Startup sequence control method of fuel cell-super capacitor hybrid electric vehicle

Abstract

The present invention provides a startup sequence control method of fuel cell-super capacitor hybrid electric vehicles, which can protect a fuel cell at the time of the starting of the fuel cell, reduce the start-up time and promote convenience of a driver in a fuel cell-super capacitor serial hybrid system which does not employ a high-voltage power converter. The startup sequence control method comprises the steps of: determining whether or not a low-voltage auxiliary battery is in a state where its voltage is less than a reference voltage or in a cold start condition after a key-on signal has been input; if the auxiliary battery is in the state where its voltage is less than a reference voltage or in the cold start condition, matching the voltage of a main bus terminal to the voltage of an auxiliary power source through the voltage boost of a power converter; turning on a relay for cutting off the voltage of the auxiliary power source and a main relay of a precharge unit for the auxiliary power source; and turning off the power converter and then driving a fuel cell auxiliary component using the auxiliary power source to thereby boost a fuel cell voltage.