Compression ignition internal combustion engine

Abstract

A compression-ignition internal combustion engine for conducting pilot injection and main injection beyond the top dead center, wherein pilot injection quantity and timing are optimized. A compression-ignition internal combustion engine, comprising a fuel injection valve for injecting fuel into a combustion chamber in a cylinder, the quantity and timing of the fuel injected through the fuel injection valve being controlled based on engine operating conditions; wherein pilot injection is carried out prior to the top dead center of compression, main injection is then carried out beyond the top dead center of compression, and fuel injection quantity and fuel injection timing of the pilot injection are set such that the maximum rate of heat release induced by the pilot injection is 60 kJ / s or less.

Description

technical field [0001] This invention relates to compression ignition internal combustion engines, and more particularly, to compression ignition internal combustion engines designed to clean exhaust gases by improving combustion characteristics. Background technique [0002] This application claims the benefit of Japanese Patent Application No. 2001-315289 filed on October 12, 2001 and Japanese Patent Application No. 2001-350138 filed on November 15, 2001, and the essential subject matter disclosed by them is hereby incorporated by reference In this application. [0003] Recently, the environmental requirements for internal combustion engines, especially diesel engines, have been increased, and there is an urgent need to improve exhaust gas. As a result, despite various aftertreatment technologies such as Diesel Particulate Filters (DPF) that collect black smoke and other types of soot and reduce and clean NO x NO x Catalytic converters are being significantly advanced, ...

AI Technical Summary

Problems solved by technology

[0011] Although this is helpful for reducing NO x Effective, but also exacerbated the black smoke problem, because before the main injection, a continuous combustion by the pilot injection occurs and as a result of the combustion by the pilot injection, black smoke is produced

[0012] As a result, it is difficult to improve the black smoke problem using these technologies, which cannot fully meet the strict regulations in the future

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