Форсирование четырехтактного двигателя путем перевода на работу по двухтактному циклу в режимах с низкими частотами вращения

Abstract

Improving the dynamic qualities of internal combustion engines and the throttle response of vehicles equipped with them is an urgent problem in engine building. To solve it, we suggest switching a four-stroke engine to a two-stroke cycle at low-speed modes. Within the study, we found that the worst indicators of fuel efficiency of two-stroke engines are partially compensated by the best indicators of their power density. We took a close look at the switching of the 2 / 4SIGHT gasoline engine of the British company Ricardo from a four-stroke cycle to a two-stroke cycle. To implement the switching, we used a two-stage intercooled supercharging and a gas distribution valve switching system. The method proved to be applicable to diesel engines as well. Hence, we studied a diesel engine D-245 (4 CHN 11.0 / 12.5) mounted on a tracked vehicle. At a speed of 1600… 2400 min – 1, such a diesel engine operates in a four-stroke cycle, at lower speeds it operates in a two-stroke cycle. Finally, we did computational studies of the working process of this diesel engine. The study showed the expediency of switching the engine to a two-stroke cycle at low-speed modes.