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Design impacts on CVS systems meeting future requirements for equivalent zero emissions vehicles
Technical Paper
2000-05-0347
Sector:
Language:
English
Abstract
The latest legislation requires a dramatic reduction of motor
vehicle exhaust emission. This is also a big challenge for emission
measurement instrumentation, because of almost zero concentrations
of certain components in the exhaust. For current measurement
devices, which are recommended by the legislation, it is almost
impossible to determine such low emission levels with adequate
accuracy.
The paper describes a new Constant Volume Sampling (CVS) system
with reduced dilution, warming and quick flow rate changing
capability. Possible solutions are discussed and the properties of
data measured with test facilities which are prepared to cover
S-ULEV and EURO IV applications are described. Also the selection
of used materials is of rising importance. The tests were performed
on a dynamic engine test bed which was equipped with such a CVS
system and with emission analyzing systems for raw exhaust and
diluted measurements.
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