Method and device for measuring fuel injection timing

摘要

Method and device for measuring injection timing are designed to reduce the operation load and the amount of calculation required for determination of injection timing relative to the TDC. A reference position signal is generated at a predetermined crank angle within the range of 30 DEG CA to 90 DEG CA prior to the TDC. CA signals from a CA sensor are used as main increments and signals of another kind are used as fine increments to measure a period from generation of the reference position signal to generation of an injection signal by an injection valve lift sensor and another period from generation of the reference position signal to generation of a TDC signal. The injection timing relative to the TDC can simply be determined as a difference between the two periods.