Xavier Bunlon

Extension of the “Equivalent Cable Bundle Method” for Modeling Electromagnetic Emissions of Complex Cable Bundles

This paper presents an extension of the so-called ldquoequivalent cable bundle methodrdquo for the computation over a large frequency range of the electromagnetic radiation of complex cable bundles. The purpose of the method is to reduce the complexity of the problem by grouping together the conductors according to their terminal load configuration and their excitation to reduce the required computation time for the complete cable bundle modeling. As far as the use of the method on emission problems is concerned, a new five-step procedure is established to define the electrical and geometrical characteristics of the reduced cable bundles. After the description of the adjustments required for the application of the method to emitting cases, some numerical and experimental validations performed on simple cable bundles illustrate the efficiency and the advantages of the method. The research described in this paper is considered as a new step in the study of the modeling of complex cable bundles at ldquohigh frequenciesrdquo.

An Original Approach Based on Data Exchange Between Car Manufacturers and Suppliers to Estimate Susceptibility Threshold by Numerical Simulation at Early Design Stage

This study is a result of a close partnership between a car manufacturer and an automotive component supplier. The aim is to develop electromagnetic compatibility models, i.e., immunity models to predict real-world system failure conditions that can occur inside a vehicle. For the study, we selected an interface that manages air-conditioning inside a vehicle recently put on the market. The system model is submitted by an equipment supplier as a compilation of input impedances and threshold transmitted powers causing a malfunction. The predefined model is then used by a car manufacturer on vehicle-level electromagnetic compatibility simulation, by taking into account the harness configuration and the system placement inside the vehicle cab and chassis. In this paper, we detail the complete method and demonstrate its validity.

The 'Equivalent Cable Bundle Method': an Efficient Multiconductor Reduction Technique to Model Industrial Cable Networks

In automotive electromagnetic (EM) compatibility (EMC), the cable bundle network study is of great importance. Indeed, a cable network links all the electronic equipment interfaces included the critical ones and consequently can be assimilated both to a reception antenna and to an emission antenna at the same time. On the one end, as far as immunity problem is concerned, where an EM perturbation illuminates the car, the cable network acts as a receiving antenna able to induce and propagate interference currents until the electronic equipment interfaces and potentially induce dysfunction or in the worst case destruction of the equipment. At low frequency, the interference signal propagating on the cable network is generally considered as more significant than the direct coupling between the incident field and the equipment. On the other end, as far as emission problem is concerned, the EM field emitted by the cable network may disturb itself the electronic equipments by direct coupling. To avoid these problems, automotive manufacturers have to perform normative tests before selling vehicles. These tests are applied on electronic equipments outside and inside the car first to verify that the equipments are not disturbed by an EM perturbation of given magnitude and second to ensure that the EM emission of each equipment does not exceed a limit value at a given distance. Obviously, these tests are not exhaustive and fully representative of real conditions. For example, in immunity tests, two polarizations (vertical and horizontal polarizations) of the EM perturbation are generally tested in free space conditions. In reality, the EM perturbation due for example to a mobile phone outside the car could happen from any direction of space and be reflected by all the scattering objects located in the close environment of the vehicle (ground, other vehicles, buildings,...). Consequently, the contribution of EM modelling is a great tool for automotive manufacturers in order to proceed to numerical normative, additional and also parametric tests at early stages of the car development on numerical models and for a reasonable cost. Moreover, numerical modelling will reduce the number of prototypes built during the

Study of a 5.8 GHz frequency band patch antenna integrated into a vehicle for automotive DSRC applications

This paper presents a simulation study of a 5.8 GHz patch antenna integrated into a vehicle for Dedicated Short Range Communication applications (DSRC). The DSRC deals with car-to-car and car-to-infrastructure communications and will permit to improve road transport by using information and communication technologies. This study provides simulation results validated by measurements that enable to assess the effects of car structures on radiation patterns.

A new and easy approach to create BCI models

In this article, new lumped-parameter models of current clamps are proposed and discussed. The models were extracted from measured S parameters of a clamp mounted onto a calibration fixture. The generated bulk current injection (BCI) and current probe simulation models were used in the electromagnetic (EMC) testing of a realistic cable harness according to the ISO 11452-4 standard. The accuracy and efficiency of the proposed simulation model were estimated by comparing the simulated results with measured data.

Influence of the Channel Intertap Correlation on the V2X PHY-Layer Performance

This paper focuses on the effect of intertap correlation on the orthogonal-frequency-division-multiplexing-based physical (PHY) layer of the vehicle-to-vehicle and vehicle-to-infrastructure (V2X) communication system. Theoretical analysis and simulation results based on typical V2X channel models show that intertap correlation may slightly improve the performance of the system.

Multipolar modelization of EMC emission tests setup for automotive vehicle

Electromagnetic interferences due to on board-devices may differ from what can be expected after unitary on-bench tests. This work deals with the extension to the multipolar case of a previous approach, aiming at ensuring that the on-board device performances will be satisfactory. It is based on the computation of new limits for on-bench tests obtained through a global optimization process.

Inter-vehicle communications: Study of the integration of a 5,8GHz antenna and a radio link in the 5 GHz band

An integrated patch antenna into a car structure operating in the 5.8 GHz frequency band has been studied numerically and experimentally in this paper. The results show that there is a good agreement between simulation and measurement. Then, the analysis of a vehicle to vehicle communication shows that the 5 GHz propagation is affected by multipath propagation. Our current work aims at establishing communications in the 5 GHz band and analyzing the performances of the link using the IEEE 802.11a protocol between two vehicles moving on roads.