Digital Pressure Indicator DPI - Bedienungsanleitung
28 Friedrich Leutert GmbH & Co. KG
E
A
B
D
C
Some important pressure values to be read from the cylinder pressure
curve are plotted in the graphic above.
A: Peak pressure
Shows the maximum pressure value of the measurement curve, also
known as ignition pressure.
B: Compression pressure
Pressure measured at the top dead center of the respective cylinder.
C: Start of combustion
D: Differential pressure
Peak pressure minus the pressure at the start of combustion.
If the value is 0 the beginning of the combustion of the engine can-
not be clearly assigned. This can also be the case with engines with
a very early injection or engines having a combustion with linear
beginning.
E: Expansion pressure
Pressure at a particular point in the expansion phase, e.g. 36 ° CA
(crankshaft angle) after top dead center.
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