초록

A method of controlling fuel supply during a deceleration fuel shutoff mode includes determining the amount of oxygen stored in the catalyst or the temperature thereof and intermittently supplying fuel to the engine such that the fuel reacts in the catalyst to reduce excess oxygen therein.

대표청구항 ▼

[ We claim:] [1.] A method of controlling fuel supply in a direct injection spark ignition engine, the engine having an engine block, at least one piston moveable within at least one cylinder in the engine block, at least one combustion chamber defined by a piston and engine block, a fuel injector d

[ We claim:] [1.] A method of controlling fuel supply in a direct injection spark ignition engine, the engine having an engine block, at least one piston moveable within at least one cylinder in the engine block, at least one combustion chamber defined by a piston and engine block, a fuel injector disposed to inject fuel directly into the combustion chamber and an exhaust catalyst coupled to the combustion chamber, with said method comprising the steps of:determining an engine operating condition;ceasing continuous fuel supply during a predetermined engine operating condition based on said determined engine operating condition;determining an operating condition of the catalyst during said predetermined engine operating condition; and,intermittently supplying fuel to the engine based on said determined catalyst operating condition such that said intermittently supplied fuel reacts in the catalyst to reduce excess stored oxygen in the catalyst.