Rear axle steering (RAS) at low speed is available in heavy trucks to improve their manoeuverability and reduce tyre wear; by extending the functionality ot the existing RAS to high speed turning and split-mu braking, considerable safety benefits and enhancement in driver comfort can be gained. In this study, a RAS System was developed and simulated in Mutlab-Simulink which showed encouraging results. Furthermore, the developed system was implemented on a Volvo Truck and tested in a series of split-mu braking and ISO double lane change manoeuvers. The obtained results conform to the expectations. The tests showed that yaw rate error can be reduced by 64 % in high-speed turnings for a truck with RAS compared to the conventional truck. The driver workload will also be decreased considerably. The split-mu braking tests indicated that the braking distance can be reduced by at least 10 % with implementation of the RAS system along with a more aggressive ABS, while the required driver steering input to keep the truck in straight direction do not increase.
The effectiveness of rear axle steering on the yaw stability and responsiveness of a heavy truck
2008
8 Seiten, 6 Bilder, 2 Tabellen, 11 Quellen
Conference paper
English
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