Patent ID: 7722970

Claim:
A method of controlling a fuel cell vehicle comprising a fuel cell, which generates electrical energy by electrochemical reaction of a reactant gas and outputs the electrical energy to a rotating load, a rechargeable energy storage, a switching mechanism, which electrically connects said fuel cell to said rotating load and said energy storage, or electrically disconnects said fuel cell from said rotating load and said energy storage, a DC-DC converter connected to said energy storage, and a control unit which measures an input voltage and an output voltage of the DC-DC converter, said method comprising the steps of: determining whether regeneration by said energy storage is performed or not; and during entire period of regeneration by said energy storage, placing said DC-DC converter in a direct connection mode wherein the DC-DC converter does not adjust voltage and the rotating load and the energy storage are directly connected electrically to each other, for directly charging regeneration electrical energy from said rotating load to said energy storage without voltage adjustment by the DC-DC converter.