Air cylinder achieving gasoline engine compression ratio continuous variation and work method thereof

Abstract

The invention discloses an air cylinder achieving gasoline engine compression ratio continuous variation and a work method of the air cylinder achieving gasoline engine compression ratio continuous variation. The air cylinder achieving gasoline engine compression ratio continuous variation comprises a first cavity and a control system. The first cavity is defined by an air cylinder cover, an air cylinder cushion and an air cylinder sleeve. A first piston is arranged in the first cavity. The upper portion of the cavity wall on one side of the first cavity is provided with a compression ratio adjusting mechanism. The compression ratio adjusting mechanism comprises a second cavity, a connection pipe enabling the first cavity and the second cavity to communicate, a second piston arranged in the second cavity and an executing mechanism which is connected with the second piston and capable of driving the second piston to move back and forth in the second cavity. The air cylinder cover is provided with an oil sprayer, a sparking plug and a knock sensor used for detecting knock of the air cylinder. The control system is connected with the knock sensor and the executing mechanism to form a closed-loop control system. The air cylinder can adjust the compression ratio of a gasoline engine according to use working conditions, a large compression ratio is adopted when the load is small, a small compression ratio is adopted when the load is large, knock is avoided, the thermal efficiency of the gasoline engine is improved, and therefore the purpose of saving oil is achieved.

Description

technical field [0001] The invention discloses a gasoline engine compression ratio continuously variable cylinder and a working method thereof, belonging to the technical field of gasoline engines. Background technique [0002] At present, the existing gasoline engine is provided with a plunger to change the compression ratio on the cylinder head, and the volume of the combustion chamber is changed, thereby changing the compression ratio. This structure has the following disadvantages: [0003] First, the plunger is set on the cylinder head. When the engine explodes, the high-pressure gas will have a large impact on the plunger, making it difficult to seal and poor in reliability; [0004] Second, the volume of the combustion chamber changed by the plunger participates in the combustion, and there is a combustion dead zone, which affects the combustion efficiency of the gas and has an impact on the emissions of the gasoline engine; [0005] Third, the cylinder bore of the g...

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Problems solved by technology

[0003] First, the plunger is set on the cylinder head. When the engine explodes, the high-pressure gas will have a large impact on the plunger, making it difficult to seal and poor in reliability;

[0004] Second, the volume of the combustion chamber changed by the plunger participates in the combustion, and there is a combustion dead zone, which affects the combustion efficiency of the gas and has an impact on the emissions of the gasoline engine;

[0005] Third, the cylinder bore of the gasoline engine is small, and there is no space on the cylinder head to arrange the plunger to change the compression ratio, especially on the four-valve gasoline engine with direct injection in the cylinder, the position of the fuel injector and the spark plug are relatively tight

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