Fuel Cell Controller Voltage Maintenance for Stack Durability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Frequent on and off operation of the key switch in industrial vehicles with fuel cell systems accelerates deterioration of the fuel cell stack and reduces energy efficiency due to repeated start and stop of electric power generation, especially when the voltage varies across the allowable range.
Innovation Solution
An industrial vehicle with a controller that manages the fuel cell system by starting power generation when the key switch is turned on, initiating voltage maintenance control when turned off for short periods, and completely stopping power generation when cycled off for long periods, maintaining cell voltage within allowable limits to prevent deterioration and conserve energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fuel cell system is controlled to start and stop electric power generation in conjunction with key switch operation, then the vehicle becomes operable when needed and inoperable when not needed, but the fuel cell stack deteriorates accelerated due to frequent voltage variations
Solution Approach 1:
The controller initiates voltage maintenance control before completely stopping power generation. When the key switch is turned OFF, the controller maintains cell voltages within the allowable range for a predetermined time period before stopping power generation. This preliminary action prevents voltage variations that would occur if power generation were stopped immediately, thereby protecting the fuel cell stack from accelerated deterioration while still allowing frequent key switch operations.
2Speed
If the air compressor is started frequently to supply air to the fuel cell stack, then power generation can be restarted quickly, but energy efficiency drops due to repeated large power consumption events
Solution Approach 1:
The voltage maintenance control is performed in advance before power generation is completely stopped. By maintaining cell voltages within the allowable range during this preliminary period, the system ensures that when power generation is restarted, the voltage conditions are already favorable, eliminating the need for frequent air compressor startups. This reduces energy consumption while maintaining quick restart capability.
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
Prevents fuel cell stack deterioration and maintains energy efficiency by minimizing voltage variations and reducing the need for frequent air compressor startups, ensuring the vehicle remains operational with reduced energy consumption.
Implementation Method 1
a fuel cell system configured to generate electric power by supplying hydrogen gas and air to the fuel cell stack and causing chemical reaction between the hydrogen gas and oxygen contained in the air
Data Source
AI summary
An industrial vehicle having a fuel cell system includes a vehicle key switch which has at least an ON position and an OFF position and is switchable between the ON position and the OFF position and a controller configured to control the fuel cell system in conjunction with manipulation of the key switch. When the controller detects that the key switch is turned from the OFF position to the ON position, the controller causes the fuel cell system to start electric power generation. When the controller detects that the key switch is turned from the ON position to the OFF position, the controller causes the fuel cell system to start a voltage maintenance control. When the controller detects that the key switch at the ON position is manipulated in a specified manner, the controller causes the fuel cell system to stop the electric power generation.