P3 parallel hybrid fire engine chassis

Abstract

The utility model discloses a kind of fire engine chassis based on P3 parallel hybrid, including engine, clutch, automatic gearbox, driving motor, power takeoff, high-power water pump, power battery and transfer case, the engine is connected with automatic gearbox, and the engine is parallelly arranged with clutch, automatic gearbox and driving motor, the driving motor is electrically connected with power battery, the driving motor is connected with high-power water pump by power takeoff, the transfer case is used to disconnect coupling driving motor shaft, transmission front axle, transmission rear axle;The utility model is driven by the unique design of engine and driving motor parallelly, since driving motor has the characteristics of instantaneous output strong torque, cooperates with engine, so that the acceleration performance of fire engine is greatly improved, simultaneously in routine operation, driving motor can undertake power output task under partial working condition, reduce the running time and load of engine, to reduce fuel consumption.

Description

Technical Field

[0001] This utility model belongs to the field of fire truck technology. Specifically, this utility model relates to a fire truck chassis based on P3 parallel hybrid power. Background Technology

[0002] The product is a dedicated chassis for airport fire trucks, used for airport fire rescue. Currently, typical dedicated chassis for airport fire trucks have one or two high-horsepower engines. If a single engine is used, a power distributor needs to be installed, and the engine can drive both the vehicle and the high-power fire pump at the same time. If two engines are used, one of the engines can drive both the vehicle and the fire pump.

[0003] The engine's starting and acceleration performance is poor due to its own output characteristics. A single engine-driven solution relies on a limited number of suppliers for key components, resulting in high costs and hindering industry development. Engine emissions impact the environment, and exhaust gases generated during startup in parking garages require special treatment. The vehicle needs to take off to operate, and a high-power water pump is required to operate at full power while the vehicle travels at different speeds. This power take-off method is difficult to achieve and requires the use of imported components. Utility Model Content

[0004] This invention provides a fire truck chassis based on P3 parallel hybrid power, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a fire truck chassis based on P3 parallel hybrid power, including an engine, a clutch, an automatic transmission, a drive motor, a power take-off, a high-power water pump, a power battery, and a transfer case. The engine is connected to the automatic transmission, and the engine, clutch, automatic transmission, and drive motor are arranged in parallel. The drive motor is electrically connected to the power battery. The drive motor is connected to the high-power water pump through the power take-off. The transfer case is used to disconnect the drive motor shaft, the front drive shaft, and the rear drive shaft.

[0006] Preferably, it also includes a vehicle control unit (VCU), a battery management system (BMS), and a motor controller (MCU). The VCU is communicatively connected to the BMS, MCU, and engine controller (ECU) respectively, and is used to schedule the power output of the engine and drive motor according to the battery SOC and operating conditions.

[0007] Preferably, the transfer case includes a front axle coupling mechanism and a rear axle coupling mechanism, the rated power of the drive motor is ≥300kW, the capacity of the power battery is ≥200kWh, and the rated power of the high-power water pump is ≥200kW.

[0008] Preferably, the power take-off is hydraulic and is located between the output shaft of the drive motor and the input shaft of the water pump, for transmitting the power of the drive motor to the water pump.

[0009] The beneficial effects of adopting the above technical solutions are:

[0010] I. Through the unique design of parallel hybrid drive of engine and drive motor, the drive motor has the characteristic of instantaneous output of strong torque. Working together with the engine, the acceleration performance of the fire truck is greatly improved. At the same time, in daily operation, the drive motor can undertake the power output task under some working conditions, reducing the engine's running time and load, thereby reducing fuel consumption.

[0011] Second, the hybrid drive system of the engine and drive motor gives the chassis strong fault tolerance. When the drive motor fails, the engine can independently take over the responsibility of driving the vehicle, ensuring that the fire truck can still drive to a safe area or repair location. Conversely, if the engine fails, the drive motor can take over in time to maintain the basic operation of the vehicle. Attached Figure Description

[0012] Figure 1 This is a system block diagram provided by this utility model;

[0013] Figure 2 This is a block diagram of energy transmission provided by this utility model; Detailed Implementation

[0014] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of this utility model, and to facilitate its implementation.

[0015] Specifically, such as Figure 1 and Figure 2 As shown, a fire truck chassis based on P3 parallel hybrid power includes an engine, a clutch, an automatic transmission, a drive motor, a power take-off, a high-power water pump, a power battery, and a transfer case. The engine is connected to the automatic transmission, and the engine, clutch, automatic transmission, and drive motor are arranged in parallel. The drive motor is electrically connected to the power battery. The drive motor is connected to the high-power water pump through the power take-off. The transfer case is used to disconnect the drive motor shaft, the front drive shaft, and the rear drive shaft.

[0016] It also includes a vehicle control unit (VCU), a battery management system (BMS), and a motor controller (MCU). The VCU is connected to the BMS, MCU, and engine controller (ECU) respectively, and is used to schedule the power output of the engine and drive motor according to the battery SOC and operating conditions.

[0017] The transfer case includes a front axle coupling mechanism and a rear axle coupling mechanism. The rated power of the drive motor is ≥300kW, the capacity of the power battery is ≥200kWh, and the rated power of the high-power water pump is ≥200kW.

[0018] The power take-off is hydraulic and is located between the output shaft of the drive motor and the input shaft of the water pump, used to transmit the power of the drive motor to the water pump.

[0019] It should be noted that the engine is connected to the automatic transmission, which ensures that the engine's power can be effectively transmitted to the automatic transmission to realize the vehicle's gear shifting function. At the same time, the engine, clutch, automatic transmission and drive motor are set up in parallel, which provides the vehicle with multiple power output methods and flexible driving strategies. The drive motor is electrically connected to the power battery, which provides power support to the drive motor, enabling the drive motor to drive the vehicle independently or assist the engine.

[0020] In addition, the drive motor is connected to a high-power water pump via a power take-off (PTO). When firefighting water pumping is required, the drive motor can transmit power to the high-power water pump via the PTO to enable the pump to operate. The transfer case is used to disconnect the drive motor shaft, the front drive axle, and the rear drive axle. By operating the transfer case, the power distribution path can be flexibly controlled to meet the vehicle's driving needs under different working conditions. For example, in four-wheel drive off-road conditions, the transfer case can couple the front and rear axles to enable the vehicle to drive in four-wheel drive mode. Example 1

[0021] Work steps:

[0022] Step S10: Determine if the engine needs to be started. If so, engage the clutch and start the engine by driving the drive motor, then proceed to the next step. Otherwise, put the vehicle into pure electric driving mode and low-speed driving mode.

[0023] Step S20: Determine whether the engine has started successfully. If so, proceed to the next step. Otherwise, put the vehicle into pure electric driving mode and low-speed driving mode.

[0024] Step S30: Determine if the vehicle needs water. If yes, proceed to the next step; otherwise, enter normal driving conditions.

[0025] Step S40: Determine whether the vehicle is stopped for water filling. If so, enter the stopped water filling mode; otherwise, enter the pure electric water filling mode.

[0026] It should be noted that, in addition to the ascending operating condition, the following operating conditions are also included:

[0027] In four-wheel drive mode, when the rear wheels of the vehicle are stuck, the driver activates the four-wheel drive mode. The transfer case synchronously couples the front and rear axle drive shafts. The drive motor and engine power are combined and distributed to the four wheels. The VCU limits the output torque to avoid overload of the transmission system. After getting out of trouble, it automatically switches to two-wheel drive mode.

[0028] In the parking power generation mode, when the vehicle is parked and the SOC is less than 15%, the driver activates the power generation mode, the clutch engages, the engine operates at an economical speed of 1800 rpm (output 200kW), the drive motor switches to power generation mode, and stores 180kW of electrical energy in the power battery. When the SOC is charged to 80%, the motor automatically shuts down.

[0029] The normal driving conditions are divided into the following categories based on the battery pack's SOC:

[0030] (1) Battery pack SOC < lower limit: Transfer case coupling, clutch closed, engine high power output, drive motor in generator mode, part of engine power is used to drive the vehicle, priority is given to ensuring that the excess power of the driving power is used to assist the drive motor in generating electricity to charge the battery pack.

[0031] (2) Upper limit > battery pack SOC > lower limit: transfer case coupling, clutch engagement, engine, drive motor scheduling optimal efficiency point output power for vehicle driving;

[0032] (3) Battery pack SOC > upper limit: Transfer case coupling, clutch disengagement, drive motor outputs high power, consuming battery power. If the drive motor power is insufficient, the engine works to compensate for the drive motor power.

[0033] The parking water filling condition is divided into the following situations based on the battery pack SOC:

[0034] (1) Battery pack SOC < lower limit: Transfer case in neutral, clutch closed, engine working at full power to provide power to high-power water pump, drive motor in generator state to replenish battery pack;

[0035] (2) Upper limit > Battery pack SOC > Lower limit: Transfer case in neutral, engine and drive motor provide power to high power water pump according to the optimal efficiency;

[0036] (3) When the transfer case is in neutral, the clutch is disengaged, the drive motor provides power to the high-power water pump, and the engine provides power to make up for the insufficient power of the drive motor.

[0037] The pure electric water pumping mode is divided into the following cases based on the battery pack SOC:

[0038] (1) Battery pack SOC < lower limit: Transfer case coupling, clutch closed, engine working at full power to provide power to high-power water pump and drive driving. After ensuring that the high-power water pump has sufficient power, the drive motor is in the generator state to replenish the battery pack.

[0039] (2) Upper limit > Battery pack SOC > Lower limit: Transfer case coupling, clutch engagement, engine and drive motor provide power to high-power water pump according to the optimal efficiency;

[0040] (3) Battery pack SOC > upper limit: Transfer case coupling, clutch closed, drive motor works at full power to provide power to high power water pump and drive driving, engine provides power to make up for the insufficient power of drive motor.

[0041] For example, the parameters of a fire truck at an airport are:

[0042] Engine: 550hp, Drive motor: 350kW, Power battery: 300kWh, Water pump: 250kW

[0043] Water dispensing scenario while driving (SOC=50%):

[0044] 1. VCU detects water demand & vehicle speed > 0 → enters driving water dispensing mode;

[0045] 2. When the SOC is between the lower limit (30%) and the upper limit (70%), the transfer case is coupled and the clutch is engaged.

[0046] 3. The engine outputs 400kW (of which 250kW is for the water pump and 150kW is for driving the vehicle).

[0047] 4. The drive motor outputs 150kW to assist in vehicle drive.

[0048] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A fire truck chassis based on P3 parallel hybrid power, characterized in that, The system includes an engine, a clutch, an automatic transmission, a drive motor, a power take-off (PTO), a high-power water pump, a power battery, and a transfer case. The engine is connected to the automatic transmission, and the engine, clutch, automatic transmission, and drive motor are connected in parallel. The drive motor is electrically connected to the power battery. The drive motor is connected to the high-power water pump via the PTO. The transfer case is used to disconnect the drive motor shaft, the front drive shaft, and the rear drive shaft.

2. The fire truck chassis based on P3 parallel hybrid power according to claim 1, characterized in that, It also includes a vehicle control unit (VCU), a battery management system (BMS), and a motor controller (MCU). The VCU is connected to the BMS, MCU, and engine controller (ECU) respectively, and is used to schedule the power output of the engine and drive motor according to the battery SOC and operating conditions.

3. A fire truck chassis based on P3 parallel hybrid power according to claim 1, characterized in that, The transfer case includes a front axle coupling mechanism and a rear axle coupling mechanism. The rated power of the drive motor is ≥300kW, the capacity of the power battery is ≥200kWh, and the rated power of the high-power water pump is ≥200kW.

4. A fire truck chassis based on P3 parallel hybrid power according to claim 1, characterized in that, The power take-off is hydraulic and is located between the output shaft of the drive motor and the input shaft of the water pump, used to transmit the power of the drive motor to the water pump.

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