Technical data

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The PLCD sensor essentially consists of a
special core made of soft magnetic material.
The entire length of the core is enclosed by a
coil (primary coil) with a further, short evaluator
coil at each end.
A permanent magnet approaching the sensor
causes local magnetic saturation and
therefore virtual division of the core.
A voltage, depending on the position of the
saturated area, is induced in the evaluator coils
when an appropriate alternating current is
applied to the primary coil. Consequently, the
length of the virtual parts of the core and
therefore the position of the saturated area
can be determined in this way.
The SMG control unit powers the sensor and
correspondingly processes, evaluates and
converts the signals.
The alternating voltage necessary for this
purpose is supplied by the ASIC (Application-
Specific Integrated Circuit) integrated in the
PLCD sensors.
Selector lever
The tasks of the selector lever are:
• To select the ranges D-N-R
• To change the operating modes D <-> S
• To activate launch control
• To activate the tow start function.
Eight Hall sensors determine the selector
lever positions which are sent individually to
the transmission control.
All selector lever positions are based on a
redundant design where a sensor switches to
ground and the corresponding redundant
sensor switches in positive direction to ensure
reliable detection even in the case of failure.
Gearshift paddles
The gearshift paddles can be used to perform
the following functions:
• Upshift and downshift (+/-)
• Change of operating mode from "D" to "S"
• Manual initiation of wheel circumference
teach-in function (the hill ascent assistant
no longer needs to be activated manually).
Drivelogic
The Drivelogic selector switch can be used to
choose between six gearshift programs in
sequential mode and five shift programs in
Drive mode.
The shift speed and therefore the shift
hardness are preselected in sequential mode.
The shift points can be influenced by the
setting in Drive mode.
Brake light switch
For redundancy reasons, the SMG control unit
receives the signal from the brake light switch
and the brake light test switch.
The signal from the brake light switch is used
for:
• Shiftlock function
• Brake detection
• Engine start
• Disengaging gear
• DSC activation.
The signal is made available via the CAN.
4 - PLCD sensor