Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Get to the point with electric cars

26.11.2015

New process for accurate positioning to the nearest centimeter with inductive charging systems

Electric vehicles are increasingly no longer charged with electricity by cords but by means of inductive charging systems. Charging takes place via a magnetic field which is generated by a charging coil in the parking ground and transmitted to a receiver coil on the underbody of the car according to the transformer principle.


3D display of the position of the charging coil (receiver coil red, charging coil blue)

University of Stuttgart / IVK


Electric vehicle above the charging coil

University of Stuttgart / IVK

In order for this to work, the driver must park the car in a way that both coils are exactly on top of each other. Without an adequate assistance system this is virtually impossible - but precisely this kind of system has been lacking until recently.

At the Institute for Internal Combustion Engines and Automotive Engineering (IVK) at Stuttgart University a method has now been developed that accomplishes positioning accurate to the nearest centimeter.

The advantage of inductive charging systems is that in the car no charging cord must be carried, and in addition they are more secure against vandalism. However, in spite of several years of research and various technological approaches the search for a positioning method which enables precise localization of the charging coil and thus assists the driver in aligning the vehicle has not brought any satisfactory solutions so far. Either the procedures were inaccurate, immature and expensive, or very susceptible to weather conditions.

Within the scope of his doctoral thesis at IVK headed by Prof. Hans-Christian Reuss, Dean Martinovic has now developed and patented a new method based on magnetic fields with which a vehicle can be placed so precisely that the position of the two coils differs by less than one centimeter.

In the project "BIPoLplus“ that is funded by the Federal Ministry of Education and Research (BMBF) as well as supported by the Research Institute of Automotive Engineering and Vehicle Engines Stuttgart (FKFS) within the framework of the leading-edge cluster "Electromobility South-West", he uses a pulsed magnetic field of low frequency for the first time instead of the usual sinusoidal magnetic field.

This way, interfering interactions with the metallic underbody of the electric vehicle can be avoided. Special highly sensitive magnetic field sensors attached directly to the metal underbody of the electric vehicle scan the magnetic pulse signal and send the information to a control unit in the vehicle.

A specifically developed algorithm then calculates automatically - without any communication with the signal-emitting electronics on the parking site - the position of the charging coil. Finally, this position is being displayed to the driver using a 3D application on a tablet in the cockpit supporting the driver in the precise alignment of the vehicle.

Thereby, the driver can trace his/her motion in real time. The current prototype uses two magnetic field sensors which indicate the position reliably as soon as the two coils approach each other to a distance of 1.5 meters. Compared to other physical quantities the magnetic field disposes of significant advantages: for example it is not subject to attenuation during the penetration of materials and as opposed to electromagnetic waves (WLAN, RFID, etc.) it is not reflected.

Since there is no line of sight required between the sensor and signal source, it is - unlike optical systems - independent of weather conditions such as snow or fog. Therefore, the approach is suitable both for use in the garage at home as well as outdoors. The method works for each vehicle and moreover it is cost-effective because, unlike other solutions, only two very small, space-saving and low-cost magnetic field sensors are used. Whether the cars are being parked forwards or backwards and whether they stand side by side or one behind the other during refueling, it does not matter: all parking models are being supported by this method.

In the future the system will become even better: more projects at IVK aim at increasing the positioning range and at optimizing the signal processing.

Andrea Mayer-Grenu | idw - Informationsdienst Wissenschaft
Further information:
http://www.uni-stuttgart.de/

More articles from Power and Electrical Engineering:

nachricht Researchers use light to remotely control curvature of plastics
23.03.2017 | North Carolina State University

nachricht TU Graz researchers show that enzyme function inhibits battery ageing
21.03.2017 | Technische Universität Graz

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Argon is not the 'dope' for metallic hydrogen

24.03.2017 | Materials Sciences

Astronomers find unexpected, dust-obscured star formation in distant galaxy

24.03.2017 | Physics and Astronomy

Gravitational wave kicks monster black hole out of galactic core

24.03.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>