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This paper is describes the progress of the development of continuous variable valve timing mechanism by the combination of the three-dimensional cam and the moving rocker arm, and the performance of 4 cylinder gasoline engine with this mechanism. This continuous valve timing mechanism is very concise. Through the trial product's experiment, it proved to be reliable. Furthermore, engine performance demonstrated high torque and low fuel consumption in wide engine speed range.

This paper is described the performance of VVT using engine cycle simulation software and the verification of compression ignition combustion in practical engine. It was predicted by engine cycle simulation that the control of high temperature EGR by the application of VVT improved thermal efficiency markedly by compression ignition combustion. A trial VVT is applied to an actual engine, and compression ignition combustion is realized.