Review - 0 Intelligent Speed Adaptation in vehicles Date: 01/08/09 Tamil Eniyan. M 08MEA026 M.Tech-Automotive Electronics
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.
Existing speed adaptation techniques • 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
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 lat=12.970649 lon=79.159310 Speed controller 4 3 GPS Receiver My position? Controller 2 Memory RF Receiver 1 RF Tx Display & Alert 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=12.970649 long=79.159310
lat=12.970649 long=79.159310 0001|76.11004|12.19256 =? A sample data from received data. Current Position From GPS 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
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 2008 - IEEE Intelligent Vehicles Symposium“Intelligent Speed Adaptation in Company Vehicles” • Riaz Sayed, Pierre Delaigue, Jeremy Blum, Ali Mortazavi and Azim Eskandarian 2007-01-1321 SAE TECHNICAL PAPER SERIES “Development of an Intelligent Multimode Speed Adaptation System” • European Road Safety Observatory “Intelligent Speed Adaptation (ISA)”http://www.erso.eu/knowledge/content/04_esave/ • University of Leeds and MIRA Ltd. “Intelligent Speed Adaptation Literature Review and scoping study”- January 2006 http://www.tfl.gov.uk/assets/