Rotation Rate Sensor
The Rotation Rate Sensor is mounted on a metal bracket under the drivers seat. The sensor provides information to the MK60 concerning the vehicles speed around its main axis (yaw).
The sensor has a three pin connector with the following connections:
- 5V reference
- Signal
- Ground
The sensor receives a reference voltage of 5V from the MK60 control unit and provides a signal output of approximately 0.25 to 4.65V depending on the amount and direction of yaw. If the sensor is defective a constant voltage will be sent to the MK60.
The sensor element is a micro-mechanical double quartz tuning fork. A frequency of 11 Hertz is applied to one side of the fork and as the vehicle turns on it's axis, vibrations are induced on the other end.
The sensor analyzes the signal produced by the fork and produces an analog voltage signal that is proportional to the amount of yaw.
The rotation (yaw) rate is compared to the signal from the Steering Angle Sensor and the Transverse Acceleration Sensor. If physical limits are beginning to be exceeded, the MK60 DSC will begin regulation by engine and brake intervention to attempt to stabilize the vehicle. This is referred to as a GMR regulation.
The MK60 DSC III for M.Y. 2002 incorporates a combined Rotation rate and Transverse Acceleration Sensor. The Sensor is connected to the MK60 control unit by the CAN bus.
The Z3 version will retain separate sensors until the E36/7 is replaced by the E46/6.