Donaldson Comapny, Inc.

Ted J Wiegandt

Wayne M Wagner

Theodore G Angelo

Eivind Stenersen

John R Hiemstra

John Hamrin

Edward A Steinbrueck

Wenzhong Zhang

Zhixin Jason Hou

Mike Anderson

A system or method for controlling the delivery of fuel into the transient flow of an exhaust system to control emissions. A mathematical model representative of the exhaust system can be used to determine, based on operating conditions of the exhaust system, a rate of fuel delivery suitable for achieving a desired result. The desired result can be to increase the temperature of a diesel particulate filter to a temperature suitable for regeneration without exceeding a temperature that may damage the diesel particulate filter.

Method of dispensing fuel into transient flow of an exhaust system

A muffler is described for muffling both positive power and compression brake type engine retarders. The muffler includes an outer shell defining an internal volume. A first, inner, perforated wall is spaced from the outer shell and defines a first, annular, volume therebetween. A first volume of packing material is positioned within the annular volume. An inlet tube is oriented within the internal volume. In certain embodiments, the inner perforated wall circumscribes at least a portion of the inlet tube, and extends a distance of at least 25% of the axial length of the outer wall. Both single and dual muffler systems are described. Methods of use and operation are also provided.

Mufflers for use with engine retarders; and methods

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Eagan, MN, United States of America

Ted J Wiegandt