Electronic control fuel injection system with adjustable injection starting pressure for low-speed two-stroke diesel engine

Abstract

The invention relates to an electronic control fuel injection system with adjustable injection starting pressure for a low-speed two-stroke diesel engine, The electronic control fuel injection system with adjustable injection starting pressure for the low-speed two-stroke diesel engine comprises a high-pressure fuel supply module, a fuel injection valve, a fuel injector and a gas regulation control unit, wherein the high-pressure fuel supply module is used for providing high-pressure fuel with stable and reliable pressure; the fuel injection valve is connected with the high-pressure fuel supply module and used for controlling starting and stopping of fuel injection; the gas regulation control unit is used for providing driving gas, and the pressure of the driving gas is regulated in advance according to the need of the rotating speed or the load of the diesel engine and an injection starting pressure is set so that the control over the injection starting pressure is achieved; the upper portion of the fuel injector is connected with the gas regulation control unit, and the lower portion of the fuel injector is connected with the fuel injection valve; and when the pressure of the high-pressure fuel entering the lower portion of the fuel injector through the fuel injection valve exceeds the pressure of the driving gas in the gas regulation control unit, the fuel injector starts fuel injection at the preset injection starting pressure. The electronic control fuel injection system with adjustable injection starting pressure for the low-speed two-stroke diesel engine achieves the adjustability of the injection starting pressure, improves the response speed of a needle valve, ensures the stability of the fuel injection pressure, has the advantages of being simple in structure and wide in application range, and can be applied to different diesel engines.

Description

technical field [0001] The invention relates to an electronically controlled fuel injection system for a marine high-power low-speed two-stroke diesel engine, in particular to an electronically-controlled fuel injection system for a low-speed two-stroke diesel engine driven by electricity and gas and with adjustable injection pressure, and belongs to the technical field of diesel engines. Background technique [0002] Fuel injection and its supply system are the heart of a diesel engine, which has a major impact on the power, economy, mechanical load, thermal load, work reliability and durability of a diesel engine. For marine high-power low-speed two-stroke diesel engines, in order to meet the requirements of more and more stringent emission regulations, it is not only necessary to increase the fuel injection pressure, but also to have a flexible and adjustable fuel injection characteristic curve in each load range of the engine. In order to achieve the purpose of reducing ...

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Problems solved by technology

The pressure-time controlled electronically controlled fuel injection system is based on mechanical, hydraulic and electronic control technologies, adopts the principle of pressure-time fuel metering, and realizes fuel injection volume, injection Flexible control of oil pressure, fuel injection timing and fuel injection law. The electronically controlled fuel injection system is not limited by the speed of the diesel engine. The fuel injection pressure and fuel injection duration can be optimized according to the load and speed of the diesel engine, which can significantly improve the low speed However, due to the limitation of the mechanical structure of the fuel injector itself, such as springs, the injection pressure of the electronically controlled fuel injection system cannot be adjusted, which leads to the limited adjustment of the fuel injection rate during the fuel injection process of this type of system , and when the same fuel injection system operates under different loads, there will be different opening and closing speeds, which will affect the fuel atomization effect at the beginning of injection and in the later period

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