Physical quantity estimating apparatus and tire state...

Details Physical quantity estimating apparatus and tire state... Physical quantity estimating apparatus and tire state...

2005-03-29

2005-03-29

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Tire, tread or roadway

C701S080000

Reexamination Certificate

active

06871530

ABSTRACT:
A physical quantity estimating apparatus and method that detects an acceleration and deceleration rate of a vehicle body and a rotational velocity of a wheel, estimates at least one of a tire radius of each wheel, a road surface μ gradient, and a spring constant of a combination spring which combines spring elements, with a distribution ratio of braking force and driving force to a front and rear wheel and a distribution ratio of a load on each wheel that is corrected according to the detected acceleration and deceleration rate, as known values, based on a wheel speed difference of any two wheels, during acceleration and deceleration of a vehicle, of an ideal vehicle model that takes into consideration a tire torsional spring element and a suspension longitudinal spring element and estimates a tire type based on the estimated road surface μ gradient and spring constant.

REFERENCES:
patent: 5588721 (1996-12-01), Asano et al.
patent: 5771480 (1998-06-01), Yanase
patent: 6640623 (2003-11-01), Ono et al.
patent: 0 783 983 (1997-07-01), None
patent: A 9-188114 (1997-07-01), None
Y. Nakao et al., “Estimation of Friction Levels Between Tire and Road,” Society of Automotive Engineers, Inc., 2002, pp. 1-5.

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