Pilot Study, Fault Identification and Effect of Maintenance

Diesel Vehicle Emissions – In-Service Emissions Testing – Pilot Study, Fault Identification and Effect of Maintenance - Appendices
PM Ranked Mass Normalised Emissions
% above Class average
200
150
100
50
0
-50
ME & NC Vehicles 12t - 25t GVM (1980 to 1995)
Repair
Threshold
Vehicle 1428
71.8 mg/km.t
Class Average
58 mg/km.t
Original test
After repair
175
146
117
87
58
29
PM Emissions (mg/km.t)
-100
0 20 40 60 80 100 120
0
Rank of Emissions
Figure A9-13
% above Class average
150
100
50
0
-50
NOx Ranked Mass Normalised Emissions
ME & NC Vehicles 12t - 25t GVM (1980 to 1995)
Repair Thres hold
50% Above Class
Average
1.59 g/km.t
Class Average
1.07 g/km.t
Original test
After repair
2.68
2.14
1.61
1.07
0.54
NOx Emissions (g/km.t)
-100
0 20 40 60 80 100 120
0.00
Rank of Emissions
Figure A9-14
Average Smoke Opacity Ranked Mass Normalised Emissions
ME & NC Vehicles 12t - 25t GVM (1980 to 1995)
% above Class average
200
150
100
50
0
-50
Repair Threshold
50% Above Class Average
18%
Class Average
12%
Original test
After repair
36
30
24
18
12
6
Average Opacity (%)
-100
0 20 40 60 80 100 120
0
Rank of Emissions
Figure A9-15
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