自動車排ガス流量測定のための高温用超音波流量計の開発(エンジンの新しい計測技術とモデリング(3),エンジンの新しい計測技術とモデリング)

概要

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A new test mode which includes transient mode operation of engines is considered to be necessary at the pattern approval test for the recent regulation, considering actual driving pattern of a diesel vehicle in a city, which frequently accelerates and decelerates at various traffic conditions. The flowrate of exhaust gas can be estimated from the flowrates of air and fuel into the engine for the steady test mode. However, as a result of adopting the transient mode operation, the direct measurement of the exhaust gas flowrate is needed to divide the exhaust gas at a constant ratio into the dilution tunnel. The purposes of the present study are to develop the ultrasonic flowmeter measuring directly the exhaust gas flowrate. Several types of ultrasonic sensors taking account of both heat resistance and heat radiation are fabricated, and temperature effect on these sensor is experimentally examined.
2004-09-04