String Stability Under Actuator Saturation on Straight Level Roads: Sufficient Conditions and Optimal Trajectory Generation

The heterogeneity of vehicles is an important factor when realizing cooperative adaptive cruise control (CACC) in practice. Specifically, it has to be considered that platoons generally consist of vehicles with both different dynamic properties and actuator limits on the engine and braking force, wh...

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Bibliographic Details
Published in:IEEE transactions on intelligent transportation systems 2022-12, Vol.23 (12), p.1-11
Main Authors: Bingol, Hilal, Schmidt, Klaus Werner
Format: Article
Language:English
Subjects:
actuator saturation
Actuators
Adaptive control
Computational modeling
Cooperative adaptive cruise control (CACC)
Cooperative control
Cruise control
Engines
Force
force bound
Heterogeneity
minimum-time optimal control
Numerical stability
Saturation
Stability
Stability criteria
string stability
Strings
Trajectory
Trajectory analysis
Trajectory optimization
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Summary:The heterogeneity of vehicles is an important factor when realizing cooperative adaptive cruise control (CACC) in practice. Specifically, it has to be considered that platoons generally consist of vehicles with both different dynamic properties and actuator limits on the engine and braking force, which is expected to have a negative impact on important properties such as string stability. Accordingly, the subject of this paper is the preservation of string stability for CACC in heterogeneous vehicle strings with potential actuator saturation. To this end, the paper formulates a velocity-dependent force bound that enables the derivation of sufficient conditions for preserving string stability during velocity changes of heterogeneous platoons. These conditions are then used for the analytical computation of trajectories for time-optimal velocity changes. The formal results of the paper are supported by an illustrative simulation study.
ISSN:1524-9050
1558-0016
DOI:10.1109/TITS.2022.3213554