Automotive double-fuel system using natural gas

Abstract

The invention relates to an automotive double-fuel system using natural gas. The system comprises an engine, a natural gas supplying device, a natural gas timed injection distributor, a fuel injection pump, a lubricating device and a control device, wherein the natural gas supplying device is connected to the natural gas timed injection distributor; the natural gas timed injection distributor is arranged on the engine and is connected with the fuel injection pump; the lubricating device is connected with the natural gas timed injection distributor via a lubrication loop; the control device comprises a control instrument panel and an alarming machine. The system disclosed by the invention has the advantages that on the basis of an original diesel engine, the interior of the diesel engine is not changed, so the double-fuel system is simple to refit, high in fuel replacement rate, good in economical efficiency, simplified in control method, free of imported parts, practical, low in cost, simple to overhaul and maintain, low in maintenance cost, free of complicated programs of a natural gas electric control injection system and good in reliability of refitted parts.

Description

technical field [0001] The invention relates to the application field of natural gas, in particular to a dual-fuel system for vehicles using natural gas. Background technique [0002] Diesel vehicles using CNG / LNG generally use natural gas single-fuel vehicles, replacing the original diesel engine or refitting a natural gas engine on the basis of the original diesel engine. It cannot be used without a natural gas filling station during transportation, which limits the popularization and application of this technology. [0003] The more flexible way is to use diesel and natural gas dual-fuel vehicles. When there is no natural gas, it can run in pure diesel mode. When there is natural gas, diesel vehicles can also burn natural gas. [0004] The current diesel and natural gas dual-fuel vehicles all adopt the natural gas electronically controlled injection technology, which adds a set of high-pressure electromagnetic injection valves and ECU electronic control units to the natu...

AI Technical Summary

Problems solved by technology

[0004] The current diesel and natural gas dual-fuel vehicles all adopt the natural gas electronically controlled injection technology, which adds a set of high-pressure electromagnetic injection valves and ECU electronic control units to the natural gas electronically controlled injection gas supply system on the basis of the original diesel engine. There are the following disadvantages: the comprehensive oil replacement rate of natural gas is low (the oil replacement rate refers to the proportion of natural gas replacing diesel or gasoline), only 40-50%; the control method is complicated, imported components are used, and the modification cost is high; inspection and maintenance require professionals , high maintenance cost

Generally speaking, the economy is poor, and it is less attractive to diesel vehicle users

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