Unit for controlling electronically controlled throttle valve

A control unit for detecting an opening of an accelerator (14) and an opening of the throttle valve (3) to operate the throttle valve (3) via a motor (4), sets a commanded value of an opening of the throttle valve (3) at each of first predetermined cycles. A first opening/closing velocity is set in accordance with the set commanded value, a present opening of the throttle valve (3) is read at each of second cycles shorter than the first predetermined cycles, the motor (4) is rotated to follow a first predicted opening of the throttle valve (3) until the opening of the throttle valve (3) is smaller than the commanded value by a predetermined quantity, and the motor (4) is then caused to follow a second predicted opening of the throttle valve smaller than the first predicted opening of the throttle valve (3).