Patent ID: 7560182

Claim:
A reaction gas supply apparatus for a fuel cell comprising: a compressor that supplies pressurized air to a cathode electrode of a fuel cell; a hydrogen supply device that supplies hydrogen to an anode electrode of the fuel cell; a control device that controls said compressor according to an operating state of the fuel cell to regulate an air pressure of the cathode electrode; a regulator that is applied with the air pressure of said cathode electrode as a reference pressure, and regulates a supply pressure to said anode electrode based on said air pressure; an air injector that is capable of regulating the reference pressure that is applied to said regulator, by discharging air from an air flow passage for the air pressure that is applied to said regulator; a second air flow passage connected to said air flow passage; a regulator pressure sensor provided on said air flow passage; and an atmospheric pressure sensor; wherein said air flow passage has an orifice on an upstream side of said air injector and in proximity to said air injector; said regulator regulates an outlet pressure with respect to an applied regulating pressure to a predetermined value, with an atmospheric pressure as a reference; said second air flow passage branches from said air flow passage on a downstream side of said orifice and said regulator pressure sensor; said air injector is provided on said second air flow passage; said control device is connected at least to said regulator pressure sensor and said atmospheric pressure sensor and configured so as to control an opening of said air injector according to detection signals obtained from said regulator pressure sensor and said atmospheric pressure sensor; and a feedforward control amount of said opening of said air injector is calculated in accordance with the atmospheric pressure.