Apparatus for controlling fuel injection and swirl motion of air in internal combustion engine

Claim 1

A fuel-injected internal combustion engine comprising: a fuel injection valve disposed in an intake passage which communicates with a combustion chamber by way of an intake valve; a spark generating means disposed at an upper portion of the combustion chamber above a piston; a swirl controlling device for controlling a swirling motion to be given to intake air in the circumferential direction of the cylinder forming the combustion chamber; a control device which, at least at low load, controls the fuel injection valve to inject fuel by an amount required for one power stroke of a predetermined time after the intake valve is opened and during the intake stroke, and controls the swirl controlling device to give intake air a swirling motion in the circumferential direction of the cylinder forming the combustion chamber so as to depress a disturbance of the intake air in the moving direction of the piston and to stratify the fuel introduced into the combustion chamber in the latter half of the intake stroke in the vicinity of the spark generating means; and a correction means for overriding said control device when the engine is cold for controlling the fuel injection valve to start fuel injection before the intake valve is opened and for controlling the swirl controlling device to suppress production of swirling motion of intake air; said correction means, when the engine is cold, overriding said control device and setting a fuel injection timing such that the major part of the fuel to be injected is injected during the time when the intake valve is closed and controls the swirl control device to suppress production of swirling motion of intake air regardless of the engine load.