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Monitoring the Hydraulic Conditions in Automotive Injection Systems Using Robust Flow Sensors

  • For a further optimization of the automotive power train of diesel engines, advanced combustion processes require a highly flexible injection system, provided e.g., by the Common Rail (CR) injection technique. In the past, the feasibility to implement in the injection nozzle injection quantity sensors based on a thermo-resistive measurement principle has been demonstrated up to injection pressures of 135 MPa (1350 bar). Due to a very complex integration procedure a less-costly implementation is realized in the range of the high-pressure pipe connecting each single injector with the common pressure reservoir. The sensor output signals measured at this location of the hydraulic system are compared to those obtained from the nozzle as well as from an injection amount indicator used as standard reference method. Finally, hydraulic simulations on system level are performed showing a good correspondence in respect to the onset of fuel flow and to the period of pressure oscillations generated in the hydraulic system after termination of theFor a further optimization of the automotive power train of diesel engines, advanced combustion processes require a highly flexible injection system, provided e.g., by the Common Rail (CR) injection technique. In the past, the feasibility to implement in the injection nozzle injection quantity sensors based on a thermo-resistive measurement principle has been demonstrated up to injection pressures of 135 MPa (1350 bar). Due to a very complex integration procedure a less-costly implementation is realized in the range of the high-pressure pipe connecting each single injector with the common pressure reservoir. The sensor output signals measured at this location of the hydraulic system are compared to those obtained from the nozzle as well as from an injection amount indicator used as standard reference method. Finally, hydraulic simulations on system level are performed showing a good correspondence in respect to the onset of fuel flow and to the period of pressure oscillations generated in the hydraulic system after termination of the drive pulse.show moreshow less

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Metadaten
Author:Ulrich Schmid, Gerhard Krötz
DOI:https://doi.org/10.1166/sl.2008.m161
Identifier:1546-1971 OPAC HS OPAC extern
Identifier:1546-198X OPAC HS OPAC extern
Parent Title (English):Sensor Letters
Publisher:American Scientific Publishers (ASP)
Place of publication:Stevenson Ranch, Calif.
Document Type:Article
Language:English
Date of Publication (online):2008/10/01
Tag:Common - Rail (Cr) Injection System; Hydraulic Simulations
High - Pressure Pipe; Injection Nozzle; Injection Quantity Sensor; Ltcc Substrate; Platinum Thin Film
Volume:6
Issue:5
Number of pages:7 Seiten
First Page:771
Last Page:777
Institutes:Fakultät Maschinenbau
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften
Publication reviewed:begutachtet
Release Date:2020/08/18
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