Cylinder head temperature determination using high-speed phosphor thermometry in a fired internal combustion engine

Abstract

This paper documents the application of high-speed phosphor thermometry to measure cylinder head temperatures under fired engine conditions. The thermographic phosphor Gd3Ga5O12:Cr,Ce was synthesized with a special composition to meet the requirements of the measurement technique and the device under test. Calibration measurements are given in the first section, providing the temperature lifetime characteristic and temporal standard deviations in order to quantify single-shot precision. Accuracy was investigated for laser-induced heating. Measurements inside an optically accessible combustion engine are presented in the second section. Measurement locations at the cylinder head were determined, as well as temperature evolutions for variations in spark timing and air–fuel ratio.