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Research Papers

A Dynamic Model of an Electropneumatic Valve Actuator for Internal Combustion Engines

[+] Author and Article Information
Jia Ma

 Delphi Powertrain Systems, Auburn Hill, MI 48326jia.ma@delphi.com

Guoming G. Zhu

 Michigan State University, East Lansing, MI 48824zhug@egr.msu.edu

Harold Schock

 Michigan State University, East Lansing, MI 48824schock@egr.msu.edu

J. Dyn. Sys., Meas., Control 132(2), 021007 (Feb 03, 2010) (10 pages) doi:10.1115/1.4000816 History: Received November 15, 2008; Revised November 20, 2009; Published February 03, 2010; Online February 03, 2010

This paper presents a detailed model of a novel electropneumatic valve actuator for both engine intake and exhaust valves. The valve actuator’s main function is to provide variable valve timing and variable lift capabilities in an internal combustion engine. The pneumatic actuation is used to open the valve and the hydraulic latch mechanism is used to hold the valve open and to reduce valve seating velocity. This combination of pneumatic and hydraulic mechanisms allows the system to operate under low pressure with an energy saving mode. It extracts the full pneumatic energy to open the valve and use the hydraulic latch that consumes almost no energy to hold the valve open. A system dynamics analysis is provided and followed by mathematical modeling. This dynamic model is based on Newton’s law, mass conservation, and thermodynamic principles. The air compressibility and liquid compressibility in the hydraulic latch are modeled, and the discontinuous nonlinearity of the compressible flow due to choking is carefully considered. Provision is made for the nonlinear motion of the mechanical components due to the physical constraints. Validation experiments were performed on a Ford 4.6 l four-valve V8 engine head with different air supply pressures and different solenoid pulse inputs. The simulation responses agreed with the experimental results at different engine speeds and supply air pressures.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

System dynamics at the air charging stage

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Figure 2

System dynamics at the expansion and dwell stage

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Figure 3

System dynamics at the air discharging stage

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Figure 4

Actuator piston model

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Figure 5

Hydraulic latch/damper model

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Figure 6

Valve lift profile with the solenoid action chart

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Figure 7

Inlet port valve model

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Figure 8

Outlet port valve model

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Figure 9

Spool valve model

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Figure 11

Plots with 30 psi supply pressure and 30% duty cycle

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Figure 12

Plots with 40 psi supply pressure and 30% duty cycle

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Figure 13

Plots with 40 psi supply pressure and 25% duty cycle

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