seminar slides acc

8/2/2019 Seminar Slides ACC

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ADAPTIVE CRUISE CONTROL


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Introduction to ACC

Adaptive Cruise Control (ACC) technologyautomatically adjust the vehicle speed anddistance to that of a target vehicle. ACCuses a long range radar sensor to detect atarget vehicle up to 200 meters in front andautomatically adjusts the ACC vehicle speedand gap accordingly.

ACC automatically decelerates oraccelerates the vehicle according to thedesired speed and distance settingsestablished by the driver. As per standardcruise control the driver can override thesystem at any time.


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Base of ACC: CRUISE CONTROL

The main developer of cruise control was RalphTeetor in 1945.

Cruise Control is a system, which automaticallycontrols the speed of an automobile. The driver sets

the speed and the system will take over the throttleof the car to maintain the speed.


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FEEDBACK OF CC


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SOFTWARE SUPPORT

The cruise control system is a small microcontrollercomputer that is normally found under the hood or

behind the dashboard of the car.

1. Proportional Control

2. PID Control


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Diagram-01 Software Working


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Description of ACC

This new system can automatically adjust speed inorder to maintain a proper and safe distance

between vehicles in the same lane.

The essential difference in function between ACC

and standard cruise control is that a car with ACCwill safely follow a vehicle that is travelling at aslower speed than the cruising speed to which thedriver has set the ACC.


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Diagram-02 ACC: Description


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Components

The main components of a typical radar-based ACCsystem are the following.

1. Fusion sensor

2. Headway control unit

3. Throttle

4. Brake

5. Dashboard display


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Working

Millimeter-wave radar is a method used fordetecting the position and velocity of a distantobject.

Velocity and range is derived, by measuring the

Doppler frequency shift and time of flight oftransmission. Range is calculated using theformula

C = 2*R/T

Where C is the velocity of light

R is the range

T is the time of flight of transmission.


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Diagram-03 Working Process


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Diagram-04 Process Output


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Conclusion

ACC can only respond to a difference between itsown speed and the speed of the car ahead,cooperative systems will two or more cars tocommunicate and work together to avoid a collision.

The automobile, which transformed the developedworld by offering mobility and autonomy, will finallystop exacting such an enormous cost in human lives.


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Queries...

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