NDLI: Iterative learning control of a camless valve actuation system with internal feedback

Content Provider	IEEE Xplore Digital Library
Author	Heinzen, A. Gillella, P. Zongxuan Sun
Copyright Year	2011
Description	Author affiliation: Dept. of Mech. Eng., Univ. of Minnesota, Twin Cities, Minneapolis, MN, USA (Heinzen, A.; Gillella, P.; Zongxuan Sun)
Abstract	This paper presents the iterative learning control of an electro-hydraulic fully flexible engine valve actuation system. The specific camless system has a unique hydro-mechanical feedback mechanism that simplifies the external control to the choice of triggering timings for three two-state valves. All the critical parameters describing the engine valve event, i.e. lift, duration, timing, and seating velocity, can be continuously varied by controlling these timings. Initial testing of a prototype experimental setup reveals that the performance of the system (transient tracking and steady-state variability) is influenced purely by the state of the system when the internal feedback mechanism is activated. This feature, along with the cyclic nature of the engine valve operation, motivates the development of a iterative-learning-based feedback and feed-forward controller to identify and set the optimal operating point in real time using the output of the previous cycle and the desired performance. The learning control implementation presented here is unique in that, instead of calculating a control signal (sequence) for each cycle, it sets the triggering timings for each of the on-off valves, which directly affect the initial conditions for the internal feedback loop. Experimental results demonstrate that the controller is able to minimize lift and closing time errors while satisfying the seating velocity constraint even during aggressive transient operation.
Sponsorship	Control Syst. Soc.
Starting Page	408
Ending Page	413
File Size	439151
Page Count	6
File Format	PDF
ISBN	9781457700804
ISSN	07431619
e-ISBN	9781457700811
DOI	10.1109/ACC.2011.5991353
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	American Automatic Control Council(AACC)
Subject Keyword	Valves Engines Actuators Timing Design automation Reservoirs Real time systems
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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