THE CRANKSHAFT SPEED AS ENGINE DYAGNOSTIC AND CONTROL PARAMETAR

This paper presents some applications of a precise crankshaft speed measurement for engine diagnostics and control. The state of the art of measuring technique enables precise, non contacting measurement of crankshaft speed without necessity for serious engine modifications. Even more, modern engine management systems necessarily incorporate relatively inexpensive incremental crankshaft position sensor. Information, obtained by instantaneous crankshaft speed measurement could be use for an engine torque estimation as well as for an engine torque estimation as well as for an engine misfire or malfunction detection. It is possible to determine cylinder pressure by utilizing engine torque waveform, what is essential for engine control and optimization. Engine misfire detection is extremely important to fulfill the requirements of the OBDII regulation, which is obligated from 1996. in USA and similar regulation is also regulation is also obligated in Europe from 2000. diesel engine, crankshaft speed, cylinder pressure.