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Research Papers

An Optimum Flexible Linkage Design of a Fully Variable Electromechanical Valve Actuation System for Internal Combustion Engines

[+] Author and Article Information
D. T. Hossein Rokni

School of Engineering,  University of British Columbia Okanagan, Kelowna, BC V1V 1V7, Canadahossein.rokni@ubc.ca

Rudolf J. Seethaler1

School of Engineering,  University of British Columbia Okanagan, Kelowna, BC V1V 1V7, Canadarudolf.seethaler@ubc.ca

Abbas S. Milani

School of Engineering,  University of British Columbia Okanagan, Kelowna, BC V1V 1V7, Canadaabbas.milani@ubc.ca

1

Corresponding author.

J. Mech. Des 133(12), 121008 (Dec 09, 2011) (9 pages) doi:10.1115/1.4005328 History: Received December 07, 2010; Revised October 05, 2011; Published December 09, 2011; Online December 09, 2011

In this study, the mechanical design of a fully flexible valve actuation system (FFVA) for intake valves of naturally aspirated internal combustion engines is optimized. The original FFVA design used a connecting rod in order to transform the rotating motion of the actuator to translating motion of the valve. In the improved design introduced here, the connecting rod is replaced by a flexible linkage. This step is taken in order to eliminate wear and play in the mechanical connections. A detailed design procedure is presented to optimize the heavy fatigue load on this element. Simulations and experimental tests are carried out in order to validate the system performance. It is shown that valve trajectory and energy consumption of the actuation system obtained by simulations are consistent with those observed experimentally. The present redesigned FFVA system then provides more reliable valve motion than previously shown designs.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

FFVA system structure [24]

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Figure 2

(a) Original pin-pin design; (b) Improved fixed-pin design; (c) new fixed-fixed design

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Figure 3

(a) Schematic of the geometry of a deflected clamped beam subjected to end forces; (b) free body diagram

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Figure 4

Critical λ for θ = 10 deg

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Figure 5

Behavior of y(x) versus x for different axial loads

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Figure 6

Axial change in connecting rod length

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Figure 7

Axial deflection of the connecting rod

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Figure 8

Coupled oscillator model

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Figure 9

Stresses for θ = 10 deg

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Figure 10

Maximum height and minimum width of the connecting rod for the desired design stress and bucking load

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Figure 11

Static torque versus length of the connecting rod for θ = 10 deg

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Figure 12

Natural frequency versus length of the connecting rod for an axial force of 80 N

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Figure 13

Experimental test bed

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Figure 14

Experimental and simulated responses of the valve closing process

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Figure 15

Current and ohmic energy loss of the valve closing process

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