FUEL CELL SYSTEM, AND CONTROL METHOD FOR FUEL CELL SYSTEM

摘要

A fuel cell system includes: a fuel cell supplied with fuel gas for power generation; a fuel supply flow passage flowing fuel gas, supplied from a fuel supply source, to the fuel cell; a pressure regulating valve regulating a pressure of fuel gas flowing through the fuel supply flow passage; a fuel circulation flow passage returning gas, emitted from the fuel cell, to the fuel supply flow passage; a circulation pump delivering gas in the fuel circulation flow passage to the fuel supply flow passage; an emission valve emitting gas in the fuel circulation flow passage to an outside; and a control device controlling the pressure regulating valve, the circulation pump and the emission valve such that the sum of losses of crossover hydrogen, circulation pump power and purge hydrogen is minimum while a hydrogen stoichiometric ratio required for power generation of the fuel cell is ensured.

主权项

1. A fuel cell system comprising:
a fuel cell that is supplied with fuel gas to generate electric power; a fuel supply flow passage that flows fuel gas, supplied from a fuel supply source, to the fuel cell; a pressure regulating valve that regulates a pressure of fuel gas that flows through the fuel supply flow passage; a fuel circulation flow passage that returns gas, emitted from the fuel cell, to the fuel supply flow passage; a circulation pump that delivers the gas in the fuel circulation flow passage to the fuel supply flow passage; an emission valve that emits the gas in the fuel circulation flow passage to an outside; and a control device that controls the pressure regulating valve, the circulation pump and the emission valve such that a sum of an amount of hydrogen that permeates from an anode of the fuel cell to a cathode of the fuel cell, an amount of hydrogen used to generate the electric power corresponding to a power loss of the circulation pump and an amount of hydrogen emitted through the emission valve is minimum while a hydrogen stoichiometric ratio required for the fuel cell to generate the electric power is ensured.