Diesel engine control on engine-stop

Abstract

On stopping a diesel engine, an amount of fuel injected on engine-stop control is made reduced slowly after the engine is manipulated to be stopped, thereby suppressing vibration or shock, which might otherwise occur owing to sudden engine stall. With an ignition key as an operating means turned off, an engine control mode enters a mode of beginning the engine-stop control, where an amount of fuel injected on the engine-stop control is selected to reduce slowly with a time that has elapsed since the ignition was off. Thus, the engine is less subject to sudden stall and kept from vibration and shock resulting from the engine-stop. The instant the engine rpm Ne lowers below a preset engine rpm Ne1, an intake-throttle valve control mode starts to throttle an amount of admitted air correspondingly to the reduction of the amount of fuel injected on the engine-stop control, thereby eliminating undesirable burning owing to undue excess-air factor.

Dependencies are inferred from the claim text.