Stability Control for Driverless Commercial Vehicles
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Wabco
Stability Control for Driverless Commercial Vehicles In order to be able to use driverless commercial vehicles in all parts of the world in hot, wet and slippery conditions, ESC systems for vehicle dynamics must be improved. ZF Group Commercial Vehicle Control Systems proposes the use of a trajectory interface that regulates driving stability more precisely. It also makes it possible to prevent critical situations in advance. The integration of an active steering system further enhances the quality of long-haul transport truck stabilization.
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A U T HOR S DRIVERLESS TRUCKS NEED A TRA JECTORY INTERFACE
Dr.-Ing. Jonas Böttcher is Employee in the Product Innovation Team at ZF Group Commercial Vehicle Control Systems in Hanover (Germany).
Dr.-Ing. Thomas Dieckmann is Technology & Innovation Officer at ZF Group Commercial Vehicle Control Systems in Hanover (Germany).
Dr.-Ing. Klaus Plähn is Employee in the Product Innovation Team at ZF Group Commercial Vehicle Control Systems in Hanover (Germany). ATZ worldwide 09|2020
Automated commercial vehicles (according to SAE levels 3 to 5) are currently being operated in areas with predominantly dry weather and low-density traffic, for example in the desert of Arizona (USA), where external factors have little impact on vehicle behavior in order to test them as an entire system. However, the weather and traffic conditions around the world are not always as favorable as in regions like Arizona, and in order to be able to use driverless vehicles in areas like Rovaniemi (Finland), which is wet and has packed snow, stability control systems are a must, FIGURE 1. These systems are designed to stabilize the vehicle in vehicle-dynamics-critical driving conditions, such as on slippery roads or in situations with high lateral acceleration, and could even prevent these hazardous situations from happening in the first place. Such novel stability control systems, as they are being developed by Wabco (acquired by ZF and now part of the ZF Group) for automated driving, support a “Virtual Driver,” just like contem-
porary Electronic Stability Control (ESC) systems help human drivers in conventional commercial vehicles. The use of a trajectory interface is required for this purpose. It controls driving stability, even preventing the onset of critical situ ations. However, safe automation can still benefit from additional new functions of the extended stability control: Integrating an active steering system into the actuator concept enhances the support for µ-split maneuvers and improve the fail-safe ESC fallback level will also raise stability and, as such, the safety of self-driving vehicles. Last but not least, the ability to activate individual brake interventions on the front axle wheels allows an excellent fallback level in case the active steering system fails. SPECIAL ESC SYSTEMS FOR AUTONOMOUS COMMERCIAL VEHICLES
Contrary to Anti-lock Braking Systems (ABS), the ESC systems cannot simply be integrated into driverless commercial vehicles. That is because the ESC functio
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