Self-Study Program

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367_049
367_048
Gearbox control unit
Protective/substitute function in case of failure:
– The wheel speed value generated by the ESP
control unit is used as a substitute value (via
CAN bus)
– Limited DSP capability
G195 is located behind the valve assembly. It is
bolted to the gearbox housing and measures the
gearbox output speed at the ring gear of the
Ravigneaux planetary gear set. The ring gear has
special milled recesses for this purpose, and
serves as an encoder disc.
One of the principal signals of the electronic
gearbox control system is the gearbox output
speed. There is a direct correlation between
gearbox output speed and driving speed.
The gearbox output speed is required to realise the
following functions:
– Shift point selection
– Functions of the Dynamic Shift Program (DSP),
e.g. driving status evaluation
– Diagnosis of shifting components and
plausibility checking of engine and turbine
speed (gear monitoring)
Gearbox output speed sender G195
Gearbox output speed sender G195
Gearbox output speed sender G195
Ring gear of the Ravigneaux
planetary gear set
Milled recesses for
engine speed sensing