Patent ID: 7762064
Filing Date: 2010-07-27
Classification: F01N

Abstract:
1. An exhaust system for an engine, comprising: a first exhaust passage providing a first flow area; a second exhaust passage communicatively coupled to the first exhaust passage, the second exhaust passage providing a second flow area greater than the first flow area, wherein the second exhaust passage is arranged downstream of the first exhaust passage; wherein a first wall surface of the first exhaust passage defines at least a first opening for transferring air external the first exhaust passage to within the first exhaust passage and a second wall surface of the second exhaust passage defines at least a second opening for transferring air external the second exhaust passage to within the second exhaust passage; a first protrusion disposed within the first exhaust passage upstream of the first opening; a second protrusion disposed within the second exhaust passage upstream of the second opening; and wherein the second exhaust passage includes a plurality of branches, wherein the second flow area is a combined flow area of the plurality of branches and is greater than the first flow area.