The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 1992
Filed:
Dec. 14, 1990
Dietmar Henkel, Neumarkt, DE;
MAN Nutzfahrzeuge AG, Munich, DE;
Abstract
The invention relates to a method for regenerating a soot filter of a Diesel combustion engine. For the burning of soot deposited on the filter two coupled Helmholtz resonators are provided with the exhaust gases being introduced into the resonance pipes at their center portion. The timed ignition of the burners generates pressure waves in the system which may oscillate. When the top of a pressure wave is reached in one of the resonance housings, the temperature rises due to the adiabatic compression process such that the soot is ignited in the down-stream filter. Thereby the filter is regenerated due to the burning of soot. The burners are ignited in phase opposition so that the pressure waves generated by the burners are eliminated by interference at the location of the opening of the exhaust gas line into the resonance pipes. An increase of the counter pressure in the exhaust gas line due to negative feedback of the pressure waves is thereby prevented.