Non-road fuel consumption and pollutant emissions ... - BAFU - CH

Non-road fuel consumption and pollutant emissions FOEN 2008 36
The level of an engine’s fuel consumption and pollutant emissions depends on its age,
and in the emissions model this is taken into account using a deterioration (wear and
tear) factor. Different assumptions relating to wear and tear are made, depending on the
pollutant. The influence of wear and tear is calculated using the deterioration factors
indicated in Table 9.
Wear and tear (CF3)
Tab. 9 > Deterioration factors
Wear and tear (CF 3 ).
Engine type
Period of
CO HC NOX PM Consumption
deterioration (Ph)
Max. Max. Max. Max. Max.
2-stroke petrol 100 hrs 1.1 1.1 1.3 1.3 1.0 1.0 1.2 1.2
4-stroke petrol 500 hrs 1.1 1.1 1.5 1.5 1.0 1.0 1.2 1.2
Diesel 2000 hrs 1.1 1.2 1.15 1.3 1.0 1.0 1.1 1.2 1.0 1.0
The correction factor for the wear and tear of a machine (CF 3 ) can be calculated using
the deterioration factors (Tab. 9) and the number of operating hours to date. In the case
of diesel engines, for example, the PM emission factor increases by 10% every 2000
hours, the maximum increase is 20%, i.e. even after the number of operating hours
surpasses 4000 the emission factor is only increased by 20%.
Key
⎛
⎜
⎜
⎜
CF ( Alter ) = Verschlechterungsfaktor⎝
3
Re fjahr
∑
n=
Alter
H( n )
⎞
⎟
⎟
⎟
⎠
P
h
CF 3
H
P h
= correction factor for wear and tear (dimensionless)
= annual hours of operation at a certain age of the machine (hrs p.a.)
= period of deterioration (hrs)
In the model, in the case of diesel engines the maximum correction factor for the wear
and tear of a machine is attained after approximately 3800 hours of operation, after
which it is assumed that no further deterioration occurs.