Abstract:

On-board measurement (OBM) of vehicles in use will play an important role for future identification of high emitting heavy-duty vehicles in operation both in Europe and US. Verification of emission performance of light duty vehicles (LDV, passenger cars, light duty trucks) has since many years been carried out by testing vehicles on a chassis dynamometer. For Heavy Duty Vehicles (HDV) this procedure has not been suitable, since emission regulation concerns the engine itself - and not the vehicle - and there has also been limited number of chassis dynamometers available.

Lately, the European regulation has opened up for in-use compliance testing of HDV in the same manner as for LDV, however without specifying the test method. Projects have been started both in Europe and USA to develop new test methods for validation of emission performance from HDV. Within the European DG ENTR project PEMS (Portable Emission Measurement System), Sweden will during year 2006 start to measure HDV by the use of OBM.

Initial part of the project was to establish correlation between chassis dynamometer testing and OBM to find out the relevance of the method and to identify whether the method was good enough to identify high emitters. This was carried out by testing vehicles with different emission performance.

Future method of applications for OBM is not restricted to find high emitters but could probably also be used for development of local emission factors and to measure emissions from locomotives and off-road applications. In Asia the number of chassis dynamometers for HDV is limited and therefore OBM could play a significant role for measurement of emissions. This could support the development of emission- factors and inventories.

Presentation: http://www.cleanairnet.org/baq2006/1757/docs/SW27_1.ppt