KR20140044655A - Fuel supply apparatus for vehicle - Google Patents

Abstract

The present invention relates to a vehicular fuel supply apparatus. The main purpose of the present invention is to provide a vehicular fuel supply apparatus capable of preventing the unnecessary consumption of a flow rate and energy in a fuel pump; capable of solving the efficiency deterioration problem, the NVH problem, and the durability problem of the fuel pump; and capable of minimizing a noise generation problem in a jet pump, wherein the efficiency deterioration problem, the NVH problem, and the durability problem are due to the constant driving of the jet pump. The vehicular fuel supply apparatus according to the present invention is provided to accomplish the purpose, comprises: a fuel tank; the fuel pump supplying fuel from the fuel tank to an engine by pumping the fuel; and the jet pump moving the fuel after sucking the fuel from the inside of the fuel tank by a negative pressure formed by jetting the fuel, which is supplied from the fuel pump, through a jet nozzle, and further includes a shut-off unit selectively shutting off fuel supply from the fuel pump to the jet pump depending on the amount of the fuel inside the fuel tank. [Reference numerals] (AA) Supply fuel to an engine

Description

Fuel supply apparatus for vehicle

The present invention relates to a fuel supply apparatus for a vehicle, and more particularly, to prevent unnecessary driving of a jet pump, unnecessary pumping flow rate consumption and energy consumption in a configuration employing a saddle type fuel tank and a jet pump. It relates to a fuel supply device for a vehicle.

The fuel tank is for storing fuel required for driving a vehicle, and has a cylindrical shape having a predetermined storage volume and is mounted on the lower portion or one side of the vehicle body.

1 is a schematic view showing a conventional saddle-type fuel tank, the lower plate of the fuel tank 10 is formed in the middle concave shape so that the exhaust pipe or the like can be positioned across the vehicle layout.

In this case, the fuel tank 10 is divided into a main tank 11 in which the fuel pump 20 is installed based on the concave portion of the lower plate, and a sub tank 12 for sending fuel to the main tank 11 side.

The main tank 11 is equipped with a fuel pump 20 for pumping fuel and supplying it to the engine side through the main supply line 21, and a sub tank 12 between the main tank 11 and the sub tank 12. A suction line 13 is connected to suck the fuel on the side and move the fuel to the main tank 11 side.

The main tank 11 is provided with a reservoir cup 14 for allowing fuel to be moved from the sub tank 12 side to the main tank side to be concentrated around the fuel pump 20 so that the pumping in the fuel pump can be performed smoothly.

The reservoir cup 14 is provided in a predetermined volume to surround the fuel pump 20, and is provided to allow the fuel sucked in from the sub tank 12 through the suction line 13 to flow therein.

Above the reservoir cup 14, a suction pump 13 and a jet pump 30 to which a fuel supply line 22 connected from the fuel pump 20 is connected is installed.

The jet pump 30 ejects fuel supplied from the fuel pump 20 through the fuel supply line 22 through a jet nozzle to form a negative pressure, and transmits the negative pressure to the suction line 13 through a suction line. The fuel on the sub tank 12 side can be sucked in.

The fuel sucked through the suction line 13 from the sub tank 12 by the jet pump 30 is first stored in the reservoir cup 14 around the fuel pump 20 in the main tank 11.

Of course, since there is a specification without the reservoir cup 14 in the fuel tank 10, in the case of the specification without the reservoir cup, the fuel sucked by the jet pump 30 is moved around the fuel pump 20 in the main tank 11. It is to be discharged.

The jet pump 30 is to secure fuel supply safety of the fuel pump 20, and serves to draw the fuel in the fuel tank 10 to the fuel pump 20, and the fuel in the fuel tank 10 In a shortage state, the fuel pump 20 allows the engine to stably supply fuel.

As shown in FIG. 2, the jet pump 30 is connected to a fuel supply line (22 in FIG. 1) so that the fuel supplied to the inlet part 31 and the inlet part 31 are ejected. The jet nozzle 32 and the suction line 13 are connected to the suction part 33 through which the fuel is sucked, the mixing part 34 into which the feed fuel and the intake fuel are mixed, and the fuel passing through the mixing part 34 is diffused to form a final part. It is comprised including the diffusion part 35 discharged.

In this configuration, the fuel supplied to the inlet portion 31 through the fuel supply line 22 moves at high speed while being ejected through the jet nozzle 32, and the fuel of the sub tank 12 is formed by the negative pressure formed around the fuel nozzle. The suction line 13 is sucked into the suction part 33 of the jet pump 30.

In addition, the fuel sucked into the suction part 33 of the jet pump 30 is moved to the mixing part 34, passes through the diffusion part 35, and is discharged to be finally moved to the reservoir cup 14.

On the other hand, in the fuel supply device as described above, when the jet pump 30 operates, the fuel is sucked into the sub tank 12 and drawn into the main tank 11 or the reverser cup 14.

In addition, in order to allow the fuel in the sub tank 12 to be sucked into the main tank 11 or the reservoir cup 14, fuel must be supplied to the jet pump 30, and for this purpose, the fuel pump 20 must be driven.

However, since the fuel is always supplied from the fuel pump 20 to the jet pump 30 when the fuel is supplied to the engine, the fuel pump 20 must be additionally driven by the amount of fuel supplied to the jet pump 30 and consumed. do.

As a result, the fuel pump 20 always supplies fuel to the jet pump 30 even when the main tank 11 or the reservoir cup 14 is sufficiently full of fuel, and the reservoir cup 14 overflows with fuel. It comes out and wastes unnecessary energy.

For example, in the conventional fuel supply apparatus using the jet pump 30, in the case of the high load region, the intake fuel is filled in the reservoir cup 14, thereby ensuring the fuel supply stability to the engine, but the low load region (children (Area), unnecessary pump flow rate is wasted, and the driving efficiency and NVH performance of the pump 20 are deteriorated.

In addition, the durability of the pump 20 occurs, noise is generated due to the fluid sound inside the jet pump 30 that is always driven, the noise of the jet pump 30 is more severe in the idle state relatively small vehicle noise appear.

Therefore, the present invention was created to solve the above problems, to prevent unnecessary flow consumption and energy consumption in the fuel pump, the problem of efficiency reduction of the fuel pump due to the constant driving of the jet pump, NVH problem, durability problems The purpose of the present invention is to provide a fuel supply device for a vehicle capable of improving noise and minimizing a noise generation problem in a jet pump.

In order to achieve the above object, the present invention, by the fuel tank, a fuel pump for pumping the fuel of the fuel tank to supply to the engine, and by the negative pressure that the fuel supplied from the fuel pump is ejected through the jet nozzle is formed A vehicle fuel supply apparatus including a jet pump for sucking and moving fuel in a fuel tank, the vehicle fuel supply apparatus comprising: an intermittent means for selectively controlling fuel supply from the fuel pump to the jet pump according to the amount of fuel in the fuel tank; Provided is a vehicle fuel supply apparatus.

Here, the control means is characterized in that the shut-off valve is installed in the fuel supply line for supplying fuel from the fuel pump to the jet pump to selectively open and close the fuel supply line.

In addition, the control means cuts off the fuel supply to the jet pump through the fuel supply line when the amount of fuel in the fuel tank is higher than the set amount, and opens the fuel supply line so that the fuel can be supplied when the amount of fuel in the fuel tank is lower than the set amount. It is characterized in that it is provided to.

In addition, the control means is characterized in that the float valve for opening and closing the flow path of the fuel supply line in conjunction with the vertical position of the float according to the fuel level in the fuel tank.

The float valve may also include a valve housing installed on a fuel supply line; A valve body installed to be elastically supported by a return spring in the valve housing and operable to open and close a flow path in the valve housing by movement of a valve shaft; A valve shaft connected to the valve body; A rotation arm connected to the valve shaft to move the valve shaft by pivoting in conjunction with vertical movement of the following float; And a float installed on the pivot arm and moved up and down according to the fuel level in the fuel tank.

In addition, the fuel level in the fuel tank is the fuel level in the main tank in which the fuel pump is installed, the float is characterized in that installed in the main tank.

In addition, the fuel level in the fuel tank is the fuel level in the reservoir cup installed to surround the fuel pump, characterized in that the float is installed in the reservoir cup.

In addition, the fuel amount measuring means for measuring the amount of fuel in the fuel tank and outputs an electrical signal accordingly; And a control unit for outputting a control signal according to the amount of fuel in the fuel tank detected by the fuel amount measuring means, wherein the control unit is an electronic valve in which opening and closing operation is controlled according to a control signal output from the control unit. .

Accordingly, the vehicle fuel supply apparatus according to the present invention is configured to automatically shut off the fuel supplied from the fuel pump to the jet pump through the valve when the amount of fuel in the fuel tank or reservoir cup is above a certain level, thereby unnecessary flow rate in the fuel pump. Consumption and energy consumption can be prevented, and the problem of deterioration of the fuel pump efficiency, NVH problem, and durability problems due to the constant driving of the jet pump can be improved.

In addition, it is possible to improve the noise generation problem in the jet pump, and in particular, since the operation of the jet pump can be stopped while the fuel consumption is low and the liquid level of the fuel in the tank is stable, the effect of the noise improvement becomes greater.

1 is a schematic view showing a conventional saddle-type fuel tank.
2 is a cross-sectional view showing a conventional jet pump.
3 is a block diagram showing a fuel supply device according to the present invention.
Figure 4 is an operating state diagram showing the operating state of the mechanical valve in the fuel supply device according to the present invention.
5 is a cross-sectional view showing an electronic valve in the fuel supply device according to the present invention.
6 is a flowchart illustrating a control method of an electronic valve in a fuel supply device according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be easily understood by those skilled in the art.

The present invention relates to a vehicle fuel supply apparatus capable of controlling the operation of a jet pump in conjunction with the fuel amount of a fuel tank or reservoir cup.

In more detail, the fuel supply device of the present invention sucks the fuel in the subtank when the amount of fuel in the fuel tank (main tank) or reservoir cup is lower than a certain level (when the fuel level is lower than the set value). It is configured to operate a jet pump (fueled from the fuel pump to the jet pump) for moving to the cup, and to ensure the safety of fuel supply to the engine in the high load region.

On the other hand, if the fuel level of the fuel tank or reservoir cup is higher than a certain level (when the fuel level is higher than the set value), the fuel is filled around the fuel pump, so that the fuel supplied from the fuel pump to the jet pump is blocked It is configured to stop the pump operation, thereby preventing unnecessary pumping flow rate and energy consumption of the fuel pump in the low load region.

Therefore, in the present invention, when the jet pump is always driven (in the past, the jet pump is always driven when the fuel pump is driven to supply fuel to the engine). In particular, since unnecessary driving of the jet pump is prevented, noise problems due to internal fluid sounds can be minimized.

Hereinafter, the configuration of the present invention will be described in detail with reference to the drawings.

Figure 3 is a block diagram showing a fuel supply device of the present invention, Figure 4 is an operating state diagram showing the operating state of the mechanical valve in the fuel supply device according to the invention.

If necessary, the configuration is shown to stop the operation of the jet pump 30 irrespective of the fuel supply to the engine and the driving of the fuel pump 20, and selectively stops the operation of the jet pump 30 according to the amount of fuel In order to control the fuel supply line 22 to the fuel supply line 22 is connected to the jet pump 30 to install the intermittent means 40 to selectively regulate the fuel supply.

Here, the control means 40 may be installed in the fuel supply line 22 for supplying fuel from the fuel pump 20 to the jet pump 30 may be a shutoff valve for selectively opening and closing the flow path of the fuel supply line. .

In addition, the control means 40 cuts off the fuel supply to the jet pump 30 through the fuel supply line 22 when the amount of fuel in the fuel tank 10 is greater than or equal to the set amount, and sets the amount of fuel in the fuel tank 10. If less than the amount is provided to open the flow path of the fuel supply line 22 so that fuel can be supplied.

In one embodiment of the present invention, the intermittent means 40 selectively selects a flow path of the fuel supply line 22 by interlocking with a position of the float 46 that moves up and down according to the fuel level in the fuel tank 10. It can be a mechanical valve opening and closing with.

The float 46 may be installed in the main tank 11 when the reservoir cup 14 is not installed, or in the reservoir cup 14 when the reservoir cup 14 is installed.

Of course, even when the reservoir cup 14 is installed, the float 46 may be installed at a position outside the reservoir cup 14 in the main tank 11.

Looking at the configuration of the mechanical valve, as shown in Figure 4, the valve housing 41 is installed on the fuel supply line 22, the valve body elastically supported by the return spring 42 in the valve housing 41 ( 43), the valve shaft 44 connected to the valve body 43, the rotating arm 45 connected to the valve shaft 44, the rotating arm 45, so as to float on the liquid level of the fuel in the fuel tank 10 It may be a configuration including the float 46.

Here, the valve housing 41 is installed on the fuel supply line 22, and is provided to allow the fuel supplied by the fuel pump 20 to the jet pump 30 to pass therethrough.

In addition, the valve body 43 is installed to open and close the flow path in the valve housing 41 according to the up and down position, and in particular, the elastic opening and closing operation is performed by the return spring 42, which acts on the valve body 43. The elastic restoring force of the return spring 42 acts to close the flow path in the valve housing 41.

In addition, in a preferred embodiment, the valve body 43 may be configured to be installed in the diaphragm 47 installed inside the valve housing 41, whereby the mechanical shut-off valve (interruption means) 40 is in the form of a diaphragm valve Can be

The lower end of the valve shaft 44 which extends outside the valve housing 41 is connected to the valve body 43, and the upper end of the valve shaft 44 is hinged to the rotation arm 45 so that the upper and lower sides of the rotation arm 45 are closed. The valve shaft 44 moves linearly up and down at the time of rotation.

Rotating arm 45 is hinged to the rotating shaft 48 provided on the inner surface of the main tank 11 or the reservoir cup 14 to rotate about the rotating shaft 48 when the float 46 moves up and down.

In addition, the float 46 provided on the pivoting arm 45 is provided to move up and down according to the height (fuel level) of the fuel liquid level, that is, the fuel amount, while floating on the fuel liquid level in the fuel tank 10. 46 moves up and down to rotate the rotation arm 45.

When the amount of fuel in the fuel tank 10 falls below the set amount in the shutoff valve (isolation means) 40 having such a configuration, the rotation arm 45 rotates clockwise in the drawing of FIG. 4 while the float 46 descends. Then, the valve shaft 44 and the valve body 43 are raised (at this time, the return spring 42 is compressed) to open the flow path (flow path of the fuel supply line) in the valve housing 41.

In this case, the fuel supplied from the fuel pump 20 is supplied to the jet pump 30 through the fuel supply line 22 and the shutoff valve 40, and the sub tank (by the negative pressure generated in the jet pump 30) The fuel of 12 is sucked through the suction line 13 and moved into the main tank 11 or the reservoir cup 14.

As a result, sufficient fuel may be secured around the fuel pump 20, thereby securing fuel supply stability to the engine.

On the other hand, in the state where the fuel of the main tank 11 or the reservoir cup 14 is filled with a predetermined amount or more, the float 46 remains in a raised state, and the rotating arm 45 pushes the valve shaft 44 downward. In addition, the valve body 43 is lowered by the elastic restoring force of the return spring 42, and at this time, the flow path in the valve housing 41 is closed by the valve body 43 (the valve is blocked due to the float rising when the fuel liquid level rises). ).

The fuel supply from the fuel pump 20 to the jet pump 30 is cut off, the operation of the jet pump 30 is stopped.

On the other hand, as an intermittent means installed in the fuel supply line 22, that is, the shut-off valve 40, the mechanical valve as described above may be replaced by an electronic valve that is opened and closed according to the control signal of the control unit 2, the electronic valve Referring to the embodiment employing the following.

5 is a cross-sectional view showing an electronic valve that can be used in the fuel supply device according to the present invention, Figure 6 is a flow chart for explaining a control method of the electronic valve.

The fuel supply device employing the electronic valve further includes a fuel amount measuring means 1 for measuring the amount of fuel in the fuel tank 10, which may be a fuel gauge pre-installed to measure the amount of fuel in the fuel tank 10.

In a typical vehicle, the fuel tank 10 is provided with a fuel gauge so as to measure the amount of fuel in the fuel tank 10 to display the amount of fuel in a cluster of the driver's seat.

As an example of the fuel gauge, a float type that outputs an electrical signal corresponding to the fuel level through a variable resistor according to the up and down positions of the float in the fuel tank is used, and in the present invention, such a float type fuel gauge is used as the fuel amount measuring means. Can be.

In addition to the float type, a conventional fuel gauge provided in the vehicle may be used to output an electrical signal according to the amount of fuel in the fuel tank. The configuration of such a fuel gauge will be omitted since it is a known technique.

The fuel amount measuring means 1 measures the fuel amount and outputs the fuel amount signal, that is, the fuel amount signal is input to the control unit 2, and the control unit 2 supplies a fuel supply line when the measured fuel amount in the fuel tank 10 is less than the set amount. A control signal for opening the flow path of 22 is output. On the other hand, if the fuel amount in the fuel tank 10 is greater than or equal to the set amount, a control signal for blocking the flow path of the fuel supply line 22 is output.

Thus, as in the application of the mechanical valve described above, it is possible to selectively block the fuel supply supplied from the fuel pump 20 to the jet pump 30 according to the amount of fuel in the fuel tank 10.

The electronic shut-off valve (interruption means) 40 is installed on the fuel supply line 22 between the fuel pump 20 and the jet pump 30 like the mechanical shut-off valve and supplies fuel according to the control signal of the controller 2. The flow path on the line 22 is selectively opened and closed, and an example of the electromagnetic valve may be the solenoid valve shown in FIG.

In addition, the electronic valve in the present invention may be adopted without particular limitation as long as it can be controlled to open and close the flow path by an external electrical signal.

5 is a view showing an example of an electronic valve usable in the present invention, which shows a solenoid valve whose opening and closing operation is controlled according to a control signal output from the control unit 2.

Referring to FIG. 5, when the built-in solenoid is driven by a control signal of the controller 2 (current is applied to the solenoid) to lower the plunger 52, the valve element 53 at the bottom of the plunger shuts off the flow path. Is shown.

6 shows a control process of the electronic valve when the electronic valve is used as the shutoff valve, and measures the fuel amount (fuel amount in the main tank or fuel amount in the reservoir cup) in the fuel tank 10 through the fuel amount measuring means 1. (S1), when it is determined that the measured amount of fuel in the fuel tank 10 is equal to or larger than the set amount α, the control unit 2 outputs a control signal for shutting off the fuel supply to the jet pump 30. By the control signal, the electronic valve (solenoid 51 valve) is operated to close the flow path to block the fuel supply from the fuel pump 20 to the jet pump 30 (S2, S3).

In this way, in the fuel supply apparatus of the present invention, when the amount of fuel in the fuel tank is above a certain level, the operation of the jet pump is stopped by blocking the flow path of the fuel supply line for supplying the fuel from the fuel pump to the jet pump. This prevents the pump from consuming flow.

1 fuel amount measuring means 2 control unit
10: fuel tank 11: main tank
12: sub tank 13: suction line
14: reservoir cup 20: fuel pump
21: main supply line 22: fuel supply line
30: jet pump 40: intermittent means (blocking valve)
41: valve housing 42: return spring
43: valve body 44: valve shaft
45: rotation arm 46: float
48: rotation axis 52: plunger
53: valve body

Claims (8)

A fuel tank, a fuel pump for pumping the fuel of the fuel tank to supply the engine, and a jet pump for sucking and moving the fuel in the fuel tank by the negative pressure formed by the fuel supplied from the fuel pump is ejected through the jet nozzle. In the fuel supply device for a vehicle comprising:
And a control means for selectively controlling fuel supply from the fuel pump to the jet pump according to the amount of fuel in the fuel tank.
The method according to claim 1,
The intermittent means is a vehicle fuel supply device, characterized in that the valve is installed in the fuel supply line for supplying fuel to the jet pump from the fuel pump to selectively open and close the fuel supply line.
The method according to claim 1 or 2,
The control means cuts off the fuel supply to the jet pump through the fuel supply line when the amount of fuel in the fuel tank is equal to or greater than the set amount, and opens the fuel supply line so that fuel can be supplied when the amount of fuel in the fuel tank is less than the set amount. Vehicle fuel supply apparatus characterized in that it is provided.
The method of claim 3,
The control means is a vehicle fuel supply device, characterized in that the float valve for opening and closing the flow path of the fuel supply line in conjunction with the up and down position of the float according to the fuel level in the fuel tank.
The method of claim 4,
The float valve
A valve housing installed on the fuel supply line;
A valve body installed to be elastically supported by a return spring in the valve housing and operable to open and close a flow path in the valve housing by movement of a valve shaft;
A valve shaft connected to the valve body;
A rotation arm connected to the valve shaft to move the valve shaft by pivoting in conjunction with vertical movement of the following float; And
A float installed on the pivot arm and moved up and down according to the fuel level in the fuel tank;
Vehicle fuel supply apparatus comprising a.
The method of claim 5,
And a fuel level in the fuel tank is a fuel level in a main tank in which a fuel pump is installed, and the float is installed in the main tank.
The method of claim 5,
And a fuel level in the reservoir cup installed to surround the fuel pump, wherein the float is installed in the reservoir cup.
The method of claim 3,
Fuel amount measuring means for measuring the amount of fuel in the fuel tank and outputting an electrical signal according thereto; And a control unit for outputting a control signal according to the amount of fuel in the fuel tank detected by the fuel amount measuring means.
The control means is a vehicle fuel supply device, characterized in that the electronic valve which is controlled to open and close operation in accordance with the control signal output from the control unit.

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