Abstract: A method and system for maintaining stability of a system of a fuel cell vehicle are provided to prevent malfunction of sensors of a low voltage DC-DC converter and the respective controllers. A start timing of a fault diagnosis for the low voltage DC-DC converter and the respective controllers is determined and a deviation between voltages of the sensors of the low voltage DC-DC converter and the respective controllers is detected to determine whether the low voltage DC-DC converter and the respective controllers fail.

Abstract: A method and system for controlling a fuel cell vehicle are provided. The method includes determining, by a controller, a driving pattern of a driver based on driving information including acceleration and deceleration information. A condition for activation of an idling-stop of a fuel cell is then set based on the determined driving pattern and the fuel cell is stopped from generating electric energy when the condition for activation of the idling-stop is satisfied.

Abstract: A method and system for controlling a fuel cell vehicle are provided. The method includes determining, by a controller, a driving pattern of a driver based on driving information including acceleration and deceleration information. A condition for activation of an idling-stop of a fuel cell is then set based on the determined driving pattern and the fuel cell is stopped from generating electric energy when the condition for activation of the idling-stop is satisfied.

Abstract: A method and system for maintaining stability of a system of a fuel cell vehicle are provided to prevent malfunction of sensors of a low voltage DC-DC converter and the respective controllers. A start timing of a fault diagnosis for the low voltage DC-DC converter and the respective controllers is determined and a deviation between voltages of the sensors of the low voltage DC-DC converter and the respective controllers is detected to determine whether the low voltage DC-DC converter and the respective controllers fail.

Abstract: An apparatus for compensating for torque of a fuel cell electric vehicle includes: a storage configured to store a first look-up table in which pedal amount correction coefficients corresponding to degradation rates of a fuel cell stack are recorded and a second look-up table in which torques corresponding to pedal amounts are recorded; a degradation rate calculator configured to calculate a degradation rate based on a maximum voltage and an output voltage of the fuel cell stack; a correction coefficient searcher configured to search for a correction coefficient corresponding to the calculated degradation rate using the first look-up table; a pedal amount detector configured to detect a pedal amount indicating a degree to which an acceleration pedal is pressed; and a torque compensator configured to compensate for torque by compensating for the detected pedal amount based on the searched correction coefficient using the second look-up table.

Abstract: An apparatus for controlling a converter includes: a failure detector that detects failure of a sensor included in an input or output side of the converter, a substitution factor calculator that calculates a substitution factor based on a measurement value of a sensor in a high voltage battery connected to an input side of the converter when failure is detected in the sensor of the input side by the failure detector and calculates the substitution factor based on measurement values of a sensor connected to one or more loads when failure is detected in the sensor of the output side, and an emergency operation controller that controls an operation in a constant current or constant voltage scheme based on the calculated substitution factor.

Abstract: An apparatus for compensating for torque of a fuel cell electric vehicle includes: a storage configured to store a first look-up table in which pedal amount correction coefficients corresponding to degradation rates of a fuel cell stack are recorded and a second look-up table in which torques corresponding to pedal amounts are recorded; a degradation rate calculator configured to calculate a degradation rate based on a maximum voltage and an output voltage of the fuel cell stack; a correction coefficient searcher configured to search for a correction coefficient corresponding to the calculated degradation rate using the first look-up table; a pedal amount detector configured to detect a pedal amount indicating a degree to which an acceleration pedal is pressed; and a torque compensator configured to compensate for torque by compensating for the detected pedal amount based on the searched correction coefficient using the second look-up table.

Abstract: A method for controlling an air supply of a fuel cell vehicle is provided. In particular, an air supply of a fuel cell vehicle is controlled by calculating an available power which is currently being used by a vehicle; calculating a motoring request power from a driving motor, based on the calculated available power and power required by the driving motor; calculating stack request power required in the fuel cell based on a required charging request power and the calculated motoring request power, depending on a state of charge (SOC) of a high voltage battery; and controlling the air supply to the fuel cell depending on the calculated stack request power.

Abstract: A method for controlling an air supply of a fuel cell vehicle is provided. In particular, an air supply of a fuel cell vehicle is controlled by calculating an available power which is currently being used by a vehicle; calculating a motoring request power from a driving motor, based on the calculated available power and power required by the driving motor; calculating stack request power required in the fuel cell based on a required charging request power and the calculated motoring request power, depending on a state of charge (SOC) of a high voltage battery; and controlling the air supply to the fuel cell depending on the calculated stack request power.

Abstract: The present invention provides a hybrid fuel cell system that is configured to determine if an idle stop condition has been satisfied during a normal operation mode of the hybrid fuel cell system, cut off air supply to a fuel cell to stop power generation of the fuel cell and reduce a voltage which the fuel cell outputs in response to determining that the idle stop condition has been satisfied. The voltage of a bidirectional converter, connected between a battery and a bus terminal is reduced and the output of the fuel cell is controlled, based on a first predetermined value and maintained at that first predetermined value. Subsequently, the battery is charged via the output current of the fuel cell generated by maintaining the reduced voltage of the bidirectional converter.

Abstract: The present invention provides a fuel cell hybrid system having a multi-stack structure, which maintains the voltage of a fuel cell at a level lower than that of an electricity storage means (supercapacitor) during regenerative braking so that the fuel cell does not unnecessarily charge the electricity storage means, thereby increasing the amount of recovered energy and improving fuel efficiency.

Abstract: The present invention provides a method for controlling output of a fuel cell to improve fuel efficiency of a fuel cell hybrid vehicle, in which the fuel cell is operated at a constant power at a maximum efficiency point, wherein the fuel cell and a storage means are directly connected if the output and energy of the storage means is insufficient, and the power generation of the fuel cell is stopped when the level of energy of the storage means is increased during stopping or during low power operation such that the fuel cell is intensively operated at the maximum efficiency point, thus improving the fuel efficiency of the fuel cell and the efficiency of the fuel cell system.

Abstract: The present invention provides a separator for a fuel cell, in which a water discharge hole such as a venturi tube or a water discharge means including a metal plate for condensing water is provided on a land of the separator being in contact with a gas diffusion layer (GDL) of a fuel cell so that water generated by a reaction is easily discharged from the GDL through the water discharge means.

Abstract: The present invention provides a power configuration system for a fuel cell hybrid vehicle and a method for controlling the same, in which a second blocking diode is installed in a main bus terminal at an output terminal of a fuel cell (in front of a first blocking diode) separately from the existing first blocking diode installed in the main bus terminal, the positions of high voltage components for driving the fuel cell are changed from the rear of the first blocking diode to the front of the first blocking diode, and the operations of the high voltage components are appropriately controlled during regenerative braking such that the voltage of the fuel cell may be maintained below that of the supercapacitor.

Abstract: The present invention provides a hybrid fuel cell system that is configured to determine if an idle stop condition has been satisfied during a normal operation mode of the hybrid fuel cell system, cut off air supply to a fuel cell to stop power generation of the fuel cell and reduce a voltage which the fuel cell outputs in response to determining that the idle stop condition has been satisfied. The voltage of a bidirectional converter, connected between a battery and a bus terminal is reduced and the output of the fuel cell is controlled, based on a first predetermined value and maintained at that first predetermined value. Subsequently, the battery is charged via the output current of the fuel cell generated by maintaining the reduced voltage of the bidirectional converter.

Abstract: The present invention provides a current collector of an end plate for a fuel cell and a method for controlling the same, in which a plurality of current collector plates having different resistance values is mounted on an end plate so that the current of a fuel cell is consumed during cold start and during low power operation to improve cold startability of the fuel cell and, further, the durability of a membrane electrode assembly (MEA) is improved due to an increase in voltage during low power operation.

Abstract: The present invention provides an idle stop-start control method of a fuel cell hybrid vehicle including a fuel cell as a main power source and a storage means as an auxiliary power source, in which air and hydrogen supply is cut off during low power operation where the efficiency of the fuel cell is low and during regenerative braking such that residual oxygen and hydrogen are consumed to drop the voltage of a fuel cell stack, thus stopping the operation of the fuel cell.

Abstract: The present invention provides a separator for a fuel cell, in which a water discharge hole such as a venturi tube or a water discharge means including a metal plate for condensing water is provided on a land of the separator being in contact with a gas diffusion layer (GDL) of a fuel cell so that water generated by a reaction is easily discharged from the GDL through the water discharge means.

Abstract: The present invention provides a fuel cell hybrid system having a multi-stack structure, which maintains the voltage of a fuel cell at a level lower than that of an electricity storage means (supercapacitor) during regenerative braking so that the fuel cell does not unnecessarily charge the electricity storage means, thereby increasing the amount of recovered energy and improving fuel efficiency.

Abstract: The present invention provides a current collector of an end plate for a fuel cell and a method for controlling the same, in which a plurality of current collector plates having different resistance values is mounted on an end plate so that the current of a fuel cell is consumed during cold start and during low power operation to improve cold startability of the fuel cell and, further, the durability of a membrane electrode assembly (MEA) is improved due to an increase in voltage during low power operation.