A method for suppressing knocking of gasoline engine by direct injection of diesel in cylinder

Abstract

The invention discloses a method for restraining gasoline engine knock through direct injection diesel oil in a cylinder. The method comprises following steps: firstly, an ignition plug ignites a gasoline mixture, and enough high inner temperature and pressure can be formed by a combustion chamber; secondly, when a piston runs to the near top dead center, a diesel oil injector evenly sprays dieseloil to the combustion chamber circumferentially in a manner of being as umbrella-shaped fine particles, and the combustion chamber is full of diesel oil fuel; thirdly, the diesel oil fuel begins to self combustion, multi-point simultaneous sufficient combustion of the diesel oil fuel is achieved, and the tail end gas self combustion is restrained. The diesel oil fuel is subject to cylinder innerhigh pressure injection, multi-point self combustion is achieved, gasoline engine knock is restrained, the compression ratio can be further improved, the fuel oil economy can be improved, meanwhile, the popularization degree and the use technical means of the diesel and gasoline are mature, and the commercial foreground is good.

Description

technical field [0001] The invention relates to the technical field of designing internal combustion engines, in particular to a method for suppressing engine knocking, in particular to a method for suppressing gasoline engine knocking by in-cylinder direct injection of diesel oil. Background technique [0002] Internal combustion engines consume about 60% of my country's total oil, and are also the main source of greenhouse gases, air pollution and environmental noise. Compared with traditional engines, downsizing engines have great energy-saving and emission-reduction potentials. They have developed rapidly in the past ten years and are becoming the main energy-saving way for engines. With the improvement of high compression ratio and high boost technology, knocking will occur in small reinforced engines, which will cause high-frequency and severe pressure oscillations in the cylinder and cause irreversible damage to the mechanical structure. Therefore, knocking has becom...

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Problems solved by technology

[0004] At present, the conventional methods to suppress knocking mainly include: delaying ignition timing, reducing compression ratio and adopting exhaust gas recirculation system, etc. Delaying ignition and reducing compression ratio can obviously reduce the tendency of knocking, but the output power will decrease to a certain extent; Using dual-fuel systems such as methanol, hydrogen and other alternative fuels, the use of dual-fuel systems can generally significantly suppress the occurrence of knocking, and can also improve thermal efficiency to a certain extent, while maintaining the corresponding output power, but the popularity and industrialization of alternative fuels The outlook is not very optimistic, and there are certain problems in promoting the use of alternative fuels on a large scale

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