Patent ID: 6213446
Filing Date: 2001-04-10
Classification: F02M

Abstract:
An exhaust gas recirculation valve comprising:an inlet for recirculated exhaust gas,an outlet for supplying recirculated exhaust gas to an internal combustion engine,valve means for controlling communication between said inlet and said outlet, said valve means comprising a valve member, a seat for said valve member, a valve rod connected to said valve member and a head on said valve rod,means for moving said valve rod to control the valve member and regulate flow of the exhaust gas from said inlet to said outlet,said means for moving said valve rod including an arrangement for developing kinetic energy to impact against said head and free the valve member when stuck to the valve seat, said arrangement comprising an electromagnet including an armature having an initial position spaced from said head when the valve member is applied to said seat such that when said electromagnet is energized said armature undergoes movement to develop said kinetic energy and produce impact against said head, anda control system connected to said electromagnet to operate said electromagnet repetitively to cause said armature to hammer against said head to free the stuck valve.