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Engine, engine variable compression ratio mechanism and control method thereof

A compression ratio, engine technology, applied in the direction of engine control, machine/engine, mechanical equipment, etc., can solve the problems of high fuel consumption and emissions, and achieve the effect of prolonging service life and reducing sliding friction

Active Publication Date: 2019-11-26
SAIC MOTOR
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] However, this fixed compression ratio cannot make the engine perform better in various working conditions, and there are problems of high fuel consumption and emissions

Method used

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  • Engine, engine variable compression ratio mechanism and control method thereof
  • Engine, engine variable compression ratio mechanism and control method thereof
  • Engine, engine variable compression ratio mechanism and control method thereof

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Embodiment Construction

[0048] The compression ratio of the engine refers to the degree to which the engine mixture is compressed. Specifically, it can be expressed by the ratio of the total volume of the cylinder before compression to the volume of the cylinder after compression. Since the volume of the combustion chamber and the working volume of the cylinder are usually defined in advance in the design, they are all fixed parameters, so the compression ratio of the existing automobile engine cannot be changed during the working process. However, this fixed compression ratio cannot make the engine perform better in various working conditions, so there are problems of high fuel consumption and emissions.

[0049] In the embodiment of the present invention, the eccentric bearing bush is assembled between the connecting rod and the crank journal of the crankshaft, and the connection and unlocking of the eccentric bearing bush and the big end hole of the connecting rod is controlled by hydraulic pressur...

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Abstract

The invention provides an engine, an engine variable compression ratio mechanism and a control method thereof. The engine variable compression ratio mechanism comprises an eccentric bearing bush which is arranged between a connecting rod and a crankshaft neck. The inner wall of the eccentric bearing bush is provided with an oil groove which communicates with an oil hole in the crankshaft neck. The outer wall of the eccentric bearing bush is provided with an arc-shaped limiting groove. The eccentric bearing bush is provided with two step lock pin holes penetrating the inner wall and the outer wall. Large holes of the step lock pin holes are formed in the two ends of the limiting groove correspondingly, communicate with the outer wall and are provided with lock pins. Small holes of the step lock pin holes communicate with the oil groove and are suitable for pushing the lock pins in the large holes of the step lock pin holes under the oil pressure effect of the oil hole in the crankshaft neck. Large head holes of the connecting rod are provided with step holes. By means of the scheme, by changing the compression ratio of the engine, the working efficiency of the engine can be improved, and oil consumption and emission are reduced.

Description

technical field [0001] The invention relates to the field of automobile engine manufacturing, in particular to an engine, an engine variable compression ratio mechanism and a control method thereof. Background technique [0002] The compression ratio of the engine refers to the degree to which the engine mixture is compressed. Specifically, it can be expressed by the ratio of the total volume of the cylinder before compression to the volume of the cylinder after compression. Since the volume of the combustion chamber and the working volume of the cylinder are usually defined in advance in the design, they are all fixed parameters, so the compression ratio of the existing automobile engine cannot be changed during the working process. [0003] However, this fixed compression ratio cannot make the engine perform better in various working conditions, and there are problems of high fuel consumption and emissions. Contents of the invention [0004] The problem solved by the em...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D15/04F02B75/32
Inventor 王京堂
Owner SAIC MOTOR
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