Technical data

12
7
Ionic current representation
The ionic current progression (curve) is
directly dependent on the cylinder pressure
and the ions in the cylinder.
Generally applicable:
Poor combustion => low cylinder pressure
Good combustion => high cylinder pressure
Free ions additionally split off or separate due
to pressure peaks that occur in the
combustion chamber during knocking
combustion. This results in a change in the
ionic current progression (curve).
The ionic current is measured and evaluated in
the ionic current control unit.
The resulting corrections to the engine control
are executed in the engine control unit.
6 - Pressure curve (top) and ionic current (bottom)
Index Explanation
1 Ionic current maximum by induction
of ignition coil
2 Ionic current maximum due to
ignition (flame front directly in area
of spark plugs)
3 The ionic current progression is a
function of the pressure curve