This document provides an overview of automatic air suspension systems. It discusses the key components, including the air supply from the compressor, air bags that support the vehicle weight, and height control valves that regulate air flow to maintain proper ride height. The system works by sensing changes in vehicle weight and automatically inflating or deflating the air bags to keep the frame at the proper level. Benefits of air suspension include improved ride comfort, automatic load leveling, better vehicle handling, and reduced wear and damage.

1. PREPAIRED BY:- GUIDED BY:-
MRUTYUNJAYA SWAIN PROF. AMAR KUMAR DAS
DEPT OF MECH

2. 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

3. 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.

4. 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.

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

6. 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

7. 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.

8. 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.

9. BLOCK DIAGRAM OF HCV

10. 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.
•

11. 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

12. 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.

13. THANK YOU