Control method for dual path NOx adsorber system
AssigneeSouthwest Research Institute
InventorsMagdi K. Khair, Harley D. Ferguson III
Life of this patent
Estimating the term…
Abstract
A method of controlling a dual path NOx adsorber system. The amount of exhaust into the two paths of the system is controlled by a diverter valve at the beginning of each path. The valves are operated such that most of the time, the adsorbers are simultaneously in adsorption mode. The adsorbers alternate with each other to briefly enter a regeneration mode, during which they receive a very small amount of the exhaust flow and also receive supplemental fuel injection.
Claims18
A method of controlling regeneration of NOx adsorbers in a dual path NOx adsorber system that treats exhaust during operation of an internal combustion engine, comprising the steps of:
- placing both paths in adsorption mode, such that a NOx adsorber in each path is storing NOx emissions;
- placing the first path in regeneration mode, such that the adsorber receives 5% or less of the exhaust from the engine and receives supplemental fuel;
- placing the second path in regeneration mode;
- and
- repeating the above steps during operation of the engine;
- wherein the duration of the adsorption mode is substantially greater than that of the regeneration mode.
A method of controlling regeneration of NOx adsorbers in a dual path NOx adsorber system that treats exhaust during operation of an internal combustion engine, comprising the steps of:
- directing substantially equal amounts of exhaust into each path of the adsorber system, such that each adsorber is in adsorption mode simultaneously;
- determining when the adsorber on a first path is to be regenerated;
- in response to the determining step, limiting the flow of exhaust to approximately 5% or less to the first path and directing the remaining flow to the second path;
- regenerating the adsorber in the first path;
- limiting the flow of exhaust to approximately 5% or less to the second path and directing the remaining flow to the first path;
- regenerating the adsorber in the second path;
- and
- repeating the above steps, such that both adsorbers are in adsorption mode substantially longer than in regeneration mode.
Dependencies are inferred from the claim text.