METHOD FOR MEASURING AND REGULATING THE OPERATING DATA OF A COMBUSTION ENGINE

摘要

The method enables to measure and/or regulate the operating data of a combustion engine, such as the contents of carbon black, the number of revolutions per minute of the engine, the start of the injection and the recycling of exhaust gases. The method utilizes the ionisation of gases at high temperatures and the electric conductibility of ionized gases contained in the engine combustion chamber is measured by detecting the component with the lowest ionization potential; measured electric signals are then evaluated to establish the operating data of the engine. This concerns preferably a diesel engine with which the contents of carbon black is the component with the lowest ionization potential. A detector is comprised of a ceramic preheating spark-plug which presents on its calotte situated in the combustion chamber an electric conducting layer which acts as an electrode whereas the walls of said chamber act as a second electrode. The contents of carbon black is directly measurable after integration of the signals and calibration, whereas the number of revolutions is obtained from the interval between the measurement signals. The method may be used to control the injection advance and also to regulate the recycling of exhaust gases.