| 1. |
- Berger, Christian, 1980, et al.
(författare)
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Simulations on consumer tests: A systematic evaluation approach in an industrial case study
- 2014
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Ingår i: 2014 17th IEEE International Conference on Intelligent Transportation Systems, ITSC 2014. - : IEEE. - 9781479960781
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Konferensbidrag (refereegranskat)abstract
- Context: Consumer tests for vehicles have long a tradition of almost two decades in Europe to assess vehicular safety abilities. For active safety systems like an emergency braking guard, different consumer-test-organizations (CTOs) around the world intensify now the challenges for automotive Original Equipment Manufacturer (OEM) in terms of specific test protocols.
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| 2. |
- Fadaei, Masoud, et al.
(författare)
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Real-Time Bus Departure Time Predictions: Vehicle Trajectory and Countdown Display Analysis
- 2014
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Ingår i: 2014 IEEE 17th International Conference on Intelligent Transportation Systems (ITSC). - : IEEE conference proceedings. - 9781479960781 ; , s. 2556-2561
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Konferensbidrag (refereegranskat)abstract
- Uncertainty is an important challenge in operating bus systems. Accurate real-time predictions can therefore facilitate adaptive decision making process of both operations and passengers. This scheme should be tractable, fast and reliable to be used in real time applications. This paper presents a hybrid prediction scheme to generate real-time information concerning downstream vehicle trajectories and next bus arrival. The prediction generated by the proposed hybrid scheme integrates three travel time components: schedule, instantaneous and historical data. Genetic algorithm is applied in order to specify the contribution of each data source component to the prediction scheme. The benefits, transferability and estimation form of the proposed scheme were tested by applying it on three trunk bus lines in Stockholm, Sweden. Its performance was compared to a commonly deployed scheme. The results indicate that the proposed scheme reduces significantly the overall mean absolute error for all routes from both operators' and passengers' perspectives.
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| 3. |
- Fatemi, Maryam, 1982, et al.
(författare)
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Road Geometry Estimation Using a Precise Clothoid Road Model and Observations of Moving Vehicles
- 2014
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Ingår i: 17th International IEEE Conference on Intelligent Transportation Systems October 8-11, 2014, Qingdao, China. - 9781479960781 ; , s. 238-244
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Konferensbidrag (refereegranskat)abstract
- An important part of any advanced driver assistancesystem is road geometry estimation. In this paper, wedevelop a Bayesian estimation algorithm using lane markingmeasurements received from a camera and measurements of theleading vehicles received from a radar-camera fusion system, to estimate the road up to 200 meters ahead in highway scenarios. The filtering algorithm uses a segmented clothoid-based road model. In order to use the heading of leading vehicles we need to detect if each vehicle is keeping lane or changing lane. Hence, we propose to jointly detect the motion state of the leading vehicles and estimate the road geometry using a multiple model filter. Finally the proposed algorithm is compared to an existingmethod using real data collected from highways. The resultsindicate that it provides a more accurate road estimation insome scenarios.
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| 4. |
- Jin, Junchen, et al.
(författare)
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Implementation and Optimization of Group-based Signal Control in Traffic Simulation
- 2014
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Ingår i: 2014 IEEE 17TH INTERNATIONAL CONFERENCE ON INTELLIGENT TRANSPORTATION SYSTEMS (ITSC). - 9781479960781 ; , s. 2517-2522
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Konferensbidrag (refereegranskat)abstract
- Over the past decades, group-based control has become one of the most popular signal technologies being applied in many cities around the world. LHOVRA control is one of such group-based controls widely employed in Scandinavian countries. While several previous studies showed that group-based control outperforms stage-based control in many aspects, implementation and evaluation of signal controllers are complicated in a real application. In addition, little effort has been put in optimizing such group-based controllers in traffic management practice. This study implements generic group-based control in an object-oriented software framework, while a software-in-the-loop simulation is developed to integrate the signal controller with an open-source traffic simulator, SUMO. Also, stochastic optimization is applied to generate optimal signal parameters according to different settings of objective. In particular, part of the study is to improve the computational performance of the optimization process by parallelized simulation runs. Test-based experiments are finally carried out to evaluate traffic and optimize its impact on a small traffic network in Stockholm.
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| 5. |
- Kianfar, Roozbeh, 1984, et al.
(författare)
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Combined Longitudinal and Lateral Control Design for String Stable Vehicle Platooning within a Designated Lane
- 2014
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Ingår i: 17th International IEEE Conference on Intelligent Transportation Systems. - 9781479960781 ; , s. 1003-1008
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Konferensbidrag (refereegranskat)abstract
- We propose a combined longitudinal and lateral control approach for vehicle platooning within a designated lane. We combine linear frequency and time domain methods, to design longitudinal control that ensures string stability while enforcing safety, comfort and actuator limitations. In addition, we design lateral control that accounts for speed variations induced by the longitudinal control as well as safety, comfort and actuator limitations using convex optimization methods.
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| 6. |
- Morales, Oscar, 1972, et al.
(författare)
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Cooperation with disagreement correction in the presence of communication failures
- 2014
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Ingår i: 2014 17th IEEE International Conference on Intelligent Transportation Systems, ITSC 2014. - 9781479960781 ; , s. 1105-1110
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Konferensbidrag (refereegranskat)abstract
- Vehicle-to-vehicle communication is a fundamental requirement in cooperative vehicular systems to achieve high performance while keeping high safety standards. Vehicles periodically exchange critical information with nearby vehicles to determine their maneuvers according to the information quality and established strategies. However, wireless communication is prone to failures. Thus, participants can be unaware that other participants have not received the information on time resulting in conflicting trajectories that may not be safe. We present a deterministic solution that allows all participants to use a default strategy when other participants have not received on time the complete information. We base our solution on a timed distributed protocol that adapts its output according to the effect of message omission failures so that the disagreement period occurs for no longer than a constant time (of the order of milliseconds) that only depends on the message delay. We formally show the correctness and perform experiments to corroborate its efficiency. We explain how the proposed solution can be used on vehicular platooning to attain high performance and still guarantee high safety standards despite communication failures. We believe that this work can facilitate the implementation of cooperative driving systems that have to deal with inherent (communication) uncertainties.
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| 7. |
- Rodrigues de Campos, Gabriel, 1986, et al.
(författare)
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Collision avoidance at intersections: A probabilistic threat-assessment and decision-making system for safety interventions
- 2014
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Ingår i: 2014 17th IEEE International Conference on Intelligent Transportation Systems, ITSC 2014; Qingdao; China; 8 October 2014 through 11 October 2014. - 9781479960781 ; , s. 649-654
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Konferensbidrag (refereegranskat)abstract
- Road intersections are among the most complex and accident-prone elements of modern traffic networks. Thus, newsafety systems have to copewith highly complex traffic scenarios where the behavior of the different roadusers is difficult to predict. Sensing the surrounding environment and assessing possible threats therefore remain challenging problems. This paper provides a novel, efficient active-safety system for frontal collisions detection and prevention/mitigation. More precisely, we provide: (i) a probabilistic motion prediction algorithm based on an unscented Kalman filter; (ii) a probabilistic threat assessment method based on vectors defined by reference points on the vehicles' structure; (iii) a reachability-based decision-making protocol enabling an emergency intervention. Simulation results, based on realistic data obtained specifically for this scenario, are also presented showing the efficiency and the potential of the proposed solution.
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| 8. |
- Uhlén, Karin, 1990, et al.
(författare)
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Coordination of Actuators for an A-double Heavy Vehicle Combination
- 2014
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Ingår i: 17th International IEEE Conference on Intelligent Transportation Systems.. - 9781479960781
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Konferensbidrag (refereegranskat)abstract
- This paper shows how actuator coordination,based on control allocation, can be used in the motion control system for long articulated heavy vehicles. Usage of a control allocation structure is one way to handle an over-actuated system, which is a system where there are more motion actuators than controlled motions. The A-double combination is in focus for the control allocation design, which is based on vehicle modelling using the Lagrange formulation. The control structure is tested in a simulation environment and evaluated by two test scenarios. For the selected configuration with 31actuators, the control allocation method coordinates the desired motion for both large and small steer and articulation angles. The proposed control structure is shown to be convenient when the vehicle configuration, for example the number of actuators in the combination, is changed.
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