Determination of a piston TDC

Paper presents experimental and numerical studies of thermodynamic loss angle (TLA), which as correction constant should be entered to the program for thermodynamic analysis of engine cycle. Obtained results differ at the level of 0.2 CAD. Taking into consideration that the measurement uncertainty is not less than 0.1 CAD, the observed differences support the thesis that the TLA is a characteristic value which should be evaluated individually for each measurement issue. One took into account the also unique method of marking TDC proposed by Tazerout, Le Corre, and Rousseau. A base to marking TDC is the displacement of the course of the pressure for 0, 45° left, with relation to of the position, wherein follows the disappearance on the graph T(S) of the characteristic loop.

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