Nonlinear Control Techniques to Reduce Automotive SI Engine Coldstart Hydrocarbon Emissions
Pannag R Sanketi

Citation
Pannag R Sanketi. "Nonlinear Control Techniques to Reduce Automotive SI Engine Coldstart Hydrocarbon Emissions". Master's thesis, University of California at Berkeley, May, 2005.

Abstract
This thesis investigates the use of nonlinear model-based control techniques to control the hydrocarbon (HC) emissions during the warm-up of an automotive spark ignition engine. Almost three quarters of the hydrocarbon emissions emitted by an automobile in a typical drive-cycle are produced during the first two minutes of its operation called the coldstart period. In this paper, we propose a way to decrease cold start emissions. The controller is built around a mean value engine model and a simplified catalyst model characterized by thermal dynamics, oxygen storage and static efficiency curves. Initially, a nonlinear controller based on offline treatment of catalyst model was analyzed. An adaptive sliding control strategy was developed to make it more robust. A nonlinear compensator was designed for this controller and the effects of sensor measurement noise and measurement delay are studied. Results indicate that the control of engine-out exhaust gas temperature for faster catalyst light-off with catalyst not in the closed loop could be detrimental to the catalyst. Hence, a control scheme where the catalyst is included in the feedback loop for control is developed. The algorithm comprises engine-out hydrocarbon emissions control and catalyst temperature control through dynamic surface control to reduce the tailpipe emissions. It is shown that reduced tailpipe emissions can be achieved with the new control scheme without the risk of damaging the catalyst. Throughout the analysis, a model-based controller is used so as to aid the generation of an efficient controller.

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• HTML

  Pannag R Sanketi. <a
  href="http://chess.eecs.berkeley.edu/pubs/88.html"
  ><i>Nonlinear Control Techniques to Reduce
  Automotive SI Engine Coldstart Hydrocarbon
  Emissions</i></a>, Master's thesis,  University
  of California at Berkeley, May, 2005.

• Plain text

  Pannag R Sanketi. "Nonlinear Control Techniques to
  Reduce Automotive SI Engine Coldstart Hydrocarbon
  Emissions". Master's thesis,  University of California
  at Berkeley, May, 2005.

• BibTeX

  @mastersthesis{Sanketi05_NonlinearControlTechniquesToReduceAutomotiveSIEngine,
      author = {Pannag R Sanketi},
      title = {Nonlinear Control Techniques to Reduce Automotive
                SI Engine Coldstart Hydrocarbon Emissions},
      school = {University of California at Berkeley},
      month = {May},
      year = {2005},
      abstract = {This thesis investigates the use of nonlinear
                model-based control techniques to control the
                hydrocarbon (HC) emissions during the warm-up of
                an automotive spark ignition engine. Almost three
                quarters of the hydrocarbon emissions emitted by
                an automobile in a typical drive-cycle are
                produced during the first two minutes of its
                operation called the coldstart period. In this
                paper, we propose a way to decrease cold start
                emissions. The controller is built around a mean
                value engine model and a simplified catalyst model
                characterized by thermal dynamics, oxygen storage
                and static efficiency curves. Initially, a
                nonlinear controller based on offline treatment of
                catalyst model was analyzed. An adaptive sliding
                control strategy was developed to make it more
                robust. A nonlinear compensator was designed for
                this controller and the effects of sensor
                measurement noise and measurement delay are
                studied. Results indicate that the control of
                engine-out exhaust gas temperature for faster
                catalyst light-off with catalyst not in the closed
                loop could be detrimental to the catalyst. Hence,
                a control scheme where the catalyst is included in
                the feedback loop for control is developed. The
                algorithm comprises engine-out hydrocarbon
                emissions control and catalyst temperature control
                through dynamic surface control to reduce the
                tailpipe emissions. It is shown that reduced
                tailpipe emissions can be achieved with the new
                control scheme without the risk of damaging the
                catalyst. Throughout the analysis, a model-based
                controller is used so as to aid the generation of
                an efficient controller.},
      URL = {http://chess.eecs.berkeley.edu/pubs/88.html}
  }
  

Posted by Pannag R Sanketi on 11 May 2006.
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