Internal combustion engine crankshaft system with variable compression ratio, internal combustion engine and control method thereof

Abstract

The invention discloses an internal combustion engine crankshaft system with variable compression ratio, an internal combustion engine and a control method thereof. The crankshaft of the crankshaft system is mainly composed of a hollow crank arm and a connecting rod journal, and the connecting rod journal is movable relative to the crank arm. A rotating wheel is rotatably installed in the arm, and the rotating wheel can be rotated under the drive of electric power, hydraulic pressure or mechanical structure, and the connecting rod journal can move along the radial direction of the crankshaft driven by the rotating wheel, thereby changing the effective work of the crank throw. length, the internal combustion engine mainly adopts the above-mentioned crankshaft system, and is equipped with a hydraulic oil tank, a pump oil pipeline connected with the hydraulic oil circuit, an oil return pipeline, and a switching valve. The direction of in and out is to adjust the direction of rotation of the rotary wheel to achieve the purpose of adjusting the working length of the bell crank. It can meet the requirement of adjusting the compression ratio of the internal combustion engine, has good operability, is stable and reliable, and is beneficial to prolonging the service life of the internal combustion engine.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to an internal combustion engine crankshaft system with variable compression ratio, an internal combustion engine and a control method thereof. Background technique [0002] The compression ratio of an internal combustion engine is the ratio of the internal volume of the cylinder when the piston is at the bottom dead center to the internal volume of the cylinder when the piston is at the top dead center, which plays an important role in the power output and thermal efficiency of the internal combustion engine. According to the working principle of the internal combustion engine, the internal combustion engine needs a high compression ratio to improve the working efficiency of the internal combustion engine when the load is small, and a small compression ratio to avoid the so-called "knock" of the internal combustion engine and increase the power output when the lo...

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Problems solved by technology

Many published patents have also realized the variable compression ratio of internal combustion engines, mainly including changing the position of the main bearing of the crankshaft by using an eccentric wheel, changing the position of the connecting rod bearing by using an eccentric wheel, and changing the center position of the piston pin by using an eccentric wheel to change the main shaft of the crankshaft. The distance between the center and the top surface of the piston, but most of these structures will cause the eccentricity of the crankshaft main shaft, connecting rod shaft or piston pin, which will lead to problems such as poor working stability of the internal combustion engine, short service life or large abnormal noise.

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