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Cruise control systems

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Publicada em: Indústria automotiva
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Cruise control systems

  1. 1. By Yusha Patel (TYME-A)
  2. 2. 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. *
  4. 4. * *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.
  5. 5. *  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.
  6. 6.  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.
  7. 7. Block diagram of cruise control model
  8. 8. * *On &off *set/accelerate *Resume • Coast • Brake & clutch
  9. 9. * *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.
  10. 10. *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.
  11. 11. * 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
  12. 12. Architecture of a radar-based ACC system
  13. 13. *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.
  14. 14. *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
  15. 15. A car model with advanced cruise control system
  16. 16. It’s use on wet and slippery roads may cause serious problems. DANGERS OF CRUISE CONTROL
  17. 17. * *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.
  18. 18. * *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.
  19. 19.  www.howstuffworks.com  www.cars.com/features/adaptivecruisecontrol  www.autorepair.com  http://en.wikipedia.org/wiki/Cruise_control