Natural gas engine combustion organization method with natural high-low pressure mixed jet and diesel oil micro jet ignition of pre-combustion chamber

Abstract

The invention aims to provides a natural gas engine combustion organization method with natural high-low pressure mixed jet and diesel oil micro jet ignition of a pre-combustion chamber. In a low loadworking condition, the amount of natural gas directly jetted under high pressure by a high-pressure natural gas jet valve accounts for more than 50% the total amount of natural gas jet by each circle, and the diesel oil jet timing is 15-25 degrees CA before the top center; in a medium load working condition, the amount of natural gas premixed through air intake of an air intake manifold accountsfor 60-70% the total amount of natural gas jet by each circle, and the diesel oil jet advance angle is 10-20 degrees CA before the top center; and in a high load working condition, the amount of natural gas premixed through air intake of the air intake manifold accounts for 80-90% the total amount of natural gas jet by each circle, and the diesel oil jet timing is 5-15 degrees CA before the top center. The method achieves control over the concentration layered gradient of mixed gas inside a cylinder, overcomes the defect that an engine cannot have the emission performance and dynamic propertyat the same time under different working conditions, and improves the emission performance of the natural gas engine under the different working conditions.

Description

technical field [0001] The invention relates to a combustion control method, in particular to a natural gas engine combustion control method. Background technique [0002] Due to the increasing depletion of traditional petroleum fuels, natural gas, an efficient and clean fuel, has gradually been valued by countries all over the world. Although natural gas has the advantages of high efficiency, cleanliness and low price, since the ignition point of natural gas is higher than that of gasoline, diesel and other fuels, the energy required to ignite natural gas is relatively high, and the flame propagation speed is relatively low, thereby reducing the combustion efficiency of the engine. Affects engine emissions and power. [0003] Typical electronically controlled multi-point injection natural gas engines, such as the OM352 natural gas engine modified by the American SPI company for Benz, and the MAN28 / 32 natural gas engine of the German MAN company, etc., inject natural gas in...

AI Technical Summary

Problems solved by technology

However, for medium and high load conditions, the emission performance of the direct injection natural gas engine is relatively poor

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