To improve the evacuation traveling performance in generation of abnormality in an electronic throttle control system.
When severe abnormality is generated, an abnormality storage element 116 is operated, to deenergize a load relay 105 for feeding, of a motor 104 for driving a throttle valve and to default return the throttle valve, and a warning/display unit 106a is operated to perform the evacuation traveling by reducing an upper limit engine rotating speed by controlling a fuel injection valve 137. As the reduced rotating speed, a lower limit threshold value N1 in stopping, a rotating speed Na approximately in proportion to the output of an accelerator position sensor, a rotating speed Nb approximately in inverse proportion to the output of a throttle position sensor, or a default threshold value rotating speed N2 is selected to perform various evacuation traveling.
NAKAMOTO KATSUYA
Toshihide Kodama
Takenaka Ikuo
Keigo Murakami