Global Patent Index - EP 1483143 A1

EP 1483143 A1 2004-12-08 - 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

EP 1483143 A1 (DE)

Application

EP 03743341 A

Priority

  • DE 10208815 A
  • EP 0301967 W

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 (main, further and additional classification)

B60T 8/00

IPC 8 full level (invention and additional information)

B60R 16/02 (2006.01); B60T 8/172 (2006.01); B60T 8/1763 (2006.01)

CPC (invention and additional information)

B60W 40/068 (2013.01); B60T 8/1725 (2013.01); B60T 2210/12 (2013.01); B60T 2240/03 (2013.01); B60W 2510/205 (2013.01); B60W 2520/10 (2013.01); B60W 2520/105 (2013.01); B60W 2520/125 (2013.01); B60W 2520/14 (2013.01); B60W 2520/26 (2013.01); B60W 2520/28 (2013.01); B60W 2530/20 (2013.01)

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

EPO simple patent family

WO 03074337 A1 20030912; DE 10208815 A1 20030918; DE 10208815 B4 20110519; EP 1483143 A1 20041208; JP 2005518987 A 20050630; US 2005234628 A1 20051020

INPADOC legal status


2007-01-24 [18W] WITHDRAWN

- Effective date: 20061214

2006-09-13 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20060811

2004-12-08 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20041001

2004-12-08 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): 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