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Method for remedial action in the event of the failure of the primary air flow measurement device in a fuel cell system
Method for remedial action in the event of the failure of the primary air flow measurement device in a fuel cell system
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机译:在燃料电池系统中主空气流量测量装置发生故障时采取补救措施的方法
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摘要
A system and method for controlling the speed of a compressor in the event that an airflow meter that measures the airflow from the compressor to the cathode input of the stack fails. When a failure of the airflow meter is detected, an algorithm first deactivates the primary feedback control algorithms used to control cathode pressure and flow, and sets the cathode exhaust valve to a fully open position. The speed of the compressor is controlled by an open loop set-point and the airflow from the compressor is estimated by a model using compressor discharge pressure and the compressor speed. The cathode by-pass valve position is determined by calculating the difference between the requested cathode airflow and the modeled compressor output flow. The position of the by-pass valve is then adjusted using the valve characteristics and the compressor discharge pressure. The estimated airflow to the stack is used to control the maximum stack current.
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