Exhaust system monitoring methods and systems

US7900439B2 · kind B2 · utility

Assignee

• GM GLOBAL TECHNOLOGY OPERATIONS LLC · US

Inventors

• Robert J. Genslak · Chesterfield Township, US
• Igor Anilovich · Gaylord, US
• Justin F. Adams · Ypsilanti, US
• Jeffry A. Helmick · Oxford, US
• Edward Stuteville · Linden, US
• Wesley W. Wald · Linden, US
• Vidyapriya Srinivasan · South Lyon, US

Key dates

• Filing date: Jun 8, 2007
• Grant date: Mar 8, 2011
• Expiry date: Nov 25, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A diagnostic system for an exhaust system including a catalyst and a post-catalyst oxygen sensor is provided. The system generally includes a fuel control module that commands fuel to transition from a rich condition to a lean condition and that commands fuel to transition from the lean condition to the rich condition. A first diagnostic module monitors the post-catalyst oxygen sensor during the transition from the rich condition to the lean condition. A second diagnostic module monitors the catalyst during the transition from the lean condition to the rich condition.