G0700-1-3 Study on thermal Efficiency improvement of Diesel Engine by Using Variable Valve Timing System

Abstract

Since the expansion ratio of Miller cycle is longer than the compression ratio, energy in the working gas can be converted into more work, and sequentially benefits improving the thermal efficiency of the engines. In this study, we applied the Miller cycle to a diesel engine by delaying the timing of IVC (Intake Valve Close), and investigated effects and factors of the improvement of thermal efficiency by thermodynamic calculations and experiments.