Title:
車両ステアリング・システムに関する改良
Document Type and Number:
Japanese Patent JP4119563
Kind Code:
B2
Abstract:
An electrical power assisted steering system is disclosed having a boost curve (5) which has inverse symmetry about a zero input torque value, each half of the boost curve (5) comprising a first portion (10) defined by a first polynomial equation between a zero value and a first value, and a second portion (11) defined by a second polynomial between a second value and a third value, in which the gradient of the first portion of the curve at the first value is equal to the gradient of the second portion of the curve at the second value. By storing values for the first, second and third values and the gradient of each polynomial at those values a smooth boost curve can be defined by storing only a small amount of parameters.
Inventors:
Russell Wilson Jones
Andrew James Stephen Williams
Andrew James Stephen Williams
Application Number:
JP9517899A
Publication Date:
July 16, 2008
Filing Date:
April 01, 1999
Export Citation:
Assignee:
T. W. Lucas Varity Electric Steering Limited
International Classes:
B62D6/00; B62D5/04; B62D101/00; B62D119/00
Domestic Patent References:
| JP1159203A | ||||
| JP63168162U | ||||
| JP62247968A | ||||
| JP5963264A | ||||
| JP6234854A | ||||
| JP8175406A |
Attorney, Agent or Firm:
Kazuo Shamoto
Shosuke Imai
Tadashi Masui
Tadahiko Kurita
Yasushi Kobayashi
Fumitoshi Nishiyama
Shosuke Imai
Tadashi Masui
Tadahiko Kurita
Yasushi Kobayashi
Fumitoshi Nishiyama