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Based on a 1982 model passenger car powered by a 1490 cm3 4-cylinder engine, a concept car has been designed to achieve a substantial fuel economy improvement without sacrificing vehicle performance. The deisgn factors affecting the fuel efficiency of the engine and the vehicle were picked up and improved via experimental analyses. As the cumulative effects of the modifications implemented, the concept car has virtually achieved a fuel economy improvement goal of 40%. A simulation program was carried out to determine the fuel economy contribution of each design factor modified for incorporation in the concept car, thereby identifying the areas to be concentrated on for practical application.

A Direct Injection Stratified Charge Rotary Engine ( DISC-RE ) with a pilot flame ignition system has been studied to find the possibility of simultaneous reductions of fuel consumption rate and HC exhaust gas emissions. Firstly, combustion characteristics in a model combustion chamber, which simulates the DISC-RE were examined from the viewpoints of calculation and experiment. The high speed photography and the indicated pressure analysis were experimentally performed while numerical calculations of the mixture formation and combustion processes were also carried out. As a result, it has been found that the combustion using the pilot flame ignition system is much activated and a better ignitability is attained under lean mixtures than using a spark ignition system. Secondly, a single rotor with 650 cc displacement DISC-RE was built as a prototype. Combustion characteristics and its performance were tested using a combustion analyzer.