Hydrogen Pressure Sensor Error Compensation in Fuel Cell Systems
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Solution Overview
Problem
In vehicle fuel cell systems, hydrogen pressure sensors experience errors during operation, leading to inaccurate hydrogen supply control, which affects energy efficiency, fuel efficiency, and durability of the fuel cell stack.
Innovation Solution
A method involving a controller that checks the opening ratio of the hydrogen pressure regulation valve using a data map, detects multiple measurement values at different valve openings, and compares them with pre-stored normal pressure values to correct errors, including pressure offset and gradient errors, thereby maintaining optimal hydrogen supply and improving sensor accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydrogen pressure sensor is used to control hydrogen supply pressure, then hydrogen supply control is enabled, but sensor error occurs during operation leading to inaccurate control
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors the opening ratio of the pressure regulation valve and compares it with expected values. When a deviation is detected, the system adjusts the valve opening ratio to compensate for sensor errors, creating a closed-loop control system that maintains accurate hydrogen supply pressure despite sensor drift.
Solution Approach 2:
The patent changes the operating parameters of the pressure regulation valve dynamically. By adjusting the valve opening ratio based on feedback from the pressure sensor and comparing it with predetermined maps or expected values, the system adapts to sensor errors and maintains accurate pressure control through parameter optimization.
2Power
If hydrogen supply pressure is increased to increase stack current, then power generation increases, but energy efficiency and fuel efficiency deteriorate
Solution Approach 1:
The patent employs dynamic control of the hydrogen pressure regulation valve opening ratio based on real-time operating conditions. The controller adjusts the valve opening dynamically according to the stack current requirements, using feedback mechanisms to optimize the balance between power generation and energy efficiency, preventing excessive pressure increases.
Solution Approach 2:
The patent applies partial action by precisely controlling the hydrogen supply pressure to match exactly what is needed for the required stack current. Instead of using excessive pressure to ensure sufficient hydrogen supply, the system uses feedback control to apply only the necessary pressure, thereby maintaining energy efficiency while achieving the desired power output.
3Loss of energy
If hydrogen supply pressure is decreased to improve energy efficiency, then fuel efficiency improves, but stack durability deteriorates dramatically
Solution Approach 1:
The patent uses feedback control to continuously monitor the pressure regulation valve opening ratio and compare it with expected values from predetermined maps. When sensor errors cause pressure to drop below safe levels, the feedback mechanism detects the deviation and adjusts the valve opening to restore appropriate pressure, preventing durability damage while maintaining fuel efficiency.
Solution Approach 2:
The patent implements beforehand cushioning by using predetermined maps and feedback mechanisms to anticipate and prevent pressure conditions that would harm stack durability. The system maintains a safety buffer by comparing real-time valve opening ratios with expected values and making corrective adjustments before dangerous pressure levels are reached.
4Measurement precision
If hydrogen pressure regulation valve opening ratio is adjusted frequently to maintain precision, then control accuracy improves, but system complexity increases
Solution Approach 1:
The patent employs periodic action by checking the valve opening ratio at specific intervals or under specific conditions (such as during purge operations or when operating point changes occur). This approach maintains control accuracy by adjusting the valve opening ratio periodically or event-driven rather than continuously, reducing computational burden and system complexity while preserving precision.
Data Source
AI summary
A method of correcting error of hydrogen pressure sensor of vehicle fuel cell system, may checking, whether an opening ratio of a hydrogen pressure regulation valve is in a normal range by use of data map; checking whether a hydrogen purge valve is opened when the opening ratio of the hydrogen pressure valve is not within the normal range; changing the opening ratio of the hydrogen pressure regulation valve at least one time when the hydrogen purge valve is determined as being opened, and detecting two or more measurement values of the hydrogen pressure sensor at two or more different opening ratios of the hydrogen pressure regulation valve; and comparing, the two or more measurement values of the hydrogen pressure sensor detected at the two more opening ratios, respectively with predetermined pressure values corresponding to the opening ratios, and correcting errors between the measurement values and the predetermined pressure values.