Presented by
Subhendu Sur

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What is suspension system
Suspension is the term given to the system of springs, shock absorbers and linkages that connects a vehicle to its wheels
Serve a dual purpose – contributing to the car's handling and braking.
Protects the vehicle itself and any cargo or luggage from damage and wear
What is air suspension?
Air suspension is a type of vehicle suspension powered by an engine driven or electric air pump or compressor. This pump pressurizes the air, using compressed air as a spring. Air suspension replaces conventional steel springs. If the engine is left off for an extended period, the car will settle to the ground. The purpose of air suspension is to provide a smooth ride quality and in some cases self-leveling.
Overview
One of the earliest implementations of air suspension was by Messier in the 1920s.
Sir William Brush is the father of suspension system in automobiles
With a "leg up" on other companies GM used its experience with commercial buses' air suspension to introduce systems for its car lines, beginning with the 1958 model year. Air bags at each wheel replaced the standard coil springs, and had sensors to keep the car level under load and in turns. It was, however too slow to react in sudden maneuvers.
Air suspension
Comprises of compressor , suppling air to air tank
Pressure maintained – 5.6 to 7 kg/sq.m
Air bags – on each wheel
As load applied , air bags compressed actuating the levelling valve .
Air from the tank fills the compressrd air bag & hence raise the level of the frame.
Air from air bag gets released as load on chassis decreases .
Air suspension layout
Advantages of air suspension
These maintain a constant frequency of vibration whether the vehicle is laden or unladen.
Constant frame height is maintained.
It helps to reduce the load while the vehicle in motion i.e. the dynamic loading as the spring rate variation between laden and unladen weight is much less.
It gives smooth and comfort ride of the vehicle.
The stiffness of the system increases with the increase of the deflection.
Common Air Suspension Problems
Air bag or air strut failure
- due to old age, or moisture within the air system that damages them from the inside.
Compressor failure
- Primarily due to leaking air springs or air struts
- Compressor burnout may also be caused by moisture from within the air system coming into contact with its electronic parts.
Dryer failure
- which functions to remove moisture from the air system eventually becomes saturated and unable to perform that function