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Brakes 57
9-5
Yaw Rate / Side Acceleration Sensor
This sensor consists of a combined micro-
mechanical yaw rate sensor and a side
acceleration sensor. It is located on a bracket on
the exhaust tunnel in front of the gear lever. This
location positions the sensor as close to the car's
center of gravity and center-line (X-axis) as
possible.
Its housing is hermetically sealed and filled with
nitrogen to protect the components from being
affected by the environment. The sensor is used
to measure the physical forces of the yaw rate
and the side acceleration of the vehicle.
Function, micro-mechanical yaw rate sensor
This sensor measures the rotational movement
around an optional axis. The yaw rate sensor is
used to detect and register all the rotational
movement around the car's vertical axis, i.e.
whether the car is turning. The sensor sends this
ACTUAL VALUE to the ESP control module,
which compares it with a DESIRED VALUE given
by the steering angle sensor.
The yaw rate is calculated as the car rotates
around its own axis and is expressed in
degrees/seconds.
Yaw rate can also be calculated by measuring
side acceleration, vehicle speed and steering
angle. If these three values correspond with the
value measured by the Yaw Rate Sensor (YRS),
then the system will assume that the car is
stable.
The main components in the YRS are two flexible
oscillator elements.