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The authors have proposed a model to simulate the processes that occur in a SI direct injection engine. The modelling of the engine’s cycle consists of: the presentation of the initial data, the computer program, the calculus and the correlation between the expressions of the engine’s parameters and the gasoline injection in order to realize the computational program. The proposed cycle is a helpful one for computer simulation of the gasoline direct injection. The computer simulation enables the determination of the proposed theoretical technical-economic parameters, the theoretical mechanical work, the coefficients corresponding to adjust the indicated diagram, the theoretical mean pressure, the theoretical efficiency and the theoretical specific fuel consumption. After calculating the mechanical losses, the effective theoretical technical-economic parameters are also determined.

theoretical mean pressure; theoretical efficiency; theoretical fuel consumption; gasoline direct injection; indicated diagram