Control method, control device, electronic device, and storage medium for electric vehicle

Abstract

This application belongs to the field of electric vehicle technology, specifically relating to a control method, control device, electronic equipment, and storage medium for an electric vehicle. This application aims to solve the problem of insufficient power in related electric trucks under heavy loads or when climbing hills. The control method, control device, electronic equipment, and storage medium of this application control the electric vehicle's drive mode to a dual-axle drive mode under heavy loads or when climbing hills, thereby achieving dual electric drive axles, making the electric truck more powerful. Furthermore, both electric drive axles have multiple gears, allowing for diverse power combinations to adapt to various working conditions and reducing the energy consumption of the electric vehicle.

Description

Technical Field

[0001] This application relates to the field of electric vehicle technology, and in particular to a control method, control device, electronic device, and storage medium for an electric vehicle. Background Technology

[0002] A truck is a freight vehicle primarily used for transporting goods or towing other vehicles. With the rapid development of electric vehicle technology, electric trucks have also become widely used. Electric trucks offer advantages such as high power, low or zero emissions, and compatibility with various vehicle types.

[0003] In related technologies, electric trucks generally include an electric drive axle, which includes an electric motor and a transmission system. The transmission system controls the electric motor to drive the wheels.

[0004] However, the electric trucks in question suffer from insufficient power when heavily loaded or climbing hills. Summary of the Invention

[0005] In view of this, the main objective of the embodiments of this application is to provide a control method, control device, electronic device and storage medium for electric vehicles to solve the technical problem of insufficient power of related electric trucks when under heavy load or climbing hills.

[0006] In a first aspect, embodiments of this application provide a control method for an electric vehicle, including:

[0007] Determine the drive mode of the electric vehicle;

[0008] According to the driving mode, at least one of the two electric drive axles of the electric vehicle is controlled to engage a gear.

[0009] Based on the driving signal of the electric vehicle, the electric drive axle that has entered the gear position is controlled to change gears.

[0010] In some embodiments that may include the above embodiments, the step of controlling at least one of the two electric drive axles of the electric vehicle to engage a gear according to the driving mode specifically includes:

[0011] If the driving mode is a dual-bridge driving mode, then both electric drive bridges are controlled to engage gears.

[0012] If the driving mode is a single-bridge driving mode, then one of the two electric drive bridges is controlled to engage a gear and the other is in neutral.

[0013] In some embodiments that may include the above embodiments, the driving mode is a dual-bridge driving mode;

[0014] The step of controlling the electric drive axle to change gears based on the driving signal of the electric vehicle specifically includes:

[0015] When the ignition signal of the electric vehicle is a power-on signal and the speed of the electric vehicle is higher than the first preset speed, at least one of the two electric drive axles is controlled to shift up.

[0016] When the ignition signal of the electric vehicle is a power reduction signal and the vehicle speed is lower than the second preset speed, at least one of the two electric drive axles is controlled to downshift, wherein the first preset speed is higher than the second preset speed.

[0017] In some embodiments that may include the above embodiments, if the driving mode is a single-axle driving mode, then controlling one of the two electric drive axles to engage a gear and the other to be in neutral specifically includes:

[0018] Compare the cumulative drive mileage of the two electric drive axles;

[0019] The system controls the electric drive axle with the lower accumulated drive mileage to engage a gear, while the other is in neutral.

[0020] In some embodiments that may include the above embodiments, if the driving mode is a single-axle driving mode, then after controlling one of the two electric drive axles to engage a gear and the other to be in neutral, the method further includes:

[0021] When the electric drive bridge in gear is faulty, first control the electric drive bridge in neutral to enter gear, and then control the faulty electric drive bridge to switch to neutral.

[0022] In some embodiments that may include the above embodiments, controlling the electric drive axle to change gears based on the driving signal of the electric vehicle specifically includes:

[0023] When the driving signal of the electric vehicle is a braking signal and the speed of the electric vehicle is lower than a third preset speed, at least one of the electric drive axles that is in gear is controlled to downshift.

[0024] In some embodiments that may include the above embodiments, the control method for the electric vehicle further includes:

[0025] The operating state of each motor in the electric drive axle that is engaged in gear is controlled based on at least one of the load state of the electric vehicle or the slope state of the road surface where the electric vehicle is located.

[0026] In some embodiments that may include the above embodiments, controlling the operating state of each motor in the electric drive axle that is engaged in gear according to at least one of the load state of the electric vehicle or the slope state of the road surface where the electric vehicle is located specifically includes:

[0027] When the electric vehicle is under heavy load and / or when the electric vehicle is going uphill, control all the motors in the electric drive axle that are in gear to work.

[0028] When the electric vehicle is in a light-load state and / or when the electric vehicle is going downhill, control one of the motors in the electric drive axle that is in gear to operate.

[0029] In some embodiments that may include the above embodiments, the step of controlling one of the motors in the electric drive axle that has entered gear to operate when the electric vehicle is in a light-load state and / or the electric vehicle is in a downhill state specifically includes:

[0030] Compare the cumulative operating time of each motor in the electric drive bridge that is engaged in the gear position;

[0031] The motor of the electric drive bridge that controls the gear shift operates with the motor that has the shortest cumulative operating time.

[0032] Secondly, embodiments of this application provide a control device for an electric vehicle, comprising:

[0033] A determining module is used to determine the driving mode of the electric vehicle;

[0034] The first control module is used to control at least one of the two electric drive axles of the electric vehicle to engage a gear according to the driving mode.

[0035] The second control module is used to control the electric drive axle to change gears based on the driving signal of the electric vehicle.

[0036] Thirdly, embodiments of this application provide an electronic device, including a memory and a processor, wherein the memory is used to store program instructions; and the processor is used to invoke the program instructions in the memory to execute the control method for an electric vehicle as described in the first aspect.

[0037] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program; when the computer program is executed, it implements the control method for an electric vehicle as described in the first aspect.

[0038] The electric vehicle control method, control device, electronic device, and storage medium provided in this application embodiment control the electric vehicle's drive mode to a dual-axle drive mode when under heavy load or climbing, so as to realize dual electric drive axle drive, making the electric truck more powerful. Moreover, both electric drive axles have multiple gears, making the electric vehicle's power combination diverse, which can adapt to various working conditions and reduce the energy consumption of the electric vehicle. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 A flowchart illustrating a control method for an electric vehicle provided in an embodiment of this application;

[0041] Figure 2 This is a schematic diagram of the structure of a control device for an electric vehicle provided in an embodiment of this application;

[0042] Figure 3 This is a schematic diagram of the structure of a control device for an electric vehicle provided in another embodiment of this application. Detailed Implementation

[0043] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0044] Secondly, it should be noted that in the description of the embodiments of this application, the terms "inner" and "outer" and other terms indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0045] Furthermore, it should be noted that, in the description of the embodiments of this application, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] As described in the background section, the problem of insufficient power in electric trucks under heavy loads or when climbing hills has been identified by the applicant through research. The reason for this problem is that electric trucks in the relevant technology only have one electric drive axle, which can only achieve single-axle drive. This results in limited power for the electric truck, leading to insufficient power and poor ability to get out of trouble when the electric truck is under heavy load or climbing hills. Moreover, the electric drive axle does not have gears, meaning that the electric drive axle cannot change gears. This results in a single power output combination for the electric truck. When the electric truck is unloaded, the motor load rate is low, which increases the energy consumption of the electric truck.

[0048] To address the aforementioned technical problems, embodiments of this application provide a control method, control device, electronic device, and storage medium for an electric vehicle. This method can control the electric vehicle's drive mode to a dual-axle drive mode during heavy loads or hill climbing, thereby achieving dual electric drive axles. This makes the electric truck more powerful, and both electric drive axles have multiple gears, allowing for diverse power combinations to adapt to various working conditions and reducing the electric vehicle's energy consumption.

[0049] The principles and features of the embodiments of this application are described below with reference to the accompanying drawings. The examples given are only used to explain the embodiments of this application and are not intended to limit the scope of the embodiments of this application.

[0050] Figure 1 A flowchart of a control method for an electric vehicle provided in an embodiment of this application is shown below. Figure 1 As shown, this embodiment provides a control method for an electric vehicle, which may include:

[0051] S110. Determine the driving mode of the electric vehicle.

[0052] In this embodiment, the electric vehicle may have a set of steering wheels, at least two sets of drive wheels, and at least two electric drive axles. Each electric drive axle is connected to a corresponding set of drive wheels to drive the corresponding set of drive wheels to rotate. The direction of travel of the electric vehicle is controlled by controlling the orientation of the steering wheels, and the drive wheels provide power to the electric vehicle.

[0053] Electric vehicles can have two drive modes: dual-axle drive and single-axle drive. In dual-axle drive mode, both electric drive axles operate, and each axle drives a corresponding set of drive wheels to rotate, resulting in more powerful performance. In single-axle drive mode, only one electric drive axle operates, which reduces energy consumption.

[0054] The driver can manually select the driving mode of the electric vehicle based on its load status and the gradient of the road surface. For example, the driver can select the driving mode by operating the gear shift lever. When the electric vehicle is heavily loaded or going uphill, the dual-axle drive mode can be selected to increase the vehicle's power and make it easier to get out of trouble. When the electric vehicle is lightly loaded or going downhill, the power required for operation is less, and the single-axle drive mode can be selected to reduce energy consumption.

[0055] S120: Control at least one of the two electric drive axles of the electric vehicle to engage a gear according to the drive mode.

[0056] Both electric drive axles can have a neutral gear and two drive gears, including first gear and second gear. The electric vehicle has greater power when the electric drive axle is in second gear than when it is in first gear.

[0057] Each electric drive axle of an electric vehicle may include a motor and a shift actuator. The motor drives the drive wheels to rotate, and the shift actuator can switch the electric drive axle between drive gears (up from first gear to second gear, or down from second gear to first gear) or return the drive axle to neutral.

[0058] In some embodiments, one possible implementation of S120 is as follows:

[0059] S1210. If the electric vehicle's drive mode is dual-axle drive mode, then control both electric drive axles to engage gears.

[0060] After the electric vehicle starts, if the driver selects the dual-axle drive mode, both electric drive axles can be controlled to enter first gear so that the electric vehicle can start quickly.

[0061] S1220. If the electric vehicle is driven in a single-axle drive mode, then one of the two electric drive axles is engaged in gear and the other is in neutral.

[0062] In single-axle drive mode, only one of the two electric drive axles drives its corresponding drive wheel, while the other electric drive axle does not work.

[0063] S130: Based on the driving signal of the electric vehicle, control the electric drive axle to change gears.

[0064] The driving signals of electric vehicles can include ignition signals, brake signals, etc. Ignition signals can include power-on signals and power-off signals. When the driver presses the ignition pedal down more, the ignition signal is a power-on signal; when the driver releases the ignition pedal at least partially, the ignition signal is a power-off signal.

[0065] The brake signal is triggered when the driver presses the brake pedal.

[0066] When the driving signal of an electric vehicle is a power-on signal, the electric drive axle in the gear position can be controlled to shift up, such as from first gear to second gear.

[0067] When the driving signal of an electric vehicle is a braking signal or a power reduction signal, the electric drive axle in the gear position can be controlled to downshift, such as from second gear to first gear.

[0068] It should be noted that when the electric drive axle controlling the gear shifting performs gear changes, it shifts between different drive gears. For example, upshifting from first to second gear, and downshifting from second to first gear. If the electric drive axle is already in second gear, it will remain in second gear even if the electric vehicle's driving signal is an energizing signal. Conversely, if the electric drive axle is already in first gear, it will remain in first gear even if the electric vehicle's driving signal is a de-energizing signal or a braking signal.

[0069] Following S1210, one possible implementation of S130 is as follows:

[0070] S1311 When the ignition signal of the electric vehicle is a power-on signal and the speed of the electric vehicle is higher than the first preset speed, control at least one of the two electric drive axles to shift up.

[0071] When the ignition signal of an electric vehicle is a power-on signal, it indicates that the electric vehicle is continuously accelerating. When the vehicle speed reaches or exceeds the first preset speed, the power required for continued acceleration increases. Therefore, at least one of the two electric drive axles is controlled to upshift to meet the power demand for acceleration. In addition, when the vehicle speed reaches or exceeds the first preset speed, at least one of the two electric drive axles is controlled to upshift again to ensure stable driving when shifting from first gear to second gear, preventing the electric vehicle from shaking due to large speed changes.

[0072] S1312. When the ignition signal of the electric vehicle is a de-energizing signal and the vehicle speed is lower than the second preset speed, control at least one of the two electric drive axles to downshift, wherein the first preset speed is higher than the second preset speed.

[0073] When the ignition signal of an electric vehicle is a power reduction signal, it indicates that the electric vehicle is continuously decelerating. When the vehicle speed decreases to or below the second preset speed, at least one of the two electric drive axles is controlled to downshift. On the one hand, when the vehicle speed decreases to or below the second preset speed, the power required for the electric vehicle to move decreases. At this time, controlling at least one of the electric drive axles in gear to downshift reduces the energy consumption of the electric vehicle. On the other hand, when the vehicle speed decreases to or below the second preset speed, the electric drive axle is downshifted from second gear to first gear, so that the electric vehicle can still drive stably during downshifting and avoids shaking due to excessive speed changes.

[0074] Following S1210, another possible implementation of S130 is:

[0075] S1321. When the ignition signal of the electric vehicle is a power-on signal and the vehicle speed is higher than the first acceleration speed, control one of the two electric drive axles to shift up. When the vehicle speed is higher than the second acceleration speed, control the other of the two electric drive axles to shift up as well, wherein the second acceleration speed is greater than the first acceleration speed.

[0076] When both electric drive axles are in first gear, if the electric vehicle accelerates to the first acceleration speed, only one of the two electric drive axles is controlled to shift to second gear to increase the power of the electric vehicle and allow the vehicle speed to increase further. When the speed of the electric vehicle continues to increase to the second acceleration speed, the other electric drive axle that is still in first gear is also controlled to shift to second gear to further increase the power of the electric vehicle.

[0077] The two electric drive axles shift gears at different speed points, which makes the speed change of the electric vehicle more stable when shifting gears. It also allows for a variety of power output combinations from the motor, making it suitable for various working conditions.

[0078] S1322. When the ignition signal of the electric vehicle is a deceleration signal and the vehicle speed is lower than the first deceleration speed, control one of the two electric drive axles to downshift. When the vehicle speed is lower than the second deceleration speed, control the other of the two electric drive axles to downshift as well, wherein the second deceleration speed is lower than the first deceleration speed.

[0079] When both electric drive axles are in second gear, if the electric vehicle decelerates to the first deceleration speed, only one of the two electric drive axles is controlled to downgrade to first gear to reduce the energy consumption of the electric vehicle; when the speed of the electric vehicle continues to decrease to the second deceleration speed, the other electric drive axle that is still in second gear is also controlled to downgrade to first gear to further reduce the energy consumption of the electric vehicle.

[0080] The two electric drive axles downshift at different speed points, which makes the speed change of the electric vehicle more stable during downshifting. It also allows for a variety of power output combinations from the motor, making it suitable for various working conditions.

[0081] S1220 may specifically include:

[0082] S1221. Compare the cumulative driving mileage of the two electric drive axles.

[0083] The cumulative driving mileage of an electric drive axle refers to the total distance traveled by the corresponding drive wheel driven by the electric drive axle.

[0084] S1222: Control the one with the lower accumulated drive mileage among the two electric drive axles to engage gear, and the other to be in neutral.

[0085] The electric drive axle with less accumulated driving mileage has lower aging and wear levels and is less prone to failure compared to the electric drive axle with more driving mileage. Therefore, the electric drive axle with less accumulated driving mileage is preferred to operate so that the electric vehicle is less likely to fail during operation.

[0086] Following S1220, control methods for electric vehicles may also include:

[0087] S1230. When there is a fault in the electric drive bridge that is in gear, first control the electric drive bridge that is in neutral to enter gear, and then control the faulty electric drive bridge to switch to neutral.

[0088] When an electric vehicle has one of its two electric drive axles engaged in gear and the other in neutral, if the engaged axle malfunctions—for example, if the motor or shift actuator of the engaged axle fails—the system first controls the neutral axle to engage in gear so that it can drive the corresponding drive wheel. Then, the faulty axle is switched back to neutral to stop working, allowing the electric vehicle to travel normally under the drive of one of the two axles.

[0089] S130 may also include:

[0090] S1330 When the driving signal of the electric vehicle is a brake signal and the speed of the electric vehicle is lower than the third preset speed, control at least one of the electric drive axles that is in gear to downshift.

[0091] When the driving signal of an electric vehicle is a brake signal, it means that the brake pedal of the electric vehicle has been pressed, and the speed of the electric vehicle will gradually decrease. When the speed decreases to the third preset speed or below, at least one of the electric drive axles in the gear position is controlled to downshift. On the one hand, when the speed decreases to the third preset speed or below, the power required for the electric vehicle to drive decreases. At this time, controlling at least one of the electric drive axles in the gear position to downshift reduces the energy consumption of the electric vehicle. On the other hand, when the speed decreases to the third preset speed or below, the electric drive axle in the gear position is controlled to downshift so that the electric vehicle can still drive stably during downshifting and avoid the electric vehicle shaking due to excessive speed change.

[0092] In some embodiments, the control method for an electric vehicle may further include:

[0093] S140. Control the operating state of each motor in the electric drive axle that is engaged in gear according to at least one of the load state of the electric vehicle or the slope state of the road surface where the electric vehicle is located.

[0094] The load conditions of electric vehicles can include heavy load and light load. Under heavy load, the electric vehicle carries a large weight and requires a large amount of power to move. Under light load, the electric vehicle carries a small weight and requires a small amount of power to move.

[0095] The slope of the road surface where electric vehicles are located can include uphill, downhill, and flat road conditions. Compared with flat road conditions, electric vehicles require more power when going uphill and less power when going downhill.

[0096] By controlling the operating status of each motor in the electric drive axle when shifting gears based on the load condition of the electric vehicle or the slope of the road surface, the number of operating motors can correspond to the power required for the electric vehicle to move. When the power required for the electric vehicle is low, fewer motors operate to reduce energy consumption. Conversely, when the power required for the electric vehicle is high, more motors operate to ensure sufficient power for the electric vehicle to move.

[0097] In some embodiments, one possible implementation of S140 is as follows:

[0098] S1410. When the electric vehicle is under heavy load and / or the electric vehicle is going uphill, control all motors in the electric drive axle that are in gear to work.

[0099] Each electric drive axle may include at least two motors. This embodiment describes the situation with each electric drive axle having two motors as an example. When the electric vehicle is under heavy load and / or going uphill, if the electric vehicle's drive mode is dual-axle drive mode, all motors in the two electric drive axles that are engaged in gear can be controlled to work, that is, all four motors corresponding to the two electric drive axles are working. If the electric vehicle's drive mode is single-axle drive mode, both motors in the electric drive axle that is engaged in gear can be controlled to work, thereby improving the electric vehicle's power and enabling the electric vehicle to drive normally or easily go uphill.

[0100] S1420. When the electric vehicle is in a light-load state and / or the electric vehicle is in a downhill state, control one of the motors in the electric drive axle that is in gear to work.

[0101] When the electric vehicle is under light load and / or going downhill, if the electric vehicle is in dual-axle drive mode, one motor in the electric drive axle that is engaged in gear can be controlled to work, meaning that two motors work in total for the two electric drive axles. If the electric vehicle is in single-axle drive mode, one motor in the electric drive axle that is engaged in gear can be controlled to work, meaning that the electric vehicle is driven by one electric drive axle, and only one motor in this electric drive axle is working, in order to reduce the energy consumption of the electric vehicle.

[0102] In some embodiments, one possible implementation of S1420 is as follows:

[0103] S1421. Compare the cumulative working time of each motor in the electric drive bridge that is engaged in the gear position.

[0104] This embodiment describes the situation with each electric drive axle having two motors as an example. When the electric vehicle is in single-axle drive mode, the electric drive axle in gear includes two motors. The cumulative working time of the two motors driving the drive wheels may be different. Comparing the cumulative working time of the two motors driving the drive wheels, the motor with the longer cumulative working time has a higher degree of aging and wear.

[0105] S1422, The motor with the shorter cumulative working time among the motors of the electric drive bridge that controls the gear shift operates.

[0106] Of the two motors in the drive axle, the motor with less accumulated working time has lower aging and wear levels and is less prone to failure. Controlling the operation of this motor can reduce the risk of electric vehicles malfunctioning during operation.

[0107] The apparatus for implementing the above method will now be described.

[0108] Figure 2 This is a schematic diagram of the structure of a control device for an electric vehicle provided in an embodiment of this application, as shown below. Figure 2 As shown, the control device for the electric vehicle provided in this embodiment includes: a determination module 210, a first control module 220, and a second control module 230.

[0109] The determination module 210 is used to determine the driving mode of the electric vehicle.

[0110] The first control module 220 is used to control at least one of the two electric drive axles of the electric vehicle to engage a gear according to the drive mode.

[0111] The second control module 230 is used to control the electric drive axle to change gears based on the driving signal of the electric vehicle.

[0112] Optionally, the control device for the electric vehicle may further include a third control module 240 for controlling the operating state of each motor in the electric drive axle that is engaged in gear, based on at least one of the load state of the electric vehicle or the slope state of the road surface where the electric vehicle is located.

[0113] Optionally, the first control module 220 may include a first sub-control module 2210, a second sub-control module 2220, and a third sub-control module 2230.

[0114] The first sub-control module 2210 is used to control both electric drive axles to engage gears if the electric vehicle's drive mode is a dual-axle drive mode.

[0115] The second sub-control module 2220 controls one of the two electric drive axles to engage a gear and the other to neutral if the electric vehicle's drive mode is single-axle drive mode.

[0116] The third sub-control module 2230 is used to, when there is a fault in the electric drive bridge that is in gear, first control the electric drive bridge that is in neutral to enter gear, and then control the faulty electric drive bridge to switch to neutral.

[0117] Optionally, the second sub-control module 2220 may include a first comparison module 2221 and a fourth sub-control module 2222.

[0118] The first comparison module 2221 is used to compare the cumulative drive mileage of the two electric drive bridges.

[0119] The fourth sub-control module 2222 is used to control the one with the less accumulated drive mileage of the two electric drive axles to enter gear and the other to be in neutral.

[0120] In some embodiments, the second control module 230 may include a fifth sub-control module 2311 and a sixth sub-control module 2312.

[0121] The fifth sub-control module 2311 is used to control at least one of the two electric drive axles to shift up when the ignition signal of the electric vehicle is a power-on signal and the vehicle speed of the electric vehicle is higher than the first preset speed.

[0122] The sixth sub-control module 2312 is used to control at least one of the two electric drive axles to downshift when the ignition signal of the electric vehicle is a de-energizing signal and the vehicle speed of the electric vehicle is lower than the second preset speed, wherein the first preset speed is higher than the second preset speed.

[0123] In some other embodiments, the second control module 230 may include a seventh sub-control module 2321 and an eighth sub-control module 2322.

[0124] The seventh sub-control module 2321 is used to control one of the two electric drive axles to shift up when the ignition signal of the electric vehicle is a power-on signal and the vehicle speed is higher than the first acceleration speed, and to control the other of the two electric drive axles to shift up when the vehicle speed is higher than the second acceleration speed, wherein the second acceleration speed is greater than the first acceleration speed.

[0125] The eighth sub-control module 2322 is used to control one of the two electric drive axles to downshift when the electric vehicle's ignition signal is a deceleration signal and the electric vehicle's speed is lower than the first deceleration speed, and to control the other of the two electric drive axles to downshift when the electric vehicle's speed is lower than the second deceleration speed, wherein the second deceleration speed is lower than the first deceleration speed.

[0126] Optionally, the second control module 230 may further include a ninth sub-control module 2330, used to control at least one of the electric drive axles that is in gear to downshift when the driving signal of the electric vehicle is a braking signal and the speed of the electric vehicle is lower than a third preset speed.

[0127] Optionally, the third control module 240 may include a tenth sub-control module 2410 and an eleventh sub-control module 2420.

[0128] The tenth sub-control module 2410 is used to control the operation of all motors in the electric drive axle that is in gear when the electric vehicle is under heavy load and / or when the electric vehicle is going uphill.

[0129] The eleventh sub-control module 2420 is used to control the operation of one of the motors in the electric drive axle when the electric vehicle is in a light load state and / or when the electric vehicle is in a downhill state.

[0130] Optionally, the eleventh sub-control module 2420 may include a second comparison module 2421 and an eleventh sub-control module 2422.

[0131] The second comparison module 2421 is used to compare the cumulative working time of each motor in the electric drive bridge that has entered the gear position.

[0132] The eleventh sub-control module 2422 is used to control the motor of the electric drive bridge that has accumulated the least working time to operate when it enters the gear position.

[0133] The electric vehicle control device described above in this embodiment can be used to execute the technical solutions in the above electric vehicle control method embodiments. Its implementation principle and technical effect are similar, and will not be repeated here.

[0134] Figure 3 This is a schematic diagram of the structure of a control device for an electric vehicle provided in another embodiment of this application, as shown below. Figure 3 As shown, the control device of the electric vehicle can be a network device or a chip of a network device. The control device of the electric vehicle may include at least one processor 31 and a memory 32. Figure 3 The diagram illustrates a control unit for an electric vehicle, exemplified by a processor.

[0135] Memory 32 is used to store programs. Specifically, the program may include program code, which includes computer operation instructions. Memory 32 may include random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage device.

[0136] The processor 31 is used to execute the computer execution instructions stored in the memory 32 to implement the electric vehicle control method in the above embodiment. Its implementation principle and technical effect are similar, and will not be described again here.

[0137] The processor 31 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0138] Optionally, in specific implementations, if the communication interface, memory 32, and processor 31 are implemented independently, they can be interconnected via a bus to complete communication. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc., but this does not imply that there is only one bus or one type of bus.

[0139] Optionally, in a specific implementation, if the communication interface, memory 32, and processor 31 are integrated on a single chip, then the communication interface, memory 32, and processor 31 can communicate with each other through an internal interface.

[0140] The electric vehicle control device described above in this embodiment can be used to execute the technical solutions in the above electric vehicle control method embodiments. Its implementation principle and technical effect are similar, and will not be repeated here.

[0141] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A control method for an electric vehicle, characterized in that, include: The drive mode of the electric vehicle is determined, including a dual-axle drive mode and a single-axle drive mode; the electric vehicle includes two electric drive axles, the dual-axle drive mode is used to indicate that both electric drive axles are engaged in gear; the single-axle drive mode is used to indicate that one of the two electric drive axles is engaged in gear and the other is in neutral. According to the driving mode, at least one of the two electric drive axles of the electric vehicle is controlled to engage a gear. Based on the driving signal of the electric vehicle, the electric drive axle that has entered the gear position is controlled to change gears; If the driving mode is a dual-axle drive mode, then controlling the electric drive axle to change gears according to the driving signal of the electric vehicle specifically includes: When the ignition signal of the electric vehicle is a power-on signal and the vehicle speed is higher than the first acceleration speed, at least one of the two electric drive axles that are in gear is controlled to upshift; when the ignition signal is a power-on signal and the vehicle speed is higher than the second acceleration speed, the other of the two electric drive axles that are in gear is controlled to upshift, where the second acceleration speed is greater than the first acceleration speed. When the ignition switch signal is a deceleration signal and the vehicle speed is lower than the first deceleration speed, at least one of the two electric drive axles in the gear position is controlled to downshift; when the ignition switch signal is a deceleration signal and the vehicle speed is lower than the second deceleration speed, the other of the two electric drive axles in the gear position is controlled to downshift, where the second deceleration speed is lower than the first deceleration speed.

2. The control method for an electric vehicle according to claim 1, characterized in that, The step of controlling at least one of the two electric drive axles of the electric vehicle to engage a gear according to the driving mode specifically includes: If the driving mode is a dual-bridge driving mode, then both electric drive bridges are controlled to engage gears. If the driving mode is a single-bridge driving mode, then one of the two electric drive bridges is controlled to engage a gear and the other is in neutral.

3. The control method for an electric vehicle according to claim 2, characterized in that, If the driving mode is a single-axle driving mode, then one of the two electric drive axles is controlled to engage a gear and the other to be in neutral, specifically including: Compare the cumulative drive mileage of the two electric drive axles; The system controls the electric drive axle with the lower accumulated drive mileage to engage a gear, while the other is in neutral.

4. The control method for an electric vehicle according to claim 2, characterized in that, If the driving mode is a single-axle driving mode, then after controlling one of the two electric drive axles to engage a gear and the other to neutral, the method further includes: When the electric drive bridge in gear is faulty, first control the electric drive bridge in neutral to enter gear, and then control the faulty electric drive bridge to switch to neutral.

5. The control method for an electric vehicle according to any one of claims 1-4, characterized in that, The step of controlling the electric drive axle to change gears based on the driving signal of the electric vehicle specifically includes: When the driving signal of the electric vehicle is a braking signal and the speed of the electric vehicle is lower than a third preset speed, at least one of the electric drive axles that is in gear is controlled to downshift.

6. The control method for an electric vehicle according to any one of claims 1-4, characterized in that, Also includes: The operating state of each motor in the electric drive axle that is engaged in gear is controlled based on at least one of the load state of the electric vehicle or the slope state of the road surface where the electric vehicle is located.

7. The control method for an electric vehicle according to claim 6, characterized in that, The step of controlling the operating state of each motor in the electric drive axle when the gear is engaged, based on at least one of the load state of the electric vehicle or the slope state of the road surface where the electric vehicle is located, specifically includes: When the electric vehicle is under heavy load and / or when the electric vehicle is going uphill, control all the motors in the electric drive axle that are in gear to work. When the electric vehicle is in a light-load state and / or when the electric vehicle is going downhill, control one of the motors in the electric drive axle that is in gear to operate.

8. The control method for an electric vehicle according to claim 7, characterized in that, When the electric vehicle is in a light-load state and / or the electric vehicle is in a downhill state, controlling one of the motors in the electric drive axle that has entered gear mode to operate specifically includes: Compare the cumulative operating time of each motor in the electric drive bridge that is engaged in the gear position; The motor of the electric drive bridge that controls the gear shift operates with the motor that has the shortest cumulative operating time.

9. A control device for an electric vehicle, characterized in that, include: A determining module is used to determine the driving mode of the electric vehicle, the driving mode including a dual-axle driving mode and a single-axle driving mode; the electric vehicle includes two electric drive axles, the dual-axle driving mode is used to indicate that both electric drive axles are engaged in gear; the single-axle driving mode is used to indicate that one of the two electric drive axles is engaged in gear and the other is in neutral. The first control module is used to control at least one of the two electric drive axles of the electric vehicle to engage a gear according to the driving mode. The second control module is used to control the electric drive axle to change gears based on the driving signal of the electric vehicle. If the driving mode is a dual-axle drive mode, then the second control module is specifically used to control at least one of the two electric drive axles that are engaged in gear to upshift when the ignition signal of the electric vehicle is a power-on signal and the vehicle speed of the electric vehicle is higher than the first acceleration speed; and to control the other of the two electric drive axles that are engaged in gear to upshift when the ignition signal is a power-on signal and the vehicle speed is higher than the second acceleration speed, wherein the second acceleration speed is greater than the first acceleration speed. When the ignition switch signal is a deceleration signal and the vehicle speed is lower than the first deceleration speed, at least one of the two electric drive axles in the gear position is controlled to downshift; when the ignition switch signal is a deceleration signal and the vehicle speed is lower than the second deceleration speed, the other of the two electric drive axles in the gear position is controlled to downshift, where the second deceleration speed is lower than the first deceleration speed.

10. An electronic device, characterized in that, include: Memory and processor; The memory is used to store program instructions; The processor is used to invoke program instructions in the memory to execute the control method of the electric vehicle as described in any one of claims 1-8.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program; when the computer program is executed, it implements the control method for an electric vehicle as described in any one of claims 1-8.

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