Exhaust-gas aftertreatment system
AssigneeFord Global Technologies, LLC
InventorJan Harmsen
Life of this patent
Estimating the term…
Abstract
An exhaust-gas aftertreatment system for exhaust gases of an internal combustion engine. In one example, a portion of the engine exhaust gases goes to the particulate filter and the other portion of engine exhaust gases goes to the catalyst element. The outlet of the filter element is directed to the inlet of the catalyst element and the outlet of the catalyst element is directed to the inlet of the filter element. Thus, the engine exhaust gases are filtered and processed by a catalyst.
Claims18
An exhaust-gas aftertreatment system for exhaust gases of an internal combustion engine, comprising:
- a filter element having an input side and an output side;
- a catalyst element having an input side and an output side;
- an inlet pipe that is divided into a filter pipe and a catalyst pipe on said input side of said filter element and said catalyst element such that one part of an entire exhaust-gas stream flows directly from said inlet pipe to said filter pipe and directly from said filter pipe to said filter element and another part of said entire exhaust-gas stream flows directly from said inlet pipe to said catalyst pipe and directly from said catalyst pipe to said catalyst element;
- a first return pipe positioned downstream of said filter element and upstream of said catalyst element when said one part of said entire exhaust-gas stream flows directly from said inlet pipe to said filter pipe and directly from said filter pipe to said filter element and when another part of said entire exhaust-gas stream flows directly from said inlet pipe to said catalyst pipe and directly from said catalyst pipe to said catalyst element;
- and
- a second return pipe positioned downstream of said catalyst element and upstream of said filter element when said one part of said entire exhaust-gas stream flows directly from said inlet pipe to said filter pipe and directly from said filter pipe to said filter element and when another part of said entire exhaust-gas stream flows directly from said inlet pipe to said catalyst pipe and directly from said catalyst pipe to said catalyst element, and wherein said catalyst element and said filter element are contained in a single housing, and wherein said first return pipe is positioned directly opposite said filter pipe on the output side of said filter element, and wherein said second return pipe is positioned directly opposite said catalyst pipe on said output side of said catalyst element.
A method for processing exhaust gases of an engine, comprising:
- operating an engine;
- separating an exhaust flow from said engine into a first fraction and a second fraction;
- directing said first fraction of exhaust gas to a catalyst;
- directing said second fraction of exhaust gas to a particulate filter;
- directing said first fraction of exhaust gas from the catalyst to said particulate filter;
- and
- directing said second fraction of exhaust gas from the particulate filter to said catalyst, and wherein said first fraction of exhaust gas is directed to an input side of said particulate filter after passing through said catalyst by way of a first pipe while said second fraction of exhaust gas is directed to an input side of said catalyst by way of a second pipe after passing through said particulate filter.
A method for processing exhaust gases of an engine, comprising:
- operating an engine;
- separating an exhaust flow from said engine into a first fraction and a second fraction;
- directing said first fraction of exhaust gas to a catalyst while directing said second fraction of exhaust gas to a particulate filter;
- directing said first fraction of exhaust gas to said particulate filter while directing said second fraction of exhaust gas to said catalyst;
- and adjusting a fuel amount delivered to said engine in response to an oxygen concentration of gases of said first fraction of exhaust gas or in response to an oxygen concentration of gases of said second fraction of exhaust gas.
Dependencies are inferred from the claim text.