KR100982115B1 - Two way fuel pump apparatus for lpi vehicle - Google Patents

Abstract

Disclosed is a bi-directional fuel pump device for an Elpia vehicle that allows an engine stop request to remove residual gaseous fuel remaining in the fuel line during a power latch after an engine stop. The present invention provides a fuel pump having a plurality of forward discharge ports and a reverse recovery port connected to a hose of a fuel line at an upper and a lower end, and a forward fuel path and a reverse fuel communicating with a forward discharge port and a reverse recovery port on both sides of the fuel pump. Fuel pump members for pumping fuel and a forward rotor and a reverse rotor for selectively pressurizing the fuel pump members so that forward and reverse flows of the fuel are generated by the fuel pump members. And a direction selection gear unit for selectively driving the forward rotor and the reverse rotor.

Elpia vehicle, fuel pump, fuel pump member, forward, reverse, direction select gear

Description

TWO WAY FUEL PUMP APPARATUS FOR LPI VEHICLE}

The present invention relates to an Elpia two-way fuel pump device for a vehicle, and more particularly to an Elpia two-way fuel pump device for controlling the fuel pressure of the fuel line by removing the fuel remaining in the fuel line after the engine stops. will be.

As is well known, an internal combustion engine is a device that generates power by burning fuel and air in an engine, and an automobile using the power of such an internal combustion engine has a fuel tank for storing fuel for supplying the engine.

Liquefied Petroleum Gas (Liquefied Petroleum Gas) fuel is used in some passenger cars and vans due to its high octane value, excellent heat resistance, and low fuel cost.

The LPG fuel supplied to the engine of the vehicle is a liquid phase, and when it is vaporized, it has a good mixing property with air and thus flammability, so knocking is less likely to occur than gasoline and diesel, and it is vapor-locked or percolated. As it is possible to prevent the occurrence of such a phenomenon, the application range is gradually increasing as an alternative fuel of gasoline or diesel fuel.

The LPG Injection (LPI) vehicle or system adopted in the method of directly injecting the LPI fuel into the liquid injector maintains the liquid state by pressurizing the LPG using the fuel pump (+5 bar relative to the fuel tank pressure). It consists of a structure that injects through the injector.

When the engine is turned off, the fuel supply through the fuel tank is stopped and the shut-off valve is closed, leaving the fuel line with only the remaining LPG's evaporative gas pressure (approximately 2-3 bar).

At this time, the boil-off gas pressure of the fuel line remains in the fuel line and is pressurized to the injector due to the pressure difference from the injector ejection outlet to generate fuel leakage. Since the leaked fuel is deposited at the injector outlet and causes the injector to become clogged, it is a fundamental cause of misfire and engine damage at the start.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems as described above, and after the engine is stopped, driving the fuel pump during the power latch to return the remaining fuel of the fuel line to the fuel tank or the remaining of the fuel line through the diesel ring driving the engine. By burning the fuel, it is possible to prevent the excess fuel remaining in the fuel line from leaking to the injector after the engine is stopped, thereby preventing air pollution due to the excess fuel leakage, and tar accumulates at the fuel outlet of the injector. The purpose of the present invention is to provide a bidirectional fuel pump device for an vehicle that can prevent a blockage from occurring.

Technical means according to the present invention for achieving this object,

A fuel pump having a plurality of forward discharge ports and reverse recovery ports connected to the hoses of the fuel lines at upper and lower ends thereof;

A plurality of fuel pump members for pumping fuel and provided with a plurality of forward fuel paths and reverse fuel paths respectively communicating with the forward discharge port and the reverse recovery port on both sides of the fuel pump;

A forward rotor and a reverse rotor for selectively pressurizing the fuel pump member such that forward and reverse flow of fuel is generated by the fuel pump member;

And a direction selecting gear unit for selectively driving the forward rotor and the reverse rotor.

In addition, the forward discharge port and the reverse recovery port of the fuel pump is characterized in that each provided with a check valve for controlling the forward and reverse flow of the fuel.

A guide member fixedly coupled to the inside of the fuel pump;

Gear direction coupled to the guide member is moved up and down, the direction selection gear shaft is provided with an upper, lower eccentric body for selectively driving the forward and reverse rotor at the upper and lower ends, and

The drive shaft is connected to the lower end of the direction selection gear shaft via a motor shaft and configured to drive and rotate the direction selection gear shaft up and down along the guide member during forward and reverse flow of fuel.

In addition, the guide member and the direction selection gear shaft is characterized in that the gear is coupled via a helical gear.

As described above, the Elpia vehicle bi-directional fuel pump device according to the present invention, by controlling the flow of the fuel by the fuel pump in both directions to easily supply the remaining fuel in the fuel line after stopping the engine at the same time as the fuel tank to the fuel tank It can be recovered.

In addition, after the engine stops, the remaining fuel in the fuel line is recovered to the fuel tank, thereby preventing the injector leakage, impregnation of impurities, deterioration of startability, increase of exhaust gas, and reduction of fuel consumption.

Hereinafter, the most preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention in detail.

1 is a view showing the configuration of a bi-directional fuel pump device for an Elpia vehicle to which the present invention is applied, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIGS. The figure shows the operation of the fuel pump device.

As shown in FIG. 1, the Elpia vehicle bi-directional fuel pump device of the present invention includes a fuel pump 10, fuel pump members 20 and 22, a forward rotor 30 and a reverse rotor 32, and a direction. It consists of the selection gear part 40.

Upper and lower ends of the fuel pump 10 are provided with a plurality of forward discharge ports 12 and reverse recovery ports 14 connected to the hoses.

In addition, the forward discharge port 12 and the reverse recovery port 14 are provided with check valves 16 for forward and reverse flow of fuel, respectively.

That is, the check valve for the forward flow of the fuel is adopted in the forward discharge port 12, the check valve for the reverse flow of the fuel is adopted in the reverse recovery port 14, the reverse flow of the fuel is prevented. .

The fuel pumping members 20 and 22 serve to pump fuel, and forward fuel paths 21 and reverse directions communicating with the forward discharge port 12 and the reverse recovery port 14 on both sides of the fuel pump 10. The fuel paths 23 are provided to be formed respectively. These fuel pump members 20 and 22 are formed of a diaphragm.

The forward rotor 30 and the reverse rotor 32 are fuel pump members 20 which form a forward fuel path 21 and a reverse fuel path 23 of the fuel pump 10 such that fuel is pumped in the forward and reverse directions. It serves to selectively press the 22, and is provided to be rotatable about the hinge portion in the interior of the fuel pump 10 in contact with the fuel pump member (20, 22).

In this case, the forward rotor 30 and the reverse rotor 32 are provided in contact with the fuel pump members 20 and 22 to face each other with a predetermined height difference so as to be selectively driven by the direction selection gear unit 40.

That is, the forward rotor 30 is disposed on the upper side of the fuel pump 10 in contact with the fuel pump member 20 forming the forward fuel path 21, the reverse rotor 32 is the reverse fuel path 23. It is disposed in the lower side of the fuel pump 10 in contact with the fuel pump member 22 forming a).

The direction selection gear unit 40 serves to selectively drive the forward rotor 30 and the reverse rotor 32 for pressing the diaphragm 20, 22 for the forward and reverse flow of the fuel, A guide motor 42 fixedly coupled to the inside of the fuel pump 10, a direction selection gear shaft 44 geared to the guide member 42, and a drive motor for rotating the direction selection gear shaft 44 ( 46).

The guide member 42 has a tubular shape and a gear part is formed at an inner circumference thereof and fixedly coupled to the inside of the fuel pump 10.

The direction selection gear shaft 44 has a shaft shape and a gear portion is formed to be geared with the guide member 42 on the outer circumference. The direction selection gear shaft 44 is geared with the guide member 42 to be guided up and down along the guide member 42 during operation of the drive motor 46.

At this time, the guide member 42 and the direction selection gear shaft 44 is geared through the helical gear to minimize the constant direction and friction loss.

Here, the gear portion for moving the direction selection gear shaft 44 up and down of the guide member 42 at the forward and reverse rotation of the drive motor 46, the inside of the guide member 42 and the direction selection gear shaft 44, It may be formed on the entire outer circumference or on a portion of the inner and outer circumferences of the guide member 42 and the direction selection gear shaft 44.

In addition, upper and lower eccentric bodies 44A and 44B, which are eccentrically opposed to each other to selectively drive the forward rotor 30 and the reverse rotor 32, respectively, on the upper and lower ends of the direction selection gear shaft 44. It is provided.

The drive motor 46 is connected to the lower end of the direction selection gear shaft 44 via a motor shaft, and the direction selection gear shaft 44 moves up and down along the guide member 42 during forward and reverse flow of fuel. The selection gear shaft 44 is rotated forward and reverse.

The direction selection gear unit 40 has a direction selection gear shaft 44 is moved up and down along the guide member 42 during forward and reverse rotation of the drive motor 46, the upper and lower eccentric body (44A, 44B) The furnace has a structure for selectively driving the forward rotor 30 and the reverse rotor 32.

Reference numeral 24 denotes a restoring spring for restoring the fuel pumping members 20 and 22.

Referring to the operation of the present invention having such a configuration as follows.

The bidirectional fuel pump device for an Elpia vehicle according to an embodiment of the present invention is initially driven in the forward direction as shown in FIG. 3 when an on signal is input to the start switch, and the fuel is discharged to the forward discharge port 12. .

That is, the direction selection gear shaft 44 constituting the direction selection gear unit 40 at the ON signal of the start switch is moved to be guided upward along the guide member 42 by the forward rotation of the drive motor 46. The upper eccentric body 44A and the forward rotor 30 are in contact with each other.

In this state, when the direction selection gear shaft 44 is rotated by the drive motor 46, the upper eccentric body 44A is eccentrically rotated to press the forward rotor 30. Then, the fuel pumping member 20 which forms the forward fuel path 21 by the pressurization of the forward rotor 30 is pumped to discharge fuel into the fuel line through the forward discharge port 12 of the fuel pump 10. Done.

On the other hand, when an off signal is input to the start switch, the driving of the fuel pump 10 which supplies the fuel in the forward direction as shown in FIG. 4 is stopped. At this time, when the fuel cutoff valve constituting the fuel system of the vehicle is shut off and the fuel rail is sealed, the fuel pump 10 is operated to generate a reverse flow, so that the fuel is recovered to the reverse recovery port 14.

That is, the direction selection gear shaft 44 constituting the direction selection gear unit 40 at the off signal of the start switch is guided downward along the guide member 42 by the reverse rotation of the drive motor 46. The lower eccentric body 44 ㅠ is in contact with the reverse rotor 32.

In this state, when the direction selection gear shaft 44 is rotated by the drive motor 46, the lower eccentric body 44B is eccentrically rotated to press the reverse rotor 32. Then, the fuel pump member 22 forming the reverse fuel path 23 by the pressurization of the reverse rotor 32 is pumped to recover the remaining fuel in the fuel line to the fuel tank through the reverse recovery port 14. do. At this time, based on the fuel pressure sensor value installed on the fuel line side, the fuel is continuously recovered until the fuel pressure reaches 1ber. When the fuel pressure is recovered, the engine control unit goes through a power latch and the power is completely turned off. Will be

As such, those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing to the technical spirit or essential features of the present invention. Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive. The scope of the invention is indicated by the following claims rather than the above description, and it should be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the invention. .

1 is a cross-sectional view showing the interior of the two-way fuel pump device for Elpia vehicle in accordance with the present invention;

2 is a cross-sectional view taken along the line A-A of FIG.

3 and 4 are cross-sectional views showing the operation of the two-way fuel pump device for Elpia vehicle in accordance with the present invention.

<Description of the symbols for the main parts of the drawings>

10: fuel pump 12: forward discharge port

14: reverse recovery port 16: check valve

20,22: fuel pump member 30: forward rotor

32: reverse rotor 40: direction selection gear

42: guide member 44: direction selection gear shaft

44A: upper eccentric body 44B: lower eccentric body

46: drive motor

Claims (4)

A fuel pump 10 having a plurality of forward discharge ports 12 and reverse recovery ports 14 connected to the hoses of the fuel lines at upper and lower ends thereof; A plurality of forward fuel paths 21 and reverse fuel paths 23 are formed on both sides of the fuel pump 10 so as to communicate with the forward discharge port 12 and the reverse recovery port 14, respectively. For fuel pumping members 20 and 22, A forward rotor 30 and a reverse rotor 32 for selectively pressurizing the fuel pump members 20 and 22 so that forward and reverse flows of fuel are generated by the fuel pumping members 20 and 22, and Elpiai vehicle two-way fuel pump device, characterized in that it comprises a direction selection gear unit 40 for selectively driving the forward rotor (30) and the reverse rotor (32). The method according to claim 1, The forward discharge port 12 and the reverse recovery port 14 of the fuel pump 10 are provided with check valves 16 for controlling the forward and reverse flow of fuel, respectively. . The method according to claim 2, The direction selection gear portion 40 is a guide member 42 fixedly coupled to the inside of the fuel pump, and The upper and lower eccentric bodies 44A and 44B which are geared to the guide member 42 to be guided up and down and move and selectively drive the forward rotor 30 and the reverse rotor 32 to the upper and lower ends. Direction selection gear shafts 44, respectively; and A driving motor connected to the lower end of the direction selection gear shaft 44 via a motor shaft and moving and rotating the direction selection gear shaft 44 up and down along the guide member 42 during forward and reverse flow of fuel ( Elpia vehicle bi-directional fuel pump device, characterized in that consisting of 46). The method according to claim 3, The guide member (42) and the direction selection gear shaft (44) is Elpiai vehicle two-way fuel pump device, characterized in that the gear is coupled via a helical gear.

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