Comparative Study of In-cylinder Pressure Sensors for Combustion Engine Feedback Control

摘要

Developing more sensitive controls for internal combustion engines to meet increasingly strict emission limits is becoming an urgent task, especially for automotive engines. Pressure-sensing systems could be important components of such controls, especially since recent advances have reduced their costs, and increased both their durability and the available options. For these reasons three different types of pressure sensor (one piezo-resistive, one fiber optic and one gasket-type) were installed and evaluated in a single cylinder SI-engine, using a water-cooled piezoelectric pressure sensor as a reference system. In addition, heat release analysis and pressure ratio management strategies were explored to compare the potential utility of different combustion phasing measures. This paper describes the key findings and discusses their implications.