Power system of hybrid airport fire fighting truck and control method of power system

Abstract

The invention discloses a power system of a hybrid airport fire fighting truck and a control method of the power system, and belongs to the technical field of new energy power systems. According to the system, an engine is connected with a motor through an electromagnetic clutch, the motor is connected with the input end of a walking-water pump power distribution box, and the walking-water pump power distribution box is connected with a fire pump power takeoff and mechanically connected with a driving wheel through an integrated gear gearbox; the high-voltage distribution box is electrically connected with the motor controller, the energy storage device, the external charging device, the DCDC converter, the electric steering pump, the electric inflating pump and the electric air conditioner, and the motor controller is electrically connected with the motor; the system controller is in communication connection with an under-vehicle operation device, a cab operation device, an engine, an electromagnetic clutch, a motor controller, a high-voltage distribution box, an energy storage device, a DCDC converter, an electric steering pump, an electric blast pump, an electric air conditioner, a fire pump power takeoff, a walking-water pump power distribution box and an integrated gear gearbox. Functions are complete, operation is visual and convenient, and hybrid driving and pure electric driving can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy power systems, and more specifically, to a power system of a hybrid airport fire truck and a control method thereof. Background Art

[0002] A fire truck is a vehicle designed and manufactured specifically for firefighting. It is suitable for firefighters to ride on and is equipped with various firefighting equipment or fire extinguishing agents. It can perform tasks such as firefighting, auxiliary firefighting, firefighting and rescue, and emergency disaster relief. Fire trucks play an important role in maintaining social security, and their functions and performance are becoming more and more diversified and specialized to meet the needs of various emergencies. Therefore, as an important firefighting equipment, fire trucks play an irreplaceable role in protecting people's lives and property.

[0003] Hybrid airport fire trucks have the advantages of low fuel consumption and easy operation. However, the current hybrid airport fire trucks have problems such as incomplete functions and inconvenient operation. Summary of the invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. One purpose of the present invention is to provide a power system for a hybrid airport fire truck.

[0005] A second objective of the present invention is to provide a method for controlling the power system of a hybrid airport fire truck.

[0006] In order to achieve the above-mentioned purpose one, the present invention provides a power system of a hybrid airport fire truck, including an under-vehicle operating device, a cab operating device, a system controller, an engine, an electromagnetic clutch, a motor, a motor controller, a high-voltage distribution box, an energy storage device, an external charging device, a DCDC converter, an electric steering pump, an electric air pump, an electric air conditioner, a fire water pump power take-off, a travel-water pump power distribution box, an integrated gear gearbox, and a drive wheel;

[0007] The engine is mechanically connected to the motor through the electromagnetic clutch, the output end of the motor is mechanically connected to the input end of the travel-water pump power distribution box, the first output end of the travel-water pump power distribution box is mechanically connected to the fire water pump power take-off, and the second output end of the travel-water pump power distribution box is mechanically connected to the drive wheel through the integrated gearbox;

[0008] The high-voltage distribution box is electrically connected to the motor controller, energy storage device, external charging device, DCDC converter, electric steering pump, electric air pump, and electric air conditioner. The motor controller is electrically connected to the motor. The system controller is communicatively connected to the under-vehicle operating device, cab operating device, engine, electromagnetic clutch, motor controller, high-voltage distribution box, energy storage device, DCDC converter, electric steering pump, electric air pump, electric air conditioner, fire water pump power take-off, travel-water pump power distribution box, and integrated gear gearbox.

[0009] As a further improvement, the engine is any one of a diesel engine, a gasoline engine, a methanol engine, a hydrogen engine, and a natural gas engine.

[0010] Furthermore, the high-voltage distribution box is electrically connected to the motor controller, energy storage device, external charging device, DCDC converter, electric steering pump, electric air pump, and electric air conditioner through a high-voltage bus; the DC voltage range of the high-voltage bus is 300 to 1000V.

[0011] Furthermore, the system controller receives instructions from the under-vehicle operating device and the cab operating device, converts them into execution request signals after logical arbitration, and sends the instructions to the corresponding control components for execution.

[0012] Furthermore, after receiving the instruction from the system controller, the energy storage device performs the connection and disconnection of the high-voltage battery relay based on the instruction, and the high-voltage battery relay includes a main positive relay, a main negative relay and a pre-charge relay. The energy storage device also feeds back the connection and disconnection state of the high-voltage battery relay, the remaining power SOC value, and the fault state to the system controller;

[0013] After receiving the instructions from the system controller, the high-voltage distribution box executes the connection and disconnection of the high-voltage accessory relays based on the instructions. The high-voltage accessory relays include motor controller relays, DCDC converter relays, electric steering pump relays, electric air pump relays, and electric air conditioning relays. The high-voltage distribution box also feeds back the connection and disconnection status of the high-voltage accessory relays and the external charging status to the system controller.

[0014] Furthermore, after receiving the instruction from the system controller, the motor controller executes the enablement, control mode, torque instruction, and speed instruction of the motor controller based on the instruction, and the motor controller feeds back the actual enablement state, control mode actual state, torque actual value, speed actual value, and fault state of the motor controller to the system controller;

[0015] After receiving the command from the system controller, the engine controller executes the engine start and stop, control mode, torque command, and speed command based on the command, and the engine controller feeds back the engine start and stop actual state, control mode actual state, torque actual value, speed actual value, and fault state to the system controller;

[0016] After receiving the instruction from the system controller, the electromagnetic clutch performs engagement and disconnection of the electromagnetic clutch based on the instruction, and the electromagnetic clutch feeds back the engagement and disconnection states of the electromagnetic clutch to the system controller.

[0017] Further, after receiving the instruction from the system controller, the DCDC converter enables the DCDC converter based on the instruction, and the DCDC converter feeds back the actual enabling state, the output voltage value of the DCDC converter, and the fault state to the system controller;

[0018] After receiving the instruction from the system controller, the electric steering pump enables the electric steering pump based on the instruction, and the electric steering pump feeds back the actual enabling state, the actual speed of the steering pump, and the fault state to the system controller;

[0019] After receiving the instruction from the system controller, the electric air pump enables the electric air pump based on the instruction, and the electric air pump feeds back the actual enabling state, the actual speed of the air pump, and the fault state to the system controller;

[0020] After receiving the instruction from the system controller, the electric air conditioner enables the electric air conditioner based on the instruction, and feeds back the actual enabling state, actual outlet temperature of the air conditioner, and fault state to the system controller.

[0021] Furthermore, after receiving the instruction from the system controller, the travel-water pump power distribution box distributes power to the travel-water pump power distribution box based on the instruction, and the travel-water pump power distribution box feeds back the power distribution ratio and fault status to the system controller;

[0022] After receiving the instruction from the system controller, the fire pump power take-off performs engagement and separation of the fire pump power take-off and executes the water pump speed based on the instruction, and the fire pump power take-off feeds back the actual engagement and separation state of the fire pump power take-off, the actual water pump speed, and the fault state to the system controller;

[0023] After receiving the instruction from the system controller, the controller of the integrated gear transmission performs gear switching and target gear execution based on the instruction, and the controller of the integrated gear transmission feeds back the actual gear switching state, current gear and fault state to the system controller.

[0024] Furthermore, the system controller feeds back the system control status to the cab operating device for status display, and the displayed content includes the SOC value of the remaining power of the high-voltage battery, the vehicle speed, the power generation status, the engine operating status, the electromagnetic clutch engagement status, the travel-water pump power distribution box distribution ratio, the fire water pump power take-off operating status, the integrated gear transmission gear status, the DCDC converter operating status, the electric steering pump operating status, the electric air pump operating status, the electric air conditioner start status, and the system fault status.

[0025] In order to achieve the above-mentioned second objective, the present invention provides a control method for a power system of a hybrid airport fire truck, comprising the following steps:

[0026] Step 1. When the driver's key is powered on, the system controller communicates with the vehicle's undercarriage operating device, cab operating device, engine, electromagnetic clutch, motor controller, high-voltage distribution box, energy storage device, DCDC converter, electric steering pump, electric air pump, electric air conditioner, fire pump power take-off, travel-water pump power distribution box, and integrated gear transmission, and ensures normal communication;

[0027] Step 2. The system controller collects the working status information of each control component; if there is no fault information, the system controller controls the energy storage device to perform high-voltage power-on operation; if there is fault information, the system controller limits the corresponding function according to the fault level limit;

[0028] Step 3. If the high voltage power-on is completed normally and the system has no faults, the system controller enters the system mode detection, and the system mode includes pure electric mode and hybrid mode;

[0029] Step 4. If the system mode detects the pure electric mode, if the SOC value is greater than the calibration threshold value A%, the system enters the pure electric mode activation state, and the corresponding motor is enabled, the DCDC converter is enabled, the electric steering pump is enabled, the electric air pump is enabled, and the electric air conditioner is enabled; based on the operating instructions of the cab operating device or the operating instructions of the under-vehicle operating device, the operating conditions of pure electric driving, driving water extraction, and parking water extraction are selected, and the corresponding fire pump power take-off is combined and separated, and the travel-water pump power distribution box performs power distribution actions; based on the operating instructions of the cab operating device or the operating instructions of the under-vehicle operating device, the speed of the fire pump can be increased or decreased to achieve changes in the water output and water output height of the fire pump; during the pure electric operation, the SOC value will decrease, and when the SOC value is less than the calibration threshold value B%, the system automatically switches from the pure electric mode to the hybrid mode;

[0030] Step 5. If the system mode detects the pure electric mode and the SOC value is not greater than the calibration threshold value A%, the system directly enters the hybrid mode activation state;

[0031] Step 6. If the system mode detects the hybrid mode, the system enters the hybrid mode activation state, and correspondingly executes the engine start and operation, the electromagnetic clutch engagement, the motor enablement operation, and then the DCDC converter enablement operation, the electric steering pump enablement operation, the electric air pump enablement operation, and the electric air conditioner enablement; based on the operating instructions of the cab operating device or the operating instructions of the under-vehicle operating device, the operating conditions of hybrid driving, driving water extraction, and parking water extraction are selected, and the corresponding fire water pump power take-off engagement and separation actions are executed, and the travel-water pump power distribution box performs power distribution actions; based on the operating instructions of the cab operating device or the operating instructions of the under-vehicle operating device, the fire water pump speed can be increased or decreased to achieve changes in the water output and water output height of the fire water pump.

[0032] Step 7. If the system detects that the vehicle is in parking state and detects that the driver's key is powered off, the system controller controls the energy storage device to power off. After the high voltage power is off, the system enters a dormant state.

[0033] Beneficial Effects

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] 1. The present invention can be operated through the under-vehicle operating device and the cab operating device, and the control status of each system will be displayed in the cab operating device. The DCDC converter, electric steering pump, electric air pump, and electric air conditioner can be directly operated, and the working conditions of pure electric or hybrid driving, driving water extraction, and parking water extraction can be selected, and the corresponding fire water pump power take-off can be combined and separated, and the travel-water pump power distribution box can be used to distribute power. The present invention can also use an external charging device to charge the pressure battery. The present invention is fully functional and intuitive and convenient to operate.

[0036] 2. The hybrid airport fire truck of the present invention innovatively mechanically connects the engine to the motor through an electromagnetic clutch, the output end of the motor is mechanically connected to the input end of the travel-water pump power distribution box, the first output end of the travel-water pump power distribution box is mechanically connected to the fire water pump power take-off, and the second output end of the travel-water pump power distribution box is mechanically connected to the drive wheel through an integrated gear transmission, so that the fire truck can achieve pure oil driving, hybrid driving and pure electric driving, and can adapt to a variety of working conditions.

[0037] 3. The fire truck of the present invention can perform firefighting operations in pure electric mode or in hybrid mode. The system pure electric mode can be automatically switched to hybrid mode according to the SOC value judgment condition, or switched manually by key operation.

[0038] 4. The fire truck of the present invention can realize on-site parking charging (through the power grid or engine-driven power generation) or driving charging (engine-driven power generation) during non-firefighting operation periods to ensure sufficient power and quickly respond to firefighting needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is an architecture diagram of the system of the present invention;

[0040] Figure 2 This is a control architecture diagram of the present invention;

[0041] Figure 3 It is a control flow chart of the present invention.

[0042] Among them: 1-under-vehicle operating device, 2-cab operating device, 3-system controller, 4-engine, 5-electromagnetic clutch, 6-motor, 7-motor controller, 8-high-voltage distribution box, 9-energy storage device, 10-external charging device, 11-DCDC converter, 12-electric steering pump, 13-electric air pump, 14-electric air conditioner, 15-fire water pump power take-off, 16-travel-water pump power distribution box, 17-integrated gear transmission, 18-driving wheel. DETAILED DESCRIPTION

[0043] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0044] See also Figure 1 to Figure 3 A power system of a hybrid airport fire truck includes an under-vehicle operating device 1, a cab operating device 2, a system controller 3, an engine 4, an electromagnetic clutch 5, a motor 6, a motor controller 7, a high-voltage distribution box 8, an energy storage device 9, an external charging device 10, a DCDC converter 11 (i.e., a DC-DC converter), an electric steering pump 12, an electric air pump 13, an electric air conditioner 14, a fire water pump power take-off 15, a travel-water pump power distribution box 16, an integrated gear transmission 17, and a drive wheel 18.

[0045] The engine 4 is any one of a diesel engine, a gasoline engine, a methanol engine, a hydrogen engine, and a natural gas engine. The energy storage device 9 includes a high-voltage battery body and an energy storage device controller; the electromagnetic clutch 5 includes an electromagnetic clutch mechanical body and an electromagnetic clutch controller; the integrated gear transmission 17 includes an integrated gear transmission mechanical body and a transmission controller.

[0046] The engine 4 is mechanically connected to the motor 6 through the electromagnetic clutch 5, the output end of the motor 6 is mechanically connected to the input end of the walking-water pump power distribution box 16, the first output end of the walking-water pump power distribution box 16 is mechanically connected to the fire water pump power take-off 15, and the second output end of the walking-water pump power distribution box 16 is mechanically connected to the drive wheel 18 through the integrated gear transmission 17.

[0047] The high-voltage distribution box 8 is electrically connected to the motor controller 7, the energy storage device 9, the external charging device 10, the DCDC converter 11, the electric steering pump 12, the electric air pump 13, and the electric air conditioner 14. The motor controller 7 is electrically connected to the motor 6. The system controller 3 is communicatively connected to the under-vehicle operating device 1, the cab operating device 2, the engine 4, the electromagnetic clutch 5, the motor controller 7, the high-voltage distribution box 8, the energy storage device 9, the DCDC converter 11, the electric steering pump 12, the electric air pump 13, the electric air conditioner 14, the fire water pump power take-off 15, the travel-water pump power distribution box 16, and the integrated gear gearbox 17.

[0048] The high-voltage distribution box 8 is electrically connected to the motor controller 7, the energy storage device 9, the external charging device 10, the DCDC converter 11, the electric steering pump 12, the electric air pump 13, and the electric air conditioner 14 through the high-voltage bus; the DC voltage range of the high-voltage bus is 300 to 1000V.

[0049] The system controller 3 receives the instructions from the vehicle operating device 1 and the cab operating device 2, converts them into execution demand signals after logical arbitration, and sends the instructions to the corresponding control components for execution. The control components are the engine 4, electromagnetic clutch 5, motor controller 7, high-voltage distribution box 8, energy storage device 9, DCDC converter 11, electric steering pump 12, electric air pump 13, electric air conditioner 14, fire pump power take-off 15, travel-water pump power distribution box 16, and integrated gear transmission 17.

[0050] After receiving the instruction from the system controller 3, the energy storage device 9 executes the connection and disconnection of the high-voltage battery relay based on the instruction. The high-voltage battery relay includes a main positive relay, a main negative relay and a pre-charge relay. The energy storage device 9 also feeds back the connection and separation status of the high-voltage battery relay, the remaining power SOC value, and the fault status to the system controller 3.

[0051] After receiving the instruction from the system controller 3, the high-voltage distribution box 8 executes the connection and disconnection of the high-voltage accessory relay based on the instruction. The high-voltage accessory relay includes a motor controller relay, a DCDC converter relay, an electric steering pump relay, an electric air pump relay, and an electric air conditioning relay. The high-voltage distribution box 8 also feeds back the connection and disconnection status of the high-voltage accessory relay and the external charging status to the system controller 3.

[0052] After receiving the instructions from the system controller 3, the motor controller 7 executes the enable, control mode, torque instruction, and speed instruction of the motor controller 7 based on the instructions, and the motor controller 7 feeds back the actual enable status, actual control mode status, actual torque value, actual speed value, and fault status of the motor controller 7 to the system controller 3.

[0053] After receiving the instructions from the system controller 3, the controller of the engine 4 executes the engine start and stop, control mode, torque instruction, and speed instruction based on the instructions. The controller of the engine 4 also feeds back the actual state of the engine start and stop, the actual state of the control mode, the actual torque value, the actual speed value, and the fault state to the system controller 3.

[0054] After receiving the command from the system controller 3 , the electromagnetic clutch 5 engages and disengages the electromagnetic clutch 5 based on the command, and the electromagnetic clutch 5 feeds back the engagement and disengagement states of the electromagnetic clutch to the system controller 3 .

[0055] After receiving the instruction from the system controller 3 , the DCDC converter 11 enables the DCDC converter 11 based on the instruction, and feeds back the actual enabling state, the DCDC converter output voltage value, and the fault state to the system controller 3 .

[0056] After receiving the instruction from the system controller 3 , the electric steering pump 12 enables the electric steering pump 12 based on the instruction, and feeds back the actual enabling state, actual steering pump speed, and fault state to the system controller 3 .

[0057] After receiving the instruction from the system controller 3 , the electric air pump 13 is enabled based on the instruction, and the electric air pump 13 feeds back the actual enabling state, the actual speed of the air pump, and the fault state to the system controller 3 .

[0058] After receiving the instruction from the system controller 3 , the electric air conditioner 14 enables the electric air conditioner 14 based on the instruction, and feeds back the actual enabling state, actual air conditioner outlet temperature, and fault state to the system controller 3 .

[0059] After receiving the instruction from the system controller 3 , the walking-water pump power distribution box 16 distributes power to the walking-water pump power distribution box 16 based on the instruction, and the walking-water pump power distribution box 16 feeds back the power distribution ratio and fault status to the system controller 3 .

[0060] After the fire pump power take-off 15 receives the instruction from the system controller 3, it engages and disengages the fire pump power take-off 15 and executes the water pump speed based on the instruction. The fire pump power take-off 15 also feeds back the actual engagement and disengagement status of the fire pump power take-off, the actual water pump speed, and the fault status to the system controller 3.

[0061] After receiving the instruction from the system controller 3 , the controller of the integrated gear transmission 17 performs gear switching and target gear execution based on the instruction, and feeds back the actual gear switching state, current gear and fault state to the system controller 3 .

[0062] After the system controller 3 collects the working status of each control component, it feeds back the system control status to the cab operating device 2 for status display, and the displayed content includes the SOC value of the remaining power of the high-voltage battery, vehicle speed, power generation status, engine operating status, electromagnetic clutch engagement status, travel-water pump power distribution box distribution ratio, fire pump power take-off operating status, integrated gear transmission gear status, DCDC converter operating status, electric steering pump operating status, electric air pump operating status, electric air conditioner start status, and system fault status. The display is intuitive and can facilitate corresponding operations.

[0063] A method for controlling a power system of a hybrid airport fire truck comprises the following steps:

[0064] Step 1. When the driver's key is powered on, the system controller 3 communicates with the under-vehicle operating device 7, the cab operating device 2, the engine 4, the electromagnetic clutch 5, the motor controller 7, the high-voltage distribution box 8, the energy storage device 9, the DCDC converter 11, the electric steering pump 12, the electric air pump 13, the electric air conditioner 14, the fire pump power take-off 15, the travel-water pump power distribution box 16, and the integrated gear transmission 17, and ensures that normal communication can be achieved;

[0065] Step 2. The system controller 3 collects the working status information of each control component; if there is no fault information, the system controller 3 controls the energy storage device 9 to perform high-voltage power-on operation; if there is fault information, the system controller 3 limits the corresponding function according to the fault level limit;

[0066] Step 3. If the high voltage power-on is completed normally and the system has no faults, the system controller 3 enters the system mode detection, and the system mode includes pure electric mode and hybrid mode;

[0067] Step 4. If the system mode detects the pure electric mode, if the SOC value is greater than the calibration threshold value A%, the system enters the pure electric mode activation state, corresponding to the motor 6 enabling operation, the DCDC converter 11 enabling operation, the electric steering pump 12 enabling operation, the electric air pump 13 enabling operation, and the electric air conditioner 14 enabling operation; based on the operation instructions of the cab operating device 2 or the operation instructions of the under-vehicle operating device 1, the operating conditions of pure electric driving, driving water extraction, and parking water extraction are selected, and the corresponding fire pump power take-off 15 is combined and separated, and the travel-water pump power distribution box 16 performs power distribution actions; based on the operation instructions of the cab operating device 2 or the operation instructions of the under-vehicle operating device 1, the speed of the fire pump can be increased or decreased to achieve changes in the water output and water output height of the fire pump; during the pure electric operation process, the SOC value will decrease, and when the SOC value is less than the calibration threshold value B%, the system automatically switches from the pure electric mode to the hybrid mode; in this embodiment, A=85, B=50, to ensure sufficient power, thereby ensuring the stability of the fire truck;

[0068] Step 5. If the system mode detects the pure electric mode and the SOC value is not greater than the calibration threshold value A%, the system directly enters the hybrid mode activation state;

[0069] Step 6. If the system mode detects the hybrid mode, the system enters the hybrid mode activation state, and correspondingly executes the engine 4 to start and run, the electromagnetic clutch 5 to engage, the motor 6 to enable operation, and then the DCDC converter 11 is enabled to run, the electric steering pump 12 is enabled to run, the electric air pump 13 is enabled to run, and the electric air conditioner 14 is enabled; based on the operating instructions of the cab operating device 2 or the operating instructions of the under-vehicle operating device 1, the operating conditions of hybrid driving, driving water extraction, and parking water extraction are selected, and the corresponding fire water pump power take-off 15 is engaged and separated, and the travel-water pump power distribution box 16 performs power distribution actions; based on the operating instructions of the cab operating device 2 or the operating instructions of the under-vehicle operating device 1, the fire water pump speed can be increased or decreased to achieve changes in the water output and water output height of the fire water pump.

[0070] Step 7. If the system detects that the vehicle is in parking state and the driver's key is powered off, the system controller 3 controls the energy storage device 9 to power off. After the high voltage power is off, the system enters a dormant state to save energy.

[0071] The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A power system of a hybrid airport fire truck, characterized in that: It includes an under-vehicle operating device (1), a cab operating device (2), a system controller (3), an engine (4), an electromagnetic clutch (5), a motor (6), a motor controller (7), a high-voltage distribution box (8), an energy storage device (9), an external charging device (10), a DCDC converter (11), an electric steering pump (12), an electric air pump (13), an electric air conditioner (14), a fire pump power take-off (15), a travel-water pump power distribution box (16), an integrated gear transmission (17), and a drive wheel (18); The engine (4) is mechanically connected to the motor (6) via the electromagnetic clutch (5); the output end of the motor (6) is mechanically connected to the input end of the travel-water pump power distribution box (16); the first output end of the travel-water pump power distribution box (16) is mechanically connected to the fire water pump power take-off (15); and the second output end of the travel-water pump power distribution box (16) is mechanically connected to the drive wheel (18) via the integrated gearbox (17); The high-voltage distribution box (8) is electrically connected to the motor controller (7), the energy storage device (9), the external charging device (10), the DCDC converter (11), the electric steering pump (12), the electric air pump (13), and the electric air conditioner (14); the motor controller (7) is electrically connected to the motor (6); and the system controller (3) is communicatively connected to the under-vehicle operating device (1), the cab operating device (2), the engine (4), the electromagnetic clutch (5), the motor controller (7), the high-voltage distribution box (8), the energy storage device (9), the DCDC converter (11), the electric steering pump (12), the electric air pump (13), the electric air conditioner (14), the fire pump power take-off (15), the travel-water pump power distribution box (16), and the integrated gear transmission (17).

2. The power system of a hybrid airport fire truck according to claim 1, characterized in that: The engine (4) is any one of a diesel engine, a gasoline engine, a methanol engine, a hydrogen engine, and a natural gas engine.

3. The power system of a hybrid airport fire truck according to claim 1, characterized in that: The high-voltage distribution box (8) is electrically connected to the motor controller (7), the energy storage device (9), the external charging device (10), the DCDC converter (11), the electric steering pump (12), the electric air pump (13), and the electric air conditioner (14) via a high-voltage bus; the DC voltage range of the high-voltage bus is 300 to 1000V.

4. The power system of a hybrid airport fire truck according to claim 1, characterized in that: The system controller (3) receives instructions from the under-vehicle operating device (1) and the cab operating device (2), converts them into execution request signals after performing logical arbitration, and sends the instructions to the corresponding control components for execution.

5. The power system of a hybrid airport fire truck according to claim 4, characterized in that: After receiving the instruction from the system controller (3), the energy storage device (9) performs the connection and disconnection of the high-voltage battery relay based on the instruction, the high-voltage battery relay includes a main positive relay, a main negative relay and a pre-charge relay, and the energy storage device (9) feeds back the connection and disconnection state of the high-voltage battery relay, the remaining power SOC value, and the fault state to the system controller (3); After receiving the instruction from the system controller (3), the high-voltage distribution box (8) executes the connection and disconnection of the high-voltage accessory relay based on the instruction. The high-voltage accessory relay includes a motor controller relay, a DCDC converter relay, an electric steering pump relay, an electric air pump relay, and an electric air conditioning relay. The high-voltage distribution box (8) also feeds back the connection and disconnection status of the high-voltage accessory relay and the external charging status to the system controller (3).

6. The power system of a hybrid airport fire truck according to claim 4, characterized in that: After receiving the instruction from the system controller (3), the motor controller (7) executes the enablement, control mode, torque instruction, and speed instruction of the motor controller (7) based on the instruction, and the motor controller (7) feeds back the actual enablement state, control mode actual state, torque actual value, speed actual value, and fault state of the motor controller (7) to the system controller (3); After receiving the command from the system controller (3), the controller of the engine (4) executes the start and stop of the engine, the control mode, the torque command, and the speed command based on the command, and the controller of the engine (4) feeds back the actual state of the start and stop of the engine, the actual state of the control mode, the actual value of the torque, the actual value of the speed, and the fault state to the system controller (3); After receiving the instruction from the system controller (3), the electromagnetic clutch (5) performs engagement and disconnection of the electromagnetic clutch (5) based on the instruction, and the electromagnetic clutch (5) feeds back the engagement and disconnection state of the electromagnetic clutch to the system controller (3).

7. The power system of a hybrid airport fire truck according to claim 4, characterized in that: After receiving the instruction from the system controller (3), the DCDC converter (11) enables the DCDC converter (11) based on the instruction, and the DCDC converter (11) feeds back the actual enabling state, the DCDC converter output voltage value, and the fault state to the system controller (3); After receiving the instruction from the system controller (3), the electric steering pump (12) enables the electric steering pump (12) based on the instruction, and the electric steering pump (12) feeds back the actual enabling state, the actual rotation speed of the steering pump, and the fault state to the system controller (3); After receiving the instruction from the system controller (3), the electric air pump (13) enables the electric air pump (13) based on the instruction, and the electric air pump (13) feeds back the actual enabling state, the actual speed of the air pump, and the fault state to the system controller (3); After receiving the instruction from the system controller (3), the electric air conditioner (14) enables the electric air conditioner (14) based on the instruction, and the electric air conditioner (14) feeds back the actual enabling state, the actual outlet temperature of the air conditioner, and the fault state to the system controller (3).

8. The power system of a hybrid airport fire truck according to claim 4, characterized in that: After receiving the instruction from the system controller (3), the travel-water pump power distribution box (16) distributes power to the travel-water pump power distribution box (16) based on the instruction, and the travel-water pump power distribution box (16) feeds back the power distribution ratio and fault status to the system controller (3); After receiving the instruction from the system controller (3), the fire pump power take-off (15) performs engagement and separation of the fire pump power take-off (15) and executes the water pump speed based on the instruction, and the fire pump power take-off (15) feeds back the actual engagement and separation state of the fire pump power take-off, the actual water pump speed, and the fault state to the system controller (3); After receiving the instruction from the system controller (3), the controller of the integrated gear transmission (17) performs gear switching and target gear execution based on the instruction, and the controller of the integrated gear transmission (17) feeds back the actual gear switching state, current gear, and fault state to the system controller (3).

9. The power system of a hybrid airport fire truck according to claim 1, characterized in that: The system controller (3) feeds back the system control status to the cab operating device (2) for status display, and the displayed content includes the SOC value of the remaining power of the high-voltage battery, the vehicle speed, the power generation status, the engine operating status, the electromagnetic clutch engagement status, the travel-water pump power distribution box distribution ratio, the fire water pump power take-off operating status, the integrated gear transmission gear status, the DCDC converter operating status, the electric steering pump operating status, the electric air pump operating status, the electric air conditioner start status, and the system fault status.

10. A method for controlling a power system of a hybrid airport fire truck, characterized in that: The following steps are involved: Step 1. When the driver's key is powered on, the system controller (3) communicates with the under-vehicle operating device (7), the cab operating device (2), the engine (4), the electromagnetic clutch (5), the motor controller (7), the high-voltage distribution box (8), the energy storage device (9), the DCDC converter (11), the electric steering pump (12), the electric air pump (13), the electric air conditioner (14), the fire pump power take-off (15), the travel-water pump power distribution box (16), and the integrated gear transmission (17), and ensures that normal communication is possible; Step 2. The system controller (3) collects the working status information of each control component; if there is no fault information, the system controller (3) controls the energy storage device (9) to perform high-voltage power-on operation; if there is fault information, the system controller (3) limits the corresponding function according to the fault level limit; Step 3. If the high voltage power-on is completed normally and the system has no faults, the system controller (3) enters the system mode detection, and the system mode includes pure electric mode and hybrid mode; Step 4. If the system mode detects the pure electric mode, if the SOC value is greater than the calibration threshold value A%, the system enters the pure electric mode activation state, and the corresponding motor (6) is enabled to run, the DCDC converter (11) is enabled to run, the electric steering pump (12) is enabled to run, the electric air pump (13) is enabled to run, and the electric air conditioner (14) is enabled; based on the operating instructions of the cab operating device (2) or the operating instructions of the under-vehicle operating device (1), the operating conditions of pure electric driving, driving water extraction, and parking water extraction are selected, and the corresponding fire pump power take-off (15) is combined and separated, and the travel-water pump power distribution box (16) performs power distribution actions; based on the operating instructions of the cab operating device (2) or the operating instructions of the under-vehicle operating device (1), the speed of the fire pump can be increased or decreased to achieve changes in the water output and water output height of the fire pump; during the pure electric operation, the SOC value will decrease, and when the SOC value is less than the calibration threshold value B%, the system automatically switches from the pure electric mode to the hybrid mode; Step 5. If the system mode detects the pure electric mode and the SOC value is not greater than the calibration threshold value A%, the system directly enters the hybrid mode activation state; Step 6. If the system mode detects the hybrid mode, the system enters the hybrid mode activation state, and correspondingly executes the engine (4) starting and running, the electromagnetic clutch (5) engaging, the motor (6) enabling operation, and then the DCDC converter (11) enabling operation, the electric steering pump (12) enabling operation, the electric air pump (13) enabling operation, and the electric air conditioner (14) enabling operation; based on the operating instructions of the cab operating device (2) or the operating instructions of the under-vehicle operating device (1), the operating conditions of hybrid driving, driving water extraction, and parking water extraction are selected, and the corresponding fire pump power take-off (15) engagement and separation actions are executed, and the travel-water pump power distribution box (16) performs power distribution actions; based on the operating instructions of the cab operating device (2) or the operating instructions of the under-vehicle operating device (1), the speed of the fire pump can be increased or decreased to achieve changes in the water output and water output height of the fire pump; Step 7. If the system detects that the vehicle is in parking state and detects that the driver's key is powered off, the system controller (3) controls the energy storage device (9) to power off. After the high voltage power is turned off, the system enters a dormant state.

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