Patent ID: 7032570

Claim:
An electronic throttle control device for an engine, comprising: a throttle valve for adjusting a suction air amount of the engine; a throttle opening degree detecting unit for detecting an opening degree of the throttle valve and generating an analog opening degree detection signal whose magnitude corresponds to the opening degree of the throttle valve; and a throttle valve control block for controlling the opening degree of the throttle valve, the throttle valve control block is constructed by commonly using a microcomputer for carrying out other control operation for the engine, wherein the throttle valve control block includes a processing load judging means for judging a processing load status of the microcomputer, an AD converting means for converting the analog opening degree detection signal and outputting a digital opening degree detection signal at an output point, and a throttle valve control means for controlling the opening degree of the throttle valve on the basis of a digital opening degree target signal to the throttle valve and the digital opening degree detection signal, and the AD converting means has a first conversion mode in which the analog opening degree detection signal is converted to the digital opening degree detection signal with high conversion precision, and a second conversion mode in which the analog opening degree detection signal is converted to the digital opening degree detection signal with low conversion precision lower than the first conversion mode, and the first and second conversion modes are switched by the processing load judging means.