Control apparatus for internal combustion engine

摘要

A control apparatus for internal combustion engine which controls running of an internal combustion engine by use of a microcomputer, and which is provided with a signal processing circuit with a higher operating voltage than that of the microcomputer and a control circuit which invalidates an output of the signal processing circuit or lowers the control level in response to this output when the voltage of the signal processing circuit becomes to have a predetermined low value. Even if the voltage of the signal processing circuit becomes so low that a wrong signal should be outputted, there occurs no disadvantage in running control of the internal combustion engine.