EP 1483143 A1 20041208 - METHOD FOR DETERMINING A MAXIMUM COEFFICIENT OF FRICTION
Title (en)
METHOD FOR DETERMINING A MAXIMUM COEFFICIENT OF FRICTION
Title (de)
VERFAHREN ZUM ERMITTELN EINES MAXIMALEN REIBWERTES
Title (fr)
PROCEDE PERMETTANT DE DETERMINER UN COEFFICIENT DE FROTTEMENT MAXIMAL
Publication
Application
Priority
- DE 10208815 A 20020301
- EP 0301967 W 20030226
Abstract (en)
[origin: WO03074337A1] Currently available systems for regulating driving dynamics, such as for example ESP or TCS, require in the driving dynamical limit range information about the actual maximum coefficient of friction ( mu -max) between tires and roadway to function reliably. A proven approach is to use, once the regulation is active, the actual utilization of grip as the maximum coefficient of friction. The invention relates to a method for determining the actual maximum coefficient of friction ( mu -max) independently from the activation of the regulation. According to the inventive method, values (C_x, C_y) are permanently determined that represent the utilization of grip in the longitudinal and/or transverse direction, based on measured and/or estimated variables that represent the actual longitudinal forces (F_x), lateral forces (F_y) and vertical forces (F_z) acting upon the individual wheels and tires, while using the measured or calculated actual state variables that represent the slip angle ( alpha ) and/or the slip angle velocity ( alpha ) and/or the longitudinal slip ( gamma ) and/or the longitudinal slip velocity ( gamma ). The determined values (C_x, C_y) are compared with threshold values (S_x, S_y) and are evaluated to determine the maximum coefficient of friction ( mu -max) while using additional auxiliary variables if the resulting values of comparison are smaller than the threshold values.
IPC 1-7
IPC 8 full level
B60R 16/02 (2006.01); B60T 8/172 (2006.01); B60T 8/1763 (2006.01)
CPC (source: EP US)
B60T 8/1725 (2013.01 - EP US); B60W 40/068 (2013.01 - EP US); B60T 2210/12 (2013.01 - EP US); B60T 2240/03 (2013.01 - EP US); B60W 2510/205 (2013.01 - EP US); B60W 2520/10 (2013.01 - EP US); B60W 2520/105 (2013.01 - EP US); B60W 2520/125 (2013.01 - EP US); B60W 2520/14 (2013.01 - EP US); B60W 2520/26 (2013.01 - EP US); B60W 2520/28 (2013.01 - EP US); B60W 2530/20 (2013.01 - EP US)
Citation (search report)
See references of WO 03074337A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR
DOCDB simple family (publication)
WO 03074337 A1 20030912; DE 10208815 A1 20030918; DE 10208815 B4 20110519; EP 1483143 A1 20041208; JP 2005518987 A 20050630; US 2005234628 A1 20051020
DOCDB simple family (application)
EP 0301967 W 20030226; DE 10208815 A 20020301; EP 03743341 A 20030226; JP 2003572822 A 20030226; US 50626805 A 20050609