A model-based control scheme is designed to regulate the cylinder air charge of a camless multicylinder engine for unthrottled operation. The controller consists of a feedforward and an adaptive feedback scheme based on a control-oriented model of the breathing process of an engine equipped with electro-hydraulic springless valvetrain. The nonlinear control scheme is designed to achieve cylinder-to-cylinder balancing, fast cycle-to-cycle response, and minimization of pumping losses. The algorithm uses conventional sensor measurements of intake manifold pressure and mass air flow to the intake manifold, and intake valve duration measurement. Closed-loop simulation results are shown for a four-cylinder engine. [S0022-0434(00)03001-X]

Ashhab, M. S., Stefanopoulou, A. G., Cook, J. A., and Levin, M., 1998, “Camless Engine Control for Robust Unthrottled Operation,” SAE Paper No. 981031.
Urata, Y., Umiyama, H., Shimizu, K., Fujiyoshi, Y., Sono, H., and Fukuo, K., 1993, “A Study of Vehicle Equipped with Non-Throttling SI Engine with Early Intake Valve Closing,” SAE Paper No. 930820.
Vogel, O., Rousssopoulos, K., Guzzella, L., and Czekai, J., 1996, “An Initial Study of Variable Valve Timing Implemented with a Secondary Valve in the Intake Runner,” SAE Paper No. 960590.
Schecter, M. M., and Levin, M. B., 1996, “Camless Engine,” SAE Paper No. 960581.
Astrom, K., and Wittenmark, B., 1989, Adaptive Control, Addison-Wesley, Reading, MA.
You do not currently have access to this content.