Abstract: The present invention provides an improved fuel efficiency measuring system for a fuel cell vehicle which simplifies various valves and hydrogen lines and modulizes its individual elements. More specifically, the present invention provides an improved fuel efficiency measuring system for a fuel cell vehicle that eliminates a purging hydrogen tank previously used for removing residual air in a hydrogen supply line and instead removes residual air in a hydrogen supply line by using a vehicle side hydrogen tank. Additionally, the present invention simplifies couplers installed in a hydrogen supply line, and considerably reduces manufacturing costs by eliminating a high-cost break-away coupler adapted to couple a fuel efficiency measuring unit and the vehicle side.

Abstract: A fuel efficiency measurement system includes a fuel supply tank for supplying hydrogen to be used as a fuel to a fuel cell of the vehicle during measurement of fuel efficiency and a precision electronic balance for detecting a weight of the fuel supply tank so as to perform the measurement of fuel efficiency based on a vehicle driving distance and a change in weight of the fuel supply tank measured by the electronic balance during measurement of fuel efficiency. According to the fuel efficiency measurement system, it is possible to more accurately calculate fuel efficiency without using hydrogen of a hydrogen tank installed in the vehicle.

Abstract: A fuel cell vehicle includes a stack that generates electrical energy by a fuel gas, a blower that blows air into the stack, an air cut-off valve that is mounted on an air supply line, a bypass line diverged between the air cut-off valve and the blower and having an end portion that is opened, a bypass valve that is mounted on the bypass line, and a control portion that closes the air cut-off valve and opens the bypass valve upon detecting an off signal for idle engine stop or a signal for turning off the engine. Therefore, if the fuel cell vehicle is in an idle stop condition, the blower supplying the stack with air stops operating, and simultaneously the bypass line is opened and the air cut-off valve is closed such that the air supplied to the stack can be securely cut off.

Abstract: A fuel efficiency measurement system includes a fuel supply tank for supplying hydrogen to be used as a fuel to a fuel cell of the vehicle during measurement of fuel efficiency and a precision electronic balance for detecting a weight of the fuel supply tank so as to perform the measurement of fuel efficiency based on a vehicle driving distance and a change in weight of the fuel supply tank measured by the electronic balance during measurement of fuel efficiency. According to the fuel efficiency measurement system, it is possible to more accurately calculate fuel efficiency without using hydrogen of a hydrogen tank installed in the vehicle.