Diesel engine/natural gas dual-fuel engine electric control system

Abstract

The invention discloses a control method and a control device of a diesel/natural gas dual-fuel engine. The method is characterized in that that on the basis of maintaining an original engine control system, a diesel and gas control unit is added. Signals of all sensors of the original machine are shared by the dual-fuel control system and an electric control system of the original machine. The added dual-fuel control unit can control the injection of the diesel and an additionally-installed gas injection system (including a gas nozzle electromagnetic control, a gas switch valve control, gas liquid level or pressure monitoring and the like), and the added dual-fuel control unit can also process signals which are associated to the gas system. The injection volume and the oil injection moment of the diesel can be precisely controlled according to different working states of a diesel engine, and the injection time and the injection duration of the natural gas can also be controlled. The duel-fuel engine can be enabled to run safely and stably, the fuel consumption can be reduced, and the emission of tail gas can be reduced.

Description

technical field [0001] The invention designs an engine control technology, and in particular relates to a method and device for controlling oil and gas injection of a diesel / natural gas dual-fuel engine under the electronically controlled unit pump and common rail technology. Background technique [0002] With the increasingly tense oil resources, the world's fuel prices have soared again and again, and my country's oil prices have also risen again and again. The scientific development and mature application of clean energy diesel engines represented by natural gas can effectively reduce the use of heavy trucks. Alleviate the shortage of energy and solve the problems of emission pollution. In the existing diesel / natural gas dual-fuel control technology, a natural gas control system is usually added on the basis of the diesel engine and diesel control system. [0003] There are roughly three types of control of the amount of pilot fuel, that is, the in-line fuel injection pum...

AI Technical Summary

Problems solved by technology

[0005] The invention aims at the problem that the traditional diesel / natural gas dual-fuel engine oil gas control method and device cannot accurately control the amount of diesel oil and natural gas and the injection time, thereby affecting the safety and stability of engine operation, and provides a dual fuel engine oil gas The injection control method can accurately control the injection timing and injection duration of diesel and natural gas according to the different working conditions of the diesel engine, so as to ensure the safe and stable working state of the dual-fuel engine, reduce fuel consumption, and reduce the emission of harmful substances

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