Topics: Fuzzy logic, Cruise control, Fuzzy control system Pages: 12 (3220 words) Published: October 23, 2012
ABSTRACT

Cruise control system is developed for highway driving. This system is useful for driving in roads which are big, straight, and the destination is far apart. When traffic congestion is increasing, the conventional cruise control becomes less useful. The adaptive cruise control (ACC) system is developed to cope up with this situation. The conventional cruise control provides a vehicle with one mode of control, velocity control. On the other hand, ACC provides two modes of control, velocity and distance control. Unlike the cruise control, however, ACC can automatically adjust velocity in order to maintain a proper distance between obstacle and the vehicle equipped with ACC. This is achieved by using laser or radar to measure the relative distance between the host vehicle and a vehicle in front. ACC extensions with the Stop&Go capability can be said to be a typical maneuver in city streets, where, for instance, speed is reduced to stop the car at a red traffic light. Both throttle and brake pedal automation is needed to install this feature in a vehicle. Fuzzy logic is used to generate the control signals.

CONTENTS

1. INTRODUCTION 4 2. ADAPTIVE CRUISE CONTROL 5 3. COMPONENTS OF AN ACC SYSTEM 7 4.1 SENSORS 7 3.2 MAN MACHINE INTERFACE 8 3.3 FUZZY LOGIC CONTROL 10 3.4 ELECTRONIC ACTUATORS 14 3.5 MICROCONTROLLER 15 4. BASIC BLOCK DIAGRAM 16 5. WORKING 17 6. RELEVANCE OF ADAPTIVE CRUISE CONTROL 22

7. ADVANTAGES 23 8. LIMITATIONS 24 9. APPLICATIONS 25 10. FUTURE 26 11. CONCLUSION 27 12. REFERENCES 28 13.

1. INTRODUCTION

Mentally, driving is a highly demanding activity - a driver must maintain a high level of concentration for long periods and be ready to react within a split second to changing situations. In particular, drivers must constantly assess the distance and relative speed of vehicles in front and adjust their own speed accordingly. Those tasks can now be performed by Adaptive Cruise Control (ACC) system, which is an extension of the conventional cruise control system. Like a conventional cruise control system, ACC keeps the vehicle at a set constant speed. The significant difference, however, is that if a car with ACC is confronted with a slower moving vehicle ahead, it is automatically slowed down and then follows the slower vehicle at a set distance. Once the road ahead is clear again, the ACC accelerates the car back to the previous set cruising speed. In that way, ACC integrates a vehicle harmoniously into the traffic flow.

Adaptive cruise control uses forward-looking radar, installed behind the grill of a vehicle, to detect the speed and distance of the vehicle ahead of it. Adaptive cruise control is similar to conventional cruise control in that it maintains the vehicle's pre-set speed. However, unlike conventional cruise control, this new system can...