초록 ▼

A fuel control device for cylinder injection type internal combustion engines which is capable of cutting off fuel supplying to a combustion chamber depending upon an operating state of the engine and suitable for use in cylinder injection type engines, in which a compression stroke mode can be sele

A fuel control device for cylinder injection type internal combustion engines which is capable of cutting off fuel supplying to a combustion chamber depending upon an operating state of the engine and suitable for use in cylinder injection type engines, in which a compression stroke mode can be selected for the purpose of enabling shifting to fuel cutoff and shifting to fuel injection from cutoff without incurring shock of switching in the engine.

대표청구항 ▼

[ We claim:] [1.] A fuel control apparatus for an in-cylinder injection internal combustion engine,the internal combustion engine injecting fuel directly into a combustion chamber and also being able to select according to an operating state of said internal combustion engine a compression stroke in

[ We claim:] [1.] A fuel control apparatus for an in-cylinder injection internal combustion engine,the internal combustion engine injecting fuel directly into a combustion chamber and also being able to select according to an operating state of said internal combustion engine a compression stroke injection mode in which fuel injection is performed primarily on a compression stroke,the fuel control apparatus comprising:deceleration state detection means for detecting whether or not said internal combustion engine is in a deceleration state;idle detection means for detecting whether or not said internal combustion engine is in an idle state;target air-fuel ratio setting means for setting a target air-fuel ratio for said compression stroke injection mode; andair-fuel ratio control means which can control an air-fuel ratio, based on the target air-fuel ratio set by said target air-fuel ratio setting means;wherein said target air-fuel ratio setting meanssets a first target air-fuel ratio as said target air-fuel ratio, when said deceleration state detection means detects that said internal combustion engine is in a deceleration state and also said idle state detection means detects that said internal combustion engine is not in an idle state, at the time of said compression stroke injection mode, andalso sets as said target air-fuel ratio a value changed stepwise toward a second target air-fuel ratio on a leaner side than said first target air-fuel ratio, when said deceleration state detection means detects that said internal combustion engine is in a deceleration state and also said idle detection means detects that said internal combustion engine is in an idle state, at the time of said compression stroke injection mode.