/ 141 ENGINE CRANKCASE VENTILATION FLOW MEASUREMENT AVL Blow by Meter that is measured by means of a differential pressure sensor. The shape of the orifi ce of the AVL Blow By Meter means that it, on the one hand, ensures the accuracy in ��oth �� ow directions and, on the other, prevents condensation at the orifi ce that might modify the cross-section. The selected shape of the orifi ce allows a ��road dynamic range of 1:50. APPLICATION On the basis of the interchangeable measurement ranges between 0.2 and 2,400 l/min, the AVL Blow by Meter can be used from small- scale and single-cylinder engines to ships’ diesel engines. The areas of application cover engine research and the optimization of the piston cylinder assembly. Furthermore, this system is used when designing crankcase ventilation systems and on quality and endurance testbeds. Blow-by measurement nowadays is standard on engine testbeds. To be able to comply with the emission legislation for new combustion engines today and in the future, the requirements for crankcase ventilation systems will continue to increase. In order to design these systems, knowledge of engine blow-by mapping is also required. This and the possibility of continuous measurement of the blow-by �� ow to monitor the engine condition make the AVL Blow By Meter an indispensable instrument for engine testing. MEASUREMENT PRINCIPLE For the determination of ��low-��y �� ow the orifi ce measurement principle (differential pressure measurement procedure) is used. A neck ��orifi ce�� in the tu��e cross-section provokes a pressure drop Differential pressure sensor Orifice Principle rp BENEFITS AT A GLANCE • The accuracy of 1 % FSO (optional) and the reproducibility of 0.1 % comply with the strict requirements of engine measurement technology • Due to the minimum pressure drop, the blow-by behavior of the engine is hardly affected • High reliability and constant measurement readiness are realized by low dirt sensitivity • Correct detection even of reverse ��low-��y �� ows • Simple integration and installation on the testbed
Solutionskatalog_2017_E
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