Slide 1
ANTI-LOCK BRAKING SYSTEM
PRESENTED BYABHISHEK KANOO1NH10ME704DEPT OF MECHANICAL
ENGINEERING , NHCEA LIFE SAVER FOR RIDERSCONTENTS Wheel lockup
during braking causes skidding which in turn cause a loss of
traction and vehicle control
This reduces the steering ability to change direction. So the
car slides out of control.
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.
INTRODUCTION
ABS V/S NO ABS IN CARS
ABS V/S NO ABS IN BIKESSpeed Sensor A Hydraulic MotorHydraulic
PumpPressure Release ValvesControl Unit (Computer Controlled
Module)Brake Calipers
COMPONENTS OF ABS KIT
The ABS system causes the valves to constantly reduce hydraulic
pressure to brakes of the significantly lowered speed wheel thereby
causing reduction of braking force on the affected wheel. By this
process, the lower speed wheel starts turning faster than other
three wheels and when the electronic control unit finds that the
wheel is turning faster than the other three, automatically brake
hydraulic pressure to the affected wheel is increased by the ABS
system so that braking force is reapplied and the wheel slows
down.This complete process performed by the ABS system is repeated
continuously throughout the drive on mostly uneven roads and can be
easily detected by the driver of the car with the help of brake
pedal pulsation.
WORKING PRINCIPLE OF ABS Four-channel, four-sensor ABS There is
a speed sensor on all four wheels and a separate valve for all four
wheels
TYPES OF ABS
Three-channel, four-sensor ABS There is a speed sensor on all
four wheels and a separate valve for each of the front wheels, but
only one valve for both of the rear wheelsThree-channel,
three-sensor ABS There is 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.
Two-channel, four sensor ABS There is a speed sensor at each
wheel, with one control valve each for the front and rear wheels as
a pair
One-channel, one-sensor ABS It has one valve, which controls
both rear wheels, and one speed sensor, located in the rear
axle.
A- The Speed Sensor
B- The Control Module
C- The Hydraulic Unit With Pressure Releasing Valves
D- The Brake Pipe
ABS FUNCTIONALITY DIAGRAM
Maintain directional stability in steering during heavy/sudden
brakingSafe & EffectiveAbsorbs unwanted turbulence
shockwavesEasy Fault/Failure detection by the vehicle
ownerAutomatic change of brake fluid pressure in each wheel
ADVANTAGES OF ABSIncreased braking distances under some limited
circumstances (snow, gravel, "soft" surfaces),Very Costly
Maintenance of a Car equipped with ABS is required more
DISADVANTAGES OF ABSIn latest carsIn racing carsAlso in racing
bikesIn latest trucksIn upcoming 2 wheelers
APPLICATIONS OF ABS Anti-lock brake systems not only prevent
rider and motor vehicle from harm and damage by increasing active
safety, but also reduce significantly mental strain while riding
and braking.CONCLUSIONwww.wikipedia.com H. Mirzaeinejad, M.
Mirzaei, A novel method for non-linear control of wheel slip in
anti-lock braking systems, Control Engineering Practice vol. 18,
pp. 918926, 2010 S. .baslamisli, I. E. Kse and G Anlas, Robust
control of anti-lock brake system, Vehicle System Dynamics, vol.
45, no. 3, pp. 217-232, March 2007
REFERENCESPoursamad,Adaptive feedback linearization control of
antilock bracking system using neural networks, Mechatronics, vol.
19, pp. 767-773, 2009 A. V. Talpov, E. Kayancan, Y. Onit and O.
Kaynak, Nero-fussy control of ABS using variable
structure-system-based algorithm, Int. Conf. On Adaptive &
Intelligent System, IEEE Comput Society, DOI 10.1.1109 /
ICAIS.2009.35/ pp.166 S. B. Choi, Antilock Brake System with a
Continuous Wheel Slip Control to Maximize the Braking Performance
and the Ride Quality, IEEE Transactions on Control Systems
Technology, vol. 16, no. 5, September 2008
