Patent ID: 6167865
Filing Date: 2001-01-02
Classification: F02B,F02M

Abstract:
An intake system of an internal combustion engine having a plurality of cylinders, at least one intake valve per cylinder, and an intake port leading to the intake valve, the intake system comprising: an intake manifold having a plenum connected to ambient air by way of a main throttle; a plurality of branches each leading from the plenum to the respective intake port of a respective one of the engine cylinders; a plurality of storage pipes each connected in parallel with a respective one of the branches of the intake manifold, each storage pipe opening at a first end into the plenum and opening at a second end into the associated intake port; a plurality of auxiliary pipes connecting an auxiliary gas supply at a respective position along each of the storage pipes, each of the positions along each of the storage pipes of the connection with the auxiliary pipe is such that when the associated intake valve is closed, a portion of the gas from the auxiliary supply is drawn by an intake manifold vacuum only into the storage pipe, and when the associated intake valve is subsequently opened, air form the associated branch of the intake manifold and the gas from the auxiliary supply stored in the storage pipe enter the cylinder as parallel streams to form stratified regions of air and gases from the auxiliary supply within the cylinder.