System for preventing fuel leakage for LPI injector

Abstract

Disclosed is a system for preventing fuel leakage for LPI injector, in the system, when the engine is stopped and the cut solenoid valve is closed, the LPG gas can be discharged to the outside for collecting, then the leak of LPG gas through a nozzle tip of the injector can be prevented. The system for preventing fuel leakage for LPI injector according to the present invention includes: an exhaust nipple leading to the outside is connectedly installed long on a gas holding part for holding LPG gas when a cut solenoid valve is closed in the injector, and a cutoff solenoid valve to open and close an exhaust hose while being controlled by an electronic control unit (ECU) is installed on the exhaust hose connected to the exhaust nipple. A collecting means adsorbing and storing LPG gas discharged through the cutoff solenoid valve is arranged at the rear of the cutoff solenoid valve.

Description

technical field [0001] The present invention relates to a system for preventing fuel from leaking through a nozzle tip of an injector by a cut-off solenoid valve when the engine is stopped in an LPI (Liquefied Petroleum Injection) vehicle, and more particularly, to a fuel prevention system for an LPI injector. Leakage system in which LPG (Liquefied Petroleum Gas) gas filled in the gas reservoir inside the cut-off solenoid valve is discharged to the outside for collection when the engine is stopped and the cut-off solenoid valve is in a cut-off state, thereby preventing LPG gas Leakage occurs through the nozzle tip of the injector. Background technique [0002] Generally, an LPG engine is equipped with a system in which fuel supplied from a high-pressure container, that is, an LPG tank, is vaporized by a mixer and a carburetor and supplied to the engine. [0003] However, this system using a mixer and a carburetor has several problems as follows. It is difficult to precisel...

AI Technical Summary

Problems solved by technology

However, when the engine actually starts and then stops, the temperature of the injector and the cut solenoid valve portion suddenly rises, so the pressure inside the cut solenoid valve also increases.

As a result, it is difficult to maintain airtightness at the seat portion of the cut solenoid valve, resulting in leakage of gas from the nozzle head 12 of the injector 10 into the combustion chamber of the engine.

[0013] This gas leak damages the starting performance of the engine and contributes to the increase in exhaust gas

[0014] In addition, in order to control the cut-off solenoid valve, a strong electric power is required and the size of the solenoid coil must be increased, which causes inconvenience in installation

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