Tire grip sensor and control system using the sensor

Details Tire grip sensor and control system using the sensor Tire grip sensor and control system using the sensor

2007-10-02

2007-10-02

Barlow, John (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system

Speed

C701S071000, C701S074000, C701S090000, C073S146000, C702S075000

Reexamination Certificate

active

11196298

ABSTRACT:
A system for directly measuring tire grip conditions is provided which can measure a skidding condition with no need of applying a vibration. A tire rotation speed sensor comprising a detection gear and a magnet sensor is mounted to a rotating shaft of a tire. An output of the tire rotation speed sensor is analyzed in time-frequency domain to detect vibrations caused by slips, thereby determining tire grip conditions, such as a slip ratio and a slip angle. By detecting fluctuations in rotation based on the cause-effect relation between the occurrence of tire slips and the occurrence of fluctuations in rotation, the tire slips can be directly detected. Therefore, the tire grip conditions can be confirmed with high accuracy.

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Kent Seki et al. (Analysis of wavelet correlation between tyre sounds and tread patterns), 0-7803-8812-7/05 c2005 IEEE, pp. 241-246).
Katsuhiro Asano, et al., “Wheel Vibration Phenomenon and Braking Force Maximization Control”, Toyota Central R&D Labs., Inc., R&D Review, vol. 34, No. 2, 1999.6.

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