Fuel supplying system of lpi engine

Abstract

A fuel supplying system of a liquid propane injection (LPI) engine, may include a fuel tank for storing fuel, a main fuel pump connected to the fuel tank and disposed at the exterior of the fuel tank, a fuel supply line connecting the main fuel pump and the engine to supply fuel from the main fuel pump to the engine, and a fuel return line connecting the engine and the interior of the fuel tank to return fuel from the engine to the interior of the fuel tank, wherein a sub-fuel pump is provided to the interior of the fuel tank and connected to the fuel supply line through a sub-fuel pump connecting pipe, the sub-fuel pump being operated when a predetermined condition is satisfied.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2009-0079450 filed on Aug. 26, 2009, the entire contents of which are hereby incorporated by reference for all purposes. technical field [0003] The present invention relates to a fuel supply system for a liquid propane injection (LPI) engine, and more particularly, to a fuel supply system for an LPI engine, which can improve maintenance performance and serviceability. Background technique [0004] The LPI engine includes an LPI fuel pump supplying fuel therein, thereby achieving stability in fuel supply performance when fuel is forcibly supplied thereinto. [0005] That is, the fuel pump is installed inside the fuel tank, and the forcibly supplied liquid LPG fuel is injected by the injector. [0006] The LPI engine is adapted to correspond to strict emission control, and can improve the start of the engine in winter while reducing the injection o...

AI Technical Summary

Problems solved by technology

[0011] However, since the conventional LPI fuel pump is installed inside the LPI tank for supplying fuel to the engine, in the event of failure of the fuel pump, after a gas extractor extracts high-pressure LPG fuel from the tank, it must be The tank was cut to replace the pump and the tank should be repaired afterwards

[0012] In this case, gas extraction is only allowed in designated establishments that comply with safety restrictions, resulting in long waits for customers

[0013] As a result, manpower for pumping gas is increased, causing complaints from customers, especially taxi drivers

[0014] Additionally, parts and material costs to compensate for fuel pump noise, vibration and vibration (NVH) repairs are expensive

[0015] In addition, since many parts are welded inside the fuel tank, thermal deformation of the fuel tank plate is caused, and scale is generated during the welding process that deteriorates the durability of the fuel pump.

[0016] Also, the problem is that repairs and inspections of LPI tanks are avoided by field workers due to safety concerns and discomfort caused by inhaling the gas

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