300SL (129.061) L6-3.0L (104.981) (1991)
Roll Bar Control Module: Description and Operation
Roll-over bar crash-actuated trigger module (N53) up to approx. 05/95
The roll-over bar crash-actuated trigger module is located in the rear on the tunnel between the occasional seats. The control module contains two
piezo-electric sensors 1), which measure the vehicle acceleration in the longitudinal direction (X) and lateral direction (Y).
They are located in the control module correspondingly (90 ° angles).
The signal from the sensor elements are proportional to the acceleration and are processed mathematically according to the laws of trigonometry,
whereby a constant acceleration sensitivity is achieved in any desired direction in the horizontal plane. A position switch senses the vehicle inclination
(all around).
Soft top control module (N52) as of approx. 06/95
The roll-over bar trigger module is integrated into the soft top control module and located in the rear behind the right occasional seat.
The control module contains two piezo-electric sensors 1), which measure the vehicle acceleration in the longitudinal direction (X) and lateral direction
(Y).
They are located in the control module correspondingly (90 °angles).
The signal from the sensor elements are proportional to the acceleration and are processed mathematically according to the laws of trigonometry,
whereby a constant acceleration sensitivity is achieved in any desired direction in the horizontal plane.
The control module contains two cone-shaped tilt sensors. The first actuates at a vehicle inclination of 22 ° all the way around. The belt lock is controlled
by this sensor. A second cone- shaped tilt sensor replaces the previous rear axle switch and senses critical situations which can lead to roll-over. This
cone-shaped tilt sensor trips at a vehicle inclination of 52 ° triggering the roll-over bar.
1) A damped, piezo-ceramic bender bar mounted in the sensor is bent due to its inertia by negative acceleration, e.g. crash, braking, etc., producing a
voltage. This voltage serves for measurement of the acceleration.
All signals are generated and processed digitally.
The electronic control module is subdivided functionally into:
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Acceleration sensors (X and Y)
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Signal generation stage
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Processor
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Output stages
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Monitor
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Error memory
Signal generation stage