Throttle valve control device of internal combustion engine

A throttle valve control device of an internal combustion engine for use in a motor vehicle, comprising:

• a first control system which controls a throttle valve in accordance with movement of an accelerator pedal;
• a second control system which, upon a traction control of the vehicle, enforcedly pivots, with an aid of an electric actuator, the throttle valve in a direction to reduce the open degree thereof irrespective of operation of said first control system;
• an accelerator position sensor for issuing a first signal which represents the operation position of said first control system;
• an actuator position sensor for issuing a second signal which represents the operation position of said electric actuator;
• first means for deriving a first open degree of the throttle valve from said first signal;
• second means for deriving a second open degree of the throttle valve from said second signal;
• and
• third means for selecting a smaller one from said first and second open degrees of the throttle valve,
• wherein said second control system is operated in accordance with both said second signal and the selected smaller open degree of the throttle valve.