Gm Global Technolgoy Operations, Inc.

Yingmei Si

Qingrong Zhao

Qi Zhang

Bakhtiar Brian Litkouhi

Nikolai K Moshchuk

Youssef A Ghoneim

David M Sidlosky

Sami Ahmed

Yadollah Sabri

Valarie V Boatman

Steven T Schweitzer

Simon E Zimmerman

Methods and systems for determining road surface information in a vehicle. In one embodiment, the method includes: determining at least one condition assessment value based on steering data; determining a feature set to include at least one of self-aligning torque (SAT), slip angle, SAT variance, steering rate, and lateral acceleration based on the condition assessment value; processing steering data obtained during a steering maneuver and associated with the feature set using a pattern classification technique; and determining a surface type based on the processing.

Methods and systems for estimating road surface friction coefficient using self aligning torque

Methods and systems are provided for determining a road surface friction coefficient and controlling a feature of the vehicle based thereon. In one embodiment, a method includes: receiving signals from an electronic power steering system and an inertial measurement unit; estimating parameters associated with an electronic power steering system model using an iterative optimization method; calculating an electronic power steering system variable using the electronic power steering system model, the estimated parameters and one or more of the received signals; determining whether the calculated electronic power steering system variable satisfies a fitness criterion; and when the calculated electronic power steering system variable does satisfy the fitness criterion, determining a road surface friction coefficient based on at least one of the estimated parameters.

Methods and systems for estimating road surface friction

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West Bloomfield, MI, United States of America

Yingmei Si