Abstract
Abstract In order to better reflect the actual ecological performance of vehicles in traffic conditions, both the emission standards and the applied emission tests are being developed, for example by considering exhaust emissions for a cold engine start. This article presents the research results on the impact of ambient temperature during the cold start of a gasoline engine in road emission tests. The Real Driving Emissions (RDE) tests apply to passenger cars that meet the Euro 6 emissions norm and they are complementary to their type approval tests. A portable emissions measurement system was used to record the engine and vehicle operating parameters, as well as to measure the exhaust emissions during tests. This allowed for parameters such as engine load, engine speed and vehicle speed to be monitored. The cold start conditions for two different temperatures (8°C and 25°C) were compared in detail. Moreover, the engine operating parameters, exhaust concentration values and road emissions for the 300 s time interval, were compared. The summary of the article presents the share of a passenger car’s cold start phase for each exhaust compound in the urban part of the test and in the entire Real Driving Emissions test depending on the ambient temperature.
Highlights
In order to better reflect the actual ecological performance of vehicles in traffic conditions, both the emission standards and the applied emission tests are being developed, for example by considering exhaust emissions for a cold engine start
According to the Commission Regulation (EU) 2016/646 of 20 April 2016 amending Regulation (EC) No 692/2008 a new emissions norm Euro 6d-Temp has been established. The requirements of this norm are an extension of the Euro 6 emissions norm regarding road exhaust emissions of nitrogen oxides (NOx) and the particle number (PN) emissions for passenger cars equipped with gasoline engines, as well as introducing conformity factors which have been given the value of 1.43
The studies carried out so far indicate that the best reflection of the actual ecological performance of motor vehicles is obtained during the emission tests from these vehicles in real traffic conditions
Summary
Abstract: In order to better reflect the actual ecological performance of vehicles in traffic conditions, both the emission standards and the applied emission tests are being developed, for example by considering exhaust emissions for a cold engine start. This article presents the research results on the impact of ambient temperature during the cold start of a gasoline engine in road emission tests. The Real Driving Emissions (RDE) tests apply to passenger cars that meet the Euro 6 emissions norm and they are complementary to their type approval tests. According to the Commission Regulation (EU) 2016/646 of 20 April 2016 amending Regulation (EC) No 692/2008 a new emissions norm Euro 6d-Temp has been established The requirements of this norm are an extension of the Euro 6 emissions norm regarding road exhaust emissions of nitrogen oxides (NOx) and the particle number (PN) emissions for passenger cars equipped with gasoline engines, as well as introducing conformity factors (excess emissions) which have been given the value of 1.43 (from 2020). While Package 4 has added In-Service Conformity RDE testing and market surveillance
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