fuzzy logic in automotive electronics

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fuzzy logic controlling of the automotives for braking systems and speed controlling systems

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Slide 1:

FUZZY LOGIC IN AUTOMATIVE ELECTRONICS

ABSTRACT:

ABSTRACT Man is intelligent with reasoning power and can respond to any critical situation. But under stress and tension he falls as a prey to accidents. The manual control of speed & braking of a car fails during anxiety. Thus automated speed control & braking system is required to prevent accidents. automation is possible only with the help of Artificial Intelligence (Fuzzy Logic).

INTRODUCTION :

INTRODUCTION Fuzzy logic is best suited for control applications, such as temperature control, traffic control or process control. Fuzzy logic seems to be most successful in two kinds of situations: Very complex models can understand easily, in fact, quite judgmental. Processes where human reasoning, human perception, or human decision making are inextricably involved.

Complexity of a System vs. Precision in the model of the System::

Complexity of a System vs. Precision in the model of the System:

Fuzzy Set vs. Crisp Set::

Fuzzy Set vs. Crisp Set:

Membership Function::

Membership Function: Membership function characterizes the fuzziness in a fuzzy set. It also specifies whether the elements in the set are discrete or continuous - in a graphical form

Features of membership function::

Features of membership function:

FUZZY LOGIC CONTROL SYSTEM: :

FUZZY LOGIC CONTROL SYSTEM: Obstacle Sensor Unit: The car consists of a sensor in the front panel to sense the presence of the obstacle.

Sensing Distance::

Sensing Distance: The sensing distance depends upon the speed of the car. As the speed increases the sensing distance also gets increased, the obstacle can be sensed at a large distance for higher speed and the speed can be controlled by gradual anti skid braking system. The speed of the car is taken as the input and the distance sensed by the sensor is controlled.

Input Membership Function: :

Input Membership Function:

Output Membership Function: :

Output Membership Function:

From this graph it is clear that the sensing distance almost varies linearly with speed and angle.:

From this graph it is clear that the sensing distance almost varies linearly with speed and angle.

Speed Control: :

Speed Control: The speed of the car is controlled according to the angle subtended by the obstacle. The angle subtended by the obstacle is sensed at every instant. In this controlling process angel between the obstacle and the road is taken as the input.

Speed Control: :

Speed Control:

Output - Membership Function: :

Output - Membership Function:

From this graph it is clear that the controlling the speed with respect to angle.:

From this graph it is clear that the controlling the speed with respect to angle.

Obstacles which the car can overcome: :

At any instant, if the obstacle subtends an angle less than 60°, then the car can overcome the obstacle and the speed of the car reduces according to the angle. Obstacles which the car can overcome:

Speed breaker: :

Speed breaker:

Fly over::

Fly over:

Obstacles which the car cannot overcome: :

At any instant, if the angle subtended by the obstacle is greater than 60°, then the car comes to rest before colliding with the obstacle as the car cannot overcome the obstacle. Obstacles which the car cannot overcome:

As the angle here is more than 60°, then the car comes to rest position before colliding the other vehicle :

As the angle here is more than 60°, then the car comes to rest position before colliding the other vehicle

Rear Sensing: :

Rear Sensing: This fuzzy control can be extended to rear sensing by placing a sensor at the back side of the car, and can be used to control the motion of the car when the wheals rotate in the opposite direction or when the car is in rear gear.

Conclusion::

Conclusion: In this world of stress and tension where the ‘drivers’ concentration is distracted in many ways, an automated accident prevention system is necessary to prevent accidents. The fuzzy logic control system can relieve the driver from tension and can prevent accidents. This fuzzy control unit when fitted in all the cars can result in an accident free world.

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