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Technical Briefs

Analytical and Experimental Assessment of Some Novel Variable-Valve-Actuation Mechanisms

[+] Author and Article Information
Burak Gecim1

Propulsion Systems Research Laboratories, GM R&D Center, Warren, MI 48090-9055

Madhusudan Raghavan

Propulsion Systems Research Laboratories, GM R&D Center, Warren, MI 48090-9055

1

Formerly at GM.

J. Mechanisms Robotics 2(2), 024503 (Apr 19, 2010) (5 pages) doi:10.1115/1.4001098 History: Received December 20, 2008; Revised December 11, 2009; Published April 19, 2010; Online April 19, 2010

We describe our analytical and experimental works on three novel variable valve actuation systems. These include a mechanical variable-lift and duration concept, a hydraulic-lost-motion variable-lift system, and a valve-deactivation mechanism with unique features. These devices differ in their complexity and versatility but offer a spectrum of design solutions applicable to a range of products. The strengths and weaknesses of these different approaches are discussed and analyzed, and some test results are presented.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Mechanical variable lift and phasing

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Figure 2

Linkage kinematics

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Figure 3

Variable lift and phasing

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Figure 4

Hydraulic-lost-motion test fixture

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Figure 5

Measured lift (mm) versus time (s) with mechanical-stop lost-motion control

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Figure 6

Comparison of measured energy loss with two different types of lost-motion control

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Figure 7

Hydraulic-lost-motion test fixture employing a roller-finger-follower

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Figure 8

Measured valve lift at 400 rev/min camshaft speed

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Figure 9

Measured valve lift at 1250 rev/min camshaft speed

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Figure 10

Energy-loss comparison between a flat- and a roller-finger-follower arrangement

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Figure 11

Packaging a switching SHLA

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Figure 12

Active lash adjuster enabling variable valve lift

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Figure 13

Test fixture for evaluating active lash adjusters

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Figure 14

A switching SHLA employing flat collars as the locking elements

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