Electric drive assembly lubricating system, control method and vehicle

Abstract

The invention relates to an electric drive assembly lubricating system, a control method and a vehicle. The electric drive assembly lubricating system comprises an oil way and an oil pump arranged in the oil way, the oil way is at least divided into a motor lubricating branch and a speed reducer lubricating branch at an oil outlet of the oil pump, an electric control valve and a heat exchanger are arranged on the motor lubricating branch, and the heat exchanger is used for cooling lubricating oil entering the motor lubricating branch. The electric control valve is used for controlling on-off of at least part of the motor lubricating branches or controlling whether lubricating oil entering the motor lubricating branches is cooled through the heat exchanger or not, and the oil pump is configured to adjust the output oil pumping amount according to the on-off state of the electric control valve. According to the electric drive assembly lubricating system, the oil pumping amount of the oil pump can be correspondingly adjusted according to the actual working condition of the electric drive assembly and the on-off state of the electric control valve, so that flow distribution of lubricating oil is achieved, oil pumping power consumption of the oil pump is reduced, and operation efficiency is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular to an electric drive assembly lubrication system, a control method and a vehicle. Background Art

[0002] The current electric drive assembly lubrication system generally adopts a redundant cooling and lubrication structure with a fixed distribution ratio. There is no active distribution design in the lubrication cooling oil circuit, and it is impossible to control the flow distribution according to the operating status of the vehicle and the electric drive assembly. Redundant lubricating oil is provided to some actuators, which increases the power consumption of the pump oil and the loss of transmission components.

[0003] To solve the above problems, some electric drive assemblies use complex lubrication oil circuits, including proportional electronic control valves, flow control valves, one-way valves, etc. to achieve oil circuit distribution. However, there are many throttling designs in the oil circuit system and the total oil resistance of the system is large, resulting in high power consumption of the pump oil. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure provides an electric drive assembly lubrication system, a control method and a vehicle.

[0005] A first aspect of the present disclosure provides an electric drive assembly lubrication system, comprising an oil circuit and an oil pump disposed in the oil circuit, wherein the oil circuit is divided into at least a motor lubrication branch and a reducer lubrication branch at an oil outlet of the oil pump;

[0006] The motor lubrication branch is provided with an electric control valve and a heat exchanger, the heat exchanger is used to cool the lubricating oil entering the motor lubrication branch, and the electric control valve is used to control the on-off of at least part of the motor lubrication branch, or to control whether the lubricating oil entering the motor lubrication branch is cooled by the heat exchanger;

[0007] The oil pump is configured to adjust the output pump oil volume according to the on-off state of the electric control valve.

[0008] Optionally, the motor lubrication branch includes a motor lubrication main branch, and a stator lubrication branch and a rotor lubrication branch connected to the outlet of the motor lubrication main branch, the heat exchanger is arranged on the motor lubrication main branch, and the electric control valve is arranged on one of the rotor lubrication branch and the motor lubrication main branch.

[0009] Optionally, the electric control valve is arranged on the rotor lubrication branch line;

[0010] The electric control valve is closed when the electric drive assembly is in the first working condition, so that the rotor lubrication branch is in an open circuit state, and the lubricating oil output by the oil pump enters the stator lubrication branch and the reducer lubrication branch;

[0011] The electric control valve is opened when the electric drive assembly is in the second working condition, so that the rotor lubrication branch is in a passage state, and the lubricating oil output by the oil pump enters the stator lubrication branch, the rotor lubrication branch and the reducer lubrication branch.

[0012] Optionally, the electric control valve and the heat exchanger are arranged in parallel on the motor lubrication main branch;

[0013] The electric control valve is opened when the electric drive assembly is in the first working condition, so that the lubricating oil entering the motor lubrication main branch enters the stator lubrication branch and the rotor lubrication branch through the electric control valve;

[0014] The electric control valve is closed when the electric drive assembly is in the second working condition, so that the lubricating oil entering the motor lubrication main branch can enter the stator lubrication branch and the rotor lubrication branch after being cooled by the heat exchanger.

[0015] Optionally, the electric control valve and the heat exchanger are both arranged on the motor lubrication main branch;

[0016] The electric control valve is a reversing valve, and the reversing valve has a reversing valve inlet, a first outlet and a second outlet, the reversing valve inlet is connected to the inlet of the motor lubrication main branch, the first outlet is connected to the heat exchanger, and the second outlet is connected to the outlet of the motor lubrication main branch through a first bypass oil circuit;

[0017] When the electric drive assembly is in the first working condition, the reversing valve inlet is connected to the second outlet, and the lubricating oil entering the motor lubrication main branch enters the first bypass oil path through the second outlet, and enters the stator lubrication branch path and the rotor lubrication branch path through the first bypass oil path;

[0018] When the electric drive assembly is in the second operating condition, the reversing valve inlet is connected to the first outlet, the lubricating oil entering the motor lubrication main branch enters the heat exchanger through the first outlet, and enters the stator lubrication branch and the rotor lubrication branch after being cooled by the heat exchanger.

[0019] Optionally, the electric control valve and the heat exchanger are arranged in series on the motor lubrication main branch;

[0020] The electric control valve is closed when the electric drive assembly is in the first working condition, so that the motor lubrication main branch is in an open circuit state, and the lubricating oil output by the oil pump enters the reducer lubrication branch;

[0021] The electric control valve is opened when the electric drive assembly is in the second working condition, so that the motor lubrication main branch is in a passage state, and the lubricating oil output by the oil pump enters the reducer lubrication branch and the motor lubrication branch.

[0022] Optionally, the electrically controlled valve is a switch solenoid valve;

[0023] Alternatively, the electrically controlled valve is a temperature controlled valve with a temperature sensitive valve core.

[0024] Optionally, a coarse filter is provided in the oil circuit, and the coarse filter is provided at the oil suction port of the oil pump;

[0025] And / or, a fine filter is provided in the oil circuit, and the fine filter is provided at the oil outlet of the oil pump.

[0026] Optionally, a fine filter is provided in the oil circuit, and the fine filter is provided at the oil outlet of the oil pump;

[0027] A second bypass oil circuit is also provided at the fine filter, and a one-way valve is provided on the second bypass oil circuit. The one-way valve is provided in parallel with the fine filter, and the one-way valve is opened when the electric drive assembly is in a first working condition, so that the lubricating oil output by the oil pump enters the motor lubrication branch and the reducer lubrication branch through the one-way valve.

[0028] Optionally, a fine filter is provided in the oil circuit, and the fine filter is provided on the motor lubrication branch circuit and is provided in parallel with the heat exchanger;

[0029] Alternatively, a fine filter is provided in the oil circuit, and the fine filter is provided on the lubrication branch of the reducer.

[0030] Optionally, the reducer lubrication branch includes a bearing lubrication branch and a gear lubrication branch.

[0031] Optionally, the oil circuit is further divided into a transmission disconnect mechanism lubrication branch at the oil outlet of the oil pump.

[0032] A second aspect of the present disclosure provides a control method for an electric drive assembly lubrication system, which is used to control the electric drive assembly lubrication system as described in any one of the above items, and the control method includes:

[0033] Obtain the working condition of the electric drive assembly;

[0034] According to the working condition of the electric drive assembly, the on-off state of the electronically controlled valve is controlled to control the on-off state of at least part of the motor lubrication branch, or to control whether the lubricating oil entering the motor lubrication branch is cooled by the heat exchanger, and the amount of oil pumped by the oil pump is adjusted according to the on-off state of the electronically controlled valve.

[0035] A third aspect of the present disclosure provides a vehicle, comprising an electric drive assembly lubrication system as described in any one of the above.

[0036] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0037] The electric drive assembly lubrication system provided by the present invention includes an oil circuit and an oil pump arranged in the oil circuit, the oil pump is used to pump lubricating oil into the oil circuit, the oil circuit is divided into at least a motor lubrication branch and a reducer lubrication branch at the oil outlet of the oil pump, the lubricating oil entering the motor lubrication branch is used to lubricate and cool the motor, the lubricating oil entering the reducer lubrication branch is used to lubricate and cool the reducer, the motor lubrication branch is provided with an electric control valve and a heat exchanger, the heat exchanger is used to cool the lubricating oil entering the motor lubrication branch, the electric control valve is used to control the on-off of at least part of the motor lubrication branch, or to control whether the lubricating oil entering the motor lubrication branch is cooled by the heat exchanger, and the oil pump is configured to adjust the output pump oil amount according to the on-off state of the electric control valve. With such a configuration, the on and off of some or all of the motor lubrication branches can be controlled by the electric control valve. In this way, when the entire structure or part of the structure of the motor does not need lubrication, at least part of the motor lubrication branch will be disconnected, so that the lubricating oil does not enter part or all of the motor lubrication branch. In this way, the oil pump can reduce the pumping oil amount accordingly to reduce the oil pumping power consumption of the oil pump. Alternatively, the electric control valve can be used to control whether the lubricating oil enters the heat exchanger for cooling, so that the lubricating oil entering the motor and the reducer are respectively in the corresponding optimal operating temperature range, thereby improving the reliability of the system operation, and when there is no need to cool the lubricating oil in the motor lubrication branch, the electric control valve can be used to control the lubricating oil not to enter the heat exchanger, thereby reducing the flow resistance of the lubricating oil and reducing the pumping power consumption. In short, the electric drive assembly lubrication system provided by the present invention can control the on-off of at least part of the motor lubrication branch or whether the lubricating oil needs to be cooled by a heat exchanger through an electric control valve according to the actual working conditions of the electric drive assembly, and then control the oil pump to output different pumping oil amounts accordingly, thereby realizing the flow distribution of the lubricating oil. Compared with controlling the flow of the lubricating oil through a proportional electric control valve or a flow control valve, the electric drive assembly lubrication system provided by the present invention can directly control the on-off of at least part of the motor lubrication branch or whether the lubricating oil needs to pass through a heat exchanger through an electric control valve, thereby reducing the total oil resistance in the oil circuit, thereby reducing the pumping power consumption of the oil pump, improving the operating efficiency of the electric drive assembly lubrication system, and increasing the mileage of pure electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0040] Figure 1 A schematic diagram of a lubrication system for an electric drive assembly according to an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of a lubrication system for an electric drive assembly according to another embodiment of the present invention;

[0042] Figure 3 A schematic diagram of a lubrication system for an electric drive assembly according to another embodiment of the present invention;

[0043] Figure 4 The diagram is a schematic diagram of a lubrication system for an electric drive assembly according to another embodiment of the present invention.

[0044] Reference numerals:

[0045] 1. Oil pan; 2. Coarse filter; 3. Oil pump; 4. Fine filter; 5. Heat exchanger; 6. Electric control valve; 7. Stator lubrication branch; 8. Rotor lubrication branch; 9. Gear lubrication branch; 10. Bearing lubrication branch; 11. Throttle valve. DETAILED DESCRIPTION

[0046] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0048] The electric drive assembly lubrication system, control method and vehicle disclosed in the present invention are described in detail below through specific embodiments:

[0049] Reference Figures 1 to 4 As shown, an electric drive assembly lubrication system provided by one embodiment of the present invention includes an oil circuit and an oil pump 3 arranged in the oil circuit, the oil pump 3 is used to pump lubricating oil into the oil circuit, and the oil circuit is divided into at least a motor lubrication branch and a reducer lubrication branch at the oil outlet of the oil pump 3, the lubricating oil entering the motor lubrication branch is used for lubricating and cooling the motor, and the lubricating oil entering the reducer lubrication branch is used for lubricating and cooling the reducer.

[0050] Furthermore, an electric control valve 6 and a heat exchanger 5 are provided on the motor lubrication branch. The heat exchanger 5 is used to cool the lubricating oil entering the motor lubrication branch. The electric control valve 6 is used to control the on-off state of at least part of the motor lubrication branch, or to control whether the lubricating oil entering the motor lubrication branch is cooled through the heat exchanger 5. The oil pump 3 is configured to adjust the output pump oil volume according to the on-off state of the electric control valve 6.

[0051] In specific implementation, the on and off of some or all of the motor lubrication branches can be controlled by the electric control valve 6. When the motor lubrication branches are connected, the lubricating oil enters some or all of the motor lubrication branches, and the oil pump 3 can increase the oil pumping amount to ensure the lubricating oil amount of some or all of the motor lubrication branches; when the motor lubrication branches are disconnected, the lubricating oil does not enter some or all of the motor lubrication branches, and the oil pump 3 can correspondingly reduce the oil pumping amount to reduce the oil pumping power consumption of the oil pump 3.

[0052] Alternatively, the electric control valve 6 can be used to control whether the lubricating oil enters the heat exchanger 5 for cooling, so that the lubricating oil entering the motor and the reducer are respectively in the corresponding optimal operating temperature range, thereby improving the reliability of system operation. And when there is no need to cool the lubricating oil in the motor lubrication branch, the electric control valve 6 can be used to control the lubricating oil not to enter the heat exchanger 5 for cooling, thereby reducing the flow resistance of the lubricating oil and reducing the power consumption of the pump oil.

[0053] The electric drive assembly lubrication system provided by the present invention can control the on-off of at least part of the motor lubrication branch or whether the lubricating oil needs to be cooled by the heat exchanger 5 through the electric control valve 6 according to the actual working conditions of the electric drive assembly, and then control the oil pump 3 to output different pumping oil amounts accordingly, thereby realizing the flow distribution of the lubricating oil. Compared with controlling the flow of the lubricating oil through a proportional electric control valve or a flow control valve, the electric drive assembly lubrication system provided by the present invention can directly control the on-off of at least part of the motor lubrication branch or whether the lubricating oil needs to pass through the heat exchanger 5 through the electric control valve 6, thereby reducing the total oil resistance in the oil circuit, thereby reducing the pumping power consumption of the oil pump 3, improving the operating efficiency of the electric drive assembly lubrication system, and increasing the mileage of pure electric vehicles.

[0054] It can be understood that under different working conditions, such as the vehicle's cold start at low temperature or the motor's operating temperature is too high, the oil resistance in different oil circuits, such as the motor lubrication branch and the reducer lubrication branch, is also different. The on and off of at least part of the motor lubrication branch is directly controlled by the electronically controlled valve 6. In other words, the lubricating oil can enter the reducer lubrication branch without entering the motor lubrication branch; it can also enter only part of the motor lubrication branch while entering the reducer lubrication branch; it can also enter all of the motor lubrication branches while entering the reducer lubrication branch. Under different states of the electronically controlled valve 6, the total oil resistance in the oil circuit is also different. At the same time, the oil pump is controlled to output different pumping oil volumes to achieve flow distribution of the lubricating oil.

[0055] Alternatively, the electric control valve 6 can also be used to control whether the lubricating oil needs to be cooled through the heat exchanger 5, thereby changing the total oil resistance of the oil circuit. For example, when the electric control valve 6 is opened, the lubricating oil passes through the electric control valve 6 and enters the motor lubrication branch, and no lubricating oil passes through the heat exchanger 5. At this time, the oil resistance of the motor lubrication branch is reduced, thereby reducing the total oil resistance of the oil circuit and reducing the power consumption of the pump oil.

[0056] It should be noted that the optimal operating temperature range of the motor is relatively low, and the optimal operating temperature range of the reducer is relatively high. Therefore, the heat exchanger 5 is set on the motor lubrication branch, and the lubricating oil with a higher temperature enters the motor lubrication branch after being cooled by the heat exchanger 5. At the same time, the lubricating oil entering the motor lubrication branch and the reducer cooling branch eventually flows into the oil pan 1, and is pumped into the oil circuit again through the oil pump 3. When the temperature of the lubricating oil pumped into the oil circuit again is relatively high, after being cooled by the heat exchanger 5, the lubricating oil entering the motor and the reducer can be in the corresponding optimal operating temperature ranges, thereby improving the reliability of the system operation.

[0057] Generally, the oil pump 3 increases the pressure of the lubricating oil under the drive of the power source, so that the lubricating oil obtains the power to overcome the resistance of the oil circuit and flow to the actuator. The power source includes an engine, a driving wheel or an oil pump motor, which transmits the power to the inside of the oil pump 3 through gears, chains, couplings, etc., and drives the oil pump 3 to rotate to provide the electric drive assembly lubrication system with a controllable flow of lubricating oil.

[0058] Specifically, the motor lubrication branch includes a motor lubrication main branch, and a stator lubrication branch 7 and a rotor lubrication branch 8 connected to the outlet of the motor lubrication main branch. That is to say, the outlet of the motor lubrication main branch is divided into a stator lubrication branch 7 and a rotor lubrication branch 8. The heat exchanger 5 is arranged on the motor lubrication main branch to cool down the lubricating oil entering the stator lubrication branch 7 and the rotor lubrication branch 8 at the same time. The electric control valve 6 is arranged on one of the rotor lubrication branch 8 and the motor lubrication main branch.

[0059] It can be understood that when the electric control valve 6 is set on the rotor lubrication branch 8, the heat exchanger 5 is set on the motor lubrication main branch, and the electric control valve 6 can control the on and off of the rotor lubrication branch 8. At this time, after the lubricating oil is cooled by the heat exchanger 5, the electric control valve 6 controls whether the lubricating oil enters the rotor lubrication branch 8, and then the oil pump 3 correspondingly increases or decreases the amount of pumped oil required for rotor lubrication.

[0060] When the electric control valve 6 is set on the main branch of motor lubrication, the electric control valve 6 can control the on and off of the main branch of motor lubrication, and then control whether the lubricating oil enters the main branch of motor lubrication, and then the oil pump 3 correspondingly increases or decreases the amount of pumped oil required for motor lubrication; the electric control valve 6 can also control whether the lubricating oil entering the main branch of motor lubrication is cooled by the heat exchanger 5, so that the lubricating oil entering the motor is maintained within the corresponding optimal operating temperature range.

[0061] It should be noted that the stator lubrication branch circuit 7 includes the motor housing oil circuit, the oil spray ring and the stator core oil circuit, etc. The oil spray ring is connected to the motor housing oil circuit and the stator core oil circuit, and the stator core oil circuit is composed of the lubricating oil channel inside the stator core. When the lubricating oil flowing out of the oil spray ring flows through the inside of the stator, it can take away the heat inside the stator to ensure that the stator temperature is not overheated. Furthermore, the oil spray ring can be designed with an oil spray hole to radially spray the lubricating oil onto the end winding.

[0062] The rotor lubrication branch 8 is composed of the rotor internal oil circuit and the rotor oil-slinging hole. The lubricating oil in the rotor internal oil circuit can take away the heat inside the rotor after being spun out through the rotor oil-slinging hole, thereby ensuring that the rotor temperature is not overheated.

[0063] In some embodiments, reference Figure 1 As shown, the electric control valve 6 is arranged on the rotor lubrication branch line 8 , and the electric control valve 6 can control the on-off of the rotor lubrication branch line 8 .

[0064] Specifically, the electric control valve 6 is closed when the electric drive assembly is in the first operating condition, so that the rotor lubrication branch 8 is in an open circuit state. At this time, the stator lubrication branch 7 and the reducer lubrication branch are in a passage state, and the lubricating oil output by the oil pump 3 enters the stator lubrication branch 7 and the reducer lubrication branch. The oil pump 3 correspondingly reduces the amount of oil pumped required for rotor lubrication, that is, the oil pump 3 correspondingly outputs the amount of oil pumped required for stator and reducer lubrication.

[0065] In specific implementation, the first operating condition may be a condition where the motor does not produce torque, the motor has low torque, or the rotor generates low heat. Under the first operating condition, the rotor lubrication branch 8 is placed in an open circuit state by controlling the electronically controlled valve 6, thereby reducing the amount of oil pumped by the oil pump 3 and reducing the output power consumption of the oil pump 3. At the same time, stopping the supply of lubricating oil inside the rotor can significantly reduce the high-speed oil stirring loss of the rotor and improve the transmission efficiency of the electric drive assembly.

[0066] The electric control valve 6 is opened when the electric drive assembly is in the second working condition, so that the rotor lubrication branch 8 is in a passage state, and the stator lubrication branch 7 and the reducer lubrication branch are also in a passage state. The lubricating oil output by the oil pump 3 enters the stator lubrication branch 7, the rotor lubrication branch 8 and the reducer lubrication branch, and the oil pump 3 correspondingly increases the amount of pumped oil required for rotor lubrication, that is, the oil pump 3 needs to output the amount of pumped oil required for the lubrication of the rotor, stator and reducer.

[0067] The second operating condition may be a condition where the motor has high output power or generates a lot of heat. Under the second operating condition, the electric control valve 6 is controlled to make the rotor lubrication branch 8 in a passage state, and the lubricating oil can enter the interior of the rotor. The lubricating oil is used to achieve the purpose of cooling while lubricating, thereby controlling the temperature level of the motor rotor.

[0068] In other embodiments, referring to Figure 2 As shown, the electric control valve 6 and the heat exchanger 5 are arranged in parallel on the motor lubrication main branch. The electric control valve 6 can control the lubricating oil entering the motor lubrication main branch through the electric control valve 6 to enter the motor lubrication main branch or enter the motor lubrication main branch after being cooled by the heat exchanger 5.

[0069] It can be understood that when the electric control valve 6 and the heat exchanger 5 are arranged in parallel on the main branch of motor lubrication, the lubricating oil can enter the stator lubrication branch 7, the rotor lubrication branch 8 and the reducer lubrication branch, and the oil pump 3 needs to pump the corresponding amount of oil required for the lubrication of the output rotor, stator and reducer.

[0070] In specific implementation, the electric control valve 6 is opened when the electric drive assembly is in the first operating condition, so that the lubricating oil entering the motor lubrication main branch enters the stator lubrication branch 7 and the rotor lubrication branch 8 through the electric control valve 6, and the lubricating oil does not need to pass through the heat exchanger 5 for cooling; at the same time, the reducer lubrication branch is in a passage state, and the lubricating oil can enter the reducer lubrication branch to lubricate and cool the reducer.

[0071] In specific implementation, the first operating condition can be to start the electric drive assembly in a low temperature environment. Under the first operating condition, the electronically controlled valve 6 is opened, the lubricating oil temperature is low and the viscosity is high, and the lubricating oil enters the stator lubrication branch 7 and the rotor lubrication branch 8 through the electronically controlled valve 6. Less lubricating oil flows through the heat exchanger 5, and the heat loss of the motor and the reducer is basically absorbed by the lubricating oil, which is conducive to the rapid heating of the lubricating oil; at the same time, the oil resistance of the motor lubrication branch is reduced, and the lubricating oil flow allocated to the reducer is reduced, which is conducive to reducing the low-temperature drag loss of the reducer.

[0072] The electric control valve 6 is closed when the electric drive assembly is in the second working condition, so that the lubricating oil entering the motor lubrication main branch enters the stator lubrication branch 7 and the rotor lubrication branch 8 after being cooled by the heat exchanger 5. It can be understood that the second working condition is that the lubricating oil temperature is higher than the optimal working temperature range corresponding to the motor. At this time, the lubricating oil is controlled by the electric control valve 6 to enter the heat exchanger 5 for cooling.

[0073] The second working condition may be a condition of rising temperature. Under the second working condition, the temperature of the lubricating oil rises, and the viscosity of the oil decreases exponentially, which greatly reduces the oil stirring loss of the transmission components in the low-temperature stage, improves the efficiency of the low-temperature system, and increases the pure electric driving range in the low-temperature environment. When the lubricating oil absorbs heat and the temperature rises to the target point, the electric control valve 6 is closed, and the lubricating oil in the motor lubrication branch flows through the heat exchanger 5 to dissipate the heat, ensuring the reliable operation of the electric drive assembly.

[0074] In some other embodiments, reference Figure 3 As shown, the electric control valve 6 and the heat exchanger 5 are both arranged on the motor lubrication main branch. Correspondingly, the electric control valve 6 is a reversing valve, which has a reversing valve inlet, a first outlet and a second outlet. The reversing valve inlet is connected to the inlet of the motor lubrication main branch, the first outlet is connected to the heat exchanger 5, and the second outlet is connected to the outlet of the motor lubrication main branch through the first bypass oil circuit. It can be understood that the reversing valve can control the reversing valve to be connected to the heat exchanger 5, and the lubricating oil enters the motor lubrication main branch through the reversing valve and the heat exchanger 5. The reversing valve can also control the reversing valve to be connected to the first bypass oil circuit, and the lubricating oil directly connects to the outlet of the motor lubrication main branch after passing through the reversing valve. At this time, the lubricating oil does not need to enter the heat exchanger 5, and directly enters the stator lubrication branch 7 and the rotor lubrication branch 8 after passing through the reversing valve.

[0075] Specifically, when the electric drive assembly is in the first operating condition, the inlet of the reversing valve is connected to the second outlet, and the lubricating oil entering the motor lubrication main branch enters the first bypass oil circuit through the second outlet, and enters the stator lubrication branch 7 and the rotor lubrication branch 8 through the first bypass oil circuit. The lubricating oil does not need to pass through the heat exchanger 5 for cooling; at the same time, the reducer lubrication branch is in a passage state, and the lubricating oil can enter the reducer lubrication branch to lubricate and cool the reducer.

[0076] In specific implementation, the first operating condition can be to start the electric drive assembly in a low-temperature environment. Under the first operating condition, all the lubricating oil passes through the first bypass oil circuit and does not enter the heat exchanger 5, thereby avoiding heat loss after the heat exchanger 5, so that the lubricating oil can maintain a certain temperature in the low-temperature environment.

[0077] When the electric drive assembly is in the second working condition, the inlet of the reversing valve is connected to the first outlet, and the lubricating oil entering the motor lubrication main branch enters the heat exchanger 5 through the first outlet, and enters the stator lubrication branch 7 and the rotor lubrication branch 8 after being cooled by the heat exchanger 5.

[0078] The second operating condition may be an operating condition of increased temperature. In the second operating condition, the temperature of the lubricating oil is too high. At this time, the lubricating oil in the motor lubrication branch flows through the heat exchanger 5 to dissipate the heat, thereby ensuring the reliable operation of the electric drive assembly.

[0079] Continue to refer to Figure 3As shown, the lubricating oil can enter the stator lubrication branch 7, the rotor lubrication branch 8 and the reducer lubrication branch, and the oil pump 3 needs to output the amount of pumped oil required for the lubrication of the rotor, stator and reducer.

[0080] In some other embodiments, referring to Figure 4 As shown, the electric control valve 6 and the heat exchanger 5 are arranged in series on the motor lubrication main branch, and the electric control valve 6 can control the on-off of the motor lubrication main branch.

[0081] Correspondingly, the electric control valve 6 is closed when the electric drive assembly is in the first operating condition, so that the main branch of motor lubrication is in an open-circuit state, and the lubricating oil output by the oil pump 3 enters the reducer lubrication branch. The oil pump 3 correspondingly reduces the amount of oil pumped required for motor lubrication, that is, the oil pump 3 correspondingly outputs the amount of oil pumped required for reducer lubrication.

[0082] In specific implementation, the first working condition can be the working condition of starting the electric drive assembly or the auxiliary drive motor in the electric drive reverse drag mode in a low temperature environment. Under the first working condition, no lubricating oil passes through the motor lubrication branch, and heat is not dissipated through the heat exchanger 5, which can reduce the rotation drag loss of the motor rotor. The lubricating oil only enters the reducer lubrication branch, which can significantly reduce the demand for pumping oil, thereby reducing the power consumption of the oil pump 3. The oil pump 3 only needs to output a small amount of pumping oil, and the lubricating oil can maintain a higher temperature, so the rotor stirring oil loss, reducer drag loss, and oil pump 3 pumping oil power consumption can be reduced.

[0083] The electric control valve 6 is opened when the electric drive assembly is in the second working condition to make the motor lubrication main branch in a passage state. The electric control valve 6 and the heat exchanger 5 are connected in series on the motor lubrication main branch. The lubricating oil output by the oil pump 3 enters the reducer lubrication branch and the motor lubrication branch. The oil pump 3 increases the amount of oil pumped required for motor lubrication, that is, the oil pump 3 needs to output the amount of oil pumped required for motor and reducer lubrication.

[0084] Correspondingly, the second operating condition may be a condition of elevated temperature. Under the second operating condition, the temperature of the lubricating oil is too high. At this time, the lubricating oil in the motor lubrication branch flows through the heat exchanger 5 to dissipate the heat, thereby ensuring the reliable operation of the electric drive assembly.

[0085] It should be noted that the first working condition and the second working condition are not limited to the above specific limitations, and the function of the electronically controlled valve 6 can be adjusted accordingly according to the actual operating conditions of the system, so that the oil pump 3 can output different pumping oil volumes accordingly.

[0086] In specific implementation, the electric control valve 6 is a switch solenoid valve or a temperature control valve with a temperature-sensitive valve core, so as to realize the on-off of at least part of the motor lubrication branch or whether the lubricating oil needs to be cooled through the heat exchanger 5 through the switch solenoid valve or the temperature control valve. Of course, the selection of the electric control valve 6 is not limited to the above specific limitations, and can be reasonably set according to actual needs.

[0087] Refer to Figures 1 to 4 As shown, a coarse filter 2 and / or a fine filter 4 are provided in the oil circuit. That is to say, either a coarse filter 2 or a fine filter 4 can be provided in the oil circuit, or both a coarse filter 2 and a fine filter 4 can be provided simultaneously. Specifically, it can be reasonably set according to actual requirements.

[0088] In specific implementation, the coarse filter 2 is arranged at the oil suction port of the oil pump 3. The oil suction port of the oil pump 3 is connected to the coarse filter 2. The lubricating oil in the oil sump 1 first enters the coarse filter 2 for primary filtration and then enters the interior of the oil pump 3. It should be noted that the coarse filter 2 can be independently arranged on the oil sump 1 or integrally arranged at the inlet of the oil pump 3. The fine filter 4 is arranged at the oil outlet of the oil pump 3. The oil outlet of the oil pump 3 is connected to the fine filter 4. After the lubricating oil passes through the secondary filtration of the fine filter 4, it enters the rear oil circuit, which can greatly reduce the risk of oil circuit blockage and extend the service life.

[0089] In some embodiments, a fine filter 4 is provided in the oil circuit. The fine filter 4 is arranged at the oil outlet of the oil pump 3. In specific implementation, a second bypass oil circuit is also provided at the fine filter 4. A check valve is provided on the second bypass oil circuit. The check valve is arranged in parallel with the fine filter 4. The check valve opens when the electric drive assembly is in the first working condition, so that the lubricating oil output by the oil pump 3 enters the motor lubrication branch and the reducer lubrication branch through the check valve. It can be understood that the first working condition can be a working condition with high oil resistance at low temperature. In this working condition, when the pressure difference before and after the check valve exceeds the preset pressure, the check valve opens, and the lubricating oil enters the motor lubrication branch and the reducer lubrication branch through the second bypass oil circuit, which can ensure the start of the oil pump 3 at low temperature and reliable flow output.

[0090] In some other embodiments, a fine filter 4 is provided in the oil circuit. The fine filter 4 is arranged on the motor lubrication branch and is arranged in parallel with the heat exchanger 5, or the fine filter 4 is arranged on the reducer lubrication branch to achieve the diversion of different lubricating oil circuits and reduce the total oil resistance of the oil circuit of the system.

[0091] It should be noted that the coarse filter 2 and the fine filter 4 can also be integrated into one body according to the actual cleanliness level of the electric drive assembly lubrication system. The integrated coarse filter 2 and fine filter 4 can be arranged at any position of the oil circuit such as the oil suction port of the oil pump 3, the oil outlet of the oil pump 3, etc. Specifically, it can be reasonably set according to actual requirements.

[0092] In some embodiments, refer to Figures 1 to 4As shown, the reducer lubrication branch includes a bearing lubrication branch 10 and a gear lubrication branch 9. In specific implementation, the bearing lubrication branch 10 and the gear lubrication branch 9 can be divided into active and passive types. The active lubrication branch includes a bearing lubrication throttle hole, a bearing lubrication chamber, a gear lubrication oil circuit and a gear lubrication oil spray hole, etc. The lubricating oil is directly sprayed onto the actuator through a closed branch for lubrication and cooling. The passive lubrication branch includes an oil guide plate, an oil guide groove designed on the outer casing, an oil return groove and a drainage pipe, etc. The oil stirred up by the rotating parts can flow to the actuator position under the action of gravity. Furthermore, in order to realize the closure of the above-mentioned branch, it is usually necessary to design branch connection oil pipes, oil spray pipes, sealing rings and other structures. The oil spray hole structure can be designed on the branch connection oil pipe to lubricate and cool the actuator.

[0093] Specifically, the oil circuit is further divided into a transmission disconnect mechanism lubrication branch at the oil outlet of the oil pump 3, which can lubricate and cool transmission elements such as clutches and transmission gears.

[0094] In some embodiments, a throttle valve 11 is also provided on the stator lubrication branch 7 , the rotor lubrication branch 8 , the bearing lubrication branch 10 and the gear lubrication branch 9 to further improve the flow control of the lubricating oil and reduce the pumping power consumption of the oil pump 3 .

[0095] Some other embodiments of the present disclosure provide a control method for an electric drive assembly lubrication system, which is used to control the electric drive assembly lubrication system of any of the above embodiments, and the control method includes:

[0096] Obtain the working condition of the electric drive assembly;

[0097] According to the working condition of the electric drive assembly, the on-off state of the electronically controlled valve 6 is controlled to control the on-off state of at least part of the motor lubrication branch, or to control whether the lubricating oil entering the motor lubrication branch is cooled by the heat exchanger 5, and the amount of oil pumped by the oil pump 3 is adjusted according to the on-off state of the electronically controlled valve 6.

[0098] That is to say, the control method of the electric drive assembly lubrication system disclosed in the present invention can control the on-off state of the electronically controlled valve 6 according to the actual working condition of the electric drive assembly, and control the change of the oil pumping amount output by the oil pump 3 according to the on-off state of the electronically controlled valve 6. Specifically, the electronically controlled valve 6 can control the on-off state of at least part of the motor lubrication branch or whether the lubricating oil needs to be cooled by the heat exchanger 5. Correspondingly, the oil circuit requires different oil pumping amounts of lubricating oil. In this way, the flow distribution of the lubricating oil is achieved through the control method. At the same time, by controlling the on-off state of part or all of the motor lubrication branches and whether the lubricating oil is cooled by the heat exchanger 5, the total oil resistance in the oil circuit can be reduced, thereby reducing the oil pumping power consumption of the oil pump 3, improving the operating efficiency of the electric drive assembly lubrication system, and increasing the mileage of pure electric vehicles.

[0099] Other embodiments of the present disclosure further provide a vehicle, comprising an electric drive assembly lubrication system as described in any of the above embodiments.

[0100] The vehicle provided in the embodiment of the present disclosure includes the electric drive assembly lubrication system of any of the above embodiments, and thus has the beneficial effects of the electric drive assembly lubrication system of any of the above embodiments, which will not be elaborated here.

[0101] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0102] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electric drive assembly lubrication system, It is characterized in that It comprises an oil circuit and an oil pump arranged in the oil circuit, wherein the oil circuit is divided into at least a motor lubrication branch and a reducer lubrication branch at an oil outlet of the oil pump; The motor lubrication branch is provided with an electric control valve and a heat exchanger, the heat exchanger is used to cool the lubricating oil entering the motor lubrication branch, and the electric control valve is used to control the on-off of at least part of the motor lubrication branch, or to control whether the lubricating oil entering the motor lubrication branch is cooled by the heat exchanger; The oil pump is configured to adjust the output pump oil volume according to the on-off state of the electric control valve.

2. The electric drive assembly lubrication system according to claim 1, It is characterized in that The motor lubrication branch includes a motor lubrication main branch, and a stator lubrication branch and a rotor lubrication branch connected to the outlet of the motor lubrication main branch. The heat exchanger is arranged on the motor lubrication main branch, and the electric control valve is arranged on one of the rotor lubrication branch and the motor lubrication main branch.

3. The electric drive assembly lubrication system according to claim 2, It is characterized in that The electric control valve is arranged on the rotor lubrication branch line; The electric control valve is closed when the electric drive assembly is in the first working condition, so that the rotor lubrication branch is in an open circuit state, and the lubricating oil output by the oil pump enters the stator lubrication branch and the reducer lubrication branch; The electric control valve is opened when the electric drive assembly is in the second working condition, so that the rotor lubrication branch is in a passage state, and the lubricating oil output by the oil pump enters the stator lubrication branch, the rotor lubrication branch and the reducer lubrication branch.

4. The electric drive assembly lubrication system according to claim 2, It is characterized in that The electric control valve and the heat exchanger are arranged in parallel on the motor lubrication main branch; The electric control valve is opened when the electric drive assembly is in the first working condition, so that the lubricating oil entering the motor lubrication main branch enters the stator lubrication branch and the rotor lubrication branch through the electric control valve; The electric control valve is closed when the electric drive assembly is in the second working condition, so that the lubricating oil entering the motor lubrication main branch can enter the stator lubrication branch and the rotor lubrication branch after being cooled by the heat exchanger.

5. The electric drive assembly lubrication system according to claim 2, It is characterized in that The electric control valve and the heat exchanger are both arranged on the motor lubrication main branch; The electric control valve is a reversing valve, and the reversing valve has a reversing valve inlet, a first outlet and a second outlet, the reversing valve inlet is connected to the inlet of the motor lubrication main branch, the first outlet is connected to the heat exchanger, and the second outlet is connected to the outlet of the motor lubrication main branch through a first bypass oil circuit; When the electric drive assembly is in the first working condition, the reversing valve inlet is connected to the second outlet, and the lubricating oil entering the motor lubrication main branch enters the first bypass oil path through the second outlet, and enters the stator lubrication branch path and the rotor lubrication branch path through the first bypass oil path; When the electric drive assembly is in the second operating condition, the reversing valve inlet is connected to the first outlet, the lubricating oil entering the motor lubrication main branch enters the heat exchanger through the first outlet, and enters the stator lubrication branch and the rotor lubrication branch after being cooled by the heat exchanger.

6. The electric drive assembly lubrication system according to claim 2, It is characterized in that The electric control valve and the heat exchanger are arranged in series on the motor lubrication main branch; The electric control valve is closed when the electric drive assembly is in the first working condition, so that the motor lubrication main branch is in an open circuit state, and the lubricating oil output by the oil pump enters the reducer lubrication branch; The electric control valve is opened when the electric drive assembly is in the second working condition, so that the motor lubrication main branch is in a passage state, and the lubricating oil output by the oil pump enters the reducer lubrication branch and the motor lubrication branch.

7. The electric drive assembly lubrication system according to any one of claims 1 to 6, It is characterized in that The electric control valve is a switch solenoid valve; Alternatively, the electrically controlled valve is a temperature controlled valve with a temperature sensitive valve core.

8. The electric drive assembly lubrication system according to any one of claims 1 to 6, It is characterized in that A coarse filter is provided in the oil circuit, and the coarse filter is provided at the oil suction port of the oil pump; And / or, a fine filter is provided in the oil circuit, and the fine filter is provided at the oil outlet of the oil pump.

9. The electric drive assembly lubrication system according to any one of claims 1 to 6, It is characterized in that A fine filter is provided in the oil circuit, and the fine filter is provided at the oil outlet of the oil pump; A second bypass oil circuit is also provided at the fine filter, and a one-way valve is provided on the second bypass oil circuit. The one-way valve is provided in parallel with the fine filter, and the one-way valve is opened when the electric drive assembly is in a first working condition, so that the lubricating oil output by the oil pump enters the motor lubrication branch and the reducer lubrication branch through the one-way valve.

10. The electric drive assembly lubrication system according to any one of claims 1 to 6, It is characterized in that A fine filter is provided in the oil circuit, and the fine filter is provided on the motor lubrication branch circuit and is provided in parallel with the heat exchanger; Alternatively, a fine filter is provided in the oil circuit, and the fine filter is provided on the lubrication branch of the reducer.

11. The electric drive assembly lubrication system according to any one of claims 1 to 6, It is characterized in that The reducer lubrication branch includes a bearing lubrication branch and a gear lubrication branch.

12. The electric drive assembly lubrication system according to any one of claims 1 to 6, It is characterized in that The oil circuit is further divided into a transmission disconnect mechanism lubrication branch circuit at the oil outlet of the oil pump.

13. A control method for a lubrication system of an electric drive assembly, It is characterized in that Used to control the electric drive assembly lubrication system according to any one of claims 1 to 12, the control method comprising: Obtain the working condition of the electric drive assembly; According to the working condition of the electric drive assembly, the on-off state of the electronically controlled valve is controlled to control the on-off state of at least part of the motor lubrication branch, or to control whether the lubricating oil entering the motor lubrication branch is cooled by the heat exchanger, and the amount of oil pumped by the oil pump is adjusted according to the on-off state of the electronically controlled valve.

14. A vehicle, It is characterized in that Comprising the electric drive assembly lubrication system as claimed in any one of claims 1 to 12.

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