Abstract
The partial flow dilution tunnel system is one of the most typical systems to measure the particulate matter emission from diesel engines. This system requires to lead the exhaust gas to the tunnel at a constant split ratio, and to confirm the uniformity of the split ratio during test. Due to lack of real time measurement procedure of exhaust gas flow in transient condition, partial flow dilution system is currently applied only to steady-state engine operating conditions. This paper describes a vortex exhaust gas flow meter with resonator developed to realize the direct flow rate measurement in transient engine operating conditions. Results of the several scheduled driving tests defined for emission test lead that the developed gas flow meter system has enough accuracy in measuring the exhaust gas flow rate in transient conditions.
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