Lubrication system for vehicle differential and control method thereof

Abstract

The invention relates to the technical field of vehicle driving, in particular to a lubricating system for a vehicle differential mechanism and a control method of the lubricating system, the lubricating system is used for lubricating the differential mechanism, the lubricating system comprises a splashing oil way, an oil pan and a gear are arranged on the splashing oil way, and the splashing oil way is used for supplying oil to the differential mechanism; an oil pan, an oil pump and a switch valve are arranged on the driving oil way; the microcontroller unit is used for confirming working conditions based on the state information of the vehicle, the working conditions comprise the first working condition and the second working condition, the microcontroller unit is used for controlling the active oil way to stop supplying oil to the differential mechanism under the first working condition, and the microcontroller unit is used for controlling the active oil way to supply oil to the differential mechanism under the second working condition. The lubricating requirements of the differential mechanism can be met under different working conditions.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle driving technology, and in particular to a lubrication system for a vehicle differential and a control method thereof. Background Art

[0002] At present, new energy electric vehicles are becoming more and more popular, and new energy vehicles on the track has become a popular trend. Track conditions involve drift conditions, and the lubrication requirements and implementation of differentials are crucial.

[0003] In the prior art, differential lubrication mostly relies on splash lubrication. During large inclination angles and extreme drifting, the differential is prone to insufficient lubrication, leading to problems such as ablation. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure provides a lubrication system for a vehicle differential and a control method thereof, which can meet the lubrication requirements of the differential under different working conditions.

[0005] In a first aspect, an embodiment of the present disclosure provides a lubrication system for a vehicle differential, which is used to lubricate the differential, and the lubrication system includes: a splash oil circuit, an oil pan and a gear are provided on the splash oil circuit, and the splash oil circuit is used to supply oil to the differential; an active oil circuit, an oil pan, an oil pump and a switch valve are provided on the active oil circuit; a microcontroller unit, and the microcontroller unit is used to confirm the operating condition based on the status information of the vehicle, wherein the operating condition includes a first operating condition and a second operating condition, and in the first operating condition, the microcontroller unit is used to control the active oil circuit to stop supplying oil to the differential, and in the second operating condition, the microcontroller unit is used to control the active oil circuit to supply oil to the differential.

[0006] In some embodiments, the lubrication system further includes a water cooling circuit, wherein the water cooling circuit and the active oil circuit are both connected to a heat exchanger, and the heat exchanger is used to perform heat exchange between the liquid in the water cooling circuit and the liquid in the active oil circuit.

[0007] In some embodiments, the active oil circuit is connected to the motor oil circuit, the active oil circuit and the motor oil circuit are connected to the same oil pan and the same oil pump, and the motor oil circuit is used to lubricate the motor.

[0008] In some embodiments, a filter press is further provided on the active oil circuit, and the filter press is used to filter the liquid in the active oil circuit.

[0009] In a second aspect, the present disclosure also provides a control method for a lubrication system of a vehicle differential, the control method comprising: confirming an operating condition based on status information of the vehicle, the operating condition comprising a first operating condition and a second operating condition; in the first operating condition, supplying oil to the differential through a splash oil circuit, and an oil pan and gears are provided on the splash oil circuit; in the second operating condition, supplying oil to the differential through the splash oil circuit, and supplying oil to the differential through an active oil circuit, and an oil pan, an oil pump and a switch valve are provided on the active oil circuit.

[0010] In some embodiments, confirming the operating condition based on the vehicle's status information includes: acquiring the vehicle's status information, the status information including the differential rate and the power demand; when the differential rate is less than or equal to a first threshold and the power demand is less than or equal to a second threshold, confirming the operating condition as the first operating condition; when the differential rate is greater than the first threshold and the power demand is greater than the second threshold, confirming the operating condition as the second operating condition.

[0011] In some embodiments, the power demand includes torque. When the differential rate is less than or equal to a first threshold and the torque is less than or equal to a third threshold, the operating condition is confirmed to be the first operating condition; when the differential rate is greater than the first threshold and the torque is greater than the third threshold, the operating condition is confirmed to be the second operating condition; or, the power demand includes power. When the differential rate is less than or equal to the first threshold and the power is less than or equal to a fourth threshold, the operating condition is confirmed to be the first operating condition; when the differential rate is greater than the first threshold and the power is greater than the fourth threshold, the operating condition is confirmed to be the second operating condition.

[0012] In some embodiments, supplying oil to the differential through the splash oil circuit includes: starting the gear and splashing the lubricating oil in the oil pan to the differential through the gear.

[0013] In some embodiments, supplying oil to the differential through the active oil circuit includes: starting an oil pump and a switch valve, and pumping lubricating oil in the oil pan to the differential through the oil pump and the switch valve.

[0014] In some embodiments, the control method further includes: in the second operating condition, adjusting the rotation speed of the oil pump and the opening degree of the switch valve based on the status information of the vehicle.

[0015] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0016] The lubrication system provided by the present disclosure includes a splash oil circuit, an active oil circuit and a microcontroller unit, wherein an oil pan and a gear are provided on the splash oil circuit, an oil pan, an oil pump and a switch valve are provided on the active oil circuit, and both the splash oil circuit and the active oil circuit can supply oil to the differential. The microcontroller unit can confirm the working condition according to the state information of the vehicle, wherein the working condition includes a first working condition and a second working condition. The first working condition is a daily working condition, at which the lubrication demand of the differential is not high, so that in the first working condition, the differential can be supplied with oil through the splash oil circuit, and the microcontroller unit controls the active oil circuit to stop supplying oil to the differential, at which time, while meeting the lubrication demand of the differential, it is conducive to achieving low power consumption. The second working condition is a racing working condition, at which the lubrication demand of the differential is high, so that in the second working condition, while the differential is supplied with oil through the splash oil circuit, the microcontroller unit controls the active oil circuit to supply oil to the differential, thereby meeting the large lubrication demand of the differential, thereby better protecting the differential and achieving the extreme drifting ability of the vehicle. That is, the lubrication system disclosed in the present invention can meet the lubrication requirements of the differential under different working conditions while being conducive to achieving low power consumption, thereby facilitating achieving a balance between vehicle mobility and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] 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.

[0019] Figure 1 is a structural schematic diagram of a lubrication system for a vehicle differential provided by the present disclosure;

[0020] Figure 2 is a structural schematic diagram of a differential provided by the present disclosure;

[0021] Figure 3 is a flow chart of a control method for a lubrication system of a vehicle differential provided by the present disclosure;

[0022] Figure 4 It is a flow chart of step S10 in the control method provided by the present disclosure. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] Figure 1 is a structural schematic diagram of a lubrication system for a vehicle differential provided by the present disclosure, with reference to Figure 1 This embodiment provides a lubrication system for a vehicle differential, which is used to lubricate the differential 32. The lubrication system includes:

[0026] A splash oil circuit 10, on which an oil pan 31 and a gear are disposed, and the splash oil circuit 10 is used to supply oil to a differential 32;

[0027] Active oil circuit 20, on which an oil pan 31, an oil pump 33 and a switch valve 34 are arranged;

[0028] The microcontroller unit MCU is used to confirm the operating condition based on the status information of the vehicle, wherein the operating condition includes a first operating condition and a second operating condition. In the first operating condition, the microcontroller unit MCU is used to control the active oil circuit 20 to stop supplying oil to the differential 32. In the second operating condition, the microcontroller unit MCU is used to control the active oil circuit 20 to supply oil to the differential 32.

[0029] Specifically, the present embodiment provides a lubrication system for a vehicle differential, and the lubrication system is used to provide lubricating oil to the differential 32 during the driving of the vehicle, so as to lubricate the differential 32 during the driving of the vehicle.

[0030] Optionally, in the embodiments of the present disclosure, the vehicle includes but is not limited to an electric vehicle (EV), a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle (NewEnergy Vehicle), etc. Preferably, the vehicle is a pure electric vehicle.

[0031] The lubrication system provided in this embodiment includes a splash oil circuit 10, an active oil circuit 20 and a microcontroller unit MCU, wherein an oil pan 31 and gears are provided on the splash oil circuit 10, and an oil pan 31, an oil pump 33 and a switch valve 34 are provided on the active oil circuit 20. The oil pan 31 is used to store lubricating oil. The rotation of the gears in the splash oil circuit 10 causes the lubricating oil in the oil pan 31 to splash to the differential 32. The lubricating oil in the oil pan 31 is pumped to the differential 32 by the oil pump 33 and the switch valve 34 in the active oil circuit 20, so that both the splash oil circuit 10 and the active oil circuit 20 can supply oil to the differential 32.

[0032] The microcontroller unit MCU can confirm the working condition according to the state information of the vehicle, wherein the working condition includes a first working condition and a second working condition. The first working condition is a daily working condition, at which time, the lubrication demand of the differential 32 is not high, so that in the first working condition, the differential 32 can be supplied with oil through the splash oil circuit 10, and the microcontroller unit MCU controls the active oil circuit 20 to stop supplying oil to the differential 32. At this time, while meeting the lubrication demand of the differential 32, it is conducive to achieving low power consumption. The second working condition is a racing working condition, at this time, the lubrication demand of the differential 32 is high, so that in the second working condition, while supplying oil to the differential 32 through the splash oil circuit 10, the microcontroller unit MCU controls the active oil circuit 20 to supply oil to the differential 32, thereby meeting the large lubrication demand of the differential 32, thereby better protecting the differential 32 and achieving the extreme drifting ability of the vehicle. That is, the lubrication system provided in this embodiment can meet the lubrication demand of the differential 32 under different working conditions, while being conducive to achieving low power consumption, thereby facilitating achieving a balance between vehicle mobility and economy.

[0033] Exemplary, combined Figure 1 and Figure 2 , Figure 2 1 is a structural schematic diagram of a differential provided by the present disclosure, wherein the differential 32 includes an oil collecting pan 321, an oil inlet channel 322 and a pin 323. When the differential 32 is supplied with oil through the splash oil circuit 10, the gear in the splash oil circuit 10 can be started, and the lubricating oil in the oil pan 31 is splashed to the oil collecting pan 321 in the differential 32 through the rotation of the gear, and the lubricating oil enters the oil inlet channel 322 through the oil collecting pan 321, and then enters the pin 323 through the oil inlet channel 322, thereby achieving lubrication of the pin 323. In the second working condition, the oil pump 33 and the switch valve 34 in the active oil circuit 20 can be started, and the lubricating oil in the oil pan 31 is pumped to the oil collecting pan 321 in the differential 32 through the oil pump 33 and the switch valve 34, and the lubricating oil enters the oil inlet channel 322 through the oil collecting pan 321, and then enters the pin 323 through the oil inlet channel 322, thereby achieving lubrication of the pin 323.

[0034] It should be noted that Figure 2A structure of a differential is exemplarily shown in FIG. 1 . In other embodiments of the present disclosure, the differential may also have other structures, which will not be described in detail herein.

[0035] Continue to refer Figure 1 In some optional embodiments, the lubrication system further includes a water cooling circuit 40 , and the water cooling circuit 40 and the active oil circuit 20 are both connected to a heat exchanger 36 , and the heat exchanger 36 is used to perform heat exchange between the liquid in the water cooling circuit 40 and the liquid in the active oil circuit 20 .

[0036] Specifically, the lubrication system also includes a water cooling circuit 40, and the water cooling circuit 40 and the active oil circuit 20 are both connected to the heat exchanger 36, so that the heat exchanger 36 can perform heat exchange between the liquid in the water cooling circuit 40 and the liquid in the active oil circuit 20, thereby achieving heat dissipation of the lubricating oil in the active oil circuit 20, so that in the second working condition, the active oil circuit 20 can dissipate the heat generated by the differential 32, thereby better protecting the differential 32 and achieving the vehicle's extreme drift capability.

[0037] It should be noted that the specific structure of the water cooling circuit 40 can be set according to actual needs, and the present disclosure will not elaborate on it here.

[0038] Continue to refer Figure 1 In some optional embodiments, the active oil circuit 20 is connected to the motor oil circuit 60 , and the active oil circuit 20 and the motor oil circuit 60 are connected to the same oil pan 31 and the same oil pump 33 , and the motor oil circuit 60 is used to lubricate the motor 61 .

[0039] Specifically, the vehicle is also provided with a motor oil circuit 60, which can lubricate the motor 61. The active oil circuit 20 and the motor oil circuit 60 share the same oil pan 31 and the same oil pump 33, that is, the vehicle is provided with an oil circuit for transmitting lubricating oil, and the active oil circuit 20 can be formed by adding an oil circuit branch in the oil circuit, which is conducive to reducing production costs.

[0040] Continue to refer Figure 1 In some optional embodiments, a filter press 35 is further provided on the active oil circuit 20 , and the filter press 35 is used to filter the liquid in the active oil circuit 20 , that is, the filter press 35 can filter the lubricating oil in the active oil circuit 20 .

[0041] It should be noted that in other embodiments of the present disclosure, other components may be provided on the active oil circuit 20, which will not be described in detail herein.

[0042] Figure 3 is a flow chart of a control method for a lubrication system of a vehicle differential provided by the present disclosure, with reference to Figure 3This embodiment provides a control method for a lubrication system of a vehicle differential, the control method comprising:

[0043] Step S10, confirming the operating condition based on the vehicle status information, the operating condition including a first operating condition and a second operating condition;

[0044] Step S20, in the first working condition, supplying oil to the differential through a splash oil circuit, wherein an oil pan and a gear are provided on the splash oil circuit;

[0045] Step S30: In the second working condition, the differential is supplied with oil through the splash oil circuit, and the differential is supplied with oil through the active oil circuit, and the active oil circuit is provided with an oil pan, an oil pump and a switch valve.

[0046] Specifically, refer to Figure 1 and Figure 3 The control method for the lubrication system of the vehicle differential provided in this embodiment is applied to the lubrication system of the vehicle differential provided in the embodiment of the present disclosure, and the lubrication system is used to provide lubricating oil to the differential 32 during the driving of the vehicle, so as to lubricate the differential 32 during the driving of the vehicle.

[0047] The lubrication system provided in this embodiment includes a splash oil circuit 10, an active oil circuit 20 and a microcontroller unit MCU, wherein an oil pan 31 and gears are provided on the splash oil circuit 10, and an oil pan 31, an oil pump 33 and a switch valve 34 are provided on the active oil circuit 20. The oil pan 31 is used to store lubricating oil. The rotation of the gears in the splash oil circuit 10 causes the lubricating oil in the oil pan 31 to splash to the differential 32. The lubricating oil in the oil pan 31 is pumped to the differential 32 by the oil pump 33 and the switch valve 34 in the active oil circuit 20, so that both the splash oil circuit 10 and the active oil circuit 20 can supply oil to the differential 32.

[0048] In the control method for the lubrication system of the vehicle differential provided in the present embodiment, the working condition can be confirmed according to the state information of the vehicle, wherein the working condition includes the first working condition and the second working condition. The first working condition is the daily working condition, at which the lubrication demand of the differential 32 is not high, so in the first working condition, the differential 32 is supplied with oil through the splash oil circuit 10, and the active oil circuit 20 is controlled to stop supplying oil to the differential 32, at which time, while meeting the lubrication demand of the differential 32, it is conducive to achieving low power consumption. The second working condition is the racing working condition, at which the lubrication demand of the differential 32 is high, so in the second working condition, while supplying oil to the differential 32 through the splash oil circuit 10, the active oil circuit 20 is controlled to supply oil to the differential 32, so that the large lubrication demand of the differential 32 can be met, so that the differential 32 can be better protected and the extreme drifting ability of the vehicle can be achieved. That is, the control method provided in the present embodiment can meet the lubrication demand of the differential 32 under different working conditions, while being conducive to achieving low power consumption, thereby facilitating the balance between vehicle mobility and economy.

[0049] Figure 4 is a flow chart of step S10 in the control method provided by the present disclosure, refer to Figure 4 In some optional embodiments, step S10, confirming the working condition based on the vehicle status information, includes:

[0050] Step S11, obtaining vehicle status information, the status information including differential speed and power demand;

[0051] Step S12: when the differential rate is less than or equal to the first threshold and the power demand is less than or equal to the second threshold, confirm that the operating condition is the first operating condition; when the differential rate is greater than the first threshold and the power demand is greater than the second threshold, confirm that the operating condition is the second operating condition.

[0052] Specifically, refer to Figure 1 , Figure 3 and Figure 4 , the microcontroller unit MCU is connected to the chassis domain and the vehicle control unit VCU in communication, the microcontroller unit MCU can obtain the differential rate through the chassis domain, and the microcontroller unit MCU can obtain the power demand through the vehicle control unit VCU, so that the microcontroller unit MCU can confirm the working condition of the vehicle based on the differential rate and the power demand. Specifically, when the differential rate is less than or equal to the first threshold value, and the power demand is less than or equal to the second threshold value, at this time, the vehicle is in a low differential rate and low power demand mode, and the working condition is confirmed to be the first working condition; when the differential rate is greater than the first threshold value, and the power demand is greater than the second threshold value, at this time, the vehicle is in a medium-high differential rate and medium-high power demand mode, and the working condition is confirmed to be the second working condition, which is conducive to accurately confirming whether the vehicle is in the first working condition or the second working condition. Therefore, in the first working condition, the microcontroller unit MCU can control the active oil circuit 20 to stop supplying oil to the differential 32. At this time, while meeting the lubrication demand of the differential 32, it is conducive to achieving low power consumption. In the second working condition, the microcontroller unit MCU controls the active oil circuit 20 to supply oil to the differential 32, thereby meeting the large lubrication demand of the differential 32, thereby better protecting the differential 32 and realizing the extreme drifting capability of the vehicle. That is, based on the differential rate and power demand, the control can be selected to supply oil to the differential 32 through the splash oil circuit 10 or to supply oil to the differential 32 through the active oil circuit 20, thereby meeting the lubrication demand of the differential 32 under different working conditions.

[0053] It should be noted that the first threshold and the second threshold can be set to different values ​​according to different vehicles, and the present disclosure does not make specific limitations on this.

[0054] In some optional embodiments, the power demand includes torque or power. The vehicle operating condition can be determined based on the differential speed and torque demand, or based on the differential speed and power demand.

[0055] Specifically, when the power demand includes torque, when the differential rate is less than or equal to the first threshold and the torque is less than or equal to the third threshold, the vehicle is in a low differential rate and low torque mode, and the operating condition is confirmed to be the first operating condition; when the differential rate is greater than the first threshold and the torque is greater than the third threshold, the vehicle is in a medium-high differential rate and medium-high torque mode, and the operating condition is confirmed to be the second operating condition.

[0056] When the power demand includes power, when the differential rate is less than or equal to the first threshold and the power is less than or equal to the fourth threshold, the vehicle is in a low differential rate and low power mode, and the operating condition is confirmed to be the first operating condition; when the differential rate is greater than the first threshold and the power is greater than the fourth threshold, the vehicle is in a medium-high differential rate and medium-high power mode, and the operating condition is confirmed to be the second operating condition.

[0057] It should be noted that the third threshold and the fourth threshold can be set to different values ​​according to different vehicles, and the present disclosure does not make specific limitations on this.

[0058] In some optional embodiments, supplying oil to the differential through the splash oil circuit includes:

[0059] Start the gear and splash the lubricating oil in the oil pan to the differential through the gear.

[0060] Specifically, refer to Figure 1 and Figure 3 In the lubrication system provided in the present embodiment, an oil pan 31 and a gear are provided on the splash oil circuit 10. The oil pan 31 is used to store lubricating oil. The rotation of the gear in the splash oil circuit 10 causes the lubricating oil in the oil pan 31 to splash to the differential 32. In the first working condition and the second working condition, the gear in the splash oil circuit 10 can be started, and the lubricating oil in the oil pan 31 is splashed to the differential 32 through the rotation of the gear, thereby achieving lubrication of the differential 32.

[0061] In some optional embodiments, supplying oil to the differential through the active oil circuit includes:

[0062] Start the oil pump and the switch valve to pump the lubricating oil in the oil pan to the differential through the oil pump and the switch valve.

[0063] Specifically, refer to Figure 1 and Figure 3In the lubrication system provided in this embodiment, an oil pan 31, an oil pump 33 and a switch valve 34 are provided on the active oil circuit 20. The oil pan 31 is used to store lubricating oil. The lubricating oil in the oil pan 31 is pumped to the differential 32 by the oil pump 33 and the switch valve 34 in the active oil circuit 20. In the first working condition, the oil pump 33 and the switch valve 34 in the active oil circuit 20 can be stopped, so that the active oil circuit 20 stops supplying oil to the differential 32. In the second working condition, the oil pump 33 and the switch valve 34 in the active oil circuit 20 can be started, and the lubricating oil in the oil pan 31 is pumped to the differential 32 by the oil pump 33 and the switch valve 34, so as to lubricate the differential 32.

[0064] In some optional embodiments, the control method further includes:

[0065] In the second operating condition, the speed of the oil pump and the opening of the switch valve are adjusted based on the status information of the vehicle.

[0066] Continue to refer Figure 1 In the second working condition, the oil pump 33 and the switch valve 34 in the active oil circuit 20 can be started, and the lubricating oil in the oil pan 31 is pumped to the differential 32 through the oil pump 33 and the switch valve 34, so as to lubricate the differential 32. In the second working condition, the state information of the vehicle is different, and accordingly, the lubrication requirements of the differential 32 are also different, so the speed of the oil pump 33 and the opening of the switch valve 34 can be adjusted based on the state information of the vehicle, that is, in the second working condition, the speed of the oil pump 33 and the opening of the switch valve 34 in the active oil circuit 20 can be intelligently controlled, so as to meet the lubrication requirements of the differential 32 while being conducive to achieving low power consumption, and further achieving a balance between vehicle mobility and economy.

[0067] Exemplarily, the correspondence between the vehicle status information and the lubrication strategy can be referred to Table 1.

[0068] Table 1

[0069]

[0070] Among them, the value in the first row of Table 1 is the differential rate, the value in the first column of Table 1 is the power, and the remaining values ​​are the corresponding lubrication strategies, among which the flow rates of active oil circuit flow 1, active oil circuit flow 2, active oil circuit flow 3, active oil circuit flow 4 to the maximum flow rate of the active oil circuit increase in sequence.

[0071] It should be noted that Table 1 only exemplifies a correspondence between the vehicle status information and the lubrication strategy. Table 1 is only for illustrative purposes. The vehicle status information and lubrication strategy are calibrated test values, which can be tested according to the specific vehicle.

[0072] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

[0073] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0074] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

[0075] 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. A lubrication system for a vehicle differential, which is used to lubricate the differential, characterized in that: The lubrication system comprises: A splash oil circuit, wherein an oil pan and a gear are arranged on the splash oil circuit, and the splash oil circuit is used to supply oil to the differential; An active oil circuit, wherein the oil pan, the oil pump and the switch valve are arranged on the active oil circuit; A microcontroller unit, wherein the microcontroller unit is used to confirm an operating condition based on status information of the vehicle, wherein the operating condition includes a first operating condition and a second operating condition, and in the first operating condition, the microcontroller unit is used to control the active oil circuit to stop supplying oil to the differential, and in the second operating condition, the microcontroller unit is used to control the active oil circuit to supply oil to the differential.

2. The lubrication system according to claim 1, characterized in that: The lubrication system further includes a water cooling circuit, wherein the water cooling circuit and the active oil circuit are both connected to a heat exchanger, and the heat exchanger is used for performing heat exchange between the liquid in the water cooling circuit and the liquid in the active oil circuit.

3. The lubrication system according to claim 1, characterized in that: The active oil circuit is communicated with the motor oil circuit, the active oil circuit and the motor oil circuit are connected to the same oil pan and the same oil pump, and the motor oil circuit is used to lubricate the motor.

4. The lubrication system according to claim 1, characterized in that: The active oil circuit is also provided with a filter press, and the filter press is used to filter the liquid in the active oil circuit.

5. A control method for a lubrication system of a vehicle differential, characterized in that: The control method comprises: Determining an operating condition based on the state information of the vehicle, the operating condition including a first operating condition and a second operating condition; In the first working condition, the differential is supplied with oil through a splash oil circuit, wherein an oil pan and a gear are provided on the splash oil circuit; In the second working condition, the differential is supplied with oil through the splash oil circuit, and the differential is supplied with oil through the active oil circuit, and the oil pan, the oil pump and the switch valve are arranged on the active oil circuit.

6. The control method according to claim 5, characterized in that: The working condition confirmed based on the vehicle status information includes: Acquiring vehicle status information, wherein the status information includes differential speed and power demand; When the differential rate is less than or equal to a first threshold value, and the power demand is less than or equal to a second threshold value, confirming that the operating condition is the first operating condition; When the differential rate is greater than the first threshold and the power demand is greater than the second threshold, the operating condition is confirmed to be the second operating condition.

7. The control method according to claim 6, characterized in that: The power demand includes torque, and when the differential speed is less than or equal to a first threshold and the torque is less than or equal to a third threshold, the operating condition is confirmed to be the first operating condition; When the differential speed is greater than the first threshold and the torque is greater than the third threshold, confirming that the operating condition is the second operating condition; Or, the power demand includes power, and when the differential rate is less than or equal to a first threshold, and the power is less than or equal to a fourth threshold, the operating condition is confirmed to be the first operating condition; When the differential rate is greater than the first threshold and the power is greater than the fourth threshold, the operating condition is confirmed to be the second operating condition.

8. The control method according to claim 5, characterized in that: The supplying oil to the differential through the splash oil circuit includes: The gear is started to splash the lubricating oil in the oil pan to the differential through the gear.

9. The control method according to claim 5, characterized in that: Supplying oil to the differential through the active oil circuit includes: The oil pump and the switch valve are started, and the lubricating oil in the oil pan is pumped to the differential through the oil pump and the switch valve.

10. The control method according to claim 9, characterized in that: The control method further comprises: In the second working condition, the rotation speed of the oil pump and the opening degree of the switch valve are adjusted based on the state information of the vehicle.

Images