, 4°, 4.3°, 4.5°, 4.7°, 5°, etc.

[0091] When the spraying angle of the spray device 2 is too small (for example, θ is less than 2°), the spraying range of the spray device 2 is too small and the coverage area is too small, so that the cooling oil drips too concentratedly, so that after most of the cooling oil drips on the outer surface of the motor 1, it can only effectively cool down the dripping area, and then the cooling oil after absorbing the heat cannot absorb more heat in the process of sliding down the outer surface of the motor 1, resulting in poor cooling and cooling effects in other areas of the motor 1, thereby making the overall heat dissipation efficiency of the motor 1 low.

[0092] When the spraying angle of the spray device 2 is too large (for example, θ is greater than 5°), the spraying range of the spray device 2 is too large, so that most of the cooling oil cannot drip onto the outer surface of the motor 1, resulting in low utilization rate of the cooling oil during cooling of the motor 1.

[0093] When the spraying angle of the spray device 2 satisfies 2°≤θ≤5°, the spraying range of the spray device 2 is moderate. While ensuring that the sprayed cooling oil drips onto the outer surface of the motor 1, the coverage area of ​​the cooling oil is larger, so that the distribution of the cooling oil on the outer surface of the motor 1 is relatively more uniform, thereby improving the utilization rate of the cooling oil in the process of cooling the motor 1, and improving the overall thermal uniformity of the motor 1, which is beneficial to improving the overall heat dissipation efficiency of the motor 1.

[0094] In a specific embodiment, Figure 3 As shown, each spray assembly includes at least a first spray pipe 23 and a second spray pipe 24, and the first spray pipe 23 and the second spray pipe 24 are symmetrically distributed relative to the center line of the motor 1. Each spray pipe includes at least a first spray area 25 and a second spray area 26, and the first spray area 25 and the second spray area 26 are symmetrically distributed relative to the line connecting each spray pipe and the axis of the motor 1.

[0095] In the embodiment of the present application, the spray device 2 includes a first spray component 21 and a second spray component 22 . The first spray component 21 is used to spray cooling oil on the generator 11 , and the second spray component 22 is used to spray cooling oil on the motor 12 .

[0096] Specifically, the first spray assembly 21 and the second spray assembly 22 each include at least a first spray pipe 23 and a second spray pipe 24. The first spray pipe 23 and the second spray pipe 24 of the first spray assembly 21 are symmetrically distributed relative to the center line of the generator 11, and the first spray pipe 23 and the second spray pipe 24 of the second spray assembly 22 are symmetrically distributed relative to the center line of the motor 12. When the first spray assembly 21 and the second spray assembly 22 spray cooling oil, the cooling oil can be more evenly covered on the outer surface of the generator 11 and the outer surface of the motor 12, which is beneficial to improving the thermal uniformity and heat dissipation efficiency of the generator 11 and the motor 12.

[0097] More specifically, the first spray pipe 23 and the second spray pipe 24 of each spray assembly at least include a first spray area 25 and a second spray area 26 .

[0098] In the first spray assembly 21, the first spray area 25 and the second spray area 26 of the first spray pipe 23 are symmetrically distributed relative to the line connecting the first spray pipe 23 and the axis of the generator 11, and the first spray area 25 and the second spray area 26 of the second spray pipe 24 are symmetrically distributed relative to the line connecting the second spray pipe 24 and the axis of the generator 11, so that the first spray area 25 of the first spray pipe 23 and the first spray area 25 of the second spray pipe 24 can effectively cool down the top of the generator 11, and the second spray area 26 of the first spray pipe 23 and the second spray area 26 of the second spray pipe 24 can effectively cool down the side of the generator 11, which is beneficial to further improve the thermal uniformity of the generator 11.

[0099] In the second spray assembly 22, the first spray area 25 and the second spray area 26 of the first spray pipe 23 are symmetrically distributed relative to the line connecting the first spray pipe 23 and the axis of the motor 12, and the first spray area 25 and the second spray area 26 of the second spray pipe 24 are symmetrically distributed relative to the line connecting the second spray pipe 24 and the axis of the motor 12, so that the first spray area 25 of the first spray pipe 23 and the first spray area 25 of the second spray pipe 24 can effectively cool the top of the motor 12, and the second spray area 26 of the first spray pipe 23 and the second spray area 26 of the second spray pipe 24 can effectively cool the side of the motor 12, which is beneficial to further improve the thermal uniformity of the motor 12.

[0100] Among them, the spraying angle of each first spray area 25 and the spraying angle of each second spray area 26 are both the above-mentioned θ, so that the distribution of the cooling oil on the outer surface of the generator 11 and the outer surface of the motor 12 is relatively more uniform and the contact area is larger, which is beneficial to further improve the heat dissipation efficiency of the generator 11 and the motor 12.

[0101] More specifically, if Figure 3 As shown, taking the generator 11 and the first spray pipe 23 of the first spray assembly 21 as an example, the positions where the first spray pipe 23 is tangent to the outer surface of the generator 11 are A1 and A2, respectively, wherein A1 is the tangent point close to the second spray pipe 24, and A2 is the tangent point far from the second spray pipe 24; on the outer surface of the generator 11, the intersection point of the first spray pipe 23 and the center line of the generator 11 is B1, and the line connecting the first spray pipe 23 and the tangent point A1 and the line connecting the first spray pipe 23 and the intersection point B1 can form a spray angle θ of the first spray area 25 of the generator 11. At the same time, since the first spray area 25 and the second spray area 26 are symmetrically distributed relative to the line connecting the first spray pipe 23 and the axis of the generator 11, the spray angle of the second spray area 26 is also θ, and the farthest position of the second spray area 26 compared to the first spray pipe 23 is the above-mentioned tangent point A2, and the closest position compared to the first spray pipe 23 is Figure 2 B2 in the figure, and B2 is symmetrical to the intersection B1 relative to the line connecting the first spray pipe 23 and the axis of the generator 11.

[0102] Therefore, if Figure 3 As shown, in the embodiment of the generator 11 and the first spray pipe 23, the first spray area 25 is used to spray the top of the generator 11 so that the cooling oil can slide down along the outer surface of the generator 11 to both sides, and the second spray area 26 is used to spray the right side of the generator 11 so that the cooling oil can slide down along the outer surface of the right side of the generator 11, so that the distribution of the cooling oil on the outer surface of the generator 11 is relatively more uniform and has a larger area, so as to improve the heat dissipation effect of the generator 11. Among them, along the height direction of the generator 11, at least part of the first spray area 25 of the first spray pipe 23 is located below the second spray pipe 24, so that part of the cooling oil sprayed by the first spray area 25 can also slide down along the outer surface of the left side of the generator 11, so that the heat dissipation effect on both sides of the generator 11 is more uniform.

[0103] In a specific embodiment, each spray pipe is provided with a plurality of spray holes, and the plurality of spray holes are distributed at intervals along the length direction of the spray pipe, and the distance between two adjacent spray holes is L, and L satisfies 2mm≤L≤20mm.

[0104] In the embodiment of the present application, spray holes are arranged in the first spray area 25 and the second spray area 26 of each spray pipe, and the cooling oil is sprayed onto the outer surface of the motor 1 through the spray holes, wherein each spray pipe is provided with a plurality of spray holes spaced apart along its length direction, and the distance between two adjacent spray holes is L, wherein the distance L between two adjacent spray holes can specifically be 2 mm, 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, etc.

[0105] When the distance between two adjacent spray holes is too small (for example, L is less than 2 mm), the spray holes are distributed more densely, so that the structural strength of the side of each spray pipe with the spray hole is lower; when the distance between two adjacent spray holes is too large (for example, L is greater than 20 mm), the spray holes are distributed more sparsely, so that the contact area between the cooling oil sprayed by each spray pipe and the outer surface of the motor 1 is smaller; when the distance between two adjacent spray holes satisfies 2mm≤L≤20mm, the distribution of the spray holes is more even, which can not only make the side of each spray pipe with the spray hole have a stronger structural strength, but also make the sprayed cooling oil have a larger contact area with the outer surface of the motor 1, so as to improve the cooling effect of the motor 1 while ensuring the structural strength of each spray pipe, thereby improving the heat dissipation efficiency of the motor 1.

[0106] In a specific embodiment, each spray pipe is provided with a first spray hole area and a second spray hole area. Along the length direction of the spray pipe, the second spray hole area is distributed on both sides of the first spray hole area. The first spray hole area is used to spray cooling oil onto the stator core of the motor 1, and the second spray hole area is used to spray cooling oil onto the stator winding of the motor 1.

[0107] The diameter of the spray holes in the first spray hole zone is R1, and R1 satisfies 1mm≤R1≤1.5mm; the diameter of the spray holes in the second spray hole zone is R2, and R2 satisfies 1.5mm≤R2≤2.5mm.

[0108] In the embodiment of the present application, the generator 11 and the motor 12 both include a stator core and a stator winding. The first spray assembly 21 is used to spray cooling oil on the stator core and the stator winding of the generator 11, and the second spray assembly 22 is used to spray cooling oil on the stator core and the stator winding of the motor 12.

[0109] The diameter R1 of the nozzles in the first nozzle area may be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc., and the diameter R2 of the nozzles in the second nozzle area may be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc.

[0110] Since the heat generated by the stator winding is greater than the heat generated by the stator core during operation of the motor 1, the diameter of the spray hole in the second spray hole area is set to be larger than the diameter of the spray hole in the first spray hole area, so that the flow rate of the cooling oil sprayed by the second spray hole area is greater than the flow rate of the cooling oil sprayed by the first spray hole area, so as to improve the cooling effect of the stator winding and improve the heat dissipation efficiency of the stator winding.

[0111] In a possible implementation, when the diameters of the spray holes are consistent, the number of spray holes in the second spray hole area can be set to be greater than the number of spray holes in the first spray hole area, so that the flow rate of the cooling oil sprayed by the second spray hole area is greater than the flow rate of the cooling oil sprayed by the first spray hole area, so as to meet the cooling effect of the stator winding and improve the heat dissipation efficiency of the stator winding.

[0112] In a specific embodiment, Figure 3 As shown, along the height direction of the gearbox, the distance between the spray device 2 and the outer surface of the motor 1 is H, and H satisfies 5mm≤H≤10mm.

[0113] In the embodiment of the present application, the distance H between the spray device 2 and the outer surface of the motor 1 can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.

[0114] When the distance between the spray device 2 and the outer surface of the motor 1 is too small (for example, H is less than 5mm), it is easy to interfere with other components installed in the gearbox, and it is easy to cause oil splashing during the spray device 2 spraying cooling oil; when the distance between the spray device 2 and the outer surface of the motor 1 is too large (for example, H is greater than 10mm), the space occupied by the motor 1 and the spray device 2 in the gearbox is large, resulting in a larger overall volume of the gearbox; when the distance between the spray device 2 and the outer surface of the motor 1 satisfies 5mm≤H≤10mm, the distance between the spray device 2 and the outer surface of the motor 1 is moderate, so that there is a suitable assembly gap between the two while meeting the purpose of reducing the volume of the gearbox.

[0115] In a specific embodiment, Figure 1 As shown, the motor 1 also includes a shaft 13, which is provided with a straight hole and an inclined hole. Along the length direction of the shaft 13, the inclined hole is located on the side of the straight hole close to the end of the shaft 13, and the straight hole and the inclined hole are distributed at intervals along the circumference of the shaft 13.

[0116] In the embodiment of the present application, the motor 1 includes the above-mentioned stator and rotor, the rotor is sleeved on the outer side of the machine shaft 13, and the stator is sleeved on the outer side of the rotor. Along the length direction of the machine shaft 13, the two ends of the machine shaft 13 are connected to the housing of the gearbox through bearings, so that the motor 1 can be installed in the accommodating cavity of the gearbox.

[0117] Among them, the crankshaft 13 is a hollow shaft, and the cooling system also includes a third pipeline and a fourth pipeline. The electronic oil pump 3 is connected to the crankshaft 13 of the generator 11 through the third pipeline, and the electronic oil pump 3 is connected to the crankshaft 13 of the motor 12 through the fourth pipeline, so that the cooling oil flows into the crankshaft 13 under the action of the electronic oil pump 3, so that during the operation of the generator 11 and the motor 12, the cooling oil flows out from the straight holes and inclined holes on the crankshaft 13 by throwing oil.

[0118] Specifically, since the inclined hole is located on the side of the straight hole close to the end of the machine shaft 13 along the length direction of the machine shaft 13, during the rotation of the generator 11 and the motor 12, a part of the cooling oil in the machine shaft 13 cools and lubricates the inner side of the stator winding through the straight hole, and another part of the cooling oil in the machine shaft 13 cools and lubricates the bearings at both ends of the machine shaft 13 through the inclined hole, so that both the generator 11 and the motor 12 can obtain effective cooling and lubrication effects after the vehicle is started, which is beneficial to improve the stability and reliability of the generator 11 and the motor 12 during operation, reduce the degree of wear of the two during operation, and extend the service life of the generator 11 and the motor 12.

[0119] Among them, since the crankshaft 13 is a hollow shaft, the cooling oil can cool the rotors of the generator 11 and the motor 12 by heat exchange after flowing into the crankshaft 13, so as to improve the heat dissipation effect of the rotors. At the same time, the third pipeline and the fourth pipeline can always be in a connected state, which is conducive to improving the smoothness of the cooling oil circulation in the gearbox.

[0120] The embodiment of the present application also provides a gearbox, such as Figure 1 and Figure 2 As shown, the gearbox includes a housing and any of the above cooling systems, wherein the housing has a receiving cavity, the motor 1 and the spray device 2 are both installed in the receiving cavity, and the electronic oil pump 3 and the control device are both installed in the housing.

[0121] In the embodiment of the present application, the shell is also provided with an oil filter 5, an oil cooler 6, a main oil channel 7 and an oil return groove. At least a part of the oil filter 5 is located in the oil return groove, and the oil filter 5 is connected with one end of the electronic oil pump 3. The other end of the electronic oil pump 3 is connected with one end of the oil cooler 6 through the main oil channel 7. The other end of the oil cooler 6 is connected with the first pipeline 31, the second pipeline 32, the third pipeline and the fourth pipeline respectively through the main oil channel 7.

[0122] During the cooling oil circulation process, when the control valve 4 is in the open state, the cooling oil, driven by the electronic oil pump 3, first flows from the return oil tank into the oil filter 5, so that impurities in the cooling oil, such as metal powder generated by wear of various components in the gearbox during operation, can be filtered out through the oil filter 5 to keep the cooling oil flowing into the motor 1 clean, which is beneficial to extending the working life of the gearbox; after the cooling oil to be cleaned flows out of the oil filter 5, it can flow into the oil cooler 6 through the main oil channel 7 driven by the electronic oil pump 3 to cool the cooling oil, so as to achieve a better heat dissipation effect on the motor 1; after the cooling oil to be cooled flows out of the oil cooler 6, it can flow to the first pipeline 31, the second pipeline 32, the third pipeline and the fourth pipeline respectively through the main oil channel 7 driven by the electronic oil pump 3, wherein the cooling oil flowing to the first pipeline 31 can be sprayed on the stator of the generator 11 through the first spray assembly 21, and directly exchange heat with the stator of the generator 11, And under the action of gravity, it slides down to the oil return tank along the outer surface of the stator of the generator 11; the cooling oil flowing to the second pipeline 32 can be sprayed on the stator of the motor 12 through the second spray assembly 22, directly exchange heat with the stator of the motor 12, and slide down to the oil return tank along the outer surface of the stator of the motor 12 under the action of gravity; the cooling oil flowing to the third pipeline can be sprayed on the inner side of the stator winding of the generator 11 and the bearing of the shaft 13 of the generator 11 through the shaft 13 of the generator 11, and this part of the cooling oil will fall back to the oil return tank under the action of gravity after heat exchange; the cooling oil flowing to the fourth pipeline can be sprayed on the inner side of the stator winding of the motor 12 and the bearing of the shaft 13 of the motor 12 through the shaft 13 of the motor 12, and this part of the cooling oil will fall back to the oil return tank under the action of gravity after heat exchange, so as to facilitate the next cooling cycle, thereby meeting the cooling system's demand for cooling the motor 1 and ensuring the working state of the motor 1.

[0123] The embodiment of the present application also provides a cooling system control method for controlling the cooling system described above, such as Figure 3 and Figure 4 As shown, the control method includes:

[0124] Detect the first operating parameter of the generator 11; when the first operating parameter meets the preset condition, control the control valve 4 to open, so that the first spray component 21 is connected to the electronic oil pump 3, and the electronic oil pump 3 is controlled to be at a first speed; when the first operating parameter does not meet the preset condition, control the control valve 4 to close, so that the first spray component 21 is disconnected from the electronic oil pump 3, and the electronic oil pump 3 is controlled to be at a second speed; wherein the first speed is greater than the second speed.

[0125] In the embodiment of the present application, the first detection component is used to detect the first operating parameter of the generator 11 and transmit the detection result to the control device in real time. The control device determines whether the first operating parameter of the generator 11 meets the preset conditions based on the detection result of the first detection component.

[0126] When the control device determines that the first working parameter of the generator 11 meets the preset condition, the control device controls the control valve 4 to open, so that the first spray assembly 21 is connected to the electronic oil pump 3, so as to cool the generator 11 through the first spray assembly 21, improve the heat dissipation effect and lubrication effect of the generator 11, and ensure the stability and reliability of the generator 11 during operation. At the same time, the control device controls the speed of the electronic oil pump 3 to change to the first speed, which is used to speed up the flow speed of the cooling oil in the main oil channel 7 and each pipeline, so as to meet the cooling and lubrication requirements of other components and ensure the stability and reliability of other components during operation.

[0127] When the control device determines that the first operating parameter of the generator 11 does not meet the preset condition, the control device controls the control valve 4 to close, so that the first spray assembly 21 is disconnected from the electronic oil pump 3, so as to cool down other components, improve the heat dissipation and lubrication effects of other components, and ensure the stability and reliability of other components during operation. At the same time, the control device controls the speed of the electronic oil pump 3 to change to the second speed, so as to reduce the energy consumption and wear of the electronic oil pump 3 and improve the energy utilization efficiency.

[0128] Therefore, in this embodiment, by setting the control valve 4 on the first pipeline 31, the first spray assembly 21 is opened or closed, so that when the first working parameter of the generator 11 meets the preset conditions, the control valve 4 is controlled to open, the first pipeline 31 is connected and the rotation speed of the electronic oil pump 3 is increased to meet the cooling and lubrication requirements of the generator 11 and other components, improve the stability and reliability of each component during operation, and improve the overall working performance of the gearbox. When the first working parameter of the generator 11 does not meet the preset conditions, the control valve 4 is controlled to close, the first pipeline 31 is disconnected and the rotation speed of the electronic oil pump 3 is reduced to reduce the energy consumption of the electronic oil pump 3 and improve the energy utilization efficiency.

[0129] In a specific embodiment, Figure 3 and Figure 4 As shown, when the first working parameter meets the preset condition, the control valve 4 is controlled to open, so that the first spray assembly 21 is connected to the electronic oil pump 3, and the electronic oil pump 3 is controlled to be at a first speed, the control method specifically includes:

[0130] When the first working parameter meets the preset condition, the control valve 4 is controlled to open, and the first preset speed is obtained according to the first working parameter; the second working parameter of the motor 12 is detected, and the second preset speed is obtained according to the second working parameter; the first preset speed and the second preset speed are compared, and the maximum value of the two is taken as the first speed.

[0131] In an embodiment of the present application, when the control device determines that the first operating parameter of the generator 11 meets the preset conditions, the control device controls the control valve 4 to open, so that the first spray assembly 21 is connected to the electronic oil pump 3, and a first preset speed is obtained according to the first operating parameter. At the same time, the second detection component is used to detect the second operating parameter of the motor 12, and transmit the detection result to the control device in real time, and obtain the second preset speed according to the second operating parameter of the motor 12; after the control device obtains two preset speeds, the first preset speed and the second preset speed are compared, and the maximum value of the two is taken as the first speed of the electronic oil pump 3.

[0132] Specifically, since there is an additional branch for circulating cooling oil after the control valve 4 is opened, the flow rate of cooling oil originally flowing to other components is reduced, thereby failing to meet the cooling and lubrication needs of other components. Therefore, taking the maximum value of the first preset speed and the second preset speed as the first speed of the electronic oil pump 3 can enable the electronic oil pump 3 to have sufficient driving force to drive the cooling oil to circulate when the control valve 4 is opened, and keep the flow rates in the second pipeline 32, the third pipeline and the fourth pipeline unchanged, thereby ensuring the heat dissipation and lubrication effects of other components, reducing the possibility of a decline in the overall working performance of the motor 1 after the control valve 4 is opened, and improving the stability and reliability of the motor 1 during operation.

[0133] More specifically, if Figure 3 and Figure 4 As shown, when the first working parameter meets the preset condition and the control valve 4 is controlled to be opened, the control method specifically includes: detecting the first working parameter of the generator 11, and querying the first data table according to the first working parameter, and obtaining the first preset speed corresponding to it through the numerical range of the first working parameter in the first data table; detecting the second working parameter of the motor 12, and querying the second data table according to the second working parameter, and obtaining the second preset speed corresponding to it through the numerical range of the second working parameter in the second data table; after the control device obtains two preset speeds, the first preset speed and the second preset speed are compared, and the maximum value of the two is taken as the first speed of the electronic oil pump 3, so that the electronic oil pump 3 can simultaneously meet the cooling and lubrication requirements of the generator 11 and the motor 12.

[0134] In a specific embodiment, Figure 3 and Figure 4As shown, when the first working parameter does not meet the preset condition, the control valve 4 is controlled to close, so that the first spray assembly 21 is disconnected from the electronic oil pump 3, and the electronic oil pump 3 is controlled to be at the second speed. The control method specifically includes:

[0135] When the first operating parameter does not meet the preset condition, the control valve 4 is controlled to close, and the third preset speed is obtained according to the first operating parameter; the second operating parameter of the motor 12 is detected, and the fourth preset speed is obtained according to the second operating parameter; the third preset speed and the fourth preset speed are compared, and the maximum value of the two is taken as the second speed.

[0136] In an embodiment of the present application, when the control device determines that the first operating parameter of the generator 11 does not meet the preset conditions, the control device controls the control valve 4 to close, disconnects the first spray assembly 21 from the electronic oil pump 3, and obtains the third preset speed according to the first operating parameter. At the same time, the second detection device is used to detect the second operating parameter of the motor 12, and transmits the detection result to the control device in real time, and obtains the fourth preset speed according to the second operating parameter of the motor 12; after the control device obtains two preset speeds, the third preset speed and the fourth preset speed are compared, and the maximum value of the two is taken as the second speed of the electronic oil pump 3.

[0137] Specifically, after the control valve 4 is closed, it is necessary to maintain cooling and lubrication of other components. Therefore, taking the maximum value of the third preset speed and the fourth preset speed as the second speed of the electronic oil pump 3 can enable the electronic oil pump 3 to have sufficient driving force to drive the cooling oil to circulate when the control valve 4 is closed, thereby ensuring the heat dissipation and lubrication effects of other components and improving the stability and reliability of the motor 1 during operation.

[0138] Based on this, no matter whether the control valve 4 is opened or not, the electronic oil pump 3 has a sufficient rotation speed to drive the cooling oil circulation to meet the needs of various components, thereby ensuring the stability and reliability of the gearbox during operation.

[0139] More specifically, if Figure 3 and Figure 4As shown, when the first working parameter does not meet the preset condition and the control valve 4 is controlled to be closed, the control method specifically includes: detecting the first working parameter of the generator 11, and querying the first data table according to the first working parameter, and obtaining the third preset speed corresponding to it through the value range of the first working parameter in the first data table; detecting the second working parameter of the motor 12, and querying the third data table according to the second working parameter, and obtaining the fourth preset speed corresponding to it through the value range of the second working parameter in the third data table; after the control device obtains two preset speeds, the third preset speed and the fourth preset speed are compared, and the maximum value of the two is taken as the first speed of the electronic oil pump 3. Among them, the third preset speed can be 0r / min, so that the control device can control the control valve 4 to be closed when the first working parameter of the generator 11 does not meet the preset condition, and use the second working parameter of the motor 12 as the main reference condition for the speed of the electronic oil pump 3, so as to reduce the energy consumption of the electronic oil pump 3 while ensuring the working environment and working state of the motor 12.

[0140] In a specific implementation, the preset conditions are: the operating temperature of the generator 11 is T, and T satisfies T>100° C., and / or, the heating power of the generator 11 is P, and P satisfies P>0.2KW.

[0141] In the embodiment of the present application, when the control valve 4 is in the closed state, the cooling system cools and lubricates the stator and rotor of the generator 11 only through the third pipeline in the form of oil throwing. As the working time and output power of the generator 11 increase, when the working temperature T of the generator 11 is greater than 100°C, and / or the heating power P of the generator 11 is greater than 0.2KW, the cooling system cannot effectively cool the stator and rotor of the generator 11 only through the third pipeline, so that the insulator inside the generator 11 is likely to be damaged, which easily affects the output power of the generator 11. Therefore, when the control device determines that the first working parameter of the generator 11 meets the preset condition, it is necessary to control the control valve 4 to open, so that the first spray assembly 21 is connected to the electronic oil pump 3, and the speed of the electronic oil pump 3 is controlled to increase to the first speed, so as to ensure the heat dissipation and lubrication effects of the generator 12 and other components, reduce the possibility of damage to the generator 11, and improve the stability and reliability of the generator 11 during operation.

[0142] The above describes in detail the structure, features and effects of the present application based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present application, but the present application does not limit the scope of implementation to what is shown in the drawings. Any changes made in accordance with the concept of the present application, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and drawings, should be within the protection scope of the present application.

Claims

1. A cooling system for a gearbox, characterized in that: The cooling system comprises: an electric machine, the electric machine comprising a generator; A spray device, the spray device comprising a first spray assembly, the first spray assembly being used to spray cooling oil onto the generator; An electronic oil pump, the electronic oil pump being connected to the first spray assembly through a first pipeline; Wherein, the first pipeline is provided with a control valve; When the first operating parameter of the generator meets the preset condition, the control valve is in an open state to connect the first pipeline and the speed of the electronic oil pump is at a first speed. When the first operating parameter of the generator does not meet the preset condition, the control valve is in a closed state to disconnect the first pipeline and the speed of the electronic oil pump is at a second speed, and the first speed is greater than the second speed.

2. The cooling system according to claim 1, characterized in that: The motor also includes an electric motor, and the spray device also includes a second spray component. The electronic oil pump is connected to the second spray component through a second pipeline. The electronic oil pump is used to drive the cooling oil to flow along the second pipeline and spray it to the electric motor through the second spray component.

3. The cooling system according to claim 1, characterized in that: The spray device is located above the motor along the height direction of the gearbox, so that the spray range of the spray device covers at least part of the outer surface of the motor; On the outer surface of the motor, the angle between the tangent line of the spray device and the motor and the line connecting the spray device and the center line of the motor is the spraying angle θ of the spray device, and θ satisfies 2°≤θ≤5°.

4. The cooling system according to claim 1, characterized in that: The spray device further includes a second spray assembly, each spray assembly includes at least a first spray pipe and a second spray pipe, and the first spray pipe and the second spray pipe are symmetrically distributed relative to the center line of the motor; Each spray pipe at least includes a first spray area and a second spray area, and the first spray area and the second spray area are symmetrically distributed relative to the line connecting each of the spray pipes and the axis of the motor.

5. The cooling system according to claim 4, characterized in that: Each of the spray pipes is provided with a plurality of spray holes, and the plurality of spray holes are spaced apart and distributed along the length direction of the spray pipe; The distance between two adjacent spray holes is L, and L satisfies 2mm≤L≤20mm.

6. The cooling system according to claim 4, characterized in that: Each of the spray pipes is provided with a first spray hole area and a second spray hole area. Along the length direction of the spray pipe, the second spray hole area is distributed on both sides of the first spray hole area. The first spray hole area is used to spray cooling oil onto the stator core of the motor, and the second spray hole area is used to spray cooling oil onto the stator winding of the motor. The diameter of the spray hole in the first spray hole zone is R1, and R1 satisfies 1mm≤R1≤1.5mm; The diameter of the spray holes in the second spray hole zone is R2, and R2 satisfies 1.5 mm≤R2≤2.5 mm.

7. The cooling system according to any one of claims 1 to 6, characterized in that: Along the height direction of the gearbox, the distance between the spray device and the outer surface of the motor is H, and H satisfies 5mm≤H≤10mm.

8. The cooling system according to any one of claims 1 to 6, characterized in that: The electric machine further comprises an electric motor, the electronic oil pump is connected to the crankshaft of the generator via a third pipeline, and the electronic oil pump is connected to the crankshaft of the electric motor via a fourth pipeline; The machine shaft is a hollow shaft, and is provided with a straight hole and an inclined hole. Along the length direction of the machine shaft, the inclined hole is located on the side of the straight hole close to the end of the machine shaft, and the straight hole and the inclined hole are distributed at intervals along the circumference of the machine shaft.

9. A gearbox, characterized in that: The gearbox comprises: A housing having a receiving cavity; A cooling system, the cooling system being the cooling system according to any one of claims 1 to 8; Wherein, the motor and the spray device are both installed in the accommodating cavity, and the electronic oil pump and the control device are both installed in the shell.

10. A method for controlling a cooling system, used for controlling the cooling system according to any one of claims 1 to 8, characterized in that: The control method comprises: detecting a first operating parameter of the generator; When the first operating parameter meets the preset condition, the control valve is controlled to open, so that the first spray assembly is connected to the electronic oil pump, and the electronic oil pump is controlled to be at a first speed; When the first operating parameter does not meet the preset condition, the control valve is controlled to close, so that the first spray assembly is disconnected from the electronic oil pump, and the electronic oil pump is controlled to be at a second speed; Wherein, the first rotation speed is greater than the second rotation speed.

11. The control method according to claim 10, wherein the motor further comprises an electric motor, characterized in that: When the first working parameter meets the preset condition, the control valve is controlled to open, so that the first spray assembly is connected to the electronic oil pump, and the electronic oil pump is controlled to be at a first speed, the control method specifically includes: When the first operating parameter meets the preset condition, the control valve is controlled to open, and a first preset speed is obtained according to the first operating parameter; detecting a second operating parameter of the motor, and obtaining a second preset speed according to the second operating parameter; The first preset rotational speed and the second preset rotational speed are compared, and the maximum value between the two is taken as the first rotational speed.

12. The control method according to claim 11, characterized in that: When the first operating parameter satisfies the preset condition, the control valve is controlled to open, the first preset speed is obtained according to the first operating parameter, the second operating parameter of the motor is detected, and the second preset speed is obtained according to the second operating parameter, the control method specifically includes: When the first operating parameter meets the preset condition, controlling the control valve to open; Querying a first data table according to the first operating parameter to obtain the first preset speed corresponding to the first operating parameter; A second data table is queried according to the second operating parameter to obtain the second preset rotation speed corresponding to the second operating parameter.

13. The control method according to claim 10, wherein the motor further comprises an electric motor, characterized in that: When the first operating parameter does not meet the preset condition, the control valve is controlled to close, so that the first spray assembly is disconnected from the electronic oil pump, and the electronic oil pump is controlled to be at a second speed, the control method specifically includes: When the first operating parameter does not meet the preset condition, controlling the control valve to close, and obtaining a third preset speed according to the first operating parameter; detecting a second operating parameter of the motor, and obtaining a fourth preset speed according to the second operating parameter; The third preset rotation speed and the fourth preset rotation speed are compared, and the maximum value between the two is taken as the second rotation speed.

14. The control method according to claim 13, characterized in that: When the first operating parameter does not meet the preset condition, the control valve is controlled to be closed, the third preset speed is obtained according to the first operating parameter, the second operating parameter of the motor is detected, and the fourth preset speed is obtained according to the second operating parameter, the control method specifically includes: When the first operating parameter does not meet the preset condition, controlling the control valve to close; Querying a first data table according to the first operating parameter to obtain the third preset speed corresponding to the first operating parameter; According to the second operating parameter, a third data table is searched to obtain the fourth preset speed corresponding to the second operating parameter; Wherein, the third preset rotation speed is 0 r / min.

15. The control method according to any one of claims 10 to 14, characterized in that: The preset conditions are: the operating temperature of the generator is T, and T satisfies T>100° C., and / or the heating power of the generator is P, and P satisfies P>0.2KW.

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