In-cylinder direct injection double-gas-fuel internal combustion engine capable of realizing ultra-lean combustion and control method

Abstract

The invention relates to an in-cylinder direct injection double-gas-fuel internal combustion engine capable of realizing ultra-lean combustion and a control method, aims to solve the problems that combustion is unstable in an ultra-lean-combustion mode of a gas fuel spark ignition type internal combustion engine, the oil consumption is high and emission is heavy under the work conditions of cold start and small load and the like and develops a spark ignition type in-cylinder direct injection double-gas-fuel internal combustion engine capable of realizing ultra-lean combustion and a control method of the internal combustion engine. The internal combustion engine adopts an internal combustion engine technology combining in-cylinder direct injection and gas inlet channel injection based on double gas fuel, the internal combustion engine is provided with a gas flow control device which cooperates with a piston roof in a special shape, and accordingly, good mixed gas layering is realized. According to the special combustion characteristic of gas fuel, ultra-lean mixed gas in higher compression ratio can be adopted; gas flow movement of the mixed gas entering a cylinder is controlled, meanwhile, gas inflow is increased, ultra-lean combustion of the mixed gas in the cylinder is realized, the heat transfer loss is reduced, the heat efficiency is improved, and oil consumption and pollutants are reduced.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to an ultra-lean combustion direct-injection dual gas fuel internal combustion engine. It is suitable for vehicles with direct-injection ignition internal combustion engines with ultra-lean mixture gas and high compression ratio gas fuel. Background technique [0002] With the depletion of traditional fossil energy and the rapid development of the automobile industry, the harmful gases emitted by automobiles after burning fossil fuels have caused more and more serious and irreversible pollution to the environment, posing a huge threat to human living environment and health. Therefore, we are looking for high-quality Alternative fuels for automobiles are gradually being valued by countries all over the world, and the country and the automobile industry have increasingly strict technical requirements for high-efficiency and energy-saving automobile internal combust...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of high fuel consumption and high pollution level of the current in-cylinder direct injection gasoline engine under cold start and light load conditions, and the combustion characteristics of gasoline fuel limit the further improvement of the air-fuel ratio, and it is difficult to further expand the lean burn limit, etc. question

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