Patent ID: 6105551
Filing Date: 2000-08-22
Classification: F01L,F02D

Abstract:
A revolution speed control apparatus for an internal combustion engine having a camshaft, comprising:a three-dimensional cam provided on the camshaft of the internal combustion engine, the three-dimensional cam having a cam surface that contacts a cam follower drivingly connected to a valve, the three-dimensional cam having a cam profile that varies continuously along a rotational axis of the three-dimensional cam;a valve lift varying actuator capable of continuously varying a valve lift of the valve by adjusting a position of the camshaft along the rotational axis of the three-dimensional cam, the valve lift of the valve caused by the three-dimensional cam;an adjustment amount detector that detects an amount of adjustment provided by the valve lift varying actuator;an allowable revolution speed setter that determines an allowable revolution speed of the internal combustion engine based on an amount of adjustment detected by the adjustment amount detector,an engine revolution speed detector that detects a revolution speed of the internal combustion engine; andan engine revolution speed reducer that reduces the revolution speed of the internal combustion engine if the revolution speed detected by the engine revolution speed detector is greater than the allowable revolution speed set by the allowable revolution speed setter.