Belt slip diagnostic system for accessory and hybrid electric drives
AssigneeGM Global Technology Operations LLC
InventorsAndrew M. Zettel, John F. Van Gilder, Rick H. Schroeder, Michael J. Taljonick, Christopher J. Dobies
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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.
Claims21
A diagnostic system for a vehicle comprising:
- a first sensor that generates a first status signal that is indicative of an engine speed of an engine;
- a second sensor that generates a second status signal that is indicative of an actual accessory speed of an accessory that is coupled to said engine via a belt system;
- and
- a control module that determines an expected accessory speed based on said engine speed, that determines a residual accessory speed based on said expected and actual accessory speeds, and that detects a fault in said belt system based on said residual accessory speed,
- wherein said expected accessory speed is an accessory speed when slip in said belt system is less than or equal to a predetermined slip.
Dependencies are inferred from the claim text.