INTAKE PRESSURE SENSING DEVICE FOR INTERNAL COMBUSTION ENGINE

An intake pressure sensor for sensing the intake pressure in an intake pipe (11) used as information for controlling the operation of an engine comprises an intake pressure sensor (12) for sensing the absolute intake pressure, a reference voltage power supply (13) for supplying a predetermined reference voltage Vref. A differential amplifier (14) for amplifying the difference between the output voltage Vin from the intake pressure sensor (12) and a reference voltage Vref from the reference voltage power supply (13), and an A/D converter (15) for converting an analog signal k.delta V outputted from the differential amplifier (14) to a digital signal.