EBD ppt

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PRESENTED BY :-S. AKASH KUMAR PATRO ROLL NO:- 201460008

TECHNICAL SEMINAR 2015

Under The Guidance Of - Mr. Agyan Kumar Prusty

By :- S. Akash Kumar Patro Roll No. : 201460008

MCA, 2th Semester

ELECTRONIC BRAKE FORCE DISTRIBUTION.

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OUTLINE


• INTRODUCTION• HOW ABS WORKS?• HOW EBD WORKS?• ELECTRONIC BRAKE FORCE DISTRIBUTION COMPONENTS

– SPEED SENSORS– BRAKEFORCE MODULATORS– ELECTRONIC CONTROL UNIT

• BENEFITS OF EBD.• WHEN WOULD EBD BE USEFUL?• IS EBD EFFECTIVE? • ARE THERE ANY LIMITATIONS WITH EBD?• HOW CAN WE GET THE OST OUT OF EBD SYSTEM? • IS EBD USEFUL IN ALL SITUATIONS OR NOT? • HOW PRELEVANT IS EBD IN TODAYS VEHICLE? • HOW MUCH DOES EBD COST? • CONCLUSION• REFERENCES

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INTRODUCTION• Electronic brake force distribution (EBD or EBFD) or electronic brake force

limitation (EBL) is an automobile brake technology that automatically varies the amount of force applied to each of a vehicle's brakes, based on road conditions, speed, loading, etc. Always coupled with anti-lock braking systems, EBD can apply more or less braking pressure to each wheel in order to maximize stopping power whilst maintaining vehicular control.


Image source-http://auto.howstuffworks.com/car-driving-safety/safety-regulatory-devices/electronic-brake-force-distribution2.htm

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• Under heavy braking, vehicle wheels may lock-up due to excessiveness of wheel torques over tire-road friction forces available, caused by too much hydraulic line pressure. The anti-lock braking system (ABS) monitors wheel speeds and releases pressure on individual wheel brake lines, rapidly pulsing individual brakes to prevent lock-up. During heavy braking, preventing wheel lock-up helps the driver maintain steering control. Modern ABS has an individual brake line for each of the four wheels, enabling different braking pressure on different road surfaces.

HOW ABS WORKS?


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HOW EBD WORKS?• EBD reduces the strain on the hydraulic brake force proportioning

valve in the vehicle. EBD optimizes the brake design with regard to: adhesion utilization; driving stability; wear; temperature stress; and pedal force."

• EBD may work in conjunction with ABS and Electronic Stability Control ("ESC") to minimize your accelerations during turns. ESC compares the steering wheel angle to vehicle turning rate using a yaw rate sensor. "Yaw" is the vehicle's rotation around its vertical centre of gravity (turning left or right).



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ELECTRONIC BRAKE FORCE DISTRIBUTION COMPONENTS

– SPEED SENSORS-To determine the slip ratio of a wheel, the EBD system needs two pieces of information: the speed at which the wheel is rotating and the speed of the car.

– Brake force modulators: Brake force is applied to the wheels hydraulically, with brake fluid pumped into brake lines in such a way as to pneumatically activate the brake cylinders.

– Electronic Control Unit (ECU): The ECU is a small computer embedded in the antilock braking system. It receives input from the speed sensors, calculates the slip ratio of the wheels, and uses the brake force modulators to apply an appropriate amount of force to keep the slip ratio of each wheel within a reasonable range.



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Benefits of Electronic Brake Force Distribution• It can deduce the car from the slip ratio of the wheels and compensate

accordingly in icy or watery roads.• When a truck with heavy loads apply brakes the system becomes aware of it

through its effect on the slip ratio of the tires.• In a speedy car when you apply brakes it desperation you turn the steering

wheel to one side to go around the stopped car, even while you're still pressing down on the brake.



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When would EBFD be useful?• While braking, one wheel goes over a pothole in the road, destabilizing the

vehicle and making braking less efficient. • One of your wheels is on ice, making it more likely that it will lock and cause

your car to spin out.• An animal comes out onto the road and you need to brake and swerve. • Another motorist does not notice you when making a lane change, and you

are forced to brake hard



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Is EBFD effective?• Heavy braking will be more comfortable: since braking is more effective with

EBFD, your vehicle will stop faster.• Enhanced overall vehicle safety: EBFD will help reduce your risk of fishtailing,

spinning, over steering, and understeering.• Improved braking predictability and by automatically adjusting brake-force to

its optimal distribution, EBFD can help reduce the effects of these factors and make braking more predictable.


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Are there any limitations with EBFD?• Yes. As with most vehicle safety systems, realizing the benefits of EBFD

depends on whether drivers understand its design limits and primary function, and can interact appropriately with it.– EBFD cannot warn you of impending collisions or of bad road conditions, so it is up

to you to assess road conditions and notice any potential hazards.

To overcome from this problem.A new technique was taught as a method to prevent wheels from locking,

modern ABS with EBFD systems work by pumping the brake automatically for you.



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Is EBFD useful in all situations or not?• Most EBFD systems can be disabled by either manually disconnecting

a fuse or depressurizing the brakes from within the vehicle. – First, since it is unlikely that EBFD will ever make a situation less safe, there are

virtually no advantages to be gained from turning it off. – Second, since most EBFD systems are paired with ABS you should never disable

one without disabling the other. This is important since ABS setups that include EBFD anticipate the activation of EBFD when it is necessary



12PRESENTED BY :-S. AKASH KUMAR PATRO ROLL NO:- 201460008

How prevalent is EBFD in today’s vehicles?• Electronic brake-force distribution began being installed with ABS

systems in the mid-2000s. Most modern ABS systems now include EBFD and ESC as a standard or optional add-on. In the model year 2010, 89% of cars and 99% of new light trucks had ABS installed; however there are no data on how many of these ABS systems included EBFD.




How much does EBFD cost?• EBFD is a standard part of modern ABS setups. Therefore,

equipping a vehicle with EBFD costs the same as installing ABS: approximately $240.00 in the factory. In addition, installing EBFD on a vehicle has virtually no impact on overall fuel efficiency.

A precision laser is used at the Bosch engineering centre in Abstatt, Germany



Conclusion• EBFD can help make braking on poor road conditions as safe as possible, but

this does not mean that it’s completely safe. There are still many dangers associated with driving in bad weather conditions, including low visibility and less overall traction. Whether or not EBFD helps also depends on how quickly you react to a potential hazard and how safely you can steer to avoid it. Given both of these limiting factors, you are always encouraged to use vehicle safety features like EBFD to complement your responsible driving practices, and not as a reason for driving less attentively or less cautiously.

A video to understand better…….


15PRESENTED BY :-S. AKASH KUMAR PATRO

ROLL NO:- 201460008


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