Abstract: An insulation resistance detection apparatus includes a processor configured to separate a fuel cell from a high voltage battery depending on an insulation resistance value of a vehicle during driving of the vehicle, and then to measure an insulation resistance value of the fuel cell to determine whether it is a failure of the fuel cell or a failure of the high voltage battery, and when it is the failure of the fuel cell, to determine a cause of the failure by calculating an insulation resistance variation; and a storage configured to store data and algorithms driven by the processor.

Abstract: A fault diagnostic apparatus for a fuel cell electric vehicle and a method therefor are provided. The apparatus includes: a main relay connected to a fuel cell stack; a power converter connected to the main relay; a heater relay connected to the fuel cell stack and the main relay at one end and connected to a cathode oxygen depletion (COD) heater at the other end; and a fuel cell control unit (FCU) connected with the main relay, the power converter, and the heater relay. The FCU diagnoses a fault of the main relay based on an amount of change in stack voltage according to control to turn off and on the heater relay and a power of the power converter according to variable control of a voltage of the power converter, when the vehicle enters a shutdown sequence, and outputs the diagnosed result.

Abstract: A hydrogen supply system for a fuel cell and a control method thereof includes a fuel cell, a hydrogen supply line connected to an inlet side of an anode of the fuel cell and supplying hydrogen to the fuel cell, a hydrogen supply pressure sensor configured for measuring pressure of the hydrogen supply line, and a controller electrically connected to the hydrogen supply pressure sensor and configured for deriving a correction value of the hydrogen supply pressure sensor, supplying hydrogen after air supply is cut off during an operation of the fuel cell, measuring a pressure variation of the hydrogen supply line, and determining whether to use a correction value of the hydrogen supply pressure sensor based on the measured pressure variation.

Abstract: An exemplary embodiment of the present disclosure provides an insulation resistance detection apparatus including a processor configured to separate a fuel cell from a high voltage battery depending on an insulation resistance value of a vehicle during driving of the vehicle, and then to measure an insulation resistance value of the fuel cell to determine whether it is a failure of the fuel cell or a failure of the high voltage battery, and when it is the failure of the fuel cell, to determine a cause of the failure by calculating an insulation resistance variation; and a storage configured to store data and algorithms driven by the processor.

Abstract: A fault diagnostic apparatus for a fuel cell electric vehicle and a method therefor are provided. The apparatus includes: a main relay connected to a fuel cell stack; a power converter connected to the main relay; a heater relay connected to the fuel cell stack and the main relay at one end and connected to a cathode oxygen depletion (COD) heater at the other end; and a fuel cell control unit (FCU) connected with the main relay, the power converter, and the heater relay. The FCU diagnoses a fault of the main relay based on an amount of change in stack voltage according to control to turn off and on the heater relay and a power of the power converter according to variable control of a voltage of the power converter, when the vehicle enters a shutdown sequence, and outputs the diagnosed result.

Abstract: A method of preventing surge for a vehicle may include detecting, by a controller, whether tip-out of an accelerator pedal is detected, comparing, by the controller, a difference value, obtained by subtracting an exhaust pressure from an intake pressure in a combustion chamber of an engine, with a predetermined reference value when the tip-out of the accelerator pedal is detected, driving, by the controller, a supercharger disposed at the rear end portion of a turbocharger at a predetermined number of revolutions per minute, which is lower than a normal number of revolutions per minute, when the difference value is greater than the reference value, and opening a bypass valve, which performs opening or closing operation and is disposed in a bypass line that diverges from an upstream point of the supercharger and is connected to a downstream point of the supercharger.

Abstract: A method of preventing surge for a vehicle may include detecting, by a controller, whether tip-out of an accelerator pedal is detected, comparing, by the controller, a difference value, obtained by subtracting an exhaust pressure from an intake pressure in a combustion chamber of an engine, with a predetermined reference value when the tip-out of the accelerator pedal is detected, driving, by the controller, a supercharger disposed at the rear end portion of a turbocharger at a predetermined number of revolutions per minute, which is lower than a normal number of revolutions per minute, when the difference value is greater than the reference value, and opening a bypass valve, which performs opening or closing operation and is disposed in a bypass line that diverges from an upstream point of the supercharger and is connected to a downstream point of the supercharger.