Title: Estimation of brake pressure and tyre-road friction during ABS activation

Authors: Nenggen Ding; Guizhen Yu; Weida Wang

Addresses: School of Transportation Science and Engineering, Beihang University, Beijing 100191, China. ' School of Transportation Science and Engineering, Beihang University, Beijing 100191, China. ' School of Transportation Science and Engineering, Beihang University, Beijing 100191, China

Abstract: Anti-lock Braking System (ABS) control algorithm and diagnostic function rely heavily on information of road friction coefficients and brake cylinder pressure. To provide a more efficient and reliable means of friction and pressure estimation, an algorithm based on wheel speed signals and control commands for hydraulic valve operation is proposed. Estimated results are achieved by comparing the sums of squared speed errors between the measured wheel speeds and those based on a brake pressure model and wheel dynamics. Performance of the algorithm is evaluated using ABS test data under various braking conditions.

Keywords: active safety systems; vehicle safety; brake pressure modelling; brake pressure estimation; TRFE; tyre–road friction estimation; ABS; anti-lock braking systems; road friction coefficients; vehicle design; wheel speed signals; wheel speed control; hydraulic valves; wheel dynamics.

DOI: 10.1504/IJVD.2012.045921

International Journal of Vehicle Design, 2012 Vol.58 No.1, pp.33 - 45

Available online: 17 Mar 2012 *

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