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Front. Mech. Eng. | doi: 10.3389/fmech.2018.00002

Utilizing Production Viable Valve Strategies at Elevated Speeds and Loads to Improve Volumetric Efficiency via Intake Valve Modulation

  • 1Purdue University, United States
  • 2Eaton, United States
  • 3Cummins (United States), United States

Valvetrain flexibility enables the optimization of the engine’s ability to breathe across the operating range, resulting in more efficient operation. The authors have shown the merit of improving volumetric efficiency via valvetrain flexibility to improve fuel efficiency at elevated engine speeds in previous work. This study focuses on production viable solutions targeting similar volumetric efficiency benefits via delayed intake valve closure at these elevated engine speeds. Specifically, the production viable solutions include reducing the duration at peak lift, as well as reducing the amount of hardware required to achieve a delayed intake closure timing. It is demonstrated through simulation that delayed intake valve modulation at an elevated speed (2200 RPM) and load (12.7 bar BMEP) is capable of improving volumetric efficiency via a production viable lost motion enabled boot profile shape. Phased and dwell profiles were also evaluated. These profiles were compared against each other for two separately simulated cases: 1) modulating both intake valves per cylinder, and 2) modulating one of the two intake valves per cylinder. The boot, phase, and dwell profiles demonstrate volumetric efficiency improvements of up to 3.33%, 3.41%, and 3.5% respectively for two valve modulation, while realizing 2.79%, 2.59%, and 3.01% respectively for single valve modulation. As a result, this paper demonstrates that nearly all of the volumetric efficiency benefits achieved while modulating IVC via dwell profiles are possible with production viable boot and phased profiles

Keywords: diesel engines, Efficiency, production viable, Valvetrain, Volumetric efficiency

Received: 09 Oct 2017; Accepted: 26 Jan 2018.

Edited by:

Evangelos G. Giakoumis, National Technical Univ. of Athens, Greece

Reviewed by:

George Kosmadakis, Agricultural University of Athens, Greece
Efthimios G. Pariotis, Hellenic Naval Academy, Greece  

Copyright: © 2018 Vos, Shaver, McCarthy and Farrell. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Gregory Shaver, Purdue University, West Lafayette, United States, gshaver@purdue.edu