Intelligent Speed Adaptation in vehicles Date: 01/08/09 Tamil Eniyan. M 08MEA026 M.Tech-Automotive Electronics Review - 0
Contents Introduction –Existing speed adaptation techniques –Need System Overview –Block diagram –Steps Time plan Software tools Hardware modules Conclusion
Introduction The Intelligent Speed Adaptation is done in vehicle using GPS technology by tracking the location of the vehicle This system does not require a preloaded map or route for its operation This system is a low cost and effective system which requires less memory and simple algorithm.
Existing speed adaptation techniques RF id based systems –This system uses RF id tags on the sign boards, the receiver module in the vehicle receives the signal at various speed zones through these RF tags. This systems can be employed only for slow vehicles. Practically it cannot be employed in the highway for vehicles with high speed like 100kmph Optical recognition systems –This is done by camera based detection, the camera records continuously, when a sign boar is approached, the sign is recognized by image processing techniques. This system uses complex algorithm Uses much resources Some critical cases when the sign board is covered by tree branches, the system does not detect the sign board.
GPS based systems –The GPS receiver module tracks its position and using the pre loaded map and speed zone database, the speed adaptation is done Requires a large memory to store the complete map and speed zone databases. Emergency sign boards like “MEN AT WORK”, “TAKE DIVERSION” etc. are not fed to the receiver dynamically. Dead reckoning –Using sensors, it can plot the path taken by the vehicle. By overlaying this path onto a digital map, the DR system knows approximately where the vehicle is, what the local speed limit etc. This system is much complicated with multiple sensors and possibility of deviation from actual data is high Existing speed adaptation techniques
Need for a new system To over come the limitations of the other Speed adaptation systems. To reduce the memory requirement of conventional GPS speed adaptation techniques. To reduce the system cost and enhance the system performance to provide dynamic update of information.
Block Diagram GPS Receiver RF Receiver Controller Memory Display & Alert Speed controller RF Tx My position? lat= lon= TOLLGATE
Step 1 Transmitter sends a data to the vehicle. The data is a table of information of latitude and longitude and its corresponding road sign, speed limit..
Step 2 GPS receiver requests its position data to satellite.
Step 3 GPS receiver receives its position data from satellite. lat= long=
0001| | lat= long= Current Position From GPS A sample data from received data. YES Step 4 The current position is compared with the data of table received. When the current position reaches the position of data, corresponding alert is done. Check for the corresponding sign & speed limit Alert the driver / Limit speed =?=?
Time plan August Literature survey September Selection of components/ Study about components selected (microcontroller, GPS, Speed control) October November Basic hardware design December Full Hardware Implementation (Speed Zone Detection & Alert) January Programming February Stage II development (speed control implementation) March Project Completion April Report Preparation
Software Tools Microcontroller Programming tools –Keil IDE –MPLAB IDE Flashing tool
Hardware modules GPS Receiver Microcontrollers Wireless Transmitter / Receiver Computer Interface Display unit Speed Control Module
Reference N. Agerholm,R, Waagepetersen,N. Tradisauskas,and H. Lahrmann IEEE Intelligent Vehicles Symposium “Intelligent Speed Adaptation in Company Vehicles” Riaz Sayed, Pierre Delaigue, Jeremy Blum, Ali Mortazavi and Azim Eskandarian SAE TECHNICAL PAPER SERIES “Development of an Intelligent Multimode Speed Adaptation System” European Road Safety Observatory “Intelligent Speed Adaptation (ISA)” University of Leeds and MIRA Ltd. “Intelligent Speed Adaptation Literature Review and scoping study”- January
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