Engine combustion system and control method thereof

Abstract

The invention discloses an engine combustion system and a control method thereof. The system comprises an engine body, an air inlet and exhaust system, a gasoline air channel injection system, an ethanol cylinder direct injection system, an ignition system, a variable valve system, an exhaust gas recirculation system and an electronic control unit; the engine body is connected with the air inlet and exhaust system, the ethanol cylinder inner direct injection system, the ignition system and the variable valve system, the air inlet and exhaust system is connected with the gasoline gas channel injection system and the waste gas recirculation system, the gasoline air channel injection system, the ethanol cylinder direct injection system, the ignition system, the variable valve system and the exhaust gas recirculation system are connected with the electronic control unit, and a high-geometric compression ratio is adopted by the engine body. Therefore, the gasoline and ethanol dual-fuel composite combustion is realized through the corresponding combustion mode, and the early combustion and detonation tendency of a large-load working condition region are inhibited, the low-speed torque and the power density of an engine are improved, and the combustion efficiency and the heat efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an engine combustion system and a control method for the engine combustion system. Background technique [0002] With the increasingly serious global environmental and ecological problems, the emission regulations and fuel economy standards for engines in countries around the world are becoming increasingly stringent. In recent years, supercharged engine technology and gasoline direct injection technology have been widely used in vehicle engines. Among them, supercharged engine technology can significantly increase the power density of the engine, improve the performance and fuel economy of the internal combustion engine; Injection technology can reduce the thermal atmosphere and improve the charging efficiency through direct injection gasoline vaporization heat absorption, effectively suppress the tendency of knocking or early ignition, and allow the use of higher compression ra...

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Problems solved by technology

[0003] However, the inventors have found through research that, compared with ordinary engines, due to the high degree of strengthening of the supercharged direct injection engine in the prior art, the peak combustion pressure and temperature in the cylinder will increase, resulting in Knock phenomenon occurs in the area of ​​heavy load condition, especially in the area of ​​low speed and heavy load condition, it is very easy to cause pre-ignition and super knock phenomenon, even through delayed ignition, enrichment, exhaust gas recirculation (English: Exhaust Gas Recirculation, abbreviation : EGR) and other conventional technical means have limited effect on suppressing the above-mentioned phenomenon, supercharged direct injection engine is very easy to cause pre-ignition and super knocking phenomenon in the low-speed and heavy-load working condition area, which becomes the biggest obstacle to limit the engine power density and low-speed torque promotion

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