Belt slip diagnostic system for accessory and hybrid electric drives

US7974749B2 · kind B2 · utility

Assignee

• GM GLOBAL TECHNOLOGY OPERATIONS LLC · US

Inventors

• Andrew M. Zettel · Ann Arbor, US
• John F. Van Gilder · Webberville, US
• Rick H. Schroeder · Lapeer, US
• Michael J. Taljonick · Davison, US
• Christopher J. Dobies · Beverly Hills, US

Key dates

• Filing date: May 29, 2007
• Grant date: Jul 5, 2011
• Expiry date: Jul 2, 2029

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02N15/10
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A diagnostic system for a vehicle includes a first sensor that generates a first status signal, which is indicative of an engine speed of an engine. A second sensor generates a second status signal that is indicative of an actual accessory speed of an accessory. The accessory is coupled to the engine via a belt system. A control module determines an expected accessory speed based on the engine speed and determines a residual accessory speed based on the expected and actual accessory speeds. The control module also detects a fault in the belt system based on the residual accessory speed.