Patent ID: 8265857

Claim:
A controlling apparatus for an engine provided with: a variable operation angle mechanism that is provided for varying a valve operation angle of an engine valve driven by a camshaft, and is capable of varying a center phase of the valve operation angle in response to a variation in the valve operation angle; and a variable valve timing mechanism provided for varying a rotating phase of the camshaft relative to a crankshaft of the engine, the controlling apparatus comprising: a detecting unit that detects an operating state of the engine; a first calculating unit that calculates a target valve operation angle based on the operating state; a second calculating unit that calculates a target rotating phase based on the operating state; a correcting unit that corrects the target rotating phase based on the target valve operation angle; a first operating unit configured to calculate a first manipulated variable of the variable operation angle mechanism, based on the target valve operation angle, to thereby output the first manipulated variable; and a second operating unit configured to calculate a second manipulated variable of the variable valve timing mechanism, based on the target rotating phase corrected by the correcting unit, to thereby output the second manipulated variable, wherein the second calculating unit calculates, if the valve operation angle takes a reference value thereof, a target rotating phase which brings the center phase of the valve operation angle of the engine valve to approach a target center phase which is set depending on the operating state of the engine.