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Electronic in-line pump system (EIPS) is an electronic controlled fuel injection system which meets China's emission regulations. In this paper, a numerical model of EIPS was developed in AMESim for the purpose of creating a tool for simulation experiments. Experiments were conducted at the same model conditions to validate the model. The results are quite encouraging and in agreement with model predictions which imply that the model can accurately predict the dynamic injection characteristics of EIPS. The design of experiments was performed using a 2-level-5-factor face-centered central composite design (FCCD) method in order to study the interactive effect of factors on fuel injection quantity fluctuation (FIQF). The factors studied were supply fuel pressure, cam linear velocity, control valve lift, needle spring pretightening force and nozzle flow coefficient.

In this paper we have obtained real-time series of in-cylinder pressure by carrying out some experiments and studied the in-cylinder pressure cycle-to-cycle variations in a diesel engine. By using recurrence plot (RP) and recurrence quantification analysis (RQA), we have investigated the dynamical characteristics of combustion in diesel engine through the in-cylinder pressure cycle-to-cycle variations. The results show that the combustion process exhibits many chaotic features and deterministic nature, the qualitative and quantitative change in combustion can be easily related to patterns in recurrence plots (RPs) and RQA, and combustion system is sensitive to initial conditions. The conclusions of our research work may be helpful in developing effective control strategies to improve diesel engine performance.