/ 117 AVL Blow by Meter BENEFITS AT A GLANCE • The accuracy of 1 % FSO (optional) and the reproducibility of 0.1 % comply with the high 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 inverted blow-by flows • Simple integration and installation on the testbed BLOW BY MEASUREMENT Nowadays, blow-by measurement is standard on engine testbeds. In order to be able to comply with the exhaust gas legislation for new combustion engines today and in the future, the requirements for crankcase ventilation systems will continue to increase. In order to design such systems, knowledge of the blow-by map of the engine is also required. This and the possibility of continuous measurement of the blow-by flow to monitor the engine condition make the AVL Blow By Meter an indispensable instrumentation device for engine testing. MEASUREMENT PRINCIPLE In order to determine the blow-by flow, the orifice measurement principle (differential pressure measurement procedure) is used. A neck (orifice) in the tube cross-section results in a pressure drop that is measured by means of a differential pressure sensor. The shape of the orifice of the AVL Blow By Meter was selected in a manner that ensures accuracy in both flow directions while also preventing accumulations at the blind that would modify the cross-section. The selected shape of the orifice allows a broad 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 up to ships’ diesel engines. The areas of application cover engine research and optimization of the piston cylinder assembly. Furthermore, this system is used when designing crankcase ventilation systems and on quality and endurance testbeds. Differential pressure sensor Orifice Principle p Available online via AVL ePRODUCTS https://shop.avl.com
Solutionskatalog2014_E
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