HYDROGEN PURGING DEVICE AND METHOD FOR FUEL CELL SYSTEM

摘要

A hydrogen purging device and method for a fuel cell system are provided in which the opening/closing of a hydrogen purge valve is variably controlled based on a purge charge amount depending on an operating state of a fuel cell in the fuel cell system to improve the hydrogen utilization factor of the fuel cell, system efficiency, hydrogen circulation performance, and the like. The hydrogen purging device includes an operating state detector that detects an operating state of a fuel cell stack and a controller that determines an opening time of a hydrogen purge valve based on information regarding the stack operating state detected by the operating state detector. The controller then outputs a control signal to open the hydrogen purge valve. When the hydrogen purge valve is opened the hydrogen purging of the fuel cell stack is performed in response to the control signal output from the controller.

主权项

1. A hydrogen purging device for a fuel cell system, comprising:
an operating state detector configured to detect an operating state of a fuel cell stack; and a controller configured to:
determine an opening time of a hydrogen purge valve based on information regarding the stack operating state detected by the operating state detector;output a control signal to open the hydrogen purge valve; andperform hydrogen purging of the fuel cell stack when the hydrogen purge valve is opened, wherein the controller is configured to:
obtain, at every predetermined accumulation period, a variable purge charge amount that corresponds to a current stack operating state from a map′calculate a charge amount for a time period the accumulation period using a predetermined reference purge charge amount;perform accumulation by accumulating the calculated charge amount every accumulation period; anddetermine the opening time of the hydrogen purge valve by comparing the accumulated charge amount with the reference purge charge amount.