Abstract
One of main issues in rotation measurement of engine crankshaft is angular error. We evaluated the effect of the error using a prototype crank angle reference unit which can be mounted on the engine. In order to reduce the angular error, “Equal division averaging method” was applied. Application of the new measurement technique resulted in reduction of the maximum error to about 2.3[mdeg.]. The method with the prototype unit was then applied to a real engine. The correlation between rotation measurement and in-cylinder pressure is reported.
