A range extended electric vehicle energy management control method, system, device and medium

Abstract

This application discloses an energy management control method, system, device, and medium for range-extended electric vehicles, belonging to the field of electric vehicle technology. The method includes: a hierarchical collaborative control strategy that, in energy recovery mode, prioritizes the consumption of additional power, then reduces the power generation of the range extender, and finally adjusts the recovery torque. This effectively avoids the risk of battery overcharging when charging is limited at low temperatures. At the same time, it ensures that the range extender is always in a state of continuous fuel supply, completely eliminating the problem of gear knocking noise caused by the torque reversal of the generator due to fuel cut-off. This significantly improves the smoothness of the vehicle's driving and the lifespan of the range extender gears, achieving a comprehensive balance between driving safety, ride comfort, and hardware reliability.

Description

Technical Field

[0001] This application belongs to the field of electric vehicle technology, and specifically relates to a method, system, device and medium for energy management and control of range-extended electric vehicles. Background Technology

[0002] In low-temperature environments, the battery charging power of range-extended electric vehicles is limited. When the driver releases the accelerator pedal or applies the brake, the vehicle enters energy recovery mode. At this time, the sum of the energy recovery power generated by the drive motor and the power generated by the range extender often exceeds the maximum charging power that the battery can allow. If this is not limited, it will lead to battery overcharging and cause driving safety issues. Current technologies often use range extenders to directly cut off fuel to reduce the total charging power to the battery. However, after the range extender cuts off fuel, the engine has no power. The range extender's generator needs to switch from generator mode to drive mode to maintain engine speed and avoid frequent engine shutdowns. When the generator switches from generator mode to drive mode, the generator's torque will reverse. The generator is usually matched with a gear transmission mechanism. When the torque reverses, the gear meshing surface will also reverse. During this process, unexpected gear knocking noises are very likely to be generated, affecting the driving experience and gear life. Summary of the Invention

[0003] To address the aforementioned issues, this application provides an energy management control method, system, device, and medium for range-extended electric vehicles. This method solves the problem of gear knocking noise caused by frequent fuel cut-offs in the range extender engine due to the low battery charging capacity in low-temperature environments, which affects the user's driving experience and the lifespan of the range extender gears. It can avoid fuel cut-off conditions in the range extender engine and resolve issues such as gear knocking noise.

[0004] In a first aspect, this application provides an energy management control method for a range-extended electric vehicle, the method comprising, After confirming that the vehicle has entered energy recovery mode, the energy recovery power of the drive motor, the power generation power of the range extender, and the battery's allowable charging power threshold are collected. Based on the result of judging the sum of the recovered power and the generated power and the charging power threshold, it is determined whether to maintain the current mode or control the high-voltage load of the vehicle to start at the target power. Based on the judgment result of the sum of the recovered power and the generated power and the sum of the charging power threshold and the target power, it is determined whether to maintain the current mode or control the range extender to enter the idle generation mode. Based on the judgment result of the sum of the recovered power and generated power in the idle power generation mode and the sum of the charging power threshold and the target power, it is determined whether to maintain the current mode or adjust the energy recovery power of the drive motor until the sum of the recovered power and the generated power threshold is less than or equal to the sum of the charging power threshold and the target power.

[0005] Furthermore, The determination that the vehicle has entered energy recovery mode specifically includes: Real-time monitoring of the vehicle's operating status; When the target object releases the accelerator pedal or presses the brake pedal, the vehicle is determined to enter the energy recovery mode.

[0006] Furthermore, The step of determining whether to maintain the current mode or control the vehicle's high-voltage load to start at the target power based on the result of judging the sum of the recovered power and the generated power and the charging power threshold specifically includes: Determine whether the sum of the recovered power and the generated power is greater than the charging power threshold; If not, maintain the current mode; If so, then control the high-voltage load of the entire vehicle to start at the target power.

[0007] Furthermore, The step of determining whether to maintain the current mode or control the range extender to enter idle power generation mode based on the judgment result of the sum of the recovered power and the generated power and the sum of the charging power threshold and the target power specifically includes: Determine whether the sum of the recovered power and the generated power is greater than the sum of the charging power threshold and the target power; If not, maintain the current mode; If so, control the range extender to enter idle power generation mode; In the idle power generation mode, the range extender engine is controlled to maintain fuel supply and not stop, and the power generation of the range extender is controlled to be reduced to a preset idle power generation value, which is less than the power generation of the range extender in the normal power generation mode.

[0008] Furthermore, The process of determining the preset idle power generation value specifically includes: Obtain the critical speed that the range extender engine can operate without stopping and without producing abnormal knocking noise during gear reversal; The critical power output of the range extender generator is determined based on the critical speed, and the critical power output is set to the preset idle power output value.

[0009] Furthermore, The step of determining whether to maintain the current mode or adjust the energy recovery power of the drive motor based on the judgment result of the sum of the recovered power and the generated power in the idle power generation mode and the sum of the charging power threshold and the target power specifically includes: When the range extender enters the idle power generation mode, the sum of the current drive motor energy recovery power and the range extender idle power generation power is calculated in real time. If the total power is still greater than the sum of the charging power threshold and the target power, it is determined that the energy recovery power of the drive motor needs to be adjusted. If the total power is less than or equal to the sum of the charging power threshold and the target power, the current vehicle energy recovery mode and range extender idle power generation mode are maintained.

[0010] Furthermore, The adjustment of the energy recovery power of the drive motor until the sum of the recovered power and the generated power is less than or equal to the sum of the charging power threshold and the target power specifically includes: According to the torque reduction command, the energy recovery torque of the drive motor is adjusted to simultaneously reduce the energy recovery power of the drive motor until the sum of the energy recovery power of the drive motor and the power generated by the range extender is less than or equal to the sum of the battery's allowable charging power threshold and the target power of the vehicle's high-voltage load.

[0011] Furthermore, The adjustment of the energy recovery torque of the drive motor specifically includes: Within a preset adjustment cycle, the energy recovery torque of the drive motor is gradually reduced in steps according to a fixed torque step size until the sum of the recovered power and the generated power is less than or equal to the sum of the charging power threshold and the target power.

[0012] Secondly, based on the same inventive concept, this application provides an energy management and control system for a range-extended electric vehicle. The system includes: The vehicle control module is used to determine when the vehicle enters energy recovery mode and to collect the energy recovery power of the drive motor, the power generation power of the range extender, and the battery's allowable charging power threshold. Other high-voltage load modules of the vehicle are communicatively connected to the vehicle control module and are used to receive control commands from the vehicle control module. The vehicle control module determines whether to maintain the current mode or send a start command to the other high-voltage load modules of the vehicle based on the judgment result of the sum of the recovered power and the generated power and the charging power threshold, and controls the other high-voltage load modules of the vehicle to start at the target power. The range extender control module is communicatively connected to the vehicle control module and is used to receive control commands from the vehicle control module. The vehicle control module determines whether to maintain the current mode or send an idle command to the range extender control module based on the judgment result of the sum of the recovered power and the generated power and the sum of the charging power threshold and the target power, thereby controlling the range extender to enter the idle power generation mode. The drive motor control module is communicatively connected to the vehicle control module and is used to receive control commands from the vehicle control module. Based on the judgment result of the sum of the recovered power and generated power in the idle power generation mode and the sum of the charging power threshold and the target power, the vehicle control module determines whether to maintain the current mode or send an adjustment command to the drive motor control module to adjust the energy recovery power of the drive motor until the sum of the recovered power and generated power is less than or equal to the sum of the charging power threshold and the target power.

[0013] Thirdly, this application also provides an electronic device, including at least one processor and at least one memory electrically connected; The memory is electrically connected to the processor, wherein the memory stores instructions that can be executed by at least one of the processors, the instructions being executed by at least one of the processors to enable at least one of the processors to perform any of the range-extended electric vehicle energy management control methods described above.

[0014] Fourthly, this application also provides a computer storage medium, wherein a computer program is stored within the computer-readable storage medium; When the computer program is executed by the processor, it implements any of the energy management control methods for range-extended electric vehicles as described above.

[0015] Fifthly, this application also provides a computer program product, which is stored in at least one storage medium; The computer program product includes several instructions for causing at least one electronic device to execute any of the range-extended electric vehicle energy management control methods described above.

[0016] Compared with the prior art, this application has the following advantages: 1. By judging the relationship between the sum of the recovered power and the generated power and the battery's allowable charging power threshold step by step after the vehicle enters the energy recovery mode, and taking coordinated control strategies such as activating high-voltage load consumption, derated range extender and reducing recovered power when the limit is exceeded, the problem of power excess caused by the limited battery charging capacity in low temperature environment is effectively solved, fundamentally avoiding the occurrence of battery overcharge failure and ensuring the driving safety of the whole vehicle. 2. When it is necessary to reduce the power output of the range extender, the range extender is controlled to enter the idle speed generation mode without stopping or interrupting the oil supply, which maintains the consistency of the generator torque direction and completely eliminates the knocking noise problem caused by the reversal of the gear meshing surface. 3. By obtaining the critical speed that the range extender engine can operate without stopping and without producing gear knocking noise, and determining the critical power generation as the preset idle power generation value, the range extender can meet the requirement of reducing the total charging power while avoiding the risk of gear knocking from the physical boundary during derating operation, which significantly improves the service life and reliability of the range extender generator gears. 4. When it is necessary to adjust the energy recovery power of the drive motor, the energy recovery torque is reduced in a stepwise manner according to a fixed torque step size within a preset adjustment cycle, which avoids the sudden change in the driving torque of the drive motor, making the transition of the vehicle deceleration smooth, eliminating the dragging and abrupt feeling when energy recovery intervention, and greatly improving the driver's ride comfort and driving experience.

[0017] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0018] 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.

[0019] Figure 1 A flowchart illustrating the energy management control method for a range-extended electric vehicle according to an embodiment of this application is shown. Figure 2 A structural block diagram of the energy management control system for a range-extended electric vehicle according to an embodiment of this application is shown; Figure 3 A diagram illustrating the energy management control strategy of a range-extended electric vehicle according to an embodiment of this application is shown. Detailed Implementation

[0020] 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.

[0021] Figure 1 An energy management control method for a range-extended electric vehicle according to an embodiment of this application is illustrated. For example... Figure 1 As shown in the figure, the energy management control method for a range-extended electric vehicle according to an embodiment of this application includes the following steps: S1, after determining that the vehicle has entered the energy recovery mode, collect the energy recovery power of the drive motor, the power generation power of the range extender, and the battery's allowable charging power threshold. S2, based on the judgment result of the sum of the recovered power and the generated power and the charging power threshold, determine whether to maintain the current mode or control the high-voltage load of the vehicle to start at the target power; S3, based on the judgment result of the sum of the recovered power and the generated power and the sum of the charging power threshold and the target power, determine whether to maintain the current mode or control the range extender to enter the idle power generation mode; S4, based on the judgment result of the sum of the recovered power and the generated power in the idle power generation mode and the sum of the charging power threshold and the target power, determine whether to maintain the current mode or adjust the energy recovery power of the drive motor until the sum of the recovered power and the generated power threshold is less than or equal to the sum of the charging power threshold and the target power.

[0022] In the specific implementation process, the above strategies not only solve the problem of overcharging the battery under low temperature conditions, but also ensure that the range extender engine does not experience fuel cut-off under any operating conditions, solve the knocking noise problem caused by the reversal of gears due to fuel cut-off torque, improve the overall driving experience of the vehicle, and enhance the reliability of the range extender generator gears.

[0023] In the embodiments of this application, step S1 specifically includes: S11, real-time monitoring of the vehicle's operating status; S12, when the target object is detected to release the accelerator pedal or press the brake pedal, it is determined that the vehicle has entered the energy recovery mode.

[0024] In the embodiments of this application, step S2 specifically includes: S21, determine whether the sum of the recovered power and the generated power is greater than the charging power threshold; S22, if not, maintain the current mode; S23, if so, then control the high-voltage load of the whole vehicle to start at the target power.

[0025] In the specific implementation process, the vehicle's current speed signal, gear signal, accelerator pedal opening signal, brake pedal opening signal, and the current battery temperature value and battery allowable charging power threshold are acquired in real time through the vehicle network. Based on the battery temperature value being lower than the preset temperature threshold, it is determined that the vehicle is currently in a low-temperature restricted operating condition, and the displacement or pressure changes of the accelerator pedal and brake pedal are continuously monitored. It can determine in real time whether the accelerator pedal opening signal has dropped to zero or whether the brake pedal opening signal is greater than zero. When the accelerator pedal opening signal drops to zero and the brake pedal is not pressed, it is determined that the driver intends to coast to decelerate, and the vehicle enters the coasting energy recovery mode. When the brake pedal opening signal is detected to be greater than zero, it is determined that the driver intends to brake and decelerate, and the vehicle enters the brake energy recovery mode. After determining that the energy recovery mode has been entered, the current energy recovery power generated by the drive motor and the current power generation power of the range extender are obtained; The collected energy recovery power of the drive motor and the power generated by the range extender are summed to calculate the total current input power of the vehicle. The difference between the current total input power of the vehicle and the battery's allowable charging power threshold is compared. If the current total input power of the vehicle is less than or equal to the battery's allowable charging power threshold, then the total input power is determined not to exceed the battery's current charging capacity; if the current total input power of the vehicle is greater than the battery's allowable charging power threshold, then the total input power is determined to exceed the battery's current charging capacity, and there is a risk of battery overcharging.

[0026] When the total input power of the vehicle is determined to be less than or equal to the battery's allowable charging power threshold, no additional start command is sent to other high-voltage loads of the vehicle, no idle command is sent, and no torque reduction command is sent. The current power generation continues to operate, and the current energy recovery torque continues to perform the energy recovery function. All the electrical energy generated by the vehicle is absorbed by the battery, and the current energy flow state remains unchanged.

[0027] When it is determined that the total current input electric power of the vehicle is greater than the battery's allowable charging power threshold, the additional electric power value exceeding the battery's allowable charging power threshold is calculated. Send a start command to other high-voltage loads of the vehicle to control at least one of the vehicle heater, air conditioning compressor or power distribution heater among the other high-voltage loads of the vehicle to be powered on; The target power is the rated power consumed after the other high-voltage loads of the vehicle are controlled to start. By controlling the other high-voltage loads of the vehicle to work at their rated power, the high-voltage loads consume the extra power value exceeding the battery's allowable charging power threshold, so as to avoid battery overcharging failure and prevent the range extender from directly performing fuel cut-off operation due to excess power.

[0028] In this embodiment, by dynamically comparing the sum of the energy recovery power of the drive motor and the power generated by the range extender with the battery's allowable charging power threshold, when the total input power exceeds the battery's charging capacity, high-voltage loads such as the on-board heater are prioritized to start at the target power to consume the extra electrical energy. This effectively avoids the risk of battery overcharging under low-temperature limited conditions and eliminates the problem of gear torque reversal knocking noise caused by the range extender directly cutting off fuel due to excess power, significantly improving gear reliability. At the same time, in mitigating the risks of overcharging and fuel cut-off, this strategy can accurately identify the driver's intention to coast or brake and maintain the execution of energy recovery torque, ensuring a linear and consistent deceleration effect. It also effectively converts excess electrical energy into effective work for the high-voltage load, avoiding energy waste and comprehensively improving the overall driving experience and energy utilization rate of the vehicle.

[0029] In the embodiments of this application, step S3 specifically includes: S31, determine whether the sum of the recovered power and the generated power is greater than the sum of the charging power threshold and the target power; S32, if not, maintain the current mode; S33, if yes, then control the range extender to enter idle power generation mode; S34, in the idle power generation mode, the range extender engine is controlled to maintain fuel supply and not stop, and the power generation power of the range extender is controlled to be reduced to a preset idle power generation value, which is less than the power generation power of the range extender in normal power generation mode.

[0030] In the specific implementation process, after the high-voltage load of the vehicle has been started and put into operation at the target power, the sum of the energy recovery power generated by the current drive motor and the power output by the range extender is calculated in real time to obtain the current total input power of the vehicle; at the same time, the current allowable charging power threshold of the battery is summed with the target power currently consumed by the high-voltage load of the vehicle to obtain the current total allowable power consumption threshold of the vehicle; the total input power is compared with the total allowable power consumption threshold to determine whether the total input power still exceeds the power consumption capacity of the vehicle. When the total input power is determined to be less than or equal to the total allowable power consumption threshold, it means that after the high-voltage load of the vehicle starts consuming power at the target power, the total input power of the vehicle can be completely absorbed by the battery charging demand and the high-voltage load consumption, and there is no longer a risk of battery overcharging. At this time, there is no need to change the working state of the range extender. The range extender continues to operate at the current power generation capacity, and the drive motor also continues to perform the recovery function at the current energy recovery power, keeping the current energy flow balance of the vehicle unchanged. When the total input power is determined to be greater than the total allowable power consumption threshold, it indicates that even if the high-voltage load of the vehicle is working at full load according to the target power, the sum of the power recovered by the drive motor and the power generated by the range extender still exceeds the safe charging capacity of the battery. At this time, in order to avoid overcharging of the battery and to avoid gear knocking noise caused by torque reversal due to direct oil cut-off operation of the range extender, a mode switching command is sent to the range extender to control the range extender to switch from normal power generation mode to idle power generation mode.

[0031] In the idle power generation mode, the range extender engine is controlled to maintain fuel supply and not stop, and the power generation of the range extender is controlled to be reduced to a preset idle power generation value, which is less than the power generation of the range extender in the normal power generation mode. In idle power generation mode, the fuel injection system of the range extender engine is continuously controlled to maintain fuel injection and ignition, ensuring continuous combustion and power output of mechanical torque in the engine cylinders, thus preventing the engine from shutting down due to loss of power caused by fuel cut-off. At the same time, the range extender generator is controlled to reduce the electromagnetic torque demand, causing the engine speed to drop to a lower speed range that can be maintained. At this time, the range extender generator only outputs a very low power output, i.e., the preset idle power output value. Since the range extender engine always maintains fuel supply and power output, the range extender generator maintains its power generation state, and the direction of the generator output torque remains unchanged. This avoids the situation where the generator switches from power generation mode to drive mode to drive the engine, thereby completely eliminating the problems of gear meshing surface switching and knocking noise caused by torque reversal in the generator gear transmission mechanism.

[0032] In the embodiments of this application, step S34 specifically includes: S341, obtain the critical speed that the range extender engine can be kept running and without producing abnormal gear reversal knocking noise; S342, determine the critical power output of the range extender generator based on the critical speed, and set the critical power output to the preset idle power output value.

[0033] In the specific implementation process, since the range extender generator is matched with a gear transmission mechanism, when the generator output torque is too low or the speed fluctuation is too large, the squeezing force between the gear meshing surfaces is insufficient, which can easily cause gear knocking under the action of operating inertia. Through bench calibration test, under the condition that the range extender engine keeps the fuel supply and power is continuous, the engine speed is gradually reduced, and the vibration data and noise data of the generator gear transmission mechanism are monitored in real time to find the lower limit of the limit speed that can maintain the engine stable operation without stalling and ensure that the gear meshing surfaces are stably engaged without knocking noise. This lower limit of the limit speed is recorded as the critical speed. The critical power output of the range extender generator is determined based on the critical speed, and the critical power output is set to the preset idle power output value. After determining the critical speed, the output capacity of the range extender generator under drag resistance is calculated based on the critical speed. At this time, the engine is at the lower limit of the critical speed, and the engine output torque required to maintain this speed is extremely small. The electromagnetic conversion power of the range extender generator at this speed is the critical power generation. The critical power generation is locked as the preset idle power generation value allowed to be output in idle power generation mode, thereby ensuring that the power generation of the range extender is limited to the preset idle power generation value in the subsequent control process. This achieves the purpose of reducing the power generation to alleviate the battery charging pressure, and also eliminates the occurrence of gear knocking noise from the physical boundary.

[0034] In this embodiment, when the risk of overcharging cannot be eliminated by consuming electrical energy under high-voltage load, the range extender is controlled to enter the idle power generation mode. By keeping the engine fuel supply running continuously and reducing the power generation to a preset idle power generation value determined based on the critical speed of bench calibration, the power generation is effectively reduced to alleviate the battery charging pressure. This also fundamentally avoids torque reversal and knocking noise problems caused by insufficient extrusion pressure on the generator gear meshing surface due to fuel cut-off shutdown or low torque. This achieves multi-dimensional protection that balances battery overcharging safety, range extender operation stability, and gear mechanism reliability under extreme operating conditions.

[0035] In the embodiments of this application, step S4 specifically includes: S411, when the range extender enters the idle power generation mode, calculates in real time the sum of the current drive motor energy recovery power and the range extender idle power generation power; S412, if the total power is still greater than the sum of the charging power threshold and the target power, it is determined that the energy recovery power of the drive motor needs to be adjusted. S413, if the total power is less than or equal to the sum of the charging power threshold and the target power, then maintain the current vehicle energy recovery mode and range extender idle power generation mode.

[0036] In the specific implementation process, after the range extender is controlled to reduce its output and stably operate in the idle power generation mode, its power generation has dropped to the preset idle power generation value. At this time, the real-time energy recovery power generated by the drive motor based on the current vehicle speed and vehicle deceleration is continuously acquired, and the idle power generation of the range extender is acquired while maintaining the continuous operation state. The two are summed in real time to obtain the current total input power of the vehicle in the idle power generation mode, which serves as the basis for subsequent judgment of the vehicle's energy balance status and battery charging safety. The total input power of the vehicle in the idle power generation mode calculated above is compared in real time with the sum of the battery's current allowable charging power threshold and the target power being consumed by the high-voltage load of the vehicle. If the total input power still exceeds the sum of the battery's charging absorption capacity and the high-voltage load's consumption capacity, it means that even if the high-voltage load is fully consumed and the range extender has been reduced to an extremely low power generation capacity, the battery still faces the risk of overcharging. At this time, it is determined that relying solely on the high-voltage load consumption and the range extender's power reduction cannot completely eliminate the overcharging risk. It is necessary to intervene and adjust the energy recovery intensity at the drive motor end to further reduce the total input power of the vehicle. If the total power is less than or equal to the sum of the charging power threshold and the target power, then the current vehicle energy recovery mode and range extender idle power generation mode are maintained. If the total input power is less than or equal to the sum of the battery's charging absorption capacity and the high-voltage load consumption capacity, it means that after the range extender enters the idle power generation mode, the total input power of the vehicle is already within the range that the battery can safely withstand, and there is no risk of overcharging. At this time, there is no need to weaken the energy recovery effect of the drive motor. The range extender continues to maintain the idle power generation state with uninterrupted fuel supply, and the drive motor also maintains the current energy recovery torque to continue to perform kinetic energy recovery, maximizing energy recovery efficiency while ensuring battery safety.

[0037] In the embodiments of this application, step S4 further includes: S421 adjusts the energy recovery torque of the drive motor according to the torque reduction command, so as to simultaneously reduce the energy recovery power of the drive motor until the sum of the energy recovery power of the drive motor and the power generated by the range extender is less than or equal to the sum of the battery's allowable charging power threshold and the target power of the vehicle's high-voltage load.

[0038] In the specific implementation process, after determining that the energy recovery power of the drive motor needs to be adjusted, a torque reduction command is issued to the drive motor control system. Since the energy recovery power of the drive motor is positively correlated with the braking recovery torque it generates, by gradually reducing the energy recovery torque of the drive motor, the electromagnetic braking torque of the drive motor is reduced accordingly, thereby simultaneously reducing the electrical energy input from the drive motor to the battery. During the adjustment process, the real-time sum of the energy recovery power of the drive motor and the power generated by the range extender is continuously monitored. When this sum drops to the level equal to or less than the sum of the battery's allowable charging power threshold and the high-voltage load target power, it indicates that the power input and consumption absorption of the entire vehicle have reached a safe balance. At this point, further torque reduction commands are stopped to ensure that the battery does not experience overcharging.

[0039] In the embodiments of this application, step S421 specifically includes: S4211, within a preset adjustment cycle, decreases the energy recovery torque of the drive motor in a stepwise manner according to a fixed torque step size until the sum of the recovered power and the generated power is less than or equal to the sum of the charging power threshold and the target power.

[0040] In the specific implementation process, in order to avoid sudden changes in the driving motor's torque causing abrupt drag or drastic deceleration changes that would affect driving smoothness, a step-by-step reduction strategy is adopted to smoothly transition. A fixed time interval is set as the preset adjustment cycle, and a fixed torque reduction amount is set as the torque step size. At the end of each adjustment cycle, the energy recovery torque of the drive motor is reduced by one torque step size, so that the braking deceleration of the vehicle decreases slowly and uniformly. After each adjustment cycle, the sum of the current recovery power and the power generation power is recalculated and judged. If the safety balance condition is still not met, the torque is reduced by one torque step size in the next adjustment cycle. This process is repeated until the sum of the recovery power and the power generation power is less than or equal to the sum of the charging power threshold and the target power, thus completing the smooth torque reduction control.

[0041] In this embodiment, a progressive power overcharge prevention control strategy covering "high-voltage load consumption - range extender power reduction - drive motor energy recovery reduction" is constructed: after the range extender is reduced to idle power generation mode, if the total power still overflows, the total input power of the vehicle is precisely reduced to within the safe balance line by real-time accurate calculation and intervention adjustment of the drive motor energy recovery torque as needed, thus completely eliminating the risk of battery overcharging under extreme conditions; at the same time, during the torque reduction adjustment process, a step-by-step reduction strategy with fixed torque step size and adjustment period is adopted, so that the weakening of the drive motor power is smoothly transitioned, effectively avoiding the abrupt dragging feeling or violent deceleration jump caused by sudden changes in recovery torque. Under the premise of ensuring battery charging safety and continuous fuel operation of the range extender, the energy recovery efficiency is preserved to the maximum extent, and the smoothness of the vehicle deceleration process is significantly improved.

[0042] like Figure 2 As shown, based on the same inventive concept, this application also provides an energy management and control system for a range-extended electric vehicle corresponding to the above method; The system includes: The vehicle control module is used to determine when the vehicle enters energy recovery mode and to collect the energy recovery power of the drive motor, the power generation power of the range extender, and the battery's allowable charging power threshold. Other high-voltage load modules of the vehicle are communicatively connected to the vehicle control module and are used to receive control commands from the vehicle control module. The vehicle control module determines whether to maintain the current mode or send a start command to the other high-voltage load modules of the vehicle based on the judgment result of the sum of the recovered power and the generated power and the charging power threshold, and controls the other high-voltage load modules of the vehicle to start at the target power. The range extender control module is communicatively connected to the vehicle control module and is used to receive control commands from the vehicle control module. The vehicle control module determines whether to maintain the current mode or send an idle command to the range extender control module based on the judgment result of the sum of the recovered power and the generated power and the sum of the charging power threshold and the target power, thereby controlling the range extender to enter the idle power generation mode. The drive motor control module is communicatively connected to the vehicle control module and is used to receive control commands from the vehicle control module. Based on the judgment result of the sum of the recovered power and generated power in the idle power generation mode and the sum of the charging power threshold and the target power, the vehicle control module determines whether to maintain the current mode or send an adjustment command to the drive motor control module to adjust the energy recovery power of the drive motor until the sum of the recovered power and generated power is less than or equal to the sum of the charging power threshold and the target power.

[0043] The system also includes a battery management module, which is communicatively connected to the vehicle control module; Specifically, the vehicle control module collects the battery's allowable charging power threshold by receiving the battery's allowable charging power threshold fed back by the battery management module. Specifically, the vehicle control module collects the energy recovery power of the drive motor by receiving the energy recovery power fed back by the drive motor control module. Specifically, the vehicle control module collects the power generated by the range extender by receiving the power generated by the range extender control module.

[0044] The vehicle control module is responsible for data acquisition and control strategy determination; the battery management module is responsible for feedback of the maximum allowable charging power of the battery and responding to the charging needs of the vehicle; the drive motor control module is responsible for feedback of energy recovery power and execution of the vehicle's energy recovery function; and the range extender control module is responsible for feedback of power generation power and execution of power generation function. like Figure 3As shown, in the specific implementation process, when the vehicle enters the energy recovery mode, the vehicle control module collects the maximum allowable charging power threshold C of the battery, the energy recovery power A of the drive motor, and the current power generation power B of the range extender. The vehicle control module judges the power based on the collected data. When A+B>C, it controls other high-voltage load modules of the vehicle to start and work at the target power D to consume the excess power and avoid battery overcharging or engine fuel cut-off. When A+B > C+D, the range extender switches to idle power generation mode, reducing the power generation power B. If the total power of A+B is still greater than C+D, the vehicle control module controls the drive motor module to reduce the energy recovery power A until the total power of A+B is less than or equal to C+D. This strategy ensures that the range extender engine does not experience fuel cut-off under any operating conditions, thus resolving the knocking noise problem caused by gear reversal due to fuel cut-off.

[0045] Based on the same inventive concept, this application also provides an electronic device. The electronic device of this application includes at least one processor and at least one memory electrically connected to the processor. The memory is electrically connected to the processor, and the memory stores instructions executable by the at least one processor. These instructions are executed by the at least one processor to enable the at least one processor to perform the range-extended electric vehicle energy management control method as described above.

[0046] It should be noted that the electrical connections between the various units mentioned above do not necessarily represent the connections between lines. Any indirect connection method can be applied to the embodiments of this application as long as it achieves the purpose of this application.

[0047] Based on the same inventive concept, this application also provides a computer storage medium storing a computer program, which, when executed by a processor, implements the energy management control method for range-extended electric vehicles as described above.

[0048] Based on the same inventive concept, this application also provides a computer program product, which is stored in at least one storage medium; the computer program product includes several instructions to cause at least one computer device to execute the range-extended electric vehicle energy management control method as described above.

[0049] 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for energy management and control of a range-extended electric vehicle, characterized in that, After confirming that the vehicle has entered energy recovery mode, the energy recovery power of the drive motor, the power generation power of the range extender, and the battery's allowable charging power threshold are collected. Based on the result of judging the sum of the recovered power and the generated power and the charging power threshold, it is determined whether to maintain the current mode or control the high-voltage load of the vehicle to start at the target power. Based on the judgment result of the sum of the recovered power and the generated power and the sum of the charging power threshold and the target power, it is determined whether to maintain the current mode or control the range extender to enter the idle generation mode. Based on the judgment result of the sum of the recovered power and generated power in the idle power generation mode and the sum of the charging power threshold and the target power, it is determined whether to maintain the current mode or adjust the energy recovery power of the drive motor until the sum of the recovered power and the generated power threshold is less than or equal to the sum of the charging power threshold and the target power.

2. The method according to claim 1, characterized in that, The determination that the vehicle has entered energy recovery mode specifically includes: Real-time monitoring of the vehicle's operating status; When the target object releases the accelerator pedal or presses the brake pedal, the vehicle is determined to enter the energy recovery mode.

3. The method according to claim 1, characterized in that, The step of determining whether to maintain the current mode or control the vehicle's high-voltage load to start at the target power based on the result of judging the sum of the recovered power and the generated power and the charging power threshold specifically includes: Determine whether the sum of the recovered power and the generated power is greater than the charging power threshold; If not, maintain the current mode; If so, then control the high-voltage load of the entire vehicle to start at the target power.

4. The method according to claim 1, characterized in that, The step of determining whether to maintain the current mode or control the range extender to enter idle power generation mode based on the judgment result of the sum of the recovered power and the generated power and the sum of the charging power threshold and the target power specifically includes: Determine whether the sum of the recovered power and the generated power is greater than the sum of the charging power threshold and the target power; If not, maintain the current mode; If so, control the range extender to enter idle power generation mode; In the idle power generation mode, the range extender engine is controlled to maintain fuel supply and not stop, and the power generation of the range extender is controlled to be reduced to a preset idle power generation value, which is less than the power generation of the range extender in the normal power generation mode.

5. The method according to claim 4, characterized in that, The process of determining the preset idle power generation value specifically includes: Obtain the critical speed that the range extender engine can operate without stopping and without producing abnormal knocking noise during gear reversal; The critical power output of the range extender generator is determined based on the critical speed, and the critical power output is set to the preset idle power output value.

6. The method according to claim 1, characterized in that, The step of determining whether to maintain the current mode or adjust the energy recovery power of the drive motor based on the judgment result of the sum of the recovered power and the generated power in the idle power generation mode and the sum of the charging power threshold and the target power specifically includes: When the range extender enters the idle power generation mode, the sum of the current drive motor energy recovery power and the range extender idle power generation power is calculated in real time. If the total power is still greater than the sum of the charging power threshold and the target power, it is determined that the energy recovery power of the drive motor needs to be adjusted. If the total power is less than or equal to the sum of the charging power threshold and the target power, the current vehicle energy recovery mode and range extender idle power generation mode are maintained.

7. The method according to claim 1, characterized in that, The adjustment of the energy recovery power of the drive motor until the sum of the recovered power and the generated power is less than or equal to the sum of the charging power threshold and the target power specifically includes: According to the torque reduction command, the energy recovery torque of the drive motor is adjusted to simultaneously reduce the energy recovery power of the drive motor until the sum of the energy recovery power of the drive motor and the power generated by the range extender is less than or equal to the sum of the battery's allowable charging power threshold and the target power of the vehicle's high-voltage load.

8. The method according to claim 7, characterized in that, The adjustment of the energy recovery torque of the drive motor specifically includes: Within a preset adjustment cycle, the energy recovery torque of the drive motor is gradually reduced in steps according to a fixed torque step size until the sum of the recovered power and the generated power is less than or equal to the sum of the charging power threshold and the target power.

9. An energy management control system for a range-extended electric vehicle, characterized in that, The system includes: The vehicle control module is used to determine when the vehicle enters energy recovery mode and to collect the energy recovery power of the drive motor, the power generation power of the range extender, and the battery's allowable charging power threshold. Other high-voltage load modules of the vehicle are communicatively connected to the vehicle control module and are used to receive control commands from the vehicle control module. The vehicle control module determines whether to maintain the current mode or send a start command to the other high-voltage load modules of the vehicle based on the judgment result of the sum of the recovered power and the generated power and the charging power threshold, and controls the other high-voltage load modules of the vehicle to start at the target power. The range extender control module is communicatively connected to the vehicle control module and is used to receive control commands from the vehicle control module. The vehicle control module determines whether to maintain the current mode or send an idle command to the range extender control module based on the judgment result of the sum of the recovered power and the generated power and the sum of the charging power threshold and the target power, thereby controlling the range extender to enter the idle power generation mode. The drive motor control module is communicatively connected to the vehicle control module and is used to receive control commands from the vehicle control module. Based on the judgment result of the sum of the recovered power and generated power in the idle power generation mode and the sum of the charging power threshold and the target power, the vehicle control module determines whether to maintain the current mode or send an adjustment command to the drive motor control module to adjust the energy recovery power of the drive motor until the sum of the recovered power and generated power is less than or equal to the sum of the charging power threshold and the target power.

10. An electronic device, characterized in that, Includes at least one processor and at least one memory electrically connected; The memory is electrically connected to the processor, wherein the memory stores instructions executable by at least one of the processors, the instructions being executed by at least one of the processors to enable at least one of the processors to perform the range-extended electric vehicle energy management control method as described in any one of claims 1-8.

11. A computer storage medium, characterized in that, The computer-readable storage medium stores a computer program. When the computer program is executed by the processor, it implements the energy management control method for range-extended electric vehicles according to any one of claims 1-8.

12. A computer program product, characterized in that, The computer program product is stored in at least one storage medium; The computer program product includes several instructions for causing at least one electronic device to execute the range-extended electric vehicle energy management control method according to any one of claims 1-8.

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