Multi-mode two-stroke atkinson cycle internal-combustion engine with fully overhead valve

Abstract

The invention discloses a multi-mode two-stroke atkinson cycle internal-combustion engine with a fully overhead valve. According to two-stroke atkinson cycle, a scavenging process is offset on the basis of the two-stroke cycle, the distance of a compression stroke is reduced, and the distance of an expansion stroke is prolonged, and therefore, the atkinson cycle is realized and the balance of the internal-combustion engine is kept. On the basis of a common two-stroke internal-combustion engine, the multi-mode two-stroke atkinson cycle internal-combustion engine adopts an overhead embedded inlet valve with large gradient degree and an air cylinder head structure of a common exhaust valve, when the inlet valve is opened, the inlet valve temporarily serves as a separation board, a guiding function of a bulge on a formed top piston is utilized, so that a high-efficiency scavenging structure is realized; a fully variable valve timing mechanism is used to adjust the angle relation of the valve and a crank shaft, the opening and closing time of the inlet and outlet valve can be adjusted, and therefore, the internal-combustion engine has the following working modes: two-stroke atkinson cycle, two-stroke cycle and adjustable discharge capacity and compression ratio; and the efficiency of the internal-combustion engine is greatly improved.

Description

technical field [0001] The present invention relates to a multi-mode full overhead valve two-stroke internal combustion engine using a two-stroke Atkinson cycle, which adopts a new thermodynamic cycle called the two-stroke Atkinson cycle, and a variable cycle mode using this cycle overhead valve two-stroke internal combustion engine. 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. There are three main methods to improve the thermal efficiency of internal combustion engines: increase the expansion work of hot gas, reduce friction loss, and reduce cooling and heat dissipation. As a mechanical invention, heat dissipation and materials can be ignored, so the only ...

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Problems solved by technology

However, if this diversion structure is too large, the compression ratio will not be good, and if it is too small, it will not have the effect of isolating the intake and exhaust at all, and it will not be able to solve the problem of exhaust gas on the back of the valve.

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