Burning controlling method for realizing switching of burning mode on direct injection petro engine

Abstract

The inventive method consists in: changing the different distribution schemes in a work cycle of engines by using a distribution phase rapid switching device of the petrol engine, and meanwhile having the different fuel-injection schemes; using the induction and compression strokes two-stage fuel injection in the ignition mode; using the induction, compression and exhaust strokes end three-stage fuel injection in the switching process and using the induction and exhaust strokes end two-stage fuel injection in the compression ignition mode to guarantee the normal combustion in all kinds of combustion modes.

Description

technical field [0001] The invention relates to a method for controlling the switching of combustion modes of a direct-injection gasoline engine, in particular to a method for controlling the rapid, smooth and reliable switching between a homogeneous mixed gas compression ignition combustion mode and a spark ignition combustion mode for a gasoline direct-injection engine, belonging to automobile engines , Internal combustion engine combustion 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 load range of this combustion method is small. Although it can meet the requirements of daily medium and low-speed cruising and most u...

AI Technical Summary

Problems solved by technology

These systems can switch between two gas distribution strategies in one cycle, but the control is complicated, the cost is extremely high, and some problems such as noise and reliability have not been solved, and the market prospect is unclear

[0005] In addition, during the switching process of the combustion mode, due to the common use of intake port injection in foreign countries, the response is slow. During the switching process, knocking and misfires are likely to occur due to poor oil-gas coordination, and the power output also fluctuates to a certain extent, which affects the driving performance.

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