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Bus emission measurements. Matti Kytö, Kimmo Erkkilä & Nils-Olof Nylund 1.12.2009. Chassis Dynamometer for Heavy-Duty Vehicles.
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Bus emission measurements Matti Kytö, Kimmo Erkkilä & Nils-Olof Nylund 1.12.2009
Chassis Dynamometer for Heavy-Duty Vehicles Max. power: 300 kW (range 54 -110 km/h)Max. traction: 20,000 N (range 0 -54km/h)Inertia simulation: 2500 – 60,000 kgRoller diameter: 2500 mmMax. boggie load: 20,000 kgFast IGBT control enables transient operationTexel V6 data acquisition systemDriver’s aid with different dynamic driving cycles
Critical emission components • For urban air quality: • particulates • oxides of nitrogen (NOx) and specifically nitrogen dioxide (NO2) • new diesel technology: increased share of NO2 in exhaust • stoichiometric natural gas: close-to-zero direct NO2 • For global warming: • carbon dioxide (CO2) • methane (CH4) • Noise: • gas buses emit less noise than diesel buses
Summary of all buses Best CNG buses
Newest city buses Diesel EEV EGR + POC Diesel EEV SCR + CRT Diesel EEV SCR Diesel Euro 5 & EEV SCR Notice: Tighter scaling for EEV-results
Newest city buses EEV CNG Lean-mix (malfunction?) EEV CNG Lean-burn CNG Stoich. & lean mix