Title:
ROAD SURFACE FRICTION COEFFICIENT ESTIMATION DEVICE
Document Type and Number:
Japanese Patent JP3401879
Kind Code:
B2
Abstract:
PURPOSE: To provide a road surface friction coefficient estimation device which can estimate not only the momentary value but also the peak value of a road surface friction coefficient only with wheel speed information.
CONSTITUTION: In the case of a low-μ path, an actual turning center deviation from the turning center of a so called Ackerman geometry is larger as compared with the case of a high-μ path. That is, as μ becomes lower, the turning center moves toward a front wheel side and hence the relationship between wheel speeds VWFL-VWRR becomes the results as shown in Fig. 5 according to the change in the turning posture of the vehicle. Based on the relationship, the relationship among the road surface μ, a difference &utri Vx between front and rear wheels, centripetal acceleration Gy is stored in advance and the road surface μ determined by the μ peak value can be estimated by referring to the map and then retrieving the corresponding road surface μ based on the calculated speed difference &utri Vx between the front and rear wheels and the centripetal acceleration Gy, thus accurately discriminating the high- and low-μ paths.
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Inventors:
Takashi Watanabe
Junji Mizutani
Junji Mizutani
Application Number:
JP31851793A
Publication Date:
April 28, 2003
Filing Date:
December 17, 1993
Export Citation:
Assignee:
株式会社デンソー
International Classes:
G01N19/02; B60R16/02; B60T8/172; B60T8/1763; B60T8/58; G01M17/007; (IPC1-7): B60R16/02; B60T8/58; G01N19/02
Domestic Patent References:
| JP5238404A | ||||
| JP4135923A | ||||
| JP36442A | ||||
| JP3269240A | ||||
| JP62257043A | ||||
| JP62201046U |
Attorney, Agent or Firm:
Tsutomu Adachi
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