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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

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 119 120

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BMW M5 Wartungshandbuch Seite 54