MAHA LPS 3000 - Calculate Engine Factor Fm

BA052301-en 39
2.9.6 Calculate Engine Factor fm
In most cases fm = 0.3 applies but this value can be changed.
The following equations are used:
Engine factor fm based on ISO 1585:
652,37 
r
q
14,1.036,0 −=
r
q
fm
2,37
r
q
2,0=fm
65
r
q
2,1=fm
Engine factor fm based on EWG 80/1269, SAE J1349 and JIS D1001:
6540 
r
q
14,1.036,0 −=
r
q
fm
40
r
q
3,0=fm
65
r
q
2,1=fm
Pressure behavior of the supercharging:
E
L
P
P
r =
Specific fuel consumption based on SAE J1349:
4-Takt Motoren
nD
F
q

= .120000
2-Takt Motoren
nD
F
q

= .60000
with
• fm Engine factor
• r Pressure behavior of the supercharging
• q Specific fuel consumption based on SAE J1349
• p
L
Absolute boost pressure
• p
E
Absolute pressure in front of the compressor
• F Fuel flow (mg/s)
• D Cubic capacity volume
• n Engine RPM