Combustion system of spark-ignition engine

Abstract

A spark-igniting engine combustion system is provided, which comprises: an electric control unit ECU, a high energy spark coil, a spark plug, an engine cylinder head and a hemispherical combustion chamber. Wherein, the spark plug is matched with the engine cylinder head and is positioned on the latter; the electric control unit ECU controls the high energy spark coil to facilitate the spark plug producing electric spark, so as to realize ignition in the hemispherical combustion chamber; the engine cylinder head adopts double spark plug structure; the electric control unit ECU adopts two suites of independent energy storage and ignition modules being respectively connected with the high energy spark coil; the varied ignition control strategy is adopted to control the ignition by the double spark plug. The invention is able to ensure the cold start or successful ignition of engine, enhance the combustion velocity and the rate of flame spread, organize the movement of air flow in the combustion chamber and assure full combustion in the engine, thereby improving the thermal efficiency of the engine and reducing the emission of tail gas.

Description

technical field [0001] The invention relates to the technical field of spark ignition engines, in particular to a spark ignition engine capable of promoting the formation of fire nuclei in combustible mixtures under lean combustion conditions, ensuring successful ignition, and increasing combustion rate and flame propagation velocity. Combustion System. Background technique [0002] With the continuous progress and development of human society, motor vehicles play an important role in social economic development and human life. The energy consumption and emission environmental issues related to motor vehicles are important issues that society must face today. [0003] 1 is a partial sectional view of a cylinder head of a prior art spark ignition engine. [0004] Spark ignition engines are commonly used in motor vehicles, and spark ignition engines mostly use a single spark plug structure. As shown in FIG. 1 , a spark plug 2 is provided on one side of a cylinder head 1 of ...

AI Technical Summary

Problems solved by technology

When the engine rotates at a high speed, the engine cycle is very short, and the combustion duration of each cycle is correspondingly shorter. As a result, the use of single spark plug ignition will cause the fuel mixture to not be fully combusted, resulting in deterioration of emission indicators and changes in the combustion cycle. increase

[0005] Studies have shown that in the lean combustion process, the growth period of the early flame has a greater impact on the entire combustion duration cycle, making it more cyclical than the stoichiometric equivalent ratio combustion process, making the engine work rough and generating transient emissions. Therefore, the traditional ignition method cannot meet the requirements of lean combustion of the engine

However, the combustible mixture formed by high-energy ignition and high EGR cannot achieve the purpose of reducing emissions and improving thermal efficiency.

Images