BMW LCI 3 2015 Series Operating Manual page 12

3￿Series LCI
3.￿Powertrain
3.2.2.￿Engine￿speed￿adaptation￿for￿a￿gear￿change
During￿a￿gear￿change￿the￿engine￿speed￿is￿automatically￿adapted￿to￿the￿new￿transmission￿ratio.￿The
engine￿and￿the￿transmission￿input￿shaft￿have￿the￿same￿speed￿when￿engaging￿the￿clutch.￿This￿ensures
the￿clutch￿is￿always￿engaged￿smoothly.
Gear￿sensor￿in￿the￿manual￿gearbox
Index
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3.2.3.￿Gear￿sensor
In￿the￿3￿series￿LCI￿manual￿transmission￿a￿gear￿sensor￿is￿used,￿which￿detects￿the￿correct￿position￿of￿the
individual￿gears￿as￿well￿as￿the￿neutral￿position.￿This￿information￿is￿transmitted￿to￿the￿DME￿.
A￿mechanical￿reverse￿gear￿switch￿is￿no￿longer￿required.
There￿is￿a￿magnetic￿clip￿secured￿on￿the￿gearshift￿shaft.￿The￿alignment￿of￿the￿magnetic￿field￿lines￿of￿the
magnetic￿clip￿are￿evaluated￿by￿the￿gear￿sensor,￿which￿is￿screwed￿to￿the￿transmission￿housing￿from￿the
outside.
The￿'3D￿magnetic￿field￿sensor￿system"￿is￿integrated￿in￿the￿gear￿sensor.￿This￿type￿of￿gear￿sensor
measures￿magnetic￿fields￿which￿are￿aligned￿parallel￿to￿the￿chip￿surface.￿This￿ensures￿that￿every￿gear
shift￿and￿engaged￿gear￿is￿recognized.
The￿sensor￿is￿capable￿of￿self-diagnosis￿and￿can￿input￿a￿fault￿in￿the￿system.
Explanation
Gear￿sensor
Magnetic￿clip
Gearshift￿shaft
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