1. Field of the Invention
The present invention relates to an LPI fuel supply system. More particularly, the present invention relates to an LPI fuel supply system that securely supplies an engine with fuel from a fuel tank.
2. Description of Related Art
Generally, a liquefied petroleum injection (LPI) engine uses an injector to inject liquefied fuel into a cylinder.
The operation principle of the LPI engine is schematically explained as follows: an electronic control unit (ECU) receives input signals from sensors to detect the condition of the engine and controls a fuel pump, the injector, and an ignition coil so as to optimize air/fuel ratio and engine performance.
That is, the fuel pump is controlled according to the fuel amount that is necessary to supply liquefied fuel to the engine, and the injector sequentially injects the fuel into the cylinders to realize an optimized air/fuel ratio.
The LPI system that is provided to the LPI engine includes a fuel pump that is disposed inside or outside the fuel tank so as to supply the liquefied fuel to the engine.
If the fuel pump supplies the fuel with uniform flux, the injector injects the liquid fuel. Here, the pressure regulator is disposed so as to uniformly sustain the pressure that is applied to the injector. If the pressure that is formed in the supply line is higher than a control pressure, the passage of the pressure regulator is opened to return the fuel to the fuel tank.
However, when the fuel pump is deteriorated or foreign substances are accumulated in the main filter of the fuel pump, there is a problem that the supply capacity of the pump becomes weakened.
The information disclosed in this Background of the Invention section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.