Patent ID: 7337609
Filing Date: 2008-03-04
Classification: F01N

Abstract:
1. An exhaust system for a vehicle having a diesel engine comprising: a diesel particulate filter having an upstream end for receiving exhaust gasses and a downstream end for exiting the exhaust gasses; an intermediate pipe, operatively engaging the downstream end of the diesel particulate filter, having a main flow portion and a restricted flow portion, with the main flow portion including a particulate filter backpressure valve controllable to selectively restrict flow of the exhaust gasses in the main flow portion, and the restricted flow portion including a restriction; and a muffler, operatively engaging the intermediate pipe for selectively receiving the flow of the exhaust gasses from the main flow portion and the restricted flow portion, wherein the muffler includes a first chamber, a second chamber, a third chamber, a primary flow pipe extending through the first, second and third chambers to an outlet from the muffler, a secondary muffler pipe extending from the restricted flow portion to the third chamber, and a return muffler pipe extending from the third chamber to the first chamber, and the primary flow pipe includes a set of perforations located within the first chamber.