Method and crank-connecting rod mechanism for full constant-volume combustion of IC engine

Abstract

A method for realizing full constant-volume combustion of IC engine is characterized by that a crank / connecting-rod mechanism is used to make the piston stay at top stop point until the combustion is finished when the rotation angle of crankshaft is 25-40 deg. Its crank / connecting-rod mechanism is composed of piston pin, connecting rod and crank. The two ends of connecting rod are respectively connected with piston pin and crank. Said piston pin consists of cap and rod which can rotate around the cap by 25-40 deg. Its advantage is the greatly increase heat efficiency.

Description

Technical field: [0001] The present invention relates to single-cylinder and multi-cylinder internal combustion engines applied to diesel engines, gasoline engines, natural gas engines and alternative fuel engines, in particular to a method capable of realizing complete isovolumic combustion of internal combustion engines and an improved structure of crank connecting rod mechanism designed by the method . Background technique: [0002] Internal combustion engines are widely used in modern life. Limited by the traditional cycle, the current cycle of internal combustion engines has the following deficiencies, which limit the thermal efficiency of internal combustion engines. 1) The piston stays at the top dead center for a short time: when the traditional cycle piston is at the top dead center, the number of crankshaft rotation angles to keep the compression volume constant is very small. When the fuel in the cylinder is burning, it is required to convert the chemical energy ...

AI Technical Summary

Problems solved by technology

Because the piston stays at the top dead center for a short time, the corresponding isovolume is small, and the combustion rate is limited. Therefore, the maximum combustion pressure and temperature of the internal combustion engine are limited, resulting in time loss of the internal combustion engine and affecting the cycle thermal efficiency of the internal combustion engine.

2) Large heat dissipation area: due to the small equivalent volume of the traditional cycle, it cannot guarantee the completion of fuel combustion under the condition of constant compression volume

The increase of the heat dissipation area will increase the heat transfer loss of high-temperature gas and affect the thermal efficiency of the internal combustion engine

3) Failure to output work in time: When the piston starts to go down, the crankshaft rotation angle is small, the effective arm force is small, and basically no work can be output

When the effective force arm increases, the gas pressure drops rapidly, and the mechanical work cannot be output in time, resulting in increased heat transfer loss, increased exhaust gas energy, and affects thermal efficiency.

4) Increased compression negative work: Due to the small isovolumic degree, it must be ignited or ignited in advance

Before the top dead center, it starts to ignite and burn, and the combustion pressure rises rapidly, preventing the piston from moving upward, increasing the compression work and reducing the output work

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