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Increasing the Delivery Pressure of High-Pressure Gasoline Pumps for Direct Injection Engines by the Use of Ceramic Components

Increasing the Delivery Pressure of High-Pressure Gasoline Pumps for Direct Injection Engines by the Use of Ceramic Components

          
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About the Book

English summary: The fuel consumption of modern combustion engines can be significantly reduced through the use of gasoline direct injection (GDI). As the time for mixture preparation in GDI engines is very short, the fuel has to be injected at high pressure into the combustion chamber. Modern injection systems provide an injection pressure of up to 20 MPa, whereas investigations performed at the Karlsruhe Institute of Technology have shown strong potential for reduced pollutant emissions by increasing the pressure to 80 MPa. However, the low lubricity of gasoline causes sever friction and wear in the high-pressure pump at fuel pressures above 20 MPa. The use of ceramic components in the sliding systems should help to overcome this limitation. A 3-piston radial pump based on ceramic sliding systems that delivers fuel at up to 80 MPa has been designed at Karlsruhe Institute of Technology. The prototype is based on the knowledge accumulated during former investigations performed on a single-piston pump. It is fitted with pressure and temperature sensors in each cylinder and a torque sensor on the driveshaft in order to measure its efficiency with various material combinations in its sliding systems. The results show that the use of ceramic material such as silicon carbide or sialon enable operation at injection pressures of up to 80 MPa with very good mechanical efficiency and low wear. German description: Im vorliegenden Band 4/2013 berichtet Herr Pfister uber experimentelle Untersuchungenzur Realisierung von Forderdrucken bis 800 bar durch die Nutzung vonkeramischen Komponenten in einer Hochdruckpumpe fur die Direkteinspritzungvon Benzin. Dieses Druckniveau ermoglicht eine schnellere Gemischbildung in Verbrennungsmotorenbei direkter Kraftstoffeinspritzung, und damit eine bessere Ausnutzungdes Potenzials dieser Technologie. Neben grundlegenden tribologischenUntersuchungen von Reibungszahlen mit verschiedenen Materialpaarungen in denGleitsystemen werden Ergebnisse von Effienzmessungen vorgestellt. Die Analyseder beanspruchten Oberflachen ist von besonderem Interesse, in dem sie wichtigeInformationen uber die Reibungs- und Verschleissmechanismen liefert. ZyklischeSchwankungen und Larmemissionen mit verschiedenen Werkstoffpaarungen werdendurch eine Spektralanalyse der Verlaufe von Antriebsmomenten charakterisiert. Die Ergebnisse aus der vorliegenden Arbeit zeigen, dass die Nutzung ingenieurkeramischerWerkstoffe in den Gleitsystemen der Benzin-Hochdruckpumpeeine deutliche Steigerung des Forderdrucks erlaubt. Dadurch konnen auch dieVorteile der Benzin-Direkteinspritzung besser ausgenutzt werden, da hohere Einspritzdrucke zu signifikant geringeren Schadstoffemissionen fuhren. Dies konntebereits in Untersuchungen zur Benzin-Direkteinspritzung mit Einspritzdrucken imBereich bis zu 1000 bar mit Reduzierungen von bis zu 99 % bei den Rohemissionenvon Russpartikeln nachgewiesen werden.


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Product Details
  • ISBN-13: 9783832534820
  • Publisher: Logos Verlag Berlin
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 0 mm
  • Width: 169 mm
  • ISBN-10: 3832534822
  • Publisher Date: 24 Sep 2013
  • Height: 240 mm
  • No of Pages: 147
  • Series Title: Forschungsberichte Aus Dem Institut Fur Kolbenmaschinen
  • Weight: 700 gr


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Increasing the Delivery Pressure of High-Pressure Gasoline Pumps for Direct Injection Engines by the Use of Ceramic Components
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