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A method of lean air-fuel ratio control using combustion pressure measurement

Lee, Albert T.; Wilcutts, Mark; Tunestål, Per LU and Hedrick, J. Karl (2001) In JSAE Review 22(4). p.389-393
Abstract
In this paper a method for control of air–fuel ratio (AFR) in cold or lean-burning spark-ignited engines is investigated. The technique uses combustion pressure as measured by a cylinder-mounted sensor, and is based on the phenomenon of increasing cycle-to-cycle combustion pressure variation as the air–fuel mixture approaches the limits of flammability. The cylinder pressure is measured from one engine cycle to the next, and large drops in mean effective pressure (IMEP) are used as an indicator of poor combustion. In response, the airflow or fuel flow to the engine can be manipulated. In a series of experiments, the air and fuel are alternately investigated as control inputs, and performance compared. The resulting control system is a... (More)
In this paper a method for control of air–fuel ratio (AFR) in cold or lean-burning spark-ignited engines is investigated. The technique uses combustion pressure as measured by a cylinder-mounted sensor, and is based on the phenomenon of increasing cycle-to-cycle combustion pressure variation as the air–fuel mixture approaches the limits of flammability. The cylinder pressure is measured from one engine cycle to the next, and large drops in mean effective pressure (IMEP) are used as an indicator of poor combustion. In response, the airflow or fuel flow to the engine can be manipulated. In a series of experiments, the air and fuel are alternately investigated as control inputs, and performance compared. The resulting control system is a high-bandwidth AFR control strategy that can be used under cold or lean conditions when conventional exhaust gas oxygen sensor cannot be used. Moreover, the method is directly tied to the combustion process and the relevant performance measure — combustion stability — that is perceptible to the driver as a rough-running engine. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cylinder Pressure, Lean, Control, Combustion, Engine
in
JSAE Review
volume
22
issue
4
pages
389 - 393
publisher
Elsevier
ISSN
0389-4304
DOI
10.1016/S0389-4304(01)00121-7
language
English
LU publication?
yes
id
e8bedbc8-a89c-4829-a1e4-1fa77c7d9028 (old id 163642)
date added to LUP
2007-07-04 09:29:51
date last changed
2018-05-29 12:20:07
@article{e8bedbc8-a89c-4829-a1e4-1fa77c7d9028,
  abstract     = {In this paper a method for control of air–fuel ratio (AFR) in cold or lean-burning spark-ignited engines is investigated. The technique uses combustion pressure as measured by a cylinder-mounted sensor, and is based on the phenomenon of increasing cycle-to-cycle combustion pressure variation as the air–fuel mixture approaches the limits of flammability. The cylinder pressure is measured from one engine cycle to the next, and large drops in mean effective pressure (IMEP) are used as an indicator of poor combustion. In response, the airflow or fuel flow to the engine can be manipulated. In a series of experiments, the air and fuel are alternately investigated as control inputs, and performance compared. The resulting control system is a high-bandwidth AFR control strategy that can be used under cold or lean conditions when conventional exhaust gas oxygen sensor cannot be used. Moreover, the method is directly tied to the combustion process and the relevant performance measure — combustion stability — that is perceptible to the driver as a rough-running engine.},
  author       = {Lee, Albert T. and Wilcutts, Mark and Tunestål, Per and Hedrick, J. Karl},
  issn         = {0389-4304},
  keyword      = {Cylinder Pressure,Lean,Control,Combustion,Engine},
  language     = {eng},
  number       = {4},
  pages        = {389--393},
  publisher    = {Elsevier},
  series       = {JSAE Review},
  title        = {A method of lean air-fuel ratio control using combustion pressure measurement},
  url          = {http://dx.doi.org/10.1016/S0389-4304(01)00121-7},
  volume       = {22},
  year         = {2001},
}