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Diagnosing Brake System Compliance Issues on the Race Track with System Modeling and the Mahalanobis-Taguchi System
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2007 by SAE International in United States
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One of the most apparent and often most objectionable characteristics of brake system performance during race track usage is the increase in pedal travel caused by lining taper wear, lining compression, and knockback. However, it is difficult to measure compliance on individual brake corners during race track usage, and complex apply profiles make it challenging to even quantify the overall change in pedal feel of the brake system.
This paper proposes a methodology by which the measured hydraulic pressure profiles of each brake corner during a brake apply are related to overall brake pedal travel. Using regressed parameters describing these relationships, a Mahalanobis-Taguchi ‘Normal Space’ is constructed for a set of brake applies with known ‘good’ pedal feel. This provides a basis for computing the Mahalanobis Distance for brake applies in a data set under evaluation. Brake applies with a high Mahalanobis Distance can be ‘flagged’ for further evaluation.
A brake system model, with a hydraulic model for each brake corner circuit, and an apply system model, is correlated to data measured on the test vehicle. This model can then be used to show how the rate of pressure rise at each brake corner versus pedal travel changes with various combinations of brake corner compliance issues.
The resultant data can be used to determine if one or more brake corners incurred a change in compliance, to estimate the severity of the change in compliance, and to identify extreme cases such as knockback.
CitationAntanaitis, D., "Diagnosing Brake System Compliance Issues on the Race Track with System Modeling and the Mahalanobis-Taguchi System," SAE Technical Paper 2007-01-0588, 2007, https://doi.org/10.4271/2007-01-0588.
- Pang P. Agnew D. “Brake System Component Characterization for System Response Performance: A System Level Test Method and Associated Theoretical Correlation” SAE Paper 2004-01-0726
- Heywood J. Internal Combustion Engine Fundamentals McGraw-Hill, Inc 1988 225 228
- Antanaitis D. “Measuring and Characterizing Brake System Performance During Race Track / High Energy Driving Conditions” SAE Paper 2005-01-0790
- Taguchi G. Chowdhury S. Wu Y. The Mahalanobis-Taguchi System McGraw-Hill 2001
- Taguchi G. Jugulum R. The Mahalanobis-Taguchi Strategy John Wiley and Sons 2002
- Lehmann E. L. d'Abrera H. J. M. Nonparametrics: Statistical Methods Based On Ranks 1975