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Benefits of hydraulic layout over driving system in piezo-injectors and proposal of a new-concept CR injector with an integrated Minirail

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  • Ferrari, A.
  • Mittica, A.
  • Spessa, E.

Abstract

The prediction capability of an advanced Common Rail (CR) piezoelectric injection-system mathematical model has been upgraded and applied to the analysis of transient flows inside injectors. The predicted time histories of the sac-, delivery- and control-chamber pressures, of the pilot- and needle-valve lifts, and of the mass flow-rates through the Z and A holes, as well as through the bypass, have been analyzed to explain the differences in performance between piezoelectric and solenoid injectors. The objective was to study the influence exerted by the different hydraulic and mechanical setups in order to assess the effective benefits that could be obtained from the replacement of the solenoid driving system with the piezoelectric one. Then, the upgraded mathematical model has been applied to the design of new-concept injectors. First, specific attention was given to the effects that variations in the peak current values could have on the injected flow-rate. Furthermore, numerical simulations were performed to comprehend the effects that remarkable increments in the injector internal accumulation volume could have on injection system performance. A prototype of the new-concept injector with a small integrated accumulator (Minirail) has also been tested on the hydraulic rig.

Suggested Citation

  • Ferrari, A. & Mittica, A. & Spessa, E., 2013. "Benefits of hydraulic layout over driving system in piezo-injectors and proposal of a new-concept CR injector with an integrated Minirail," Applied Energy, Elsevier, vol. 103(C), pages 243-255.
    • Handle: RePEc:eee:appene:v:103:y:2013:i:c:p:243-255
    DOI: 10.1016/j.apenergy.2012.09.039
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    References listed on IDEAS

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    1. Payri, R. & Salvador, F.J. & Gimeno, J. & De la Morena, J., 2011. "Influence of injector technology on injection and combustion development - Part 1: Hydraulic characterization," Applied Energy, Elsevier, vol. 88(4), pages 1068-1074, April.
    2. Ferrari, A. & Mittica, A., 2012. "FEM modeling of the piezoelectric driving system in the design of direct-acting diesel injectors," Applied Energy, Elsevier, vol. 99(C), pages 471-483.
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    Cited by:

    1. Plamondon, E. & Seers, P., 2014. "Development of a simplified dynamic model for a piezoelectric injector using multiple injection strategies with biodiesel/diesel-fuel blends," Applied Energy, Elsevier, vol. 131(C), pages 411-424.
    2. S., d'Ambrosio & A., Ferrari, 2018. "Diesel engines equipped with piezoelectric and solenoid injectors: hydraulic performance of the injectors and comparison of the emissions, noise and fuel consumption," Applied Energy, Elsevier, vol. 211(C), pages 1324-1342.
    3. Serrano, J. & Jiménez-Espadafor, F.J. & Lora, A. & Modesto-López, L. & Gañán-Calvo, A. & López-Serrano, J., 2019. "Experimental analysis of NOx reduction through water addition and comparison with exhaust gas recycling," Energy, Elsevier, vol. 168(C), pages 737-752.
    4. Magno, Agnese & Mancaruso, Ezio & Vaglieco, Bianca Maria, 2014. "Experimental investigation in an optically accessible diesel engine of a fouled piezoelectric injector," Energy, Elsevier, vol. 64(C), pages 842-852.
    5. Ferrari, Alessandro & Paolicelli, Federica & Pizzo, Pietro, 2015. "The new-generation of solenoid injectors equipped with pressure-balanced pilot valves for energy saving and dynamic response improvement," Applied Energy, Elsevier, vol. 151(C), pages 367-376.
    6. Ferrari, A. & Mittica, A., 2016. "Response of different injector typologies to dwell time variations and a hydraulic analysis of closely-coupled and continuous rate shaping injection schedules," Applied Energy, Elsevier, vol. 169(C), pages 899-911.

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