Cruise control is a system that automatically controls the speed of a vehicle to maintain a steady speed set by the driver. It works using radar to determine the distance between vehicles and accelerate or decelerate accordingly to keep the desired speed. Adaptive cruise control can also adjust speed based on traffic conditions, detecting the vehicle ahead through radar or lidar sensors. While improving comfort and safety, cruise control still poses some dangers, especially on wet roads, but cooperative adaptive cruise control tested in California shows promise for the future.

1. By Yusha Patel
(TYME-A)

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.

9. Block diagram of cruise control model

10. *
*On &off
*set/accelerate
*Resume
• Coast
• Brake & clutch

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

14. Architecture of a radar-based ACC system

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.

21.  www.howstuffworks.com
 www.cars.com/features/adaptivecruisecontrol
 www.autorepair.com
 http://en.wikipedia.org/wiki/Cruise_control