Principles Of Operation: Notes

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In a collision, the sudden deceleration or acceleration is measured by the safing sensor in the RCM and by the impact sensors. The RCM evaluates the readings to determine the impact point on the vehicle and whether the deceleration/acceleration readings exceed the limits for firing any of the air bags or pretensioners. During a collision, the RCM only fires the air bags and pretensioners if the safing sensor confirms that the data from the remote sensor(s) indicates an impact limit has been exceeded. The RCM also monitors the vehicle for a roll over accident using the internal roll over sensor.

The RCM incorporates the following impact thresholds to cater for different accident scenarios:

Front impact, pretensioners.
Front impact, driver and passenger air bags stage 1, belt unfastened.
Front impact, driver and passenger air bags stage 2, belt unfastened.
Front impact, driver and passenger air bags stage 1, belt fastened.
Front impact, driver and passenger air bags stage 2, belt fastened.
Rear impact.
LH (left-hand) side impact.
RH (right-hand) side impact.
Roll over.

The front impact thresholds increase in severity from pretensioners, through to driver and passenger air bag stage 2, belt fastened.