Control-Oriented Model for Camless Intake Process—Part I

M.-S. S. Ashhab; A. G. Stefanopoulou; J. A. Cook; M. B. Levin

doi:10.1115/1.482447

Journal of Dynamic Systems, Measurement, and Control | Volume 122 | Issue 1 | TECHNICAL PAPERS

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TECHNICAL PAPERS

Control-Oriented Model for Camless Intake Process—Part I

M.-S. S. Ashhab, A. G. Stefanopoulou, J. A. Cook and M. B. Levin

[+] 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

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Figures

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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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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Ashhab MS, Stefanopoulou AG, Cook JA, Levin MB. Control-Oriented Model for Camless Intake Process—Part I. ASME. J. Dyn. Sys., Meas., Control. 1998;122(1):122-130. doi:10.1115/1.482447.

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Control-Oriented Model for Camless Intake Process—Part I

References

Figures

Camless valvetrain controller (“inner loop”) and camless engine controller (“outer loop”)

Electro-hydraulic camless (dashed), simplified camless (solid), and conventional (dotted) intake valve profiles

Intake valve profiles for different speeds

Engine breathing characteristics of a 4-cylinder engine at an engine speed of 1500 rpm

Cylinder P-V diagrams that demonstrate the pumping loss in a throttled and a camless unthrottled engine (lift profiles are also shown)

Model (dashed line) versus experimental data (solid line) at 1500 rpm

Model (dashed line) versus experimental data (solid line) at 3000 rpm

Model (dashed line) versus experimental data (solid line) at 4000 rpm

Mean-value cylinder air charge

Mean-value pumping losses

Investigation of the effects of the higher order inertial and acoustic dynamics to the mean-value model at an engine speed of 1500 rpm

Investigation of the effects of the higher order inertial and acoustic dynamics to the mean-value model at an engine speed of 6000 rpm

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.

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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