FAULT DIAGNOSIS METHOD FOR INJECTORS OF INTERNAL COMBUSTION ENGINE HIGH-PRESSURE INJECTION SYSTEMS

摘要

A method consisting in successively supplying the injector coils (L1, L2) for a predetermined time by closing the respective switch (S1, S2); discharging the supplied coil into a storage capacitor (12); measuring the charge of the storage capacitor following discharge of the coil; and comparing the measured charge value with a predetermined threshold. A short-circuit test is first performed by supplying each coil for a very short time interval, to prevent the current flow from damaging the control circuit (1) in the event of short-circuiting, and by determining the measured charge is below a first threshold. Subsequently, an open-circuit test is performed by supplying each coil for a longer time interval, and by determining the measured charge is above a second threshold.