Electric vehicle motor drive control method, device, electric vehicle and medium

Abstract

The present invention discloses a motor drive control method, device, electric vehicle and medium for an electric vehicle. The method comprises: after the vehicle enters a normal driving condition, performing brake signal detection; if a brake signal is detected, determining the current recovery power of brake energy recovery; if the current recovery power is greater than a set first power limit, controlling the motor drive system to enter a dual-motor working mode to perform brake energy recovery in the dual-motor working mode. The present application determines the working mode of the motor from multiple dimensions such as the influence of the brake signal, the influence of the dual motors on brake energy recovery, and the switching of single and dual motors caused by the motor power limit, so as to maximize the recovery capacity of the system, improve the system efficiency, avoid power waste, and switch the motor working mode according to the output speed value and the actual power required, so as to avoid the problem of slow system power response caused by the immediate conversion to the dual-motor working mode due to the large torque required in the starting stage.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a motor drive control method, device, vehicle and medium for an electric vehicle. Background Art

[0002] For pure electric vehicles, especially medium and heavy-duty pure electric vehicles, in order to take into account low-speed power, vehicle maximum speed and system efficiency, a dual-motor multi-speed drive system configuration is adopted, so that the vehicle power can be guaranteed through low gear and the vehicle maximum speed can be guaranteed through high gear.

[0003] For the dual-motor multi-speed drive system, it is mainly divided into two working modes: single-motor working and dual-motor working. Generally, the working mode will be switched during the driving process of the vehicle. The working mode adopted by the motor drive will affect the maximum output power, power response and system efficiency of the whole vehicle system. Therefore, how to ensure that the motor drive system is in a more reasonable working mode when the vehicle is driving has become a more concerned issue at present.

[0004] At present, the working mode adopted by the motor drive in pure electric vehicles is mainly determined based on relatively single dimensions such as the required torque and vehicle speed related signals. However, for different types of pure electric vehicles, there are some electric vehicles (such as medium and heavy-duty electric vehicles) that require a large power at the start stage in many cases because of the large changes in load. If the working mode is determined only by the above method, it will cause the vehicle to immediately switch from a single motor to a dual-motor joint drive after starting, resulting in slow system power response. In addition, some other requirements during the driving process of electric vehicles, such as energy recovery requirements, will also cause power waste and low system efficiency due to unreasonable determined working modes if the working mode is determined only by the above method. Summary of the invention

[0005] The present invention provides a motor drive control method for an electric vehicle, so as to realize effective conversion of the motor drive mode and improve the system efficiency of the electric vehicle.

[0006] According to one aspect of the present invention, a motor drive control method for an electric vehicle is provided, the method comprising:

[0007] After the vehicle enters normal driving conditions, brake signal detection is performed;

[0008] If a braking signal is detected, the current recovery power of the braking energy recovery is determined;

[0009] If the current recovery power is greater than the set first power limit, the motor drive system is controlled to enter the dual-motor working mode to perform braking energy recovery in the dual-motor working mode.

[0010] According to another aspect of the present invention, there is provided a motor drive control device for an electric vehicle, the device comprising:

[0011] A detection module, used to detect brake signals after the vehicle enters normal driving conditions;

[0012] A determination module, configured to determine a current recovery power of the braking energy recovery if a braking signal is detected;

[0013] The recovery module is used to control the motor drive system to enter a dual-motor working mode if the current recovery power is greater than a set first power limit value, so as to perform braking energy recovery in the dual-motor working mode.

[0014] According to another aspect of the present invention, an electric vehicle is provided, the electric vehicle comprising:

[0015] A dual-motor drive system, the dual-motor drive system comprising dual motors and corresponding multi-speed reducers;

[0016] one or more controllers;

[0017] A memory in communication with the at least one controller; wherein,

[0018] The memory stores a computer program executable by the at least one controller, and the computer program is executed by the at least one controller to enable the at least one controller to perform the motor drive control method of the electric vehicle.

[0019] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to implement the motor drive control method of the electric vehicle when executed by a controller.

[0020] The embodiment of the present invention provides a motor drive control method, device, electric vehicle and medium for an electric vehicle, the method comprising: after the vehicle enters a normal driving condition, performing brake signal detection; if a brake signal is detected, determining the current recovery power of brake energy recovery; if the current recovery power is greater than the set first power limit, controlling the motor drive system to enter a dual-motor working mode to perform brake energy recovery in the dual-motor working mode. The single and dual motor working modes are determined from multiple dimensions such as the influence of brake signals, the influence of dual motors on brake energy recovery, and the switching of single and dual motors caused by motor power limits, so as to maximize the recovery capacity of the system, improve system efficiency, avoid power waste, and switch the motor working mode according to the output speed value and the actual power required, so as to avoid the problem of slow system power response caused by the large torque required in the starting stage in the prior art and the immediate conversion to the dual-motor working mode.

[0021] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 creative work.

[0023] Figure 1 is a flow chart of a motor drive control method for an electric vehicle provided according to Embodiment 1 of the present invention;

[0024] Figure 2 is a flow chart of a motor drive control method for an electric vehicle provided according to a second embodiment of the present invention;

[0025] Figure 3 is a structural schematic diagram of a motor drive control device for an electric vehicle provided according to a third embodiment of the present invention;

[0026] Figure 4 It is a structural schematic diagram of an electric vehicle provided in Embodiment 4 of the present invention. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] Embodiment 1

[0030] Figure 1 A flowchart of a motor drive control method for an electric vehicle is provided for the first embodiment of the present invention. This embodiment is applicable to medium and heavy-duty pure electric vehicles. The method can be executed by a motor drive control device for an electric vehicle. The motor drive control device for an electric vehicle can be implemented in the form of hardware and / or software. The motor drive control device for an electric vehicle can be configured in an electric vehicle. Figure 1 As shown, the method includes:

[0031] S110: After the vehicle enters a normal driving condition, a brake signal detection is performed.

[0032] In this embodiment, the normal driving condition can be understood as the normal driving condition after the vehicle is powered on and started. The brake signal can be understood as the signal sent by the vehicle controller to perform a brake operation.

[0033] Specifically, in this step, when the vehicle enters the normal driving condition, in order to meet the power response mechanism, the electric vehicle will detect in real time whether the vehicle control system wants to brake the vehicle and whether a brake signal is generated. If a brake signal is detected, the energy recovery operation is performed. By switching between single and double motors, incomplete energy recovery is avoided to prevent excessive energy waste.

[0034] S120: If it is detected that a braking signal currently exists, determine the current recovery power of the braking energy recovery.

[0035] In this embodiment, the braking energy recovery can be understood as the energy that can be recovered when the vehicle is braked. The current recovery power can be understood as the power required to recover the energy generated by braking when braking occurs.

[0036] Specifically, this step can calculate the recoverable energy generated during the braking process and the power required to recover the energy when a brake signal is detected, and achieve complete recovery of the energy generated by braking by providing corresponding power.

[0037] S130: If the current recovery power is greater than the set first power limit, control the motor drive system to enter the dual-motor working mode to perform braking energy recovery in the dual-motor working mode.

[0038] In this embodiment, the first power limit value can be understood as the maximum power that can be recovered by a single motor. The dual-motor working mode can be understood as a mode in which two motors are turned on at the same time to provide power for the vehicle.

[0039] Specifically, in this step, the power required for recovering braking energy can be compared with the maximum power that a single motor can achieve based on the calculated power. If the required power is less than the power that a single motor can provide, then a single motor is maintained for recovery. If the required power is greater than the maximum power that a single motor can provide, then the vehicle is controlled to operate in dual-motor mode, with two motors providing power for braking energy recovery at the same time, thereby achieving complete recovery of braking energy and avoiding energy loss due to untimely energy recovery.

[0040] The first embodiment of the present invention provides a motor drive control method for an electric vehicle. The method includes: after the vehicle enters a normal driving condition, performing brake signal detection; if a brake signal is detected, determining the current recovery power of brake energy recovery; if the current recovery power is greater than the set first power limit, controlling the motor drive system to enter a dual-motor working mode to perform brake energy recovery in the dual-motor working mode. The single and dual motor working modes are determined from multiple dimensions such as the influence of brake signals, the influence of dual motors on brake energy recovery, and the switching of single and dual motors caused by motor power limits, so as to maximize the recovery capacity of the system, improve system efficiency, avoid power waste, and switch the motor working mode according to the output speed value and the actual power required, so as to avoid the problem of slow system power response caused by the large torque required in the starting stage in the prior art and the immediate conversion to the dual-motor working mode.

[0041] As a first optional embodiment of the first embodiment, based on the above embodiment, during the motor drive control process of the electric vehicle, the following is further included:

[0042] If the current recovery power is less than or equal to the set first power limit, the motor drive system is controlled to maintain the current working mode unchanged. Specifically, in this step, during the braking process, if the power required for the recovery braking to generate energy is less than the maximum power that a single motor can provide, it means that the power that a single motor can provide is sufficient to recover the energy generated by the braking. At this time, it is only necessary to maintain the current single-motor working mode, and there is no need to start the dual-motor mode.

[0043] As a second optional embodiment of the first embodiment, based on the above embodiment, during the motor drive control process of the electric vehicle, the process further includes:

[0044] If it is detected that there is no brake signal at present, the output shaft speed of the vehicle is obtained, and the working mode of the motor drive system is controlled according to the comparison result between the output shaft speed and the set speed threshold.

[0045] In this embodiment, the output speed value can be understood as the speed of the wheels when the vehicle is traveling at the current speed. The set speed threshold can be understood as the speed corresponding to the maximum power that can be provided by a single motor set in advance without braking.

[0046] Specifically, in this step, when no braking signal is detected during driving, it means that at this time, there is no energy generated by braking, and there is no need to control the motor working mode for energy recovery. Instead, the motor working mode is switched to provide sufficient power for the normal advancement of the vehicle to meet the vehicle's power response.

[0047] Embodiment 2

[0048] Figure 2 This is a flow chart of a motor drive control method for an electric vehicle provided in the second embodiment of the present invention. The technical solution of this embodiment is further refined on the basis of the above technical solution. Figure 2 As shown, the method includes:

[0049] S201. After the vehicle enters a normal driving condition, a brake signal detection is performed.

[0050] S202: If it is detected that a braking signal currently exists, determine the current recovery power of the braking energy recovery.

[0051] S203: If it is detected that there is no brake signal currently, the output shaft speed of the vehicle is obtained.

[0052] S204: Compare the output shaft speed with a set speed threshold.

[0053] In this embodiment, the output speed value can be understood as the current speed of the vehicle. The set speed threshold can be understood as the maximum value of the speed provided by the dual motors in advance without braking.

[0054] Specifically, this step can compare the current vehicle speed with a set speed threshold when the vehicle has no braking signal, so as to switch the motor working mode in time according to the speed, increase the vehicle speed or maintain the current vehicle speed.

[0055] S205: Determine whether the output shaft speed is less than or equal to a set speed threshold.

[0056] S206: If the comparison result is that the output shaft speed is less than or equal to the set speed threshold, the motor drive system is controlled to enter or maintain the dual-motor working mode.

[0057] Specifically, in this step, when the output speed value is less than the set threshold, it indicates that the vehicle speed has not reached the pre-set speed. This indicates that the vehicle is in the starting stage and more power is needed through the dual-motor mode to accelerate the vehicle to the required speed.

[0058] S207: If the comparison result shows that the output shaft speed is greater than the set speed threshold, the set speed-power limit association table is searched to determine the target power limit corresponding to the output shaft speed.

[0059] In this embodiment, the speed-power limit value association table can be understood as a pre-set comparison table of different speeds corresponding to different powers. The target power limit value can be understood as the power required to meet the current vehicle speed.

[0060] Specifically, in this step, when the vehicle speed reaches or exceeds the threshold, it indicates that there is no need to continue to speed up, and it is only necessary to find the target power corresponding to the current speed in the speed power table to maintain the current vehicle speed.

[0061] S208 . Controlling the working mode of the motor drive system according to a comparison result between the current required power of the vehicle and the target power limit.

[0062] In this embodiment, the current required power may be understood as the power required to meet the current operating conditions of the vehicle.

[0063] In this embodiment, the above steps can be further specified as follows:

[0064] A. Obtain the current required power corresponding to the vehicle in the current driving scenario, and compare the current required power with the target power limit.

[0065] Specifically, in this step, the power required to maintain the current vehicle running speed may be compared with the power corresponding to the target speed, and the motor working mode may be switched according to the comparison result.

[0066] B. If the current required power is greater than the target power limit, the motor drive system is controlled to enter or maintain a dual-motor operating mode.

[0067] Specifically, in this step, if the current mode is single-motor drive, in order to ensure the vehicle's dynamic response, when the required power is greater than the limit value obtained by looking up the table, it indicates that the current power cannot meet the demand. At this time, the dual-motor drive mode is immediately entered, and the gear corresponding to the dual-motor drive is determined based on the output shaft speed and the required power.

[0068] C. If the current required power is less than or equal to the target power limit, it is determined whether the current accumulated time for entering the dual-motor working mode is less than the set time value.

[0069] In this embodiment, the current accumulated time may be understood as the duration of switching to the driving mode required for ensuring the dynamic response of the vehicle, and illustratively, may be 5 seconds or 10 seconds.

[0070] D. When it is detected that the current accumulated time of entering the dual-motor working mode is less than the set time value, the motor drive system is controlled to enter or maintain the dual-motor working mode.

[0071] Specifically, in this step, if the current mode is dual-motor drive mode, in order to prevent frequent mode switching, when the required power is less than the limit value obtained by looking up the table, but the duration is short, the dual-motor mode is still used.

[0072] E. When it is detected that the current accumulated time is greater than or equal to the set time value, the motor drive system is controlled to switch from the dual-motor working mode to the single-motor working mode.

[0073] Specifically, in this step, if the current mode is dual-motor drive mode, in order to prevent frequent mode switching, the single-motor drive mode can only be entered when the required power is less than the limit value obtained by looking up the table and continues for a set period.

[0074] S209: Determine whether the current recovery power is greater than a set first power limit.

[0075] S210: If the current recovered power is greater than a set first power limit, control the motor drive system to keep the first motor in a working state to operate normally, and start the second motor in a non-working state.

[0076] Specifically, in this step, when a single motor cannot meet the power required for braking energy recovery, the second motor in the off state can be turned on while the first motor is kept on, so that the two motors provide power at the same time.

[0077] S211, determining the reducer gear position that the second motor needs to be engaged in, and controlling the second motor to be in the reducer gear position for power output.

[0078] In this embodiment, the speed reducer gear position can be understood as the gear position corresponding to the fixed power input of the motor control.

[0079] Specifically, in this step, since the required power is greater than the maximum power of the first motor but less than the combined power provided by the first motor and the second motor, a gear can be set on the second motor to limit the power that the second motor can provide according to different gears, thereby avoiding power waste.

[0080] In this embodiment, determining the reducer gear position that the second motor needs to be engaged in can be further specified as follows:

[0081] Determine the power difference between the current required power corresponding to the vehicle in the current driving scenario and the current output power corresponding to the first motor, and use the power difference as the remaining required power of the vehicle.

[0082] In this embodiment, the power difference can be understood as the portion of the required power exceeding the maximum power provided by the single motor. The remaining required power can be understood as the power of the required power that needs to be satisfied by the second motor.

[0083] Specifically, in this step, when the dual-motor mode is turned on, the current required power is subtracted from the maximum power that a single motor can provide to obtain the power that the second motor needs to provide, and the second motor provides power accurately through gear adjustment.

[0084] Determining the reducer gear position that the second motor needs to be engaged in according to the output shaft speed of the vehicle and the remaining required power;

[0085] Among them, the current driving scenario includes a braking energy recovery scenario.

[0086] Specifically, in this step, different gears are set for the motor, and each gear corresponds to a different power provided by the motor. According to the calculated remaining required power and output speed value, a suitable gear is selected in the second motor to provide sufficient power to meet the power response of the vehicle.

[0087] S212: If the current recovered power is less than or equal to the set first power limit, control the motor drive system to maintain the current working mode unchanged.

[0088] The second embodiment of the present invention provides a motor drive control method for an electric vehicle. After the vehicle enters a normal driving condition, a brake signal detection is performed; if a brake signal is detected, the current recovery power of the brake energy recovery is determined; if the current recovery power is greater than the set first power limit, the motor drive system is controlled to enter the dual-motor working mode to perform brake energy recovery in the dual-motor working mode. The single and dual motor working modes are determined from multiple dimensions such as the influence of the brake signal, the influence of the dual motors on the brake energy recovery, and the switching of the single and dual motors caused by the motor power limit, so as to maximize the recovery capacity of the system, improve the system efficiency, avoid power waste, and switch the motor working mode according to the output speed value and the actual power required, so as to avoid the problem of slow system power response caused by the large torque required in the starting stage in the prior art and the immediate conversion to the dual-motor working mode.

[0089] Embodiment 3

[0090] Figure 3 This is a schematic diagram of the structure of a motor drive control device for an electric vehicle provided in Embodiment 3 of the present invention. Figure 3 As shown, the device includes: a detection module 31, a determination module 32 and a recovery module 33.

[0091] The detection module 31 is used to detect the brake signal after the vehicle enters the normal driving condition.

[0092] The determination module 32 is used to determine the current recovery power of the braking energy recovery if it is detected that a braking signal currently exists.

[0093] The recovery module 33 is used to control the motor drive system to enter the dual-motor working mode if the current recovery power is greater than the set first power limit, so as to perform braking energy recovery in the dual-motor working mode.

[0094] The third embodiment of the present invention provides a motor drive control device for an electric vehicle, which performs brake signal detection after the vehicle enters normal driving conditions; if a brake signal is detected, the current recovery power of the brake energy recovery is determined; if the current recovery power is greater than the set first power limit, the motor drive system is controlled to enter the dual-motor working mode to perform brake energy recovery in the dual-motor working mode. The single and dual motor working modes are determined from multiple dimensions such as the influence of the brake signal, the influence of the dual motors on the brake energy recovery, and the switching of the single and dual motors caused by the motor power limit, so as to maximize the recovery capacity of the system, improve the system efficiency, avoid power waste, and switch the motor working mode according to the output speed value and the actual power required, so as to avoid the problem of slow system power response caused by the large torque required in the starting stage in the prior art and the immediate conversion to the dual-motor working mode.

[0095] Furthermore, the motor drive control device of the electric vehicle also includes:

[0096] A maintenance module is used to control the motor drive system to maintain the current working mode unchanged if the current recovery power is less than or equal to the set first power limit value

[0097] The speed comparison module is used to obtain the output shaft speed of the vehicle if it is detected that there is no brake signal at present, and control the working mode of the motor drive system according to the comparison result between the output shaft speed and the set speed threshold.

[0098] Optionally, the speed comparison module includes:

[0099] The comparison unit is used to compare the output shaft speed with a set speed threshold.

[0100] The switching unit is used to control the motor drive system to enter or maintain the dual-motor working mode if the comparison result is that the output shaft speed is less than or equal to the set speed threshold.

[0101] The search unit is used to search the set speed power limit association table to determine the target power limit corresponding to the output shaft speed.

[0102] The control unit is used to control the working mode of the motor drive system according to the comparison result of the current required power of the vehicle and the target power limit.

[0103] Optionally, the control unit can be used to:

[0104] Obtaining a current required power of the vehicle corresponding to a current driving scenario, and comparing the current required power with the target power limit;

[0105] If the current required power is greater than the target power limit, the motor drive system is controlled to enter or maintain a dual-motor operation mode; otherwise,

[0106] When it is detected that the current accumulated time of entering the dual-motor working mode is less than the set time value, the motor drive system is controlled to enter or maintain the dual-motor working mode;

[0107] When it is detected that the current accumulated time is greater than or equal to the set time value, the motor drive system is controlled to switch from the dual-motor working mode to the single-motor working mode.

[0108] Furthermore, the recycling module comprises:

[0109] The starting unit is used to control the motor drive system to keep the first motor in the working state working normally, and start the second motor in the non-working state.

[0110] The gear determination unit is used to determine the reducer gear that the second motor needs to be engaged in, and control the second motor to be in the reducer gear for power output.

[0111] Optionally, the gear determination unit may be used to:

[0112] Determine a power difference between a current required power of the vehicle in a current driving scenario and a current output power of the first motor, and use the power difference as a remaining required power of the vehicle;

[0113] Determining the reducer gear position that the second motor needs to be engaged in according to the output shaft speed of the vehicle and the remaining required power;

[0114] Among them, the current driving scenario includes a braking energy recovery scenario.

[0115] The motor drive control device for an electric vehicle provided in an embodiment of the present invention can execute the motor drive control method for an electric vehicle provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0116] Embodiment 4

[0117] Figure 4 A schematic diagram of the structure of an electric vehicle provided in the fourth embodiment of the present invention is shown in FIG. Figure 4 As shown, the vehicle includes a controller 41, a memory 42, an input device 43 and an output device 44. The number of the controller 41 and the memory 42 can be one or more. Figure 4 A controller 41 and a memory 42 are taken as an example; the controller and the memory in the vehicle can be connected by a bus or other means. Figure 4 In the example of the bus connection, the controller is also associated with a detection module 31, a determination module 32 and a recovery module 33, wherein the detection module 31 is used to detect the brake signal after the vehicle enters the normal driving condition. The determination module 32 is used to determine the current recovery power of the brake energy recovery if a brake signal is detected. The recovery module 33 is used to control the motor drive system to enter the dual-motor working mode if the current recovery power is greater than the set first power limit, so as to recover the brake energy in the dual-motor working mode.

[0118] The memory 42 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal, etc. In addition, the memory 42 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some examples, the memory 42 may further include a memory remotely arranged relative to the controller 41, and these remote memories may be connected to the vehicle via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0119] The input device 43 may be used to receive digital or character information and generate key signal input related to vehicle user settings and function control. The output device 44 may include display devices such as a display screen.

[0120] Embodiment 5

[0121] Embodiment 5 of the present invention further provides a storage medium containing computer executable instructions, wherein the computer executable instructions are used for a motor drive control method for an electric vehicle when executed by a computer controller, the method comprising:

[0122] After the vehicle enters normal driving conditions, brake signal detection is performed;

[0123] If a braking signal is detected, the current recovery power of the braking energy recovery is determined;

[0124] If the current recovery power is greater than the set first power limit, the motor drive system is controlled to enter the dual-motor working mode to perform braking energy recovery in the dual-motor working mode.

[0125] Of course, the storage medium containing computer executable instructions provided in an embodiment of the present invention is not limited to the method operations described above, and can also execute related operations in the motor drive control method for an electric vehicle provided in any embodiment of the present invention.

[0126] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, a read-only memory (ROM), a random access memory (RAM), a flash memory (FLASH), a hard disk or an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0127] It is worth noting that in the embodiment of the motor drive control device of the above-mentioned electric vehicle, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0128] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device, or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0129] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0130] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0131] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0132] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0133] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor drive control method for an electric vehicle, characterized in that: include: After the vehicle enters normal driving conditions, brake signal detection is performed; If a braking signal is detected, the current recovery power of the braking energy recovery is determined; If the current recovery power is greater than a set first power limit, controlling the motor drive system to enter a dual-motor working mode to perform brake energy recovery in the dual-motor working mode; Wherein, the method further comprises: If the current recovered power is less than or equal to the set first power limit, controlling the motor drive system to maintain the current working mode unchanged; Wherein, the method further comprises: If it is detected that there is no brake signal at present, the output shaft speed of the vehicle is obtained, and the working mode of the motor drive system is controlled according to the comparison result between the output shaft speed and the set speed threshold; The operation mode control of the motor drive system according to the comparison result between the output shaft speed and the set speed threshold comprises: Comparing the output shaft speed with a set speed threshold; If the comparison result is that the output shaft speed is less than or equal to the set speed threshold, the motor drive system is controlled to enter or maintain the dual-motor working mode; otherwise, Searching a set speed power limit association table to determine a target power limit corresponding to the output shaft speed; Controlling the working mode of the motor drive system according to a comparison result of the current required power of the vehicle and the target power limit; The control of the working mode of the motor drive system according to the comparison result of the current required power of the vehicle and the target power limit value includes: Obtaining a current required power of the vehicle corresponding to a current driving scenario, and comparing the current required power with the target power limit; If the current required power is greater than the target power limit, the motor drive system is controlled to enter or maintain a dual-motor operation mode; otherwise, When it is detected that the current accumulated time of entering the dual-motor working mode is less than the set time value, the motor drive system is controlled to enter or maintain the dual-motor working mode; When it is detected that the current accumulated time is greater than or equal to the set time value, the motor drive system is controlled to switch from the dual-motor working mode to the single-motor working mode.

2. The method according to claim 1, characterized in that The steps of controlling the motor drive system to enter the dual-motor working mode include: Control the motor drive system to keep the first motor in working state working normally, and start the second motor in non-working state; Determine the reducer gear position that the second motor needs to be engaged in, and control the second motor to be in the reducer gear position for power output.

3. The method according to claim 2, characterized in that The step of determining the reducer gear position that the second motor needs to be engaged in includes: Determine a power difference between a current required power of the vehicle in a current driving scenario and a current output power of the first motor, and use the power difference as a remaining required power of the vehicle; Determining the reducer gear position that the second motor needs to be engaged in according to the output shaft speed of the vehicle and the remaining required power; Among them, the current driving scenario includes a braking energy recovery scenario.

4. A motor drive control device for an electric vehicle, characterized in that: include: A detection module, used to detect brake signals after the vehicle enters normal driving conditions; A determination module, configured to determine a current recovery power of the braking energy recovery if a braking signal is detected; a recovery module, configured to control the motor drive system to enter a dual-motor operation mode if the current recovery power is greater than a set first power limit value, so as to perform brake energy recovery in the dual-motor operation mode; Wherein, the motor drive control device of the electric vehicle further includes: A maintaining module, configured to control the motor drive system to maintain a current working mode unchanged if the current recovered power is less than or equal to a set first power limit; A speed comparison module is used to obtain the output shaft speed of the vehicle if it is detected that there is no brake signal at present, and control the working mode of the motor drive system according to the comparison result between the output shaft speed and the set speed threshold; Wherein, the speed comparison module includes: A comparison unit, used for comparing the output shaft speed with a set speed threshold; A switching unit, used for controlling the motor drive system to enter or maintain a dual-motor working mode if the comparison result shows that the output shaft speed is less than or equal to a set speed threshold; A search unit, used to search a set speed power limit association table to determine a target power limit corresponding to the output shaft speed; A control unit, configured to control the working mode of the motor drive system according to a comparison result between the current required power of the vehicle and the target power limit; Wherein, the control unit is used for: Obtaining a current required power of the vehicle corresponding to a current driving scenario, and comparing the current required power with the target power limit; If the current required power is greater than the target power limit, the motor drive system is controlled to enter or maintain a dual-motor operation mode; otherwise, When it is detected that the current accumulated time of entering the dual-motor working mode is less than the set time value, the motor drive system is controlled to enter or maintain the dual-motor working mode; When it is detected that the current accumulated time is greater than or equal to the set time value, the motor drive system is controlled to switch from the dual-motor working mode to the single-motor working mode.

5. An electric vehicle, characterized in that: include: A dual-motor drive system, the dual-motor drive system comprising dual motors and corresponding multi-speed reducers; one or more controllers; A memory communicatively connected to at least one controller; wherein, The memory stores a computer program executable by the at least one controller, and the computer program is executed by the at least one controller so that the at least one controller can execute the motor drive control method for an electric vehicle according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a controller to implement the motor drive control method for an electric vehicle according to any one of claims 1 to 3 when executed.

7. A computer program product, characterized in that The computer program product comprises a computer program, which, when executed by a controller, implements the motor drive control method for an electric vehicle according to any one of claims 1 to 3.

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