Gm Global Technolgoy Operations, Inc.

Simon E Zimmerman

Nikolai K Moshchuk

Qingrong Zhao

Qi Zhang

Yadollah Sabri

Steven T Schweitzer

Yingmei Si

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.

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Poway, CA, United States of America

Simon E Zimmerman