Abstract
We are the first to report about a micromachined mass flow sensor directly integrated in a Common Rail (CR) injection nozzle between the double guidance and the needle seat. This enables to study time-resolved and in detail important processes as pressure waves occurring during and after the injection at a place, where the injection rate is strongly influenced. Therefore, “on-board” mass flow sensors, enabling a closed-loop control of every magnetic or piezoelectric driven valve, could help to soften the tolerances of the mechanical parts in the injection system and hence, could substantially lower the production costs of the latter. The thermal measurement principle is chosen, because it enables a very precise and fast detection of gaseous and liquid mass flows. Additionally, the velocity field in the nozzle is only slightly influenced by the integration of the sensor in the nozzle body due to the negligible height of the sensitive layer. Also the outer geometry of the nozzle is not affected by the integration of the sensor, to guarantee that the cylinder head of the combustion chamber can keep its original design as far as possible. For hot film anemometers, a high temperature as well as a high pressure stable glass-ceramic substrate can be used, fabricated in a low cost batch process. The technology, to fabricate the sensor as well as its electrical characterisation up to 300°C on the ceramic substrate is presented. Finally, the first flow measurements at 600 bar, carried out at a high pressure hydraulic test bench, are discussed.
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References
K. Krieger, “ Diesel-Einspritztechnik für Pkw-Motoren”, MTZ 60, Nr. 5, 1999.
C. Stan (Hrsg.), “Direkteinspritzsysteme für Otto-und Dieselmotoren”, Springer Press, ISBN: 3-540-65287-6,1999.
F. Anisits, K. Borgmann, H. Kratochwill and F. Steinparzer, “Der neue BMW Sechszylinder Dieselmotor”, MTZ 59, Nr. 11, 1998.
K. H. Hoffmann, K. Hummel, T. Maderstein and A. Peters, “Das Common-Rail Einspritzsystem-Ein neues Kapitel der Dieseleinspritztechnik”, MTZ 58, Nr. 10, 1997.
G. Maiorana, G. R. Sebatiano and C. Ugaglia, “Die Common-Rail-Motoren von Fiat”, MTZ 59, Nr. 9, 1998.
H.G. Niefer, J. Frey, G. Karl and S. Krämer, “The DI-Gasoline Engine: Quo vadis-where does the road lead?”, 20. Internationales Wiener Motorensymposium, 1999.
Mitsubishi GDI, mot 2/1997.
T. Iwasaki, H. Maehara, O. Berberig, K. Nottmayer and T. Kobayashi, “ Study of a Sensor for Fuel Injection Quantity”, SAE Paper 970533.
Y. Kanai,J. Mizuno, K. Nottmayer and T. Kobayashi, “Micromachined Flow Sensor for Fuel Injection”, SAE World Congress, No.: 2000-01-1365, 2000.
K. W. Bonfig, “Durchflußmessung von Flüssigkeiten und Gasen”, Expert Press, ISBN: 3-8169-0654-0, 1990.
L. V. King, “On the convection of heat from small cylinders in a stream of fluid: Determination of the convection constants of small platinum wires, with application to hot wire anemometry”, Proc. Roy. Soc.,90, pp. 563–570,1914.
K. M. Foreman, “ Some operational characteristics of hot film water velocity sensors”, Proc. Symp. on Flow, pp. 623–629, Pittsburgh, 1971.
VDI Wär meatlas, “Berechnungsblätter für den Wärmeübergang”, 7. Auflage, ISBN: 3-18-401361-8, 1994.
Li Qiu, E. Obermeier and A. Schubert, “A microsensor with integrated heat sink and flow guide for gas flow sensing applications”, Proc. of the Transducers, pp. 520–523, Sweden, 1995.
V. N. Kalashnikov and A. M. Kudin, “Calibration of hot-film probes in water and in polymer solutions”, DIS A Info., 14, pp. 15–18, 1973.
H. Eckelmann, “Hot wire and hot film measurements in oil”, DISA Info.,13, pp. 16–22,1972.
W. A. Vitriol and J. I. Steinberg, “Development of a low temperature cofired multilayer ceramic technology”, ISHM Proceedings, pp. 593–598,1983.
H. D. Kaiser, F. J. Pakulski and A. F. Schmekkenbecher, “A fabrication technique for multilayer ceramic modules”,Solid State Tech., pp. 35–40,1972.
Y. Shimada, K. Utsumi, M. Suzuki, H. Takamizawa, M. Nitta and S. Yano, “Low firing temperature multilayer glass-ceramic substrate”, ECC Proceedings, pp.314–320, 1983.
H. Kuchling, “Taschenbuch der Physik”, Fachbuchverlag Leipzig, 1996.
T. J. Coutts, “Electrical conduction in thin metal films”,Elsevier Scientific Publishing Company, 1974.
K. L. Chopra, “Thin film phenomena”, McGraw-Hill Book Company, 1969.
O. Fiedler, “Strömungs-u. Durchflußmeßtechnik”, Oldenbourg Press, ISBN: 3-486-22119-1,1992.
U. Tietze and Ch. Schenk, “Halbleiterschaltungstechnik”, Springer Press, ISBN: 3-540-56184-6,10. Auflage, 1993.
P. Freymuth, “Frequency response and electronic testing for constant-temperature hot-wire anemometers”, J. Phys. E.: Sci. Instr., 10, pp. 705–710,1977.
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Schmid, U., Krötz, G., Schmitt-Landsiedel, D. (2001). A Mass Flow Sensor for Fuel Injection Quantity Measurements in Dl-Systems. In: Krueger, S., Gessner, W. (eds) Advanced Microsystems for Automotive Applications 2001. VDI-Buch. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18253-2_13
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DOI: https://doi.org/10.1007/978-3-642-18253-2_13
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