Method of removing soot from exhaust gases
AssigneeFilterwerk Mann & Hummel GmbH
InventorsHans Erdmannsdorfer, Manfred Wagner, Rudi Numrich, Gerd Weyh
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Abstract
A method of removing soot from the exhaust gases of internal combustion engines, especially of the diesel-type, using an exhaust filter which collects the soot and a dosing device which, when triggered by a pressure switch and a series-connected temperature switch, injects a dose of a combustion-inducing substance onto the soot layer with the aid of compressed air. The combustion-inducing substance consists of CuCl and NH.sub.4 NO.sub.3 which are stored as a mixture in a single container or as separate ingredients in two containers.
Claims9
A method of removing soot form the exhaust gas of an internal combustion engine, particularly of a diesel engine, comprising the steps of:
- filtering the soot particles from the exhaust gas by means of an exhaust filter which retains and collects the soot;
- during operation of the engine, form time to time burning off the collected soot to a gas which passes through the exhaust filter by adding to the soot a dose of a flowable combustion-inducing substance which lowers the soot ignition temperature and by also adding a supply of combustion air, the combustion-inducing substance being a mixture of copper(I) chloride and ammonium nitrate;
- monitoring the temperature inside the exhaust filter and using the presence of an operating temperature above a predetermined level as a precondition for the initiation of the burn-off step;
- and
- monitoring the accumulation of soot in the exhaust filter, in terms of the resultant increase in the flow resistance across the filter, and using the presence of a predetermined flow resistance as a trigger condition for the initiation of the burn-off step.
Dependencies are inferred from the claim text.