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TECHNICAL PAPERS

Control-Oriented Model for Camless Intake Process—Part I

[+] Author and Article Information
M.-S. S. Ashhab, A. G. Stefanopoulou

Mechanical and Environmental Engineering Department, University of California, Santa Barbara, CA 93106

J. A. Cook, M. B. Levin

Ford Motor Company, Scientific Research Laboratory, Dearborn, MI 48121

J. Dyn. Sys., Meas., Control 122(1), 122-130 (Jul 14, 1998) (9 pages) doi:10.1115/1.482447 History: Received July 14, 1998
Copyright © 2000 by ASME
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References

Elrod, A. C., and Nelson, M. T., 1986, “Development of a Variable Valve Timing Engine to Eliminate the Pumping Losses Associated with Throttled Operation,” SAE Paper No. 860537.
Gray, C., 1988, “A Review of Variable Engine Valve Timing,” SAE Paper No. 880386.
Ma, T. H., 1986, 1996, “Recent Advances in Variable Valve Timing,” Alternative and Advanced Automotive Engines, Plenum Press, New York.
Schecter, M. M., and Levin, M. B., 1996, “Camless engine,” SAE Paper No. 960581.
Meacham, G.-B., 1970, “Variable Cam Timing as an Emission Control Tool,” SAE Paper No. 700645.
Moriya, Y., Watanabe, A., Uda, H., Kawamura, H., Yoshioka, M., and Adachi, M. 1996, “A Newly Developed Intelligent Valve Timing System—Continuously Controlled Cam Phasing as Applied to A New 3 Liter Inline 6 Engine,” SAE Paper No. 960579.
Anderson, M., Tsao, T.-C., and Levin, M., 1998, “Adaptive Lift Control for a Camless Electrohydraulic Valvetrain,” SAE Paper No. 981029.
Kim, D., Anderson, M., Tsao, T.-C., and Levin, M. 1997, “A Dynamic Model of a Springless Electrohydraulic Camless Valvetrain System,” SAE Paper No. 970248.
Ahmad, T., and Theobald, M. A., 1989, “A Survey of Variable Valve Actuation Technology,” SAE Paper No. 891674.
Sono, H., and Umiyama, H. 1994, “A Study of Combustion Stability of Non-Throttling Sl Engine with Early Intake Valve Closing Mechanism,” SAE Paper No. 945009.
Ashhab, M. S., Stefanopoulou, A. G., Cook, J. A., and Levin, M., “Camless Engine Control for Robust Unthrottled Operation,” SAE Paper No. 981031.
Urata, Y., Umiyama, H., Shimizu, K., Fujiyoshi, Y., Sono, H., and Fukuo, K., “A Study of Vehicle Equipped with Non-Throttling SI Engine with Early Intake Valve Closing,” SAE Paper No. 930820.
Moraal, P. E., Cook, J. A., and Grizzle, J. W., 1995, “Modeling the Induction Process of an Automobile Engine,” Control Problems in Industry, I. Lasiecka and B. Morton, ed., Birkhauser, Basel, pp. 253–270.
Powell, B. K., and Cook, J. A. 1987, “Nonlinear Low Frequency Phenomenological Engine Modeling and Analysis,” Proc. 1987 Amer. Contr. Conf. 1 , pp. 332–340, June.
Heywood, J. B., 1988, Internal Combustion Engine Fundamentals, McGraw-Hill, New York, NY.
Broome, D., 1969, “Induction Ram: Part I, II, III,” Automobile Engineer, Apr., May, June.
Ohata, A., and Ishida, Y., 1982, “Dynamic Inlet Pressure and Volumetric Efficiency of Four Cylinder Engine,” SAE Paper No. 820407.
Novak, J. M., 1977, “Simulation of the Breathing Process and Air-Fuel Ratio Distribution Characteristics of Three-Valve, Stratified Charge Engines,” SAE Paper No. 770881.
Shampine,  L. F., and Gear,  C. W., 1979, “A User’s View of Solving Stiff Differential Equations,” SIAM Rev., 21, No. 1, pp. 1–17.
Miller, R. H., Davis, G. C., Newman, C. E., and Levin, M. B., 1997, “Unthrottled Camless Valvetrain Strategy for Spark-Ignited Engines,” Proc. ASME ICE 29-1 , pp. 81–94.

Figures

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Model (dashed line) versus experimental data (solid line) at 3000 rpm
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Model (dashed line) versus experimental data (solid line) at 4000 rpm
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Camless valvetrain controller (“inner loop”) and camless engine controller (“outer loop”)
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Electro-hydraulic camless (dashed), simplified camless (solid), and conventional (dotted) intake valve profiles
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Intake valve profiles for different speeds
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Engine breathing characteristics of a 4-cylinder engine at an engine speed of 1500 rpm
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Cylinder P-V diagrams that demonstrate the pumping loss in a throttled and a camless unthrottled engine (lift profiles are also shown)
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Model (dashed line) versus experimental data (solid line) at 1500 rpm
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Mean-value pumping losses
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Investigation of the effects of the higher order inertial and acoustic dynamics to the mean-value model at an engine speed of 1500 rpm
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Investigation of the effects of the higher order inertial and acoustic dynamics to the mean-value model at an engine speed of 6000 rpm
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P-V diagram with and without Helmholtz dynamics at an engine speed of 6000 rpm. The intake valve closing timings are early (IVC=80 deg), at the event (IVC=180 deg), and late (IVC=230 deg) in the top, middle, and bottom subplots, respectively.
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The performance variables dependence on engine speed for the simplified and higher order intake valve motions: IVO=0 deg,IVL=7 mm, and IVC=180 deg
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Mean-value cylinder air charge

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