| MODEL-BASED CONTROL OF ELECTROMAGNETIC VALVE ACTUATORS FOR ENGINE SPEED CONTROL |
| Huitao Chen, Siqin Chang, Aimin Fan |
| Nanjing University of Science and Technology |
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| ABSTRACT |
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The introduction of electromagnetic valve actuators (EMVA) benefits engine fuel economy, torque
performance and reduction of emissions. Meanwhile, it complicates the controller for the purpose of regulating the additional
freedom degrees of intake valvetrain, such as valve lift, opening timing and opening duration. In order to address the control
issue of EMVA application, a model-based controller is needed to realize that the cylinder air charge is regulated by
controlling the EMVA motion directly for controlling the engine speed and output torque. For the development of the
controller, a control-oriented model of engine with EMVA that can simulate the intake process of unthrottled operation, torque
generation and crankshaft rotational dynamics was first developed. Then a model-based EMVA controller was designed to
regulate the actuation of electromagnetic intake valves which consisted of a feedforward and a PID feedback module.
According to torque-based concept, engine speed reference was translated into torque demand using optimal control theory
and the speed control problem was solved as two parts: torque management that decided torque demand and the torque
demand tracking. The simulations carried out in Matlab/Simulink verified the effectiveness of the controller. In addition, a test
platform of the EMVA for hardware-in-the-loop (HIL) simulation was established and the practicability of EMVA application
to engine intake systems was validated preliminarily. |
| Key Words:
Electromagnetic valve actuators, Cylinder air charge, Control-oriented model, Torque control, Speed control |
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Corresponding Author.
Siqin Chang , Email. 
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