Rpm sensor component description - GF27.19-P-1112CWX
TRANSMISSION 722.9 in MODEL 204.0 up to Model Year 8
Turbine speed sensor
Location
The turbine wheel rpm sensor is permanently connected to the fully integrated transmission control controller unit (Y3/8) and cannot be replaced separately.
Task
The turbine wheel rpm sensor detects the rotational speed of a ring gear of the Ravigneaux set for the fully integrated transmission control (VGS). Together with the information from the internal transmission speed rpm sensor and the output shaft rpm sensor, this is processed as an input signal by the fully integrated transmission control unit (Y3/8n4). This contributes to shortening the reaction time during shift operations.
Function
A permanently magnetized pole wheel (ring magnet) and the turbine wheel rpm sensor, which consists of magnetoresistive elements, are used to detect the turbine speed. A magnetoresistive element changes its resistance under the influence of a magnetic field. The ring magnet is stuck onto an aluminum ring plate and is connected with a ring gear of the Ravigneaux set. Magnetic field changes occur due to the rotary motion of the ring gear and as a result a resistance change occurs in the magnetoresistive elements An electronic analysis system passes on this information to the fully integrated transmission control unit. By using this speed recording system the measurement can take place over a greater distance than with the Hall sensor.