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CAN BASED CAR AUTOMATION SYSTEM


INTRODUCTION
EMBEDDED SYSTEMS

Embedded systems are designed to do some specific task, rather than be a general-purpose computer for multiple tasks. Some also have real time performance constraints that must be met, for reason such as safety and usability; others may have low or no performance requirements, allowing the system hardware to be simplified to reduce costs.
An embedded system is not always a separate block - very often it is physically built-in to the device it is controlling.

The software written for embedded systems is often called firmware, and is stored in read-only memory or flash convector chips rather than a disk drive. It often runs with limited computer hardware resources: small or no keyboard, screen, and little memory.
In the present project we are demonstrating the applications of the CAN protocol in the Car Automation. Here we are showing the Antilock Breaking System (ABS) and the Automatic Climate Control System.
The ABS brake system is the greatest innovation in active safety for cars that has saved many lives. The Anti-lock Braking System is designed to help the driver maintain steering control during hard braking, especially in slippery conditions. How it works: Imagine, you are driving a car without ABS on a slippery road (e.g. after a rain or snow). Suddenly, you notice something on the road right in front of you. You hit the brakes, and try to turn aside, but the steering doesn't work; the car just skids out of control. Why, because all the wheels are locked up while you are holding down the brake pedal. As a result, you lose the ability to steer the vehicle. The four-wheel ABS can help in situations like this. It prevents the wheels from locking up, helping you maintain steering control during braking. In a similar situation, driving a car equipped with four-wheel ABS, it would be easier for you to steer your vehicle while braking. Major components of the typical ABS system include speed sensors (one at each wheel), an electronic control unit (ABS computer) and a hydraulic control. The ABS computer constantly monitors the signal from each wheel speed sensor. When it senses that any of the wheels are approaching lock up during braking, the ABS computer sends the signal to the hydraulic control unit, which modulates the braking pressure for a corresponding wheel(s) preventing it from locking up.