Method and circuit configuration for determining a frictional va

Details Method and circuit configuration for determining a frictional va Method and circuit configuration for determining a frictional va

1994-06-22

1996-05-07

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Specific mu determination

180197, 188181A, 303174, 303166, 36442602, B60T 832

Patent

active

055139078

ABSTRACT:
A frictional value between a motor vehicle tire and a road surface is determined for use in an ABS system or a traction control system. Various sensors at the automobile ascertain the vehicle speed and the brake pressure at individual wheels. The angular acceleration of the wheel is calculated from the angular velocity thereof. A wheel slip is calculated from the vehicle speed and from the angular acceleration. The dependency of the coefficient of friction is approximated from the wheel slip with a non-linear approximation equation. The current estimation value for the coefficient of friction is estimated with a recursive estimation algorithm from measurement values previously ascertained during a preceding measuring instant.

REFERENCES:
patent: 4794538 (1988-12-01), Cao et al.
Research Disclosure, vol. 270, No. 072, Oct. 10, 1986, pp. 633-634 (Anonymous) "Estimation of Road Surface Coefficient of Friction".

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