Patent ID: 8151764

Claim:
An engine control system comprising: an electronic throttle control system having a throttle valve and an actuator for driving the throttle valve, so that the throttle valve is controlled by the actuator in accordance with a target opening degree for the throttle valve; a target value calculating means for calculating a target value for an intake air amount or an intake pipe pressure; a target opening degree calculating means for calculating a target opening degree of the throttle valve; and a presumed value calculating means for calculating a presumed value for the intake air amount or the intake pipe pressure, which can be realized by the calculated target opening degree, wherein the target opening degree calculating means calculates the target opening degree of the throttle valve based on a deviation between the target value calculated by the target value calculating means and the presumed value calculated by the presumed value calculating means, wherein the presumed value calculating means calculates the presumed value for the intake air amount or the intake pipe pressure, based on a target opening degree of the throttle valve, to which a motion restriction is applied with respect to a control for the throttle valve, and wherein the presumed value calculating means calculates the presumed value for the intake air amount or the intake pipe pressure, based on the target opening degree of the throttle valve, to which the motion restriction is applied, wherein a delay of response in an intake air system is taken into consideration, and the target opening degree calculating means comprises: a calculating means for calculating a deviation between the target intake pipe pressure and the presumed intake pipe pressure; a compensating means for compensating the deviation for the intake pipe pressure to an advancing side by an amount corresponding to the delay of the response in the intake air system; a calculating means for calculating an intake air amount passing through the throttle valve, based on the deviation compensated in the advancing side and the presumed intake air amount; a calculating means for calculating a throttle opening degree based on the calculated intake air amount passing through the throttle valve, such that the intake air amount passing through the throttle valve is realized by the throttle opening degree; and a calculating means for calculating the target opening degree for the throttle valve by applying a motion restriction to the calculated throttle opening degree.