In proceedings ASME Intl Mech. Engng Cong. and Expo. (IMECE) Design Engng Div., DE series Vol. 106, pp. 85-92, Orlando, November 2000.
Modeling, analysis, and experimental testing of ABS systems with load shifting
Val Mills, Bernard Samuels, John Wagner, James Smith, and Richard A. Layton

The steerability and stability of vehicles must be maintained during emergency stopping and evasive driving maneuvers on degraded roads. The introduction of antilock brake and traction control systems has expanded the envelope of safe vehicle operation. ABS devlopment has traditionally depended on extensive in-vehicle testing, at proving grounds, which contribute to lengthy product development cycles. However, recent attention has focused on laboratory wheel testers and hardware-in-the-loop strategies to emulate test conditions in a controlled setting to shorten product design time and address critical safety issues. In this paper, the effect of transient load shifting due to cargo movement on ABS system performance will be studied. Analytical and empirical mathematical models are presented to describe the chassis, tire/road interface, wheel, and brake modulator dynamics. These models have been integrated into a simulation to allow the study of transient weight transfers on the vehicle's overall stopping distance and steerability. Experimental test results will be gathered on a single wheel tester which has been fabricated. The analysis of the numerical and experimental results will allow the ABS system performance to be predicted for various loading conditions and establish an envelope for safety critical testing during the product development process.

©2000 American Society of Mechanical Engineers.

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Richard A. Layton
Last modified: 29 Jun 02