Method for determining a road friction value
AssigneeMagna PT B. V. & Co. KG
InventorsSebastian Crump, Sören Wenzel
Life of this patent
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Abstract
A method for determining a current road friction value (μroad) using a control device in a motor vehicle continuously calculates a current friction value demand (μdem) by the control device. A current tire stiffness (St) is determined from the calculated current friction value demand (μdem) and a current tire slip (Slip), and the current road friction value (μroad) is determined from the current tire stiffness (St) by way of a stored table (T), which maps tire stiffnesses (St) to road friction values (μroad).
Claims16
A method for determining a current road friction value by a control unit in a motor vehicle, the method comprising:
- continuously calculating, by the control unit, a current friction value demand from a current driving wheel torque and a currently prevailing axle load,
- determining a current tire stiffness from the calculated current friction value demand and a current tire slip, and
- determining a current road friction value from the current tire stiffness by way of a stored table, which maps tire stiffness to road friction values.
Dependencies are inferred from the claim text.