Method and device for controlling fuel-gas ratio of dual-fuel engine

Abstract

The invention discloses a method and a device for controlling the fuel-gas ratio of a dual-fuel engine. The method comprises the following steps that: an electronic control unit (ECU) of the dual-fuel engine determines the working state of a diesel engine and performs fault diagnosis according to an accelerator position signal, a water temperature signal of the diesel engine and a natural gas pressure temperature signal which are acquired, and accurately controls the ratio of diesel to natural gas according to a rotating speed signal of the diesel engine and an original fuel injection pulse width signal which are acquired. By the method and the device, the ratio of the diesel to the natural gas can be accurately controlled according to different working states of the diesel engine, so that the dual-fuel engine is safely and stably operated, and the consumption of fuels and the emission of tail gas are reduced.

Description

Technical field [0001] The invention relates to engine control technology, in particular to an electronically controlled unit pump, pump nozzle, and a method and device for controlling the oil / gas ratio of a diesel / natural gas dual fuel engine under common rail technology. Background technique [0002] In recent years, in order to reduce vehicle operating costs, save energy, and reduce environmental pollution from vehicle exhaust, countries around the world have developed new energy vehicles. Among them, diesel / natural gas dual-fuel vehicles that reduce fuel costs and exhaust emissions while ensuring the power of the original vehicle are developing rapidly. Natural gas has better fuel economy than diesel and has lower exhaust pollutant content. In the existing diesel / natural gas dual-fuel control technology, a natural gas control system is usually added to the diesel engine and diesel control system. The value of pilot fuel is a very important standard. The traditional method i...

AI Technical Summary

Problems solved by technology

[0009] The invention aims at the problem that the traditional diesel / natural gas dual-fuel engine oil-gas ratio control method and device cannot accurately control the ratio of diesel oil and natural gas, thereby affecting the safety and stability of engine operation, and provides a dual-fuel engine oil-gas ratio The control method can accurately control the ratio of diesel and natural gas according to the different working conditions of the diesel engine, so as to ensure the safe and stable working condition of the dual-fuel engine, reduce fuel consumption and reduce exhaust emissions

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