System and method for controlling homogeneous charge compression ignition of internal combustion engine through water spray in cylinder

Abstract

The invention relates to a system and method for controlling homogeneous charge compression ignition of an internal combustion engine through water spray in a cylinder. The system for controlling homogeneous charge compression ignition of the internal combustion engine through water spray in the cylinder comprises an internal combustion engine body, oil sprayers, a direct-spray water sprayer, a water spray common rail, a high-pressure water pump and a water tank. The direct-spray water sprayer is connected to the water spray common rail. The water spray pressure in the water spray common railis established by the high-pressure water pump. The high-pressure water pump is driven by an internal communication engine crankshaft or cam shaft. The water adopted in the homogeneous charge compression ignition process of the internal combustion engine is stored in the water tank. The system for controlling homogeneous charge compression ignition of the internal combustion engine through water spray in the cylinder effectively solves the problem that when the homogeneous charge compression ignition technology is adopted under a large-load working condition, knockings exist, so that the homogeneous charge compression ignition can be utilized in the full load work range of the internal combustion engine, and the full load fuel economical efficiency and emission feature of the internal combustion engine are improved; and besides, after absorbing heat emitted in the ignition process, the water sprayed into the cylinder is gasified, expands and does work, the system thermal efficiency ofthe homogeneous charge compression ignition internal combustion engine is further improved, and control and optimization of the homogeneous charge compression ignition process of the internal combustion engine are achieved.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engines, and in particular relates to a system and a control method for controlling homogeneous compression ignition of an internal combustion engine by using water injection in a cylinder. Background technique [0002] As the energy consumption and emission problems of motor vehicles become more and more severe, governments and relevant agencies of various countries have introduced increasingly stringent fuel consumption and emission standards to maintain the healthy development of the motor vehicle industry. Under the above background, the homogeneous compression ignition technology of internal combustion engine came into being. Because of its characteristics of ultra-high thermal efficiency and extremely low pollutant emission, it has been widely concerned by academia and industry for a long time since its birth. After a long period of research and development work, the academic and...

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Problems solved by technology

Among them, the difficult problem of cold start can be solved by using SI-HCCI switching, that is, the spark plug is used to ignite the combustible mixture in the starting condition, and then gradually switched to the homogeneous compression ignition condition; the problem of high control accuracy can be solved by using a high-performance controller, cylinder Internal pressure sensor or ion current sensor and other technologies realize in-cylinder closed-loop feedback control to solve the problem of narrow load under homogeneous compression ignition conditions. The current solution is to weaken the degree of homogeneity of the combustible mixture, that is, by realizing partial homogeneity , partially heterogeneous stratified gas mixture, which undoubtedly weakens the efficiency and emission control effect of homogeneous compression ignition technology

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