eprintid: 491
rev_number: 13
eprint_status: archive
userid: 7
dir: disk0/00/00/04/91
datestamp: 2011-07-27 08:43:56
lastmod: 2011-08-05 13:43:06
status_changed: 2011-07-27 08:43:56
type: article
metadata_visibility: show
contact_email: alberto.bemporad@imtlucca.it
item_issues_count: 0
creators_name: Giorgetti, Nicolò
creators_name: Ripaccioli, Giulio
creators_name: Bemporad, Alberto
creators_name: Kolmanovsky, Ilya
creators_name: Hrovat, Davor
creators_id: 
creators_id: 
creators_id: alberto.bemporad@imtlucca.it
creators_id: 
creators_id: 
title: Hybrid model predictive control of direct injection stratified charge engines
ispublished: pub
subjects: TJ
subjects: TL
divisions: CSA
full_text_status: none
keywords: air-to-fuel ratio; automotive microcontroller; gasoline direct injection stratified charge engines; hybrid dynamical system; hybrid model predictive control; mixed-integer quadratic optimization; spark timing;torque; two-mode discrete-time switched affine system; discrete time systems; internal combustion engines; predictive control; sparks; time-varying systems; torque
abstract: This paper illustrates the application of hybrid modeling and model predictive control techniques to the management of air-to-fuel ratio and torque in advanced technology gasoline direct-injection stratified-charge (DISC) engines. A DISC engine is an example of a constrained hybrid dynamical system, because it can operate in two distinct modes (stratified and homogeneous) and because the mode-dependent constraints on the air-to-fuel ratio and on the spark timing need to be enforced during its operation to avoid misfire, knock, and high combustion variability. In this paper, we approximate the DISC engine dynamics as a two-mode discrete-time switched affine system. Using this approximation, we tune a hybrid model predictive controller with integral action based on online mixed-integer quadratic optimization, and show the effectiveness of the approach through simulations. Then, using an offline multiparametric optimization procedure, we convert the controller into an equivalent explicit piecewise affine form that is easily implementable in an automotive microcontroller through a lookup table of linear gains
date: 2006
date_type: published
publication: IEEE/Asme Transactions on Mechatronics 
volume: 11
number: 5
publisher: IEEE
pagerange: 499-506
id_number: 10.1109/TMECH.2006.882979
refereed: TRUE
issn: 1083-4435
related_url_url: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1709854&isnumber=36073
citation:   Giorgetti, Nicolò and Ripaccioli, Giulio and Bemporad, Alberto and Kolmanovsky, Ilya and Hrovat, Davor  Hybrid model predictive control of direct injection stratified charge engines.  IEEE/Asme Transactions on Mechatronics , 11 (5).  pp. 499-506.  ISSN 1083-4435      (2006)