Volvo Car Corporation

Haldex Brake Products Ab

Haldex Brake Products Aktiebolag

Johan Hulten

Stefan Solyom

Bengt Johan Henrik Jacobson

Fredrik Hans Bruzelius

Nenad Lazic

Jacob Svendenius

Magnus Gaefvert

Magnus Gäfvert

The present invention relates to a yaw stability control system for a vehicle using a steering system and a method of controlling by detecting the occurrence of understeer, determining the degree of understeer after the occurrence of understeer is detected determining if the determined degree of understeer exceeds a threshold value, saving the steering wheel torque value and steering wheel angle value when determined that a calculated drop in steering wheel torque exceeds the threshold value, calculating a guidance torque, a driver-intended steering wheel angle, and updating the steering wheel angle at the start of the guidance torque calculation, applying the guidance torque to the steering of the vehicle, and using the driver-intended steering wheel angle for yaw stability control.

Yaw stability control system

The present invention refers to systems and to methods for determining at least one parameter relating to a tire-to-road contact and/or a relation between a wheel and a vehicle motion. In particular, the present invention refers to systems and to methods for determining the coefficient of friction between a tire and a road surface. For that purpose, the systems and methods according to the invention use new estimation filtering procedures.

Systems and methods for determining a parameter relating a tire-to-road contact and/or a relation between a wheel and a vehicle motion

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Goeteborg, Sweden

Johan Hulten