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Flatness-Based Feedback Control of an Automotive Solenoid Valve

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3 Author(s)
Chung, S.K. ; Dept. of Mech. Eng., Alberta Univ., Edmonton, Alta. ; Koch, C.R. ; Lynch, A.F.

This brief considers the control of solenoid valve actuators used for gas exchange in internal combustion engines. Although solenoid valves offer performance benefits over traditional camshaft-based valve systems, maintaining low impact velocity is a critical performance requirement. Flatness provides a convenient framework for meeting a number of performance specifications on the valve's end motion. The proposed control design incorporates voltage constraints, nonlinear magnetic effects, and various motion planning requirements. A flat output acts as a design parameter and is parameterized with a spline basis. A nonlinear feasibility problem is solved to obtain optimal spline coefficients such that performance requirements are met. The resulting flat output provides an open-loop control which is augmented with feedback so that a linear stable tracking error system results. The proposed control scheme is demonstrated in simulation and on an experimental testbed. The performance of a proportional-integral controller is compared experimentally to the flatness-based method

Published in:

Control Systems Technology, IEEE Transactions on  (Volume:15 ,  Issue: 2 )