Cummins Engine Company, Inc.

Anthony W Williams

Mark L Wilson

Andrew J Pajakowski

Jon E Krutulis

The present invention is directed to a system for detecting the tampering of the vehicle speed signal in a vehicle having electronic engine control. An algorithm that forms part of the present invention is operable to detect a tampering mode producing a constant transmission out-of-gear signal to the vehicle speed sensor input of the electronic controller, and tampering mode disallowing the electronic controller from acting upon a vehicle owner or manager-programmed top gear ratio, or maximum vehicle speed limit. In response to detecting a possible vehicle speed signal tampering condition, a vehicle speed signal tampering fault code is logged into a memory portion of the controller, a vehicle operator warning lamp is activated and the engine speed is electronically controlled to a vehicle owner/manager programmable maximum engine speed limit. The system is operable with a number of transmission embodiments including manual and automatic types intended for either on or on/off highway applications.

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Columbus, IN, United States of America

Anthony W Williams