This paper proposes local ramp metering controllers to be applied in freeways in which there are ... more This paper proposes local ramp metering controllers to be applied in freeways in which there are not sensors measuring the traffic density close to the on-ramps. Since the ramp metering control laws to be applied are based on the value of the traffic densities upstream or downstream the on-ramps and since these densities cannot be measured, the density estimates provided by distributed consensus-based switched observers developed in a previous work are used. In particular, on the basis of the observability properties of the considered freeway system, which is modeled as a piecewise-affine state-dependent system, a switched ramp metering controller based on a distributed observer is proposed. According to the present mode of the freeway system, the local controller of each on-ramp switches between a feedback controller based on the downstream density, a feedforward controller based on the upstream density and a pre-computed control law.
This paper proposes local ramp metering controllers to be applied in freeways in which there are ... more This paper proposes local ramp metering controllers to be applied in freeways in which there are not sensors measuring the traffic density close to the on-ramps. Since the ramp metering control laws to be applied are based on the value of the traffic densities upstream or downstream the on-ramps and since these densities cannot be measured, the density estimates provided by distributed consensus-based switched observers developed in a previous work are used. In particular, on the basis of the observability properties of the considered freeway system, which is modeled as a piecewise-affine state-dependent system, a switched ramp metering controller based on a distributed observer is proposed. According to the present mode of the freeway system, the local controller of each on-ramp switches between a feedback controller based on the downstream density, a feedforward controller based on the upstream density and a pre-computed control law.
In this paper, a multi-class and multi-objective combined ramp metering and routing control strat... more In this paper, a multi-class and multi-objective combined ramp metering and routing control strategy is proposed to improve performance in freeway traffic networks. The control strategy is of the multi-class type, i.e. different classes of vehicles are taken into account, so that specific control policies can be devised for each class. Moreover, ramp metering and route guidance are properly coordinated in order to reduce the total travel time and the total emissions in the freeway system in a balanced way. The controller proposed in the paper is of the predictive feedback type, i.e. the control computed at each time step depends on the measured system state and on the prediction of the system evolution, considering both a traffic and an emission model. Some simulation results are presented in the paper showing the effectiveness of the proposed control scheme.
Proceedings of the 2004 American Control Conference, Aug 2, 2004
The objective of this paper is the design of a stabilizing switching control scheme for a class o... more The objective of this paper is the design of a stabilizing switching control scheme for a class of nonlinear systems. Such systems are relevant to nonlinear plants represented by means of a finite set of nonlinear discrete-time models. A finite set of receding-horizon control laws is defined for each of the nonlinear discrete-time models representing the plant. A rigorous stability
Proceedings 2007 Ieee International Conference on Robotics and Automation, 2007
In this paper, supply chain nodes are considered, with the aim of optimizing the production of pa... more In this paper, supply chain nodes are considered, with the aim of optimizing the production of parts belonging to different classes (the case of two classes is here taken into account). The production node is modelled by a discrete-event model, being the system state, consisting of the continuous level of input and output inventories, affected by the asynchronous processes relevant
Proceedings 2000 Icra Millennium Conference Ieee International Conference on Robotics and Automation Symposia Proceedings, 2000
A. Di Febbraro, R. Minciardi, S. Sacone ... Dept. of Communications, Computer, and Systems Scien... more A. Di Febbraro, R. Minciardi, S. Sacone ... Dept. of Communications, Computer, and Systems Sciences University of Genova - Italy Phone: +39-010-353-2748; Fa: +39-010-353-2154 E-mail: (riccardo, simona)@dist. unige. it ... Dipartimento di Automatica e Informatica ...
ABSTRACT This paper deals with the classic second order Payne-Whitham macro-scopic model, commonl... more ABSTRACT This paper deals with the classic second order Payne-Whitham macro-scopic model, commonly known as PW-Model, used to represent and forecast traffic conditions in a freeway. The results of the model may show a misbehavior similar to the instability of numerical solutions of partial differential equations. Since this model comes from a partial differential equation system, we use some stability rules to determine the conditions in order to avoid these errors in simulation. The work applies to the classic model, which considers a single class of vehicles, and to the two-class extension previously presented by the authors.
... based on a linearized prediction model Simona Sacone ∗ Silvia Siri ∗ ∗ Department of Communic... more ... based on a linearized prediction model Simona Sacone ∗ Silvia Siri ∗ ∗ Department of Communications, Computer and Systems Science University of Genova e-mail: simona.sacone@ unige.it, silvia.siri@unige.it ... (1998), Di Febbraro et al. (2001), Chiang and Juang (2008). ...
Uploads
Conference papers by Simona Sacone