AUTO CONTROL OF VEHICLE SPEED

Abstract

This project is designed for Electric vehicles and is aimed to reduce the speed automatically when the
system detects that the vehicle is running at high speed. Running vehicle is simulated with DC motor and its
speed will be controlled using variable voltage regulator IC. The main objective of this project is to avoid
accidents occur due to the over speed running vehicles.
To prove the project practically, the prototype module is constructed with 100RPM DC motor and its speed is
varied using LM317, this is a variable regulator IC. This circuit designed with Hall effect sensor can generate
digital pulse for every revolution of the disc attached to the motor shaft.
In this project number of revolutions in the form of digital pulses is counted in stipulated time and estimated the
speed.
Here exact speed is not displayed, if the motor is running at its normal speed, the LCD interfaced with main
processing unit built with controller displays Normal speed, if the speed is increased to its maximum level, than
the display shows Over speed.
When the motor is running at high speed, the controller chip energizes the relay and this relay contact is used to
reduce the speed automatically through current limiting resistor by which the motor speed will be reduced and
will be stopped automatically indicating the breaks applied. Alarm is also used to alert the driver during over
speed running condition.