INTAKE AND EXHAUST VALVE DRIVE CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To secure favourable detection precision of a rotational phase difference by a cam angle sensor by avoiding influence of rotational torque variation of a camshaft and to prevent abrasion, etc. SOLUTION: An operating angle of a suction valve 24 by a rotational phase difference between a drive shaft and a camshaft is controlled by changing relative angular velocity in accordance with concentric - eccentric oscillation of a control system 3 provided between the drive shaft 1 and the camshaft 2. An operation system 4 to control the above-mentioned control system has an electromagnetic pick up type cam angle sensor 30 to output an information signal to a controller 31 and is furnished with a projected part 32 for a pick-up of the cam angle sensor 30 between a first flange part 5 and a cam 2a of the camshaft. Additionally, the cam angle sensor 30 and the projected part 32 are set at a position where their pick-up point becomes the maximum point of a change of the above-mentioned rotational phase difference.