Electro-valve for control of purging component of fuel system in IC engine

摘要

The control of the valve current reduces the noise caused by valve operation.- DETAILED DESCRIPTION - The control process includes the use of an electro-valve with a valve plate subject to a spring urging it in a first direction against a stop. The plate is moved in a second direction by the effect of a magnetic field generated by a coil. The coil is supplied with control current in a cyclical pattern whose duration is at least equal to the time (T0-T2) required for the displacement of the valve plate from its first stopped position to its second open position. The current is reduced in strength during the latter part of this period (T1-T2) as the valve approaches its second position