ERFWHG CHANGE IN THE PULSE-POWER CHARACTERISTICS OF THE ENGINE WORKING WITH THE CYLINDER DISCONNECTING IN IDLE MODE

Abstract

The parameters of gas-dynamic processes in the engine cylinders affect the forces on the supports. By evaluating the impulse actions and peak values of the forces on the supports, it is possible to evaluate the efficiency of each cylinder. (Research purpose) The research purpose is studying the process of changing the external impulse-power characteristics of an internal combustion engine operating in idle mode with some disconnected cylinders. (Materials and methods) The article presents a methodology for quantifying the impulse effect of the engine on the supports during the combustion cycle and expansion of each cylinder and experimental studies on a diesel four-cylinder four-stroke engine D-243. During the research, the fuel supply to one, two and three cylinders was gradually turned off and the forces arising in the supports were recorded using strain sensors and a set of measuring equipment. (Results and discussion) With uniform engine operation with a minimum crankshaft rotation speed in idle mode, the peak values of the forces on the supports during the combustion and expansion cycles reached an average value of 200 newtons, the magnitude of their impulse action takes an average value of 8.2 kilonewtons-seconds equal for all cylinders. With the gradual shutdown of the cylinders, the peak values of the forces on the supports at the combustion and expansion stroke increase to 910 newtons when working with only one cylinder, and the average value of the force pulse is 50 kilonewtons-seconds. The depressurization of non-working cylinders increases the peak force effect of the working engine cylinder on the supports to 1200 newtons, and the pulsed force effect up to 85 kilonewtons-seconds. (Conclusions) The proposed methodology for evaluating the parameters of the gas-dynamic processes of the engine based on the external pulse-power characteristics will allow to quickly assess the technical condition and efficiency of each cylinder and the engine as a whole.