CONTROLS, SENSORS & INSTRUMENTATION
Handling Camshaft Speed
Controlling camshaft speed can assist the governor;
helps prevent damage and excessive fuel consumption
Swiss specialist Jaquet has introduced a new function to its speed sensors — a special camshaft index sensor.
The camshaft index sensor has a fixed
pulse length of 250 µs and a defined
dwell time of 50 ms, and its use avoids
the disturbance of double pulses
caused by the torsional momentum of
the camshaft.
Once every two crankshaft revolutions, an index signal from the camshaft reports the top dead center of the
engine. As injection or ignition is controlled from the dynamic position of
the engine, it is vital that this information is reliable.
In most modern electronic control
units (ECUs), the software is check-
ing the correct number of teeth
between two index pulses. The en-
gine will immediately shut down on a
detected error. Jaquet explained that
with its camshaft index function,
unnecessary shutdowns of the engine
can be avoided without compromis-
ing its protection.
The Hall-effect speed sensors for diesel en-
gines by Jaquet feature a new function — a
special camshaft index sensor.
of sensors delivers the signals for all
possible functions on the engine.
Jaquet also offers differential sensor
structures for the best immunity against
electromagnetic interference, while all
its sensors have a classification certificate by the Germanischer Lloyd.
The Hall-effect speed sensors by
Jaquet have a blind front end and
robust stainless-steel housing for main-tenance-free use. A
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