Systems and methods for controlling a compressor recirculation valve

摘要

Systems and methods to control compressor recirculation of a reactant in a fuel cell system. A recirculation valve flow setpoint value for a gas flow to the recirculation valve is calculated based on a received cathode flow setpoint. A value corresponding to a predicted recirculation valve position is generated, and can be used as a control command for changing the position of the recirculation valve to reduce the valve response time during operational transients of the fuel cell system.

主权项

1. A method for controlling fuel cell system cathode stoichiometry during an operational transient with a compressor recirculation valve, the method comprising:
identifying an operational transient in a fuel cell stack; receiving a stack cathode flow setpoint for gas flow supplied by an outlet of a compressor to a cathode of said fuel cell stack; calculating a recirculation valve flow setpoint value for said supplied gas flow using compressor operational data and said stack cathode flow setpoint; calculating a feedforward term corresponding to a new recirculation valve position by using said recirculation valve flow setpoint value; generating a feedback term corresponding to said new recirculation valve position through a PID control strategy based on an error between said stack cathode flow setpoint and said feedback term; and generating a recirculation valve control command based on said feedforward term and said feedback term that causes actuation of said recirculation valve to maintain cathode stoichiometry during said operational transient.