Sequential ejection, rare combustion, fully electronic controlled diesel/natural gas dual-fuel engine

Abstract

The device of injection hole for jetting natural gas in proper order is composed of the injection solenoid valve and the solenoid valve seat. The said device is installed at the air inlet of each cylinder of the engine. The proportion electro-magnet is installed at the injection pump with electronic control system being added. The gas path of natural gas consists of the high-pressure cylinder, the filter cleaner of natural gas and the pressure reducing valve of natural gas. The electronic control system includes the electronic control unit and the several sensors connected to the engine. The advantages of the invention are (1) simple modifying procedure, (2) discharge standard reaches Europe III, (3) high substitution rate of natural gas, (4) good acceleration and deceleration characteristics as well as steering ability, (5) timing control, definite quantity control for natural gas, and accuracy control for diesel oil, (6) high interference killing feature of the electronic control unit.

Description

[0001] Field: [0002] The invention relates to an automobile engine, in particular to a gas-port sequential injection, lean-burn, fully electronically controlled diesel / natural gas dual-fuel engine. Background technique: [0003] At present, domestically produced diesel / natural gas dual-fuel engines generally add a set of mechanical oil limiting devices to the diesel supply system of the original engine, which cannot precisely control the oil quantity and has poor emission indicators. In terms of natural gas supply, most of them use mechanical mixers or single-point electric control devices. The mechanical mixer is based on the principle of Venturi or orifice flow agent, and the natural gas control valve is pushed by a mechanical spring according to the air intake to complete the control of the natural gas supply. It is difficult for this device to accurately control the amount of natural gas and the excess air ratio when environmental factors change. In contrast, although t...

AI Technical Summary

Problems solved by technology

[0003] At present, domestically produced diesel / natural gas dual-fuel engines generally add a set of mechanical oil limiting devices on the basis of the diesel supply system of the original engine to control the amount of diesel oil, which cannot accurately control the amount of oil and has poor emission indicators.

In terms of natural gas supply, mechanical mixers or single-point electric control devices are mostly used. The mechanical mixer is based on the principle of Venturi or orifice flow agent, and the natural gas control valve is pushed by a mechanical spring according to the air intake to complete the control of natural gas supply. It is difficult for this device to accurately control the amount of natural gas and the excess air ratio when environmental factors change

In contrast, although the electronically controlled single-point injection mixer can accurately control the amount of natural gas, it also has the following defects as the mechanical mixer: 1. Due to the large difference in specific gravity between natural gas and air, the intake air in the intake manifold is divided. layer, the air-fuel ratio of the mixture between the cylinders is very different, prone to knocking and high emissions

2. For turbochargers and two-stroke machines, due to the large valve overlap angle, the scavenging short circuit is caused, which increases HC emissions

3. In order to burn natural gas at low load and reduce the intake air volume accordingly, a throttle valve should be installed on the intake passage, but the installation of the throttle valve will reduce the thermal efficiency of part load by about 20%

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