US 2008/0302597 A1Published application

Exhaust system

AssigneeJ. Eberspächer GmbH & Co. KG

InventorsJan Kruger, Marco Jess

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Abstract

An exhaust system (1) is provided for an internal combustion engine (4), especially in a motor vehicle, with two separate exhaust gas lines (2, 3) with a first sound transmission feature (7), which couples the two exhaust gas lines (2, 3) with one another, and with a control (9) for activating and deactivating the first sound transmission connection (7) as a function of at least one operating parameter of the internal combustion engine (4). To improve the muffling behavior, a second sound transmission connection (8) is provided, which couples the two exhaust gas lines (2, 3) with one another downstream of the first sound transmission connection (7), and makes possible, depending on the particular operating parameter, three switching states (SZ), namely, a first switching state, in which both sound transmission connections (7, 8) are deactivated, a second switching state, in which only one sound transmission connection (7, 8) is activated, and a third switching state, in which both sound transmission connections (7, 8) are activated.

Claims20

Dependent claims

An exhaust system for a motor vehicle internal combustion engine, exhaust system comprising:

two separate exhaust gas lines for removing exhaust gases of a internal combustion engine;
a switchable first sound transmission means, which couples said two exhaust gas lines with one another for the transmission of airborne sound;
a switchable second sound transmission means downstream of said first sound transmission means, said second sound transmission means couples said two exhaust gas lines with one another for the transmission of airborne sound,
a control means for activating and deactivating said first sound transmission means and for activating and deactivating said second sound transmission means as a function of at least one operating parameter of said internal combustion engine to provide at least three switching states for said two sound transmission means, said at least three switching states comprising:
a first switching state, in which said two sound transmission means are deactivated;
a second switching state, in which one of said first sound transmission means and said second sound transmission means is activated, while another one of said first sound transmission means and said second sound transmission means is deactivated;
and
a third switching state, in which both of said first sound transmission means and said second sound transmission means are activated.

5 more elements

An internal combustion engine exhaust system comprising:

a first exhaust gas line connected to a particular set of pistons of the internal combustion engine for removing some of the exhaust gases of a internal combustion engine;
a second exhaust gas line connected to another particular set of pistons of the internal combustion engine for removing some of the exhaust gases of a internal combustion engine;
a first sound transmission means, connected between said first exhaust gas line and said second exhaust gas line, for the transmission of airborne sound, said first sound transmission means including an actuator and actuator drive for switching a state of airborne sound transmission between said first exhaust gas line and said second exhaust gas line;
a second sound transmission means, connected between said first exhaust gas line and said second exhaust gas line, for the transmission of airborne sound, said second sound transmission means including an actuator and actuator drive for switching a state of airborne sound transmission between said first exhaust gas line and said second exhaust gas line, said second sound transmission means being downstream of said first sound transmission means;
a control means for activating and deactivating said first sound transmission means and for activating and deactivating said second sound transmission means as a function of at least one operating parameter of said internal combustion engine to provide at least three combination switching states for said first sound transmission means combined with said second sound transmission means, said at least three switching states comprising:
a first switching state, in which said two sound transmission means are deactivated;
a second switching state, in which one of said first sound transmission means and said second sound transmission means is activated, while another one of said first sound transmission means and said second sound transmission means is deactivated;
and
a third switching state, in which both of said first sound transmission means and said second sound transmission means are activated.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/132,801Filed 4 Jun 2008
Priority: DE 10 2007 026 812.46 Jun 2007
Published: 11 Dec 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F01N 13/02
Exhaust or silencing apparatus characterised by constructional features: having two or more separate silencers in series
F01N 13/011
Exhaust or silencing apparatus characterised by constructional features: having two or more purifying devices arranged in parallel
F01N 13/08
Exhaust or silencing apparatus characterised by constructional features: other arrangements or adaptations of exhaust conduits
F01N 13/107
Of exhaust manifolds: more than one exhaust manifold or exhaust collector

Family

US 7,703,574 B2Related patent
US 2008/0302597 A1This patent

From the US filing history. Foreign family members aren’t listed.

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