MONITOR METHOD AND DEVICE OF MEASURED VALUE DETECTION IN ENGINE CONTROL

PROBLEM TO BE SOLVED: To minitor a measured value accurately without almost giving an influence to an engine control by making one input signal to a prescribed fixed basic voltage and reading the basic voltage to inspect the functional motion of a multiplexer and/or A/D converter. SOLUTION: A/D converter 12 is installed on the calculation element 10 in an electronic control unit 8 so as to control an output set element (throttle valve) 16. Meantime, in the control unit 8 for inputting the measured valve of a measuring device 20, the measured value is supplied to an input A1 through first/second resistances R1, R2 and the output of a comparator 24 is inputted to a line 22 connected between the resistances R1, R2. The comparator 24 outputs a signal in response to the comparison result between the divided voltage of resistances R3, R4 and a signal from the output Px of the calculation element 10. The divided voltage is also supplied to a multiplexer 32 for inputting the variable of an engine temperature and intake temperature and the measured value is monitored by supplying the output to A/D converter 12.