Improving the uncertainty of measured and calculated data in engine problems using the equalisation calculus

A selected example of the application of the equalization calculus to reconcile the results of experimental tests of a spark-ignition internal combustion engine is presented. The example concerns the selection of characteristic parameters of the theoretical Seiliger-Sabathe cycle in accordance with the experimentally determined real cycle. This is therefore a so-called inverse problem. The isochoric and isobaric loading parameters and the heat distribution number were reconciled. In addition, the effect of applying the reconciliation algorithm twice on the correction of measurement results with gross errors is presented. The calculations carried out and the results obtained confirmed the need to use equalizing calculus to reduce deviations of the calculation results.