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Bus emission measurements

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

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  1. Bus emission measurements Matti Kytö, Kimmo Erkkilä & Nils-Olof Nylund 1.12.2009

  2. 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

  3. Emission testing using truthful dynamic bus cycles

  4. 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

  5. Summary of all buses Best CNG buses

  6. 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

  7. Newest city buses EEV CNG Lean-mix (malfunction?) EEV CNG Lean-burn CNG Stoich. & lean mix

  8. Maakaasu= natural gas

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