US 6,141,959 A · Multi-cylinder air-compressing injection-type internal-combustion engine

Abstract

A multi-cylinder air-compressing injection-type internal-combustion engine having a nitric oxide adsorber catalyst and an exhaust gas return device. In order to increase the hydrocarbon fraction in the exhaust gas in front of an exhaust gas aftertreatment device during a regeneration phase and to reduce the oxygen content, exhaust gas pipes of the cylinders are divided into at least two flows, which extend separately from one another at least along a distance. An increased hydrocarbon emission is generated exclusively in the cylinders of one of the flows at times. Another of the flows is connected by way of the exhaust gas return device with an air intake pipe of the internal-combustion engine.

Claims20

Dependent claims

An air-compressing injection-type internal-combustion engine, comprising:

an air intake pipe;
a plurality of cylinders communicating with said air intake pipe, each of said cylinders communicating with respective exhaust gas pipes, said exhaust gas pipes being divided into at least two exhaust gas flows which extend separately from one another at least along a distance;
an increased hydrocarbon emission being selectively generated exclusively in the cylinders corresponding to a first of said flows;
and
a second of said flows being communicable with said air intake pipe via an exhaust gas return device;
each exhaust gas flow being fed to a nitric oxide adsorber catalyst.

3 more elements

A system for controlling the exhaust gas of an air-compressing injection-type internal-combustion engine, comprising:

an air intake pipe;
a plurality of cylinders communicating with said air intake pipe;
at least two separate exhaust gas conduits communicating with said cylinders, a first one of the exhaust gas conduits communicating with at least a first one of the cylinders, a second one of the exhaust gas conduits communicating with at least a second one of the cylinders, said at least a first one of the cylinders being mutually exclusive from said at least a second one of the cylinders;
a control device which selectively generates an increased hydrocarbon emission exclusively in said at least a first one of the cylinders;
an exhaust gas return device arranged in said second one of the exhaust gas conduits and controllable to selectively divert at least a portion of an exhaust gas flow through said second one of the exhaust gas conduits to said air intake pipe.

2 more elements

Dependencies are inferred from the claim text.

Multi-cylinder air-compressing injection-type internal-combustion engine

Life of this patent

Multi-cylinder air-compressing injection-type internal-combustion engine

Life of this patent

Abstract

Claims20