METHOD OF ESTIMATING WORKING STATE OF INTERNAL COMBUSTION ENGINE Russian patent published in 2005 - IPC

FIELD: diagnostics of internal combustion engines.

SUBSTANCE: method of estimation is based upon presetting modes of operations of engine, upon measurement of factors of state of systems of engine to be diagnosed, upon determination of deviation in factors of state, upon calculations and estimation of working state of internal combustion engine by the results of calculation. Parameters of pressure pulsations of medium are taken as factors of states. Pulsation curve at input and output of filtering member of the system to be diagnosed is put into harmonic series and amplitude and phase frequency characteristics are built at preset frequency range. Comparison has to be done within range of higher sensitivity of measured frequencies. The result of comparison has to be the value and speed of deviation of amplitude and phase frequency characteristics from standard ones achieved under the condition of most efficient operation of the system; residual resource of operation of engine is determined from the result achieved.

EFFECT: improved precision of estimation.

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