Fuel Cell Air Supply Control via Dynamic Power Calculation
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Solution Overview
Problem
Fuel cell vehicles experience reduced fuel efficiency and performance due to excessive air supply, which is calculated based on power rather than available power, leading to unnecessary air consumption.
Innovation Solution
A method for controlling air supply in fuel cell vehicles by calculating available power, motoring request power, and charging request power, and adjusting air flow based on stack request power to match actual power needs, thereby optimizing air supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If air supply quantity is increased to meet power demand, then power availability is improved, but fuel efficiency deteriorates due to excessive air consumption
Solution Approach 1:
The air supply control system dynamically adjusts the air supply quantity based on real-time operating conditions including current power demand, battery state of charge (SOC), and fuel cell stack temperature. The controller continuously modifies the air blower speed to match the actual air requirements, transitioning from static to dynamic control to eliminate excessive air supply while maintaining power availability.
Solution Approach 2:
The system implements feedback control by monitoring the battery SOC level and using it to determine the charging request power. The controller receives feedback on current power generation, air supply quantity, and battery status, then adjusts the air supply accordingly. This closed-loop feedback mechanism ensures air supply matches actual needs rather than providing excessive supply.
2Reliability
If air supply quantity is increased to ensure sufficient oxygen for electrochemical reaction, then fuel cell performance is improved, but air supply losses increase due to excessive air
Solution Approach 1:
The system applies partial action by supplying only the necessary amount of air required for the current power demand and battery charging needs, rather than providing excessive air supply. The controller calculates the precise air requirement based on stack request power and adjusts the air blower to deliver only that amount, eliminating the waste associated with excessive air supply while maintaining sufficient oxygen for electrochemical reactions.
Solution Approach 2:
The system changes the air supply parameter (air flow rate) dynamically based on operating conditions. The controller adjusts the air supply quantity parameter in response to changes in power demand, battery SOC, and fuel cell temperature, ensuring the parameter matches actual requirements rather than remaining fixed or excessive.
3Power
If air supply quantity is increased to meet calculated power requirements, then power delivery capability is improved, but fuel efficiency deteriorates due to unnecessary air consumption
Solution Approach 1:
The controller performs preliminary calculation of the required air supply quantity based on predicted power needs, battery SOC, and stack temperature before actually supplying the air. By pre-calculating the precise air requirement based on available power and charging demands, the system avoids the delay and inefficiency of reactive air supply adjustments, maintaining both power delivery capability and fuel efficiency.
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 reduces air supply losses, improves fuel efficiency, and maintains performance by ensuring only the necessary air is supplied to the fuel cell, preventing excessive air drying and maintaining consistent fuel cell performance.
Implementation Method 1
hydrogen ions are separated by catalytic reaction in the anode
Implementation Method 2
the hydrogen ions and electrodes separated in the anode electrochemically react with oxygen in the negative electrode, thereby obtaining electric energy
Implementation Method 3
the air supply system actuates an air blower to supply external air to a cathode of the stack
Data Source
AI summary
A method for controlling an air supply of a fuel cell vehicle is provided. In particular, an air supply of a fuel cell vehicle is controlled by calculating an available power which is currently being used by a vehicle; calculating a motoring request power from a driving motor, based on the calculated available power and power required by the driving motor; calculating stack request power required in the fuel cell based on a required charging request power and the calculated motoring request power, depending on a state of charge (SOC) of a high voltage battery; and controlling the air supply to the fuel cell depending on the calculated stack request power.