2.1.1
Table 1 lists
the engine performance parameters that should be measured, or calculated,
and recorded at each mode point during on-board NOx monitoring.
Engine Performance
Parameters
|
Symbol
|
Parameter
|
Dimension
|
| nd
|
Engine speed
|
min-1
|
| pbe
|
Charge air pressure at receiver
|
kPa
|
| P
|
Brake power (as specified below)
|
kW
|
| Paux
|
Auxiliary power (if relevant)
|
kW
|
| Tsc
|
Charge air temperature at receiver (if
applicable)
|
K
|
| Tcaclin
|
Charge air cooler coolant inlet temperature (if
applicable)
|
K
|
| Tcaclout
|
Charge air cooler coolant outlet temperature (if
applicable)
|
K
|
| TSea
|
Sea-water temperature (if applicable)
|
K
|
| GFUEL
|
Fuel flow (as specified below)
|
kg/h
|
2.1.2 Other engine settings necessary to define
engine-operating conditions, e.g. wastegate, charge air bypass, turbocharger
status, should be determined and recorded.
2.1.3 The settings and operating conditions of
NOx control devices should be determined and recorded.
2.1.4 The engine power and speed should be measured
to determine whether the engine is operated in a mode according to
the specified test cycles (cf. section
3.1 of these Guidelines).
2.1.5 If it is difficult to measure power directly,
uncorrected brake power may be estimated by any other means as approved
by the Administration (cf. NOx Technical Code, paragraphs 6.3.1.3, 6.3.3.2 and 6.3.7). Possible methods to determine brake
power include, but are not limited to:
-
.1 indirect measurement as per NOx Technical Code, paragraph 6.3.3.1; or by
-
.2 estimation from nomographs.
2.1.6 The fuel flow (actual consumption rate)
should be determined by: