A method for suppressing super-knock of a supercharged gasoline engine by dual-fuel injection

Abstract

The invention relates to the technical field of internal combustion engines, in particular to a method for suppressing super knocking of a supercharged gasoline engine by dual fuel injection. The dual-fuel injection suppresses the super-knocking method of a supercharged gasoline engine. Gasoline is injected into the intake port of the engine, and alcohol fuel is injected one or more times in the combustion chamber. The alcohol fuel with a high latent heat of vaporization is injected during the intake stroke to reduce the intake air. The temperature can increase the charge coefficient and improve the power performance; the compression stroke injection can reduce the temperature of the mixture gas at the end of compression and effectively suppress the early combustion; The sub-injection effectively suppresses super-knocking of supercharged small-displacement gasoline engines, thereby providing important support for engine energy saving and emission reduction. At the same time, the system only needs to install a set of intake port injection nozzles on the existing supercharged gasoline engine, which is low in cost, provides strong support for the technical upgrading of existing engine products, and has a good industrialization prospect.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a method for suppressing super knocking of a supercharged gasoline engine by dual fuel injection. Background technique [0002] The automobile industry is an important part of my country's economic structure, and most passenger cars use gasoline engines as their power source. Compared with traditional engines, direct-injection supercharged downsizing engines have great potential for energy saving and emission reduction. In the past ten years, they have made great progress and are becoming the main energy-saving way for engines. However, with the supercharging and small displacement technology, the engine is prone to an abnormal combustion phenomenon that is extremely harmful to the engine and has not been fully understood so far—super knocking. Volkswagen calls it Unwanted pre-ignition [1] , called Mega Knock by AVL [2] , which IFP researchers call pre-igni...

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Problems solved by technology

[0011] The purpose of the present invention is to provide a method for suppressing super-knock of a super-knock of a super-knock of a super-knock of a super-knock of a super-knock of a super-knock of a super-knock of a super-knock of a super-knock of a super-knock in order to overcome the super-knock of a super-knock of a super-knock of a super-knock of a super-knock that the super-knock takes place in order to overcome

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