Driving device of e.g. linear solenoid valve used for controlling automatic transmission of vehicle, determines difference between terminal points of current application duration and position duration where current is pressurized

摘要

The drive device supplies an electric current to a coil of the solenoid valve using an actuating signal (DRx). The difference between terminal point of current application duration (sound) and terminal point of the position duration (Tbase) where the current is pressurized is determined. If the difference value is not larger, the current application duration is subtracted from the position duration to obtain delay duration (Tcs) and a halt pulse train signal, based on the terminal points of crest current application duration (Tp) and start point of near position cycle.