Hybrid Firefighting Vehicle Powertrain for Sustained 50 MPH Response
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Solution Overview
Problem
Firefighting vehicles, particularly ARFF vehicles, face challenges in achieving rapid response times and maintaining high speeds over extended periods due to the limitations of traditional internal combustion engine powertrains.
Innovation Solution
The implementation of a hybrid powertrain system in firefighting vehicles, which includes an engine, a battery pack, and an electromechanical transmission. This system allows for the generation and storage of energy, enabling the vehicle to accelerate to 50 mph in under 30 seconds and maintain speed for at least three minutes, while also reducing fuel consumption and emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a traditional internal combustion engine powertrain is used, then the vehicle structure is simpler, but the acceleration performance and top speed capability are insufficient
Solution Approach 1:
The patent combines an internal combustion engine with an electric motor to create a hybrid powertrain system. The engine and motor are merged through a power divider that distributes power to both the drive wheels and the pump, enabling the vehicle to achieve 50 mph acceleration and maintain top speed while managing the complexity through integrated control
2Productivity
If a hybrid powertrain system is implemented to improve acceleration and speed, then energy consumption increases, but fuel efficiency and emissions are reduced
Solution Approach 1:
The hybrid powertrain system performs multiple functions: the engine and electric motor can operate independently or together to drive the wheels, the power divider can route power to either the drive wheels or the pump, and the battery pack can provide auxiliary power. This multi-functionality enables optimized energy usage for different operational scenarios, improving response time while managing fuel consumption and emissions
3Speed
If the battery pack state-of-charge is maintained above a minimum threshold for sustained high-speed operation, then the acceleration performance is improved, but the energy availability for other vehicle functions is reduced
Solution Approach 1:
The system dynamically adjusts power distribution based on real-time conditions. The controller monitors battery state-of-charge and dynamically routes power through the power divider to either the drive wheels during acceleration or the pump during fluid delivery operations. This dynamic allocation ensures minimum state-of-charge thresholds are maintained for sustained high-speed operation while ensuring adequate energy availability for pump and auxiliary functions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The hybrid powertrain system enhances the firefighting vehicle's acceleration and top speed, improving response times and operational efficiency while providing a more environmentally friendly solution.
Implementation Method 1
The electromechanical transmission is configured to (i) generate energy based on a mechanical engine output provided by the engine
Implementation Method 2
selectively provide the energy generated to the battery pack for storage as stored energy
Data Source
AI summary
An electrified fire fighting vehicle includes a battery pack, an electric motor, and a controller configured to operate the electric motor using stored energy in the battery pack to provide a performance condition including (i) accelerating the electrified fire fighting vehicle to a driving speed of at least 50 miles-per-hour in an acceleration time and (ii) maintaining or exceeding the driving speed for a period of time. The acceleration time is 30 second or less. An aggregate of the acceleration time and the period of time is at least 3 minutes.