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ADAPTIVE CRUISE CONTROLADAPTIVE CRUISE CONTROL
ASWATHY.SASWATHY.S Roll No :14Roll No :14
OUTLINEOUTLINE
INTRODUCTIONINTRODUCTION WHAT IS ACC?WHAT IS ACC? MODES OF OPERATIONMODES OF OPERATION WORKINGWORKING PHYSICAL LAYOUT OF THE SYSTEMPHYSICAL LAYOUT OF THE SYSTEM APPLICATIONSAPPLICATIONS CONCLUSIONCONCLUSION REFERENCEREFERENCE
INTRODUCTIONINTRODUCTION Adaptive Cruise Control (ACC) adapts the vehicle's speed Adaptive Cruise Control (ACC) adapts the vehicle's speed
to the to the traffic environment. traffic environment. Radar system attached to the front of the vehicle Radar system attached to the front of the vehicle is used to detect slower moving vehicles that are in the ACC is used to detect slower moving vehicles that are in the ACC
vehicle's path. vehicle's path. The system allows the ACC vehicle to autonomouslyThe system allows the ACC vehicle to autonomouslyslow down and speed up with traffic without intervention slow down and speed up with traffic without intervention
from the from the driver. driver. The method by which the ACC vehicle's speed is The method by which the ACC vehicle's speed is
controlled is controlled is via engine throttle control and limited brake operation.via engine throttle control and limited brake operation. Accidents can be reduced up to a great extent.Accidents can be reduced up to a great extent.
• 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
Adaptive Cruise ControlAdaptive Cruise Control Change gear automaticallyChange gear automatically Function properly in poor weather conditionFunction properly in poor weather condition The radar range is 120-150mtsThe radar range is 120-150mts Effective in the speed between 30km-180km/hEffective in the speed between 30km-180km/h
CLEARANCE : distance from the forward vehicle’s trailing surface to the ACC vehicle’s leading surface.
TIME GAP :the time interval between the ACC vehicle and the target vehicle.
BASIC EQUATIONBASIC EQUATION
SYSTEM STATESSYSTEM STATES ACC OFF STATE : direct access to the ‘ACC active’ state ACC OFF STATE : direct access to the ‘ACC active’ state
is disabled.is disabled. ACC STANDBY STATE : system is ready for activation by ACC STANDBY STATE : system is ready for activation by
the driver.the driver. ACC ACTIVE STATE : the ACC system is in the active ACC ACTIVE STATE : the ACC system is in the active
control of the vehicle while under ACC control. control of the vehicle while under ACC control.
TWO MODES OF OPERATIONTWO MODES OF OPERATION
ACC SPEED ACC SPEED CONTROL MODECONTROL MODE
During this mode there is During this mode there is no vehicle present within no vehicle present within the time gap or clearance the time gap or clearance of the system.of the system.
Set speed is maintained.Set speed is maintained. The engine control The engine control
system controls the system controls the engine output via throttle engine output via throttle control to maintain the control to maintain the vehicle speed at the vehicle speed at the target speed target speed
ACC TIME GAP ACC TIME GAP CONTROL MODECONTROL MODE
The ACC system enter The ACC system enter into this mode if the radar into this mode if the radar detects a forward vehicle detects a forward vehicle at or within the clearance at or within the clearance distance.distance.
Set distance is maintainedSet distance is maintained The ACC system sends a The ACC system sends a
target speed to the Engine target speed to the Engine Control Module and Control Module and deceleration commands to deceleration commands to the Brake Control Module.the Brake Control Module.
HOW ACC WORKS?HOW ACC WORKS?
Radar-based Adaptive Cruise Radar-based Adaptive Cruise ControlControl
APPLICATIONSAPPLICATIONS
COLLISION WARNINGCOLLISION WARNING PARKING ASSISTANCEPARKING ASSISTANCE LANE ASSISTANCELANE ASSISTANCE
COLLISION WARNINGCOLLISION WARNING
Warning issued at different levels
Accidents avoided due to the use of radar and image analysis
Give assistance while taking curved paths
Details of the forward vehicle obtained via Inter-Vehicle Communication System
Self-parking systems have different ways of sensing the objects around the car.
The sensors transmit signals to detect objects.
The car thus detects the other parked cars, the size of the parking space and the distance to the curb, then steers it into the space.
PARKING ASSISTANCE
Screen mounted on the dashboard gives the driver notifications such whento stop, when to shift into reverse, and when to slowly ease off the braketo move the car into the parking spot
LANE ASSISTANCE
Gives warning when the vehicle moves out of lane
<<video
CONCLUSIONCONCLUSION
Reduces the rate of accidents
Reduces driver fatigue
Increases fuel efficiency due to gradual increase and decrease in traffic speed
Cost of the system is slowly decreasing
<<VIDEO>>
REFERENCEREFERENCE Petros Ioannou; Cheng-Chih Chien. “Petros Ioannou; Cheng-Chih Chien. “Autonomous Intelligent Cruise Autonomous Intelligent Cruise
ControlControl””. IEEE Trans. On Vehicular Technology, 42(4):657-672, 1993.. IEEE Trans. On Vehicular Technology, 42(4):657-672, 1993.
Willie D. Jones, “Keeping cars from crashing.” , IEEE Spectrum September 2001.Willie D. Jones, “Keeping cars from crashing.” , IEEE Spectrum September 2001.
P.Venhovens, K. Naab and B. Adiprasto, “Stop And Go Cruise Control”, International P.Venhovens, K. Naab and B. Adiprasto, “Stop And Go Cruise Control”, International Journal of Automotive Technology, Vol.1, No.2, 2000. Journal of Automotive Technology, Vol.1, No.2, 2000.
Martin D. Adams, “Co axial range Measurement-Current trends for Mobile robotic Martin D. Adams, “Co axial range Measurement-Current trends for Mobile robotic Applications”, IEEE Sensors journal, Vol.2, no.1 Feb.2002.Applications”, IEEE Sensors journal, Vol.2, no.1 Feb.2002.
Merril I.Skolnik, “Introduction To RADAR Systems.”Tata Mc Grawhill edition 2001. Merril I.Skolnik, “Introduction To RADAR Systems.”Tata Mc Grawhill edition 2001.
http:// www.motorola .semiconductor. comhttp:// www.motorola .semiconductor. com
http://www.world.honda.comhttp://www.world.honda.com
THANK YOUTHANK YOU