An extender, a control method and device for an extender

Abstract

The present invention discloses a range extender, a range extender control method, and a range extender control device. By obtaining the vehicle's remaining battery charge and required traction power, the method determines the range extender's output power when the remaining battery charge cannot fully meet the required traction power. When the range extender power exceeds a set power threshold, it indicates that the range extender needs to output a higher range extender power to meet the required traction power. The range extender's engine output torque is controlled to vary in accordance with the range extender power. This method reduces the adverse impact of the range extender on the vehicle's acoustic and vibration roughness caused by noise generated by excessive engine speed when increasing the range extender power in conventional methods. By controlling the engine output torque to vary in accordance with the range extender power, the method ensures that the range extender power meets the output requirement while reducing the impact of the range extender's noise on the vehicle's acoustic and vibration roughness.

Description

Technical Field

[0001] The present application relates to the technical field of range extender control, and in particular to a range extender, a control method and a device for the range extender. Background Art

[0002] Hybrid power systems are currently the most promising vehicle models in the market, among which extended-range power systems are becoming increasingly popular. Compared with traditional vehicles, they significantly reduce vehicle fuel consumption and emissions by matching the engine's high-efficiency operating point, achieving the National VI / National VII emission regulations. Compared with HEV (Hybrid Electric Vehicle) and PHEV (Plug-in hybrid electric vehicle) hybrid models, range extenders minimize range anxiety and achieve the mileage of traditional vehicles with a pure electric driving experience.

[0003] In hybrid architectures, a range extender is a component of an electric vehicle that provides additional electrical energy, thereby increasing the mileage of the electric vehicle. A range extender is a combination of an engine and a generator. The range extender only provides electrical power; the engine does not directly drive the vehicle's mechanical components. This means the range extender is completely decoupled from the vehicle's transmission mechanism, and its operating point has no direct relationship to vehicle speed. Currently, range extender control strategies mostly employ fixed-point and power-following strategies, resulting in low vehicle noise, vibration, and harshness (NVH) ratings.

[0004] Therefore, how to reduce the impact of the range extender on the vehicle's acoustic and vibration roughness is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] A range extender, a range extender control method, and a range extender control device of the present invention reduce the impact of the range extender on the acoustic vibration roughness of a vehicle.

[0006] The embodiments of the present invention provide the following solutions:

[0007] In a first aspect, an embodiment of the present invention provides a method for controlling a range extender, including:

[0008] Obtain the vehicle's remaining battery power and required traction power;

[0009] determining the extended-range power output by the range extender according to the remaining battery power and the required traction power;

[0010] When the range-extending power is greater than a set power threshold, the engine output torque of the range extender is controlled to change correspondingly with the range-extending power.

[0011] In an optional embodiment, controlling the engine output torque of the range extender to change accordingly with the range-extending power includes:

[0012] When the remaining battery power is less than a first power threshold, determining the set torque of the engine according to the extended-range power and a preset first correspondence relationship, wherein the first correspondence relationship is a linear variation relationship between the output torque and the extended-range power of the engine at the same speed;

[0013] The range extender is controlled to output the extended-range power according to the set torque.

[0014] In an optional embodiment, after controlling the range extender to output the extended-range power according to the set torque, the method further includes:

[0015] When the remaining power of the battery is less than a second power threshold, controlling the range extender to output maximum power according to the maximum torque of the engine, wherein the second power threshold is less than the first power threshold;

[0016] The remaining power is determined according to the difference between the maximum power and the extended-range power, and the remaining power is output to a power battery of the vehicle.

[0017] In an optional embodiment, after determining the extended-range power output by the range extender according to the remaining battery power and the required traction power, the method further includes:

[0018] Obtaining a second corresponding relationship between the extended-range power and the engine control parameter;

[0019] When the extended-range power is not greater than a set power threshold, determining a target control parameter of the engine according to the extended-range power and the second correspondence, wherein the target control parameter is a control parameter of a minimum fuel amount when the engine outputs the extended-range power;

[0020] The range extender is controlled to output the extended-range power according to the target control parameter.

[0021] In an optional embodiment, after controlling the range extender to output the extended-range power according to the target control parameter, the method further includes:

[0022] updating the target control parameter when the extended-range power changes;

[0023] The range extender is controlled to output the changed extended-range power according to the updated target control parameter.

[0024] In an optional embodiment, controlling the range extender to output the extended-range power according to the target control parameter includes:

[0025] determining a target speed and a target torque of the engine according to the target control parameters;

[0026] The range extender is controlled to output the extended-range power according to the target speed and the target torque.

[0027] In a second aspect, an embodiment of the present invention further provides a range extender, which is controlled by any method described in the first aspect.

[0028] In a third aspect, an embodiment of the present invention further provides a control device for a range extender, comprising:

[0029] A first acquisition module is used to obtain the remaining battery power and traction power requirement of the vehicle;

[0030] a first determining module, configured to determine the extended-range power output by the range extender according to the remaining battery power and the required traction power;

[0031] The first control module is configured to control the engine output torque of the range extender to change in accordance with the range extender power when the range extender power is greater than a set power threshold.

[0032] In a fourth aspect, an embodiment of the present invention further provides an electronic device comprising a processor and a memory, wherein the memory is coupled to the processor and stores instructions, which, when executed by the processor, enable the electronic device to perform the steps of any one of the methods described in the first aspect.

[0033] In a fifth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the methods described in the first aspect.

[0034] Compared with the prior art, the range extender, range extender control method, and range extender device of the present invention have the following advantages:

[0035] The control method of the present invention obtains the vehicle's remaining battery charge and the required traction power. If the remaining battery charge cannot fully meet the required traction power, it determines the range extender's output power. When the range extender power exceeds a set power threshold, it indicates that a higher range extender output power is required to meet the required traction power. The range extender's engine output torque is then controlled to follow the range extender power. This method reduces the adverse impact of the range extender on vehicle harshness caused by noise generated by excessive engine speed when increasing the range extender power, as is conventionally done. By controlling the engine output torque to follow the range extender power, it ensures that the range extender power meets the required output while reducing the impact of the range extender's noise on vehicle harshness. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A flow chart of a control method for a range extender provided in an embodiment of the present invention;

[0038] Figure 2 This is a cloud diagram of the extended-range power of the constant speed power following strategy provided by an embodiment of the present invention;

[0039] Figure 3 A range-extended power cloud diagram of the range extender optimization strategy provided by an embodiment of the present invention;

[0040] Figure 4 A logic diagram of the range extender control strategy provided by an embodiment of the present invention;

[0041] Figure 5 A schematic structural diagram of a control device for a range extender provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the embodiments of the present invention.

[0043] Current control strategies for range extenders primarily include a fixed-point strategy for multiple operating conditions and a power-following strategy. The fixed-point strategy selects multiple power matching points based on the vehicle's common operating conditions to control the range extender's output power. By outputting the extended power at fixed-point conditions, when the vehicle's power requirements are exceeded, the excess power is used to charge the battery. When power generation is insufficient, the battery generates power to compensate. Due to the low switching frequency of speed points, this control strategy results in high-frequency charging and discharging, potentially leading to repeated charging and discharging of certain storage points. This is particularly true during high-speed operation, where high power demands and prolonged high-power fixed-point power generation can significantly damage battery life. The power-following strategy, based on the optimal efficiency point for different extended-range power levels, allows the range extender's matching point to follow the vehicle's power requirements. By selecting the appropriate matching point based on the vehicle's power requirements, the range extender's power output closely matches the vehicle's power requirements, eliminating frequent battery charging and discharging. Furthermore, the range extender's economical efficiency is optimized. However, the acoustic and vibration harshness level in power-following mode is poor, and the high speed of the range extender at the same power level can be difficult for users to accept. Compared to traditional vehicles, hybrid vehicles are heavier, especially PHEVs, often exhibiting a "small horse pulling a large cart" phenomenon. In both existing modes, the range extender experiences high speeds when the battery is low, significantly impacting acoustic and vibration harshness. The following details how the control method of the present invention addresses this issue.

[0044] See also Figure 1 , Figure 1 A flow chart of a control method for a range extender is provided for an embodiment of the present invention, including:

[0045] S11. Obtain the remaining battery power and required traction power of the vehicle.

[0046] Specifically, the remaining battery charge is the amount of energy in the vehicle's power battery that can drive the vehicle. This can be represented by the battery's SOC (State of Charge); of course, it can also be represented by collecting the vehicle's power battery voltage. The required traction power is the power required to move the vehicle and can be calculated based on the vehicle's speed and acceleration. After obtaining the remaining battery charge and required traction power, the process proceeds to step S12.

[0047] S12: Determine the extended-range power output by the range extender according to the remaining battery power and the required traction power.

[0048] Specifically, when the vehicle's power battery's remaining charge is insufficient to provide the required traction power, it indicates low battery charge and requires the range extender to compensate for the insufficient power demand. The range extender power is the difference between the required traction power and the power corresponding to the battery's remaining charge. After determining the range extender's output power, the process proceeds to step S13.

[0049] S13: When the range-extending power is greater than a set power threshold, controlling the engine output torque of the range extender to change accordingly with the range-extending power.

[0050] Specifically, when the range-extending power is greater than the set power threshold, it indicates that the range-extending power required to be output by the range extender is relatively large. If conventional methods of increasing the engine speed in the range extender are used, this may have an adverse effect on the vehicle's acoustic roughness. Therefore, the engine output torque of the range extender is controlled to change accordingly with the range-extending power. It can be understood that the range-extending power is the product of the engine speed and the output torque. When the demand for the range-extending power output increases, the output torque of the engine is controlled to increase accordingly; conversely, when the demand for the range-extending power output decreases, the output torque of the engine is controlled to decrease accordingly. Under the premise of ensuring that the range-extending power output requirements can be met, the engine speed should be reduced as much as possible to reduce the impact of the range extender on the vehicle's acoustic roughness. Those skilled in the art will understand that the power threshold can be set based on the experience of technicians or determined through calibration experiments, as long as it meets the vehicle's acoustic roughness requirements.

[0051] In a specific embodiment, controlling the engine output torque of the range extender to change correspondingly with the range-extending power includes:

[0052] When the remaining battery power is less than a first power threshold, the set torque of the engine is determined based on the extended-range power and a preset first corresponding relationship, wherein the first corresponding relationship is a linear change relationship between the engine output torque and the extended-range power at the same speed; according to the set torque, the range extender is controlled to output the extended-range power.

[0053] Specifically, if the remaining battery charge is less than a first charge threshold, it indicates that the vehicle's power battery may not be able to meet the required traction power. Therefore, the range extender needs to be activated to work with the power battery to provide the required traction power. Since the range extender power is the product of engine speed and output torque, and the range extender power increases linearly with increasing output torque at a constant speed, a set engine torque can be determined based on a preset first correspondence between the range extender power and the range extender power. The range extender's output of the range extender power can then be controlled based on the set torque, ensuring that the required range extender power is achieved while maintaining the same speed.

[0054] It should be noted that, since the range-extending power corresponding to continuously increasing the output torque at a fixed speed has an upper limit, the engine speed can be increased accordingly as the range-extending power increases. Figure 2The horizontal axis in the figure represents the engine speed, and the vertical axis represents the output torque. The curves in the figure correspond to percentages of the range extender's rated power, specifically 10%-70%. In this cloud chart, the grayscale from dark to light represents the engine's fuel economy. The lighter the grayscale, the better the fuel economy; conversely, the darker the grayscale, the worse the fuel economy. Therefore, it is necessary to keep the engine's output torque and speed corresponding to the light-colored area as much as possible. The speed can be defined as multiple fixed speeds as needed, and the output torque can be increased at the corresponding fixed speed according to the range extender power to meet the required output of the range extender power.

[0055] In actual implementation, if the remaining battery power is too low, the vehicle's power battery may be damaged due to severe power loss.

[0056] To solve the above problem, in a specific embodiment, after controlling the range extender to output the extended range power according to the set torque, the method further includes:

[0057] When the remaining battery power is less than a second power threshold, the range extender is controlled to output maximum power according to the maximum torque of the engine, wherein the second power threshold is less than the first power threshold; the remaining power is determined according to the difference between the maximum power and the extended-range power, and the remaining power is output to the vehicle's power battery.

[0058] Specifically, if the remaining battery power is less than the second power threshold, it means that the vehicle's power battery is in a seriously depleted state. To reduce the impact on the battery life, the range extender is controlled to output maximum power according to the maximum torque of the engine, and the remaining power is determined according to the difference between the maximum power and the extended-range power. The remaining power is the excess power of the range extender after meeting the vehicle's traction demand power. The remaining power is output to the vehicle's power battery, which can charge the power battery and reduce the impact of the seriously depleted power battery on the battery life.

[0059] In specific implementation, increasing the range-extending power only by increasing the output torque to match the required traction power may result in higher fuel consumption of the engine in the range extender and higher vehicle driving costs.

[0060] To solve the above problem, in a specific embodiment, after determining the extended range power output by the range extender according to the remaining battery power and the required traction power, the method further includes:

[0061] A second correspondence between the extended-range power and the engine control parameter is obtained; when the extended-range power is not greater than a set power threshold, a target control parameter of the engine is determined based on the extended-range power and the second correspondence, wherein the target control parameter is a control parameter of a minimum fuel amount when the engine outputs the extended-range power; and the range extender is controlled to output the extended-range power based on the target control parameter.

[0062] Specifically, engine control parameters related to fuel quantity include engine speed, intake air temperature, intake air volume, and output torque. To achieve the same extended-range power, different control parameters can be configured, and different control parameters correspond to different fuel quantities. When the extended-range power is not greater than the set power threshold, it indicates that the required extended-range power output of the range extender is low, and the engine's fuel economy needs to be considered. Based on the extended-range power and the second corresponding relationship, the target control parameters of the engine are determined to reduce fuel consumption. The range extender's output of extended-range power is controlled according to the target control parameters, ensuring that the range extender outputs an extended-range power that meets the required traction power while maintaining excellent fuel economy.

[0063] In a specific embodiment, after controlling the range extender to output the extended-range power according to the target control parameter, the method further includes:

[0064] When the extended-range power changes, the target control parameter is updated; and according to the updated target control parameter, the range extender is controlled to output the changed extended-range power.

[0065] Specifically, controlling the range extender to output the extended-range power according to the target control parameter is a fixed-point control strategy. When the extended-range power changes, the target control parameter is correspondingly updated so that the range extender outputs the required extended-range power.

[0066] In a specific embodiment, controlling the range extender to output extended-range power according to the target control parameter includes:

[0067] According to the target control parameters, the target speed and target torque of the engine are determined; according to the target speed and target torque, the range extender is controlled to output the extended range power.

[0068] For details, please refer to Figure 3 , the way of representing each parameter in the figure is the same as Figure 2 Similarly, when the extended-range power is not greater than the set power threshold, if the extended-range power changes, in order for the range extender to output the extended-range power, the target control parameters need to be updated accordingly. For example, the current target control parameters are at control point 1. When the extended-range power increases and changes, the target control parameters are adjusted from control point 1 to the speed and torque corresponding to control point 2 to output the required extended-range power. The speed corresponding to the control point is relatively low, and the impact on the vehicle's acoustic vibration roughness is relatively small. Better fuel economy can be achieved while meeting the extended-range power and acoustic vibration roughness requirements. It can be seen from the figure that the power threshold can be set to 50% of the rated power of the range extender.

[0069] The following embodiments of the present invention are combined with Figure 4 The present invention specifically describes how to use SOC as a reference to implement the control method proposed in the present invention when controlling the entire vehicle.

[0070] Step 1: First, identify the driver's vehicle driving mode and determine whether the range extender is turned on based on the vehicle's battery SOC.

[0071] Step 2: Based on SOC, determine the operating point of the range extender. When SOC ≤ a certain power A, it means that the power battery cannot provide enough traction power. Start the range extender and enter the fixed point 1 operating condition, that is, Figure 3 At control point 1 in the figure, the engine speed is low and has little impact on the vehicle's acoustic and vibration roughness.

[0072] Step 3: When SOC≤Ab, enter the fixed point 2 working condition from fixed point 1, that is, Figure 3 Control point 2 in the figure, under this working condition, the engine speed is medium speed and the range extender is at the best point of fuel economy.

[0073] Step 4: When SOC≤Abc, the range-extending power output by the range extender is further increased, and the fixed-point mode enters the fixed-speed power following mode, increasing the output torque of the engine at a fixed speed. The engine is at a medium-high speed and the acoustic and vibration roughness is good.

[0074] Step 5: When SOC≤Abcd, it means that the vehicle's power battery is seriously depleted. The range extender's output power will reach its maximum. The range extender's constant speed power follows and enters the maximum power point. The remaining power is output to the power battery for storage.

[0075] Step 6: When the SOC power gradually increases, based on the power level, determine whether to enter the fixed point / constant speed power following mode.

[0076] Step 7: If the SOC is greater than or equal to A+e, the range extender is turned off and the vehicle enters EV mode (or pure electric drive mode). A, b, c, d, and e are greater than 0. Their specific values can be determined through experience or calibration tests, and are not detailed here.

[0077] Based on the same inventive concept as the control method, an embodiment of the present invention further provides a range extender, which is controlled by any of the methods described in the control method.

[0078] Based on the same inventive concept as the control method, the embodiment of the present invention also provides a control device for a range extender, see Figure 5 ,include:

[0079] A first acquisition module 501 is used to obtain the remaining battery power and traction power requirement of the vehicle;

[0080] A first determining module 502 is configured to determine the extended-range power output by the range extender according to the remaining battery power and the required traction power;

[0081] The first control module 503 is configured to control the engine output torque of the range extender to change in accordance with the range extender power when the range extender power is greater than a set power threshold.

[0082] In an optional embodiment, the first control module includes:

[0083] a first determining submodule, configured to determine, when the remaining battery power is less than a first power threshold, a set torque of the engine based on the extended-range power and a preset first correspondence relationship, wherein the first correspondence relationship is a linear variation relationship between the output torque and the extended-range power of the engine at the same speed;

[0084] The first control submodule is configured to control the range extender to output the extended-range power according to the set torque.

[0085] In an optional embodiment, the first control module further includes:

[0086] a second control submodule, configured to control the range extender to output a maximum power according to the maximum torque of the engine when the remaining power of the battery is less than a second power threshold, wherein the second power threshold is less than the first power threshold;

[0087] The output submodule is used to determine the remaining power according to the difference between the maximum power and the extended-range power, and output the remaining power to the power battery of the vehicle.

[0088] In an optional embodiment, the device further includes:

[0089] a second acquisition module, configured to acquire a second correspondence between the extended-range power and the engine control parameter;

[0090] a second determining module, configured to determine, when the extended-range power is not greater than a set power threshold, a target control parameter of the engine based on the extended-range power and the second correspondence, wherein the target control parameter is a control parameter of a minimum fuel amount when the engine outputs the extended-range power;

[0091] The second control module is configured to control the range extender to output the extended-range power according to the target control parameter.

[0092] In an optional embodiment, the device further includes:

[0093] an updating module, configured to update the target control parameter when the extended-range power changes;

[0094] A third control module is configured to control the range extender to output the changed extended-range power according to the updated target control parameter.

[0095] In an optional embodiment, the third control module includes:

[0096] a second determining submodule, configured to determine a target speed and a target torque of the engine according to the target control parameter;

[0097] The third control submodule is configured to control the range extender to output the extended-range power according to the target speed and the target torque.

[0098] Based on the same inventive concept as the control method, an embodiment of the present invention also provides an electronic device, including a processor and a memory, wherein the memory is coupled to the processor, and the memory stores instructions, which, when executed by the processor, enable the electronic device to perform the steps of any one of the control methods.

[0099] Based on the same inventive concept as the control method, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the control methods.

[0100] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0101] 1. By obtaining the vehicle's remaining battery charge and required traction power, the range extender's output power is determined when the remaining battery charge cannot fully meet the required traction power. When the range extender's output power exceeds a set power threshold, it indicates that a higher range extender output power is required to meet the required traction power. The range extender's engine output torque is controlled to follow the range extender's output power. This method reduces the adverse impact of the range extender on vehicle harshness caused by noise generated by excessive engine speed when increasing the range extender power by conventional methods. By controlling the engine output torque to follow the range extender power, it ensures that the range extender power meets the output requirement while reducing the impact of the range extender's noise on vehicle harshness.

[0102] 2. The control method of the present invention is based on the advantages of fixed-point and fixed-speed power following, taking into account the fuel economy of the entire vehicle, so that the vehicle still has good NVH performance when traveling at high speed.

[0103] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0104] The present invention is described with reference to flowcharts and / or block diagrams of methods, apparatus (modules, systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0105] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0106] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0107] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0108] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A control method for a range extender, characterized in that: include: Obtain the vehicle's remaining battery power and required traction power; determining the extended-range power output by the range extender according to the remaining battery power and the required traction power; When the range-extending power is greater than a set power threshold, controlling the engine output torque of the range extender to change accordingly with the range-extending power; The controlling the engine output torque of the range extender to change accordingly with the range-extending power includes: When the remaining battery power is less than a first power threshold, determining the set torque of the engine according to the extended-range power and a preset first correspondence relationship, wherein the first correspondence relationship is a linear variation relationship between the output torque and the extended-range power of the engine at the same speed; The range extender is controlled to output the extended-range power according to the set torque.

2. The control method of the range extender according to claim 1, characterized in that: After controlling the range extender to output the extended-range power according to the set torque, the method further includes: When the remaining power of the battery is less than a second power threshold, controlling the range extender to output maximum power according to the maximum torque of the engine, wherein the second power threshold is less than the first power threshold; The remaining power is determined according to the difference between the maximum power and the extended-range power, and the remaining power is output to a power battery of the vehicle.

3. The control method of the range extender according to claim 1, characterized in that: After determining the extended-range power output by the range extender according to the remaining battery power and the required traction power, the method further includes: Obtaining a second corresponding relationship between the extended-range power and the engine control parameter; When the extended-range power is not greater than a set power threshold, determining a target control parameter of the engine according to the extended-range power and the second correspondence, wherein the target control parameter is a control parameter of a minimum fuel amount when the engine outputs the extended-range power; The range extender is controlled to output the extended-range power according to the target control parameter.

4. The control method of the range extender according to claim 3, characterized in that: After controlling the range extender to output the extended-range power according to the target control parameter, the method further includes: updating the target control parameter when the extended-range power changes; The range extender is controlled to output the changed extended-range power according to the updated target control parameter.

5. The control method of the range extender according to claim 3, characterized in that: The controlling the range extender to output the extended-range power according to the target control parameter includes: determining a target speed and a target torque of the engine according to the target control parameters; The range extender is controlled to output the extended-range power according to the target speed and the target torque.

6. A range extender, characterized in that: The range extender is controlled by the method according to any one of claims 1 to 5.

7. A control device for a range extender, characterized in that: include: A first acquisition module is used to obtain the remaining battery power and traction power requirement of the vehicle; a first determining module, configured to determine the extended-range power output by the range extender according to the remaining battery power and the required traction power; a first control module, configured to control the engine output torque of the range extender to change accordingly with the range extender power when the range extender power is greater than a set power threshold; a first determination submodule, configured to determine, when the remaining battery power is less than a first power threshold, a set torque of the engine based on a first correspondence between the range-extending power and a preset first correspondence, wherein the first correspondence is a linear variation relationship between the output torque and the range-extending power of the engine at the same speed; and to control the range extender to output the range-extending power based on the set torque.

8. An electronic device, characterized in that: The electronic device comprises a processor and a memory, wherein the memory is coupled to the processor and stores instructions, and when the instructions are executed by the processor, the electronic device executes the steps of the method according to any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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