Fuel Cell Valve Duty Control for Startup Noise and Stress
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fuel cell systems experience strange noise generation and mechanical component stress due to sudden pressurization during startup, which existing vibration-preventing measures inadequately address, and can also lead to damage to the electrolyte membrane from excessive pressure differences between hydrogen and air supply pressures.
Innovation Solution
A fuel cell system with a valve device and control system that adjusts the opening area of the valve based on pressure differences to gradually reduce downstream pressure, using open/close or variable opening solenoid valves to control gas flow and prevent sudden pressurization, and optionally employing parallel passages with different pressure losses to manage pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high pressure hydrogen is supplied to the hydrogen supply pipe during startup, then the fuel cell system can begin operation, but sudden pressurization causes strange noise and mechanical component stress
Solution Approach 1:
The control device opens the valve device in advance before high-pressure hydrogen supply begins, and maintains it open during the pressurization process. This preliminary action allows the downstream side to be ready to receive pressure gradually, preventing sudden pressurization shocks that cause noise and mechanical stress while still enabling the system to start up effectively
Solution Approach 2:
The control device monitors the gas pressure in the hydrogen supply pipe and adjusts the valve device opening area based on real-time pressure feedback. When pressure increases, the valve opening is controlled to increase continuously or intermittently, creating a closed-loop control system that prevents sudden pressurization while maintaining productivity
2Loss of time
If the valve opening is increased rapidly to supply hydrogen quickly, then startup time is reduced, but pressure difference across electrodes increases causing electrolyte membrane damage
Solution Approach 1:
The valve device opening area is dynamically adjusted during the startup process rather than being fixed. The control device continuously or intermittently increases the opening area in response to pressure conditions, allowing the system to balance startup speed with membrane protection by adapting the valve position in real-time
Solution Approach 2:
The opening area parameter of the valve device is changed continuously or intermittently based on pressure conditions. This parameter change allows the system to control the rate of pressure increase, preventing excessive pressure differences across the electrolyte membrane while still achieving startup within acceptable timeframes
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
Effectively suppresses the generation of resonance and mechanical component stress during startup and operation, while protecting the electrolyte membrane by maintaining controlled pressure differences between the anode and cathode electrodes, thereby enhancing system durability and reducing noise.
Implementation Method 1
a solenoid (25) having a coil wound around a core and an armature movable in the axial direction of the core in response to magnetic attraction of the coil
Implementation Method 2
a fuel cell that generates power upon receiving a supply of a reactive gas and discharges a reactive offgas
Data Source
AI summary
At the startup of a fuel cell system comprising a fuel cell that generates power upon receiving a supply of a reactive gas and discharges a reactive offgas, a gas passage in which the reactive gas or the reactive offgas flows, a valve device that is installed on the gas passage, and a control device that controls the opening of the valve device, the downstream pressure of the valve device is first acquired (step S3) and, when the downstream pressure is equal to or less than a predetermined pressurization termination pressure (step S5: 'YES'), the valve device is duty-controlled by means of a predetermined duty ratio (step S7, step S9). As a result, the generation of strange noise and the generation of mechanical component stress that arise from sudden pressurization are suppressed.