indicator diagrams of diesel engines
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DIESEL ENGINE POWER CALCULATIONTRANSCRIPT
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Pcom - Compression Pressure
Pmax - Maximum Pressure
There are 4 types of indicator diagrams that can be taken from he engine cylinder to know the condition and performance of the engine.
1. Power card / Power indicator diagram
2. Compression diagram
3. Draw card / Out of phase diagram
4. Light spring diagram
The area of indicator diagram is calculated by
Power Card
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POWER CARD
Compression Diagram
COMPRESSION DIAGRAM
Draw Card / Out of Phase Diagram
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DRAW CARD
Light Spring Diagram
LIGHT SPRING DIAGRAM
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DIESEL ENGINES
DIESEL ENGINE COMPONENTS
MEASURE INDICATED POWER
COMBUSTION
PISTON COOLING
INDICATOR DIAGRAMS
IRREGULARITIES IN INDICATOR DIAGRAMS
SCAVENGING
SCAVENGE FIRE
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Indicator Diagrams
The diagram is taken periodically from the indicator valve equipped on he cylinder head and combustion
condition is to be confirmed.
The compression pressure and maximum pressure in the cylinder can be presumed from the indicator
diagram.
Engine indicator is the device used to take the indicator diagram, which can be considered as a
'stethoscope ' for diesel engines.
Indicator diagrams give efficiency of combustion in the cylinder, condition of the running gear,
irregularities in fuel pumping and injection and a lot of things.
Planimeter (Usually used on board)
Mid Ordinate Method
Power card is taken with the indicator drum rotating in phase with the piston movement
The area within this diagram represents the work done during one complete cycle to scale
Mean Indicated Pressure (MIP) is obtained from this diagram to calculate power produced in the
cylinder
Compression diagram is taken in similar manner to the power card but the fuel shut off in the
cylinder
The height of this curve shows maximum compression pressure
If the compression and expansion line coincide, it indicates that indicator is correctly synchronized with
the engine
Reduction in height of this diagram shows low compression which may be due to worn cylinder liner,
faulty piston rings, insufficient scavenge air or leaky exhaust valve
Draw card is taken in a similar manner to power card with fuel pump engaged but with the
indicator drum 90 degree out of phase with the piston stroke
This diagram illustrates more clearly the pressure changes during fuel combustion. Fuel timings or injector
faults may be detected from its shape
Light spring diagram is taken similar to the power card and in phase with the engine and with
a light compression spring fitted to the indicator
This diagram shows pressure changes during exhaust and scavenge to an enlarged scale
It can be used to detect faults in these operations
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Last updated: April 2010.