A Control Strategy Based on Exact Linearization for Electromagnetic Valve Actuation

2007-01-1596

04/16/2007

Event
SAE World Congress & Exhibition
Authors Abstract
Content
Electromagnetic Valve Actuation (EVA) is considered to be a potential substitute of conventional valvetrains for automotive engines. However, valve quiet-seating (soft-landing) is difficult to be achieved. The EVA system and hence its’ mathematic model is nonlinear. Therefore, when linear control is used for EVA, firstly, the model has to be linearized at an equilibrium point through Taylor expansion. Consequently, the linearized model and control are valid only for a small range around the equilibrium point. This paper presents a control strategy for the whole transition of EVA, which combines exact linearization with Linear Quadratic Regulator (LQR). Firstly, the nonlinear EVA model is transformed to be linear in a new coordinate by using exact linearization, so the nonlinear model is not involved. Then the exact-linearized model is used for the EVA control with LQR. In this case, since the model is exactly linear at any point of the transition, the whole transition is within the reach of LQR control. A prototype of EVA developed by authors is controlled with this control strategy. A landing velocity of 0.04m/s is achieved in single transition as well as 0.08m/s in sequence operation.
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Details
DOI
https://doi.org/10.4271/2007-01-1596
Pages
10
Citation
Huang, R., and Zhao, Y., "A Control Strategy Based on Exact Linearization for Electromagnetic Valve Actuation," SAE Technical Paper 2007-01-1596, 2007, https://doi.org/10.4271/2007-01-1596.
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Publisher
Published
Apr 16, 2007
Product Code
2007-01-1596
Content Type
Technical Paper
Language
English