Selective catalytic reduction (SCR) catalyst depletion control systems and methods

US8454916B2 · kind B2 · utility

Assignee

• GM GLOBAL TECHNOLOGY OPERATIONS LLC · US

Inventors

• James M. Perrin · Livonia, US
• Rebecca J. Darr · Milford, US
• Paul Jasinkiewicz · Northville, US
• Jason Daniel Mullins · Brighton, US
• Kyle E. Crawford · Howell, US

Key dates

• Filing date: Jun 18, 2010
• Grant date: Jun 4, 2013
• Expiry date: Jun 18, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A dosing control system for a vehicle includes a current storage module, an adaption triggering module, and an adaption ending module. The current storage module estimates an amount of ammonia stored by a selective catalytic reduction (SCR) catalyst. The adaptation triggering module triggers a reduction of the amount of ammonia stored by the SCR catalyst to zero when a first amount of nitrogen oxides (NOx) measured by a first NOx sensor located downstream of the SCR catalyst is greater than a predicted value of the first amount of NOx. The adaptation ending module selectively ends the reduction and enables injection of dosing agent based on a comparison of the first amount of NOx with a second amount of NOx upstream of the SCR catalyst.