Patent ID: 7334564
Filing Date: 2008-02-26
Classification: F01L,F02B,F02D,F02M,Y02T

Abstract:
1. An internal combustion engine comprising: at least one cylinder having a piston mounted therein for reciprocating strokes of the piston in the cylinder, the reciprocating strokes including induction strokes of the piston in the cylinder where at least air is drawn into the cylinder; a first intake channel communicating with the cylinder; a second intake channel communicating with the cylinder; an exhaust channel communicating with the cylinder; a first intake valve in the first intake channel controlling communication between the first intake channel and the cylinder; a second intake valve in the second intake channel controlling communication between the second intake channel and the cylinder; means for supplying fuel to at least the first intake channel; and means for controlling opening of at least one of the first and second intake valves on each induction stroke of the piston in the cylinder to cause an air and fuel mixture to be drawn into the cylinder when only the first intake valve is opened on an induction stroke and to cause only air to be drawn into the cylinder when only the second intake valve is opened on an induction stroke, such that an air only 4 stroke cycle alternates with a fuel/air 4 stroke cycle, and wherein throttling means in the fuel/air inlet admits less than 10% of the cylinder capacity for an induction stroke, as needed for a low idling speed.