What is it about?
In order to obtain consecutive vehicle safety states (CVSSs) for a vehicle safety warning system (VSWS), a novel CVSS calculation scheme, tightly coupling the vehicle’s cyber system and its physical dynamics (the cyber–physical system (CPS)), has been developed. The proposed scheme objectively divides the dynamic vehicle distance changes into a cyber process and a physical process, defines the notions of minimum safety distance and safety constants and then improves the dynamic vehicle safety distance calculation scheme using the vehicle velocity, acceleration, the velocity difference and other parameters in the consecutive vehicle distance for scenarios of staying in the same lane and changing to a different lane. The simulation results show that the proposed scheme is practical and effective, and can offer advice for VSWS designs.
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Why is it important?
A practical and effective CVSS calculation scheme using the CPS perspective is thus proposed for detecting whether or not a vehicle is endangered and generating EWMs based on the out-comes of the scheme. In the proposed approach, the MSD and safety constants, considering velocity, acceleration and velocity difference, are used to calculate endangered vehicles states by dividing the scenarios into same-lane and different-lane cases.
Perspectives
A novel consecutive vehicle safety state calculation scheme is proposed from a cyber–physical system (CPS) perspective through calculating the dynamic safety distance using the notions of minimum safety distance and safety constants for a platoon of vehicles travelling in the same lane and in three lane-change scenarios. The simulation results show that the proposed scheme is more practical and effective than commonly used safety distance calculating models. Although the proposed scheme can accurately calculate vehicle safety distance and significantly improve the depend- ability of emergency warning messages (EWMs), there are still aspects to improve (e.g. how each component behaves and how the performance of the different components are tied together in a CPS). This is indeed one of the great challenges of CPS research – more dependability enhancement tools and methods to obtain specific dependable EWM levels. Future work will involve extending the current scheme and defining the dependability levels to achieve better results.
Hongzhuan ZHAO
Guilin University of Electronic Technology
Read the Original
This page is a summary of: A novel CPS-based vehicle safety state evaluation scheme, Proceedings of the Institution of Civil Engineers - Transport, February 2016, ICE Publishing,
DOI: 10.1680/jtran.14.00058.
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