| 摘要 |
PURPOSE:To improve engine accelerating performance and to reduce the shocks caused at the time of accelerating an engine, by effecting feedback control instead of ''lean control'' even in a lean region in case that the rate of acceleration is great, i.e., the rate of change in a datum injection time is great. CONSTITUTION:A control circuit, which calculates and controls the quantity of injected fuel from the flow rate of intake air, engine speed, output signals of an O2-sensor, etc., executes calculation of the quantity of fuel to be increased when the throttle valve is fully opened (VL) at a step 42 in case that it is detected at a step 41 that the engine is operated under a high load and a datum injection time TP becomes greater than a maximum set value Tpn. Further, in case that it is detected at a step 44 that TP is greater than the datum injection time Tpalpha at a switching point to ''partial lean mode'', calculation for feedback control is executed at a step 45. During the ''lean mode'' when TP is smaller than Tpalpha, it is judged at a step 46 whether a small change DELTATP of the datum injection time exceeds a predetermined value X or not. In case of ''yes'', control is switched to feedback control at the step 45, whereby it is enabled to raise the characteristic curve of torque. |
