Patent ID: 7851099
Filing Date: 2010-12-14
Classification: H01M,Y02E

Abstract:
1. A fuel cell system, comprising: an accelerator pedal opening sensor; an atmospheric pressure sensor which detects an atmospheric pressure; a fuel cell having an anode electrode and a cathode electrode which generates electricity by supplying hydrogen to said anode electrode and a reaction gas to said cathode electrode; a back pressure valve located downstream of said cathode electrode; an anode gas supply device which supplies hydrogen to said anode electrode; a regulator located between said anode gas supply device and said anode electrode; a cathode gas supply device which includes a compressor using electric power generated by said fuel cell and supplies the reaction gas pressurized to said cathode electrode; an intake air temperature sensor which detects temperature of intake air to said compressor; a fluid communication circulation path for at least some hydrogen output gas from said anode electrode to combine between the regulator and the anode electrode with the hydrogen from the anode gas supply device being input to the anode electrode; a control device connecting to said accelerator pedal opening sensor, said atmospheric pressure sensor and said back pressure valve, said control device including a target pressure setting device and a correction device, said target pressure setting device setting a target value for cathode pressure of the pressurized reaction gas input to said cathode electrode, said control device computing a target generated current in accordance with an accelerator pedal opening detected by said accelerator pedal opening sensor, said target pressure setting device using a relationship between said target generated current and said target value for cathode pressure to set said target value so that maximum efficiency is reached at said target generated current, said correction device correcting said target value to a corrected target value in accordance with both of: said control device controlling the cathode pressure of said fuel cell to the corrected target value; and said regulator being operated in accordance with a pilot pressure input thereto from said reaction gas at the cathode pressure downstream of said compressor to regulate pressure of said hydrogen as an anode pressure before said hydrogen is supplied to said anode electrode, wherein both the cathode pressure and the anode pressure are corrected and controlled and wherein the hydrogen fed to the anode electrode at the anode pressure includes at least some hydrogen output gas via the circulation path.