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ALGORITHMIC PROVISION OF MONITORING OF IDENTITY OF CYLINDER POWERS OF POWER UNITS ON THE BASIS OF PROCESSING OF DIRECT INDIRECT DATA

A frequency-modulated instantaneous crankshaft speed signal is proposed as input information for monitoring the identity of the cylinder power of an internal combustion engine. Algorithmic software is based on solving a predefined system of linear algebraic equations with optimization of the solution based on the least-squares method. Frequency and time methods of signal measurement research are investigated. In the temporal representation, the system of algebraic equations is the balance between the values of the fluctuation signal of the first mass at specific points in time and the sum of the calculated contributions of the cylinders. The addition to the sum is determined by the product of the weights for the corresponding function of the contribution of the cylinder to the fluctuation signal. This function is calculated as the convolution interval between the torque of an individual cylinder and its transfer function. As a result of solving the system of equations, we obtain the weights of the cylinders, which are used to determine the distribution of cylinder power of the power unit. When comparing the methods, it was found that the time method of presentation provides better performance. A mathematical apparatus for estimating the maximum plausibility of the parameters of the determined components of the contributions of individual cylinders in the signal of fluctuations in the speed of rotation of the first mass of the crankshaft has been developed. An algorithm for estimating the weights of cylinders, which implements the correlation method of analysis, is also proposed. This provides a significant improvement in the signal-to-noise ratio in the measurement implementation of the signal of fluctuations in the speed of the crankshaft. An analytical expression for the cross-correlation function between the time realization of the fluctuation signal and the torque of the first cylinder is obtained. The scheme of the algorithm for monitoring of identity of cylindrical powers of the power unit is developed. The uncertainty of information technology for processing indirect measurement data is investigated and the requirements for metrological characteristics of hardware for measuring the signal of the instantaneous crankshaft speed signal are established.