A power system and control method for a hybrid airport fire truck

Abstract

This invention discloses a power system and control method for a hybrid airport fire truck, belonging to the field of new energy power system technology. The system comprises: an engine connected to a motor via an electromagnetic clutch; the motor connected to the input end of a travel-pump power distribution box; the travel-pump power distribution box connected to a fire pump power take-off (PTO); and a mechanical connection to the drive wheels via an integrated gearbox. A high-voltage distribution box electrically connects to a motor controller, energy storage device, external charging device, DC-DC 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 devices, driver's cab operating devices, engine, electromagnetic clutch, motor controller, high-voltage distribution box, energy storage device, DC-DC converter, electric steering pump, electric air pump, electric air conditioner, fire pump PTO, travel-pump power distribution box, and integrated gearbox. The system is fully functional, intuitive, and convenient to operate, enabling both hybrid and pure electric driving.

Description

Technical Field

[0001] This invention relates to the field of new energy power system technology, and more specifically, to a power system and control method for a hybrid airport fire truck. Background Technology

[0002] A fire truck is a vehicle specifically designed and manufactured for firefighting operations. Suitable for firefighters, it is equipped with various firefighting equipment and extinguishing agents, and can perform tasks such as firefighting, assisting in firefighting, fire rescue, and emergency disaster relief. Fire trucks play a vital role in maintaining public safety, and their functions and performance are becoming increasingly diversified and specialized to meet the needs of various emergencies. Therefore, as an important piece of 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, current hybrid airport fire trucks suffer from incomplete functionality and are not intuitive or convenient to operate. Summary of the Invention

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

[0005] The second objective of this invention is to provide a control method for the power system of a hybrid airport fire truck.

[0006] To achieve the above objective, the present invention provides a power system for a hybrid airport fire truck, including an under-vehicle operating device, a driver's 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 DC-DC converter, an electric steering pump, an electric air pump, an electric air conditioner, a fire pump power take-off, a travel-pump power distribution box, an integrated gearbox, and drive wheels.

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

[0008] The high-voltage distribution box is electrically connected to the motor controller, energy storage device, external charging device, DC-DC 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, driver's cab operating device, engine, electromagnetic clutch, motor controller, high-voltage distribution box, energy storage device, DC-DC converter, electric steering pump, electric air pump, electric air conditioner, fire pump power take-off, travel-pump power distribution box, and integrated gearbox.

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

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

[0011] Furthermore, the system controller receives instructions from the under-vehicle operating device and the driver's cab operating device, performs logical arbitration judgment, converts them into execution demand signals, and sends 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. 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 status of the high-voltage battery relay, the remaining power SOC value, and the fault status to the system controller.

[0013] After receiving the instruction from the system controller, the high-voltage distribution box performs the connection and disconnection of the high-voltage accessory relays based on the instruction. The high-voltage accessory relays include motor controller relays, DC-DC 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 enable, control mode, torque instruction, and speed instruction of the motor controller based on the instruction. The motor controller also feeds back the actual enable status, actual control mode status, actual torque value, actual speed value, and fault status of the motor controller to the system controller.

[0015] After receiving the instructions from the system controller, the engine controller executes the engine start and stop, control mode, torque command, and speed command based on the instructions. The engine controller also feeds back the actual start and stop status, actual control mode status, actual torque value, actual speed value, and fault status of the engine to the system controller.

[0016] After receiving the command from the system controller, the electromagnetic clutch engages and disengages based on the command, and then feeds back the engagement and disengagement status of the electromagnetic clutch to the system controller.

[0017] Furthermore, after receiving the instruction from the system controller, the DC-DC converter enables itself based on the instruction, and then feeds back the actual enable status, the DC-DC converter output voltage value, and the fault status to the system controller.

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

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

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

[0021] Furthermore, after receiving the instruction from the system controller, the walking-water pump power distribution box performs power distribution based on the instruction, and the walking-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 power take-off of the fire pump performs the engagement and disengagement of the power take-off and executes the pump speed based on the instruction. The power take-off also feeds back the actual engagement and disengagement status of the fire pump, the actual pump speed, and the fault status to the system controller.

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

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

[0025] To achieve the second objective mentioned above, the present invention provides a control method for the 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 under-vehicle operating device, the cab operating device, the engine, the electromagnetic clutch, the motor controller, the high-voltage distribution box, the energy storage device, the DC-DC converter, the electric steering pump, the electric air pump, the electric air conditioner, the fire pump power take-off, the travel-pump power distribution box, and the integrated gearbox, and ensures that normal communication is possible.

[0027] Step 2. The system controller collects the operating 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 restricts the corresponding function according to the fault level.

[0028] Step 3. If the high-voltage power-on is completed normally and the system is fault-free, the system controller enters the system mode detection, which includes pure electric mode and hybrid mode.

[0029] Step 4. If the system detects pure electric mode, and the SOC value is greater than the calibrated threshold A%, the system enters the pure electric mode activation state, corresponding to the activation of the motor, DC-DC converter, electric steering pump, electric air pump, and electric air conditioning. Based on the operation commands of the cab control device or the under-vehicle control device, the system selects the operating conditions of pure electric driving, driving water intake, and parking water intake, and executes the corresponding engagement and disengagement actions of the fire pump power take-off, as well as the power distribution action of the travel-pump power distribution box. Based on the operation commands of the cab control device or the under-vehicle control device, the fire pump speed can be increased or decreased to realize the change of the fire pump's output water volume and height. During pure electric operation, the SOC value will decrease. When the SOC value is less than the calibrated threshold B%, the system automatically switches from pure electric mode to hybrid mode.

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

[0031] Step 6. If the system detects hybrid mode, the system enters hybrid mode activation state, correspondingly executing engine start and operation, electromagnetic clutch engagement, motor enabling operation, DCDC converter enabling operation, electric power steering pump enabling operation, electric air pump enabling operation, and electric air conditioning enabling operation; based on the operation commands of the cab operating device or the operation commands of the under-vehicle operating device, select the working condition requirements of hybrid driving, driving water intake, and parking water intake, and execute the corresponding engagement and disengagement actions of the fire pump power take-off, as well as the power distribution action of the travel-pump power distribution box; based on the operation commands of the cab operating device or the operation commands of the under-vehicle operating device, the speed of the fire pump can be increased or decreased to realize the change of the fire pump's output water volume and output height.

[0032] Step 7. If the system detects that the vehicle is in a parked 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 is powered off, the system enters a dormant state.

[0033] Beneficial effects

[0034] Compared with the prior art, the advantages of this invention are as follows:

[0035] 1. This 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 on the cab operating device. It can directly operate the DC-DC converter, electric steering pump, electric air pump, and electric air conditioner, and select the working conditions of pure electric or hybrid driving, driving water intake, and parking water intake. It can also perform the corresponding engagement and disengagement actions of the fire pump power take-off and the power distribution action of the travel-water pump power distribution box. This invention can also use an external charging device to charge the battery. This invention is fully functional and intuitive to operate.

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

[0037] 3. The fire truck of the present invention can carry out firefighting operations in pure electric mode or in hybrid mode. The system can automatically switch from pure electric mode to hybrid mode based on the SOC value judgment condition, or can be switched manually by button operation.

[0038] 4. The fire truck of the present invention can be charged on-site while parked (through the power grid or engine-driven power generation) or while driving (through engine-driven power generation) during non-firefighting periods, ensuring sufficient power and enabling rapid response to firefighting needs. Attached Figure Description

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

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

[0041] Figure 3 This is the control flowchart of the present invention.

[0042] Among them: 1-Under-vehicle operating device, 2-Cockpit 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-DC-CDC converter, 12-Electric steering pump, 13-Electric air pump, 14-Electric air conditioner, 15-Fire pump power take-off, 16-Travel-water pump power distribution box, 17-Integrated gearbox, 18-Drive wheel. Detailed Implementation

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

[0044] See Figures 1-3 A power system for a hybrid airport fire truck includes an under-vehicle operating device 1, a driver's 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 DC-DC 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 pump power take-off 15, a travel-pump power distribution box 16, an integrated gearbox 17, and drive wheels 18.

[0045] Engine 4 can be any one of a diesel engine, gasoline engine, methanol engine, hydrogen engine, or natural gas engine. Energy storage device 9 includes a high-voltage battery body and an energy storage device controller; electromagnetic clutch 5 includes an electromagnetic clutch mechanical body and an electromagnetic clutch controller; integrated gearbox 17 includes an integrated gearbox mechanical body and a gearbox controller.

[0046] 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 pump power take-off 15. 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.

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

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

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

[0050] 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. The energy storage device 9 also feeds back the connection and disconnection status of the high-voltage battery relay, as well as the remaining power SOC value and fault status to the system controller 3.

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

[0052] After receiving the instruction 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 instruction. The motor controller 7 also 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 engine 4 executes the engine start and stop, control mode, torque command, and speed command based on the instructions. The controller of engine 4 also feeds back the actual start and stop status, actual control mode status, actual torque value, actual speed value, and fault status of the engine to the system controller 3.

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

[0055] After receiving the instruction from the system controller 3, the DC-DC converter 11 enables itself based on the instruction, and then feeds back the actual enable status, the DC-DC converter output voltage value, and the fault status to the system controller 3.

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

[0058] After receiving the instruction from the system controller 3, the electric air conditioner 14 enables itself based on the instruction, and feeds back the actual enable status, the actual outlet temperature of the air conditioner, and the fault status 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 then feeds back the power distribution ratio and fault status to the system controller 3.

[0060] After receiving the instruction from the system controller 3, the fire pump power take-off 15 engages and disengages and the pump speed is executed 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 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 gearbox 17 performs gear switching and target gear execution based on the instruction. The controller of the integrated gearbox 17 also feeds back the actual gear switching status, current gear, and fault status to the system controller 3.

[0062] After collecting the operating status of each control component, the system controller 3 feeds back the system control status to the driver's cab operating device 2 for status display. The displayed information includes the remaining SOC value of the high-voltage battery, vehicle speed, generator status, engine operating status, electromagnetic clutch engagement status, power distribution ratio between the travel and water pump distribution box, power take-off status of the fire pump, gear position status of the integrated gearbox, operating status of the DC-DC converter, operating status of the electric steering pump, operating status of the electric air pump, electric air conditioning status, and system fault status. The display is intuitive and facilitates corresponding operations.

[0063] A control method for the power system of a hybrid airport fire truck includes 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 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 DC-DC 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 gearbox 17, and ensures that normal communication is possible;

[0065] Step 2. The system controller 3 collects the operating 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 restricts the corresponding function according to the fault level restriction.

[0066] Step 3. If the high-voltage power-on is completed normally and the system is fault-free, the system controller 3 enters the system mode detection. The system modes include pure electric mode and hybrid mode.

[0067] Step 4. If the system detects a pure electric mode, and the SOC value is greater than the calibrated threshold A%, the system enters the pure electric mode activation state, corresponding to the activation of motor 6, DC-DC converter 11, electric steering pump 12, electric air pump 13, and electric air conditioner 14. Based on the operation commands of the cab operating device 2 or the under-vehicle operating device 1, the system selects the operating conditions of pure electric driving, driving water intake, and parking water intake, and executes the corresponding engagement and disengagement actions of the fire pump power take-off 15, as well as the power distribution action of the traveling-pump power distribution box 16. Based on the operation commands of the cab operating device 2 or the under-vehicle operating device 1, the speed of the fire pump can be increased or decreased to realize the change of the fire pump's output water volume and height. During pure electric operation, the SOC value will decrease. When the SOC value is less than the calibrated threshold B%, the system automatically switches from pure electric mode to hybrid mode. In this embodiment, A=85 and B=50 to ensure sufficient power, thereby ensuring the stability of the fire truck's operation.

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

[0069] Step 6. If the system detects a hybrid mode, the system enters the hybrid mode activation state, correspondingly executing the starting and running of engine 4, engagement of electromagnetic clutch 5, and enabling of motor 6. Then, the DC-DC converter 11, electric steering pump 12, electric air pump 13, and electric air conditioning 14 are enabled. Based on the operation commands of the cab operating device 2 or the operation commands of the under-vehicle operating device 1, the system selects the operating conditions of hybrid driving, driving water intake, and parking water intake, and executes the corresponding engagement and disengagement actions of the fire pump power take-off 15, as well as the power distribution action of the travel-pump power distribution box 16. Based on the operation commands of the cab operating device 2 or the operation commands of the under-vehicle operating device 1, the speed of the fire pump can be increased or decreased to realize the change of the fire pump's output water volume and height.

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

[0071] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A power system for a hybrid airport fire truck, characterized in that, Includes under-vehicle operating device (1), cab operating device (2), system controller (3), engine (4), electromagnetic clutch (5), motor (6), motor controller (7), high-voltage distribution box (8), energy storage device (9), external charging device (10), DC-DC converter (11), electric steering pump (12), electric air pump (13), electric air conditioner (14), fire pump power take-off (15), travel-pump power distribution box (16), integrated gearbox (17), and 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 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 pump power take-off (15). The second output end of the walking-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), energy storage device (9), external charging device (10), DC-DC converter (11), electric steering pump (12), electric air pump (13), and 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), driver's cab operating device (2), engine (4), electromagnetic clutch (5), motor controller (7), high-voltage distribution box (8), energy storage device (9), DC-DC converter (11), electric steering pump (12), electric air pump (13), electric air conditioner (14), fire pump power take-off (15), walking-water pump power distribution box (16), and integrated gearbox (17). The control method for the power system includes the following steps: Step 1. When the driver's key is powered on, the system controller (3) communicates with 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 DC-DC 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-pump power distribution box (16), and the integrated gearbox (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) restricts the corresponding function according to the fault level restriction. Step 3. If the high voltage power-on is completed normally and the system is fault-free, the system controller (3) enters the system mode detection. The system modes include pure electric mode and hybrid mode. Step 4. If the system detects pure electric mode, and the SOC value is greater than the calibrated threshold A%, the system enters the pure electric mode activation state, and the corresponding motor (6) is enabled to run, the DC-DC 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 operation instructions of the cab operating device (2) or the operation instructions of the under-vehicle operating device (1), select the working conditions of pure electric driving, driving water intake, and parking water intake, and execute the corresponding combination and separation actions of the fire pump power take-off (15), and the power distribution action of the walking-water pump power distribution box (16); 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 realize the change of the water output and water height of the fire pump; during pure electric operation, the SOC value will decrease, and when the SOC value is less than the calibrated threshold B%, the system automatically switches from pure electric mode to hybrid mode; Step 5. If the system detects pure electric mode and the SOC value is not greater than the calibrated threshold A%, the system directly enters the hybrid mode activation state. Step 6. If the system 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 and run, and then the DC-DC converter (11) to enable and run, the electric steering pump (12) to enable and run, the electric air pump (13) to enable and run, and the electric air conditioner (14) to enable; based on the operation instructions of the cab operating device (2) or the operation instructions of the under-vehicle operating device (1), select the working conditions of hybrid driving, driving water intake, and parking water intake, and execute the corresponding engagement and disengagement actions of the fire pump power take-off (15), and the power distribution action of the walking-water pump power distribution box (16); 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 realize the change of the water output and water height of the fire pump; Step 7. If the system detects that the vehicle is in a parked state and detects that the driver key is powered off, the system controller (3) controls the energy storage device (9) to power off. After the high voltage is powered off, the system enters a hibernation state.

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, or 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), energy storage device (9), external charging device (10), DC-DC converter (11), electric steering pump (12), electric air pump (13), and electric air conditioner (14) via the high-voltage busbar; the DC voltage range of the high-voltage busbar 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), performs logical arbitration judgment, converts them into execution demand signals, and sends 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. The energy storage device (9) also feeds back the connection and disconnection status of the high-voltage battery relay, as well as the remaining power SOC value and fault status to the system controller (3). After receiving the instruction from the system controller (3), the high-voltage distribution box (8) performs the connection and disconnection of the high-voltage accessory relays based on the instruction. The high-voltage accessory relays include motor controller relays, DC-DC converter relays, electric steering pump relays, electric air pump relays, and electric air conditioning relays. The high-voltage distribution box (8) also feeds back the connection and disconnection status of the high-voltage accessory relays 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 enable, control mode, torque instruction, and speed instruction of the motor controller (7) based on the instruction. The motor controller (7) also 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). After receiving the instruction 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 instruction. The controller of the engine (4) also feeds back the actual start and stop status, actual control mode status, actual torque value, actual speed value, and fault status of the engine to the system controller (3). After receiving the instruction from the system controller (3), the electromagnetic clutch (5) performs the engagement and disengagement of the electromagnetic clutch (5) based on the instruction, and the electromagnetic clutch (5) feeds back the engagement and disengagement status 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 DC-DC converter (11) enables itself based on the instruction, and feeds back the actual enable status, the DC-DC converter output voltage value, and the fault status to the system controller (3). After receiving the instruction from the system controller (3), the electric steering pump (12) enables itself based on the instruction, and feeds back the actual enabling status, actual steering pump speed, and fault status to the system controller (3). After receiving the instruction from the system controller (3), the electric air pump (13) enables itself based on the instruction, and feeds back the actual enabling status, the actual speed of the air pump, and the fault status to the system controller (3). After receiving the instruction from the system controller (3), the electric air conditioner (14) enables itself based on the instruction, and feeds back the actual enable status, the actual outlet temperature of the air conditioner, and the fault status 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 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). After receiving the instruction from the system controller (3), the fire pump power take-off (15) performs the engagement and disengagement of the fire pump power take-off (15) and executes the 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 pump speed, and the fault status to the system controller (3). After receiving the instruction from the system controller (3), the controller of the integrated gearbox (17) performs gear switching and target gear execution based on the instruction. The controller of the integrated gearbox (17) also feeds back the actual gear switching status, current gear, and fault status 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. The displayed content includes the remaining SOC value of the high-voltage battery, vehicle speed, power generation status, engine running status, electromagnetic clutch engagement status, travel-water pump power distribution box distribution ratio, fire pump power take-off running status, integrated gearbox gear status, DCDC converter running status, electric steering pump running status, electric air pump running status, electric air conditioner on status, and system fault status.

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