A variable time gap feedback policy for string stable adaptive cruise control
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Date
2024-05
Publication Type
Conference Paper
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yes
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Abstract
In vehicle platooning, time gap settings of Adaptive Cruise Control (ACC) systems have a significant impact on car-following dynamics, traffic capacity and road safety. Traffic capacity increases with the reduction of the average time headway; however, this raises concerns of safety and string stability. This work presents a variable time gap feedback control strategy to balance following a minimum time gap setting under equilibrium car-following conditions for increased traffic capacity; and guaranteeing string stability to attenuate disturbances away from the equilibrium flow. This is achieved using nonlinear H ∞ control; where a variable time gap component is set as the manipulated control signal. Also, a constant time gap component is present which dominates during car-following equilibrium and is prescribed to the minimum value. Numerical simulations demonstrate that the proposed scheme yields less perturbations in space headway compared to its constant time-gap ACC baseline; showcasing the potential benefits of better road utilization and increased capacity from a traffic perspective.
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published
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STRC
Event
24th Swiss Transport Research Conference (STRC 2024)
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Subject
Adaptive cruise control (ACC); String stability; Variable time gap; Nonlinear H ∞ control
Organisational unit
08686 - Gruppe Strassenverkehrstechnik
02655 - Netzwerk Stadt u. Landschaft ARCH u BAUG / Network City and Landscape ARCH and BAUG