Emissions Control Performance of Euro 6b to Euro 6d-TEMP Diesel Cars within and outside of RDE Conditions

Authors

R. Williams, Shell, London; J. Andersson, Ricardo UK, Shoreham-by-Sea; Dr. H. Hamje, Concawe, Brussels; P. Ziman, PHS Consulting, Chester; Dr. K. Kar, ExxonMobil, Paulsboro, USA; C. Fittavolini, L. Pellegrini, Eni, San Donato Milanese; Dr. G. Gunter, Phillips 66, Bartlesville, USA; Dr. F. Oliva, Repsol, Madrid; Dr. J. Rogerson, INCIBI Ltd., Oxford

Year

2019

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 811

Summary

Development and implementation of new regulatory test procedures including the Chassis Dynamometer (CD) based World Harmonised Light Duty Test Procedure (WLTP) and the Real Driving Emissions (RDE) procedure has been motivated by the close scrutiny on real driving emissions. It is primarily diesel, passenger cars that have been the focus of recent attention. Certification RDE cycles cover a large proportion of normal European driving but RDE compliant vehicles may be challenged by the most extreme high speed, low speed congested or low temperature conditions which have historically been more demanding for diesel NOx control. Concawe has conducted a study of four diesel passenger vehicle types that span Euro 6b- to Euro 6d-TEMP and represent different exhaust after-treatment technologies. Tests were conducted over a compliant moderate RDE on-road cycle, as well as CD testing of the Transport for London (TfL) Urban Inter Peak (UIP) cycle, developed directly from real-driving of buses in congested traffic in London, UK. TfL UIP tests were run over ambient temperatures ranging from -15°C to 23°C. Differences in NO_x control were evident due to the different aftertreatment hardware but also due to different vehicle calibration strategies. The Euro 6d-TEMP vehicle was also tested at a high speed steady state condition on the CD representing high speed autobahn driving. Under this condition NO_x emissions were 12mg/km, signalling a step improvement in high speed NO_x control from diesel passenger cars versus previous generations. The data generated provides insights into the emissions performance of Euro 6 diesel passenger cars, and their after-treatment systems, from extreme congested cold urban conditions up to high speed autobahn driving and over the official RDE cycle.