4. 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.
*
5. *
*INTRODUCTION
*WHAT IS CRUISE CONTROL ?
*BASIC OPERATION
*HOW TO SET CRUISE CONTROL?
*ADAPTIVE CRUISE CONTROL
*PARTS AND WORKING
*DANGERS OF CRUISE CONTROL
*FUTURE ASPECTS
*CONCLUSION
6. *
*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.
7. *
Cruise control is a system, which automatically controls the speed
of an automobile.
The system takes over the throttle of the car to maintain a steady
speed as set by the driver.
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.
8. 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.
11. *
*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.
12. *ACC systems detect the vehicle ahead through the use of either radar or
lidar (light detecting and ranging).
*Lidar based ACC systems are limited due to their poor working in bad
whether.
13. *
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
15. *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.
16. *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
17. A car model with advanced cruise control system
18. It’s use on wet and slippery roads may cause serious problems.
DANGERS OF CRUISE CONTROL
19. *
*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
stop-and-go adaptive cruise control.
20. *
*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.
