Fuel feeding system of micro diesel oil ignition direct-injection natural gas engine and control method thereof

Abstract

The invention discloses a fuel feeding system of a micro diesel oil ignition direct-injection natural gas engine and a control method of the fuel feeding system. The fuel feeding system comprises an electronic control common rail ignition diesel oil feeding device and an electronic control common rail high-pressure direct-injection natural gas feeding device, wherein the electronic control common rail ignition diesel oil feeding device and the electronic control common rail high-pressure direct-injection natural gas feeding device are independently controlled through an electronic control system,the electronic control system supplies ignition diesel oil with certain pressure to the natural gas engine in an adjusting mode by having control over a diesel oil pressure adjusting module of the electronic control common rail ignition diesel oil feeding device according to the working condition of the natural gas engine, and the electronic control system supplies main jet natural gas with certain pressure to the natural gas engine in an adjusting mode by having control over a natural gas pressure adjusting module of the electronic control common rail high-pressure direct-injection natural gas feeding device according to the working condition of the natural gas engine.Injection pressure of the ignition diesel oil and jet pressure of the main jet natural gas are controlled through the electronic control system, and the purpose of quick low-emission efficient combustion of the engine is achieved.

Description

technical field [0001] The invention relates to the technical field of in-cylinder high-pressure direct-injection natural gas engines, in particular to a fuel supply system for in-cylinder high-pressure direct-injection natural gas engines ignited by a trace amount of diesel oil and a control method for operating the fuel supply system. Background technique [0002] In recent years, natural gas as an alternative fuel has been paid more and more attention due to its advantages in price and reserves. The emission values ​​of engines using natural gas as the main fuel have been reduced, and it is easier to meet increasingly stringent emission regulations. However, due to the compression ratio of ordinary premixed combustion natural gas engines, the thermal efficiency is low and the power performance is lower than that of the same displacement due to the restriction of knocking. diesel engine. High-pressure direct-injection natural gas engines ignited with a trace amount of die...

AI Technical Summary

Problems solved by technology

At present, the injection pressure control method of this type of engine is single electronic control, and the ECU only controls the diesel rail pressure. The natural gas rail pressure is adjusted by a mechanical device to maintain a constant pressure difference with the diesel rail pressure, and the rail pressure cannot be adjusted according to the engine operating conditions. Flexible adjustment to limit the further improvement of the overall performance of the engine

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