Duplex electric drive bridge cooling method and system

Abstract

The invention discloses a duplex electric drive axle cooling method and system, and belongs to the technical field of electric automobiles. The method comprises the steps that the driving state of the duplex electric drive axle is obtained; in response to the fact that at least one bridge does not work in the driving state, a flow adjusting device is controlled to enable cooling branches in the duplex electric drive bridge not to communicate with one another; in response to normal working of the two axles in the driving state, temperature information of the duplex electric drive axles and the working state of a cooling liquid driving device are obtained; and according to the temperature information and the working state, the temperature and flow of cooling liquid in a cooling loop and the flow of cooling liquid in a duplex electric drive bridge cooling branch are controlled. By controlling the temperature and the flow of the cooling liquid in the cooling loop and the flow of the cooling liquid in the duplex electric drive bridge cooling branch, the flow of the cooling liquid is distributed according to needs, the power consumption of the system under different working conditions is reduced, and the cooling efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicles, and in particular relates to a cooling method and system for a dual electric drive axle. Background Art

[0002] With the rapid development of electric vehicle technology, people's requirements for the performance of automobile drive systems are constantly increasing. As a key component of electric vehicles, the electric drive axle has multiple electrical components, which will generate a lot of heat when working. If the heat cannot be effectively dissipated in time, it will seriously affect the working performance and service life of the electric drive axle. Therefore, it is necessary to set a reasonable cooling system control strategy for the electric drive axle to effectively dissipate heat and keep the heat dissipation components at a suitable temperature, which can not only ensure working performance and reduce power loss, but also improve the overall reliability of the vehicle.

[0003] However, most existing cooling systems are designed to cool a single drive axle, and do not manage heat collaboratively from the perspective of vehicle integration. Therefore, it is difficult to achieve on-demand distribution of coolant flow, and the system energy consumption is high and the cooling efficiency is low. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a dual electric drive axle cooling method and system, which realizes on-demand distribution of the coolant flow by controlling the temperature and flow rate of the coolant in the cooling circuit and the flow rate of the coolant in the cooling branch of the dual electric drive axle, thereby reducing the power consumption of the system under different working conditions and improving the cooling efficiency.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a dual electric drive axle cooling method, the method comprising: Get the driving status of the dual electric drive axle; In response to at least one bridge not working in the driving state, controlling the flow regulating device so that the cooling branches in the dual electric drive bridge are not connected to each other; In response to both bridges working normally in the driving state, acquiring temperature information of the dual electric drive bridge and the working state of the coolant drive device; According to the temperature information and the working state, the temperature and flow rate of the coolant in the cooling circuit and the flow rate of the coolant in the cooling branch of the dual electric drive axle are controlled.

[0006] In combination with the first aspect, further, the method for controlling the temperature and flow rate of the coolant in the cooling circuit and the flow rate of the coolant in the cooling branch of the dual electric drive axle according to the temperature information and the working state includes: In response to the temperature information being normal and the working state being normal, controlling the flow of coolant in the cooling circuit and the cooling branch of the dual electric drive axle; In response to the temperature information being normal, the working state being abnormal, and the temperature information exceeding a preconfigured temperature threshold, generating an alarm message; In response to the temperature information being normal, the working state being abnormal, and the temperature information not exceeding the preconfigured temperature threshold, controlling the temperature of the coolant in the cooling circuit so that the cooling circuit dissipates heat at a maximum heat dissipation capacity, and generating fault information; In response to the temperature information being abnormal and the working state being normal, controlling the temperature and flow rate of the coolant in the cooling circuit so that the cooling circuit dissipates heat at a maximum heat dissipation capacity, and generating fault information; In response to the temperature information being abnormal and the working state being abnormal, an alarm message is generated.

[0007] In combination with the first aspect, further, the method for controlling the temperature of the coolant in the cooling circuit includes: The speed of the cooling device in the cooling circuit is controlled to adjust the temperature of the coolant in the cooling circuit.

[0008] In combination with the first aspect, further, the method for controlling the flow rate of coolant in a cooling circuit includes: According to the temperature detection values ​​of the middle axle electric drive axle and the rear axle electric drive axle in the temperature information, the speed of the coolant driving device is controlled to adjust the flow rate of the coolant in the cooling circuit; The relationship between the flow rate of the coolant in the cooling circuit and the temperature information is: , In the formula, Indicates the flow rate of coolant in the cooling circuit, Indicates the maximum output flow of the coolant drive unit, Respectively represent the temperature detection values ​​of the middle axle electric drive axle and the rear axle electric drive axle, Indicates the temperature reference value, which is equal to twice the preconfigured temperature threshold.

[0009] In combination with the first aspect, further, the method for controlling the flow rate of coolant in the cooling branch of the dual electric drive axle includes: In response to the temperature detection value of the middle electric drive axle in the temperature information not being equal to the temperature detection value of the rear electric drive axle, controlling the opening of the flow regulating device to adjust the flow of coolant in the cooling branch of the dual electric drive axle until the temperature detection values ​​are equal; Among them, the relationship between the flow rate of the coolant in the cooling branch of the dual electric drive axle and the temperature information is: , In the formula, Respectively represent the flow rate of coolant in the cooling branch of the middle axle electric drive axle and the rear axle electric drive axle, They respectively represent the temperature detection values ​​of the middle axle electric drive axle and the rear axle electric drive axle.

[0010] In a second aspect, the present invention further provides a dual electric drive axle cooling system, which is used to implement the dual electric drive axle cooling method described in any one of the first aspects, the system comprising: a cooling device, a coolant driving device, a control device, a flow regulating device and a dual electric drive axle, the dual electric drive axle comprising a middle axle electric drive axle and a rear axle electric drive axle configured in parallel; The water outlet pipeline of the cooling device is connected to the water inlet pipeline of the coolant driving device, the water outlet pipeline of the coolant driving device is connected to the water inlet pipeline of the control device, the water outlet pipeline of the control device is connected to the water inlet pipeline of the flow regulating device, the first water outlet pipeline of the flow regulating device is connected to the water inlet pipeline of the middle axle electric drive axle, the second water outlet pipeline of the flow regulating device is connected to the water inlet pipeline of the rear axle electric drive axle, and the water outlet pipeline of the middle axle electric drive axle and the water outlet pipeline of the rear axle electric drive axle are commonly connected to the water inlet pipeline of the cooling device; The control device is used to obtain the driving state, temperature information of the middle axle electric drive axle and the rear axle electric drive axle in the dual electric drive axle and the working state of the coolant drive device, and control the rotation speed of the cooling device and the coolant drive device and the opening of the flow regulating device according to the driving state, temperature information and working state, so as to adjust the temperature and flow of the coolant in the cooling circuit and the flow of the coolant in the cooling branch of the dual electric drive axle.

[0011] In combination with the second aspect, further, the mid-bridge electric drive axle and the rear-bridge electric drive axle are respectively equipped with drive motors for generating power, so that the mid-bridge electric drive axle and the rear-bridge electric drive axle can drive the vehicle together or individually.

[0012] In combination with the second aspect, the invention further includes: a temperature monitoring device for detecting the temperature of the coolant in the cooling branch of the dual electric drive axle, the temperature monitoring device including a first temperature sensor and a second temperature sensor; the first temperature sensor is arranged on the water inlet pipe of the middle electric drive axle, and the temperature detection value is The second temperature sensor is arranged on the water inlet pipe of the rear axle electric drive axle, and the temperature detection value is .

[0013] In combination with the second aspect, it further includes: a coolant driving device for storing coolant and replenishing water to the cooling circuit, the water outlet pipe of the coolant driving device is connected to the first water inlet pipe of the water replenishing tee, the second water inlet pipe of the water replenishing tee is connected to the water outlet pipe of the cooling device, and the water outlet pipe of the water replenishing tee is connected to the water inlet pipe of the coolant driving device.

[0014] In combination with the second aspect, further, the cooling device includes a radiator and a fan arranged on one side of the radiator, and the fan is used to dissipate heat from the radiator.

[0015] Compared with the prior art, the present invention can at least achieve the following beneficial effects: 1. The dual electric drive axle cooling method provided by the present invention is based on the acquired driving state, temperature information and working state of the dual electric drive axle, and controls the opening of the flow regulating device to adjust the flow of coolant in the cooling branch of the dual electric drive axle, thereby realizing on-demand distribution of branch flow and reducing the complexity of the cooling system; and controls the rotation speed of the cooling device and the coolant driving device to adjust the temperature and flow of the coolant in the cooling circuit, thereby reducing the power consumption of the system under different working conditions and improving the cruising range of the whole vehicle.

[0016] 2. The twin electric drive axle cooling system provided by the present invention has a flow regulating device at the front end of the twin electric drive axles configured in parallel. The control device in the cooling circuit adjusts the flow of coolant in the cooling branch of the twin electric drive axles by controlling the opening of the flow regulating device, thereby realizing on-demand distribution of the branch flow, reducing system energy consumption and improving cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a flow chart of a dual electric drive axle cooling method provided by an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a dual electric drive axle cooling system provided by an embodiment of the present invention.

[0019] In the figure: 1-cooling device; 11-radiator; 12-fan; 2-coolant driving device; 3-water supply tee; 4-coolant storage device; 5-temperature monitoring device; 51-first temperature sensor; 52-second temperature sensor; 6-dual electric drive axle; 61-middle electric drive axle; 62-rear electric drive axle; 7-control device; 8-flow regulating device. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0021] Embodiment 1

[0022] This embodiment provides a dual electric drive bridge cooling method, such as Figure 1 FIG. 1 is a flow chart of the method provided in this embodiment, which mainly includes the following steps: S1: Acquire the driving state of the dual electric drive bridge 6; S2: In response to at least one bridge not working in the driving state, the flow regulating device 8 is controlled to make the cooling branches in the dual electric drive bridge 6 disconnected from each other; S3: in response to both bridges working normally in the driving state, obtaining temperature information of the dual electric drive bridge 6 and the working state of the coolant drive device 2; S4: According to the temperature information and the working state, the temperature and flow rate of the coolant in the cooling circuit and the flow rate of the coolant in the cooling branch of the dual electric drive axle 6 are controlled.

[0023] It should be noted that before executing step S1, the temperature threshold of the dual electric drive axle 6 needs to be manually configured. In this embodiment, since the temperature monitoring device 5 for detecting the temperature information of the dual electric drive axle 6 is installed in the coolant of the dual electric drive axle 6, the pre-configured temperature threshold is 80°C. In addition, the dual electric drive axle 6 includes a middle axle electric drive axle 61 and a rear axle electric drive axle 62 configured in parallel, and the temperature monitoring device 5 includes a first temperature sensor 51 for detecting the temperature of the coolant in the middle axle electric drive axle 61 and a second temperature sensor 52 for detecting the temperature of the coolant in the rear axle electric drive axle 62, and the temperature detection values ​​thereof are respectively and .

[0024] Furthermore, the driving state of the dual electric drive axle 6 obtained in step S1 refers to whether the middle electric drive axle 61 and the rear electric drive axle 62 are in a normal working state. If at least one of the bridges is not working, that is, the middle electric drive axle 61 is not working or the rear electric drive axle 62 is not working or both the middle electric drive axle 61 and the rear electric drive axle 62 are not working, then execute step S2: control the flow regulating device 8 so that the cooling branches of the middle electric drive axle 61 and the rear electric drive axle 62 in the dual electric drive axle 6 are not connected to each other, reducing the demand for coolant flow circulation of the whole vehicle, thereby reducing system energy consumption. If both the middle electric drive axle 61 and the rear electric drive axle 62 are working normally, then execute step S3: obtain the temperature information of the dual electric drive axle 6 detected by the temperature monitoring device 5 and the working state of the coolant drive device 2.

[0025] Combine the following Figure 1 , the method of how to control the temperature and flow rate of the coolant in the cooling circuit and the flow rate of the coolant in the cooling branch of the dual electric drive axle 6 according to the temperature information and the working state in step S4 is further described in detail: S401: In response to the temperature information being normal and the working state being normal, controlling the flow of coolant in the cooling circuit and the cooling branch of the dual electric drive axle 6; S402: In response to the temperature information being normal, the working state being abnormal, and the temperature information exceeding a preconfigured temperature threshold, generating an alarm message; S403: In response to the temperature information being normal, the working state being abnormal, and the temperature information not exceeding a preconfigured temperature threshold, controlling the temperature of the coolant in the cooling circuit so that the cooling circuit dissipates heat at a maximum heat dissipation capacity, and generating fault information; S404: In response to the temperature information being abnormal and the working state being normal, controlling the temperature and flow rate of the coolant in the cooling circuit so that the cooling circuit dissipates heat at a maximum heat dissipation capacity, and generating fault information; S405: In response to the temperature information being abnormal and the working state being abnormal, generating alarm information.

[0026] It should be noted that if the temperature information of the dual electric drive axle 6 obtained is abnormal, the actual temperature of the coolant in the cooling branches of the middle electric drive axle 61 and the rear electric drive axle 62 cannot be detected, and the fan 12 and the coolant drive device 2 in the cooling device 1 need to be controlled to operate at the maximum speed. By adjusting the temperature and flow of the coolant in the cooling circuit, the cooling circuit can dissipate heat with the maximum heat dissipation capacity to ensure that the cooling system can meet the heat dissipation requirements of the entire vehicle and avoid vehicle failure.

[0027] In addition, if the working state of the obtained coolant drive device 2 is abnormal, effective heat dissipation cannot be performed; it is necessary to control the fan 12 in the cooling device 1 to operate at the maximum speed for a short period of time, and adjust the temperature of the coolant in the cooling circuit to make the cooling circuit dissipate heat with the maximum heat dissipation capacity to ensure that the cooling system can meet the heat dissipation needs of the entire vehicle in a short period of time to avoid vehicle failure; when the situation is more serious or the actual situation cannot be judged, the cooling system needs to be stopped immediately for investigation and repair.

[0028] Specifically, when the temperature information is normal and the working state is abnormal, if the temperature information exceeds the pre-configured temperature threshold, the temperature is too high and cannot be effectively dissipated, which will affect the working performance of the dual electric drive axle 6, so step S402 is executed: an alarm message is generated to indicate that the cooling system needs to be stopped immediately for investigation and repair. If the temperature information does not exceed the pre-configured temperature threshold and cannot be effectively dissipated, rapid heat dissipation is required in a short time, so step S403 is executed: the fan 12 in the cooling device 1 is controlled to work at the maximum speed, and the temperature of the coolant in the cooling circuit is adjusted to allow the cooling circuit to dissipate heat at the maximum heat dissipation capacity, so as to ensure that the cooling system can meet the heat dissipation requirements of the vehicle in a short time and avoid vehicle failure; and a fault message is generated to indicate that the cooling system needs to be stopped for investigation and repair.

[0029] When the temperature information is abnormal and the working state is normal, the actual temperature of the coolant in the dual electric drive axle 6 cannot be detected, so step S404 is executed: the fan 12 and the coolant drive device 2 in the cooling device 1 are controlled to operate at the maximum speed, and the temperature and flow of the coolant in the cooling circuit are adjusted to allow the cooling circuit to dissipate heat at the maximum heat dissipation capacity to ensure that the cooling system can meet the heat dissipation requirements of the entire vehicle in a short time and avoid vehicle failure; and fault information is generated to indicate that the cooling system needs to be stopped for investigation and repair.

[0030] When the temperature information is abnormal and the working state is abnormal, the actual temperature of the coolant in the dual electric drive axle 6 cannot be detected and effective heat dissipation cannot be performed, and the actual situation in the cooling system cannot be determined. Therefore, step S405 is executed: an alarm message is generated to indicate that the cooling system needs to be stopped immediately for investigation and repair.

[0031] Furthermore, when the temperature information is normal and the working state is normal, execute step S401: control the rotation speed of the coolant drive device 2 and the opening of the flow regulating device 8, and realize on-demand distribution of branch flow by adjusting the flow of coolant in the cooling circuit and the cooling branch of the dual electric drive axle 6 to improve the cooling efficiency.

[0032] The dual electric drive axle cooling method provided in this embodiment is based on the acquired driving state, temperature information and working state of the dual electric drive axle. By controlling the opening of the flow regulating device, the flow of coolant in the cooling branch of the dual electric drive axle is adjusted, thereby realizing on-demand distribution of branch flow and reducing the complexity of the cooling system; by controlling the rotational speed of the cooling device and the coolant driving device, the temperature and flow of the coolant in the cooling circuit are adjusted, thereby reducing the power consumption of the system under different working conditions and improving the cruising range of the whole vehicle.

[0033] Embodiment 2

[0034] This embodiment provides a dual electric drive axle cooling method, which differs from the first embodiment in that the method for controlling the coolant flow in the cooling circuit includes: controlling the rotation speed of the coolant drive device 2 according to the temperature detection values ​​of the middle axle electric drive axle 61 and the rear axle electric drive axle 62 respectively detected by the first temperature sensor 51 and the second temperature sensor 52 in the temperature information to adjust the coolant flow in the cooling circuit.

[0035] Among them, the relationship between the flow rate and temperature information of the coolant in the cooling circuit is: , In the formula, Indicates the flow rate of coolant in the cooling circuit, represents the maximum output flow of the coolant drive device 2, Respectively represent the temperature detection values ​​of the middle bridge electric drive bridge 61 and the rear bridge electric drive bridge 62, Indicates the temperature reference value, which is equal to twice the preconfigured temperature threshold.

[0036] It should be noted that if the temperature detection value of the middle bridge electric drive bridge 61 detected by the first temperature sensor 51 is is 50°C, and the temperature detection value of the rear axle electric drive bridge 62 detected by the second temperature sensor 52 is The reference temperature is 80°C. is 160°C, then the flow rate of the coolant output by the coolant driving device 2 to the cooling circuit is .

[0037] In this embodiment, the method for controlling the coolant flow in the cooling branch of the dual electric drive axle 6 includes: in response to the temperature detection value of the middle axle electric drive axle 61 detected by the first temperature sensor 51 in the temperature information being not equal to the temperature detection value of the rear axle electric drive axle 62 detected by the second temperature sensor 52, controlling the opening of the flow regulating device 8 to adjust the coolant flow in the middle axle electric drive axle 61 and the rear axle electric drive axle 62 in the dual electric drive axle 6 until the temperature detection values ​​are equal.

[0038] Among them, the relationship between the flow rate and temperature information of the coolant in the cooling branch of the dual electric drive axle 6 is: , In the formula, Respectively represent the flow rate of coolant in the cooling branch of the middle axle electric drive axle 61 and the rear axle electric drive axle 62, The temperature detection values ​​of the middle axle electric drive axle 61 and the rear axle electric drive axle 62 are respectively indicated.

[0039] It should be noted that if the temperature detection value of the middle bridge electric drive bridge 61 detected by the first temperature sensor 51 is is 50°C, and the temperature detection value of the rear axle electric drive bridge 62 detected by the second temperature sensor 52 is is 80℃, then the flow rate of the coolant in the cooling branch of the middle bridge electric drive bridge 61 is and the flow rate of coolant in the cooling branch of the rear axle electric drive axle 62 The ratio is 5:8.

[0040] The flowchart of the method provided in this embodiment only shows the logical sequence of the method described in this embodiment. In other possible embodiments of the present invention, different methods may be used without conflict. Figure 1The steps shown or described are completed in the order shown. The dual electric drive axle cooling method provided in this embodiment can be applied to a terminal and can be performed by a dual electric drive axle cooling device, which can be implemented by software and / or hardware, and the device can be integrated in a terminal, for example: any smart phone, tablet computer or computer device with communication function.

[0041] Embodiment 3

[0042] This embodiment provides a dual electric drive axle cooling system. Figure 2 , including a cooling circuit consisting of a cooling device 1, a coolant driving device 2, a control device 7, a flow regulating device 8 and a dual electric drive axle 6, wherein the dual electric drive axle 6 includes a middle axle electric drive axle 61 and a rear axle electric drive axle 62 configured in parallel.

[0043] Specifically, the water outlet pipeline of the cooling device 1 is connected to the water inlet pipeline of the coolant driving device 2, which is used to dissipate the heat of the coolant in the cooling circuit; the water outlet pipeline of the coolant driving device 2 is connected to the water inlet pipeline of the control device 7, which is used to drive the coolant in the cooling circuit; the water outlet pipeline of the control device 7 is connected to the water inlet pipeline of the flow regulating device 8; the first water outlet pipeline of the flow regulating device 8 is connected to the water inlet pipeline of the middle axle electric drive axle 61, and the second water outlet pipeline is connected to the water inlet pipeline of the rear axle electric drive axle 62, which is used to adjust the flow of coolant in the cooling branches of the middle axle electric drive axle 61 and the rear axle electric drive axle 62; the water outlet pipelines of the middle axle electric drive axle 61 and the rear axle electric drive axle 62 are commonly connected to the water inlet pipeline of the cooling device 1, thereby forming a cooling circuit of the cooling system.

[0044] It should be noted that the control device 7 can be electrically connected to the cooling device 1, the coolant drive device 2, the flow regulating device 8 and the dual electric drive axle 6 respectively to obtain the driving state, temperature information of the middle axle electric drive axle 61 and the rear axle electric drive axle 62 in the dual electric drive axle 6 and the working state of the coolant drive device 2, and control the rotation speed of the cooling device 1 and the coolant drive device 2 and the opening of the flow regulating device 8 according to the driving state, temperature information and working state, so as to adjust the temperature and flow of the coolant in the cooling circuit and the flow of the coolant in the cooling branch of the dual electric drive axle 6.

[0045] Furthermore, the middle electric drive axle 61 and the rear electric drive axle 62 are respectively equipped with drive motors, which can generate power to enable the middle electric drive axle 61 and the rear electric drive axle 62 to drive the vehicle together or individually.

[0046] As an embodiment, in order to conveniently detect the temperature of the coolant in the cooling branch of the dual electric drive axle 6, a temperature monitoring device 5 can be installed in the coolant of the dual electric drive axle 6. The temperature monitoring device 5 includes a first temperature sensor 51 for detecting the temperature of the coolant in the cooling branch of the middle electric drive axle 61 and a second temperature sensor 52 for detecting the temperature of the coolant in the cooling branch of the rear electric drive axle 62. The first temperature sensor 51 is arranged on the water inlet pipe of the middle electric drive axle 61, and its temperature detection value is The second temperature sensor 52 is arranged on the water inlet pipe of the rear axle electric drive axle 62, and its temperature detection value is .

[0047] As an optional embodiment, the dual electric drive axle cooling system can also be provided with a coolant storage device 4 outside the cooling circuit for storing coolant and replenishing water to the cooling circuit. The coolant storage device 4 is connected to the cooling circuit via a water replenishment tee 3, and the water replenishment tee 3 is respectively connected to the coolant storage device 4, the cooling device 1 and the coolant drive device 2, which helps to achieve water circulation. Specifically, the first water inlet pipeline and the second water inlet pipeline of the water replenishment tee 3 are respectively connected to the water outlet pipeline of the coolant storage device 4 and the water outlet pipeline of the cooling device 1, and the water outlet pipeline of the water replenishment tee 3 is connected to the water inlet pipeline of the coolant drive device 2.

[0048] The twin electric drive axle cooling system provided in this embodiment is provided with a flow regulating device at the front end of the twin electric drive axles configured in parallel. The control device in the cooling circuit adjusts the flow rate of the coolant in the cooling branch of the twin electric drive axles by controlling the opening of the flow regulating device, thereby realizing on-demand distribution of the branch flow, reducing system energy consumption and improving cooling efficiency.

[0049] Embodiment 4

[0050] This embodiment provides a dual electric drive axle cooling system, which is different from the third embodiment in that: Figure 2 As shown, the cooling device 1 mainly includes a radiator 11 and a fan 12 . The fan 12 is arranged on one side of the radiator 11 to dissipate heat from the radiator 11 .

[0051] As an optional embodiment, the control device 7 mainly includes a motor controller and / or an all-in-one controller, that is, the control device 7 can be a motor controller, an all-in-one controller, or a motor controller and an all-in-one controller, and can also include other components that require heat dissipation. In addition, the position, quantity and connection method of each component in the control device 7 can be diverse; for example: the motor controller can be in front and the all-in-one controller can be in the back, or the all-in-one controller can be in front and the motor controller can be in the back; there can be two motor controllers; two motor controllers can be connected in series and then in parallel with the all-in-one controller, or two motor controllers can be connected in parallel with the all-in-one controller, and so on. In actual automobile assembly, the position, quantity and connection method of each component in the control device 7 can be reasonably planned according to actual conditions, as long as the corresponding control function can be achieved.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0053] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "connected" 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A cooling method for a dual electric drive axle, characterized in that: The method comprises: Get the driving status of the dual electric drive axle; In response to at least one bridge not working in the driving state, controlling the flow regulating device so that the cooling branches in the dual electric drive bridge are not connected to each other; In response to both bridges working normally in the driving state, acquiring temperature information of the dual electric drive bridge and the working state of the coolant drive device; According to the temperature information and the working state, the temperature and flow rate of the coolant in the cooling circuit and the flow rate of the coolant in the cooling branch of the dual electric drive axle are controlled.

2. The dual electric drive axle cooling method according to claim 1, characterized in that: The method for controlling the temperature and flow rate of the coolant in the cooling circuit and the flow rate of the coolant in the cooling branch of the dual electric drive axle according to the temperature information and the working state includes: In response to the temperature information being normal and the working state being normal, controlling the flow of coolant in the cooling circuit and the cooling branch of the dual electric drive axle; In response to the temperature information being normal, the working state being abnormal, and the temperature information exceeding a preconfigured temperature threshold, generating an alarm message; In response to the temperature information being normal, the working state being abnormal, and the temperature information not exceeding the preconfigured temperature threshold, controlling the temperature of the coolant in the cooling circuit so that the cooling circuit dissipates heat at a maximum heat dissipation capacity, and generating fault information; In response to the temperature information being abnormal and the working state being normal, controlling the temperature and flow rate of the coolant in the cooling circuit so that the cooling circuit dissipates heat at a maximum heat dissipation capacity, and generating fault information; In response to the temperature information being abnormal and the working state being abnormal, an alarm message is generated.

3. The dual electric drive axle cooling method according to claim 1 or 2, characterized in that: The method for controlling the temperature of a coolant in a cooling circuit comprises: The speed of the cooling device in the cooling circuit is controlled to adjust the temperature of the coolant in the cooling circuit.

4. The dual electric drive axle cooling method according to claim 1 or 2, characterized in that: The method for controlling the flow rate of coolant in a cooling circuit comprises: According to the temperature detection values ​​of the middle axle electric drive axle and the rear axle electric drive axle in the temperature information, the speed of the coolant driving device is controlled to adjust the flow rate of the coolant in the cooling circuit; The relationship between the flow rate of the coolant in the cooling circuit and the temperature information is: ， In the formula, Indicates the flow rate of coolant in the cooling circuit, Indicates the maximum output flow of the coolant drive unit, Respectively represent the temperature detection values ​​of the middle axle electric drive axle and the rear axle electric drive axle, Indicates the temperature reference value, which is equal to twice the preconfigured temperature threshold.

5. The dual electric drive axle cooling method according to claim 1 or 2, characterized in that: The method for controlling the flow rate of coolant in the cooling branch of the dual electric drive axle comprises: In response to the temperature detection value of the middle electric drive axle in the temperature information not being equal to the temperature detection value of the rear electric drive axle, controlling the opening of the flow regulating device to adjust the flow of coolant in the cooling branch of the dual electric drive axle until the temperature detection values ​​are equal; Among them, the relationship between the flow rate of the coolant in the cooling branch of the dual electric drive axle and the temperature information is: ， In the formula, Respectively represent the flow rate of coolant in the cooling branch of the middle axle electric drive axle and the rear axle electric drive axle, They respectively represent the temperature detection values ​​of the middle axle electric drive axle and the rear axle electric drive axle.

6. A dual electric drive axle cooling system, characterized in that: Used to implement the dual electric drive axle cooling method according to any one of claims 1 to 5, the system comprises: a cooling device, a coolant driving device, a control device, a flow regulating device and a dual electric drive axle, the dual electric drive axle comprising a middle axle electric drive axle and a rear axle electric drive axle configured in parallel; The water outlet pipeline of the cooling device is connected to the water inlet pipeline of the coolant driving device, the water outlet pipeline of the coolant driving device is connected to the water inlet pipeline of the control device, the water outlet pipeline of the control device is connected to the water inlet pipeline of the flow regulating device, the first water outlet pipeline of the flow regulating device is connected to the water inlet pipeline of the middle axle electric drive axle, the second water outlet pipeline of the flow regulating device is connected to the water inlet pipeline of the rear axle electric drive axle, and the water outlet pipeline of the middle axle electric drive axle and the water outlet pipeline of the rear axle electric drive axle are commonly connected to the water inlet pipeline of the cooling device; The control device is used to obtain the driving state, temperature information of the middle axle electric drive axle and the rear axle electric drive axle in the dual electric drive axle and the working state of the coolant drive device, and control the rotation speed of the cooling device and the coolant drive device and the opening of the flow regulating device according to the driving state, temperature information and working state, so as to adjust the temperature and flow of the coolant in the cooling circuit and the flow of the coolant in the cooling branch of the dual electric drive axle.

7. The dual electric drive axle cooling system according to claim 6, characterized in that: The middle axle electric drive axle and the rear axle electric drive axle are respectively equipped with drive motors for generating power, so that the middle axle electric drive axle and the rear axle electric drive axle can drive the vehicle together or individually.

8. The dual electric drive axle cooling system according to claim 6, characterized in that: Also includes: A temperature monitoring device for detecting the temperature of the coolant in the cooling branch of the dual electric drive axle, the temperature monitoring device comprising a first temperature sensor and a second temperature sensor; the first temperature sensor is arranged on the water inlet pipe of the middle bridge electric drive axle, and the temperature detection value is The second temperature sensor is arranged on the water inlet pipe of the rear axle electric drive axle, and the temperature detection value is .

9. The dual electric drive axle cooling system according to claim 6, characterized in that: Also includes: A coolant drive device for storing coolant and replenishing water in a cooling circuit, wherein a water outlet pipe of the coolant drive device is connected to a first water inlet pipe of a water replenishing tee, a second water inlet pipe of the water replenishing tee is connected to a water outlet pipe of the cooling device, and a water outlet pipe of the water replenishing tee is connected to a water inlet pipe of the coolant drive device.

10. The dual electric drive axle cooling system according to any one of claims 6 to 9, characterized in that: The cooling device includes a radiator and a fan arranged at one side of the radiator, and the fan is used for dissipating heat from the radiator.

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