ОПРЕДЕЛЕНИЕ ПОЦИЛИНДРОВОЙ МОЩНОСТИ ДВИГАТЕЛЯ ВНУТРЕННЕГО СГОРАНИЯ ПРИ РАБОТЕ В РЕЖИМЕ СВОБОДНОГО РАЗГОНА

Abstract

Efficient operation of transport and technological machines for agricultural purposes is impossible without a timely assessment of the energy performance of their internal combustion engines. The torque and power of each cylinder can be estimated by the magnitude of the reactions of the engine support when operating in free acceleration mode with some of the cylinders disconnected. (Research purpose) The research purpose is improving the method of determining the cylinder-by-cylinder power of an internal combustion engine in the free acceleration mode by the magnitude of the reactions on its supports. (Materials and methods) Developed a methodology for estimating the power of each engine cylinder by the magnitude of the reactions on its supports and the current value of the crankshaft speed. Experimental studies were carried out on a diesel four-cylinder four-stroke engine D-243. During the execution of the research program, the fuel supply to one or two cylinders was gradually turned off, the engine operation mode was set to free acceleration, and forces arising in the supports were recorded using strain gauges and a set of measuring equipment. The following research methods were applied: a priori ranking, regression and computational analysis. (Results and discussion) It was found that the maximum torque is reached in the crankshaft speed range of 1298-1467 revolutions per minute and is 285 nanometers when all cylinders are running, 219 - when three cylinders are running and 148 - when two cylinders are running. The maximum value of the effective power was 57.8 kilowatts for all cylinders, 34 for three cylinders and 22 for two cylinders. It was determined when assessing engine power during the alternate shutdown of one of the cylinders that the effective engine power varies in the range of 33-33.4 kilowatts. (Conclusions) The obtained results of experimental studies can be used in the implementation of a method for operational control of the power of each cylinder of an internal combustion engine under operating conditions.