High-speed energy-saving driving system based on motor alternate start-stop and grouping power battery rotation

Abstract

The application relates to the technical field of electric automobile power drive control, and discloses a high-speed energy-saving drive system based on motor alternate starting and stopping and group power battery rotation, which comprises a vehicle controller, two or more drive motors, independent motor controllers, a power coupling disengaging mechanism and group power batteries; when the vehicle enters a high-speed driving working condition, the vehicle controller controls the entry into an alternate driving mode: only one motor works at the same time, and the remaining motors are powered off and mechanically disengaged to eliminate the drag loss; the motors are rotated according to a period, a temperature or an efficiency threshold value; the group power batteries are one-to-one corresponding to the motors and are synchronously rotated to supply power, so that the battery discharge rate is reduced; the system makes the motor keep operating in a high-efficiency interval, reduces the continuous large-current discharge loss and heating, thereby reducing the power consumption of the vehicle in high-speed driving, improving the real high-speed endurance, and automatically switching to multi-motor parallel driving in complex working conditions such as sudden acceleration and climbing, so that the energy saving and power performance are considered.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle power drive control technology, specifically a high-speed energy-saving drive system based on alternating start-stop of the motor and grouped power battery rotation. Background Technology

[0002] With the increasing popularity of pure electric vehicles, the problem of significant range reduction under high-speed conditions has become increasingly prominent. When a vehicle is traveling at high speed, air resistance increases with the square of speed, and the required drive power increases cubically, causing the motor to operate at high speed and low efficiency for extended periods. Simultaneously, the continuous high-load operation of a single motor leads to severe heat generation, significantly increasing the energy consumption of the vehicle's thermal management system; the continuous high-rate discharge of the power battery increases internal resistance losses, causes a rapid drop in terminal voltage, and reduces usable capacity, resulting in rapid battery depletion and falsely advertised range claims at high speeds.

[0003] Existing dual-motor or multi-motor drive systems mostly employ parallel output or a fixed single-motor driving mode, failing to achieve intermittent motor operation and coordinated battery grouping for power supply, thus unable to simultaneously improve motor efficiency and battery discharge characteristics. Therefore, there is an urgent need for a drive control scheme that can improve overall system efficiency and reduce energy consumption during high-speed driving. Summary of the Invention (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this invention provides a high-speed energy-saving drive system based on alternating motor start-stop and grouped power battery rotation. It has the advantages of consistently efficient motor operation, low intermittent battery discharge loss, low thermal management energy consumption, reliable high-speed range, and uncompromising power performance. It solves the problems of high energy consumption, low motor efficiency, and large losses from continuous high-rate battery discharge in existing electric vehicles. (II) Technical Solution

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-speed energy-saving drive system based on alternating start-stop of motors and switching of grouped power batteries, the system including a vehicle controller, a drive motor, a motor controller, a power coupling disengagement mechanism, and grouped power batteries; The vehicle controller is equipped with high-speed driving determination logic and alternating drive control strategy to control the alternating operation of the motor and synchronous power supply of the battery pack. The drive motor operates in rotation according to a cycle, temperature, or efficiency threshold. The motor controller is connected to each drive motor respectively, receives instructions from the vehicle controller, and independently controls the start, stop, speed and torque output of the corresponding motor. The power coupling disengagement mechanism is located between the motor and the transmission system to achieve power engagement between the working motor and the transmission system or complete mechanical disengagement of the non-working motor. The grouped power battery consists of at least two independent battery packs, each of which is electrically connected to the corresponding motor controller to achieve independent power supply and alternating power supply.

[0006] Preferably, the vehicle controller is configured with high-speed driving determination logic. When the vehicle is in a high-speed stable driving condition, the system enters the alternating drive mode. When the vehicle detects a high load signal of rapid acceleration and hill climbing, the system automatically exits the alternating drive mode and switches to the multi-motor parallel drive state.

[0007] Preferably, the grouped power battery includes at least two independent battery packs, each of which is equipped with an independent power supply circuit, a contactor, and a current and voltage sampling unit.

[0008] Preferably, the alternating start-stop triggering condition of the drive motor is one or more combinations of a fixed time period, a motor temperature threshold, or an operating efficiency threshold.

[0009] Preferably, the power coupling disengagement mechanism is a clutch or a one-way clutch, which completely disengages the non-working motor, eliminating idle drag and loss.

[0010] Preferably, the high-speed energy-saving drive system based on alternating motor start-stop and grouped power battery rotation includes the following execution steps when the system is applied: S1. High-speed driving condition determination: Collect vehicle speed, throttle opening and load signals to determine whether the vehicle has entered a high-speed driving condition. S2, Alternating Drive Mode Start-up: When high-speed driving conditions are met, the system automatically starts an alternating working mode in which a single motor is driven and the other motors are mechanically disengaged; S3, Motor and Battery Alternation: The working motor is alternated according to preset trigger conditions, and the power supply status of the corresponding battery pack is switched synchronously. S4, High-load condition switching: Real-time monitoring of driving intentions, automatically switching to multi-motor parallel drive under high-load conditions.

[0011] Preferably, the high-speed driving condition determination step in S1 is as follows: S1.1 The vehicle controller collects vehicle speed signals, throttle opening signals, and vehicle load signals in real time; S1.2 When the vehicle speed is detected to be consistently above the preset threshold of 80km / h, the throttle opening change rate is less than the set value ±5% / s, and there is no high load request such as rapid acceleration or hill climbing, the vehicle is determined to have entered high-speed driving condition.

[0012] Preferably, the alternating drive mode startup step in S2 is as follows: S2.1 When it is determined that the vehicle has entered a high-speed driving condition, the vehicle controller first selects the initial working motor and the corresponding battery pack according to the preset rules. S2.2 The vehicle controller sends a power-off command to the controller of the non-working motor and controls the power coupling disengagement mechanism to completely mechanically disengage the motor from the transmission system; S2.3 Simultaneously, an enable command is sent to the controller of the working motor, and the power supply contactor of its corresponding battery pack is closed to achieve efficient single-motor drive.

[0013] Preferably, the motor and battery switching step in S3 is as follows: S3.1 In alternating drive mode, the vehicle controller monitors the running time of the working motor, the motor winding temperature and the current operating efficiency in real time; S3.2 When the running time reaches the preset cycle of 5-10 minutes, the motor temperature is greater than the set threshold of 85℃, or the current efficiency point is less than the preset lower limit of the high efficiency zone of 85%, the rotation command is triggered. S3.3 The vehicle controller first controls the backup motor and its battery pack to complete pre-charging and synchronization, and then smoothly transfers the driving torque to the backup motor. At the same time, the original working motor is powered off and mechanically disengaged, completing one synchronous rotation of the motor and battery pack, so that the system enters the next alternation cycle.

[0014] Preferably, the high-load condition switching step in S4 is as follows: S4.1 In alternating drive mode, the vehicle controller continuously monitors the throttle opening change rate and the vehicle speed change rate. When the instantaneous change rate of throttle opening is detected to be greater than the preset threshold of 50% / s or the vehicle speed cannot maintain the driving state in a short period of time, it is determined that the vehicle has entered a high-load condition. S4.2 The vehicle controller immediately exits the alternating drive mode, controls the backup motor to start quickly and connects it in parallel with the working motor through the power coupling mechanism, and at the same time closes the power supply circuit of the two sets of batteries, so that the system can seamlessly switch to the dual-motor parallel drive mode.

[0015] Compared with the prior art, the present invention provides a high-speed energy-saving drive system based on alternating start-stop of motors and grouped power battery rotation, which has the following beneficial effects: 1. This invention achieves the beneficial effects of significantly reducing high-speed power consumption and improving the realism of driving range by alternating start and stop of the motor and rotating power supply of grouped batteries under high-speed driving conditions, so that the motor always operates in a high-efficiency range and the battery discharges intermittently to reduce high-rate losses.

[0016] 2. This invention completely mechanically disconnects the non-working motor through a power coupling disengagement mechanism to eliminate drag losses, and reduces continuous heat generation by combining the intermittent operation of the motor and battery, ultimately achieving the beneficial effects of reducing the energy consumption of the thermal management system and extending the service life of the motor and battery.

[0017] 3. This invention monitors driving intentions in real time through the vehicle controller and automatically switches to multi-motor parallel drive under heavy load conditions such as rapid acceleration and hill climbing, achieving the beneficial effect of balancing driving energy saving and rapid acceleration power without sacrificing power performance. Attached Figure Description

[0018] Figure 1 This is a block diagram of the overall system structure of the present invention; Figure 2 This is a flowchart of the high-speed alternating drive control of the present invention; Figure 3 This is a schematic diagram of the alternating drive timing of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-3 A high-speed energy-saving drive system based on alternating start-stop of motors and rotation of grouped power batteries. The system includes a vehicle controller, two or more drive motors, an independent motor controller, a power coupling disengagement mechanism, and grouped power batteries. The vehicle controller is equipped with high-speed driving determination logic and alternating drive control strategy to control the alternating operation of the motor and synchronous power supply of the battery pack; The drive motor operates in rotation according to a cycle, temperature, or efficiency threshold. Each motor controller is connected to a corresponding drive motor, receives instructions from the vehicle controller, and independently controls the start / stop, speed, and torque output of the corresponding motor. The power coupling disengagement mechanism is located between the motor and the transmission system to achieve power engagement between the working motor and the transmission system or complete mechanical disengagement of the non-working motor. The grouped power battery consists of at least two independent battery packs, each of which is electrically connected to the corresponding motor controller to achieve independent power supply and alternating power supply.

[0021] When the vehicle enters high-speed driving conditions, the aforementioned vehicle controller switches to an alternating drive mode: only one motor works at a time, while the other motors are de-energized and mechanically disengaged to eliminate drag losses; the motors take turns operating according to cycles, temperature, or efficiency thresholds; the grouped power batteries correspond one-to-one with the motors and synchronously take turns supplying power, thereby reducing the battery discharge rate. The system enables the motors to operate in a high-efficiency range, reducing continuous high-current discharge losses and heat generation, thereby reducing the vehicle's power consumption at high speeds and improving the realism of high-speed range. At the same time, under complex conditions such as rapid acceleration and hill climbing, it can automatically switch to multi-motor parallel drive, taking into account both energy saving and power performance.

[0022] The vehicle controller is equipped with high-speed driving judgment logic. When the vehicle is in a high-speed stable driving condition, the system enters the alternating drive mode. At any given time, only one motor is in the driving state, while the other motors are de-energized and mechanically disengaged through the power coupling disengagement mechanism. The grouped power batteries correspond one-to-one with the drive motors to achieve synchronous rotational power supply. When the vehicle detects a high load signal during rapid acceleration or hill climbing, the vehicle controller automatically exits the alternating drive mode and switches to a multi-motor parallel drive state.

[0023] The vehicle controller uses a built-in operating condition recognition module to monitor the rate of change of throttle opening and vehicle speed in real time. When a rapid acceleration or hill climbing condition is detected, a mode switching command is immediately triggered.

[0024] The grouped power battery includes at least two independent battery packs, each of which is equipped with an independent power supply circuit, contactor, and current and voltage sampling unit.

[0025] Independent power supply circuits and contactor switching control enable independent power supply and rotational power supply for each battery pack; current and voltage sampling units monitor battery status in real time, providing battery state of charge (SOC) and state of health (SOH) data to the vehicle controller.

[0026] The alternating start-stop triggering condition for the drive motor is one or more combinations of a fixed time period, a motor temperature threshold, or an operating efficiency threshold.

[0027] The vehicle controller tracks motor running time, samples motor winding temperature, and monitors current motor efficiency. The calculation is performed using the following formula: In the formula, Ƞ represents the current operating efficiency of the motor. This indicates the mechanical power output of the motor. This represents the electrical power input to the motor; it is used to calculate the current operating efficiency of the motor. When any of the following trigger conditions are met, the motor switching operation will be automatically executed: the motor speed is below the preset high-efficiency zone lower limit threshold of 85%, the motor running time reaches the preset cycle of 5-10 minutes, or the motor winding temperature exceeds the set threshold of 85℃.

[0028] The power coupling disengagement mechanism uses a clutch or a one-way clutch to completely disengage the non-working motor, eliminating idle drag and loss.

[0029] The power coupling disengagement mechanism performs a mechanical separation action after the non-working motor is powered off, completely decoupling the motor rotor from the transmission system and eliminating the drag torque and energy loss generated by the motor idling.

[0030] The high-speed energy-saving drive system based on alternating motor start-stop and grouped power battery rotation includes the following execution steps when the system is applied: S1. High-speed driving condition determination: Collect vehicle speed, throttle opening and load signals to determine whether the vehicle has entered a high-speed driving condition. S2, Alternating Drive Mode Start-up: When high-speed driving conditions are met, the system automatically starts an alternating working mode in which a single motor is driven and the other motors are mechanically disengaged; S3, Motor and Battery Alternation: The working motor is alternated according to preset trigger conditions, and the power supply status of the corresponding battery pack is switched synchronously. S4, High-load condition switching: Real-time monitoring of driving intentions, automatically switching to multi-motor parallel drive under high-load conditions.

[0031] Specifically, the steps for determining high-speed driving conditions in S1 are as follows: S1.1 The vehicle control unit (VCU) collects vehicle speed signals, throttle opening signals, and vehicle load signals in real time. S1.2 When the vehicle speed is detected to be consistently above the preset threshold of 80km / h, the throttle opening change rate is less than the set value ±5% / s, and there is no high load request such as rapid acceleration or hill climbing, the vehicle is determined to have entered high-speed driving condition.

[0032] By continuously monitoring and logically judging vehicle speed, throttle opening and load signals through the vehicle controller, accurate identification of high-speed driving conditions can be achieved.

[0033] Specifically, the startup steps for the alternating drive mode in S2 are as follows: S2.1 When it is determined that the vehicle has entered a high-speed driving condition, the vehicle control unit (VCU) first selects the initial working motor and the corresponding battery pack according to preset rules (such as the cumulative running time of the motor or the state of charge of the battery pack). S2.2 The vehicle control unit (VCU) sends a power-off command to the controller of the non-working motor and controls the power coupling disengagement mechanism to completely mechanically disengage the motor from the transmission system; S2.3 Simultaneously, an enable command is sent to the controller of the working motor, and the power supply contactor of its corresponding battery pack is closed to achieve efficient single-motor drive.

[0034] Specifically, in S2.1: S2.1.1 Status Acquisition: The VCU reads the cumulative running time of each drive motor, the state of charge (SOC) and state of health (SOH) data of each battery pack; S2.1.2 Balance judgment: The VCU compares the collected data and prioritizes the motor with the shortest cumulative running time as the initial working motor to balance the mechanical wear and aging of each motor; if the difference in cumulative running time of each motor is less than 5% of the preset threshold, the state of charge of the corresponding battery pack is further compared, and the motor corresponding to the battery pack with the highest state of charge is prioritized as the initial working motor to balance the discharge depth of each battery pack. S2.1.3 Initial Pairing Confirmation: Based on the selection result, the Vehicle Control Unit (VCU) confirms the initial working motor and its paired battery pack (e.g., motor A corresponds to battery pack A), and marks the non-working motor and its corresponding battery pack as spare units.

[0035] The VCU reads the motor's operating history and battery status data, and executes balance judgment logic to achieve optimized pairing of the initial working motor and battery pack, ensuring balanced lifespan of each unit in the system.

[0036] Specifically, the motor and battery switching steps in S3 are as follows: S3.1 In alternating drive mode, the vehicle control unit (VCU) monitors the running time of the working motor, the motor winding temperature and the current operating efficiency in real time. S3.2 When the running time reaches the preset cycle of 5-10 minutes, the motor temperature is greater than the set threshold of 85℃, or the current efficiency point is less than the preset lower limit of the high efficiency zone of 85%, the rotation command is triggered. S3.3 The vehicle control unit (VCU) first controls the backup motor and its battery pack to complete pre-charging and synchronization, and then smoothly transfers the driving torque to the backup motor. At the same time, it disconnects the power to the original working motor and mechanically disengages it, completing one synchronous rotation of the motor and battery pack, so that the system enters the next alternation cycle.

[0037] By monitoring the motor's operating parameters in real time through the VCU and comparing them with preset thresholds, when the switching conditions are triggered, the backup unit is controlled to complete pre-charging and speed synchronization, and then the torque is transferred and mechanically disengaged, thus achieving seamless switching between the motor and the battery pack.

[0038] Specifically, the switching steps for high-load conditions in S4 are as follows: S4.1 In alternating drive mode, the vehicle control unit (VCU) continuously monitors the rate of change of throttle opening and the rate of change of vehicle speed. When the instantaneous rate of change of throttle opening is detected to be greater than the preset threshold of 50% / s or the vehicle speed cannot maintain the driving state in a short period of time (such as encountering a hill and causing the vehicle speed to drop by more than 5km / h), it is determined that the vehicle has entered a high-load condition. S4.2 The vehicle control unit (VCU) immediately exits the alternating drive mode, controls the backup motor to start quickly and connects it in parallel with the working motor through the power coupling mechanism, and at the same time closes the power supply circuit of the two sets of batteries, so that the system seamlessly switches to the dual-motor parallel drive mode to ensure that the vehicle obtains sufficient acceleration or climbing power.

[0039] By monitoring the throttle opening change rate and vehicle speed maintenance capability in real time through the VCU, the vehicle quickly exits the alternating mode and starts the backup motor and battery pack after identifying the heavy load condition, so as to realize the parallel drive of the two motors to ensure power output. Example 1

[0040] like Figure 1 As shown, the system includes: vehicle controller (VCU), motor A, motor B, motor controllers MCU-A and MCU-B, power coupling disengagement mechanism, reducer, wheels, battery pack A, battery pack B, and independent power supply contactor.

[0041] The vehicle controller is connected to two motor controllers to achieve independent control; the power coupling disconnection mechanism is used to completely disconnect the non-working motor to avoid dragging losses; battery packs A and B provide independent power to motors A and B respectively, and can be controlled by the VCU to switch on and off. Example 2

[0042] like Figure 2 As shown, the control flow is as follows: (1) The vehicle is powered on and enters normal driving mode; (2) The VCU monitors vehicle speed, throttle, and load in real time; (3) When the vehicle speed is ≥80km / h, the throttle is stable, and there is no heavy load, the high-speed alternating drive mode is entered; (4) Start motor A to work, motor B disconnects, and battery pack A supplies power; (5) When the set cycle or motor temperature threshold is reached, smoothly switch to motor B working, motor A disconnected, and battery pack B supplying power; (6) Cyclic alternation; (7) When rapid acceleration or hill climbing is detected, switch to dual-motor parallel drive. Example 3

[0043] like Figure 3 As shown, the sequential logic is: T0-T1: Motor A and battery pack A are working; Time T1: Execute rotation; T1-T2: Motor B and battery pack B are working; Time T2: Enter the next cycle.

[0044] The switching process is smooth with no noticeable jerking.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications or equivalent substitutions made within the principles of the present invention should be included within the scope of protection of the present invention.

[0046] In summary, this invention, through the coordinated control of alternating start-stop of multiple motors and the rotation of grouped power batteries, ensures that the motors always operate in the high-efficiency range under high-speed driving conditions. The intermittent discharge of the battery pack reduces high-rate losses, and the power coupling disengagement mechanism eliminates drag losses from non-working motors. This results in a significant reduction in overall vehicle energy consumption and a substantial increase in driving range under high-speed conditions. Under high-load conditions such as rapid acceleration and hill climbing, the system automatically switches to a multi-motor parallel drive mode to ensure that power performance is not affected. This invention has a clear system architecture and sound control logic, can be implemented on existing multi-motor platforms, and has promising prospects for industrial application.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-speed energy-saving drive system based on alternating motor start-stop and grouped power battery rotation, characterized in that, The system includes a vehicle controller, a drive motor, a motor controller, a power coupling disengagement mechanism, and grouped power batteries; The vehicle controller is equipped with high-speed driving determination logic and alternating drive control strategy to control the alternating operation of the motor and synchronous power supply of the battery pack. The drive motor operates in rotation according to a cycle, temperature, or efficiency threshold. The motor controller is connected to each drive motor respectively, receives instructions from the vehicle controller, and independently controls the start, stop, speed and torque output of the corresponding motor. The power coupling disengagement mechanism is located between the motor and the transmission system to achieve power engagement between the working motor and the transmission system or complete mechanical disengagement of the non-working motor. The grouped power battery consists of at least two independent battery packs, each of which is electrically connected to the corresponding motor controller to achieve independent power supply and alternating power supply.

2. The high-speed energy-saving drive system based on alternating motor start-stop and grouped power battery rotation according to claim 1, characterized in that, The vehicle controller is configured with high-speed driving determination logic. When the vehicle is in a high-speed stable driving condition, the system enters the alternating drive mode. When the vehicle detects a high load signal of rapid acceleration and hill climbing, the system automatically exits the alternating drive mode and switches to the multi-motor parallel drive state.

3. The high-speed energy-saving drive system based on alternating motor start-stop and grouped power battery rotation according to claim 1, characterized in that, The grouped power battery includes at least two independent battery packs, each of which is equipped with an independent power supply circuit, contactor, and current and voltage sampling unit.

4. The high-speed energy-saving drive system based on alternating motor start-stop and grouped power battery rotation according to claim 1, characterized in that, The alternating start-stop triggering condition of the drive motor is one or more combinations of a fixed time period, a motor temperature threshold, or an operating efficiency threshold.

5. The high-speed energy-saving drive system based on alternating motor start-stop and grouped power battery rotation according to claim 1, characterized in that, The power coupling disengagement mechanism uses a clutch or a one-way clutch to completely disengage the non-working motor, eliminating idle drag and loss.

6. The high-speed energy-saving drive system based on alternating motor start-stop and grouped power battery rotation according to claim 1, characterized in that, When the system is used, the following execution steps are included: S1. High-speed driving condition determination: Collect vehicle speed, throttle opening and load signals to determine whether the vehicle has entered a high-speed driving condition. S2, Alternating Drive Mode Start-up: When high-speed driving conditions are met, the system automatically starts an alternating working mode in which a single motor is driven and the other motors are mechanically disengaged; S3, Motor and Battery Alternation: The working motor is alternated according to preset trigger conditions, and the power supply status of the corresponding battery pack is switched synchronously. S4, High-load condition switching: Real-time monitoring of driving intentions, automatically switching to multi-motor parallel drive under high-load conditions.

7. The high-speed energy-saving drive system based on alternating motor start-stop and grouped power battery rotation according to claim 6, characterized in that, The high-speed driving condition determination steps in S1 are as follows: S1.1 The vehicle controller collects vehicle speed signals, throttle opening signals, and vehicle load signals in real time; S1.2 When the vehicle speed is detected to be consistently above the preset threshold of 80km / h, the throttle opening change rate is less than the set value ±5% / s, and there is no high load request such as rapid acceleration or hill climbing, the vehicle is determined to have entered high-speed driving condition.

8. The high-speed energy-saving drive system based on alternating motor start-stop and grouped power battery rotation according to claim 6, characterized in that, The alternating drive mode startup steps in S2 are as follows: S2.1 When it is determined that the vehicle has entered a high-speed driving condition, the vehicle controller first selects the initial working motor and the corresponding battery pack according to the preset rules. S2.2 The vehicle controller sends a power-off command to the controller of the non-working motor and controls the power coupling disengagement mechanism to completely mechanically disengage the motor from the transmission system; S2.3 Simultaneously, an enable command is sent to the controller of the working motor, and the power supply contactor of its corresponding battery pack is closed to achieve efficient single-motor drive.

9. The high-speed energy-saving drive system based on alternating motor start-stop and grouped power battery rotation according to claim 6, characterized in that, The motor and battery switching steps in S3 are as follows: S3.1 In alternating drive mode, the vehicle controller monitors the running time of the working motor, the motor winding temperature and the current operating efficiency in real time; S3.2 When the running time reaches the preset cycle of 5-10 minutes, the motor temperature is greater than the set threshold of 85℃, or the current efficiency point is less than the preset lower limit of the high efficiency zone of 85%, the rotation command is triggered. S3.3 The vehicle controller first controls the backup motor and its battery pack to complete pre-charging and synchronization, and then smoothly transfers the driving torque to the backup motor. At the same time, the original working motor is powered off and mechanically disengaged, completing one synchronous rotation of the motor and battery pack, so that the system enters the next alternation cycle.

10. The high-speed energy-saving drive system based on alternating motor start-stop and grouped power battery rotation according to claim 6, characterized in that, The high-load condition switching steps in S4 are as follows: S4.1 In alternating drive mode, the vehicle controller continuously monitors the throttle opening change rate and the vehicle speed change rate. When the instantaneous change rate of throttle opening is detected to be greater than the preset threshold of 50% / s or the vehicle speed cannot maintain the driving state in a short period of time, it is determined that the vehicle has entered a high-load condition. S4.2 The vehicle controller immediately exits the alternating drive mode, controls the backup motor to start quickly and connects it in parallel with the working motor through the power coupling mechanism, and at the same time closes the power supply circuit of the two sets of batteries, so that the system can seamlessly switch to the dual-motor parallel drive mode.

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