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    SELF-INFLATINGTIRES

    Seminar topic presented by-

    JNYANA JYOTI DAS

    ROLL NO: 11/M-!!

    "RAN#$: M#$ANI#AL

    S#TION: M%"&1

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    ABSTRACT

    elf inating tire system is an automaticmechanism for maintaining proper level of pressureinside the vehicle tires, or in other words it is an

    automatic ination or deation system used intires. This system reduces the wear of the tread ofthe tire and increases driving comfort. !t alsoincreases feel e"ciency and ensures safe driving.

    The main self inating used are #T! and T$system.

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    T$* "+,#%" #*/ 0,* #0$***"*$, %,

    Detect when the air pressure in a particular tirehas dropped, this means they have to constantlymonitor the air pressure in each tire.

    Noti'ythe driver about the problem

    In(ate the tire back to the proper level, this

    means there has to be an air supply as well as acheck valve that opens only when needed.

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    PARTS OF SELF-INFLATING SYSTEM

    Tire deation valves

    Tire inator hoses.To operate tire deationvalve this is screwed ontothe e%isting tire valve. !tinates the tire to arequired pressure.

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    CENTRAL TIRE INFLATION SYSTEM

    The idea behind the #T! is to provide control over the air

    pressure in each tire as a way to improve performance on

    di&erent surfaces. 'or e%ample, lowering the air pressure in

    a tire creates a larger area of contact between the tire and

    the ground and makes driving on softer ground much

    easier. !t also does less damage to the surface. This is

    important on work sites and in agricultural (elds.Another function of the #T! is to maintain pressure in the

    tires if there is a slow leak or puncture. !n this case, the

    system controls ination automatically based on the

    selected pressure the driver has set.

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    CTIS I"&*

    )ere is a look at the overall system.

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    A 0** ,* is located at each wheel end. 'or dual

    wheels, the valves are typically connected only to the outer

    wheel so the pressure between the two tires can be

    balanced. *art of the wheel valve+s ob is to isolate the tire

    from the system when it+s not in use in order to let the

    pressure o& of the seal and e%tend its life. The wheel valve

    also enables on-demand ination and deation of the

    tires.An **#$%" %"#$% '"# (ECU) mounted behind the

    passenger seat is the brain of the system. !t processes driver

    commands, monitors all signals throughout the system and

    tells the system to check tire pressures every / minutes to

    make sure the selected pressure is being maintained. The

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    The pneumatic control unit also contains a sensor that

    transmits tire-pressure readings to the 0#U.

    An %*$,#%$ %"#$% ,"* allows the driver to select tire-

    pressure modes to match current conditions. This dash-

    mounted panel displays current tire pressures, selected

    modes and system status. When the driver selects a tire-

    pressure setting, signals from the control panel travel to the

    electronic control unit to the "*'/,# %"#$% '"# to

    the wheel valves

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    TYRE MAINTENANCE SYSTEM

    The system has three main components1

    The tire hose assembly provides the air route to inate

    the tire and has check valves so that the air lines and

    seals do not have to be pressuri2ed when the system is

    not checking or inating the tires. This cuts down on

    wear and tear on the seals.

    The rotary oint is comprised of air and oil seals and

    bearings and connects the air hose from the non-

    rotating a%le to the rotating hubcap. !ts air seals prevent

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    The manifold houses the pressure protection valve,

    which makes sure the system doesn+t pull air if the

    brakes+ air supply is below 3/ psi. !t also houses an

    inlet (lter to keep the air clean, a pressure sensor to

    measure tire pressures and solenoids that control

    airow to the tires

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    The A!456 system is a constant monitoringsystem that uses a series of check valves todetect a loss in air pressure.

    When a tire loses pressure, due to a punctureor other seepage, a series of check valvesautomatically detects it.

    The ystem then immediately draws air from

    the vehicle7s pneumatic system and directs it toeach tire requiring air.

    The air pressure is delivered via the trailer7shollow a%le housing.

    The air then goes through the hub assemblyand into the tires. !t is completely isolated from

    the brake system

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    MERITOR TIRE INFLATION

    SYSTEMThe $eritor Tire !nation ystem 8$T!9 is designedfor use on tractor-trailers. !t uses compressed air

    from the trailer to inate any tire that falls below itsappropriate pressure. Air from the e%isting trailer airsupply is routed to a control bo% and then into eacha%le. The airlines run through the a%les to carry airthrough a rotary union assembly at the spindle end

    in order to distribute air to each tire. !f there issigni(cant air-pressure loss, an indicator lightinforms the driver.

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    9EY BENEFITS TO CONSUMER

    SAFETY

    :!n the United tates, ;;/ persons die and

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    CONCLUSION

    Automatic tire pressure ination system has manyadvantageous bene(ts in the transportation industry.

    These bene(ts include, improved vehicle mobilitydue to the increase in traction when tire pressuresare lowered, improved ride quality and cargo safety

    due to the reduction in vehicle vibration when thecorrect tire pressure is used for a particular roadcondition, reduced road maintenance becausesediment production is limited and lowered road

    construction cost, increased fuel e"ciency and aconsiderable increase in the tire life of the vehicles.

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    T$AN) YO* ALL

    +ORA,,R#IATIN.

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