(19)
(11)EP 1 304 278 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
11.02.2004 Bulletin 2004/07

(43)Date of publication A2:
23.04.2003 Bulletin 2003/17

(21)Application number: 02079005.1

(22)Date of filing:  27.09.2002
(51)Int. Cl.7B62D 6/00
// B62D101:00, B62D105:00, B62D113:00, B62D137:00, B62D151:00
(84)Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
Designated Extension States:
AL LT LV MK RO SI

(30)Priority: 18.10.2001 US 982217

(71)Applicants:
  • Delphi Technologies, Inc.
    Troy, MI 48007 (US)
  • General Motors Corporation
    Detroit, Michigan 48265-3000 (US)

(72)Inventors:
  • Klein, Steven D.
    Munger, MI 48747 (US)
  • Wendling, Scott M.
    Montrose, MI 48457 (US)
  • Grougan, Paul A.
    Novi, MI 48374 (US)
  • Sherman, Scott P.
    Fenton, MI 48430 (US)
  • Rodden, Eugene A.
    Gilbert, AZ 85234 (US)
  • Lemmer, Roderick L.
    Birmingham, MI 48009 (US)

(74)Representative: Denton, Michael John 
Delphi European Headquarters, 64 avenue de la Plaine de France, Paris Nord II, BP 60059, Tremblay-en-France
95972 Roissy Charles de Gaulle Cédex
95972 Roissy Charles de Gaulle Cédex (FR)

  


(54)Four wheel steering compensation for low coefficient of friction surface


(57) A method directed to improving the stability of a motor vehicle (12) having front and rear steering capabilities includes determining a coefficient of friction of the road surface with which the motor vehicle (12) is engaged and adjusting a phase gain function of a rear steering mechanism (16) to compensate for the steerability of the motor vehicle (12) over the road surface. A system (10) for improving the stability of a motor vehicle (12) having front and rear steering capabilities includes a control unit (18), a front steering mechanism (14) in informational communication with the control unit (18), and a rear steering mechanism (16) in informational communication with the control unit (18). The rear steering mechanism (16) is responsive through the control unit (18) to road conditions of the road surface.