Patent ID: 7011053
Filing Date: 2006-03-14
Classification: F01L,F02D,Y02T

Abstract:
1. A controller for controlling opening and closing of an intake valve of an engine, the controller comprising: an electromagnetic actuator having a movable element coupled with the intake valve; a setting circuit for obtaining engine parameter signals of the engine and setting a target opening current based on the engine parameter signals obtained; a drive circuit for driving the electromagnetic actuator according to the target opening current; a determination unit operable to determine whether the setting circuit is in an abnormal state; and a correction unit operable to set the target opening current to a predetermined constant current as long as the determination by the determination unit indicates that the setting circuit is in the abnormal state, wherein the electromagnetic actuator generates a drive force approximately proportional to a magnitude of a drive current, and wherein the determination unit determines that the setting circuit is in the abnormal state when a magnitude of a level or a change of the level of an engine revolution number signal is abnormal.