10
X
Z
Put in simple terms, therefore, the sensor consists of a microme-
chanical body which is permanently subjected to oscillation excita-
tion.
When the vehicle turns, the direction of movement of the oscillat-
ing body changes. These deflections relative to the direction of
movement (changes in movement) are processed digitially and
evaluated accordingly.
To measure rotation about the X and Z axes, a rollover sensor (for
rollover detection) and an inertial sensor (for ESC signal indicating
yaw rate about Z) are arranged at a 90° oset relative to each
other in the airbag control unit J234.
Airbag control unit J234
637_016b
Measurement of vehicle rotation about the X and Z axes
The sensors for the measurement of vehicle rotation about the X
and Z axes work on the "Coriolis force" principle.
When the disc rotates while the ball is rolling on the platform,
however, the ball is deflected in the direction of motion of the disc.
The degree of deflection depends on the rotational speed of the
disc.
637_012
637_016a
The Coriolis force acts on all bodies that move within a rotating
reference system. The eect of the Coriolis force is demonstrated
in the example given here. A ball is rolled on a disc. When the disc
is stationary the ball rolls straight across it.
637_088
Coordinates
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