Fuel Cell Air Adsorber Impurity Estimation
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Solution Overview
Problem
Conventional methods for estimating the quantity of impurities adsorbed onto chemical filters in fuel cell systems are inaccurate due to variations in vehicle load and air supply, particularly at low velocities, leading to potential errors in determining filter lifetime.
Innovation Solution
A fuel cell system with an adsorber, measurement unit, detection unit, estimation unit, and output control unit to accurately measure air quantity, impurity concentration, and adsorption efficiency, enabling precise estimation of impurity adsorption quantities and timely filter replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the velocity coefficient method is used to estimate impurity adsorption quantity, then the estimation can be performed based on average velocity, but the estimation accuracy deteriorates when vehicle load varies independently of velocity (e.g., uphill running)
Solution Approach 1:
The patent changes the estimation parameters from velocity-based coefficients to direct measurements of air quantity and impurity concentration. Instead of using average velocity V1 and velocity coefficient V2, the system measures air quantity Q1 directly and impurity concentration G1, then calculates adsorption quantity using these actual operational parameters. This resolves the contradiction by maintaining ease of operation through direct measurement while improving accuracy by eliminating the indirect velocity-based estimation that fails under variable load conditions.
2Device complexity
If air quantity is estimated based on velocity correlation, then the system remains simple, but the estimation becomes inaccurate when intake air quantity does not correlate with velocity (e.g., during uphill operation)
Solution Approach 1:
The patent replaces the mechanical/physical correlation-based estimation system (velocity to air quantity) with a direct measurement system using sensors. Instead of relying on the mechanical relationship between velocity and air intake, the system uses an air quantity sensor to directly measure Q1 and a concentration sensor to directly measure G1. This substitution eliminates the reliability issue while maintaining system simplicity through direct sensing rather than complex calculation models.
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 configuration allows for accurate estimation of impurity adsorption quantities, reducing errors and ensuring appropriate filter replacement, thereby maintaining system efficiency and performance.
Implementation Method 1
The chemical filter includes activated carbon and the like, and adsorbs the impurity component onto the chemical filter to remove the impurity component
Data Source
AI summary
A fuel cell system having an adsorber placed in an air supply path to an air electrode of a fuel cell and receiving a chemical filter for adsorbing impurities contained in air; measurement means for measuring the amount per unit time of air having passed the adsorber; detection means for detecting the density of impurities contained in the air, whose volume has been measured by the measurement means, before it enters the adsorber; estimation means for estimating, based on the amount of the air, the density of the impurities, and adsorption efficiency of the chemical filter, the amount of the impurities adsorbed per unit time by the chemical filter; and output control means for causing a signal to output when an accumulated value of the amount of the impurity exceeds a predetermined level.