Patent ID: 6705275
Filing Date: 2004-03-16
Classification: F02B,F02F,Y02T

Abstract:
An incylinder direct injection spark ignition engine comprising:a cylinder block defining a cylinder bore; a cylinder head comprising a depression defining an upper inside surface of a combustion chamber; a spark plug projecting from the upper surface of the combustion chamber; a piston received in the cylinder bore to reciprocate in the cylinder bore, the piston comprising a piston crown which forms the combustion chamber with the depression of the cylinder head, and which is formed with a cavity; first and second intake ports opened in the upper surface of the combustion chamber, and designed to introduce intake air toward the piston so as to create tumble in cooperation of the cavity; an incylinder fluid motion control device which is to be operated in a first engine operating region, to promote the tumble in the combustion chamber so that injected fuel is conveyed to the spark plug by the tumble; and a fuel injector positioned, between the first and second intake ports, at a position lower than the first and second ports, and arranged to inject fuel directly into the combustion chamber toward the center of the combustion chamber on compression stroke, the fuel injector being configured to produce a fuel spray penetrating a vicinity of the spark plug in a second engine operating region which is a low speed light load region.