Technical data

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Travel sensor G302 has a permanent magnet
which is mounted on the piston of the
working cylinder. The permanent magnet
effects a local magnetic saturation of the flat
steel core and influences the induction in the
secondary coils.
The position of the saturated region and
thereby the position of the piston (= position
of the selector sleeve) can thus be
determined by the coil system).
Design of the travel sensor
The travel sensor consists of a flat steel core
which is wound along its length with a coil to
form a so-called primary coil. At each end of
the steel core are short coils, the so-called
secondary coils. Both secondary coils are
connected in series so that their phases are
inverted (opposing).
The alternating current induced in them
increases sharply at first.
241_095
Secondary coil S2
Primary coil
Flat steel core
Permanent
magnet
Piston
Control unit for
travel sensor
J556
Hydraulic regulator
Secondary coil S1
Control unit for
additional shift
stage J554
S2
S1
P2
P1
The travel sensor is measured and assembled together with the hydraulic sensor and
the selector fork by the manufacturer. The travel sensor forms a single unit with the
hydraulic regulator and can only be replaced as a complete unit.
Further information can be found on Page 46, “Hydraulic regulator”.
Travel sensor G302