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Mixed {cal H}_{2}/{cal H}_{\infty } Observer-Based LPV Control of a Hydraulic Engine Cam Phasing Actuator

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4 Author(s)
White, A. ; Dept. of Mech. Eng., Michigan State Univ., East Lansing, MI, USA ; Zhen Ren ; Guoming Zhu ; Jongeun Choi

In this paper, a family of linear models previously obtained from a series of closed-loop system identification tests for a variable valve timing cam phaser system is used to design a dynamic gain-scheduling controller. Using engine speed and oil pressure as the scheduling parameters, the family of linear models was translated into a linear parameter varying (LPV) system. An observer-based gain-scheduling controller for the LPV system is then designed based on the linear matrix inequality technique. A discussion on weighting function selection for mixed H2/H controller synthesis is presented, with an emphasis placed on examining various frequency responses of the system. Test bench results show the effectiveness of the proposed scheme.

Published in:

Control Systems Technology, IEEE Transactions on  (Volume:21 ,  Issue: 1 )