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Technical presentation- Anti-lock braking system
- 2. FAIZZATY BINTI MD SHIRI 14235 MECHANICAL ENGINEERING FINAL YEAR 1ST SEM
- 3. The ABS Principal ABS Types How ABS Works? Comparison Advantages
- 4. Wheel lockup Skidding Loss of traction & vehicle control Reduce steering ability Slides out of control
- 5. With ABS system, the driver can brake hard, take the evasive action and still be in control of the vehicle in any road condition at any speed and under any load
- 6. Four channel - The best scheme - Provide greater safety - Most modern cars use this type Three channel - Individual control of front wheels - The rear wheels are monitored together - Found on pick up trucks
- 7. An ABS consists of the following components: • Wheel speed sensors • Brake calipers • Hydraulic motor • Pressure release valves • Control module Brake caliper Wheel speed sensor
- 8. ABS control module Sensor Brake pipe Hydraulic motor
- 9. COMPARISON
- 10. Advantages Maintain directional stability Control over steering during braking Safe & Effective Brake fluid pressure change automatically
- 11. From statistics approximately 40% of automobile accidents are due to skidding Cars with ABS are up to 65% more likely to be in fatal crashes than cars without ABS ABS is a live saving technology which allows steering while braking heavily
Editor's Notes
- -Statistics show that approximately 40% of automobile accidents due to skidding - Commonly occur on vehicle with conventionally brake system which can be avoided by adding device called abs
- 3 channel abs: This scheme, commonly found on pickup trucks with four-wheel ABS, has a speed sensor and a valve for each of the front wheels, with one valve and one sensor for both rear wheels. The speed sensor for the rear wheels is located in the rear axle. This system provides individual control of the front wheels, so they can both achieve maximum braking force. The rear wheels, however, are monitored together; they both have to start to lock up before the ABS will activate on the rear. With this system, it is possible that one of the rear wheels will lock during a stop, reducing brake effectiveness
- Diagram 2 (above) shows the whole process in more detail. The four wheels shown are braking heavily as a result of heavy brake pedal application, and the green wheel is about to lock up due a low friction surface such as ice. The ABS control module (B) detects the onset of a skid through the sensor (A) in this wheel and reacts by releasing the brake pressure slightly by rapidly opening a pressure release valve (C). This lowers the pressure in the brake pipe (D) which causes the brake caliper to loosen its grip on the brake disc on the locking wheel. If this corrects the locked wheel, the hydraulic motor (C) will build up the pressure again to the optimum braking force and the valve will revert to the closed position.
- With abs – in the diagram above, the driver hits the brakes hard on the starting point (the line) then steers, and succesfully manages to avoid obstacle. Abs prevents the wheels from locking and this allows your steer. Without abs – as the driver applies brakes the wheels lock. Despite applying steering lock, the car continuous straight ahead due to the loss of steering control. And a collision results.
- It allows the driver to maintain directional stability Abs also control ober steering during braking The abs system is safe and effective Automatically changes the brake fluid pressure at each wheel to maintain optimum brake performance