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The Influence of Braking Efficiency on the Probability of Wheel Lockup
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English
Abstract
A method for calculating the probability of wheel lock occurring during braking with passenger cars is presented. The method combines (1) the probability distribution of vehicle deceleration during braking, (2) the probability distribution of tire-road friction exhibited by the general road system, and (3) the braking efficiency level of the vehicle, to predict the probability of the occurrence of wheel lockup during a given braking event Results are presented employing the constituent probability data available in the open literature. These results predict that lockup events are very rare for typical drivers operating vehicles of 80% braking efficiency or better. As braking efficiency falls, the frequency of occurrence of lockup rises rapidly. At braking efficiency levels as low as 50%, typical drivers would experience lockup about once a month or once every 35 miles of travel on wet roads. A general observation is made that exponentially rising rate of failure is to be expected as system performance qualities degrade from the norm. Findings of several other researchers are noted which confirm this general observation.
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Authors
Citation
Ervin, R. and Winkler, C., "The Influence of Braking Efficiency on the Probability of Wheel Lockup," SAE Technical Paper 870334, 1987, https://doi.org/10.4271/870334.Also In
References
- Carpenter N. “Some measurements of brake usage in a high-speed saloon car,” Proceedings of the institution of Mechanical Engineers, Automobile Division 241 258 1956
- Giles, C.G. “The skidding resistance of roads and the requirements of modern traffic,” Proceedings of the Institution of Civil Engineers, 6 216 242 1956
- Krummer, H.W. Meyer W.E. “Tentative skid-resistance requirements for main rural highways,” International Colloquim on the interrelation of Skidding Resistance and Traffic Safety on Wet Roads 1968
- Mortimer, R.G. et al. “Brake force requirements study: driver-vehicle braking performance as a function of brake system design variables,” Final Report of the Highway Safety Research institute on Contract No. FH-11-6952 1970
- Olson, P.L. et al. “Parameters affecting stopping sight distance,” Final Rept., NCHRP Rept. No. 270 1984
- Farber, E. et al. “Determining pavement skid resistance requirements at intersections and braking sites,” Franklin institute Philadelphia, Pa. NCHRP Report #154 1974
- Schulze, K.-H. et al. “Skidding accidents, friction numbers, and the legal aspects involved,” 2nd international Skid Prevention Conference, Transportation Research Record #623 1977 1 10
- Rouques, G. Lucas J. “Modem methods for surveillance of wet roads,” Revue Generale des Routes et des Aerodromes, Cycle Formation Permanence, 1975
- Missouri State Highway Department “An investigation of Skid Resistance in Missouri,” Final Rept., NCHRP Project 73-3 1973
- Hankins, K.D. “A program for reducing skidding accidents during wet weather,” Transportation Research Record #622 1977 72 84
- Holbrook, L.F “Prediction of wet surface intersection accidents from weather and skid test data,” Transportation Research Record #623 1977 20 39
- United States vs. General Motors Corporation Civil Action No. 83-2220 U.S. Distric Court Washington, D.C.
- Report of the PIARC Technical Committee on Slipperiness and Evenness to the XVth World Road Congress Mexico City 1975
- Schulze, K. “Unfallzahlen und strassengriffigkeit, Untersuchungen uber die Verkehrssicherheit bei Nasse,” Strassenbau und Strassenverkehrstechnick, West Germany 1975 3 32
- Sauterey, R “Contribution to the discussion, 7th question, technical committee on slipperiness.” Report of the Proceedings , XIV World Road Congress Prague 1971 330 333
- Ervin, R.D. “The influence of size and weight variables on the roll stability of heavy duty trucks,” SAE Paper No. 831163 1983