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 fromthe 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 lean burn natural gas engine gas injection device. The invention also relates to an injection control method based on an electronically controlled injection lean burn natural gas engine gas injection device. (2) Background technology [0002] Due to the low combustion temperature of the lean-burn natural gas engine, NOx emissions can be controlled during the combustion process. At the same time, the lean-burn engine can reduce the pumping loss of part-load, allowing the use of larger compression ratio and boosting technology, and the engine can produce more High power output and thermal efficiency, and 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 future strict fuel economy and emission regulations. However, as the mixture ...

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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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