Fuel Cell Power Control via Cathode Dynamics Modeling
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Solution Overview
Problem
Existing power control methods for fuel cell systems in vehicles suffer from poor dynamics and inaccuracies in power delivery, leading to substantial overshoots or undershoots, as they fail to consider the power requirements of auxiliary drives and media supply dynamics effectively.
Innovation Solution
A method that considers the power requirements of both the fuel cell system and auxiliary drives, such as an air compressor, by using a model of cathode dynamics to match the control variables with media dynamics, ensuring precise and dynamic power delivery. This involves determining the expected power from auxiliary drives using a characteristic field based on variables like power, pressure, and temperature, and adjusting the media supply accordingly to maintain high control quality and reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the requested power is drawn immediately from the fuel cell, then the power response is fast, but the media supply cannot adapt leading to extreme loading and poor dynamics
Solution Approach 1:
The patent applies preliminary action by pre-adapting the media supply (air and hydrogen) to the requested power level before the fuel cell is fully loaded. The media mass flows are adjusted in advance based on the power request, ensuring that when the fuel cell delivers the requested power, the media supply is already optimized, preventing extreme loading conditions and enabling fast response with maintained reliability.
2Loss of energy
If the power control optimizes overall efficiency, then energy utilization is improved, but the dynamics crucial for vehicle drives deteriorates
Solution Approach 1:
The patent applies dynamics by making the media supply adaptive and dynamic rather than static. The media mass flows are continuously adjusted based on the requested power and actual operating conditions, allowing the system to respond quickly to power demands while maintaining optimal efficiency. This dynamic adaptation enables both fast power response and energy efficiency to coexist.
3Reliability
If the maximum current is limited to protect the fuel cell, then the fuel cell operation is safe, but the media supply dynamics are not considered leading to poor vehicle dynamics
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the media supply to match the requested power level before the fuel cell current reaches its maximum. By adapting the air and hydrogen mass flows in advance, the system enables the fuel cell to deliver maximum current safely without overwhelming the media supply, thus protecting the fuel cell while maintaining excellent vehicle dynamics.
Data Source
AI summary
A method for power control of a fuel cell system in a vehicle is disclosed. The requested fuel cell system power by the vehicle is converted into a power request made of the fuel cell by an expected power of auxiliary drives of the fuel cell system at the requested fuel cell system power being added to the requested fuel cell system power. A media supply of the fuel cell which corresponds to the power request made of the fuel cell is requested. The electrical loading of the fuel cell with current is performed in accordance with a model of the cathode dynamics such that a control variable of the control operation is matched to the media dynamics, and the power release is performed such that the fuel cell is loaded only when the adequate media supply is ensured.