A Multi-mode Combustion Organization Method for Natural Gas/Diesel Dual Fuel Engine

Abstract

The object of the present invention is to provide a kind of natural gas / diesel dual-fuel engine multi-mode combustion organization method, natural gas is sprayed into gas passage by described natural gas low-pressure injection system as low-reactivity fuel, carries out preliminary mixing with air in the intake passage, and then It enters the cylinder through the intake valve; as a high-reactivity fuel, diesel is directly injected into the cylinder by the high-pressure common rail fuel injection system. After the diesel spontaneously ignites, it ignites the mixture of natural gas and air to provide power for the engine. The invention realizes the multi-mode combustion of the natural gas / diesel dual-fuel engine under different working conditions through the independent or coordinated control of the high-pressure common rail fuel injection system and the natural gas low-pressure injection system, so that the engine runs more flexibly, and can avoid cold start difficulty and low load High THC emissions and high-load knocking problems, so as to achieve reliable operation of the engine and efficient and clean combustion.

Description

technical field [0001] The invention relates to an engine combustion method, specifically a dual-fuel engine combustion method. Background technique [0002] At present, traditional petroleum is still used as the main fuel for internal combustion engines, especially for ships, but increasingly scarce oil resources, increasingly serious environmental problems and increasingly stringent emission regulations all pose great challenges to the development of internal combustion engines for ships. Therefore, more and more scholars pay attention to finding clean alternative fuels and improving fuel utilization. Natural gas has become the most promising alternative energy source due to its advantages such as wide sources, high calorific value, and less pollution. Therefore, natural gas-diesel dual fuel is often used in compression ignition engines. [0003] However, the traditional combustion method of natural gas / diesel dual-fuel engine determines that there is a trade-off relatio...

AI Technical Summary

Problems solved by technology

Excessive natural gas substitution will also cause problems such as unstable combustion of the engine under small and medium loads, serious THC emissions, and knocking combustion under heavy loads, and improper control of the combustion phase will also cause rough engine work, deteriorating engine economy and emissions , thus limiting the combustion boundary of the dual-fuel engine

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