Thin-combustion, port-sequence-injection, fully electric-controlled diesel/natural gas electronic control system for dual-fuel engine

Abstract

The electronic control system of diesel oil / natural gas double fuel engine selects and uses Motorola MC68332 32 bit microprocessor, which comprises micronctroller module, digital collecting module, power drive and protection module, power supply module, communication module and display and alarm module. Said micrcontroller module comprises crystal oscillator, memory and reset chip, the data collecting module is formed from analog signal acquisition circuit, switching quantity signal acquisition circuit and pulse signal acquisition circuit, and the power drive and protection module comprises power drive tube and power grid drive chip, the power supply module adopts buck PWM switch power supply, the communication module adopts MAX202 chip and the display and alarm module comprises a triode and indicator light connected with it.

Description

[0001] Field: [0002] The invention belongs to an electronic control system, in particular to an electronic control system for a lean-burn, gas port sequential injection 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 plate flowmeters, 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 environmenta...

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, most of them use mechanical mixers or single-point electric control devices. The mechanical mixer is based on the principle of Venturi or orifice plate flowmeters, 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. With an intake valve, the part-load economy deteriorates

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