Patent ID: 8190354

Claim:
A fuel efficiency measurement system for a fuel cell vehicle equipped with a fuel cell that uses hydrogen as a fuel, the system comprising: a fuel supply tank configured to supply hydrogen to be used as a fuel to the fuel cell; a main pipe which has an inlet end connected to a hydrogen supply pipe coupled to an outlet valve of the fuel supply tank and an outlet end connected to a hydrogen injection pipe of the vehicle such that hydrogen from the fuel supply tank is supplied to the hydrogen injection pipe; a high pressure regulator provided on the main pipe configured to reduce the pressure of hydrogen supplied from the fuel supply tank to a pressure that can be used in the fuel cell; a plurality of valves provided on the main pipe; a hydrogen discharge pipe connected to an excess flow valve of the fuel supply tank to discharge hydrogen at an excess pressure of the fuel supply tank to the outside when the excess flow valve is opened; an electronic balance configured to detect a weight of the fuel supply tank; and a system control unit configured to receive a detection value based on the weight of the fuel supply tank from the electronic balance, communicate with a power control unit in a state where the system is connected to the vehicle, and control the overall operation of various valves in the system and the vehicle and the overall operation of the system, wherein the system control unit calculates fuel efficiency based on a vehicle driving distance transmitted from the power control unit and a difference between weights of the fuel supply tank before and after driving the vehicle, detected by and transmitted from the electronic balance.