Double-Atkinson-cycle internal combustion engine

Abstract

The invention discloses a double-Atkinson-cycle internal combustion engine. According to the internal combustion engine, a gas inlet door is adjusted and subjected to time correction according to the Atkinson cycle requirement, an exhaust door is opened earlier compared with a frequent situation, high-temperature fuel gas can be ejected out of a cylinder in advance, a turbine is propelled to do work, and when the gas pressure in the cylinder drops and approximates the gas pressure of a gas inlet pipe, a piston right reaches a lower dead center; the high-temperature and high-pressure fuel gas further expands through the turbine to do work, and more energy can be absorbed; the turbine is connected with a crankshaft of the internal combustion engine through a speed changer, absorbed mechanical work is transmitted to the crankshaft, the output power and the efficiency of the internal combustion engine are increased, an Atkinson cycle is also achieved, and in other words, the Atkinson cycle is achieved on both the gas inlet door and the exhaust door. The double-Atkinson-cycle internal combustion engine achieves balance and is high in power density and practical.

Description

technical field [0001] The present invention relates to a dual Atkinson cycle internal combustion engine having the characteristics of the Atkinson cycle and similar efficiency with a higher power density. Background technique [0002] Improvement in order to increase the thermal efficiency of internal combustion engines is the most important improvement design of internal combustion engines. The most commonly used four-stroke and two-stroke internal combustion engines can never reach the theoretical maximum thermal efficiency pointed out by the Carnot cycle theory. To improve the thermal efficiency of internal combustion engines, the current mainstream approach is to use the Atkinson cycle invented by Atkinson as early as 1882. This is a four-stroke thermodynamic process in which the expansion stroke is greater than the compression stroke, which can fully expand the high-temperature gas to improve thermal efficiency. But the Miller cycle—a modified version of the Atkinson ...

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Problems solved by technology

[0003] The traditional Atkinson internal combustion engine is inertial unbalanced, so it is difficult to use practically

Although the Miller cycle internal combustion engine is well balanced, because the air entering the cylinder is relatively small, the power density has always been the biggest defect and cannot be used on a large scale

The method of directly adding an expander to the exhaust pipe of the internal combustion engine was not adopted because there was no suitable adjustable expander, and adding it would have an adverse effect on the torque and output power of the internal combustion engine

[0004] The patent application number 201310184706.3 is a multi-mode full overhead valve two-stroke internal combustion engine using the two-stroke Atkinson cycle. Although the efficiency of the equivalent four-stroke Atkinson internal combustion engine can be achieved, the slowness of the scavenging process of the two-stroke internal combustion engine is limited. The speed is reduced, so the power density cannot reach higher

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