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Description: An Allis Chalmers 649T engine was equipped to operate as a dual-fueled CI engine on fumigated 190 proof ethanol and diesel fuel. Maximum, 75% of maximum, and 50% of maximum ethanol substitution levels were evaluated to determine parameters of a direct injection turbocharged diesel engine which reflect engine load (torque) and allowable alter nate fuel substitution, and to evaluate the use of spark ignition (SI) knock sensing technology as a measure of combustion knock. Equa tions using engine speed, normalized fuel consumption, intake mass airflow, intake boost pressure, and rate of exhaust energy rejection were developed to predict engine torque and allowable secondary fueling level. The normalized fuel consumption equation was the best predictor of engine torque, but air consumption best reflected the max imum ethanol substitution limits. Two commercial combustion knock sensors were evaluated, and of these the Carter transducer showed the most promise. The use of normalized fuel flow or exhaust energy loss equations as measures of engine load combined with the use of com bustion knock as determined by the Carter transducer showed promise as control and feedback parameters for a dual-fuel control system. Fur ther research in the dual-fuel area should employ combustion pres sure sensing to detect the onset of combustion knock and misfire and, therefore, determine the maximum allowable substitution levels of secondary fuels in a reliable manner.
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Citation: M.A. Stumborg 1989. INVESTIGATION OF ALTERNATE FUEL CONTROL PARAMETERS FOR A DIESEL ENGINE. Canadian Agricultural Engineering 31(1):25-33.
Volume: 31
Issue: 1
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Date: 1989
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Type: Text.Article
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Coverage: Canada
Language 1: en
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Rights: Canadian Society for Bioengineering
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