Device for a vehicle for estimating friction coefficient of...

Details Device for a vehicle for estimating friction coefficient of... Device for a vehicle for estimating friction coefficient of...

2006-06-06

2006-06-06

Hoff, Marc S. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Performance or efficiency evaluation

C701S080000

Reexamination Certificate

active

07058541

ABSTRACT:
A correlation coefficient computing unit receives front-left and front-right wheel-accelerations from high-pass filters, each having a driver-operating component removed therefrom, and computes a correlation coefficient therebetween. A computing-unit of upper and lower limits of a correlation coefficient of a population sets upper and lower limits of a correlation coefficient of a population. First and second correction-gain setting units set first and second correction-gains varying in accordance with running and driving states, respectively. A correlation coefficient computing unit of a population computes a correlation coefficient of a population of this time based on the correlation coefficients computed as above, a correlation coefficient of a population of the previous time, the upper and lower limits, and the first and second correction-gains. A coefficient of friction on road surface estimating unit estimates a coefficient of friction on road surface by comparing the correlation coefficient of the population of this time with a determining threshold value previously set according to the running state.

REFERENCES:
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patent: 5929534 (1999-07-01), Pickett
patent: 6556912 (2003-04-01), Matsuno
patent: 1 302 378 (2003-04-01), None
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patent: 11-139293 (1999-05-01), None

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