The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A hydrogen generation system for fuel cell hybrid electric vehicles (FCHEVs) which generates large amount of hydrogen rapidly by hydrolysis of powdery sodium tetrahydrob-orate (NaBH4) has been proposed and developed. The system has some problems; one of the problems is difficulty of controlling the supply amount of the hydrogen which is generated by the system to a fuel cell (FC) stack. This problem...
The wireless access in vehicular environments (WAVE) architecture and services necessary for WAVE devices to communicate in a mobile vehicular environment are described in this guide. It is meant to be used in conjunction with the family of IEEE 1609 standards as of its publication date. These include IEEE Std 1609.2, IEEE Standard Security Services for Applications and Management Messages, IEEE Std...
In 2010 over fifty advanced vehicle prototypes competed in the $10M Progressive Insurance Automotive X PRIZE competition for 100 MPGe vehicles. Battery electric, hybrid, plug-in hybrid and traditional ICE vehicles were all represented. The competing vehicles were rigorously tested for fuel economy, range, emissions, and other performance characteristics. This paper presents selected data with a view...
In this paper, we discuss the problem of the road vehicles detection based on video sequence images. In order to eliminate the effects of vehicle's self-shadow in nature lights, we present a novel method which combines the region-based algorithm with the pixel-based algorithm, based on multi-feature fusion to get rid of shadow regions. The dissertation demonstrates the advantages of the proposed algorithm...
This paper presents the development of an obstacle mapping system based on the concept of a Probabilistic Threat Exposure Map (PTEM). The paper also discusses the realtime embedded implementation of this obstacle mapping system on a small Unmanned Ground Vehicle (UGV) to support realtime obstacle avoidance. These activities are a part of a larger effort to establish a theoretical foundation for autonomous...
A simplified model (mono-track vehicle) of ADT is built and a fuzzy dynamic sliding mode control method is used for tracking of the ADT during slippage of its wheels without braking. By regulating the switching surface parameters with fuzzy logic method in real time, the proposed controller can track a reference input wheel slip in a short time. A simulation model generated by MATLAB/Simulink is used...
Recently, attentions are focused more on bus interior network application and the wireless bus-carry data transmission technology. For developing a remote monitoring system, three aspects of the system are discussed: the vehicle interior network configuration, the CAN/GPRS gateway realization and the remote monitoring server design. Described in the paper are the hardware and software design of the...
This paper is to design an autonomous cruise control module for autonomous vehicle following to maintain steering smoothness and a desired intervehicle spacing from highway to nonhighway environments. We reasonably simplify the nonlinear kinematical module to linear time-varying module by combining optimal control on lateral side with classic correction control on longitudinal side. Computer simulations...
This paper propose a method for automatic vehicle detection in QuickBird images of small highways, with relatively low traffic density, frequent occurrence of tree shadows, and changes in illumination conditions. The vehicle detection is based on an elliptical Laplacian of Gaussian scale space methodology, where the vehicle locations are detected at local extrema in the image response to convolution...
Freeway traffic state estimation is one of the central components in real-time traffic management and information applications. Recent studies show that the classic kinematic wave model can be formulated and solved more efficiently and accurately in Lagrangian (vehicle number-time) coordinates. This paper investigates the opportunities of the Lagrangian form for state estimation. The main advantage...
It is a key segment of the traffic management system about detecting traffic parameters. With the continuous development of computer vision, the video traffic detection method is paid more and more attention. It is constructed that an Epi-polar Plane Image (EPI) method reflect the surface and movement characteristics of the vehicle, then the EPI is processing of normalization, filtering and texture...
Electronic Stability Control (ESC) is one of the most effective methods of controlling the Yaw moment in vehicles. This method is based on unequal distribution of tire forces (mainly braking forces) and is particularly effective when tire behavior is in nonlinear zone and loses its sensitivity to the steering input. While different approaches for evaluating the adequate Yaw moment have been developed,...
In this paper, an integrated vehicle dynamic control system of AFS/SAS is proposed to improve vehicle handling and ride performance. The SMC methodology which is deduced form the linear 2DOF vehicle model is used to design the AFS subsystem controller. Fuzzy logic control strategy is presented to control the integrated system. The simulation results show that the integrated control system can obviously...
According to the travel time estimation problems in the urban road traffic flow, two travel time estimation models are presented in this paper. The velocity model is based on the average velocity of vehicles at the adjacent monitoring points, and the retention time model is based on the free driving time and the residence time used in road between two adjacent monitoring points. The models are validated...
It has the great significance to recognition road type based on vehicle load. In this paper, it is proposed that Self-Organizing feature Map (SOM) network is used to determine sample IDentity (ID) and Support Vector Machine (SVM) is employed to recognize road types based on vehicle load. Experiment results indicate that the improved Particle Swarm Optimization (PSO) algorithm gives best performance...
This paper has proposed an application of 2D principal component analysis (2DPCA) and genetic algorithm (GA) for vehicle detection from CCTV captured image. The system deploys a 2DPCA algorithm for feature extraction of vehicle within gray scale images. These vehicle feature matrices of size 50×20 are trained and then classified by using genetic algorithm. This system can detect different vehicle...
Vehicle license plate identification system is an image-processing technology used to identify vehicles by their license plates. This technology is used in various security and traffic applications. This data is also used for enforcement, data collection, and can be used to keep a time record on the entry or exit of vehicles for automatic payment calculations. The significant advantage of this system...
In this paper, we introduce a mathematical approach for modeling the bus priority system. The main objective is to highlight the problem of the bus priority dilemma. The mathematical approach is based on Petri Nets with inhibitor arc. Based on dioid algebra, we add a new constraint that models the resource sharing problem with a priority user. The system behavior is described by Minax[[γ,δ]]-linear...
To address the local path planning problem for autonomous land vehicle in unstructured environments, a novel method combining navigation function and A* search is proposed. The computed navigation function in this paper embodies different constraints of vehicle, so in fact to be a near-feasible trajectory. Next the navigation function and sensed obstacles is used to construct the heuristic function,...
Er Lang Shan tunnel is the most absolute altitude highway tunnel in china, which was firstly used the semi-transverse ventilation system, is characteristic of extensive length, higher absolute altitude, multivariate climate and complex wind stream. Based on one-dimensional fluid mathematic models, the characteristics of distribution of wind field were simulated under diversity conditions such as fans,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.