Method for noise reduction of aperture shift operation of digital operated solenoid valve in brake system of motor car, involves adjusting magnetic forces that are slightly larger than return force in one control time interval

摘要

The method involves adjusting magnetic forces (Fm1, Fm2), which act on an armature in valve opening directions, by electrical controllers of a valve coil. The magnetic forces work against return force (Fr) that acts on the armature in a valve closing direction. Aperture shift operation is divided into two control time intervals. The magnetic forces are considerably larger than the return force in one of the time intervals, and the magnetic forces are slightly larger than the return force and correspond to the return force in the other time interval. An independent claim is also included for a brake system.