This page contains a Flash digital edition of a book.
EMISSIONS TESTING Read more on climatic testing online at https://goo.gl/9CV30m or scan the QR code


❱❱ Left & right: On-Board Portable Emissions Measurement Systems (PEMS) enable readings to be taken on the move in real conditions


Wind of change for


emissions testing


Jonathan Newell finds out how the automotive industry is preparing for changes that are taking place in the way vehicles are tested for emissions.


I


n an industry still reeling from the VW emissions scandal and the subsequent demonisation of the diesel engine, the need to demonstrate the environmental cleanliness of its products in a way that is transparent and consistent is of paramount importance.


The regulatory framework covering vehicular air pollution has itself come under criticism and so there has been a flurry of activity amongst the regulatory authorities to improve and harmonise standards to introduce a consistent norm over the next few years. These changes in standards are resulting in a set of goal posts


that seem to be in almost constant motion between now and the mid-2020s. To understand how the industry can respond in such an environment, I spoke to internal combustion engine testing specialist, MAHLE Powertrain.


RDE WITHIN THE REGULATORY FRAMEWORK One of the key things the industry has to demonstrate is that the results it produces relate to Real Driving Emissions (RDE) based on real on-road circumstances rather than a dynamometer. RDE testing underpins the entire transition from the existing New European Driving Cycle (NEDC) regulations to the harmonised World Light vehicle Test Procedure (WLTP) which is expected to replace NEDC entirely in the next decade.


❱❱ MAHLE Powertrain uses a dynamometer to perform RDE simulation testing


According to Simon Williams, Leader of RDE Development


at MAHLE Powertrain, there is a huge amount of change in the emission regulation requirement over the next 5 years which is creating challenges for the industry. “If we just consider the planned changes to EU emissions


regulations for light duty vehicles, we have the inclusion of RDE with EU6d, Temp and WLTP from the 1st September this year. Then we will still be using NEDC for the CO2 and fuel consumption measurement until 2020,” he explained. From 2021, the framework will switch completely to WLTP


but even then, the results will be correlated back to an NEDC value using the post processing “CO2mpas” tool. The CO2mpas tool was developed to enable the industry (and consumers) to have a benchmark against which they could compare test results whilst the goal posts are on the move. The ability to compare CO2 results between WLTP and NEDC also meant that all the NEDC based targets that were set for the industry didn’t need to be changed to match the WLTP regulation, which is even now still in the draft stage.


CATERING FOR CLIMATE With the new regulations coming into force as soon as this September for new types of vehicles, understanding what needs to be done to test against for real driving emissions is something of a challenge. According to Williams, this is


GLOSSARY


RDE – Real Driving Emissions NEDC – New European Driving Cycle UDC – Urban Driving Cycle EUDC – Extra-Urban Driving Cycle WLTP – World Harmonised Light Vehicle Test Procedure PEMS – Portable Emissions Measurement System


Climatic & Vibration Testing 2017 /// 7


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24