Implementation of Microcontroller Based Vehicle Speed Control System Using Ultrasonic Range Finder

Abstract

In vehicle driving, speed control is vital because of whether fast or slow driving may be collision, accidences, delay and jam the traffic. These types of cases can be reduced or eliminated from the driving by using electronic control technology. In this paper ultrasonic range finder detects the distance between the vehicle and the obstacle during driving and speed control is depending on this detected distance. Pulse Width Modulation (PWM) controls the voltage of the motor. The duty cycle value (PWM) is calculated by fuzzy logic control system based on detected distance and current (PWM) duty value. The process of detection distance and PWM output are controlled by Microcontroller (PIC18F452). The detected distance is less then 50 CM the vehicle will stop. The vehicle can go only forward direction. The control strategy is implemented by using MikroC language.