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Instrument to average 100 data setsAn instrumentation system is currently under development which will measure many of the important parameters associated with the operation of an internal combustion engine. Some of these parameters include mass-fraction burn rate, ignition energy, and the indicated mean effective pressure. One of the characteristics of an internal combustion engine is the cycle-to-cycle variation of these parameters. A curve-averaging instrument has been produced which will generate the average curve, over 100 cycles, of any engine parameter. the average curve is described by 2048 discrete points which are displayed on an oscilloscope screen to facilitate recording and is available in real time. Input can be any parameter which is expressed as a + or - 10-volt signal. Operation of the curve-averaging instrument is defined between 100 and 6000 rpm. Provisions have also been made for averaging as many as four parameters simultaneously, with a subsequent decrease in resolution. This provides the means to correlate and perhaps interrelate the phenomena occurring in an internal combustion engine. This instrument has been used successfully on a 1975 Chevrolet V8 engine, and on a Continental 6-cylinder aircraft engine. While this instrument was designed for use on an internal combustion engine, with some modification it can be used to average any cyclically varying waveform.
Document ID
19780003358
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Tuma, G. B. (NASA Lewis Research Center Cleveland, OH, United States)
Birchenough, A. G. (NASA Lewis Research Center Cleveland, OH, United States)
Rice, W. J. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
October 1, 1977
Subject Category
Electronics And Electrical Engineering
Report/Patent Number
E-9159
NASA-TP-1055
Accession Number
78N11301
Funding Number(s)
PROJECT: RTOP 505-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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