Anode inlet unit for a fuel cell system

Abstract

A fuel cell system that employs one or more injectors in an anode inlet unit for providing hydrogen flow control to a fuel cell stack in the system. At a low flow rate, the duty cycle of one of the injectors is controlled and the other injectors are closed. As the flow rate requirements increase, the duty cycle of the first injector is increased until it is completely open. The duty cycles of the other injectors are then controlled in the same manner in succession. The anode inlet unit may include a valve for directing the hydrogen supply gas to other devices in the fuel cell system. Additionally, a valve can be provided in the unit that receives a flow of air to purge the anode side of the fuel cell stack.

Dependencies are inferred from the claim text.