Adaptive Cruise Control
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 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
References: * IEEE transactions on intelligent transportation systems, vol. 7, no. 2, June 2006. * Proceedings of the 2008 IEEE International Conference on Robotics and Biomimetics Bangkok, Thailand, February 21 - 26, 2009. * University of Michigan (July 12, 2004). U-M physicist: Smart cruise control eliminates traffic jams. Press release. * L. C. Davis (2004). "Effect of adaptive cruise control systems on traffic flow". Physical Review Letters E 69 (6). * CY Liang, H Peng (1999). "Optimal Adaptive Cruise Control with Guaranteed String Stability". Vehicle System Dynamics . * P Venhovens, K Naab, B Adiprasito (2000). "Stop and Go Cruise Control". Proc. FISITA World Automotive Congress, Seoul, Korea. * www.pcmag.com/encyclopedia * www.wikipedia.org * www.howstuffworks.com * www.google.com