| 摘要 |
PURPOSE:To provide satisfactory responsive property and driveability even in a lot of correction control of air-fuel ratio during acceleration and warming-up by providing a second electromagnetic valve for controlling the air-fuel ratio during the acceleration and warming-up running separately from a valve for feedback controlling by an oxygen sensor. CONSTITUTION:A running zone is divided into 16 kinds of zones depending on the rotational frequency of an engine and the opening of a throttle valve 8. The choice of air-fuel ratio depends upon open loop control or feedback control by detecting the running condition of either starting mode or stationary mode. And in each mode of starting, warming-up, inertness, power and deceleration, the open loop control process is selected. After acceleration correction, a main fuel electromagnetic valve 14, a slow fuel electromagnetic valve 18 and a jet fuel electromagnetic valve 22 are controllably driven with duty ratio by the running mode to control the air-fuel ratio of mixture. Also, by controlling the time of keeping acceleration correction duty in proportion to the ratio of changing opening of a throttle valve 8 is improved driveability. |
