Variable compression ratio system of internal combustion engine, and internal combustion engine

Abstract

The invention discloses a variable compression ratio system of an internal combustion engine, and the internal combustion engine, and relates to the field of internal combustion engine auxiliary systems. The variable compression ratio system comprises an auxiliary connecting pipe, an auxiliary gas channel and a variable auxiliary gas valve; the auxiliary gas channel is formed in a gas cylinder cover connected with a gas cylinder and is connected with a gas inlet branch pipe through the auxiliary connecting pipe, the variable auxiliary gas valve is assembled in the auxiliary gas channel, and the maximum lift and the longest duration of the variable auxiliary gas valve correspond to 0.3-0.5 times of the maximum lift and the longest duration of a gas inlet valve; the variable auxiliary gas valve is driven by the variable gas valve system, and the variable gas valve system is connected with an ECU. Under the high-load steady working condition, the ECU can output a command to the variable gas valve of the variable gas valve system for timing controlling the variable auxiliary gas valve to be opened at the initial stage of compression; a specific proportion of mixture gas is stored between the auxiliary gas channel and a gas inlet channel for the next work cycle, and the effective compression ratio of the internal combustion engine is reduced; and the internal combustion engine comprises the variable compression ratio system of the internal combustion engine, and detonation of the internal combustion engine under the high-load steady working condition is prevented.

Description

Technical field [0001] The invention relates to the field of internal combustion engine auxiliary systems, in particular to an internal combustion engine variable compression ratio system and an internal combustion engine. Background technique [0002] Compression ratio refers to the degree of compression of the gas in the cylinder after the piston moves from bottom dead center to top dead center; EGR refers to the internal combustion engine that separates a part of the exhaust gas after combustion and introduces it to the intake side to re-burn. Multiple injection technology can change the trade-off relationship between conventional engine NOx and PM emissions. [0003] In order to improve fuel economy, prevent deflagration, and reduce engine exhaust pollution, researchers have proposed variable compression ratio, exhaust gas recirculation technology, and multiple injection technology. The variable compression ratio structure design is more complicated, and the internal EGR contro...

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Problems solved by technology

[0003] In order to improve fuel economy, prevent deflagration, and reduce engine exhaust pollution, researchers have proposed variable compression ratio, exhaust gas recirculation technology, and multiple injection technology. Among them, the structural design of variable compression ratio is relatively complicated, and the internal EGR control accuracy is limited What is lacking, the external EGR structure and controller are more complicated, and multiple injections have higher requirements on the system

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