A start-stop control method for a range extender system of a multi-mode adaptive amphibious vehicle

Abstract

The present invention relates to the field of control of range-extended hybrid vehicles, and specifically discloses a start-stop control method for a range extender system of a multi-mode adaptive amphibious vehicle. The method includes: switching to a corresponding working mode according to the driving environment of the vehicle, and the range extender system adaptively adjusts to the power generation condition or the stop condition according to different working modes; start-stop control of the range extender system, which includes a range extender starting module and a range extender stopping module, and the engine starting module is further divided into a starter emergency starting mode and an ISG reverse-dragging engine starting mode; the present invention can meet the driver's task requirements while more fully coordinating the operating states of various components, improving the energy output efficiency. During the start-up process of the range extender system of the present invention, the start-up and response are faster, the fuel consumption and emissions are lower, and at the same time, the mode of starting the engine with the starter is retained to cope with emergencies, improving the stability and reliability of the overall system.

Description

Technical Field

[0001] The invention relates to the field of range-extended hybrid electric vehicle control, and in particular to a multi-mode adaptive start-stop control method for a range-extended system of an amphibious vehicle. Background Art

[0002] Amphibious vehicles are a unique means of transportation. The body is sealed and the chassis design takes both land and water into consideration. Land travel relies on the friction between the wheels and the ground, and the transmission system transmits the power of the engine or motor to the wheels for driving; water travel relies on devices such as propellers or water jets to generate thrust using the engine or motor. Its suspension system needs to adapt to different land and water environments. On land, it can reduce shock to ensure comfort and stability, and in water, it can adjust according to the change of buoyancy and withstand the impact of water in and out, so that it can travel on land and water. It can be used in military, rescue, tourism and other fields. In order to cope with complex and changeable driving needs, amphibious vehicles often use hybrid power for driving. When driving on land, hybrid power can avoid engine idling loss in pure electric mode in congested road conditions, and the engine can efficiently supply energy at high speed or long distances; when driving on water, the power source is flexibly allocated according to the speed and load, and the electric power assists low-speed navigation, while the engine ensures high-speed and heavy-load propulsion. At the same time, electric power can instantly release high torque to assist starting and acceleration on land and water, and the engine's continuous power output ensures long-distance driving. The two work together to optimize power performance and can effectively reduce emissions, which is in line with environmental protection trends.

[0003] The range-extending system control of the amphibious heavy-duty hybrid transport vehicle can effectively balance the workload between the engine and the battery-motor system, extend the service life of the engine and battery, ensure smooth and continuous power output, and ensure the reliability and stability of the vehicle; by adjusting the start and stop of the engine in different usage scenarios, it can effectively improve fuel utilization and reduce energy waste. At the same time, it can also optimize the battery charging state, ensure that the engine operates in the high-efficiency power generation range, extend the vehicle's cruising range, and optimize the vehicle's energy utilization in water and land environments.

[0004] The hybrid water-land amphibious vehicle designed in Patent CN113928064B mainly focuses on the overall structure, component layout, connection relationship between components, and function realization of the hybrid water-land amphibious vehicle, without elaborating on how to control its range extender system. Moreover, this vehicle model lacks a main drive motor, which may lead to limited peak torque output and insufficient power under extreme conditions. A control method for a hybrid-excitation internal combustion power generation range extender system of an electric vehicle disclosed in Patent CN108407624A does not optimize the vehicle startup process. The engine still uses a starter for startup, with limited startup torque, relatively slow startup speed, and high fuel consumption during startup. A full-condition control method for a permanent magnet synchronous range extender system disclosed in Patent CN108621809A only mentions using an ISG motor to drag the engine in reverse for startup and does not design to use the engine's own starting motor for startup. Without a backup startup method, it poses higher requirements for startup reliability, has high requirements for battery power and status, has a single-point failure risk, and relies on the ISG motor and related systems. Summary of the Invention

[0005] An object of the present invention is to provide a start-stop control method for a range extender system of a multi-mode adaptive water-land amphibious vehicle to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] Term Explanation:

[0008] ISG motor: The ISG motor is a motor that integrates the functions of a starter and a generator. Its structure includes a stator, a rotor, and a cooling system. It generates electricity through electromagnetic induction and starts through Ampere force. In the engine range extender system, it is used to generate electricity to supplement energy, start the engine, and assist in power output.

[0009] Power battery: The power battery is a key energy storage device in vehicle power systems such as the engine range extender system. It can store electrical energy generated by a generator (such as an ISG motor), can also receive and store the energy recovered from vehicle braking, and provides power to the drive motor when the vehicle needs power.

[0010] High-voltage distribution box: The high-voltage distribution box is a key component in the vehicle's high-voltage system. It has an input interface connected to the power battery, output interfaces connected to various high-voltage electrical equipment, and contains various circuit components inside. Its main functions are to distribute electrical energy, provide safety protection, and conduct status monitoring.

[0011] Transfer case: A transfer case is a power distribution device applied to amphibious vehicles or water-powered equipment. Through components such as gears and clutches, it can selectively or simultaneously distribute the engine power to different output components such as propellers and drive wheels to achieve power transmission under different driving conditions on water and land.

[0012] ACC: The ACC gear of a vehicle is a gear position of the vehicle ignition switch. In this gear position, some electrical equipment of the vehicle, such as radios and cigarette lighters, can be powered on and work, but the engine and the main power system are in an unstarted state.

[0013] VCU: VCU, i.e., Vehicle Control Unit, is the core control component of electric vehicles or hybrid vehicles. It collects signals from various vehicle sensors and precisely controls the power distribution, energy management, safety monitoring, and coordinated operation of various components of the whole vehicle according to preset algorithms to ensure the efficient, stable, and safe operation of the vehicle.

[0014] A start-stop control method for a multi-mode adaptive range extender system of an amphibious vehicle, the method comprising:

[0015] Switch to the corresponding working mode according to the driving environment of the vehicle, and the range extender system adaptively adjusts to the power generation condition or the stop condition according to different working modes;

[0016] Start-stop control of the range extender system, which includes a range extender start module and a range extender stop module. Among them, in the range extender start module, when the fault level judgment module determines that there are no major faults affecting the driving function of the whole vehicle, the high-voltage power-on is completed, and the whole vehicle sends an engine start request signal and there is no engine stop instruction, then it can enter the engine start module;

[0017] The engine start module is further divided into a starter emergency start mode and an ISG reverse-dragging engine start mode; the main difference between the two lies in whether the driver presses the emergency start switch. When the driver presses the emergency start switch, it enters the starter emergency start mode, and when the emergency start switch is closed and there is a signal allowing the ISG to reverse-drag and start the engine output by the fault level judgment module, and the battery normally supplies power to the ISG, then it can enter the ISG reverse-dragging engine start mode.

[0018] As a further technical solution of the present invention, in the step of switching to the corresponding working mode according to the driving environment of the vehicle, and the range extender system adaptively adjusts to the power generation condition or the stop condition according to different working modes:

[0019] The working modes include an on-land working mode, an on-water working mode, and a mode of getting on and off a beach ship:

[0020] After the vehicle's ACC gear is turned on, it will enter the state selection stage; when the onshore working mode switch is activated, the vehicle will enter the onshore working mode; if the vehicle is about to enter the water, the beach landing ship mode switch should be activated, and at this time the vehicle will switch from the onshore working mode to the beach landing ship mode; after the vehicle successfully enters the water, activate the water working mode switch, and the vehicle will switch to the water working mode; these three main working modes can be further subdivided according to the states of each component. According to the differences in various driving conditions and driving requirements, the range extender will adaptively enter the power generation condition or the shutdown condition in each working mode.

[0021] As a further technical solution of the present invention, the onshore working mode can be divided into a parking charging mode, an energy recovery mode, a silent driving mode, a pure electric driving mode, a pure fuel navigation mode, a power generation driving mode, and a hybrid driving mode; among them, the parking charging mode, the pure fuel navigation mode, the power generation driving mode, and the hybrid driving mode require the range extender to start and enter the power generation condition. After the vehicle's working mode is judged, a start command will be output to the range extender system:

[0022] If the vehicle's required power is 0 and the vehicle speed is less than the parking set vehicle speed, then the SOC will be judged. When the battery SOC is less than the set value, the vehicle will enter the parking charging mode;

[0023] If the vehicle's required power is not 0 and the vehicle speed is greater than the set vehicle speed, then the required power will be judged; if the maximum power of the engine is greater than the vehicle's required power, then it will be judged whether the battery SOC is greater than the set SOC. If it is greater, the vehicle will enter the pure fuel navigation mode; if it is less, the vehicle will enter the power generation driving mode; if the maximum power of the engine is less than the vehicle's required power, the vehicle will enter the hybrid driving mode.

[0024] As a further technical solution of the present invention, for the water working mode: after the vehicle enters the water working mode, the system will first detect the silent mode switch. If the switch is on and the battery SOC is less than the set value, it will be judged together with the case where the pure electric silent switch is not on whether the hybrid mode switch is on;

[0025] If the hybrid mode switch is on, then continue to judge whether the battery SOC is greater than the set value; if it is greater than the set value, the vehicle will enter the hybrid mode; if it is less than the set value, it will be judged together with the case where the hybrid mode switch is not on the size of the required power and the maximum power of the engine;

[0026] If the maximum power of the engine is greater than the required power, then continue to judge whether the battery SOC is greater than the set value. If it is less than the set value, the vehicle will enter the power generation navigation mode; if it is greater than the set value, the vehicle will enter the pure fuel navigation mode;

[0027] If the maximum power of the engine is less than the required power, the vehicle will enter the hybrid navigation mode;

[0028] Among them, in the power generation navigation mode, pure oil navigation mode, and hybrid navigation mode, the range extender will adapt to the requirements of the working mode and start accordingly.

[0029] As a further technical solution of the present invention, for the up and down beach ship mode: when the vehicle selects the up and down beach ship mode, the system will evaluate whether the maximum output power of the engine is greater than the vehicle's demand power. If the engine output power is greater than the demand power, the vehicle will enter the pure oil beach landing mode; otherwise, the vehicle will enter the hybrid beach landing mode; in both of these modes, an extender start signal will be output to keep the range extender in an operating state.

[0030] As a further technical solution of the present invention, for the starter emergency start mode: after entering the starter emergency start mode, the VCU requests the ISG to enter the idle speed. When the key is turned to the Start gear position, the VCU outputs a starting request switch signal to the ECU to control the engagement of the starter relay, and the engine starts, with speed control; furthermore, the VCU controls the ISG speed to synchronize with the engine. After the difference between the ISG speed and the engine speed is within the calibrated range, the VCU outputs a signal to the hydraulic controller to control the clutch to engage; after the clutch is confirmed to be engaged, the ISG is adjusted to the active discharge mode and no longer receives the speed control command.

[0031] As a further technical solution of the present invention, for the ISG reverse towing engine start mode: after entering the ISG reverse towing engine start mode, first, the VCU requests the ISG motor torque mode to output and enters the low-speed state; after the difference between the ISG speed and the engine speed is within the calibrated range, the VCU outputs a signal to the hydraulic controller to control the clutch to engage; according to the fluctuation of the ISG torque, it is judged whether the ISG is engaged. After the clutch is confirmed to be engaged, the ISG speed automatically increases step by step to tow the engine into the idle speed; when the engine speed reaches the starting speed condition, the engine starts and speed control is adopted, and the ISG motor is switched from the drive mode to the power generation mode.

[0032] As a further technical solution of the present invention, in the range extender shutdown module, when the fuel level is lower than the minimum fuel level threshold, the vehicle is in the parking charging state, the vehicle Ready signal is 0, or there is a major fault in the drive component that affects the vehicle's driving function, the vehicle will send a request for the engine to shut down; if the engine start request signal is 0 or the engine shutdown request signal is 1, then at this time the range extender will enter the shutdown module;

[0033] After entering the shutdown module, the VCU will output an ISG clutch disconnection signal. After the clutch is confirmed to be disconnected, the VCU requests the ISG to enter the drive mode to supply power to the battery. The battery supplies power to the accessory system and requests the engine to shut down;

[0034] After the range extender shutdown is completed, it will re-enter the initialization state.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] The present invention designs a start-stop control method for a multi-mode adaptive range extender system for the complex driving environment of an amphibious vehicle. Compared with the existing technology, the present invention can switch to the corresponding optimal working mode according to the driving environment of the vehicle, so that the range extender system can be adaptively adjusted to the power generation working condition or the stop working condition according to different working modes, achieving the satisfaction of the driver's task requirements while more fully coordinating the operating states of each component and improving the energy output efficiency. At the same time, the start-up condition of the range extender system is optimized, and a mode of starting the engine by ISG reverse dragging is designed, so that the range extender starts and responds faster during the start-up process, with lower fuel consumption and emissions. At the same time, the mode of starting the engine with a starter is retained to cope with emergencies, improving the stability and reliability of the overall system. Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention.

[0038] Figure 1 It is a schematic structural diagram of an amphibious heavy-duty hybrid power equipment vehicle.

[0039] Figure 2 It is a framework diagram of a start-stop control method for a multi-mode adaptive amphibious vehicle range extender system.

[0040] Figure 3 It is a framework diagram of the start signal output logic of the range extender in the on-land working mode.

[0041] Figure 4 It is a framework diagram of the start signal output logic of the range extender in the water working mode.

[0042] Figure 5 It is a framework diagram of the start signal output logic of the range extender in the up-and-down beach ship mode.

[0043] Figure 6 It is a flow chart of the start and stop of the range extender.

[0044] Figure 7 It is a flow chart of the starter emergency start mode.

[0045] Figure 8 It is a flow chart of the ISG reverse drag engine start mode. Detailed Embodiments

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] As Figure 1 shown in the structural schematic diagram of an amphibious heavy-duty hybrid vehicle. Its main components include an engine, a clutch, an ISG motor, a high-voltage distribution box, a power battery, a drive motor, a hub motor, a transfer case, a wet clutch, a jet pump, etc. As the power module of the whole vehicle, the control system of the range extender needs to respond to the commands of the whole vehicle in real time for mode switching and give feedback. The start-stop control method of the multi-mode adaptive amphibious vehicle range extender system designed for amphibious heavy-duty hybrid vehicles according to the present invention can adaptively switch to different working modes of the whole vehicle according to the driving conditions, and judge whether the range extender needs to participate in the work, combined with the operation information of the driver, so as to adjust the range extender to the corresponding working conditions.

[0048] Please refer to Figure 2 , the embodiment of the present invention provides a start-stop control method for a multi-mode adaptive amphibious vehicle range extender system, and the method includes:

[0049] Switch to the corresponding working mode according to the driving environment of the vehicle, and the range extender system adaptively adjusts to the power generation working condition or the stop working condition according to the different working modes;

[0050] Start-stop control of the range extender system, which includes a range extender starting module and a range extender stopping module. Among them, in the range extender starting module, when the fault level judgment module judges that there are no major faults affecting the driving function of the whole vehicle, the high-voltage power-on is completed, and the whole vehicle sends out an engine start request signal and there is no engine stop command, then it can enter the engine start module;

[0051] Please refer to Figure 6 , the engine start module is further divided into a starter emergency start mode and an ISG reverse-dragging engine start mode; the main difference between the two lies in whether the driver presses the emergency start switch. When the driver presses the emergency start switch, it enters the starter emergency start mode, and when the emergency start switch is closed and the fault level judgment module outputs a signal allowing the ISG to reverse-drag and start the engine, and the battery normally supplies power to the ISG, then it can enter the ISG reverse-dragging engine start mode.

[0052] In this embodiment, in the step of switching to the corresponding working mode according to the driving environment of the vehicle, and the range extender system adaptively adjusts to the power generation working condition or the stop working condition:

[0053] The working modes include an on-land working mode, an on-water working mode and a mode of getting on and off the beach ship:

[0054] After the vehicle's ACC gear is turned on, it will enter the state selection stage; when the onshore working mode switch is activated, the vehicle will enter the onshore working mode; if the vehicle is about to enter the water, the beach landing ship mode switch should be activated, and at this time the vehicle will switch from the onshore working mode to the beach landing ship mode; after the vehicle successfully enters the water surface, the water working mode switch is activated again, and the vehicle will switch to the water working mode; these three main working modes can be further subdivided according to the states of each component. According to the differences in various driving conditions and driving requirements, the range extender will adaptively enter the power generation working condition or the shutdown working condition in each working mode.

[0055] Please refer to Figure 3 , in this embodiment, the onshore working mode can be divided into a parking charging mode, an energy recovery mode, a silent driving mode, a pure electric driving mode, a pure fuel navigation mode, a power generation driving mode, and a hybrid driving mode; among them, the parking charging mode, the pure fuel navigation mode, the power generation driving mode, and the hybrid driving mode require the range extender to start and enter the power generation working condition. After the judgment of the vehicle's overall working mode is completed, a start command will be output to the range extender system:

[0056] If the overall vehicle demand power is 0 and the vehicle speed is less than the parking set vehicle speed, then the SOC will be judged. When the battery SOC is less than the set value, the vehicle will enter the parking charging mode;

[0057] If the overall vehicle demand power is not 0 and the vehicle speed is greater than the set vehicle speed, then the demand power will be judged; if the maximum power of the engine is greater than the vehicle demand power, then it will be judged whether the battery SOC is greater than the set SOC. If it is greater, the vehicle will enter the pure fuel navigation mode, and if it is less, the vehicle will enter the power generation driving mode; if the maximum power of the engine is less than the vehicle demand power, the vehicle will enter the hybrid driving mode.

[0058] Please refer to Figure 4 , in this embodiment, the water working mode: after the vehicle enters the water working mode, the system will first detect the silent mode switch. If the switch is turned on and the battery SOC is less than the set value, it will be judged together with the situation where the pure electric silent switch is not turned on whether the hybrid mode switch is turned on;

[0059] If the hybrid mode switch is turned on, then it will continue to judge whether the battery SOC is greater than the set value; if it is greater than the set value, the vehicle will enter the hybrid mode, and if it is less than the set value, it will be judged together with the situation where the hybrid mode switch is not turned on the size of the demand power and the maximum power of the engine;

[0060] If the maximum power of the engine is greater than the demand power, then it will continue to judge whether the battery SOC is greater than the set value. If it is less than the set value, the vehicle will enter the power generation navigation mode, and if it is greater than the set value, the vehicle will enter the pure fuel navigation mode;

[0061] If the maximum power of the engine is less than the required power, the vehicle enters the hybrid navigation mode;

[0062] Among them, in the power generation navigation mode, pure fuel navigation mode, and hybrid navigation mode, the range extender will adapt to the requirements of the working mode and start.

[0063] Please refer to Figure 5 , in this embodiment, the up and down beach ship mode: when the vehicle selects the up and down beach ship mode, the system will evaluate whether the maximum output power of the engine is greater than the vehicle's total demand power. If the engine output power is greater than the vehicle's total demand power, the vehicle enters the pure fuel beach landing mode; otherwise, the vehicle enters the hybrid beach landing mode; in both modes, a range extender start signal will be output to keep the range extender running.

[0064] Please refer to Figure 7 , in this embodiment, the starter emergency start mode: after entering the starter emergency start mode, the VCU requests the ISG to enter the idle speed. When the key is turned to the Start gear position, the VCU outputs a starting request switch signal to the ECU to control the starter relay to engage and start the engine, using speed control; then the VCU controls the ISG speed to synchronize with the engine. After the difference between the ISG speed and the engine speed is within the calibrated range, the VCU outputs a signal to the hydraulic controller to control the clutch to engage; after the clutch confirms engagement, the ISG is adjusted to the active discharge mode and no longer receives the speed control command.

[0065] Please refer to Figure 8 , in this embodiment, the ISG reverse drag engine start mode: after entering the ISG reverse drag engine start mode, first, the VCU requests the ISG motor torque mode to output and enters the low-speed state, with a speed control of about 300 revolutions per minute; after the difference between the ISG speed and the engine speed is within the calibrated range, the VCU outputs a signal to the hydraulic controller to control the clutch to engage; according to the fluctuation of the ISG torque, it is judged whether the ISG is engaged. When the clutch confirms engagement, the ISG speed automatically increases gradually to drag the engine into the idle speed, about 700 revolutions per minute; when the engine speed reaches the starting speed condition, the engine starts and uses speed control to switch the ISG motor from the drive mode to the power generation mode.

[0066] As a further technical solution of the present invention, in the range extender shutdown module, when the fuel level is lower than the minimum fuel level threshold, the vehicle is in the parking charging state, the vehicle Ready signal is 0, or there is a major fault in the drive component that affects the vehicle's driving function, the vehicle will send a request to stop the engine signal; if the engine start request signal is 0 or the engine request to stop signal is 1, then at this time the range extender will enter the shutdown module;

[0067] After entering the shutdown module, the VCU outputs a signal to disconnect the ISG clutch. After the clutch is confirmed to be disconnected, the VCU requests the ISG to enter the drive mode to supply power to the battery. The battery powers the accessory system and requests the engine to shut down.

[0068] When the range extender shutdown is completed, it will re-enter the initialization state.

[0069] It should be noted that in this article, the term "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or system including that element.

[0070] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are equally included in the patent protection scope of the present invention.

Claims

1. A start-stop control method for a range extender system of a multi-mode adaptive amphibious vehicle, characterized in that, The method includes: Switching to the corresponding working mode according to the driving environment of the vehicle, and the range extender system adaptively adjusts to the power generation condition or the stop condition according to different working modes; Start-stop control of the range extender system, which includes a range extender starting module and a range extender stopping module. Among them, in the range extender starting module, when the fault level judgment module determines that there are no major faults affecting the vehicle driving function, the high-voltage power-on is completed, the vehicle sends an engine start request signal and there is no engine stop command, then it can enter the engine start module; The engine start module is further divided into a starter emergency start mode and an ISG reverse-towing engine start mode; the main difference between the two is whether the driver presses the emergency start switch. When the driver presses the emergency start switch, it enters the starter emergency start mode, and when the emergency start switch is closed and there is a signal allowing the ISG to reverse-tow and start the engine output by the fault level judgment module, and the battery normally supplies power to the ISG, then it can enter the ISG reverse-towing engine start mode; The working modes include a land working mode, a water working mode, and a beach-landing ship mode: Beach-landing ship mode: After the vehicle selects the beach-landing ship mode, the system will evaluate whether the maximum power output of the engine is greater than the vehicle demand power. If the engine output power is greater than the vehicle demand power, the vehicle will enter the pure fuel beach-landing mode; otherwise, the vehicle will enter the hybrid beach-landing mode; in both modes, a range extender start signal will be output to keep the range extender in the running state.

2. The start-stop control method for a range extender system of a multi-mode adaptive amphibious vehicle according to claim 1, characterized in that, In the step of switching to the corresponding working mode according to the driving environment of the vehicle, and the range extender system adaptively adjusts to the power generation condition or the stop condition according to different working modes: The working modes include a land working mode, a water working mode, and a beach-landing ship mode: After the vehicle's ACC gear is turned on, it will enter the state selection stage; when the land working mode switch is activated, the vehicle will enter the land working mode; if the vehicle is about to enter the water, the beach-landing ship mode switch should be activated, and at this time the vehicle will switch from the land working mode to the beach-landing ship mode; after the vehicle successfully enters the water surface, then activate the water working mode switch, and the vehicle will switch to the water working mode; these three working modes are further subdivided according to the states of each component. According to the differences in various driving conditions and driving requirements, the range extender will adaptively enter the power generation condition or the stop condition for each working mode.

3. A start-stop control method for a range extender system of a multi-mode adaptive amphibious vehicle according to claim 2, characterized in that The land working mode is divided into a parking charging mode, an energy recovery mode, a silent driving mode, a pure electric driving mode, a pure fuel sailing mode, a power generation driving mode, and a hybrid driving mode; among them, the parking charging mode, the pure fuel sailing mode, the power generation driving mode, and the hybrid driving mode require the range extender to start and enter the power generation condition. After the vehicle working mode judgment is completed, a start command will be output to the range extender system: If the vehicle demand power is 0 and the vehicle speed is less than the parking set speed, then the SOC judgment will be performed. When the battery SOC is less than the set value, the vehicle will enter the parking charging mode; If the required power of the whole vehicle is not 0 and the vehicle speed is greater than the set vehicle speed, the required power will be judged; if the maximum power of the engine is greater than the required power of the vehicle, it will be judged whether the battery SOC is greater than the set SOC. If it is greater, the vehicle will enter the pure fuel navigation mode; if it is less, the vehicle will enter the power generation driving mode; if the maximum power of the engine is less than the required power of the vehicle, the vehicle will enter the hybrid driving mode.

4. The start-stop control method for the range extender system of a multi-mode adaptive amphibious vehicle according to claim 2, characterized in that, Water working mode: After the vehicle enters the water working mode, the system will first detect the switch of the silent mode. If the switch is turned on and the battery SOC is less than the set value, it will be judged together with the case where the pure electric silent switch is not turned on whether the hybrid mode switch is turned on; If the hybrid mode switch is turned on, it will continue to judge whether the battery SOC is greater than the set value; if it is greater than the set value, the vehicle will enter the hybrid mode; if it is less than the set value, it will be judged together with the case where the hybrid mode switch is not turned on the size of the required power and the maximum power of the engine; If the maximum power of the engine is greater than the required power, it will continue to judge whether the battery SOC is greater than the set value. If it is less than the set value, the vehicle will enter the power generation navigation mode; if it is greater than the set value, the vehicle will enter the pure fuel navigation mode; If the maximum power of the engine is less than the required power, the vehicle will enter the hybrid navigation mode; Among them, in the power generation navigation mode, pure fuel navigation mode, and hybrid navigation mode, the range extender will adapt to the requirements of this working mode and start.

5. A start-stop control method for a range extender system of a multi-mode adaptive amphibious vehicle according to claim 1, characterized in that, Starter emergency start mode: After entering the starter emergency start mode, the VCU requests the ISG to enter the idle speed. When the key is turned to the Start gear, the VCU outputs a start request switch signal to the ECU to control the starter relay to engage and start the engine, using speed control; then the VCU controls the ISG speed to synchronize with the engine. After the difference between the ISG speed and the engine speed is within the calibrated range, the VCU outputs a signal to the hydraulic controller to control the clutch to engage; after the clutch confirms engagement, the ISG is adjusted to the active discharge mode and no longer receives the speed control instruction.

6. The start-stop control method for the range extender system of a multi-mode adaptive amphibious vehicle according to claim 1, characterized in that, ISG reverse-drag engine start mode: After entering the ISG reverse-drag engine start mode, first, the VCU requests the ISG motor torque mode output and enters the low-speed state; after the difference between the ISG speed and the engine speed is within the calibrated range, the VCU outputs a signal to the hydraulic controller to control the clutch to engage; judge whether the ISG is engaged according to the fluctuation of the ISG torque. When the clutch confirms engagement, the ISG speed automatically increases step by step to drag the engine into the idle speed; when the engine speed reaches the starting speed condition, the engine starts and uses speed control to switch the ISG motor from the drive mode to the power generation mode.

7. A start-stop control method for a range extender system of a multi-mode adaptive amphibious vehicle according to claim 1, characterized in that, In the range extender shutdown module, when the fuel level is lower than the minimum fuel level threshold, the whole vehicle is in the parking charging state, the whole vehicle Ready signal is 0, or there is a major fault in the drive component that affects the normal driving function of the whole vehicle, the whole vehicle will send a request engine shutdown signal; if the engine start request signal is 0 or the engine request shutdown signal is 1, then at this time the range extender will enter the shutdown module; After entering the shutdown module, the VCU outputs a signal to disconnect the ISG clutch. After the clutch is confirmed to be disconnected, the VCU requests the ISG to enter the drive mode to supply power to the battery. The battery supplies power to the accessory system and requests the engine to shut down; After the range extender has completed shutdown, it will re-enter the initialization state.

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