Patent ID: 8710971

Claim:
A control method of a Liquefied Petroleum Injection (LPI) lamp for an LPI vehicle, the method comprising: providing a Liquefied Petroleum Gas (LPG) switch that can stop fuel supply to an engine; checking whether the LPG switch has been turned on or off; if the LPG switch is off and the vehicle is in an ignition-on state, switching the LPI lamp on and off for blinking to inform a driver that the LPG switch has been turned off; and if the LPG switch is on, the LPI lamp is off, the engine has been started and the vehicle is in a common traveling mode, checking whether fuel pressure of a fuel line for supplying fuel to the engine has decreased to less than a reference pressure; switching the LPI lamp on and off, if the fuel pressure has decreased to less than the reference pressure, to inform the driver that an abnormal decrease of the fuel pressure has occurred; and checking, if the fuel pressure is above the reference pressure, whether a problem has occurred in an LPG switch circuit for activating the LPG switch, and switching the LPI lamp on and off for blinking to inform the driver if a problem has occurred in the LPG switch circuit.