1,721,094 research outputs found
Experimental activities on TTCAN protocol
No full textThe automotive market is more and more interested in all-electric systems for the execution of the driving commands, i.e. in the so-called Drive-by-Wire (DbW) systems. The communication network of a DbW system is a critical component and, being the traditional field buses used in the cars not suited to highly dependable applications, new communication networks have been devised, built up around protocols that accommodate powerful techniques to assure the real-time exchange of information and some degree of redundancy. This paper illustrates the characteristics of the TTCAN protocol, one of the communication networks developed for DbW systems. It reports the results of a number of test carried out on a prototypal network with the aim of investigate the behavior of the protocol when it operates in nominal condition and when it is forced beyond the specification limit. Moreover, a technique for the synchronization of two or more TTCAN network has been experimente
Reti neurali: Aspetti teorici ed applicazioni al controllo di un azionamento elettrico in corrente continua
No full textCommunication networks for drive-by-wire applications
No full textThe automotive market is more and more interested in all-electric systems for the execution of the driving commands, i.e. in the so-called Drive-by-Wire (DbW) systems. The most crucial issue in their usage is the achievement of acceptable levels of dependability. From this point of view, the communication network of a DbW system is a critical component. Being the traditional fieldbuses used in the cars not suited to highly dependable applications, new communication networks have been devised, built up around protocols that accommodate powerful techniques to assure the dependability in the data exchange. This paper illustrates the characteristics of the communication networks for DbW systems, focusing on the techniques adopted to stand up against errors and faults of communicatio
DSP implementation of a Direct Torque Control Induction Motor Drive
No full textThe paper presents a Direct Torque Control (DTC) scheme for an Induction Motor (IM) drive that makes use of only one current sensor inserted in the inverter dc link and of an ad-hoc algorithm to reconstruct the stator currents. DSP implementation of the control system of the novel DTC scheme is illustrated. Experimental traces obtained from the resultant IM drive are shown. They demonstrate that the drive exhibits the excellent performance of a conventional DTC drive although it has the same hardware as a V/f drive
Design of DWC System Track with Unequal DD Coil Set
No full textDynamic wireless charging powers electric vehicles
(EVs) even when they are moving on the road. In recent
years, the track arrangement of lumped type has been investigated
and the double-D (DD) shape has been found as the
most appropriate for the track and pickup coil set. This paper
investigates an unequal DD (UDD) configuration for the coil
set that offers better continuity in powering EVs during their
motion and reduces the cost of track deployment. The coupling
properties of the UDD coil set have been examined with the
help of the JMAG-Designer tool and experimentally verified
on a small-scale prototype. Then a design procedure of the
track is elaborated, intended to establish the dimensions and
distance of the track coils as a function of the power and voltage
specifications of the dc–dc converter connected to the EV dc link.
Finally, a design example is reported and the charging capabilities
of the resulting track are explored with the help of the PSIM
simulation tool
Experimental Analysis of a Time-Triggered Network Designed for Train Communications
No full textTime-triggered protocols are recognized to have a high degree of dependability. The purpose of this paper is to analyze by experiments their application to the networking of the devices installed aboard train. The paper starts by reviewing the current standard for the train communications. Then the operating principles of the time-triggered protocols are illustrated, a possible arrangement for a time-triggered network to be applied to a train is presented, and the TTP/C protocol is introduced. Afterwards the technical data of a commercial TTP/C board are illustrated and a prototypal network is set up with these boards to control an emulated train function. At last, experimental results showing the communication characteristics of the prototypal network are reporte
Identificazione dell'induttanza di magnetizzazione di un motore asincrono saturo in sede di taratura automatica
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