A universal range extender electronic control device and control method thereof

Abstract

The present invention discloses a universal range extender electronic control device and a control method thereof, belonging to the technical field of new energy electric vehicles, including an MCU for data processing, an EEPROM for storing data, a CAN drive module for data communication, a programmable driver, a power conversion chip, an intelligent power switch and an aviation plug; the control method includes: switching from standby mode to the starting process; after successful starting, entering the idle mode; the range extender is forced to idle in normal mode, when the range extender electronic control device receives a power generation instruction from a host computer, it enters the power generation mode; after the range extender electronic control device receives a shutdown instruction, it enters the shutdown process. The present invention coordinates and controls the diesel engine controller, the generator controller and the cooling controller according to the user's high-voltage power demand, so that the range extender works at the optimal efficiency operating point.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy electric vehicles, and in particular to a universal range extender electronic control device and a control method thereof. Background Art

[0002] The diesel engine range extender system mainly consists of three parts: the diesel engine unit, the generator unit and the auxiliary cooling unit. The diesel engine unit, the generator unit and the auxiliary cooling unit have corresponding separate controllers, which constitute the internal control system of the diesel engine range extender, and exchange information and realize functions with external end users separately. The diesel engine controller receives the user's speed requirements and performs speed control output of the range extender; the generator controller receives the user's torque requirements and performs torque control output of the range extender; the auxiliary cooling controller controls the operation of the range extender cooling fan and water pump according to the operating status of the range extender, and a large amount of information is transmitted in real time between the three controllers and the user.

[0003] However, the diesel engine range extender system in the prior art has the following problems:

[0004] 1. The user needs to edit and define the information that needs to be interacted with the three controllers separately, resulting in excessive information load;

[0005] 2. Due to the lack of coordinated control between the various units, the generator and diesel engine in the range extender cannot operate in the high-efficiency zone, and thus cannot give full play to the fuel consumption advantage of the range extender hybrid power over the traditional fuel power;

[0006] 3. Due to the lack of universal range extender electronic control devices, when the manufacturer or model of any controller in the range extender's diesel engine unit, generator unit and auxiliary cooling unit is changed, the user needs to re-edit the definition information and correct the data, and the universal substitution is poor;

[0007] 4. Electromagnetic interference generated by other user equipment such as high-voltage power supplies can easily cause abnormal operation of the internal controller of the range extender system;

[0008] 5. Since the auxiliary cooling system is controlled by a separate controller and lacks coordinated control with the range extender system, the cooling effect of the range extender is poor. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide a universal range extender electronic control device and a control method thereof, which can reduce the information load rate and enable the range extender to operate in an energy-saving and high-efficiency area.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0011] A universal range extender electronic control device, including an MCU for data processing, an EEPROM for storing data, a CAN drive module for data communication, a programmable driver, a power conversion chip, an intelligent power switch and an aviation plug;

[0012] The range extender electronic control device screens and processes information sent by the diesel engine controller, the generator controller and the auxiliary cooling controller, and coordinates and controls the diesel engine controller, the generator controller and the cooling controller according to the user's high-voltage power demand, so that the range extender operates at the optimal efficiency operating point.

[0013] Further improvements to the technical solution of the present invention are: the range extender electronic control device is connected to the diesel engine controller, the generator controller and the host computer respectively through the CAN drive module; the auxiliary cooling controller is connected through the intelligent power switch; and the engine water temperature and the generator water temperature are collected through the analog interface of the MCU.

[0014] A control method for a universal range extender comprises the following steps:

[0015] S1, switching from standby mode to starting process;

[0016] S2. After successful starting, the engine enters the idle mode, in which the generator torque is zero;

[0017] S3, the range extender is forced to idle in normal mode. When the range extender electronic control device receives the power generation command from the host computer, it enters the power generation mode;

[0018] S4: After receiving the shutdown command, the range extender electronic control device enters the shutdown process.

[0019] A further improvement of the technical solution of the present invention is that: S1 includes the following steps:

[0020] When S1.1 is in standby mode, the range extender electronic control device enters the starting process after receiving the starting command from the host computer;

[0021] S1.2 The range extender electronic control device sends a command to start the generator to drive the engine. During the starting process, the generator is an electric motor and is set to torque mode. It drives the engine to rotate at 500Nm and drives the engine to reach the target speed of 700r / min within 15s. When the target speed is reached, it is maintained for 3s and then the generator torque is removed;

[0022] S1.3 The engine runs at an idle speed of 680r / min and maintains running for 15s without shutting down, which is considered a successful start. If the engine speed continues to drop until it stops after the generator torque is removed, it is considered a failed start and the engine will re-enter the standby mode.

[0023] S1.4 If the start fails, wait for 30 seconds before restarting the start process; the host computer sends a start command, allowing the range extender to start three times in succession. If the three starts fail, the range extender electronic control device reports a start failure and no longer executes the start command.

[0024] A further improvement of the technical solution of the present invention is that: S2 includes the following steps:

[0025] S2.1 When the engine water temperature of the range extender is too low, the range extender is forced to idle in the intermediate transition mode;

[0026] In the intermediate transition mode, when T water temperature ≤ -25℃, N = 700r / min, keep for 3min; when -25℃<T water temperature ≤ 5℃, N = 700r / min, keep for 2min; when 5℃<T water temperature ≤ 40℃, N = 700r / min, keep for 1min; when T water temperature > 40℃, enter the normal idle mode; T water temperature is the engine water temperature of the range extender, and N is the idle speed;

[0027] S2.2 When the engine water temperature of the range extender is greater than 40°C, the range extender is forced to idle in normal mode; when the range extender electronic control device receives the power generation command from the host computer, it enters the power generation mode.

[0028] A further improvement of the technical solution of the present invention is that: S3 includes the following steps:

[0029] S3.1 After receiving the power demand sent by the host computer, the range extender electronic control device determines the actual target power of the engine according to the target power and the engine water temperature of the range extender;

[0030] Calculate the target power limit. When the engine water temperature Twater temperature ≥ -10°C, the target power limit is equal to the target power. When -25°C ≤ Twater temperature < -10°C, the target power limit is 100kW. When Twater temperature ≤ -25°C, the target power limit is 50kW.

[0031] If the actual target power is greater than the target power limit, the actual target power is set to the target power limit;

[0032] S3.2 calculates the target speed and target torque of the operating point corresponding to the actual target power;

[0033] Calculate the speed range [n1, n2] of the operating point corresponding to the actual target power, where n1 is the minimum speed of the corresponding operating point and n2 is the maximum speed of the corresponding operating point;

[0034] When the engine speed is less than n1, the target engine speed is increased to n1;

[0035] When the engine speed is within the speed range, the target engine speed is maintained unchanged;

[0036] When the engine speed is greater than n2, the target engine speed is reduced to n2;

[0037] Calculate the target torque of the generator corresponding to the current target engine speed under the target power;

[0038] S3.3 sends a target speed to the engine controller, and sends an enable command and a target torque command to the generator controller; the engine controller and the generator controller respectively control the engine and the generator to operate at the target operating point.

[0039] A further improvement of the technical solution of the present invention is that: S4 includes the following steps:

[0040] S4.1 When receiving the emergency stop command, the range extender electronic control device directly sends a torque reset command to the generator controller and a stop command to the engine controller, so that the range extender system quickly enters the stop mode;

[0041] S4.2 When a normal shutdown command is received, the controller gradually reduces the power unit output power according to the power regulation path with the best fuel economy during the power reduction process until the idle mode is reached. The engine is reduced to idle speed and shuts down after continuing to run for 60 seconds.

[0042] A further improvement of the technical solution of the present invention is that the switching rules of the mode and process include:

[0043] R1. The standby mode can only be switched to the starting process. If the starting process is normal, it will automatically enter the idle mode.

[0044] R2, in idle mode, enters the power generation process or reverse power consumption process based on the control command;

[0045] R3. All control states can be triggered by a shutdown command or a specific level of fault status and transferred to the shutdown process;

[0046] R4. The reverse power consumption process and the power generation process cannot be switched directly, and the switching must go through the idle state.

[0047] A further improvement of the technical solution of the present invention is that it also includes cooling control:

[0048] When the range extender engine water temperature or the generator water temperature rises to the lower limit of the water temperature alarm, the fans will start in sequence, and stop working when the temperature drops to 2°C below the lower limit; when the water temperature continues to rise, the fan speed and the water temperature continue to rise; when the engine water temperature or the generator water temperature reaches the upper limit, the electronic fan speed reaches 100%; when the water temperature signal is lost, the fan runs at full speed.

[0049] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0050] 1. The present invention has control logic inside the range extender electronic control device, and can seek the optimal efficiency operating point of the range extender according to the user's high-voltage power demand, thereby making the range extender operate in an energy-saving and high-efficiency area.

[0051] 2. The present invention has a standard data interface and uses a standard protocol to exchange information with the user, thereby realizing that any controller in the diesel engine unit, generator unit and auxiliary cooling unit inside the range extender can be replaced.

[0052] 3. In the present invention, the controllers of the diesel engine unit, the generator unit and the auxiliary cooling unit inside the range extender send information which is screened and processed by the range extender electronic control device before interacting with the user, thereby reducing the information load rate.

[0053] 4. The range extender electronic control device of the present invention integrates auxiliary cooling system control and performs cooling adjustment according to the working state of the range extender system, thereby reducing factors that reduce the efficiency of the range extender system due to unfavorable heat dissipation and improving the efficiency of the cooling system.

[0054] 5. In the present invention, the information module and the power module of the range extender electronic control device adopt isolation technology to achieve electromagnetic interference protection for the information module, thereby ensuring the reliable operation of the range extender system. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a circuit diagram of the electronic control device of the range extender in the present invention;

[0056] Figure 2 It is the electrical wiring diagram of the range extender electronic control device in the present invention;

[0057] Figure 3 It is a state switching flow chart of the range extender electronic control device in the present invention;

[0058] Figure 4 It is a logic flow chart of the standby mode and the starting process in the present invention;

[0059] Figure 5 It is the logic flow chart of the idle mode in the present invention;

[0060] Figure 6 It is a logic flow chart of the power generation process in the present invention;

[0061] Figure 7 It is a logic flow chart of the shutdown process in the present invention;

[0062] Among them, 1. range extender electronic controller, 2. engine controller, 3. generator controller, 4. host computer, 5. electronic water pump motor, 6. electronic fan motor, 7. engine water temperature sensor, 8. generator water temperature sensor. DETAILED DESCRIPTION

[0063] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0064] like Figure 1 As shown, a universal range extender electronic control device includes an MCU for data processing, an EEPROM for storing data, a CAN drive module for data communication, a programmable driver, a power conversion chip, an intelligent power switch and an aviation plug;

[0065] The range extender electronic control device screens and processes information sent by the diesel engine controller, the generator controller and the auxiliary cooling controller, and coordinates and controls the diesel engine controller, the generator controller and the cooling controller according to the user's high-voltage power demand, so that the range extender operates at the optimal efficiency operating point.

[0066] like Figure 2 As shown, the universal range extender electronic control device is connected to the diesel engine controller, generator controller and host computer through the CAN driver module; connected to the auxiliary cooling controller through the intelligent power switch; and the engine water temperature and generator water temperature are collected through the analog interface of the MCU;

[0067] The diesel engine controller includes an analog signal acquisition module, a signal driving module, a pulse signal capture module, a CAN communication module, a storage unit and a fault diagnosis module;

[0068] The generator controller includes a data processing chip, a current sampling module, a position feedback module, a transformation module, a PI control module and a SVPWM module;

[0069] The auxiliary cooling controller includes a data processor, an analog signal acquisition module, a switch signal output module and a CAN communication module;

[0070] The auxiliary cooling controller controls the electronic water pump motor and the electronic fan motor;

[0071] The engine water temperature and the generator water temperature are collected by an engine water temperature sensor and a generator water temperature sensor respectively.

[0072] In a universal control method for a range extender, the control state includes:

[0073] Standby mode: After the range extender is powered on, all controllers are powered on, but the diesel engine is not started. At this time, the speed of the diesel engine and generator is 0.

[0074] Starting process: In this mode, the generator is an electric motor, and under a specific torque mode, the generator drives the diesel engine to start and operate.

[0075] Idle mode: The diesel engine starts successfully and automatically enters the speed of 700r / min. The speed is always maintained at 700r / min without other operations.

[0076] Power generation process: After the host computer sends a power demand signal, the engine controller and generator controller control the engine and generator to operate at the target operating point respectively.

[0077] Shutdown process: After the range extender electronic control device receives the shutdown command, the generator controller sends a torque reset command and a shutdown command to the engine controller, eventually making the diesel engine and generator speed zero and stop working.

[0078] Reverse drag power consumption process: When the diesel engine power is insufficient or interrupted, in order to maintain the normal operation of the system, the generator absorbs electricity and acts as an electric motor to drag the system to work.

[0079] like Figure 3 As shown, the switching rules between modes and processes include:

[0080] R1. The standby mode can only be switched to the starting process. If the starting process is normal, it will automatically enter the idle mode.

[0081] R2, in idle mode, enters the power generation process or reverse power consumption process based on the control command;

[0082] R3. All control states can be triggered by a shutdown command or a specific level of fault status and transferred to the shutdown process;

[0083] R4. The reverse power consumption process and the power generation process cannot be switched directly, and the switching must go through the idle state.

[0084] A control method for a universal range extender comprises the following steps:

[0085] S1, switching from standby mode to starting process; Figure 4 As shown, the specific steps include:

[0086] When S1.1 is in standby mode, the range extender electronic control device enters the starting process after receiving the starting command from the host computer;

[0087] S1.2 The range extender electronic control device sends a command to start the engine by driving the generator. During the starting process, the generator is an electric motor and is set to torque mode. It drives the engine to rotate at 500Nm (the torque direction is consistent with the engine running direction). The engine is driven to reach the target speed of 700r / min within 15s. When the target speed is reached, it is maintained for 3s and then the generator torque is removed;

[0088] S1.3 The engine runs at an idle speed of 680r / min and maintains running for 15s without shutting down, which is considered a successful start. If the engine speed continues to drop until it stops after the generator torque is removed, it is considered a failed start and the engine will re-enter the standby mode.

[0089] S1.4 If the start fails, wait for 30 seconds before restarting the start process; the host computer sends a start command, allowing the range extender to start three times in succession. If the three starts fail, the range extender electronic control device reports a start failure and no longer executes the start command.

[0090] S2. After starting successfully, enter the idle mode, in which the generator torque is zero; Figure 5 As shown, the following steps are included:

[0091] S2.1 When the engine water temperature of the range extender is too low, the range extender is forced to idle in the intermediate transition mode;

[0092] In the intermediate transition mode, when T 水温 ≤-25℃, N=700r / min, maintain for 3min; when -25℃<T 水温 ≤5℃, N=700r / min, maintain for 2min; 5℃<T 水温 ≤40℃, N=700r / min, maintain for 1min; when T 水温 >40℃, it enters normal idle mode; T 水温 is the engine water temperature of the range extender, and N is the idle speed.

[0093] S2.2 When the engine water temperature of the range extender is greater than 40°C, the range extender is forced to idle in normal mode; when the range extender electronic control device receives the power generation command from the host computer, it enters the power generation mode;

[0094] In normal mode, the engine operates at a given idle speed of 1400r / min.

[0095] S3, range extender forced idling In normal mode, when the range extender electronic control device receives the power generation command from the host computer, it enters the power generation mode; Figure 6 As shown, the following steps are included:

[0096] S3.1 After receiving the power demand sent by the host computer, the range extender electronic control device determines the actual target power of the engine according to the target power and the engine water temperature of the range extender;

[0097] Calculate the target power limit when the engine water temperature T 水温 ≥-10℃, the target power limit is equal to the target power; when -25℃≤T 水温 When the temperature is lower than -10℃, the target power limit is 100kW; when T 水温 When the temperature is ≤-25℃, the target power limit is 50kW;

[0098] If the actual target power is greater than the target power limit, the actual target power is set to the target power limit;

[0099] S3.2 calculates the target speed and target torque of the operating point corresponding to the actual target power;

[0100] Calculate the speed range [n1, n2] of the operating point corresponding to the actual target power, where n1 is the minimum speed of the corresponding operating point and n2 is the maximum speed of the corresponding operating point;

[0101] When the engine speed is less than n1, the target engine speed is increased to n1;

[0102] When the engine speed is within the speed range, the target engine speed is maintained unchanged;

[0103] When the engine speed is greater than n2, the target engine speed is reduced to n2;

[0104] Calculate the target torque of the generator corresponding to the current target engine speed under the target power.

[0105] S3.3 sends a target speed to the engine controller, and sends an enable command and a target torque command to the generator controller; the engine controller and the generator controller respectively control the engine and the generator to operate at the target operating point.

[0106] S4: After receiving the shutdown command, the range extender electronic control device enters the shutdown process; Figure 7 As shown, the specific steps include:

[0107] The shutdown command includes the emergency shutdown command and the normal shutdown command;

[0108] S4.1 When receiving an emergency stop command, the range extender electronic control device directly sends a torque reset command to the generator controller and a stop command to the engine controller, so that the range extender system quickly enters the stop mode.

[0109] S4.2 When a normal shutdown command is received, the controller gradually reduces the power unit output power according to the power regulation path with the best fuel economy during the power reduction process until the idle mode is reached. The engine is reduced to idle speed and shuts down after continuing to run for 60 seconds.

[0110] A control method for a universal range extender, further comprising cooling control;

[0111] When the range extender engine water temperature or the generator water temperature rises to the lower limit of the water temperature alarm, the 10 fans will start in sequence and work at a speed of 15%. When the temperature drops to 2°C below the lower limit, they will stop working. When the water temperature continues to rise, the speed of the 10 fans will continue to rise with the water temperature. When the engine water temperature or the generator water temperature reaches the upper limit, the speed of the electronic fan reaches 100%. When the water temperature signal is lost, the fan will run at full speed.

[0112] Example

[0113] The PCB board inside the range extender electronic control device is fixed to the housing by six bolts, and the housing and cover are slotted and filled with conductive sealing strips. The main electronic component patches of the PCB board are shown in Table 1, and the connector is two aviation plugs, and the plug models are shown in Table 2. One of the plugs is used to connect the power line, and the other is used to connect the CAN line, analog signal line, and drive control line.

[0114] Table 1 Main electronic components

[0115] Serial number name model quantity 1 MCU MPC5554MVR132 3 2 EEPROM M95640-RAN3 3 3 CAN Driver TJA1050 6 4 Programmable Driver MC33PT2000AF 6 5 Power conversion chip LED5A2455WJ 20 6 Intelligent Power Switch IPS7091SPbF 12 7 Aviation plug J599 / 20FG35PLN 2

[0116] Table 2 Plug Model

[0117] Serial number model quantity 1 XCB30F30ZD1W 1 2 XCB30F30ZD1 1

[0118] Working principle:

[0119] The universal range extender electronic control device has a standard data interface and adopts a standard protocol for information exchange with the user, so that any controller in the diesel engine unit, generator unit and auxiliary cooling unit inside the range extender can be replaced; the controllers of the diesel engine unit, generator unit and auxiliary cooling unit inside the range extender send information that is screened and processed by the range extender electronic control device before interacting with the user, which can reduce the information load rate; there is control logic inside the range extender electronic control device, which can seek the optimal efficiency operating point of the range extender based on the user's high-voltage power demand, so as to make the range extender operate in the energy-saving and high-efficiency area; the information module and the power module of the range extender electronic control device adopt isolation technology to achieve electromagnetic interference protection for the information module, thereby ensuring the reliable operation of the range extender system; the range extender electronic control device integrates auxiliary cooling system control, and adjusts cooling according to the working status of the range extender system, reducing the factors that reduce the efficiency of the range extender system due to unfavorable heat dissipation.

[0120] In summary, the present invention can keep the range extender running in the energy-saving and high-efficiency zone; realize the replaceability of controllers in the diesel engine unit, generator unit and auxiliary cooling unit inside the range extender; reduce the vehicle information load rate; improve the working stability of the electronic system of the range extender; integrate cooling control and improve the efficiency of the cooling system.

Claims

1. A universal range extender control method, characterized in that: The following steps are involved: S1, switching from standby mode to starting process; S1 includes the following steps: When S1.1 is in standby mode, the range extender electronic control device enters the starting process after receiving the starting command from the host computer; S1.2 The range extender electronic control device sends a command to start the generator to drive the engine. During the starting process, the generator is an electric motor and is set to torque mode. It drives the engine to rotate at 500Nm and drives the engine to reach the target speed of 700r / min within 15s. When the target speed is reached, it is maintained for 3s and then the generator torque is removed; S1.3 The engine runs at an idle speed of 680r / min and maintains running for 15s without shutting down, which is considered a successful start. If the engine speed continues to drop until it stops after the generator torque is removed, it is considered a failed start and the engine will re-enter the standby mode. S1.4 If the start fails, wait for 30 seconds before restarting the start process; the host computer sends a start command, allowing the range extender to start three times in succession. If the three starts fail, the range extender electronic control device reports a start failure and no longer executes the start command; S2: After successful starting, the engine enters the idle mode, in which the generator torque is zero; S3, the range extender is forced to idle in normal mode. When the range extender electronic control device receives the power generation command from the host computer, it enters the power generation mode; S4: After receiving the shutdown command, the range extender electronic control device enters the shutdown process.

2. The control method of a universal range extender according to claim 1, characterized in that: S2 includes the following steps: S2.1 When the engine water temperature of the range extender is too low, the range extender is forced to idle in the intermediate transition mode; In the intermediate transition mode, when T water temperature ≤ -25℃, N = 700r / min, keep for 3min; when -25℃<T water temperature ≤ 5℃, N = 700r / min, keep for 2min; when 5℃<T water temperature ≤ 40℃, N = 700r / min, keep for 1min; when T water temperature > 40℃, enter the normal idle mode; T water temperature is the engine water temperature of the range extender, and N is the idle speed; S2.2 When the engine water temperature of the range extender is greater than 40°C, the range extender is forced to idle in normal mode; when the range extender electronic control device receives the power generation command from the host computer, it enters the power generation mode.

3. The control method of a universal range extender according to claim 1, characterized in that: S3 includes the following steps: S3.1 After receiving the power demand sent by the host computer, the range extender electronic control device determines the actual target power of the engine according to the target power and the engine water temperature of the range extender; Calculate the target power limit. When the engine water temperature Twater temperature ≥ -10°C, the target power limit is equal to the target power. When -25°C ≤ Twater temperature < -10°C, the target power limit is 100kW. When Twater temperature ≤ -25°C, the target power limit is 50kW. If the actual target power is greater than the target power limit, the actual target power is set to the target power limit; S3.2 calculates the target speed and target torque of the operating point corresponding to the actual target power; Calculate the speed range [n1, n2] of the operating point corresponding to the actual target power, where n1 is the minimum speed of the corresponding operating point and n2 is the maximum speed of the corresponding operating point; When the engine speed is less than n1, the target engine speed is increased to n1; When the engine speed is within the speed range, the target engine speed is maintained unchanged; When the engine speed is greater than n2, the target engine speed is reduced to n2; Calculate the target torque of the generator corresponding to the current target engine speed under the target power; S3.3 sends a target speed to the engine controller, and sends an enable command and a target torque command to the generator controller; the engine controller and the generator controller respectively control the engine and the generator to operate at the target operating point.

4. The control method of a universal range extender according to claim 1, characterized in that: S4 includes the following steps: S4.1 When receiving the emergency stop command, the range extender electronic control device directly sends a torque reset command to the generator controller and a stop command to the engine controller, so that the range extender system quickly enters the stop mode; S4.2 When a normal shutdown command is received, the controller gradually reduces the power unit output power according to the power regulation path with the best fuel economy during the power reduction process until the idle mode is reached. The engine is reduced to idle speed and shuts down after continuing to run for 60 seconds.

5. The control method of a universal range extender according to claim 1, characterized in that: The switching rules between modes and processes include: R1. The standby mode can only be switched to the starting process. If the starting process is normal, it will automatically enter the idle mode. R2, in idle mode, enters the power generation process or reverse power consumption process based on the control command; R3. All control states can be triggered by a shutdown command or a specific level of fault status and transferred to the shutdown process; R4. The reverse power consumption process and the power generation process cannot be switched directly, and the switching must go through the idle state.

6. The control method of a universal range extender according to claim 1, characterized in that: Also includes cooling controls: When the range extender engine water temperature or the generator water temperature rises to the lower limit of the water temperature alarm, the fans will start in sequence, and stop working when the temperature drops to 2°C below the lower limit; when the water temperature continues to rise, the fan speed and the water temperature continue to rise; when the engine water temperature or the generator water temperature reaches the upper limit, the electronic fan speed reaches 100%; When the water temperature signal is lost, the fan runs at full speed.

7. A universal range extender electronic control device, characterized in that: The control method of the universal range extender according to any one of claims 1 to 6 is applied, comprising an MCU for data processing, an EEPROM for storing data, a CAN drive module for data communication, a programmable driver, a power conversion chip, an intelligent power switch and an aviation plug; The range extender electronic control device screens and processes information sent by the diesel engine controller, the generator controller and the auxiliary cooling controller, and coordinates and controls the diesel engine controller, the generator controller and the cooling controller according to the user's high-voltage power demand, so that the range extender operates at the optimal efficiency operating point.

8. The universal range extender electronic control device according to claim 7, characterized in that: The range extender electronic control device is connected to the diesel engine controller, generator controller and host computer through the CAN driver module; connected to the auxiliary cooling controller through the intelligent power switch; and the engine water temperature and generator water temperature are collected through the analog interface of the MCU.

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