Fuel injector preheating method for internal combustion engine, involves monitoring and evaluating current characteristic in coil of electromagnet to detect local current minima and/or current maxima caused by armature reactions

摘要

The method involves energizing a coil of an electromagnet before starting an internal combustion engine, where the electromagnet is provided for activating a valve of a fuel injector. A preheating voltage (42) is periodically applied to the coil of the electromagnet. Current characteristic (33) in the coil is monitored and evaluated for detecting local current minima (43) and/or current maxima (44) that are caused by armature reactions. An independent claim is also included for a device for preheating a fuel injector of an internal combustion engine.