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SUMMARY:Discrete-Time Extremum-Seeking for Wiener-Hammerstein Plants with 
 Applications to Online Engine Optimisation - Dr. Rohan Shekhar\, Universit
 y of Melbourne
DTSTART:20131218T140000Z
DTEND:20131218T151500Z
UID:TALK47342@talks.cam.ac.uk
CONTACT:Tim Hughes
DESCRIPTION:Extremum-Seeking (ES) is a non model-based closed-loop control
  paradigm for optimising the steady-state output of nonlinear dynamic plan
 ts.  This talk will introduce a new formulation of ES for discrete-time pl
 ants possessing a Wiener-Hammerstein structure\, which consists of a stati
 c nonlinear map with linear input and output dynamics.  A novel method of 
 analysis using Linear Parameter-Varying (LPV) system theory will be applie
 d to demonstrate semi-global stability of the control scheme.  Assuming on
 ly limited plant knowledge\, the stability result ensures convergence of t
 he plant output to a point in an arbitrarily small neighbourhood of the ex
 tremum\, for appropriately chosen controller parameters.  Unlike most sche
 mes in the literature\, the result does not rely upon explicit time-scale 
 separation arguments.  Experimental results will show how the scheme is ab
 le to maximise the output torque of an internal combustion engine in the p
 resence of an uncertain fuel composition\, by modifying the spark timing.
LOCATION:Cambridge University Engineering Department\, LR6
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