A method of estimating the volumetric efficiency of an engine by using a piezo-electric pressure transducer to measure the compression pressure during a non-firing engine cycle is described and the results obtained are compared with those derived from a direct measurement of air flow. The results produced by the two techniques agree to within ±3% at speeds up to 2500 rpm and are in good agreement with those obtained from an infra-red exhaust gas analysis when the engine was firing.
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References
1.
HarrowG A, “Some applications of basic combustion research to gasoline engine development problems”, S.A.E. Paper No 680765, Oct 1968.
2.
HarrowG AOrmanP LToftG B, “The effects of engine operating variables on the time of flame propagation in a spark ignition engine”, J Inst Pet, 1963, 49 (No 475), 204.
3.
KhayatM, “Pressure measurement by piezo-electric transducers in reciprocating combustion engines”, MSc thesis, University of Durham, 1969.
4.
NagaoFShimamotoYNaganoHUenoY“The influence of connecting passages of a low pressure indicator on recording”, Bull JSME1963, 6(No 21), 78.
5.
LivengoodJ C, “Development of a method of measuring the end gas temperatures of an internal combustion engine”, MIT Report, 1955–56, 50.
6.
TaylorC FTaylorE S, “The internal combustion engine”, International Textbook Co, New York, 1961, 247.
