System and method for injecting ammonia into an exhaust gas stream
AssigneeInternational Engine Intellectual Property Company, LLC
InventorsBrad J. Adelman, Vadim Olegovich Strots, Shyam Santhanam
Life of this patent
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Abstract
A method for injecting ammonia into an exhaust gas stream downstream of a diesel engine includes providing an exhaust gas passageway (11) from the diesel engine to an ambient (14). The exhaust gas passageway (11) includes an NOx Slip Catalyst (NSC) 20 downstream of an NOx Particulate Filter (NPF) 18. The method includes emitting exhaust gas (EG) through the exhaust gas passageway (11), and selectively injecting ammonia (NH3) upstream of the NPF 18, upstream of the NSC (20), both upstream of the NPF and the NSC, or not injecting ammonia, depending on the temperature of the exhaust gas at the NPF and at the NSC.
Claims20
1) A method for injecting ammonia into an exhaust gas stream downstream of a diesel engine, the method comprising:
- providing an exhaust gas passageway from the diesel engine to an ambient, the exhaust gas passageway including an NOx Slip Catalyst (NSC) downstream of an NOx Particulate Filter (NPF);
- emitting exhaust gas through the exhaust gas passageway;
- and
- selectively injecting ammonia at least one of upstream of the NPF and upstream of the NSC dependent on the temperature of the exhaust gas at the NPF and at the NSC.
12) An aftertreatment system for injecting ammonia into an exhaust gas stream downstream of a diesel engine, the system comprising:
- an exhaust gas passageway for the flow of exhaust gas from the diesel engine to an ambient, the exhaust gas passageway including an NOx Slip Catalyst (NSC) in fluid communication with and downstream from an NOx Particulate Filter (NPF);
- and
- an ammonia delivery system in fluid communication with the exhaust gas passageway, the ammonia delivery system including an ammonia storage device (ASDS), and at least one delivery valve, wherein the at least one delivery valve selectively permits the flow of ammonia from the storage device to at least one of upstream of the NPF and upstream of the NSC dependent on the temperature of the exhaust gas at the NPF and the temperature of the exhaust gas at the NSC.
18) A method for injecting ammonia into an exhaust gas stream downstream of a diesel engine, the method comprising:
- providing an exhaust gas passageway from the diesel engine to an ambient, the exhaust gas passageway including a diesel oxidation catalyst (DOC), an NOx Particulate Filter (NPF) downstream from the DOC, and an NOx Slip Catalyst (NSC) downstream of the NPF;
- emitting exhaust gas through the exhaust gas passageway from the diesel engine to the ambient;
- storing ammonia at an ammonia storage device (ASDS);
- actuating at least one delivery valve to selectively permit the flow of ammonia to at least one of a first delivery passageway and a second delivery passageway;
- injecting ammonia one of upstream of the NPF and upstream of the NPF.
Dependencies are inferred from the claim text.