Unit for controlling electronically controlled throttle valve

A control unit of an internal combustion engine, the control unit comprising:

• an accelerator opening sensor for detecting a value corresponding to an opening of an accelerator in accordance with an amount of depression of an acceleration pedal;
• a throttle-valve opening sensor for detecting an opening of a throttle valve disposed in a suction passage of the engine;
• a motor for opening and closing the throttle valve in accordance with the value corresponding to the accelerator opening and the value corresponding to the throttle-valve opening;
• commanded value setting means for setting a commanded value of the opening of the throttle valve in accordance with the accelerator opening value;
• first controlled variable setting means for setting a first controlled variable of the throttle valve in accordance with the commanded value;
• second controlled variable setting means for setting a second controlled variable in accordance with the first controlled variable of the throttle valve when the difference between a present opening of the throttle valve and a previous opening of the throttle valve is smaller than a predetermined value;
• and
• controlled variable output means for outputting the first and second controlled variables to the motor for opening the throttle valve until the opening reaches the commanded value.