Patent ID: 7949460

Claim:
An apparatus for supplying gasoline and liquefied petroleum gas fuel of a liquefied petroleum gas (LPG) car having a liquefied petroleum gas injection (LPI) system, which is a direct LPG injection scheme, the apparatus comprising: a plurality of injectors which are formed at an intake manifold and inject one of gasoline fuel and LPG fuel to a cylinder to drive an engine; a gasoline engine control unit which receives an engine load condition, generates a gasoline fuel injection signal according to injection time of the gasoline fuel compared to the received engine load condition, calculates time information for controlling the plurality of injectors based on engine speed information and proportional constant information and generates a pulse signal for controlling the plurality of injectors based on the time information; a LPG engine control unit connected to the gasoline engine control unit, wherein the LPG engine control unit receives data information predetermined according to the gasoline fuel injection time, compensates for the predetermined data information to be in inverse-proportion to a fuel pressure exhausted from a LPG fuel tank according to a driving of a fuel pump formed within the LPG fuel tank, calculates the proportional constant information corresponding to the fuel injection time when the LPG fuel is supplied based on the compensated data information, provides the calculated proportional constant information to the gasoline engine control unit, and receives the pulse signal provided from the gasoline engine control unit to convert the signal to a gas fuel injection signal for driving the plurality of injectors and provide it to the plurality of injectors; and a LPG engine which (1) supplies the LPG fuel to the intake manifold to admix the LPG fuel with air supplied from the outside, the LPG fuel within the LPG fuel tank being exhausted by the fuel pump driven by the control of the LPG engine control unit (2), injects the mixed LPG fuel through the injectors to the cylinder to drive the engine, and (3) returns the fuel remaining in the plurality of injectors to the LPG fuel tank.