08-03-2011, 12:42 PM
PRESENTED BY :
U.NARESH
cruise control @2003.ppt (Size: 1.69 MB / Downloads: 277)
CRUISE CONTROL SYSTEMS
ABSTRACT
Cruise control is a new technological development which incorporates a factor of comfort in driving. Safety is only a small benefit of this system. In short, cruise control can be said to be a system which uses the principles of radar to determine the distances between two consecutive moving vehicles in which either one or both of them is incorporated with this system.
INTRODUCTION
• Every minute, on average, at least one person dies in a crash.
• Air bags and seat belts save tens of thousands of people a year.
• But the ultimate solution and the only thing that will save far more lives, limbs and money is ? till 1958.
• Cruise control was commercially introduced in 1958 as an option on the Chrysler Imperial.
WHAT IS CRUISE CONTROL?
• Cruise control is a system, which automatically controls the speed of an automobile.
• Most cruise control systems don’t allow the use of cruise control below a certain speed.
• Blind inventor and mechanical engineer Ralph teetor invented cruise control in 1945.
BASIC OPERATION
• The basic operation of a cruise controller is to sense the speed of the vehicle, compare this speed to a desired reference, and then accelerate or decelerate the car as required.
• A simple control algorithm for controlling the speed is to use a "proportional plus integral" feedback.
• The performance of the system is robust with respect to it’s mass uncertainty.
HOW TO SET CRUISE CONTROL ?
• On &off
• set/accelerate
• Resume
ADAPTIVE CRUISE CONTROL
• Adaptive Cruise Control (ACC) is an automotive feature that allows a vehicle's cruise control system to adapt the vehicle's speed to the traffic environment.
• In May 1998, Toyota became the first to introduce an ACC system on a production vehicle,luxury sedan.
• ACC systems detect the vehicle ahead through the use of either radar or lidar(light detecting and ranging).
• Lidar based ACCsystems are limited due to their poor working in bad whether.
PARTS AND WORKING
The main components of a typical radar-based ACC system are
• Fusion sensor
• Headway control unit
• Throttle
• Brake
• Dashboard display
Fusion sensor: It is a combination of sensors and processors. They are
• Millimeter-wave radar
• Stereo camera
• Image processor
• Fusion processor
• Millimeter wave radar: It is a sensor which uses millimeter wave for detecting the position and velocity of a distant object.
• Range is calculated using the formula
C = 2*R/T
Where ‘C’ is the velocity of light
‘R’ is the range
‘T’ is the time of flight of transmission.
• Stereo camera: The camera’s function is detection of cars and other objects in the roadway.
• Image processor: It processes the images from the stereo camera and the data fed into the fusion processor.
• Fusion processor: The function of fusion processor is Data Fusion.
Headway control unit: It has control on the brakes and throttle and uses dashboard for immediate warnings.
Canceling Cruise Control Operation:
• Brake pedal is pressed
• 'Off' button is pressed
• Vehicle Speed < 25 mph
• An ACC system fault is detected
DANGERS OF CRUISE CONTROL
• It’s use on wet and slippery roads may cause serious problems.
FUTURE ASPECTS
• CACC(co-operative adaptive cruise control) tested in California.
• At 100 km/hr, that would amount to a distance between cars of less than 14 meters (roughly two car lengths).
• Fujitsu Ten has demonstrated a prototype system for so called called stop-and-go adaptive cruise control.
CONCLUSIONS
• Fully autonomous car is probably not viable in the foreseen future.
• Near by vehicles would be in constant communication with each other and act co-operatively.
• It will probably take decades, but car accidents may eventually become almost as rare as plane crashes are now.
U.NARESH
cruise control @2003.ppt (Size: 1.69 MB / Downloads: 277)
CRUISE CONTROL SYSTEMS
ABSTRACT
Cruise control is a new technological development which incorporates a factor of comfort in driving. Safety is only a small benefit of this system. In short, cruise control can be said to be a system which uses the principles of radar to determine the distances between two consecutive moving vehicles in which either one or both of them is incorporated with this system.
INTRODUCTION
• Every minute, on average, at least one person dies in a crash.
• Air bags and seat belts save tens of thousands of people a year.
• But the ultimate solution and the only thing that will save far more lives, limbs and money is ? till 1958.
• Cruise control was commercially introduced in 1958 as an option on the Chrysler Imperial.
WHAT IS CRUISE CONTROL?
• Cruise control is a system, which automatically controls the speed of an automobile.
• Most cruise control systems don’t allow the use of cruise control below a certain speed.
• Blind inventor and mechanical engineer Ralph teetor invented cruise control in 1945.
BASIC OPERATION
• The basic operation of a cruise controller is to sense the speed of the vehicle, compare this speed to a desired reference, and then accelerate or decelerate the car as required.
• A simple control algorithm for controlling the speed is to use a "proportional plus integral" feedback.
• The performance of the system is robust with respect to it’s mass uncertainty.
HOW TO SET CRUISE CONTROL ?
• On &off
• set/accelerate
• Resume
ADAPTIVE CRUISE CONTROL
• Adaptive Cruise Control (ACC) is an automotive feature that allows a vehicle's cruise control system to adapt the vehicle's speed to the traffic environment.
• In May 1998, Toyota became the first to introduce an ACC system on a production vehicle,luxury sedan.
• ACC systems detect the vehicle ahead through the use of either radar or lidar(light detecting and ranging).
• Lidar based ACCsystems are limited due to their poor working in bad whether.
PARTS AND WORKING
The main components of a typical radar-based ACC system are
• Fusion sensor
• Headway control unit
• Throttle
• Brake
• Dashboard display
Fusion sensor: It is a combination of sensors and processors. They are
• Millimeter-wave radar
• Stereo camera
• Image processor
• Fusion processor
• Millimeter wave radar: It is a sensor which uses millimeter wave for detecting the position and velocity of a distant object.
• Range is calculated using the formula
C = 2*R/T
Where ‘C’ is the velocity of light
‘R’ is the range
‘T’ is the time of flight of transmission.
• Stereo camera: The camera’s function is detection of cars and other objects in the roadway.
• Image processor: It processes the images from the stereo camera and the data fed into the fusion processor.
• Fusion processor: The function of fusion processor is Data Fusion.
Headway control unit: It has control on the brakes and throttle and uses dashboard for immediate warnings.
Canceling Cruise Control Operation:
• Brake pedal is pressed
• 'Off' button is pressed
• Vehicle Speed < 25 mph
• An ACC system fault is detected
DANGERS OF CRUISE CONTROL
• It’s use on wet and slippery roads may cause serious problems.
FUTURE ASPECTS
• CACC(co-operative adaptive cruise control) tested in California.
• At 100 km/hr, that would amount to a distance between cars of less than 14 meters (roughly two car lengths).
• Fujitsu Ten has demonstrated a prototype system for so called called stop-and-go adaptive cruise control.
CONCLUSIONS
• Fully autonomous car is probably not viable in the foreseen future.
• Near by vehicles would be in constant communication with each other and act co-operatively.
• It will probably take decades, but car accidents may eventually become almost as rare as plane crashes are now.