Exhaust gas recirculation type internal combustion engines and method of operating same
AssigneeResearch Corporation
InventorWilliam N. Groves
Life of this patent
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Abstract
A multi-cylinder internal combustion engine is disclosed in which a portion of the exhaust gas is selectively added to each cylinder. The exhaust gas is caused to swirl along the inside wall of the cylinder. Air or a fuel/air mixture is caused to swirl in a central zone in the cylinder in the same direction of swirl as the direction of swirl of the exhaust gas thereby providing a stratified exhaust gas recirculation design.
Claims6
In a multi-cylinder internal combustion engine having a fuel and an air source connected to each cylinder via a substantially centrally located intake valve means in each cylinder;
- means for stratifying a combustible fuel/air mixture and exhaust gas in the cylinder during the intake stroke, said means for stratifying comprising:
- (a) fuel/air mixture swirling means for each cylinder;
- (b) at least one inlet port in each cylinder open to each cylinder from about 60.degree. BBDC to about 60.degree. ABDC;
- (c) conduit means connecting each said at least one inlet port with a source of pressurized exhaust gas;
- (d) said source of pressurized exhaust gas comprising the gas exhausting from the cylinder 360.degree. apart on the firing order of the engine;
- (e) means for causing the exhaust gas to swirl in each cylinder in the same direction as the swirl of the air/fuel mixture.
In a multi-cylinder internal combustion engine having a carburetor connected to each cylinder via a substantially centered intake valve means in each cylinder during the intake stroke said means for stratifying comprising:
- (a) fuel/air mixture swirling means upstream of the intake valve of each cylinder;
- (b) at least one tangential inlet port in each cylinder open to each cylinder from about 60.degree. BBDC to about 60.degree. ABDC;
- and
- (c) conduit means connecting each tangential inlet port with pressurized exhaust gas exhausting from the cylinder 360.degree. apart on the firing order of the engine.
A method of operating at least a two cylinder internal combustion engine comprising the steps:
- (a) directing in a swirling path air or a combustible fuel/air mixture into an engine cylinder during the intake stroke;
- (b) tangentially admitting in a swirling path exhaust gas exhausting from a cylinder 360.degree. apart on the firing order of the engine, into the cylinder to provide a stratified charge of air or a fuel/air mixture and exhaust gas;
- (c) compressing the stratified charge;
- (d) igniting the stratified charge;
- (e) expanding the charge to produce useful work;
- and
- (f) exhausting the cylinder.
Dependencies are inferred from the claim text.