| 摘要 |
PURPOSE:To improve follow-up ability of control by providing plural integrated circuits having different time constants in parallel and changing amplitude of an intake pipe pressure signal by the integrated circuit selected by either of a throttle valve position or an engine rotational speed or by both. CONSTITUTION:A pressure sensor 4 is connected to a downstream side of the throttle valve 3 of an intake pipe 2 to transmit an electric signal from the sensor 4 to an electronic control unit 5. In the electronic control unit 5, plural integrated circuits A1-A5 whose time constants are mutually different are provided in parallel on an interface portion and these are input to a CPU8 through an A/D converter 7 selectively by a multiplexer 6. The multiplexer 6 makes selective control according to the output of a valve opening sensor 9 and an engine rotational speed sensor 10. Then when the engine running condition is changed and intake pipe pressure is changed, an amplitude of a wave shape too obtaining the means value of the intake pipe pressure is changed so as to input an information well capable of following sudden change to the CPU8.
|
