hhj advanced safety system in automobiles

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    ABS Function, Design & Working

    ABS types

    Recent Advancements Effectiveness & Limitations

    Testing & Validation

    Job of the Driver

    Closing Remarks

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    To maintain the stability & steer-ability of the

    vehicle while the wheels are impending lock or

    skid in varying road conditions during braking.

    To maneuver in your intended direction during

    panic-stop situation.

    To stop the vehicle with minimum stopping

    distance.

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    Consisted of Mechanical components only-Drum, Flywheel.

    Relative angular speed difference between Drum & Flywheel causes some

    drop in main hydraulic line & thereby reducing brake pressure in the

    adequate amount.

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    i

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    Operation-Wheel speed sensor (A) senses the abnormal spinning of the

    wheel .-Signal(input strength) is sent to the ECU (B).

    -ECU processes it & communicates with HCU (C) to increase ordecrease the brake pressure Tin the brake line (D) to the affected

    wheel.

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    INPUT TOABS

    PROCESSING

    OUTPUT-OPTIMUMBRAKING PRESSURE

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    ABS Function, Design & Working.

    ABS types.

    Recent Advancements. Effectiveness & Limitations.

    Testing & Validation.

    Job of the Driver.

    Closing Remarks.

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    Four-channel, four-sensor ABS-This is the best scheme. There is a speed sensor on all four

    wheels and a separate valve for all four wheels. With this setup, the controller monitors each

    wheel individually to make sure it is achieving maximum braking force.

    Three-channel, three-sensor 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.

    One-channel, one-sensor ABS-This system is commonly found on pickup trucks with rear-

    wheel ABS. It has one valve, which controls both rear wheels, and one speed sensor, located

    in the rear axle.

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    ABS Function, Design & Working.

    ABS types.

    Recent Advancements. Effectiveness & Limitations.

    Testing & Validation.

    Job of the Driver.

    Closing Remarks.

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    Function-The job of the EBD as a subsystem of the ABS

    system is to control the effective adhesion utilization by the

    rear wheels & it automatically varies the amount of force appliedto each of a vehicle's brakes, based on road conditions, speed,

    loading/weight, etc.

    The pressure of the rear wheels is approximated to the ideal

    brake force distribution in a partial braking.

    EBD can apply more or less braking pressure to each wheel in order

    to maximize stopping power whilst maintaining vehicular control.

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    http://localhost/var/www/apps/conversion/tmp/scratch_10/corollaEBD.wmv
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    FUNCTION- To prevent loss oftraction of the driven road wheels, and therefore maintain the

    control of the vehicle when excessive throttle is applied by the driver (rapid acceleration) and

    the condition of the road surface (due to varying factors) is unable to cope with

    the torque applied.

    The intervention can consist of one or more of the following:

    Retard or suppress the spark to one or more cylinders.

    Reduce fuel supply to one or more cylinders.

    Brake one or more wheels.

    Close the throttle.

    In turbo-charged vehicles, the boost control solenoid can be actuated to reduce boost and

    therefore engine power.

    http://localhost/var/www/apps/conversion/tmp/scratch_10/TCS.mp4http://localhost/var/www/apps/conversion/tmp/scratch_10/TCS.mp4
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    ABS Function, Design & Working

    ABS types

    Recent Advancements Effectiveness & Limitations

    Testing & Validation

    Job of the Driver

    Closing Remarks

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    Reduces the risk of multiple vehicle crashes by 18 percent,

    Reduces the risk of run-off-road crashes by 35 percent.

    On high-traction surfaces such asbitumen, orconcrete, ABS reduces

    stopping distances.

    Better than Threshold braking.

    Reduces chances of skid & hence maintains the stability &

    steer-ability.

    Reduces wear & tear of tires.

    http://en.wikipedia.org/wiki/Bitumenhttp://en.wikipedia.org/wiki/Concretehttp://en.wikipedia.org/wiki/Concretehttp://en.wikipedia.org/wiki/Bitumen
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    ABS fails to function when all wheels get locked

    during braking.

    Drivers of vehicles equipped with ABS tend to be

    careless or overconfident (psychological influence).

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    ABS Function, Design & Working

    ABS types

    Recent Advancements Effectiveness & Limitations

    Testing & Validation

    Job of the Driver

    Closing Remarks

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    Stability & Steer-ability.

    Full braking on a curve & swerving.

    Stopping distance.

    More control on varying road conditions.

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    ABS Function, Design & Working

    ABS types

    Recent Advancements Effectiveness & Limitations

    Testing & Validation

    Job of the Driver

    Closing Remarks

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    In order for ABS to Function effectively, driver should

    press the brake pedal as hard as possible.

    Do not put off your feet from the pedal if you sense

    pulsing(-it indicates that ABS is working).

    Driver should normally steer the vehicle to its intended

    direction.

    Don't release the pedal until you have safely stopped.

    http://localhost/var/www/apps/conversion/tmp/scratch_10/3S%20RULES.wmvhttp://localhost/var/www/apps/conversion/tmp/scratch_10/3S%20RULES.wmv
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    ABS Function, Design & Working ABS types

    Recent Advancements Effectiveness & Limitations Testing & Validation Job of the Driver Closing Remarks

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    Today ABS is a utmost necessary advanced safety feature

    in almost any automobile.

    EBD, ESC & TCS assist ABS depending on their specificcapabilities and functions.

    Even an alert skilled driver would find it difficult without

    ABS to match the performance of vehicle with ABS.

    Even if your vehicle has ABS, Be attentive while driving.

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