System for estimating friction coefficient between wheels of motor vehicle and roadway, has calculation unit receiving additional signals that represents deceleration torque exerted by retarder on wheel axle of motor vehicle

摘要

The system has a storage unit (250) comprising a reference table representing a categorization of inclinations (k) in friction coefficient in two different size categories. A calculation unit (200) receives additional signals (Dret, Dexb, Dbr) that represents a deceleration torque exerted by a retarder on a wheel axle of a motor vehicle and by a exhaust brake on a drive axle of the vehicle, or brake pressure exerted in a brake system of the vehicle. The calculation unit determines the inclinations based on the additional signal. Independent claims are also included for the following: (1) a method for estimating a friction coefficient between wheels of a motor vehicle and a roadway (2) a computer program for performing a method for estimating a friction coefficient between wheels of a motor vehicle and a roadway (3) a computer readable medium for performing a method for estimating a friction coefficient between wheels of a motor vehicle and a roadway.