Patent ID: 6877493

Claim:
A variable operation intake valve controlling apparatus for an internal combustion engine, comprising: a cam operational angle variable mechanism that is capable of controlling an operational angle of the intake valve in such a manner that a range of the operational angle is continuously changed; a cam phase variable mechanism that is capable of continuously displacing a phase of a lift center angle of the intake valve; and a controller for controlling an intake air quantity in accordance with valve timings of the intake valve determined according to the operational angle by means of the cam operational angle variable mechanism and the phase by means of the cam phase variable mechanism, the controller determining an allowable residual gas quantity from a required air quantity and an engine speed, the required air quantity being determined according to a manipulated variable of an accelerator, calculating optimum intake valve open and closure timings in such a manner that both of the required air quantity and the allowable residual gas quantity enter a cylinder of the engine, and determining the operational angle and the phase from the optimum intake valve open and closure timings.