Controlling electromagnetic valve, especially for motor vehicle automatic gearbox, involves varying pulse width modulated drive signal periodic duration depending on drive signal switch-on component

摘要

The electromagnetic valve control method involves a controller driving a coil (28) of the electromagnetic valve (17) with a pulse width modulated drive signal that's contain a variable periodic duration and a switch-on component. The periodic duration of the pulse width modulated drive signal is varied depending on the switch-on component of the drive signal.