Fuel Cell Charging Control During Utility Vehicle Rest Stops
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Solution Overview
Problem
Utility vehicles with electric motor drives and fuel cells face significant wear and degradation due to frequent start-ups and shut-downs during driving interruptions, which are common on long-distance journeys, leading to increased maintenance costs and reduced system lifespan.
Innovation Solution
A method that controls the fuel cell to maintain a continuous operation during driving interruptions by charging the electrical storage system, reducing the need for shutdowns and restarts by adjusting the operating point and energy supply based on planned journey information, including duration, route topography, and rest periods, thereby minimizing wear on the fuel cell system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel cell system is shut down during driving interruptions, then the vehicle complies with legal rest period regulations, but wear and degradation of the fuel cell system increases due to frequent start-ups and shut-downs
Solution Approach 1:
The fuel cell system continues to operate during driving interruptions by charging the electrical storage system, maintaining continuous useful action rather than shutting down. This eliminates wear from start-stop cycles while still allowing the vehicle to comply with rest period regulations, as the continued operation is for energy storage purposes not propulsion.
Solution Approach 2:
The system performs preliminary charging of the electrical storage system during driving interruptions before the next journey segment begins. This preliminary action ensures energy availability for the next driving period while keeping the fuel cell running at stable conditions, avoiding frequent shutdowns and extensions.
2Reliability
If the fuel cell operates continuously during driving interruptions to reduce wear, then wear events are minimized, but energy management complexity increases
Solution Approach 1:
The electrical storage system acts as an intermediary between the fuel cell and the electric motor drive. It absorbs the fuel cell's continuous energy output during interruptions and releases energy during driving phases, simplifying the control strategy by decoupling the fuel cell operation from immediate propulsion demands.
Solution Approach 2:
The system dynamically adjusts the fuel cell's operating point and power output based on the state of charge of the electrical storage system and upcoming journey requirements. This dynamic control allows continuous operation while adapting to varying conditions, managing complexity through real-time optimization rather than fixed shutdown schedules.
3Object-affected harmful factors
If the fuel cell is kept running during journey interruptions, then the number of wear events is reduced, but energy supply requirements become more complex
Solution Approach 1:
The system employs periodic charging cycles during driving interruptions, where the fuel cell charges the electrical storage system in controlled intervals rather than maintaining constant maximum output. This periodic action reduces wear by avoiding sustained high-power operation while still accumulating sufficient energy for the next journey segment.
Solution Approach 2:
The control system adjusts key parameters such as fuel cell power output, charging rate, and operating point based on the duration and timing of driving interruptions. By changing these parameters dynamically, the system optimizes the balance between reducing wear events and meeting energy supply requirements for subsequent driving phases.
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
This approach significantly reduces the number of wear events on the fuel cell system, extending its lifespan and maintaining efficient operation by ensuring continuous charging during interruptions, thus reducing maintenance needs and operational costs.
Implementation Method 1
a fuel cell for supplying the electrical storage system
Data Source
AI summary
A method is for operating a utility vehicle which has an electric motor drive, an electrical storage system for supplying the electric motor drive and a fuel cell for supplying the electrical storage system, including the steps: controlling the fuel cell during the journey in such a manner that the charge level of the electric energy storage system is below its predetermined charge level when a driving interruption occurs, and continuing to control the fuel cell during the journey interruption until the electrical storage system has reached the predetermined charge level and/or the driving interruption has ended. A fuel cell system is for the method and a control unit and computer program product implement the method.