To investigate the influence of various factors and algorithms to analyze the accuracy of evaluating the effectiveness of the working process in the course of each of the cylinders of the en-gine has been developed a mathematical model consisting of two independent parts: the first emu-lates the multi-cylinder internal combustion engine and a second software processing information coming from the first block. This article provides an analysis of the impact of various factors on the accuracy of the diagnosis workflow in each of the cylinders 4 cylinder engine, using an emulator of information that can flow from the engine during registration instantaneous speed of the crankshaft
multi-cylinder internal combustion engine, diagnostics, workflow, irregularity of the crankshaft, rotary encoders, mathematical model