Abstract: An apparatus and method for controlling hydrogen purging are provided. The hydrogen purging control apparatus includes a purge valve that is disposed at an outlet on an anode side of a fuel cell stack and is configured to adjust an amount of emission of hydrogen containing impurities. Additionally, a controller is configured to adjust an opening and closing cycle of the purge valve based on a required output or an output current of the fuel cell stack.

Abstract: A method for diagnosing a current sensor of a fuel cell system includes calculating an estimated duty value of a hydrogen pressure control valve, corresponding to a sensing value of the current sensor, while operating the fuel cell system. The estimated duty value is compared with an actual duty value where the hydrogen pressure control valve is controlled during the operation of the fuel cell system, thereby calculating an error value between the estimated duty value and the actual duty value. The error value is compared with a critical value in a normal range, thereby determining whether a failure occurs in the current sensor. The hydrogen pressure control valve controls a pressure of hydrogen supplied to a fuel cell stack of the fuel cell system.

Abstract: An emergency start method for a fuel cell-powered vehicle includes starting the vehicle and detecting an abnormal state of a power supply system of an air blower upon the start of the vehicle. If the power supply system of the air blower is in the abnormal state, an air-check valve of a fuel cell opens. Hydrogen is supplied to the fuel cell, and the air blower operates with power generated from the fuel cell and an emergency start system.

Abstract: A method and apparatus for controlling charge of a low-voltage battery are provided. The method includes assigning, by a controller, a preset voltage for the low-voltage battery based on an operating mode of a vehicle and a charge state of a high-voltage battery. In addition, the controller compares the preset voltage with a present charge voltage of the low-voltage battery and increases the present charge voltage with a first slope until the present charge voltage becomes equal to the preset voltage when the preset voltage is greater than the present charge voltage. The operating mode comprises drive modes that include a first drive mode and a second drive mode, a fuel cell stop mode, and an emergency mode. The first drive mode is divided into a plurality of stages based on the charge state of the high-voltage battery.

Abstract: An apparatus and a method for starting a fuel cell vehicle in an emergency by using the blower of an air conditioning system of the vehicle are disclosed. Thus, upon failure of a high voltage system including a high voltage DC-DC converter or a high voltage battery used as a power source of an air blower during start-up of a fuel cell, air is supplied to the fuel cell so as to be started in the emergency, thereby ensuring starting efficiency of the vehicle and security to the driver in the emergency.

Abstract: A system and method for emergency starting of a fuel cell vehicle is provided. In particular, a high-voltage converter, a balance of power (BOP), and a controller are included in the system. The high-voltage converter is configured such that one side thereof is connected to a high-voltage battery via a battery switch and the other side thereof is connected in parallel to a plurality of fuel cells. The BOP is connected in parallel to the high-voltage converter and the fuel cells. The controller is configured to control the power supplied from the high-voltage battery to the BOP without conversion by connecting the battery switch upon the failure of the high-voltage converter or high-voltage battery.

Abstract: An emergency start device of a fuel cell vehicle having a motor as a driving source is provided and includes a fuel cell that supplies power to a motor and an air blower that supplies air to the fuel cell. A high voltage battery supplies power to the air blower and a direct current (DC) converter increases an output of the high voltage battery to transfer the output to the air blower. In addition, a first switch transfers or intercepts an output of the high voltage battery to the air blower. By directly transferring a voltage of the high voltage battery to the air blower, the fuel cell is driven, when the DC converter fails while driving by the high voltage battery.

Abstract: The present invention provides a system and method for starting a fuel cell vehicle in an emergency, which can start the fuel cell by supplying necessary air to the fuel cell even in the event of a failure or malfunction of a high voltage system, the high voltage system including a high voltage DC-DC converter and a high voltage battery which are generally used as a power source of an air blower during start-up of the fuel cell. In particular, the present invention provides a system and method for starting a fuel cell vehicle in an emergency, in which a controller drives an air blower by a voltage output from a low voltage battery to start the fuel cell in an emergency, if it is determined that there is a failure or malfunction in the high voltage system during start-up of a fuel cell system.

Abstract: The present invention provides a system and method for starting a fuel cell vehicle in an emergency, which can start the fuel cell by supplying necessary air to the fuel cell even in the event of a failure or malfunction of a high voltage system, the high voltage system including a high voltage DC-DC converter and a high voltage battery which are generally used as a power source of an air blower during start-up of the fuel cell. In particular, the present invention provides a system and method for starting a fuel cell vehicle in an emergency, in which a controller drives an air blower by a voltage output from a low voltage battery to start the fuel cell in an emergency, if it is determined that there is a failure or malfunction in the high voltage system during start-up of a fuel cell system.