Method for estimating a reference vehicle speed of a four-wheel

Details Method for estimating a reference vehicle speed of a four-wheel Method for estimating a reference vehicle speed of a four-wheel

1991-01-30

1992-05-05

Raevis, Robert

Measuring and testing

Frictional resistance, coefficient or characteristics

G01M 1500

Patent

active

051096943

ABSTRACT:
The present invention relates to a method for estimating vehicle speeds independently on front and rear wheels of a four-wheel motor vehicle on the basis of front wheel speeds and rear wheel speeds, for use as a basis for determining slip rates for front and rear wheels. According to the first method of the invention, a reference wheel speed determined by the vehicle speed as estimated from the left and right wheel speeds cannot be unnecessarily increased during turning of the vehicle. According to the second and third methods of the invention, the estimated vehicle speed largely does not deviate from the actual vehicle speed in the event of a phase difference of variants produced between the left and right wheels due to an anti-lock control during the turning of the vehicle. According to other features of the invention, corrections can be performed with respect to the inner and outer wheel differences during turning of the vehicle based on an index representative of the traveling speed, lateral acceleration of the vehicle and steering angle.

REFERENCES:
patent: 3930688 (1976-01-01), Rau et al.
patent: 4042059 (1977-08-01), Bertolasi
patent: 4322809 (1982-03-01), De Vlieg et al.
patent: 4526426 (1985-07-01), Sato et al.
patent: 4877295 (1989-10-01), Yoshino

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