| 摘要 |
An intake pressure detecting device for detecting the intake pressure in an intake pipe 11 as information for controlling the operational state of an engine comprises an intake pressure detecting sensor 12 for detecting the absolute pressure of the intake air, a reference voltage power supply 13 for supplying a prescribed reference voltage Vref, a differential amplifier 14 for amplifying the differential between the output voltage Vin from the intake pressure detecting sensor 12 and the reference voltage Vref of the reference voltage power supply 13, an A/D converter 15 for converting the analogue signal k.DELTAV output by the differential amplifier 14 to a digital signal, and the like. Thereby, the intake pressure can be detected to a high degree of accuracy in a two-cycle engine, for example, which has a relatively low intake negative pressure, whilst achieving cost reductions.
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