Gm Global Technolgoy Operations, Inc.

Hiep T Do

Paul Alan Bauerle

Craig J Hawkins

Herve Scelers

Ananth Krishnan

Pascal Tissot

Timothy J Keenan

Ruobai Zhang

A method of controlling traction in a vehicle having at least one non-driven wheel speed sensor. Actual vehicle acceleration and a wheel speed difference are detected. At least one of the actual vehicle acceleration and the wheel speed difference is compared to at least one of a predetermined vehicle acceleration and a predetermined wheel speed difference to detect vehicle wheel slip. A wheel torque is reduced in response to detected wheel slip. The foregoing method allows traction control to be installed in many types of vehicles, including vehicles without ABS. More than one type of wheel slip detection can be implemented, and various types of wheel slip can be detected.

Wheel slip detection and torque management

An engine start security control system for a vehicle having a transmission that is driven by an engine includes a first module that generates a first engine start flag based on an internal mode switch (IMS) signal and a second module that generates a second engine start flag based on a modified IMS signal. A third module selectively generates an engine start allow signal based on the first and second engine start flags.

Security software layer protection for engine start

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West Bloomfield, MI, United States of America

Hiep T Do