发明名称 |
Device for estimating road friction state |
摘要 |
A device for estimating a road friction state in which a friction state of a wheel with respect to a road surface can be estimated accurately. A bandpass filter extracts, from a wheel speed signal detected by a wheel speed detecting unit, a portion of the wheel speed signal in a predetermined range which includes a torsion resonance point at which a frequency is greater than a low frequency regions. A vibration level computing unit computes a vibration level of the wheel speed signal. A road friction state estimating unit estimates the friction state of the wheel with respect to the road surface on the basis of a vibration level computed by the vibration level computing unit and an estimated value of a road mu slope computed by a mu slope computing unit, and on the basis of a relationship between the two determined for each road surface state. <IMAGE> |
申请公布号 |
EP1097850(A3) |
申请公布日期 |
2002.09.04 |
申请号 |
EP20000123174 |
申请日期 |
2000.10.25 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
ITO, SHOJI;YAMAMOTO, MASAKI;UMENO, TAKAJI;ASANO, KATSUHIRO;AMANO, YASUSHI;ONOZAWA, SATORU;FUJIMOTO, SHUSAKU |
分类号 |
G01N19/02;B60R16/02;B60T8/172;G01M17/02 |
主分类号 |
G01N19/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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