Patent ID: 6085712
Filing Date: 2000-07-11
Classification: F02B,F02F,F02M,Y02T

Abstract:
A stratified charge internal combustion engine fitted with a first and second intake manifold having branches that are configured to supply two gas streams to an intake port of each engine cylinder, the two streams entering each cylinder separately but in parallel with one another so as to swirl about a common axis in the combustion chamber and thereby produce a charge that is stratified radially from the axis of swirl, the first manifold supplying a metered quantity of air within which the fuel to be burnt is dispersed and the second manifold supplying dilution gases, wherein means are arranged along the branches of the first manifold for partially obstructing the flow at times when the engine is operating with a stratified charge so as to introduce an additional pressure drop along the branches of the first manifold in order to render the total resistance to gas flow along the branches of the first manifold substantially equal to the total resistance to gas flow along the branches of the second manifold, the flow obstructing means being positioned at a distance upstream of the intake port for the increased velocity at the flow obstructing means to be dissipated before reaching the intake port.