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Ultra-low energy consumption and ultra-low emission vehicle technologies have been developed by combining petroleum-alternative clean energy with a hybrid electric vehicle (HEV) system. Their component technologies cover a wide range of vehicle types, such as passenger cars, delivery trucks, and city buses, adsorbed natural gas (ANG), compressed natural gas (CNG), and dimethyl ether (DME) as fuels, series (S-HEV) and series/parallel (SP-HEV) for hybrid types, and as energy storage systems (ESSs), flywheel batteries (FWBs), capacitors, and lithium-ion (Li-ion) batteries. Evaluation tests confirmed that the energy consumption of the developed vehicles is 1/2 of that of conventional diesel vehicles, and the exhaust emission levels are comparable to Japan's ultra-low emission vehicle (J-ULEV) level.

To achieve high-accuracy measurements of fuel consumption in testing on natural gas vehicles, a method for measuring the absolute value of fuel consumption by the gravimetric method using certificated reference weights and an electric platform scale has been developed. By performing a flow-meter test and a chassis dynamometer test using the gravimetric method, the measurement accuracy of the value of fuel flow rate and fuel consumption obtained by the fuel flow meters, carbon balance method, and air-to-fuel ratio method was evaluated. As a result, a highly accurate method for measuring fuel consumption in chassis dynamometer tests has been confirmed.