6.2.1
Pressure calculation
In the ICC system, the compression pressure of each cycle is calculated with the polynomial
formula and the data of the piston position. The ICC uses the values that follow for calculation,
refer to
:
•
Compression pressure at TDC (p
C
)
•
Pressure at start of ignition (p
I
) (001)
•
Maximum firing pressure (p
F
) (002).
NOTE:
If ignition is not exactly at TDC, the pressure at start of ignition p
I
is smaller than the
compression pressure at TDC p
C
.
The pressure increase is the difference between the maximum firing pressure p
F
and the pressure
at start of ignition p
I
. The ICC system sets the limit of this pressure increase related to the shop
test results. This prevents mechanical overload to the engine.
Fig 6-2
ICC - pressure diagram
001
002
Cylinder pressure (bar)
Crank angle (°)
Legend
001
Pressure at start of ignition (p
I
)
002
Maximum firing pressure (p
F
)
X72-B
AA00-9308-00AAA-043A-A
Operation Manual
Intelligent combustion control
Winterthur Gas & Diesel Ltd.
- 233 -
Issue 003 2021-12
