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SUPPLEMENTARY RESTRAINT SYSTEM (SRS)
1
1.1. WORKING OF RESTRAINTS
RESTRAINTS WITH AIRBAGS
This restraint system falls under the category of
Supplementary restraint system.
SUPPLEMENTARY RESTRAINT SYSTEM
(SRS)
Air bags are the secondary restraint system, as the
vehicle occupant for the activation of air bags
requires no action.
!! WARNING
Every occupant shall wear seat belts whenever
they ride a vehicle. This is applicable whether a
vehicle is equipped with supplementary restraints
systems (SRS) or not.
WORKING OF SRS
Whenever there is an accident, the sensor
mounted remotely sends crash signal to the ECU.
The type of accident and its severity, determines
the time-to-fire different airbags in the system. The
basic function of an airbag is to provide cushioning
effect to occupants.
There are remote sensors mounted for sensing
different frontal and side accidents. These sensors
are connected to the electronic control unit (ECU)
of the system. When an accident event input signal
crosses a pre-defined threshold level in ECU, the
ECU triggers the relevant restraints components in
the system. This helps in providing necessary
protection to occupants. The airbags and seat belt
pre-tensioners get triggered through ECU signal.
The load limiter in the seat belts is a mechanical
device which gets activated when the forces on the
occupant upper body region crosses a defined
force threshold limit.
WARNING
RPLL seat belts for Driver and LL only Seat Belts
for Passenger should be fitted only in the vehicle
having both frontal airbags.
COMPONENTS
1. ECU
2. Remote Sensors
Front remote sensor / Front Impact Sensor
3. Air bags
Driver air bag
Passenger air bag
4. RPLL for Driver & LL only for Passenger
5. Clock spring
6. Airbag warning lamp
7. Airbag warning labels