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1. US20200173320 - ACOUSTIC VOLUME IN HOT-END OF EXHAUST SYSTEMS

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[ EN ]

Claims
1. A vehicle exhaust system comprising:
a component housing defining an internal cavity;
a first exhaust gas treatment element positioned within the internal cavity;
a second exhaust gas treatment element positioned within the internal cavity and axially spaced from the first exhaust gas treatment element by a gap; and
a resonator volume in communication with the internal cavity.
2. The vehicle exhaust system according to claim 1 wherein the resonator volume is formed between an outer surface of the component housing and an inner surface of a resonator housing that at least partially surrounds the component housing, and including at least one resonator connection in communication with the resonator volume, wherein the resonator connection is located at the gap.
3. The vehicle exhaust system according to claim 1 wherein the resonator volume is formed between an outer surface of the component housing and an inner surface of a resonator housing that at least partially surrounds the component housing, and including an inlet cone positioned at one end of the component housing and an outlet cone positioned at an opposite end of the component housing, and including at least one resonator connection in communication with the resonator volume, and wherein the at least one resonator connection is located at one of the inlet and outlet cones.
4. The vehicle exhaust system according to claim 3 wherein the at least one resonator connection comprises at least a first resonator connection located at the gap and a second resonator connection located at one of the inlet and outlet cones.
5. The vehicle exhaust system according to claim 1 wherein there is no net flow out of the resonator volume.
6. The vehicle exhaust system according to claim 1 wherein the resonator volume is formed between an outer surface of the component housing and an inner surface of a resonator housing that at least partially surrounds the component housing, and wherein the resonator volume is concentric with the center axis such that the resonator volume completely and entirely surrounds an outer circumference of the first and second gas treatment elements.
7. The vehicle exhaust system according to claim 1 wherein the resonator volume is formed between an outer surface of the component housing and an inner surface of a resonator housing that at least partially surrounds the component housing, and wherein the resonator volume is offset relative to the component housing such that the resonator volume only partially surrounds an outer circumference of the first and second gas treatment elements.
8. The vehicle exhaust system according to claim 1 wherein the resonator volume is enclosed within a resonator housing and including at least one connection of the resonator housing to the component housing.
9. The vehicle exhaust system according to claim 8 wherein the component housing comprises a center housing portion that encloses the first and second gas treatment elements, an inlet portion positioned at one end of the center housing portion, and an outlet portion positioned at an opposite end of the center housing portion, and wherein the at least one connection comprises at least one pipe that is connected to at least one of the center housing, inlet, and outlet portions.
10. The vehicle exhaust system according to claim 10 wherein the resonator housing is located externally of the component housing.
11. The vehicle exhaust system according to claim 1 wherein the resonator volume is enclosed within a resonator housing and including at least one pipe that connects the resonator housing to at least one of the component housing, an inlet pipe to the component housing, and an outlet pipe from the component housing.
12. The vehicle exhaust system according to claim 1 including a plurality of resonator connections in communication with the resonator volume.
13. The vehicle exhaust system according to claim 1 wherein the resonator volume is in parallel with the first and second gas treatment elements.
14. A vehicle exhaust system comprising:
a first housing defining an internal cavity;
at least one exhaust gas treatment element positioned within the internal cavity;
a resonator volume spaced radially outwardly of the at least one exhaust gas treatment element; and
a resonator connection to provide communication between the resonator volume and the internal cavity.
15. The vehicle exhaust system according to claim 14 including a second housing that defines the resonator volume, wherein the resonator connection is either located internally within the second housing or externally of the second housing.
16. A vehicle exhaust system comprising:
a component housing defining an internal cavity;
an inlet coupled to an upstream end of the component housing;
an outlet coupled to a downstream end of the component housing;
a first exhaust gas treatment element positioned within the internal cavity;
a second exhaust gas treatment element positioned within the internal cavity and separated from the first exhaust gas treatment element by a gap;
a resonator volume in communication with the internal cavity; and
a plurality of resonator connections in communication with the resonator volume.
17. The vehicle exhaust system according to claim 16 wherein the second exhaust gas treatment element is axially spaced from the first exhaust gas treatment element by the gap such that the first and second exhaust gas treatment elements are coaxial, and wherein the plurality of resonator connections comprises at least a first resonator connection located at the gap and a second resonator connection located at the inlet or outlet.
18. The vehicle exhaust system according to claim 17 wherein the resonator volume is external to the component housing.
19. The vehicle exhaust system according to claim 16 including a resonator housing that defines the resonator volume wherein the resonator housing at least partially surrounds the component housing.
20. The vehicle exhaust system according to claim 16 wherein the second exhaust gas treatment element is in parallel with the first exhaust gas treatment element such that the first and second exhaust gas treatment elements are non-coaxial, and wherein the plurality of resonator connections comprises at least a first resonator connection located at the gap and a second resonator connection located at the inlet or outlet.
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