Patent ID: 6578534
Filing Date: 2003-06-17
Classification: F01L

Abstract:
A variable valve operating system of an internal combustion engine comprising:a drive shaft adapted to be rotatably supported on an engine body and to rotate about an axis in synchronism with rotation of a crankshaft of the engine; a control shaft adapted to be rotatably supported on the engine body; an actuator driving the control shaft to adjust an angular position of the control shaft; an intermediate member that rotary motion of the drive shaft is converted into either of rotary motion and oscillating motion of the intermediate member, a center of the motion of the intermediate member with respect to the engine body varying depending on the angular position of the control shaft; the intermediate member linked to an intake valve of the engine, for lifting the intake valve responsively to the motion of the intermediate member, a valve lift characteristic of the intake valve being varied depending on a change in the center of the motion of the intermediate member; a position sensor attached to the engine body to generate a sensor signal indicative of the angular position of the control shaft; the position sensor having a directivity for an error contained in the sensor signal owing to a change in relative position between a center of the control shaft and the position sensor, the error becoming a minimum value in a specified direction of the relative position change; and the specified direction of the relative position change being set to be substantially identical to a direction of a line of action of load acting on the center of the control shaft during idling.