This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Active Four Wheel Brake Proportioning for Improved Performance and Safety
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2008 by SAE International in United States
Annotation ability available
A vehicle undergoing longitudinal or lateral accelerations experiences load transfer, dynamically changing the normal load carried by each tire. Conventional braking systems are designed only to work adequately over a large range of conditions, but often ignore the dynamic state of the tire's normal load. Fortunately, new developments in braking system hardware give designers more control over the application of braking pressures. By identifying the tires that carry increased normal load, and biasing the braking system toward those tires, total braking force can be increased.
The purpose of this research is to investigate advantages of open-loop load transfer based active brake pressure distribution. By estimating the tractive ability of the tires as a function of measurable vehicle conditions, brake pressure can be applied in proportions appropriate for the current dynamic state of the vehicle, referred to as Active Brake Proportioning (ABP). The result is increased braking ability before the onset of tire lockup (or ABS activation).
In the paper, a mathematical model to predict normal load at each tire is developed, and incorporated into a high fidelity vehicle model. Brake pressure is distributed according to the predicted loads. A series of simulations are conducted using the model to investigate stopping distances under various conditions, vehicle stability during extreme obstacle avoidance maneuvers, and impact on driver steer effort. The results show that ABP can potentially provide significant benefits for both performance and safety.
CitationNantais, N. and Minaker, B., "Active Four Wheel Brake Proportioning for Improved Performance and Safety," SAE Technical Paper 2008-01-1224, 2008, https://doi.org/10.4271/2008-01-1224.
- Limpert, R. 1999 Brake Design and Safety SAE Publishers
- Milliken, W.F. Milliken, D.L. 1995 Race Car Vehicle Dynamics SAE Publishers
- Bosch Robert GMBH Automotive electrics and electronics SAE Publishers
- Welstead, P.E. 1997 Analysis and Redesign of an Antilock Brake System Controller IEE Proceedings - Control Theory and Applications 144 413 326
- Jonner, W.D. Winner, H. Dreilich, L. Schunck, E. 1996 Electrohydraulic brake system - the first approach to brake-by-wire technology SAE Paper 960991
- Roberts, R. Schautt, M. Hartmann, H. Gombert, B. 2003 Modelling and Validation of the Mechatronic Wedge Brake SAE Paper 2003-01-3331
- Roberts, R. Gombert, B. Hartmann, H. Lange, D. Schautt, M. 2004 Testing the Mechatronic Wedge Brake SAE Paper 2004-01-2766
- Maron, C. Dieckmann, T. Hauck, S. Prinzler, H. 1997 Electromechanical Brake System: Actuator Control Development System SAE Paper 970814
- Leffler, H. 1995 The brake system of the new 7 Series BMW with electronic brake and wheel slip control SAE Paper 950792
- Koibuchi, K. Yasamoto, M. Fukada, Y. Inagaki, S. 1996 Vehicle stability control in limit cornering by active brake SAE Paper 960787
- Schenk, D.E. Wells, R.L. Miller, J.E. 1995 Intelligent Braking for Current and Future Vehicles SAE Paper 950762
- The MathWorks, Inc. www.mathworks.com
- Gillespie, T.D. 1992 Fundamentals of Vehicle Dynamics SAE Publishers
- Nantais, N. 2006 Active Brake Proportioning and its Effects on Safety and Performance University of Windsor www.uwindsor.ca/vdc