ADAPTIVE CRUISE CONTROL www.ppttopics.com
CONTENTS INTRODUCTION PRINCIPLE OF ACC HARDWARE SENSOR OPTION SOFTWARE CO OPERATIVE ADAPTIVE CRUISE CONTROL[CACC] BENEFIT OF ACC www.ppttopics.com
INTRODUCTION Adaptive Cruise Control tries to maintain: Safe Distance when there is a leading vehicle Set Speed when there is no leading vehicle in its path www.ppttopics.com
PRINCIPLE OF ACC Acc works by detecting the distance and speed of the vehicles ahead by using either a lidar system or a radar system. The time taken by the transmission and reception is the key of the distance measurment while the shift in frequency of the reflected beam by doppler effect is measured to know the speed. According to this ,the brake and throttle controls are done to keep the vehicle the vehicle in a safe position with respect to each other. www.ppttopics.com
HARDWARE AIT Intelligent Vehicle Distance Sensor Throttle Valve Control System Automatic Braking Control System www.ppttopics.com
SENSOR OPTIONS: RADAR LIDAR VISION SENSORS ULTRASONIC SENSOR www.ppttopics.com
LIDAR(LIGHT DETECTION AND RANGING) The first acc system introduced by toyota used this method.By measuring the beat frequency differnce between a frequency modulated continuous light wave and its reflection. www.ppttopics.com
RADAR(RADIO DETECTION AND RANGING) Radar is an electromagnetic system for the detection and location of reflecting objects like air crafts,ships space crafts or vehicles. It is operated by radiating energy in to space and detecting the echo signal reflected from an object the reflected is not only indicative of the presence but on comparision with the transmitted signal,other information of the target can be obtained. The currently used ‘pulse doppler radar’ use the principle of ‘doppler effect’in determining the velocity of the target. www.ppttopics.com
FUSION SENSOR The new sensor system inrotused by fujitsu ten ltd.And honda through their path program includes millimeter wave radar linked to a 640x480 pixel stereo camera with a 40 degree viewing angle.These two parts work togther to track the car from the non moving objects. www.ppttopics.com
Automatic braking system: Cool Muscle motor installed in the Vehicle, break pedal connected with accelerator cable www.ppttopics.com
SOFTWARE Drive-by-wire throttle valve position control Adaptive Cruise Controller www.ppttopics.com
Throttle position control block diagram www.ppttopics.com
Adaptive Cruise Controller www.ppttopics.com
Are the inputs of the fuzzy controller which is implemented in a PC. For distance control The authors propose a fuzzy logic algorithm to control the host vehicle. The distance and the relative velocity between the host vehicle and the obstacle Are the inputs of the fuzzy controller which is implemented in a PC. Fuzzy controller is suitable for multi-parameters and nonlinear control problems, and the system transfer function is not required. www.ppttopics.com
NL : negative large PS : positive small NM : negative medium PM : positive medium NS : negative small PL : positive large Z : zero www.ppttopics.com
CO OPERATIVE ADAPTIVE CRUISE CONTROL Though conventional acc and sacc are still expensive novelties ,the next genration called cooperative acc is already being tested.While acc can respond to the difference between its own behavior and that of the preceding vehicle,the cacc system allows the vehicle to communicate and to work togther to avoid collision. www.ppttopics.com
BENEFIT OF ACC The driver is relieved from the task of careful acceleration,deceleration and braking in congested traffics. A highly responsive traffic system that adjusts itself to avoid accidents can be devloped. Since the breaking and acceleration are done in a systematic way ,the fuel efficiency of the vehicle is increased. www.ppttopics.com
querry? www.ppttopics.com