Estimation of nitrogen oxides emissions from petrol and diesel passenger cars by means of on-board monitoring: Effect of vehicle speed, vehicle technology, engine type on emission rates

NOₓ emission rates of 13 petrol and 3 diesel passenger cars as a function of average speed from 10 to 120 km/h, emission class (pre-Euro 1 – Euro 5), engine type were investigated by on-board monitoring on roads and highways of St. Petersburg using a portative Testo XXL 300 gas analyzer. The highest level of NOₓ emission 0.5–2.5 g/km was inherent to old pre-Euro 1 petrol cars without a catalytic converter. NOₓ emissions rates of Euro 1 and Euro 2 petrol cars changed within 0.15–0.9 g/km, Euro 3 – 0.015–0.27 g/km, Euro 4 – 0.013–0.1 g/km, Euro 5 – 0.002–0.043 g/km. Euro 3 – Euro 4 petrol cars generally satisfied corresponding NOₓ Emission Standards (ES), except cold-start period, Euro 5 petrol cars did not exceed ES. Warmed, stabilized engines of Euro 3 – Euro 5 petrol cars showed 5–10 times lower NOₓ emission rates than corresponding ES in the range of speed from 20 to 90 km/h. NOₓ emission rates of diesel Euro 3 and Euro 4 cars varied from 0.45 to 1.1 g/km and from 0.31 to 1.1 g/km, respectively. Two examined diesel Euro 3 and one Euro 4 passenger vehicles did not satisfy NOₓ ES at real use. Euro 3 diesel cars showed 28.9 times higher NOₓ emissions than Euro 3 petrol cars and Euro 4 diesel car demonstrated 17.6 times higher NOₓ emissions than Euro 4 petrol cars at warmed and stabilized engine at a cruise speed ranging from 30 to 60 km/h.


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  • Accession Number: 01608753
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 29 2016 1:58PM