Multiple-injection control method for fuel supply device of natural gas engine

Abstract

The invention relates to a fuel gas injection method for natural gas engines, in particular to a multiple-injection control method for a fuel supply device of a natural gas engine. The method includes that the natural gas engine is a four-stroke engine, and each working cycle of the natural gas engine includes four stages; the fuel supply device of the natural gas engine is arranged on the lateral side of a gas inlet, and natural gas and air are mixed for combustion in a cylinder; multiple-injection control of the fuel supply device is realized by adjusting injection times and quantity of natural gas supplied by the fuel supply device in a crank angle range from 2400 before top dead center of compression stroke of an engine piston to 2400 after top dead center of compression stroke of the engine piston. Aiming at different engine load conditions, stability in ignition of engines is guaranteed by means of partial stratification, flame propagation velocity is increased, and firing stability is improved.

Description

technical field [0001] The invention relates to a gas injection method for a natural gas engine, in particular to a multiple injection control method for a fuel supply device for a natural gas engine. Background technique [0002] With the substantial increase in the number of automobiles in our country, a large number of limited oil resources have been occupied, and the degree of air pollution has also been aggravated, posing double challenges to our country's oil resources and the environment. With the call and advocacy of energy saving and emission reduction, it is necessary to vigorously develop and use energy-saving and clean fuel vehicles to reduce motor vehicle pollutant emissions. [0003] Natural gas is recognized by the world as the most realistic and technologically mature alternative fuel for gasoline and diesel for vehicles. It has good emission characteristics and hardly produces particulate emissions. Compared with gasoline and diesel, this fuel can greatly re...

AI Technical Summary

Problems solved by technology

Although heavy-duty natural gas engines are mostly developed on the basis of diesel engines, due to the essential differences between general natural gas engines and diesel engines in fuel supply devices and ignition methods, natural gas engines are mostly ignited by intake port injection sparks, while natural gas engines have stable ignition Poor performance and slow flame propagation speed determine that the concentration distribution of natural gas in the engine piston cylinder must be changed to improve the combustion effect of the natural gas engine in the engine cylinder

[0006] At present, the traditional natural gas engine fuel supply method is to install a natural gas nozzle on the side of the intake valve and perform a single injection into the intake valve. The injection method of the single injection makes the mixture gas in the cylinder appear lean at the top and rich at the bottom during ignition. Distribution, during ignition and combustion, the flame of natural gas combustion cannot spread stably, and the combustion is insufficient, which affects the power performance and clean emission of the engine

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