Patent ID: 6626146
Filing Date: 2003-09-30
Classification: F02D,Y02T

Abstract:
An electromagnetic valve drive apparatus of an internal combustion engine, comprising:valve-opening first electromagnetic coils provided for a plurality of valves for a plurality of cylinders; plurality of valve-closing second electromagnetic coils provided for the plurality of valves; a mechanism that holds the plurality of valves in a closed state without using an electromagnetic force; and a drive circuit provided for the first and second electromagnetic coils, wherein the drive circuit is provided collectively for a valve group of the plurality of valves, the valve group including first valves having a first open period and perform identical operations and at least one second valve having a second open period does not overlap the first open period of the first of valves, and wherein the drive circuit includes a plurality of series circuits, each series circuit formed by connecting a plurality of switching elements in series, the plurality of series circuits are connected in parallel between a high electric potential side terminal and a low electric potential side terminal, and wherein the plurality of series circuits are connected by the first and second electromagnetic coils provided for the first valves and at least one second valve of the valve group.