Establishment of The Lower Limit of Particulate Mass Measurements For The Purpose of Type Approval of Light-Duty Vehicles

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1 BACKGROUND INFORMATION

The European Commission has started work to prepare a proposal for the next stage of the vehicle emission standards for light-duty vehicles, regulated by Directive 98/69/EC, the so-called EURO 5 standards. One key issue is the emission of particulate matter (PM), notably from diesel engines. On 18th February 2004 the Commission has sent a questionnaire to the stakeholders in the Motor Vehicle Emissions Group (MVEG) asking for information on the technological solutions for certain scenarios on possible emission limit values. These scenarios vary in their ambition as regards pollutant emissions.

In connection with the limit values for PM emissions, it is recognised that some existing technologies can reduce the level of PM emissions to very low levels. Correspondingly, one of the scenarios has been set at a PM emission level of 2.5mg/km which is 90% below the Euro 4 limit. The question has been raised whether such an emission level can be reliably measured, and indeed what is the lower limit of measurability with the present set-up of PM mass measurements for the purpose of type approval?


2 OBJECTIVES

The objectives of this Administrative Arrangement are
1. to verify the measurability of the PM emission limit value contained in scenarios 1 CI and 2 CI of the EURO 5 questionnaire (2.5 mg/km for Class I, 4 mg/km for Class II and 6 mg/km for Class III vehicles) sent by the Commission to stakeholders on 18th February 2004.
2. to evaluate the measurability of particulate matter emissions from light-duty vehicles at very low emission levels for the purpose of type approval under the current legislative boundary conditions.

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