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Prediction of Heavy Truck Stopping Distance and Vehicle Behavior using Real-time HIL and SIL Simulation
Technical Paper
2008-01-2604
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Due to the stopping distance disparity between heavy trucks and passenger cars, a proposed amendment to FMVSS 121 (Federal Motor Vehicle Safety Standards) will require heavy truck manufacturers to reduce truck-tractor stopping distances.
A typical FMVSS 121 stopping distance test takes two to three weeks to complete. It is not practical or cost effective to test all brake, tire, wheel base, and suspension combinations. The ABS (anti-lock brake system) controller also contributes greatly to the complexities of the brake system. A new method has been developed by Navistar, Inc. utilizing extensive computer simulation to study the parameters that affect stopping distance.
The simulation model utilizes both real-time HIL (hardware-in-the-loop) and SIL (software-in-the-loop) simulation technologies. The ABS ECU (Electronic Control Unit) was coupled in the simulation through HIL. Commercial vehicle dynamics software is integrated with simulation through SIL to calculate the stopping distance and predict the vehicle directional behavior. Detailed brake pneumatic system and brake torque sub-models were developed in house. The results generated by the model show very good correlation with the physical tests.
This paper assumes the reader has a computer simulation background and has some familiarity with HIL and SIL simulation environment.
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Citation
Chen, C., Wagner, G., Pace, M., and Rogness, T., "Prediction of Heavy Truck Stopping Distance and Vehicle Behavior using Real-time HIL and SIL Simulation," SAE Technical Paper 2008-01-2604, 2008, https://doi.org/10.4271/2008-01-2604.Also In
Advancements in Steering Systems, Braking Systems, and Advanced Chassis Control and Rollover Stability
Number: SP-2216; Published: 2008-10-07
Number: SP-2216; Published: 2008-10-07
References
- National Highway Traffic Safety Administration, Department of Transportation: “49CFR 571.121” http://a257.g.akamaitech.net/7/257/2422/13nov2006 1500/edocket.access.gpo.gov/cfr_2006/octqtr/pdf/49 cfr571.121.pdf
- Johnson L. K. Fancher P. S. Gillespie T. D. “An Empirical Model for the Prediction of the Torque Output of Commercial Vehicle Air Brakes” Highway Safety Research Institute, the University of Michigan 1978
- U.S. Department of Transportation, National Highway Traffic Safety Administration: “Laboratory Test Procedure for FMVSS121D Air Brake System-Dynamometer” 1990