Method of controlling compression ignition of direct spray type gasoline engine by twice injection

Abstract

With two time sprays controls straight spurts executes the gasoline engine to reduce fire burning the method, this method through carries on in the cylinder two time fuel injection, forms the thick thin different lamination mixture air, first causes rich mixture kcarburettork the spontaneous combustion fire. Adjusts the time and the proportion which two time blows may control the lamination carburetion the time and the density, thus may adjust and control the HCCI burning the fire time and the reduction catches fire; At the same time, because has formed district order burning, thus may control, accurate. Indicated on the real engine experiment that, this method may enhance gasoline engine HCCI the burning stability, example NOx discharges is 0~230ppm, the comparatively same compound under gasoline engine reduces NOx to discharge above 95%, the non- carbon smoke discharges, the fuel oil consumption rate achieves the diesel engine level.

Description

technical field [0001] The invention relates to a method for controlling the compression ignition combustion of a direct-injection gasoline engine, in particular to a method for controlling ignition timing and ignition reliability when a gasoline direct-injection engine adopts a homogeneous mixed gas compression ignition combustion mode, and belongs to automobile engines and combustion engines of internal combustion engines. technology field. Background technique [0002] The homogeneous mixture compression ignition (HCCI) combustion method can significantly improve the combustion thermal efficiency of gasoline engines, reaching the level of ordinary diesel engines, and at the same time reduce NOx emissions by more than 95% compared with ordinary gasoline engines. It is currently a research hotspot in the world. However, the main difficulty in realizing this combustion method is how to precisely control the ignition moment and combustion rate to avoid misfire or rough combus...

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Problems solved by technology

However, these methods not only have low control accuracy, are sensitive to changes in working conditions, but also have problems such as slow response speed.

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