Definition:
The rotation rate signal corresponds to the vehicle rotation speed about the vertical axis.
The rotation rate sensor is mounted under the driver's seat.
Connector assignments:
Pin No. |
Signal |
|---|---|
1 |
Negative supply (0 V) |
2 |
Positive supply (12 V) |
3 |
Sensor signal |
4 |
Reference signal (2.5 V) |
5 |
Test signal |
The sensor supplies a signal voltage of 0.7 - 4.3 V. The difference between the signal voltage and reference voltage ranges from -1.8 to +1.8 V and corresponds to a rotation rate of -50 to +50 o /s.
The sensor is monitored with regard to its permissible offset values as of "ignition ON".
In addition, the plausibility of the values is constantly checked while driving by comparison with the following signal information:
The effective signal is measured continuously every 20 ms as of "ignition ON".
In order to check the electrical function of the sensor, the effective signal is overlaid by an electrical offset during every second cycle. This offset overlay is controlled by the test line. The constancy of this offset is checked in the DSC3 control unit.
Oscillating cylinder which is excited by various piezo-elements to an oscillatory frequency of 14 kHz.
The cylinder is deflected by the effect of a transverse force triggered by the transverse acceleration while cornering.
The cylinder deflection is set back to zero by an electronic control circuit; this value which represents a measure for the relevant rotation rate is then converted into an analog voltage i.e. linear characteristic.
The measured rotary speed is compared with the rotary speed required by the driver (from the steering angle information) and the driveable limit rotary speed (derived from the transverse acceleration information).
The vehicle controller corrects the rotary vehicle speed as required by specific brake interventions at the individual wheels.
This is intended to ensure a stable driving status under all driving conditions (braking, propulsion and free rolling).