Combustion Process in a Spark Ignition Engine: Analysis of Cyclic Maximum Pressure and Peak Pressure Angle

TL;DR

This study investigates cycle-to-cycle variations in maximum pressure and peak pressure angle in a spark ignition engine, analyzing how spark advance angles influence fluctuations and randomness to inform better combustion control strategies.

Contribution

The paper introduces a detailed analysis of pressure fluctuations and their randomness in relation to spark advance angles, providing insights for optimizing engine performance.

Findings

Significant differences in pressure fluctuations depending on spark advance angle

Multiscale entropy reveals varying levels of randomness in pressure signals

Insights can guide development of improved combustion control strategies

Abstract

In this paper we analyze the cycle-to-cycle variations of maximum pressure $p_{max}$ and peak pressure angle $\alpha_{pmax}$ in a four-cylinder spark ignition engine. We examine the experimental time series of $p_{max}$ and $\alpha_{pmax}$ for three different spark advance angles. Using standard statistical techniques such as return maps and histograms we show that depending on the spark advance angle, there are significant differences in the fluctuations of $p_{max}$ and $\alpha_{pmax}$. We also calculate the multiscale entropy of the various time series to estimate the effect of randomness in these fluctuations. Finally, we explain how the information on both $p_{max}$ and $\alpha_{pmax}$ can be used to develop optimal strategies for controlling the combustion process and improving engine performance.