Patent ID: 8166935

Claim:
A control system of an internal combustion engine configured providing a valve camshaft provided with a valve drive cam for driving operation of a valve provided in a cylinder of the internal combustion engine with a pump drive cam so as to drive a fuel pump of the internal combustion engine, the system changing an operating timing of said valve provided in a cylinder of said internal combustion engine, wherein the control system has a device inhibiting the operating timing from being returned in a direction reverse to the direction of the targeted operating timing during change of the operating timing and relative rotational phases of said valve drive cam and said pump drive cam are set considering, for changing the operating timing in a direction of a targeted operating timing, utilization of a composite reaction torque of a valve operation drive reaction torque acting on said valve camshaft along with a driving operation of a valve provided in a cylinder of said internal combustion engine and a fuel pump drive reaction torque acting on said valve camshaft along with a driving operation of said fuel pump.