Gm Global Technolgoy Operations, Inc.

Electronic Data Systems Corporation

Michael J Taljonick

Andrew M Zettel

Rick H Schroeder

Peter E Wu

Wei D Wang

John F Van Gilder

Daniel P Grenn

Aniket P Kothari

Leonard G Wozniak

Marek L Wilmanowicz

Jayanthi Padmanabhan

Christopher J Dobies

A distributed on-board diagnostic (OBD) architecture for a control system of a vehicle includes a plurality of control modules that are in communication with one another and a designated master OBD control module that is one of the plurality of control modules. The master OBD control module performs functions that a remainder of the plurality of control modules are incapable of performing including at least one of arbitrating a malfunction indicator lamp (MIL) state, arbitrating and storing OBD freeze frame data and determining OBD status flags of the remainder of the plurality of control modules.

Distributed diagnostics architecture

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.

Belt slip diagnostic system for accessory and hybrid electric drives

A method and apparatus to monitor operation of an electrically-actuated hydraulic pump selectively operative to supply pressurized fluid to a hydraulic circuit for a transmission device operably connected to an internal combustion engine of a vehicle includes monitoring vehicle operation and passively and intrusively monitoring hydraulic circuit pressure. The hydraulic pump is functioning properly when the monitored pressure in the hydraulic circuit exceeds a threshold. A fault related to the hydraulic circuit is identified when the monitored pressure in the hydraulic circuit does not exceed the threshold.

Method and apparatus to monitor operation of an auxiliary hydraulic pump in a transmission

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Davison, MI, United States of America

Michael J Taljonick