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Solutionskatalog2016_EN

AVL STS PLU 131 Urea / 148 SIMULATION SOLUTIONS TEST SYSTEM SOLUTIONS Electrification Battery Test Systems E-Motor Test Systems Power Electronics Test Systems Component Test Systems MBD on the virtual testbed Engine Test Systems End of Line Test Systems Real Life Test Systems Driveline Test Systems Fuel and Lube Test Systems Emission Test Systems and Certification Vehicle Test Systems Racing Test Systems TESTING EQUIPMENT Dynamometers and Actuators Vehicle Testbeds Test Cell Mechanics and Control Rooms Media Conditioning Consumption Measurement Injection Testing Combustion Measurement Emission Analysis and Measurement In Vehicle Measurement TESTING EQUIPMENT SIMULATION TOOLS TESTING TOOLS CUSTOMER SERVICES The development and production of SCR injection systems requires precise shot quantity measurement of the urea dosage in the exhaust gas system. In doing so, the characterization and testing of curves and functionality are implemented in an advantageous manner and under realistic conditions for both injectors and complete injection systems. MEASUREMENT PRINCIPLE Just like in low-pressure fuel injection, a precise consumption measure ment on the undisturbed SCR system can only be implemented at the feed side (upstream) of the injector. The most important difference compared to fuel is the extremely low level of urea consumption, which amounts to only five percent of diesel consumption. With these extreme requirements, the AVL Shot-to-Shot™ PLU 131 is the only flow measurement system that also satisfies the requirements for measurement accuracy. This is achieved through the dual PLU measurement principle with two complementing sensors for dynamics and injection quantities. APPLICATION To measure the minimal quantities of urea injectors, component testbeds for SCR system development comply with stringent requirements on stability of pressure and temperature conditions as well as the precision of flow measurement. This is the only way to ensure actual injector properties are characterized without interference from error sources. The high level of measurement accuracy at extremely low flow rates as low as 0.01 l/h is also the reason AVL Shot-to-Shot™ PLU 131 Urea has been the only approved means of measurement in the production system of the world market leader for SCR systems since 2006. BENEFITS AT A GLANCE • Relevant results: application on high-pressure side of injector (upstream) for shot quantity measurement on low-pressure injectors • Development safety: high level of measurement accuracy on a broad measurement range with minimal influence on the system • Production quality: fast and precise measurements at the full range of operating parameters when testing injectors with the 100 % test UREA INJECTION QUANTITY MEASUREMENT Urea Upstream Injection Quantity Measurement: Injection quantity statistics over 30 injections of an injector characteristic test down to extremely low flow rates of 10 g/h Urea Injection Quantity Measurement Cycle # Rail Pressure bar Injection Quantity mm3/str 4,64 4,56 4,48 4,40 4,32 4,24 4,16 4,08 4,00 3,92 3,84 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 4,52 4,51 4,50 4,49 4,48 4,47 Engine Speed rpm 60.0 - - Mean Std Dev CoV% bar 4.48 0.00047 0.011 mm3/str 4.26 0.02 0.55 mg/s 4.63 0.05 1.03 Rail pressure Inj Qty Q1_cal Inj Qty Q_kd


Solutionskatalog2016_EN
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