| 摘要 |
PURPOSE:To control the air-fuel ratio to target level by performing feedforward control under specific operating condition on the basis of operating condition and correction factor durig feedback control to theoretical air-fuel ratio under specific operating condition. CONSTITUTION:When the cooling water temperature TW is below 30 deg.C, a switching signal SC for selecting feedforward control is provided from a decision means 27 while injection amount TP2 is fed from feedforward control means 24 through switching means 26 to drive means 28 thereby the air-fuel ratio is feedforward controlled to rich level thus to stabilize the engine. Upon exceeding of cooling water temperature TW over 30 deg.C, feedforward control will perform rich air-fuel ratio control to produce sufficient torque. While feedback control for performing theoretical air-fuel ratio control under light or heavy load will obtain correction factor (a) on the basis of output VS from O2 sensor then obtain second correction factor (b) on the basis of (a) thus to control to the target level. |
