Patent ID: 6615775
Filing Date: 2003-09-09
Classification: F01L

Abstract:
A variable valve operating system of an internal combustion engine comprising:a variable lift and working angle control mechanism that enables both a lift and a working angle of an engine valve to be continuously simultaneously varied depending on engine operating conditions including at least an engine speed; a variable phase control mechanism that enables a phase at a maximum valve lift point of the engine valve to be varied depending on the engine operating conditions; a first sensor that detects an actual control state of the variable lift and working angle control mechanism every sampling time intervals TS1; a second sensor that detects an actual control state of the variable phase control mechanism every sampling time intervals TS2; at least one of the sampling time interval TS1 for the first sensor and the sampling time interval TS2 for the second sensor having a characteristic that the one sampling time interval varies relative to the engine speed; and a rate of change in the sampling time interval TS1 for the first sensor with respect to the engine speed being different from a rate of change in the sampling time interval TS2 for the second sensor with respect to the engine speed.