design of low cost adaptive cruise control system using Micro controller

1. Adaptive Cruise Control

2. Aim
 Actively supports the driver in those
dangerous driving situations in which
there is a risk of skidding and keeps
the vehicle safely on course

3. Objective
 To design a CAN Based system, that
effectively addresses the stability
problem in the automobiles during
high speed steering controls. Here
multiple sensors helps to integrate
environmental data to derive the
effective output.

4.  Skidding is one of the main reasons for traffic crashes
To overcome this skidding, ESC has become mandatory
for cars
 ESC, uses the speed sensors on each wheel and the
ability to brake individual wheels
 control unit that monitors steering wheel angle and
vehicle
rotation around the vehicle's vertical axis.

5. Functionality
 This unit uses the steering and
rotation information to detect that the
vehicle is about to travel in a
direction different from the one
indicated by the steering wheel
position. Then ESC automatically
brakes the appropriate wheel to help
the driver maintain control.

6. Block Diagram
Electronic
Stability Control
(ESC) ECU
Dashboard
Display (LCD)
TTCAN BUS
Front Left
Wheel
Control Unit
Front Right
Wheel
Control Unit
Rear Left
Wheel
Control Unit
Rear Right
Wheel
Control Unit
Steering
Angle
ECU
Steering Angle
Sensor
ADC
Break Pedal
Position ECU
Break Pedal
Position
Sensor
ADC

7. Structural Blocks
 Steering Wheel Position Sensing
 Front Object Sensing
 Wheel braking systems
 LCD
 CPU

8. ADVANTAGES
 ESC automatically brakes the
appropriate wheel to help the driver
maintain control.
 Checks where the driver wants to
steer and where the vehicle is
actually going, 25 times a second
 If it identifies a critical situation, it
reacts faster than the eye can blink.

9. WHERE IT IS BEING USED?
 A truck unexpectedly changes lanes and
forces the driver to take sudden avoiding
action.
 The curve of the road exit is tighter than
the driver thought.
 The door of a parked car suddenly open.
 A cyclist in front of the vehicle makes an
unexpected swerve to the left.
 A person suddenly runs across the road and
forces an avoiding maneuver.

10. What is CAN?
 Controller Area Network-IEE 802.14
 Two-wire (half duplex)
 High-speed network system.
 Link up to 2032 devicesLink up to 2032 devices
 is a multimaster networkis a multimaster network
 It uses CSMA/CD+AMPIt uses CSMA/CD+AMP
 Developed by Robert Bosch GmbH,
Germany in 1986

12. CAN advantagesCAN advantages
 EError detection correction on
transfer.
 Priorities for messages
 Max transfer rate up toMax transfer rate up to 1 Mbit/s
 4. Extensive distance max up to
6km with10 kbit/s
 5. Link up to 2032 devices.