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US 8,800,272 B2Granted
System and method for processing NHD slippage of a selective catalyst reduction system
AssigneeFord Global Technologies, LLC
InventorsAvra Brahma, Devesh Upadhyay
Life of this patent
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Abstract
Systems and methods for storing NH3 that has slipped through a first SCR are described. In one example, NH3 is stored in a second SCR and released to the first SCR via desorption. The systems and method may reduce NH3 consumption and increase NH3 utilization within an exhaust system.
Claims12
A system for controlling vehicle exhaust system NH3 slippage, comprising:
- a first SCR positioned in a vehicle exhaust system downstream of an engine;
- a second SCR positioned in the vehicle exhaust system;
- a first valve and a second valve;
- and
- a controller including instructions to direct NH3 slippage from an outlet of the first SCR to an inlet of the second SCR, and to direct exhaust gases from an outlet of the second SCR to an inlet of the first SCR, the controller including further instructions to adjust a state of the first valve to direct NH3 slippage from the first SCR to the second SCR and to adjust a state of the second valve to direct exhaust gases from the second SCR to the first SCR and from the first SCR directly to atmosphere.
2 more elements
A NH3 slippage control system, comprising:
- a first SCR positioned in an exhaust system downstream of an engine;
- a second SCR positioned in the exhaust system in parallel with the first SCR, an outlet of the second SCR being coupled to an inlet of the first SCR and an outlet of the first SCR being coupled to an inlet of the second SCR;
- and
- a controller including instructions to direct first SCR NH3 slippage to the second SCR, and instructions to reduce an amount of NH3 stored within the second SCR after first SCR NH3 slippage is less than a threshold level.
1 more element
Dependencies are inferred from the claim text.