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ElectronicRoad competition - A Sample Project

Project Goal

Not keeping a safe distance between vehicles is one of the main causes for road accidents. For example, when a vehicle does not keep a safe distance from a vehicle in front, a sudden stop in the front vehicle may cause an accident. The project's goal is to alert on driver in the back car when not keeping safe distance, and also to alert on sudden stop of the fron vehicle.
Comments:
  • The system should calculate the required distance L according to the relative speeds of both vehicles
  • The system will warn the driver in the back vehicle if distance from front vehicle isn't safe

Solution Description

Each car will include a system consisting of:
  • A GPS sensor
  • A wireless transmitter/receiver sensor of a 300 meters range.
  • A touch sensor on the brake
  • A controller attached to above sensors. The controller is also connected to the vehicle's speed, and it could read it at any time.
Using the GPS sensor, any vehicle knows its location. Using the wireless transmitter/receiver vehicles communicate and exchange information including:
  • vehicle location - as captured via GPS
  • vehicle speed
  • pressing the brake pedal - reported a sudden stop
Using the wireless transmitter/receiver a local information network is created, which is updated regularly and includes the above three types of information.
When car no. 2 approaches to within a few hundred meters from car no. 1, it begins to receive the transmission from car 1, and of course, car1 starts to recieve car 2's information. As car 2 receives car 1's information, the controller can calculate the distance, L, from car 1 using the GPS info. Because the two vehicles have to keep a distance of at least 1 second, the controller calculates the time difference between the two vehicles according to formula time x speed = distance:
 
t = L/v2
 
If the calculated time interval between the two vehicles, t, is less than the required - at least 1 second - the system alerts the driver. In addition, because the velocities difference, v2 - v1, is known to the controller, it can provide a severe warning if car 2 is faster than car 1, which means the interval between them decreases! Also, if car 1's driver pressed the brake pedal, the system will alert car 2's driver.

Comments:
  • GPS precision error is about 10 meters, so we can decrease this difference from L to be on the safe side of the calculation:
 
t = (L-10)/v2
 
  • Optionally, we can expand the system to prevent vehicles from entering the forbidden range in terms of keeping safe distance from a vehicle in front - in this mode the system performs prevention, which is better than a warning.
  • The system can provide early warning to other vehicles on the road. For example, if there is another vehicle - no. 3 - behind car 2, car 3's driver could receive a warning for pressing the brake pedal in car 1 (in addition to receiving information on pressing the brake pedal in car 2).