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An Adaptive Idle Mode Control System
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1984 by SAE International in United States
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The optimum idle operating point for an internal combustion engine, in terms of fuel economy, emission levels, and idle quality, is a function of both the engine operating and environmental conditions. This paper reports on the development of an idle mode control system which adaptively adjusts the idle operating point in response to changes in these conditions. The control system described continually identifies the optimum idle operating point, defined in terms of engine crankshaft speed (fuel economy) and roughness level (idle quality), and maintains operation at this point under any set of operating conditions.
The control system objective is to maintain idle operation at the minimum speed possible without adversely effecting idle quality or emission levels. This is accomplished by operating at an idle speed which results in the maximum acceptable level of engine roughness. The roughness level is determined by an on line measurement technique based on crankshaft speed fluctuations. The roughness set-point is modified adaptively to reduce the frequency of poor combustion events that give rise to increased levels of unburned hydrocarbons (HC). Thus, the idle mode control system strives to reach the best compromise among fuel economy, idle quality, and emission levels under any operating conditions.
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CitationMihelc, W. and Citron, S., "An Adaptive Idle Mode Control System," SAE Technical Paper 840443, 1984, https://doi.org/10.4271/840443.
- Mihelc W. P. An Adaptive Microprocessor- Based Idle Mode Control System for Multicylinder Internal Combustion Engines Ph.D. Thesis Purdue University August 1983
- Mihelc W. P. Citron S. J. “An On-Line Engine Roughness Measurement Technique,” SAE Paper Number 840136 1984
- Ikeura K. Hosaka A. Yano T. “Microprocessor Control Brings About Better Fuel Economy With Good Driveability” SAE Paper Number 800056 1980
- Grimm R. A. Bremer R. J. Stonestreet S. P. “GM Micro-computer Engine Control System.” SAE Paper Number 80053 1980
- West G. “The General Motors Microprocessor Engine Control System.” meeting of Society of Automotive Engineers Student Chapter Purdue University October 22, 1980
- Scott D. “Stabilized Idling Cuts Consumption and Emissions.” Automotive, Engineering August 1979 66 67
- Emmenthal K. D. Hagemann G. Hucho W. H. “Turbocharging Small Displacement Spark Ignition Engines For Improved Fuel Economy.” SAE Paper Number 790311 1979
- Citron S. J. Mihelc W. P. “Engine Performance Monitor and Control System,” U.S. Patent Application 452,372 December 1982