KR101759490B1 - Fuel feed control apparatus and method of altered vehicle using both gasoline and lpg - Google Patents

Abstract

The present invention relates to a fuel supply control device and a control method for a gasoline and an alpine modifying vehicle, and more particularly to a fuel supply control device and a control method of a gasoline and an alpine remodeled vehicle which are provided with a gasoline supply section for supplying gasoline fuel to an engine, an LPG supply section for supplying LPG to the engine, A high pressure pump that pressurizes the LPG fuel to a predetermined high pressure and a control unit that controls the driving of the LPG fuel pump installed in the cylinder on the basis of the pressure of the fuel supplied to the high pressure pump and the pressure of the LPG filled in the cylinder A control unit for controlling driving of the LPG fuel pump is provided in a vehicle modified to use gasoline and LPG in the gasoline direct injection system so that the driving of the LPG fuel pump can be controlled in accordance with the running state of the vehicle Effect is obtained.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fuel supply control apparatus and a control method for a gasoline and an LPG modified vehicle,

The present invention relates to a fuel supply control device and a control method for a gasoline and an LPG modified vehicle, and more particularly, to a fuel supply control device and a control method for a gasoline engine and a modified version of an LPG in a vehicle modified to use gasoline and LPG To a fuel supply control device and a control method of a gasoline and an alpine remodeled vehicle.

Generally, among the fuels used in vehicles, the LPG has a feature of high octane number and excellent heat resistance, and an advantage of low fuel cost, so that it is used in passenger cars, vans and the like, and is also applied to large vehicles.

When the gasoline is supplied to the engine of the vehicle, it is liquid, and when it is vaporized, it is mixed with the air and the flammability is set. Therefore, knocking does not occur more easily than gasoline and diesel. Vapor-lock or percolation It is possible to prevent the occurrence of the same phenomenon, and the range of application as an alternative fuel for gasoline or diesel fuel is gradually increasing.

Therefore, gasoline and LPG vehicles are equipped with gasoline fuel tanks, Vaporizers and mixers, Elfie fuel tanks, solenoid valves to control the supply of LPG fuel, and electronic control units to control solenoid valves ).

In recent years, in order to improve the output of the engine and to reduce the emission of contaminants, a gasoline direct injection engine (hereinafter referred to as "Gasoline Direct Injection") which injects only air into the engine and compresses the gasoline, (Hereinafter referred to as " Liquefied Petroleum Injection ") type direct injection type ELFIA engine is being developed.

Accordingly, in order to achieve both of environmental protection and fuel consumption reduction which are gradually strengthened, development of a fuel supply control device for a gasoline, an LPG, and a gasoline LPG using a direct injection method is under development.

For example, the present applicant has filed and filed a fuel supply control device technology of a direct injection type ELFI system and an ELFIGO gasoline vehicle in many of the following Patent Documents 1 and 2 and the like.

Korean Patent Registration No. 10-1261836 (issued on May 7, 2013) Korean Patent Registration No. 10-1261831 (issued on May 8, 2013)

However, in the case of retrofitting a vehicle in which a conventional gasoline direct injection engine is applied to both gasoline and LPG fuel, it is impossible to modify the program of the electronic control unit for controlling the driving of the gasoline fuel supply device, A separate driving logic is needed.

Accordingly, when a vehicle to which a gasoline direct injection engine is applied is modified to use both gasoline and LPG, a technique for driving the fuel pump in accordance with the driving state of the vehicle and the operating state of the fuel supply system is required.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a gasoline-and-elasto-refurbished vehicle which is adapted to convert gasoline and liquefied fuel into gasoline and LPG And a control method thereof.

Another object of the present invention is to provide a fuel supply control device and control method for a gasoline and an alpine modifying vehicle which controls the driving of the fuel pump so as to keep the pressure of the fuel supplied from the cylinder and the pressure difference of the fuel supplied from the regulator to the high- Method.

It is still another object of the present invention to provide a fuel supply control device and a control method of a modified gasoline and LPG vehicle, which can prevent the engine from being stalled and turned off due to vaporization of the LPG fuel by heat of the engine.

In order to achieve the above object, a fuel supply control apparatus for a gasoline and an LPG modified vehicle according to the present invention includes a gasoline supply unit for supplying gasoline fuel to an engine, an LPG supply unit for supplying LPG to the engine, A high-pressure pump for pressurizing the gasoline fuel or the LPG fuel supplied from the LPG supply unit to a predetermined high pressure, and a pressure sensor for detecting the pressure of the fuel supplied to the high-pressure pump and the pressure of the LPG And a control unit for controlling the driving of the motor.

The present invention further includes a sensing unit for sensing a first pressure and a second pressure of each fuel stored in the gasoline tank and the cylinder, and a third pressure of the fuel supplied to the high-pressure pump, and the sensing unit is installed in the gasoline tank A first pressure sensor for sensing the first pressure, a second pressure sensor installed in the bomb or inside the multi-valve for sensing the second pressure, and an elastomer feed line connected between the bomb and the high pressure pump And a third pressure sensor for sensing the third pressure, wherein the control unit controls the driving of the LPF based on the pressure difference between the second pressure and the third pressure sensed by the second and third pressure sensors .

The gasoline supply unit includes a gasoline tank in which gasoline fuel is stored, a gasoline fuel pump that pumps the gasoline fuel stored in the gasoline tank, a gasoline supply line that supplies the gasoline fuel pumped from the gasoline fuel pump to the high- And a gasoline pump controller for controlling the driving of the gasoline fuel pump so as to maintain a constant pressure difference between the first pressure and the third pressure, Wherein the gasoline pump controller controls the rotational speed of the motor provided in the gasoline fuel pump so as to maintain the pressure difference between the first pressure and the third pressure detected by the first and third sensors at a predetermined reference pressure difference .

The liquefied petroleum fuel supply system according to any one of claims 1 to 3, wherein the liquefied petroleum fuel is supplied to the high pressure pump and the pressure of the fuel recovered in the high pressure pump And a second valve for selectively blocking the LPF recovered from the high-pressure pump, wherein the control unit controls the pressure difference between the second and third pressures and the preset reference pressure And the controller controls the motor so that the reference pressure difference is maintained by increasing or decreasing the rotation speed of the motor provided in the LPF based on the comparison result.

The control unit drives the LPF at a predetermined initial rotation speed for a preset initial time set at the time of starting the engine in the LPF mode and drives the LPF at a preset minimum rotation speed while the ignition key is on Characterized in that

In order to achieve the above object, a fuel supply control method for a gasoline and an LPG modified vehicle according to the present invention comprises the steps of: (a) when power is supplied by the ignition key on operation, Pressure fuel pump to the high-pressure pump and the high-pressure fuel rail; (b) when the initial set time has elapsed, the control unit sets the LPF at a preset minimum rotation speed (C) sensing a first pressure of the fuel filled in the cylinder in the sensing portion and a second pressure of the fuel supplied to the high pressure pump by the pumping action of the LPF, and (d) The control unit controls the rotation speed of the LPF so that the pressure difference between the first and second pressures detected by the control unit maintains a predetermined reference pressure difference It is characterized by including the steps:

Wherein the step (a) comprises the steps of: (a1) inspecting a shortage of gasoline fuel stored in a gasoline tank in an ECU of a vehicle, (a2) (A3) when the gasoline is in a normal state as a result of the checking in the step (a1), the gasoline pump controller sets the gasoline fuel pump to the maximum rotation speed during the initial set time The method comprising the steps of:

Wherein the step (d) includes the steps of: (d1) comparing a pressure difference between the first and second pressures with the reference pressure difference; and (d2) comparing a pressure difference between the first and second pressures And increasing the rotational speed of the fuel pump to a rotational speed corresponding to any one of a plurality of predetermined stages if the reference pressure difference is larger than the reference pressure difference.

(E) when the gasoline mode is switched to the gasoline mode, the pressure difference between the third pressure of the gasoline fuel stored in the gasoline tank and the second pressure of the gasoline fuel supplied to the high pressure pump in the gasoline pump controller is constant And controlling the driving of the gasoline fuel pump so as to maintain the gasoline fuel pump.

As described above, according to the fuel supply control device and control method of the modified gasoline and LPG vehicle according to the present invention, the driving of the LPG fuel pump is controlled on the vehicle modified to use both gasoline and LPG in the gasoline direct injection system It is possible to provide the effect that the driving of the LPF can be controlled in accordance with the running state of the vehicle.

According to the present invention, by controlling the driving of the fuel pump so as to keep the fuel pressure supplied from the cylinder at the time of the LP mode and the pressure difference between the fuel supplied to the high-pressure pump from the regulator constant, And the fuel efficiency can be improved by optimizing the timing.

Further, according to the present invention, in the ignition key on state, the fuel pump is always driven at a predetermined minimum rotational speed or higher, thereby preventing the engine from being stalled and started from being ignited due to vaporization of the LPF Can be obtained.

1 is a configuration diagram of a fuel supply control apparatus for a modified gasoline and LPG vehicle according to a preferred embodiment of the present invention,
FIG. 2 is a flowchart for explaining steps of a fuel supply control method of a fuel supply control apparatus of a modified gasoline and LPG vehicle according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a fuel supply control apparatus and a control method of a modified gasoline and LPG vehicle according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a fuel supply control apparatus for a modified gasoline and LPG vehicle according to a preferred embodiment of the present invention.

First, a description will be given of a case where the present invention is applied to a vehicle that is modified to use a direct gasoline direct injection engine as a direct injection type fuel injection system for a vehicle in which an existing gasoline direct injection type engine is used.

Accordingly, the modified gasoline and LPG vehicle is provided with a gasoline supply unit 20 such as a conventional gasoline tank 21, a gasoline fuel pump 22 and a gasoline supply line GS, a high-pressure pump 11, a high-pressure fuel rail 12, , And an injector (not shown) are provided.

1, the fuel supply control apparatus 10 for a gasoline and LPG modified vehicle according to a preferred embodiment of the present invention includes a gasoline supply unit 20 for supplying gasoline fuel to an engine (not shown) A high pressure pump 11 and a high pressure pump 11 for pressurizing the gasoline fuel or the LPG fuel supplied from the gasoline supply unit 20 or the LPG supply unit 30 to a preset high pressure, an LPG supply unit 30 for supplying LPG to the engine, ) 32 based on the pressure of the fuel supplied to the cylinder 31 and the pressure of the LPF filled in the cylinder 31 to control the driving of the LPF 32 And a control unit 50.

In addition, the fuel supply control apparatus 10 of the modified gasoline and LPG vehicle according to the preferred embodiment of the present invention controls the fuel pressure of each fuel stored in the gasoline tank 21 and the cylinder 31 (Second pressure), and a pressure of the fuel supplied to the high-pressure pump 11 (third pressure).

The gasoline supply unit 20 includes a gasoline tank 21 that stores gasoline fuel, a gasoline fuel pump 22 that pumps the gasoline fuel stored in the gasoline tank 21, a gasoline pump 22, A gasoline supply line GS for supplying the gasoline fuel pumped from the gasoline supply line GS to the high pressure pump 11 and a first valve 23 for opening and closing the gasoline fuel supply line .

In addition, the gasoline supply unit 20 may further include a gasoline pump controller 24 for controlling the operation of the gasoline pump 22 so as to maintain a constant pressure difference between the first pressure and the third pressure.

The gasoline pump controller 24 controls the gasoline pump 22 to maintain the pressure difference between the first pressure and the third pressure sensed by the first and third sensing sensors of the sensing unit 40, .

For example, the reference pressure difference may be set to about? 5 bar.

Here, the gasoline pump controller 24 can control the number of revolutions of the gasoline pump 22 by varying the difference between the detected pressure difference of the first pressure and the third pressure and the reference pressure difference.

Of course, the gasoline pump controller 24 may control driving of the gasoline pump 22 in accordance with a control signal of an ECU (not shown) provided in the vehicle.

The first valve 23 is provided as a cutoff solenoid valve and is connected to a gasoline supply line (not shown) for supplying gasoline fuel in accordance with a control signal of an ECU (not shown) provided in the vehicle in a gasoline mode, GS).

On the other hand, the first valve 23 closes the gasoline supply line GS so as to block the supply of gasoline fuel in the LP mode in which the engine is supplied with the LP fuel.

The slurry supply unit 30 includes a bomb 31 for storing the slurry fuel, an LPF 32 for pumping the LPF 32, an LPF 32, A regulator unit 33 for delivering fuel pumped from the high-pressure pump 11 to the high-pressure pump 11 and maintaining the pressure of the fuel recovered in the high-pressure pump 11 at a predetermined pressure, And a second valve (34) selectively blocking the second valve (34).

Between the LP pump 32 and the high-pressure pump 11 is connected an LP feed line LS for feeding the LP feed to the engine by the pumping operation of the LP pump 32 in the cylinder 31, 33 may be installed on the supply line LS.

The bomb 31 is provided as a pressure-resistant high-pressure gas container for storing the LPG fuel in a liquid state, and can be formed into a substantially cylindrical shape.

A charging pipe 35 is connected to one side of the cylinder 31 and a charging filter 36 for removing impurities or impurities contained in the fuel charged in the cylinder 31 may be provided on the charging pipe 35.

The other end of the cylinder 31 may be provided with a multi-valve 37 for selectively delivering the LPG pumped by the LPG 32.

A fuel filter 38 for removing impurities or impurities contained in the fuel supplied to the regulator unit 33 between the regulator unit 33 and the multi valve 37 may be provided in the LP feed line LS.

The high-pressure pump 11 pressurizes the gasoline fuel or the LPG fuel supplied through the gasoline feed line GS and the LP feed line LS to a predetermined high pressure and supplies the pressurized fuel to the high-pressure fuel rail 12.

For example, the high-pressure pump 11 may pressurize some of the supplied gasoline fuel and some of the LPG fuel to a high pressure, for example, about 40 to 150 bar, and supply the pressurized fuel to the high-pressure fuel rail 12.

The high-pressure pump 11 can be supplied to the high-pressure fuel rail 12 and recovered to the cylinder 31 via the LPR line LR at a low pressure before the surplus LPR fuel is pressurized to the high-pressure state.

The regulator unit 33 includes a cutoff solenoid valve (not shown) that is opened and closed to supply or block the supplied LPF pumped by the LPF 32 to the high pressure pump 11 side, (Not shown) for detecting the temperature of the LPF, a pressure sensor (not shown) for detecting the pressure of the LPF recovered in the high-pressure pump 11, and a pressure sensor And a regulator (not shown) for keeping the pressure constant at a predetermined set pressure.

The regulator may maintain the pressure of the LPG fuel recovered in the cylinder 31 at a predetermined set pressure, e.g., the cylinder pressure + DELTA 5bar.

The set pressure is a preset pressure to prevent vaporization by pressurizing the fuel recovered to the cylinder 31 through the recycle line LR to achieve thermal equilibrium within the cylinder 31. [

Accordingly, the inside of the cylinder 31 is subjected to thermal equilibrium by the LPF delivered by the LPP 32 and the LPF recovered from the high-pressure pump 11.

The sensing unit 40 includes a first pressure sensor 41 installed in the gasoline tank 21 and sensing a first pressure of the gasoline fuel stored in the gasoline tank 21, A second pressure sensor 42 installed at the outlet of the regulator unit 33 for sensing the second pressure of the fuel filled in the cylinder 31 and a second pressure sensor 42 installed at the outlet of the regulator unit 33 or at the connection part of the slip supply line S, And a third pressure sensor 43 for sensing a third pressure of the fuel supplied from the first pressure pump 33 to the high pressure pump 11.

The mounting positions of the first to third pressure sensors 41 to 43 are not limited to the above-described positions, and various changes may be made to detect the first to third pressures.

The control unit 50 can control the driving of the LPG 22 based on the pressure difference between the second pressure and the third pressure detected by the second and third pressure sensors 42 and 43. [

For example, the control unit 50 compares the pressure difference between the second pressure and the third pressure with a predetermined reference pressure difference, for example, about 5 bar, and controls the motor (not shown) provided in the LPM 32, The rotation speed of the flap 32 can be controlled variably.

In this embodiment, the controller 50 can control the rotational speed of the motor in a plurality of preset stages, for example, five stages, according to an experimental result using an actual product.

Table 1 is a table showing the rotation speed of the number of stages of motors provided in the LPM.

division Rotation speed 1st stage 500 2nd stage 1000 3rd stage 1500 4 stage 2000 5 stage 2800

As shown in Table 1, the control unit 50 sets the drive of the motor at 1, 000 rpm, 1000 rpm, 1500 rpm, 2000 rpm, and 2800 rpm, respectively, based on the comparison result of the pressure difference between the second pressure and the third pressure and the reference pressure difference The speed of the motor can be controlled by dividing it into five to five stages.

Particularly, in consideration of the characteristics of the LPG fuel, the control unit 50 controls the motor at least in the case where the second and third pressure values sensed by the second and third pressure sensors 42 and 43 rise abnormally due to vaporization, It can be controlled to be driven at about 400 to 500 rpm or more, which is set in the first stage.

That is, when the second and third pressures rises while the fuel is vaporized by the heat of the engine in the state where the driving of the LPF 32 is stopped, it is a main cause of generation of the engine cooing and the starting off.

Accordingly, in the present invention, when the ignition key is turned on, the fuel pump is always driven at least in one step, that is, about 400 to 500 rpm, thereby preventing engine braking and starting off caused by vaporization of fuel by heat of the engine can do.

When the engine is started in the LP mode using the LP fuel due to a shortage of gasoline fuel or the like, the control unit 50 prompts the LP feed line LS, the high-pressure pump 11, and the high- It is possible to control the motor of the LPM 32 to be driven at an initial rotation speed, for example, about 2000 rpm corresponding to four stages, for a predetermined initial set time, so as to supply fuel.

For example, the initialization time may be set to about 3 to 7 seconds. Of course, the initial setting time can be variously changed according to the specifications of the LPG 32 or the motor, the specifications of the engine, and the like.

On the other hand, the control unit 50 may control to increase or decrease the rotation speed of the motor linearly according to the difference between the pressure difference between the second pressure and the third pressure and the reference pressure difference, according to an experiment result using an actual product .

The control unit 50 controls the motor driving unit to control the rotation speed of the motor based on a motor driving unit (not shown) for driving the motor provided in the LPM 32 and a pressure difference between the second pressure and the third pressure. And a motor controller (not shown) for generating a signal.

The control unit 50 may be integrally or separately provided to one side of the cylinder 31, for example, the multi-valve 37, so as to minimize the distance from the elastomer pump 32 and minimize the influence of electromagnetic waves generated in the vehicle.

Next, a fuel supply control method of a fuel supply control apparatus for a gasoline and an LPG modified vehicle according to a preferred embodiment of the present invention will be described in detail with reference to FIG.

FIG. 2 is a flowchart for explaining steps of a fuel supply control method of a fuel supply control apparatus for a modified gasoline and LPG vehicle according to a preferred embodiment of the present invention.

When the ignition key is turned on in step S10 of FIG. 2, the gasoline pump controller 24 and the control unit 50 provided in the gasoline supply unit 20 start to receive power from the battery.

At this time, the ECU provided in the vehicle checks whether or not the gasoline fuel stored in the gasoline tank 21 is in a deficient state (S12). If the gasoline fuel is in a deficient state, the ECU switches to the LP mode.

In accordance with the control signal from the ECU, the first valve 23 is operated to shut off the supply of gasoline fuel, and the second valve 34 is operated to return some of the LPG supplied to the high- (S14).

The control unit 50 controls the supply of the LPG fuel to the LPG 32 during the initial set time so as to supply the LPG to the LPG 11, ) At about 2000 rpm, that is, in four stages (S16).

Accordingly, in the present invention, when the ignition key is turned on, the fuel pump is always driven at a minimum of about 400 to 500 rpm or more to prevent the occurrence of engine stall and start-up caused by fuel vaporization due to heat of the engine .

When the initial set time has elapsed, the controller 50 controls the motor of the LPM 32 to move to the next step S24 in order to drive the motor at the minimum rotation speed of the first stage.

When the gasoline fuel is in the normal state as a result of the inspection in step S12, the first valve 23 is turned on to supply gasoline fuel to the engine, and the second valve 34 is turned on when the gasoline fuel supplied to the high- 31) (S18).

The gasoline pump controller 24 is configured to supply the gasoline fuel to the gasoline supply line GS, the high-pressure pump 11 and the high-pressure fuel rail 12 at an early stage of engine startup, (Step S20) so as to drive the motor of the motor 22 at the maximum rotational speed.

When the initial set time has elapsed, the ECU switches to the LP mode.

Then, the first valve 23 is turned off to shut off the supply of gasoline fuel, and the second valve 34 is turned on so that a part of the LPG supplied to the high-pressure pump 11 can be recovered at a low pressure (S22).

Through this process, when the engine startup is completed and the initial set time has elapsed, the controller 50 controls the motor of the LPM 32 to drive at the minimum rotation speed of the first stage.

The first to third pressure sensors 41 to 43 provided on the gasoline tank and the cylinder 11 and the fuel supply line S respectively control the pressures of the respective fuel packed in the gasoline tank 21 and the cylinder 31 I.e., the first pressure and the second pressure, and the pressure of the fuel supplied to the high-pressure pump 11, i.e., the third pressure (S26).

In step S28, the gasoline pump controller 24 checks whether the gasoline mode changeover switch (not shown) is operated to switch to the gasoline mode.

When the gasoline pump mode is switched to the gasoline mode as a result of the inspection in step S28, the gasoline pump controller 24 controls the rotational speed of the motor provided in the gasoline pump 22 to be controlled to be driven in accordance with the pressure difference between the first pressure and the third pressure (S30 ).

Subsequently, the gasoline pump controller 24 controls to proceed to the following step S36.

If it is determined in step S28 that the LP mode is maintained, the control unit 50 compares the pressure difference between the first pressure and the second pressure detected by the second and third pressure sensors 42 and 43 with the predetermined reference pressure difference (S32).

If the sensed pressure difference is greater than the reference pressure difference as a result of the comparison in step S32, the controller 50 controls the rotation speed of the motor provided in the LP pump 32 to be controlled so as to be driven (S34).

For example, the controller 50 controls the motor 50 to rotate at a rotational speed set to any one of a plurality of stages, that is, a control stage divided into a first stage to a fifth stage, according to the difference between the sensed pressure difference and the reference pressure difference. Driving can be controlled.

In step S36, the control unit 50 checks whether the ignition key is turned off to stop the engine starting and cut off the power supply.

If it is determined in step S36 that the ignition key remains on continuously, the control unit 50 controls the control unit 50 to repeat steps S26 through S36.

On the other hand, if it is determined in step S36 that the ignition key is turned off, the control unit 50 or the gasoline pump controller 24 stops driving the currently driven fuel pump and terminates.

The control unit 50 and the gasoline pump controller 24 repeat the steps S10 to S38 at the time of restarting the engine. In particular, during the initial setting period of the restart, the gasoline pump 22 is driven to the maximum, ) Are driven in four stages.

According to the above-described process, the present invention provides a control unit for controlling driving of an LPG fuel pump in a vehicle modified to use gasoline and LPG in a gasoline direct injection system, and controls the driving of the LPG fuel pump Can be controlled.

Although the invention made by the present inventors has been described concretely with the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

The present invention is applied to a technique of controlling driving of an LPF according to the running state of a vehicle by providing a control unit for controlling the driving of the LPF on a vehicle modified to use gasoline and LPF in a gasoline direct injection system.

10: Fuel supply control device of modified gasoline and LPG
11: High pressure pump 12: High pressure fuel rail
20: gasoline supply unit 21: gasoline tank
22: gasoline fuel pump 23: first valve
24: Gasoline pump controller 30:
31: Bombbeck 32: Elpie Fuel Pump
33: regulator unit 34: second valve
35: Charging pipe 36: Charging filter
37: multi-valve 38: fuel filter
40: Sensing parts 41 to 43: First to third pressure sensors
50: Control unit GS: Gasoline supply line
LS: Elpida supply line LR: Elpida recovery line

Claims (9)

1. A fuel supply control device for a vehicle adapted to use gasoline and LPG in a gasoline direct injection system,
A gasoline supply unit for supplying gasoline fuel to the engine,
An < RTI ID = 0.0 > elastomeric < / RTI &
A high-pressure pump for pressurizing the gasoline fuel or the LPG fuel supplied from the gasoline supply unit or the LPG supply unit to a predetermined high pressure,
A sensing unit for sensing a first pressure and a second pressure of each fuel stored in the gasoline tank and the cylinder, and a third pressure of the fuel supplied to the high-pressure pump,
And a control unit for controlling the driving of the LPF provided in the cylinder on the basis of the pressure of the fuel supplied to the high-pressure pump and the pressure of the LPF filled in the cylinder,
The sensing unit may include a first pressure sensor installed in the gasoline tank and sensing the first pressure,
A second pressure sensor installed in the bomb or in the multi-valve and sensing the second pressure,
And a third pressure sensor installed in an LP feed line connected between the bomb and the high pressure pump and sensing the third pressure,
Wherein the control unit controls the driving of the LPF based on a pressure difference between the second pressure and the third pressure detected by the second and third pressure sensors. Device. delete The method according to claim 1,
The gasoline supply unit includes a gasoline tank in which gasoline fuel is stored,
A gasoline fuel pump for pumping the gasoline fuel stored in the gasoline tank,
A gasoline supply line for supplying gasoline fuel pumped from the gasoline fuel pump to the high-pressure pump,
A first valve installed on the gasoline supply line and operated to open or close to supply or block gasoline fuel,
And a gasoline pump controller for controlling driving of the gasoline fuel pump so as to maintain a constant pressure difference between the first pressure and the third pressure,
Wherein the gasoline pump controller controls the rotational speed of the motor provided in the gasoline fuel pump so as to maintain the pressure difference between the first pressure and the third pressure detected by the first and third pressure sensors at a preset reference pressure difference And the fuel supply control device of the modified version of the gasoline-and-elasto-modified vehicle. 2. The apparatus of claim 1,
The bomb, which stores the LPG fuel,
An elastomer fuel pump installed in the cylinder and pumping the LP fuel,
A regulator unit which transfers the fuel pumped from the LPF to the high-pressure pump and maintains the pressure of the fuel recovered in the high-pressure pump at a predetermined pressure;
And a second valve for selectively blocking the LPG recovered from the high-pressure pump,
The control unit compares the pressure difference of the second and third pressures with a preset reference pressure difference and controls the reference pressure difference to be maintained by increasing or decreasing the rotational speed of the motor provided in the LPF based on the result of the comparison And the fuel supply control device for a gasoline and LPG modified vehicle. The method according to any one of claims 1, 3, and 4,
Wherein the control unit drives the LPF at a predetermined initial rotation speed for a preset initial time when starting the engine in the LPF mode,
And controls the drive of the LPF to a predetermined minimum rotation speed while the ignition key is in an on-state. A fuel supply control method of a vehicle adapted to use gasoline and LPG in a gasoline direct injection system,
(a) supplying power to the high-pressure pump and the high-pressure fuel rail by driving the gasoline fuel pump at a maximum rotational speed for a predetermined initial set time in the gasoline pump controller when the ignition key is powered on,
(b) when the initial set time has elapsed, driving the control unit to drive the LPF at a predetermined minimum rotational speed,
(c) sensing a first pressure of the fuel filled in the bomb at the sensing part and a second pressure of the fuel supplied to the high pressure pump by the pumping action of the LPF, and
(d) controlling the rotation speed of the LPF so that the pressure difference between the first and second pressures sensed by the controller maintains a predetermined reference pressure difference. Fuel supply control method. 7. The method of claim 6, wherein step (a)
(a1) checking the lack of gasoline fuel stored in the gasoline tank at the ECU of the vehicle,
(a2) driving the LPM at a predetermined initial rotational speed for the initial set time in the controller if the gasoline fuel is low as a result of the inspection in the step (a1); and
(a3) driving the gasoline fuel pump at the maximum rotation speed for the initial set time in the gasoline pump controller if the gasoline is in the normal state as a result of the inspection in the step (a1) Fuel supply control method. 7. The method of claim 6, wherein step (d)
(d1) comparing the pressure difference of the first and second pressures with the reference pressure difference, and
(d2) if the pressure difference between the first and second pressures is greater than the reference pressure difference as a result of the inspection in the step (d1), the rotation speed of the fuel pump is raised to a rotation speed corresponding to any one of a plurality of preset stages And controlling the fuel supply amount of the gasoline-and-elastomeric modified vehicle. 9. The method according to any one of claims 6 to 8,
(e) when the gasoline pump mode is switched to the gasoline mode, to maintain the pressure difference between the third pressure of the gasoline fuel stored in the gasoline tank and the second pressure of the gasoline fuel supplied to the high- Further comprising the step of controlling the driving of the gasoline fuel pump.

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