Electric drive system, control method of electric drive system and vehicle

Abstract

The invention discloses an electric driving system, a control method of the electric driving system and a vehicle, the electric driving system comprises a speed reducer box body, a mounting space is formed in the speed reducer box body, a gear set, a differential mechanism, an oil pump and an oil pipe are arranged in the mounting space, the differential mechanism is connected with the gear set, and an outlet of the oil pump is communicated with an inlet of the oil pipe; the oil pipe is located in the installation space, at least one first oil spraying hole is formed in the oil pipe, at least one oil inlet hole is formed in a shell of the differential mechanism, the oil inlet hole is used for communicating the inner space of the differential mechanism with the installation space, and the first oil spraying hole is suitable for spraying lubricating oil towards the at least one oil inlet hole. After the electric driving system and the gear set are installed on the reducer box body, lubricating oil can enter the differential mechanism for lubrication during active lubrication, so that the lubricating oil can be saved to reduce the cost, the lubricating effect on the differential mechanism can be improved, and the efficiency of the electric driving system can also be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to an electric drive system, a control method of the electric drive system, and a vehicle. Background Art

[0002] In the related art, a locking structure is integrated on the electric drive reducer, that is, the locking structure is a differential, and a combination of splashing and oil bath is generally used to lubricate the differential, but such a lubrication method is not suitable for the electric drive reducer. The splashing method is not easy to lubricate the inside of the differential, and immersing the differential in lubricating oil for an oil bath will increase the cost of the lubricating oil. At the same time, the increase in the amount of lubricating oil will lead to a decrease in the efficiency of the electric drive system. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an electric drive system, which can lubricate the inside of the differential to improve the efficiency of the electric drive system.

[0004] According to an embodiment of the present invention, the electric drive system includes: a reducer case, an installation space is formed in the reducer case, a gear set is arranged in the installation space, a differential is connected to the gear set, an oil pump and an oil pipe, the outlet of the oil pump is connected to the inlet of the oil pipe, the oil pipe is located in the installation space, and the oil pipe is provided with at least one first oil spray hole, wherein the housing of the differential is provided with at least one oil inlet hole, the oil inlet hole is used to connect the internal space of the differential with the installation space, and the first oil spray hole is suitable for spraying lubricating oil toward at least one of the oil inlet holes.

[0005] According to the electric drive system of the embodiment of the present invention, when the gear set is installed on the reducer case, the differential is integrated on the gear set. During active lubrication, there will be at least one first oil spray hole on the oil pipe to spray oil toward the oil inlet hole of the differential, so that the lubricating oil can enter the inside of the differential for lubrication. In this way, lubricating oil can be saved to reduce costs, the lubrication effect on the differential can be improved, and the influence of the amount of lubricating oil on the efficiency of the electric drive system can be reduced, which is beneficial to improving the efficiency of the electric drive system.

[0006] According to the electric drive system of some embodiments of the present invention, there are multiple oil inlet holes and multiple first oil injection holes, and the multiple first oil injection holes are arranged around the differential in the circumferential direction of the differential, and the multiple first oil injection holes correspond one-to-one to the multiple oil inlet holes.

[0007] According to the electric drive system of some embodiments of the present invention, the inner wall of the installation space is integrated with an internal flow channel, and the internal flow channel includes a lubricating oil channel, the inlet of the lubricating oil channel is connected to the outlet of the oil pump, and the outlet of the lubricating oil channel is connected to at least one of the oil inlet holes.

[0008] According to the electric drive system of some embodiments of the present invention, a guide flow channel is provided on an inner wall of the installation space, and the guide flow channel is used to guide the lubricating oil in the installation space to the oil inlet hole.

[0009] According to the electric drive system of some embodiments of the present invention, a plurality of guide flow channels are provided, and the guide flow channels are radially distributed on the radial outside of the oil inlet hole.

[0010] According to the electric drive system of some embodiments of the present invention, the differential is provided with a connecting wire harness, which is suitable for passing through the mounting hole of the reducer case to be electrically connected to the vehicle controller of the vehicle, and at least part of the outer side of the connecting wire harness is provided with a rubber sleeve, and the rubber sleeve is sealed between the connecting wire harness and the inner wall of the mounting hole.

[0011] According to the electric drive system of some embodiments of the present invention, the reducer housing includes a first part and a second part, and the first part and the second part are connected to define the installation space.

[0012] The present invention also provides a control method for an electric drive system.

[0013] According to a control method for an electric drive system of an embodiment of the present invention, the control method is applicable to controlling an electric drive system according to any one of the above embodiments, the electric drive system comprises a motor, an input end of the gear set is connected to the motor, and an output end of the gear set is connected to a wheel of a vehicle, the control method comprises: obtaining a first rotational speed of the motor; obtaining a second rotational speed of the wheel; when an absolute value of a difference between the first rotational speed and the second rotational speed is greater than zero, controlling the vehicle to start the oil pump at a first vehicle speed; when the difference between the first rotational speed and the second rotational speed is equal to zero, controlling the vehicle to start the oil pump at a second vehicle speed.

[0014] According to the control method of the electric drive system in some embodiments of the present invention, the first vehicle speed is any vehicle speed of the vehicle, and the second vehicle speed is any vehicle speed less than 30 km / h.

[0015] The present invention also provides a vehicle.

[0016] A vehicle according to an embodiment of the present invention comprises: a vehicle controller and an electric drive system according to any one of the above embodiments, wherein the vehicle controller is suitable for controlling the electric drive system to execute a control method for the electric drive system according to any one of the above embodiments.

[0017] The control method of the vehicle and the electric drive system has the same advantages as the above-mentioned electric drive system compared with the prior art, which will not be repeated here.

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

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 Schematic diagram of an electric drive system according to some embodiments of the present invention;

[0021] Figure 2 for Figure 1 Exploded diagram of the electric drive system in the

[0022] Figure 3 for Figure 2 A schematic diagram of the second part of the reducer housing;

[0023] Figure 4 for Figure 2 A schematic diagram of another perspective of the second part of the reducer housing;

[0024] Figure 5 for Figure 1 Schematic diagram of the oil pipeline in;

[0025] Figure 6 for Figure 2 The enlarged view of A in FIG.

[0026] Figure 7 is a flow chart of a control method of an electric drive system according to some embodiments of the present invention;

[0027] Figure 8 A schematic diagram of the oil pump control logic of some embodiments of the present invention;

[0028] Fig. 9 Schematic diagram of a vehicle according to some embodiments of the present invention.

[0029] Reference numerals:

[0030] Vehicles 1000;

[0031] Electric drive system 100;

[0032] Reducer housing 10, first part 11, second part 12, gear set 13;

[0033] Differential 14, oil inlet 141, connecting harness 142, rubber sleeve 143;

[0034] Oil pump 15, oil pipe 16, first oil injection hole 161, second oil injection hole 162;

[0035] Internal flow channel 17, lubricating oil channel 171, guide flow channel 172, oil inlet 173, oil outlet 174;

[0036] Electronic control 20. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific processes and examples of materials, but those of ordinary skill in the art can be aware of the applicability of other processes and / or the use of other materials.

[0039] Reference below Figure 1-Figure 9 An electric drive system 100 according to an embodiment of the present invention is described.

[0040] like Figure 1-Figure 8 As shown, the electric drive system 100 according to the embodiment of the present invention includes: a reducer housing 10 , a differential 14 , an oil pump 15 and an oil pipe 16 .

[0041] An installation space is formed in the reducer housing 10, in which a gear set 13 is arranged, the differential 14 is connected to the gear set 13, the outlet of the oil pump 15 is connected to the inlet of the oil pipe 16, the oil pipe 16 is located in the installation space, and the oil pipe 16 is provided with at least one first oil spray hole 161, wherein the housing of the differential 14 is provided with at least one oil inlet hole 141, the oil inlet hole 141 is used to connect the internal space of the differential 14 and the installation space, and the first oil spray hole 161 is suitable for spraying lubricating oil toward at least one oil inlet hole 141.

[0042] Thus, the differential 14 can be integrated on the gear set 13. At the same time, an oil inlet hole 141 is provided on the housing of the differential 14. When the oil pipe 16 is arranged on the reducer housing 10, a first oil spray hole 161 is provided to spray lubricating oil toward the oil inlet hole 141, so that the inside of the differential 14 can be lubricated, thereby lubricating the inside of the differential 14 that is not easily lubricated.

[0043] For example, the gear set 13 is connected to the bearing in the reducer housing 10 and is arranged in the installation space. The motor of the vehicle 1000 is connected to the wheels through the gear set 13. The gear set 13 acts as a reduction gear set 13 to reduce the speed of the motor output, so that the speed of the wheels can reach a reasonable range. At the same time, the differential 14 is installed on the gear set 13, so that the differential 14 can control the different speeds of the wheels on both sides of the vehicle 1000, which can increase the passability of the vehicle 1000. An oil pipe 16 and an oil pump 15 are also installed in the reducer housing 10. The outlet of the oil pump 15 is connected to the inlet of the oil pipe 16 to provide a pressure relief for the oil pipe 16. Oil supply, and when the oil pipe 16 is arranged in the reducer housing 10, it will spray oil toward the gear set 13 to lubricate the gear set 13. At the same time, the oil pipe 16 will also lubricate the differential 14. For example, the lubricating oil is sprayed toward the oil inlet hole 141 on the housing of the differential 14 through the first oil spray hole 161 on the oil pipe 16, so that the lubricating oil can lubricate the inside of the differential 14. At the same time, a plurality of second oil spray holes 162 are also provided on the oil pipe 16. The second oil spray holes 162 will face the gear set 13. In this way, when the differential 14 is actively lubricated, the gear set 13 can also be lubricated, which can improve the transmission efficiency of the gear set 13.

[0044] Furthermore, after the differential 14 is integrated on the gear set 13, the electric drive system 100 in this embodiment also has strong versatility, so that any vehicle 1000 that needs to use a differential lock can use the electric drive system 100 in this embodiment.

[0045] According to the electric drive system 100 of the embodiment of the present invention, when the gear set 13 is installed on the reducer case 10, the differential 14 is integrated on the gear set 13. During active lubrication, there will be at least one first oil spray hole 161 on the oil pipe 16 to spray oil toward the oil inlet hole 141 of the differential 14, so that the lubricating oil can enter the inside of the differential 14 for lubrication. In this way, lubricating oil can be saved to reduce costs, the lubrication effect on the differential 14 can be improved, and the influence of the amount of lubricating oil on the efficiency of the electric drive system 100 can be reduced, which is beneficial to improving the efficiency of the electric drive system 100.

[0046] In some embodiments, Figure 2 and Figure 5As shown, there are multiple oil inlet holes 141 and multiple first oil injection holes 161 . The multiple first oil injection holes 161 are arranged around the differential 14 in the circumferential direction of the differential 14 , and the multiple first oil injection holes 161 correspond one-to-one to the multiple oil inlet holes 141 .

[0047] It should be noted that the oil inlet hole 141 on the housing of the differential 14 can be one, or two, or more, and the first oil injection hole 161 will correspond to the oil inlet hole 141 one by one, that is, the first oil injection hole 161 on the oil pipe 16 can also be one, or two, or more. Preferably, in the present embodiment, three first oil injection holes 161 are provided, and three oil inlet holes 141 are also provided.

[0048] Thus, the multiple first oil injection holes 161 on the oil pipe 16 inject oil to the differential 14, which can improve the lubrication effect of the differential 14, and the multiple oil inlet holes 141 on the housing of the differential 14 can allow more lubricating oil to enter the interior of the differential 14, thereby further improving the lubrication effect of the differential 14.

[0049] In some embodiments, Figure 2-Figure 3 As shown, the inner wall of the installation space is integrated with an internal flow channel 17 , which includes a lubricating oil channel 171 , the inlet of the lubricating oil channel 171 is connected to the outlet of the oil pump 15 , and the outlet of the lubricating oil channel 171 is connected to at least one oil inlet hole 141 .

[0050] It should be noted that the internal flow channel 17 also includes an oil inlet flow channel, which is provided with an oil inlet port 173 and an oil outlet port 174. The oil inlet port 173 is connected to the oil pump 15, and the oil outlet port 174 is connected to the inlet of the oil pipe 16. The oil inlet flow channel can transport the lubricating oil to the oil pump 15, and the oil pump 15 then pumps the lubricating oil into the oil pipe 16. In this way, the internal flow channel 17 integrates the oil inlet flow channel and the lubricating oil channel 171, which can reduce the volume of the reducer housing 10 and is conducive to the miniaturized design of the electric drive system 100.

[0051] Furthermore, the lubricating oil in the lubricating oil passage 171 is also pumped in by the oil pump 15, and the outlet of the lubricating oil passage 171 is connected to at least one oil inlet hole 141, that is, the outlet of the lubricating oil passage 171 is arranged at the bearing where the differential 14 is installed on the reducer case 10, so that the lubricating oil can enter the interior of the differential 14 along the bearing, and at the same time, some of the lubricating oil enters the interior of the differential 14 through the oil inlet hole 141.

[0052] Therefore, the internal flow channel 17 on the inner wall of the installation space can guide part of the lubricating oil into the differential 14 to further enhance the lubrication effect of the differential 14. At the same time, the internal flow channel 17 can integrate the oil inlet channel and the lubricating oil channel 171 together to make the reducer case 10 smaller, thereby facilitating the miniaturization design of the electric drive system 100.

[0053] In some embodiments, Figure 2-Figure 3 As shown, a guide channel 172 is provided on the inner wall of the installation space, and the guide channel 172 is used to guide the lubricating oil in the installation space to the oil inlet hole 141.

[0054] It should be noted that the guide flow channel 172 can collect the lubricating oil splashed by the rotation of the gear set 13 and make the lubricating oil drip into the oil inlet hole 141 under the action of gravity, which can make the lubrication effect of the differential 14 better.

[0055] Furthermore, the guide channel 172 is integrated on the shell of the reducer case 10, and the radial cross-section of the guide channel 172 can be constructed as an arc-shaped groove, so that the splashing lubricating oil can be accommodated in the groove, and one end of the guide channel 172 will face the oil inlet 141, so that the lubricating oil can flow into the differential 14 under the action of gravity, or an oil inlet is provided at one end of the guide channel 172, and the oil outlet faces the oil inlet 141. At this time, the oil inlet will be made as large as possible without affecting the other components in the reducer case 10, so that more splashing lubricating oil can be collected, and the collected lubricating oil can drip into the oil inlet 141 from the oil outlet.

[0056] Therefore, the guide channel 172 can guide the lubricating oil splashed in the reducer housing 10 into the reducer, so that the reducer can obtain a better lubrication effect.

[0057] In some embodiments, Figure 2-Figure 3 As shown, a plurality of guide flow channels 172 are provided, and the guide flow channels 172 are radially distributed on the radial outer side of the oil inlet hole 141 .

[0058] Therefore, a plurality of guide flow channels 172 are provided in the installation space, so that more lubricating oil can flow to the oil inlet hole 141, and the radial distribution of the guide flow channels 172 enables the guide flow channels 172 to collect the lubricating oil splashed in multiple directions, so that the guide flow channels 172 can contact more lubricating oil, thereby better lubricating the reducer.

[0059] In some embodiments, Figure 2 and Figure 6 As shown, the differential 14 is provided with a connecting harness 142, which is suitable for passing through the mounting hole of the reducer case 10 to be electrically connected to the vehicle controller of the vehicle 1000, and at least part of the outer side of the connecting harness 142 is provided with a rubber sleeve 143, which is sealed between the connecting harness 142 and the inner wall of the mounting hole.

[0060] It should be noted that in the reducer case 10, the oil pump 15 is also provided with a wiring harness, and the wiring harness of the oil pump 15 and the connecting wiring harness 142 are electrically connected to the vehicle controller of the vehicle 1000 through the mounting hole. When the rubber sleeve 143 seals between the connecting wiring harness 142 and the mounting hole, the wiring harness of the oil pump 15 is also arranged in the rubber sleeve 143, and a sealing ring is also provided on the rubber sleeve 143, so as to improve the sealing effect.

[0061] Therefore, the rubber sleeve 143 is provided between the connecting wire harness 142 and the inner wall of the mounting hole to achieve sealing of the reducer housing 10, so that the reducer housing 10 is not prone to oil leakage.

[0062] In some embodiments, Figure 1-Figure 2 As shown, the reducer housing 10 includes a first portion 11 and a second portion 12 , and the first portion 11 and the second portion 12 are connected to define an installation space.

[0063] Therefore, the reducer housing 10 is divided into the first part 11 and the second part 12, so as to protect the gear set 13 and other components, and also facilitate the disassembly and assembly of the gear set 13 and other components.

[0064] The present invention also provides a control method for the electric drive system 100 .

[0065] According to the control method of the electric drive system 100 of an embodiment of the present invention, the control method is applicable to controlling the electric drive system 100 of any one of the above embodiments, the electric drive system 100 includes a motor, the input end of the gear set 13 is connected to the motor, and the output end of the gear set 13 is connected to the wheels of the vehicle 1000.

[0066] like Figure 7 As shown, the control method includes:

[0067] S10: Obtaining a first speed of the motor;

[0068] S20: Acquire a second rotation speed of the wheel;

[0069] S21: when the absolute value of the difference between the first speed and the second speed is greater than zero, controlling the vehicle 1000 to start the oil pump 15 at the first vehicle speed;

[0070] Therefore, when the absolute value of the difference between the first speed and the second speed is greater than zero, the vehicle 1000 is in a differential state, and the gear set 13 and the differential 14 in the differential state need to be well lubricated, that is, the vehicle 1000 will be controlled to start the oil pump 15 at this time, so that the differential 14 and the gear set 13 can be well lubricated.

[0071] S22: When the difference between the first rotation speed and the second rotation speed is zero, the vehicle 1000 is controlled to start the oil pump 15 at the second vehicle speed.

[0072] Therefore, when the difference between the first speed and the second speed is equal to zero, the vehicle 1000 is not in a differential state. In this state, the vehicle 1000 will control the opening of the oil pump 15 according to the vehicle speed. When the vehicle 1000 is in the second speed, the oil pump 15 will be turned on to lubricate the differential 14 and the gear set 13.

[0073] In some embodiments, the first vehicle speed is any vehicle speed of the vehicle 1000 , and the second vehicle speed is any vehicle speed less than 30 km / h.

[0074] Exemplarily, “the first speed is any speed of vehicle 1000” means that when the speed of vehicle 1000 is V1 at this time, V1 can be V1=10km / h or V1=30km / h, etc., or V1=90km / h, and “the second speed is any speed less than 30km / h” means that when the speed of vehicle 1000 at this time is V2, V2 satisfies V2<30km / h, that is, V2 can be V2=10km / h or V2=20km / h, etc.

[0075] It should be noted that, in the present embodiment, the second vehicle speed is any vehicle speed less than 30 km / h and is only for illustration. In other embodiments, the second vehicle speed may be other vehicle speeds. When the vehicle 1000 is at the second vehicle speed, due to the low vehicle speed, the lubrication effect of the gear set 13 when stirring the oil for lubrication is not good. In this way, the oil pump 15 is started to lubricate the differential 14 and the gear set 13 so that the gear set 13 and the differential 14 are in good working condition.

[0076] The present invention also provides a vehicle 1000 .

[0077] like Fig. 9 As shown, a vehicle 1000 according to an embodiment of the present invention comprises: a vehicle controller and an electric drive system 100 of any one of the above embodiments, and the vehicle controller is suitable for controlling the electric drive system 100 to execute a control method of the electric drive system 100 of any one of the above embodiments.

[0078] Preferably, if Figure 8As shown, an electronic control 20 is also installed on the reducer case 10, and the electronic control 20 is electrically connected to the differential 14 and the oil pump 15. The electronic control 20 can control the activation of the oil pump 15 and can also control the activation of the differential 14. At the same time, speed sensors are installed at the motor and the wheels. The speed sensors detect the first speed and the second speed and send the first speed and the second speed to the vehicle controller. In this way, the simple control logic of the oil pump 15 when the vehicle 1000 is running is: the vehicle controller obtains the first speed of the motor and the second speed of the wheel through the sensor, and determines whether the first speed and the second speed are differential. If differential, the vehicle 1000 will start the oil pump 15 in the full speed range. If not differential, the oil pump 15 is started in the speed range where the vehicle 1000 is less than 30km / h.

[0079] According to the vehicle 1000 of the embodiment of the present invention, in the electric drive system 100 thereon, when the gear set 13 is installed on the reducer case 10, the differential 14 is integrated on the gear set 13, and during active lubrication, there will be at least one first oil spray hole 161 on the oil pipe 16 to spray oil toward the oil inlet hole 141 of the differential 14, so that the lubricating oil can enter the inside of the differential 14 for lubrication. In this way, lubricating oil can be saved to reduce costs, the lubrication effect on the differential 14 can be improved, and the influence of the amount of lubricating oil on the efficiency of the electric drive system 100 can be reduced, which is beneficial to improving the efficiency of the electric drive system 100.

[0080] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0081] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0082] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0085] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electric drive system, characterized in that: include: A reducer housing, wherein an installation space is formed in the reducer housing, and a gear set is arranged in the installation space; a differential connected to the gear set; An oil pump and an oil pipe, wherein the outlet of the oil pump is communicated with the inlet of the oil pipe, the oil pipe is located in the installation space, and the oil pipe is provided with at least one first oil injection hole; The housing of the differential is provided with at least one oil inlet hole, and the oil inlet hole is used to connect the internal space of the differential with the installation space, and the first oil spray hole is suitable for spraying lubricating oil toward at least one of the oil inlet holes.

2. The electric drive system according to claim 1, characterized in that: There are a plurality of the oil inlet holes and the first oil injection holes, and the plurality of the first oil injection holes are arranged around the differential in the circumferential direction of the differential, and the plurality of the first oil injection holes correspond one-to-one to the plurality of the oil inlet holes.

3. The electric drive system according to claim 2, characterized in that: An inner wall of the installation space is integrated with an internal flow channel, and the internal flow channel includes a lubricating oil channel, an inlet of the lubricating oil channel is connected to an outlet of the oil pump, and an outlet of the lubricating oil channel is connected to at least one of the oil inlet holes.

4. The electric drive system according to claim 1, characterized in that: A guide flow channel is provided on the inner wall of the installation space, and the guide flow channel is used to guide the lubricating oil in the installation space to the oil inlet hole.

5. The electric drive system according to claim 4, characterized in that: A plurality of guide flow channels are provided, and the guide flow channels are radially distributed on the radial outside of the oil inlet hole.

6. The electric drive system according to claim 1, characterized in that: The differential is provided with a connecting harness, which is suitable for passing through the mounting hole of the reducer case to be electrically connected to the vehicle controller of the vehicle, and at least part of the outer side of the connecting harness is provided with a rubber sleeve, and the rubber sleeve is sealed between the connecting harness and the inner wall of the mounting hole.

7. The electric drive system according to any one of claims 1 to 6, characterized in that: The reducer housing includes a first portion and a second portion, and the first portion and the second portion are connected to define the installation space.

8. A control method for an electric drive system, the control method being applicable to controlling the electric drive system according to any one of claims 1 to 7, the electric drive system comprising a motor, the input end of the gear set being connected to the motor, the output end of the gear set being connected to the wheels of a vehicle, and characterized in that: The control method comprises: Acquire a first rotation speed of the motor; Acquiring a second rotation speed of the wheel; When the absolute value of the difference between the first speed and the second speed is greater than zero, controlling the vehicle to start the oil pump at a first vehicle speed; When the difference between the first speed and the second speed is equal to zero, the vehicle is controlled to start the oil pump at a second vehicle speed.

9. The control method of the electric drive system according to claim 8, characterized in that: The first vehicle speed is any vehicle speed of the vehicle, and the second vehicle speed is any vehicle speed less than 30 km / h.

10. A vehicle, characterized in that: include: A vehicle controller and an electric drive system as described in any one of claims 1-7, wherein the vehicle controller is suitable for controlling the electric drive system to execute the control method of the electric drive system as described in any one of claims 8-9.

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