GANDHI INSTITUTE FOR TECHNOLOGY

TOPIC ON:-

AIR SUSPENSION SYSTEM

PREPAIRED BY:- GUIDED BY:-MRUTYUNJAYA SWAIN PROF. AMAR KUMAR DAS

DEPT OF MECH

CONTENTS:-• Introduction • Role of Air Suspension System • Principle Of Air Suspension • Components of Air Suspension • Block diagram of HCV • Working of Automatic Air Suspension System• Advantages • Conclusion

INTRODUCTION:- • The automatic air suspension system is an air-operated, microprocessor

controlled suspension system. This system replaces the conventional coil spring suspension and provides automatic front and rear load leveling.

• The air bags, made of rubber and plastic, support the vehicle load at the front and rear wheels’.

• Sir William Brush is the father of suspension system in automobiles.

ROLE OF AIR SUSPENSION SYSTEM

• The main role of air suspension system are as follows: • It supports the weight of vehicle . • Provides smoother ride for the driver and passengers i.e. acts as

cushion. • Protects your vehicle from damage and wear . • It also plays a critical role in maintaining self driving conditions. • It also keeps the wheels pressed firmly to the ground for traction . • It isolates the body from road shocks and vibrations which would

otherwise be transferred to the passengers and load.

COMPONENTS OF Air SUSPENSION

• There are three fundamental components of air suspension system . • The air supply • Air bags • Height control valves

AIR SUPPLY

• The air supply is engine air compressor, the air tanks, air valves, and air lines.

The engine air compressor supplies air for every piece of air equipment on the vehicle. The maximum pressure supplied by the compressor varies.

The air supply was maintained around 120 to 125 psi but on some newer, larger vehicles this has been increased to 135 psi. 1 psi =4.448/(0.025m)^2=6894.75m^2 1 atm =14.70psi

AIR BAGS

• Air bags. Air bags are simply a rubber bladder that holds air. Air bags are also referred to as air springs . The air bags are located between the frame of the vehicle and the vehicle axles.

• There will be one air bag for each side of each axle in the vehicle. When two bags per side are used, one will be in front of the axle and the other behind the axle.

HEIGHT CONTROL VALVE

• The height control valves are kind of the brains of the system. They dictates how much air is in the air bags. This indicates the height the vehicle sits at, thus, Height Control Valve.

• The HCV is mounted to the frame of the vehicle. An L shaped linkage attaches the HCV to the axle.• There is an air line from the air supply to the HCV and HCV to the air bag that it

controls. The HCV also has an exhaust port. • When the connecting linkage moves up, the HCV connects the air supply to the air

bag(s), inflating the bag(s). When the connecting linkage moves down, the HCV connects the air bag(s) to the exhaust port, deflating the bag(s). This controls the height of the vehicle.

BLOCK DIAGRAM OF HCV

WORKING OF AIR SUSPENSION SYSTEM • The vehicle is supported on the frame with an arrangement of air bags. The engine air compressor supplies air to

the height control valves (HCV) mounted to the frame of the vehicle. The height control valves are connected to the air bags with an air line.

• When weight is added to the vehicle the air in the air bags are compressed, the frame moves closer to the axle. This forces the HCV linkage up. As the linkage moves up, the valving of the HCV connects the air supply to the air bags The added pressure and volume inflates the air bag causing the frame to move away from the axle. As the frame moves back to the proper ride height, the HCV linkage moves to the neutral position. This moves the valving away from the air supply and locks the air in the air bag to maintain the proper ride height.

• As weight is removed from the vehicle or the suspension shifts weight away, the existing pressure in the air bag(s) can push the frame away from the axle. The HCV linkage is pulled down. This connects the air bag(s) to the HCV exhaust port. As air is exhausted from the air bags the frame lowers back down towards the axle. As the linkage moves up to the neutral position, the exhaust port is closed and the air is again locked in the air bags maintaining proper ride height.

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ADVANTAGES

• Excellent Suspension & Comfort to passengers • Fully Automatic Level Control • Good handling • Shields the vehicle from damage • Keeps the tires pressed firmly to ground • Easy To Service • Lifting & Lowering Function • Increases life of vehicle

CONCLUSION • Suspension system provides the energy to a vehicle to protect itself

from damaging, increasing life of the vehicle ,increases the handling, increases comfort of passengers and many more. • So, according to me if you remove the suspension system, then you

feel like in bull- cart in Audi , Mercedes types luxurious cars. • So, the scope of Suspension System is Too Bright.

THANK YOU