Engine knock diagnostic

US9157825B2 · kind B2 · utility

Assignee

• GM GLOBAL TECHNOLOGY OPERATIONS LLC · US

Inventors

• Wajdi B. Hamama · Iron River, US
• Craig M. Sawdon · Williamston, US
• Eric Ferch · Westland, US
• Hamid M. Esfahan · Ann Arbor, US
• John F. Van Gilder · Webberville, US
• Brian D. Francis · Fenton, US
• Anthony E. Cubr · Fenton, US

Key dates

• Filing date: Nov 12, 2008
• Grant date: Oct 13, 2015
• Expiry date: Oct 1, 2029

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D35/027
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A knock diagnostic module having a knock module that increments a sample count when a cylinder firing signal corresponding to a first cylinder is received and selectively increments a knock count based on a knock detection signal that corresponds to the cylinder firing signal of the first cylinder A knock analysis module analyzes the knock count of the first cylinder when the sample count of the first cylinder reaches a predetermined value and selectively generates an excessive knock signal when the knock count exceeds a predetermined threshold. A remedial action module selectively performs a remedial action based on the excessive knock signal.