0
research-article

Cycle-to-cycle Feedback for Combustion Control of Spark Advance at the Misfire Limit

[+] Author and Article Information
Bryan P. Maldonado

Department of Mechanical Engineering, 1231 Beal Ave. University of Michigan, Ann Arbor, Michigan 48109, USA
bryanpm@umich.edu

Anna G. Stefanopoulou

Department of Mechanical Engineering, 1231 Beal Ave. University of Michigan, Ann Arbor, Michigan 48109, USA
annastef@umich.edu

1Corresponding author.

ASME doi:10.1115/1.4039728 History: Received February 17, 2018; Revised February 18, 2018

Abstract

At a given speed and load, the spark advance (SA) is tuned to reach the maximum break torque (MBT) timing to maximize efficiency. The use of exhaust gas recirculation (EGR) can further improve fuel economy at the same speed and load. As EGR increases, MBT moves towards a more advanced timing that can be limited by the high variability in the combustion process, reflected in unacceptable torque fluctuations. This variability is rapidly increased by the random occurrence of partial burns and/or misfires. In order to operate close to the misfire limit, a stochastic misfire controller has been designed to momentarily move from an undesired to an allowable misfire rate, without significantly increasing variability in the combustion process. Control-oriented models for the combustion process and misfire events are discussed. Simulation of the closed-loop system shows that the feedback misfire controller, on average, stays closer to the misfire limit than a more conventional controller designed to react when a misfire is detected.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In