LPG LIQUID INJECTION SYSTEM HAVING PRESSURE VARYING FUNCTION

摘要

An LPG liquid injection system is provided to achieve improved cold startability by increasing the LPG fuel pressure when the atmospheric temperature is low. An LPG liquid injection system includes a fuel tank(100) equipped with a fuel pump(500), an injector(200) having a fuel injection period determined by the control of a controller(300), a fuel supply line(SL) which connects an outlet of the fuel tank and an inlet of the injector and is equipped with a first shutoff valve(600), a pressure sensor(PS) which connects an outlet of the injector and an inlet of the fuel tank, and a fuel return line(RL) equipped with a fuel pressure regulator(700) for regulating the pressure of fuel. A relief valve is interposed between the fuel pressure regulator of the fuel return line and the fuel tank, and a bypass line is formed around the relief valve from the fuel return line. The bypass line is equipped with a second shutoff valve.