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
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
A big nano boost for solar cells
18.01.2017 | Kyoto University and Osaka Gas effort doubles current efficiencies
Multiregional brain on a chip
16.01.2017 | Harvard John A. Paulson School of Engineering and Applied Sciences
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
19.01.2017 | Earth Sciences
19.01.2017 | Life Sciences
19.01.2017 | Physics and Astronomy