Patent ID: 8580449
Filing Date: 2013-11-12
Classification: H01M,Y02E

Abstract:
1. A fuel cell system, which performs low-efficiency electrical power generation that generates power by setting an air amount to be supplied with a fuel cell at an air amount that is less than an air amount during a normal drive operation, comprising: a command value computation portion programmed to compute a command current value and command voltage value for the fuel cell during low-efficiency electrical power generation based on a required power; an air concentration overvoltage target value computation portion programmed to estimate a reference voltage value for the fuel cell when the command current value is taken to be a reference current value based on a reference current—voltage characteristic defined in the normal drive operation, and compute the difference between the reference voltage value and the command voltage value as an air concentration overvoltage target value; an air stoichiometric ratio computation portion programmed to compute the air stoichiometric ratio based on a one-dimensional mapping of the air concentration overvoltage target value and the air stoichiometric ratio; and an air amount computation portion programmed to compute an air amount during the low-efficiency electrical power generation, based on the air stoichiometric ratio.