Method and apparatus for supplying fuel of LPG car having LPI system
First Claim
1. 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.
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Accused Products
Abstract
Disclosed is method and apparatus for supplying fuel of LPG car having LPI system. More particularly, the present invention generates a gas fuel injection signal based on a gasoline fuel injection signal and directly injects LPG fuel within a fuel tank to a combustion chamber using the generated gas fuel injection signal to drive an engine. Therefore, an engine can be easily changed, the manufacturing cost of a duel car of LPG and gasoline can be reduced, and the manufacturing process thereof can be simplified.
18 Citations
46 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for supplying fuel of a LPG car having an LPI system, the method comprising:
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(a) receiving an engine load condition by throttle location information and intake manifold input information, and transmitting data information predetermined according to injection time of a gasoline fuel compared to the received engine load condition to a LPG engine control unit; (b) the LPG engine control unit receiving the data information predetermined according to the injection time of the gasoline fuel, compensating 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, calculating the proportional constant information corresponding to the fuel injection time when the LPG fuel is supplied based on the compensated data information, and providing the calculated proportional constant information to the gasoline engine control unit; (c) a gasoline engine control unit calculating time information for controlling a plurality of injectors based on engine speed information provided from the outside, the injection time information of gasoline fuel in operation (a), and the proportional constant information in operation (b), and generating a pulse signal for controlling the plurality of injectors based on the time information to transmit the pulse signal to the LPG engine control unit; (d) the LPG engine control unit receiving 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 providing it to the plurality of injectors; and (e) supplying the LPG fuel to an 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, injecting the mixed LPG fuel through the plurality of injectors to a cylinder to drive an engine, and returning the fuel remaining in the plurality of injectors to the LPG fuel tank. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification