A variable compression ratio engine and automobile

Abstract

The invention discloses a variable compression ratio engine and an automobile. A plurality of combustion chambers are formed between a cylinder head (1) and a cylinder block of the engine, and further comprises a driving motor (2) and a plurality of central pistons (3); The inside of the center piston (3) is provided with a fuel injection nozzle assembly (4) and a spark plug (5), the fuel injection end and the ignition end of which are located at the lower end of the center piston (3); the cylinder head (1) is provided with There is a piston cavity for installing each of the central pistons (3), the driving motor (2) is arranged on the cylinder head (1), and is connected with each of the central pistons (3) through a linkage part to drive the The central piston (3) moves up and down together, so that the lower end of the central piston (3) is embedded in or removed from each of the combustion chambers. The engine is controlled by the motor to change the volume of the combustion chamber to change the compression ratio of the engine, so that the engine can work in a stratified combustion mode, so as to improve the working efficiency of the engine.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to a gasoline engine with adjustable compression ratio. The present invention also relates to an automobile provided with said variable compression ratio engine. Background technique [0002] The compression ratio is the ratio of the scavenging volume of the piston to the combustion chamber volume and the combustion chamber volume. Increasing the compression ratio can improve the cylinder pressure and efficiency, but it is easy to cause knocking of the engine. Therefore, at low loads, it is hoped to increase the compression ratio to improve the combustion efficiency, and at high loads, it is hoped to reduce the compression ratio to prevent the occurrence of knocking and knocking. Improve efficiency. [0003] The combustion chamber of a modern engine is determined by the physical structure formed by the cylinder head and the top of the piston. Regardless of the engine di...

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Problems solved by technology

[0005] The current variable compression ratio technology is usually realized through variable combustion chamber volume and variable top dead center position. Changing the top dead center position often requires changing the crankshaft of the connecting rod and crankshaft to a four-bar linkage mechanism. At the same time, the control mechanism is added, and the other is to change the relative position of the cylinder head and the cylinder block to achieve variable combustion chamber volume, but this system brings a series of problems such as sealing, camshaft drive, lubrication and cooling.

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