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
400
350
300
250
200
150
100
50
0
NB Vehicles 3.5t - 12t GVM (1980 to 1995)
Class Average
143 mg/km.t
Repair Threshold
Vehicle 1269
113.2 mg/km.t
Original test
After repair
720
648
576
504
432
360
288
216
144
PM Emissions (mg/km.t)
-50
72
-100
0 20 40 60 80 100 120
0
Rank of Emissions
Figure A9-7
150
NOx Ranked Mass Normalised Emissions
NB Vehicles 3.5t - 12t GVM (1980 to 1995)
2.35
Repair
% above Class average
100
50
0
-50
Threshold
Vehicle 1028
1.06 g/km.t
Class Average
0.94 g/km.t
Original test
After repair
1.88
1.41
0.94
0.47
NOx Emissions (g/km.t)
-100
0 20 40 60 80 100 120
Rank of Emissions
0.00
Figure A9-8
200
Average Smoke Opacity Ranked Mass Normalised Emissions
NB Vehicles 3.5t - 12t GVM (1980 to 1995)
50
% above Class average
150
100
50
0
-50
Repair Threshold
50% above average
25%
Class
Average
17%
Original test
After repair
42
33
25
17
8
Average Opacity (%)
-100
0 20 40 60 80 100 120
0
Rank of Emissions
Figure A9-9
Page 93