Bosch DSC 3.X User Manual download pdf (Page 14)

Introduction to DSC

Rotation Rate Sensor (Bosch 5.3)

The new sensor is a major contributor of

the expanded capabilities of DSC III. When

the rotation rate sensor was introduced

with DSC III 5.3, the sensor was a stand

alone sensor located under the drivers

seat. On DSC III 5.7, the sensor is now a

combined sensor which also houses the

lateral acceleration sensor.

To access the sensor, the seat must be

removed, the door jamb interior trim pulled

out of the way and the carpet rolled back.

A sound insulating foam shell covers the

sensor, this too must be pulled upward off

of the sensor prior to removal.

Sensor Operation

The sensor is a sealed, self contained

microprocessor that monitors the vehicle’s

rate of rotational acceleration on it’s vertical

axis. This is referred to as the “yaw” angle.

The sensor contains an internal oscillating

cylinder which is excited by various piezo

elements to an oscillation frequency of

14KHz. This puts the cylinder in a free

floating neutral state. (zero point)

When driving, the cylinder is deflected

(rotated) by the effect of the forces from the

vehicle cornering - this produces the tor-

sional “twist” on the cylinder.

The sensor counteracts the “twist” of the

cylinder by increasing the pulse frequency

of the piezo elements to deflect the cylinder

back to it’s zero point.

The pulse frequency increase in measured and represent the real

time vehicle rotation rate. Based on the measurement, the sensor

produces a linear DC voltage that the DSC III control module uses

to determine yaw angle.

5 Pin

Plug

Mounting

Nuts

Components are not serviceable.

Photos are for reference only.

Oscillating

Cylinder

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 31 32

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Bosch DSC 3.X User Manual Page 14

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