Rpm sensor component description - GF27.19-P-1112GT
TRANSMISSION 722.9 in MODEL 164.1 /8, 216, 221, 251.0 /1 up to Model Year 8 Turbine rotation speed sensor
Location
The turbine speed sensor (VGS) is firmly fixed to the electric control unit (VGS) (Y3/8) and cannot be replaced individually.
Task
The turbine speed sensor (VGS) records the rotational speed of a ring gear of the Ravigneaux set for the fully integrated transmission control (VGS). This is processed by the fully integrated transmission control (VGS) control unit (Y3/8n4) as an input signal together with the information from the internal speed sensor (VGS) and the output speed sensor (VGS). This contributes to shortening the reaction time during shift operations.
Function
A permanently magnetized pole wheel (ring magnet) and the turbine speed sensor (VGS), which consists of magneto resistive elements, are used to record the turbine speed. A magneto resistive 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 internal-geared wheel and as a result a resistance change occurs in the magneto resistive elements An electronic analysis system transmits this information to the fully integrated transmission control (VGS) control unit. By using this speed recording system the measurement can take place over a greater distance than with the Hall sensor.