Methods and systems for ammonia slip detection

US8943798B2 · kind B2 · utility

Assignee

• Ford Global Technologies, LLC · US

Inventors

• Chris Riffle · Brighton, US
• Frank M. Korpics · Belleville, US
• Michiel J. Van Nieuwstadt · Ann Arbor, US
• Devesh Upadhyay · Canton, US
• John Paul Bogema · Woodhaven, US
• Jeff Reich · Plymouth, US

Key dates

• Filing date: Oct 12, 2012
• Grant date: Feb 3, 2015
• Expiry date: Jan 22, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Various systems and methods are described for detecting ammonia slip. In one example method, an amount of exhaust gas recirculation is reduced when output from an exhaust gas sensor indicates an increase in nitrogen oxide above a threshold amount. When the sensor output increases above a second threshold while the exhaust gas recirculation is reduced, the sensor output is allocated to nitrogen oxide; and when the sensor output does not increase above a second threshold while the exhaust gas recirculation is reduced, the sensor output is allocated to ammonia.