Patent ID: 8481218
Filing Date: 2013-07-09
Classification: B60K,H01M,Y02E

Abstract:
1. A fuel cell system for a fuel cell vehicle, comprising: a hydrogen exhaust line provided at an anode outlet of a fuel cell stack; a hydrogen purge valve provided in the hydrogen exhaust line; an outlet line as a part of the hydrogen exhaust line at a rear end of the hydrogen purge valve, the outlet line exhausting purge hydrogen discharged by the hydrogen purge valve to an air exhaust line at a cathode outlet of the fuel cell stack; an inlet line branched from the outlet line and exhausting purge hydrogen to an air supply line at a cathode inlet of the fuel cell stack; a vehicle state detector for detecting a vehicle state; a controller for outputting a control signal for selecting either the cathode outlet or the cathode inlet of the fuel cell stack as an exhaust path of purge hydrogen based on the vehicle state detected by the vehicle state detector; and a valve means capable of being opened and closed by a control signal of the controller to open one of flow paths of the inlet line and the outlet line such that purge hydrogen is discharged to either the cathode outlet or the cathode inlet of the fuel cell stack, wherein the valve means comprises a first valve provided in the inlet line and a second valve provided in the outlet line, the inlet line is connected to either a front end or a rear end of a membrane humidifier or to either a front end or a rear end of an air blower in the air supply line at the cathode inlet of the fuel cell stack, and the outlet line is connected to either the front end or the rear end of the membrane humidifier in the air exhaust line at the cathode outlet of the fuel cell stack.