Effect of fuel quality on emissions over RDE and a comparison of RDE and CD test emissions from Euro 6 diesel cars

摘要

Real driving pollutant emissions from passenger cars have come under close scrutiny in recent times due to a perceived divergence between stated certification performance and measured on-road performance. This has been most pointed in the case of NO_x emissions from diesel cars. These observations have fuelled the development and Implementation of new regulatory test procedures to include the Chassis Dynamometer (CD) based World Harmonised Light Duty Test Procedure (WLTP) and the Real Driving Emissions (RDE) procedure. To build understanding of the emissions performance of latest standard diesel passenger cars, Concawe has conducted a study of the CD and RDE performance of three vehicle types with different exhaust gas after-treatment configurations. For each vehicle, three tests were conducted over each of the RDE, WLTC and NEDC cycles and three further RDE tests were run on a second fuel to build understanding of fuel effects in the new test. The data generated provide insights into the on-road emissions performance of latest diesel passenger cars and how this compares to regulated emissions limits and results from CD tests run under comparable road load conditions.