Marine medium-and-high-speed oil-gas double-electric-control dual-fuel engine

Abstract

The invention relates to a marine medium-high-speed oil-gas dual-electronic-control dual-fuel engine. The marine medium-high-speed oil-gas dual-electronic-control dual-fuel engine comprises a fuel high-pressure injection electronic-control combined pump, fuel injection electromagnetic valves and a natural gas injection system common rail pipe, wherein the fuel injection electromagnetic valves are arranged at the fuel outlet positions of plungers of all cylinders; the fuel injection time and the fuel quantity are controlled through a fuel control part in an oil-gas double-control ECU; each cylinder of the natural gas injection system common rail pipe is provided with a fuel gas injection electromagnetic valve respectively; opening and closing of the fuel gas injection electromagnetic valves are controlled through a fuel gas part in the oil-gas double-control ECU; and fuel gas is directly injected to a gas inlet of a cylinder cover through a corrugated pipe and a fuel gas injection pipe. Meanwhile, the invention discloses a working method of the marine medium-high-speed oil-gas dual-electronic-control dual-fuel engine. According to the working method, parameters such as required injection oil quantity and pulse width are automatically calculated according to hardware parameters of an electronic control pump hardware parameter ECU, and oil quantity correction is carried out based on the rotating speed and exhaust temperature difference, so that the rotating speed adjusting function of the engine is achieved.

Description

technical field [0001] The invention relates to the technical field of marine engines, in particular to a medium and high-speed oil-gas dual-electric control dual-fuel engine for marine applications. Background technique [0002] At present, the fuel supply of marine dual-fuel engines is generally controlled by mechanical pumps. For different engine loads and different working modes (fuel mode and dual-fuel mode), the engine can only adopt the same fuel supply advance angle, which cannot be performed independently. Combustion optimization leads to a low replacement rate of dual-fuel engines in the mechanical pump control mode, and poor emissions, which cannot meet the increasingly stringent emission limit requirements for marine engines. At present, mechanical pumps and electronically controlled pump dual-fuel engines generally use oil control and speed regulation. When the engine is in dual-fuel mode, the actual amount of injected fuel is small, resulting in fluctuations in...

AI Technical Summary

Problems solved by technology

[0002] At present, the fuel supply of marine dual-fuel engines is generally controlled by mechanical pumps. For different engine loads and different working modes (fuel mode and dual-fuel mode), the engine can only adopt the same fuel supply advance angle, which cannot be performed independently. Combustion optimization leads to a low replacement rate of dual-fuel engines in the mechanical pump control mode, and poor emissions, which cannot meet the increasingly stringent emission limit requirements for marine engines

At present, mechanical pumps and electronically controlled pump dual-fuel engines generally use oil control and speed regulation. When the engine is in dual-fuel mode, the actual amount of injected fuel is small, resulting in fluctuations in engine speed, and the engine cannot enter dual-fuel mode under low load. At the same time, it also limits the room for increasing the gas substitution rate in dual-fuel mode

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