An Analysis of the Working Process of a Diesel Engine under Cylinder Deactivation

Abstract

Обоснование эффективности отключения цилиндров как метода управления дизельным двигателем на частичных режимах часто проводят по характеристикам, соответствующим его работе без отключения цилиндров. При этом теоретические и практические результаты значительно различаются, так как рабочие процессы в отключенных и работающих цилиндрах протекают по-разному. Методом моделирования проведен анализ рабочего процесса дизельного двигателя при отключении цилиндров. С помощью компьютерной модели выполнены расчеты рабочих процессов в отключенных и работающих цилиндрах. Дана оценка потерь энергии, определяющих топливную экономичность двигателя. Установлено, что значительное влияние на удельный эффективный расход топлива оказывает работа системы газораспределения в отключенных цилиндрах. Рассмотрена работа двигателя на частичных по частоте вращения и крутящему моменту режимах при отключении различного числа цилиндров. Полученные результаты показывают особенности рабочего процесса дизельного двигателя при отключении цилиндров и позволяют более точно оценивать эффективность такого метода управления двигателями.Ключевые слова: дизельный двигатель, рабочий процесс, отключение цилиндров, система газораспределения, топливная экономичность, баланс энергии топливаThe effect of cylinder deactivation as a method of controlling a diesel engine working in partial load modes is usually justified based on the characteristics corresponding to the engine performance without cylinder deactivation. However, the results obtained through theoretical analysis and in practice have significant differences, since the working processes of activated and deactivated cylinders run in different ways. In this paper, a simulation method is used to analyze the working process of the diesel engine under cylinder deactivation. The working processes in activated and deactivated cylinders are calculated using a computer model, and energy losses determining engine fuel efficiency are estimated. It is shown that the valve system in deactivated cylinders has a significant effect on the specific fuel consumption. The engine performance in partial load modes at different rotational speeds and torques and with a varying number of deactivated cylinders is investigated. The results obtained demonstrate the characteristics of the engine working

Increase in the Fuel Efficiency of a Diesel Engine by Disconnecting Some of Its Cylinders

“…The objective of current research on internal combustion engines is to further reduce exhaust emissions while simultaneously reducing fuel consumption [1]. The issues of increasing the fuel efficiency of cars and tractors by disconnecting some of engine cylinders have not been sufficiently studied despite a significant number of publications dealing with this topic [2][3][4][5][6][7][8][9].…”

“…Liu and Kuznetsov [3] determined that the valve system in deactivated cylinders has a significant effect on the specific fuel consumption. Authors investigated the engine performance in partial load modes at different rotational speeds and torques and with a varying number of deactivated cylinders.…”

Simulation and Analysis of the Impact of Cylinder Deactivation on Fuel Saving and Emissions of a Medium-Speed High-Power Diesel Engine

“…CDA technology improves combustion quality and reduces emissions by transferring active cylinders from a low-efficiency to a high-efficiency operation range. The more significant the difference in efficiency and power from low load to medium load, the greater the possibility of CDA application on such engines [20,21]. Therefore, CDA has application potential for high-power engines, but runs at a light load and remains idle for a long time.…”