Gas jet device of electric control jet lean-burn natural gas engine and jet control method

Abstract

The invention provides a gas jet device of an electric control jet lean-burn natural gas engine and a jet control method. The gas jet device comprises a large flow natural gas nozzle, the nozzle is arranged on a cylinder cover or an air intake manifold, the lower part of the nozzle is provided with a draft tube, the inside diameter of the draft tube is the same as the inside diameter of a nozzle outlet, the center line of the draft tube and the center line of an intake valve are two spatial straight lines which are not mutually parallel or intersected, and post gas pulse in the air intake process passes through an annular gap between the intake valve and a valve seat and is directly sprayed into a cylinder. Through the gas jet control method, mixed gas concentration layers are formed from the top down in the cylinder to ensure reliable combustion of the engine; and the jet pulse is directly sprayed into the cylinder to convert self kinetic energy into turbulent energy in the cylinder so as to quicken the combustion process of the natural gas engine and expand the lean-burn limit of stable running of the engine, thereby improving the dynamic property, economical efficiency and emission performance of the natural gas engine.

Description

(1) Technical field [0001] The invention relates to an engine injection device, in particular to an electronically controlled injection fuel gas injection device for a lean-burn natural gas engine. The invention also relates to an injection control method based on a gas injection device for an electronically controlled injection lean-burn natural gas engine. (2) Background technology [0002] Due to the low combustion temperature of the lean-burn natural gas engine, NOx emissions are controlled during the combustion process. At the same time, the lean-burn engine can reduce the pumping loss at part load, allowing the use of a larger compression ratio and supercharging technology, and the engine can produce more High power output and thermal efficiency, while the thermal load is equivalent to that of diesel engines, therefore, the development of lean-burn natural gas engine technology is an important technical measure to meet the strict fuel economy and emission regulations i...

AI Technical Summary

Problems solved by technology

However, this structure only guides the natural gas to the entrance of the intake valve. The natural gas is mixed with air in the air passage before entering the cylinder. Since the high-pressure injected natural gas itself has a high enthalpy value, if the gas jet directly hits the intake valve The surface or the wall of the intake port will cause the loss of gas jet motion energy, which is extremely unfavorable for improving the combustion quality of lean-burn engines, extending the stable operating limit and reducing engine emissions

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