Electronic throttle controller

An electronic throttle controller comprising:

• a throttle valve for opening/closing an air intake passage which is communicated with a cylinder of an internal combustion engine;
• an actuator for changing an opening degree of the throttle valve;
• a throttle position sensor for sensing the opening degree of the throttle valve;
• an air intake amount sensor for sensing an amount of air which is sucked to the cylinder of the internal combustion engine;
• a first throttle opening degree control means for driving the actuator based upon deviation between the throttle opening degree sensed by the throttle position sensor and a target control value which is set in correspondence with a drive condition of the internal combustion engine so as to perform a feedback control operation for controlling the opening degree of the throttle valve;
• a second throttle opening degree control means operated in such a manner that when the air intake amount sensed by the air intake amount sensor is smaller than a stall prevention judging value which is set in correspondence with the drive condition of the internal combustion engine, the actuator is driven while neglecting the feedback control operation by the first throttle opening degree control means so as to perform an engine stop avoiding control for controlling to further open the opening degree of the throttle valve along the valve opening direction;
• and
• an abnormal condition detecting means for detecting an abnormal condition as to at least one of the throttle valve, the actuator, and the throttle position sensor when an execution frequency of the engine stop avoiding control by the second throttle opening degree control means per unit time is larger than, or equal to an abnormal condition judging value.