A converter containing a NOx absorbing and reducing catalyst is disposed in the exhaust passage of an internal combustion engine. The upstream half portion (portion of the inlet side) of the substrate of the NOx absorbing and reducing catalyst in the converter carries the oxygen storage component that absorbs oxygen in the exhaust gas when the air-fuel ratio of the exhaust gas is lean and releases the absorbed oxygen when the air-fuel ratio of the exhaust gas flowing in is rich in addition to carrying the NOx absorbing and reducing catalyst. After NOx is absorbed by the NOx absorbing and reducing catalyst as a result of operating the engine at a lean air-fuel ratio, the engine is operated at a rich air-fuel ratio, so that NOx is released from the NOx absorbing and reducing catalyst and is purified by reduction. Here, oxygen is released from the oxygen storage component carried by the upstream half portion of the substrate and is reacted with the H 2 and CO components in the exhaust gas, so that the temperature of the NOx absorbing and reducing catalyst is raised within short periods of time due to the heat of reaction. Therefore, the catalyst exhibits increased activity and the NOx absorbing and reducing catalyst exhibits improved NOx purification capability.

Exhaust gas purification device for an internal combustion engine

An exhaust gas aftertreatment installment and associated exhaust gas aftertreatment method utilizes a nitrogen oxide storage catalytic converter and an SCR catalytic converter. A particulate filter is provided upstream of the nitrogen oxide storage catalytic converter or between the latter and the SCR catalytic converter or downstream of the SCR catalytic converter. The time of regeneration operating phases of the nitrogen oxide storage catalytic converter can be determined as a function of the nitrogen oxide content of the exhaust gas downstream of the nitrogen oxide storage catalytic converter or of the SCR catalytic converter and/or as a function of the ammonia loading of the latter. Moreover, a desired ammonia generation quantity can be determined for a respective regeneration operating phase. The installation and method are adopted for use for motor vehicle internal combustion engines and other engines which are operated predominantly in lean-burn mode.

Exhaust Gas Aftertreatment Installation and Method

One aspect of the invention relates an exhaust treatment system having an SCR reactor following a NOx adsorber. Syn gas is used to regenerate the NOx adsorber. Another aspect relates to an LNT/SCR provided with an ammonia source separate from the LNT. A further aspect relates to a system comprising first and second LNTs and one or more SCRs downstream of the LNTs. A still further aspect relates to a device comprising first and second NOx adsorbers contained in a single housing. Another aspect relates to coating a surface of a moving part in an exhaust system with an oxidation catalyst to mitigate fouling. Additional aspects of the invention relate to strategies for controlling one or more of the time to initiate a regeneration cycle, the time to terminate a regeneration cycle, and the reductant injection rate during regeneration of LNT/SCR exhaust treatment systems.

Hybrid catalyst system for exhaust emissions reduction

A first cylinder and a second cylinder are provided. A first exhaust pipe is connected to the first cylinder and a second exhaust pipe is connected to the second cylinder. A communicating pipe connects together an intermediate portion of the first exhaust pipe with an intermediate portion of the second exhaust pipe. An exhaust gas control catalyst is arranged in the second exhaust pipe downstream of the portion to which the communicating pipe is connected. Exhaust gas amount reducing devices are provided which reduce the amount of exhaust gas that flows from the first exhaust pipe into the second exhaust pipe through the communicating pipe during execution of rich/lean burn control which performs combustion with an air-fuel ratio of an air-fuel mixture that is richer than the stoichiometric air-fuel ratio in one of the first cylinder and second cylinder and performs combustion with an air-fuel ratio of an air-fuel mixture that is leaner than the stoichiometric air-fuel ratio in the other cylinder.

Exhaust Gas Control Apparatus for Internal Combustion Engine

An internal combustion engine comprises an intake tract in which a throttle valve is disposed. The engine also comprises a camshaft which acts on gas inlet valves associated with respective cylinders. A phase-adjustment device is used to adjust a phase between the camshaft and a crankshaft. A desired air mass flow in a combustion chamber of the cylinder is determined depending on a charge requirement requested by the driver. The desired air mass flow is adjusted by varying the phase between the camshaft and the crankshaft if the desired air mass flow can be adjusted by varying the phase while substantially maintaining an actual pressure difference upstream and downstream of the throttle valve. Otherwise, the desired air mass flow is adjusted by varying the opening angle of the throttle valve.

Method and device for controlling an internal combustion engine

Die
Erfindung betrifft eine fur
ein Kraftfahrzeug bestimmte Antriebseinheit (1). Die Antriebseinheit
(1) ist mit einer Brennkraftmaschine (2) ausgestattet, durch die
im Betrieb mittels eines Riementriebes (3) ein als Wasserpumpe ausgefuhrtes erstes
Nebenaggregat (4) sowie ein als Klimakompressor ausgefuhrtes zweites
Nebenaggregat (5) und ein je nach Betriebsart als Starter und als
Generator einsetzbarer Starter-Generator (6) angetrieben wird. Um
zumindest das als Klimakompressor ausgefuhrte zweite Nebenaggregat (5)
auch im Stillstand der Brennkraftmaschine (2) betreiben zu konnen, ist
der Riementrieb (3) mittels eines einen Freilauf aufweisenden Kupplungselementes
(7) mit der Brennkraftmaschine (2) derart verbunden, dass im Stillstand
der Brennkraftmaschine (2) lediglich die beiden Nebenaggregate (4,
5) von dem Starter-Generator (6), nicht aber zugleich auch die Brennkraftmaschine
(2) angetrieben werden. Mittels des den Freilauf aufweisenden Kupplungselementes
(7) kann dabei ein stufenloser Ubergang
der Antriebsart von der Brennkraftmaschine (2) auf den Starter-Generator
(6) erfolgen. Zum Starten der Brennkraftmaschine (2) wird das Kupplungselement
(7) lediglich kurzzeitig geschlossen, so dass die Antriebsleistung
des Starter-Generators (6) auf die Brennkraftmaschine (2) ubertragen
wird.

Antriebseinheit mit einer Brennkraftmaschine

The purification of exhaust fumes from internal combustion engines driven with a lean mixture, in particular Diesel engines, is problematic as to nitrogen oxide removal, since large mass flows of exhaust fumes are expelled even at low load states. In order to improve NOx conversion, the exhaust fume system of an internal combustion engine driven with a lean mixture contains a three-zone catalytic converter. Its first zone (36 + 34) contains an NOx storage material on a η-aluminium oxide wash coat. Its second zone (37 + 34) contains a precious metal on the wash coat and its third zone (37 + 35) additionally contains an oxygen storage material.

PROCESS FOR REMOVING NOx FROM EXHAUST FUMES

Die Erfindung betrifft Abgasanlage (110) einer Brennkraftmaschine, insbesondere eines Kraftfahrzeuges, mit einem Katalysator (113), insbesondere einem NOx-Speicherkatalysator, wobei vor dem Katalysator (113) eine Kuhlstrecke (112) vorgesehen ist. Hierbei umfast die Kuhlstrecke (112) mehrere separate Abgasleitungen (114) und/oder sind an dieser zusatzliche Kuhlmittel (33; 34; 36) derart vorgesehen, das sich in allen jeweiligen Betriebsphasen der Brennkraftmaschine mit unterschiedlichen Abgasmassenstromen eine Warmeenergieabgabe aus dem Abgas bezogen auf die im Abgas enthaltene Warmeenergie (relative Warmeenergieabgabe) derart erhoht, das sich fur mittlere Werte des Abgasmassenstroms eine maximale Temperaturabsenkung einstellt.

Abgasanlage einer brennkraftmaschine mit katalysator

Die Erfindung betrifft ein Verfahren zur Regelung einer Regeneration eines in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten Speicherkatalysators, wobei der Verbrennungskraftmaschine Mittel zugeordnet sind, die durch eine zumindest temporare Beeinflussung wenigstens eines Betriebsparameters der Verbrennungskraftmaschine eine Einstellung eines Arbeitsmodus ermoglichen und wobei zur Regeneration des Speicherkatalysators die Verbrennungskraftmaschine in einem Arbeitsmodus mit <6 1 (Regenerationsbetrieb) eingestellt wird. DOLLAR A Es ist vorgesehen, das eine Aufnahme und/oder Aufrechterhaltung des Regenerationsbetriebes der Verbrennungskraftmaschine (16) in Abhangigkeit von einer Drehzahl der Verbrennungskraftmaschine (16) und/oder einer angeforderten Last erfolgt.

Verfahren zur Regelung einer Regeneration eines in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten Speicherkatalysators

The method for cooling vehicle exhaust gases flowing through a heat exchanger (10) comprises feeding atmospheric air (18a) at an acute angle through it. Independent claims are included for: (a) a heat exchanger for use in the method; and (b) an exhaust gas system containing the heat exchanger.

Ekkehard Pott

Papers

Antriebseinheit mit einer Brennkraftmaschine

PROCESS FOR REMOVING NOx FROM EXHAUST FUMES

Abgasanlage einer brennkraftmaschine mit katalysator

Verfahren zur Regelung einer Regeneration eines in einem Abgaskanal einer Verbrennungskraftmaschine angeordneten Speicherkatalysators

Method for cooling vehicle exhaust gases flowing through heat exchanger comprises feeding atmospheric air at acute angle through it