Method and system of directing exhaust gas
AssigneeCaterpillar Inc.
InventorStephan Roozenboom
Life of this patent
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Abstract
A method of directing flow of exhaust gas includes directing a first portion of the flow through a first flow path and directing a second portion of the flow through a second flow path. A temperature of at least a portion of the flow in the first flow path is increased, and the flow in the first flow path is sent through a filter. The first and second portions of the flow downstream of the filter to are combined form a combined flow. The combined flow is maintained within a predetermined range of temperatures, and the combined flow is directed to a catalyst.
Claims21
A method of directing flow of exhaust gas, comprising:
- directing a first portion of the flow through a first flow path;
- directing a second portion of the flow through a second flow path;
- increasing a temperature of at least a portion of the flow in the first flow path;
- sending the flow in the first flow path through a filter;
- combining the first and second portions of the flow downstream of the filter to form a combined flow;
- maintaining the combined flow within a predetermined range of temperatures;
- and
- directing the combined flow to a catalyst.
An aftertreatment system comprising:
- first and second flow paths, each of the flow paths receiving a separate portion of a flow;
- a filter and a regeneration device positioned in the first flow path, the regeneration device being fluidly connected to an inlet of the filter and configured to increase a temperature of at least a portion of the flow in the first flow path, the first and second flow paths being combined downstream from the filter and the regeneration device to form a combined flow;
- a catalyst positioned downstream from where the first and second flow paths combine;
- and
- a controller configured to maintain the combined flow within a predetermined range of temperatures.
A method of directing flow of exhaust gas, comprising:
- directing a first portion of the flow through a first flow path;
- directing a second portion of the flow through a second flow path;
- increasing a temperature of at least a portion of the flow in the first flow path;
- sending the flow in the first flow path through a filter;
- controlling an amount of flow directed through the second flow path when increasing the temperature of the at least a portion of the flow in the first flow path;
- combining the first and second portions of the flow downstream of the filter to form a combined flow;
- and
- directing the combined flow to a NOx-reducing catalyst.
Dependencies are inferred from the claim text.