JPH0727029A - Fuel supply device of engine - Google Patents

Abstract

PURPOSE:To try the cost down of a device by means of simplification of the device and enable a fuel temperature to be prevented from increasing by engine heat by circulating excessive fuel inside a fuel tank while a fuel pump is made in an in-tank type. CONSTITUTION:A pressure regulator 9 for making its action for blocking a fuel supply passage 3 at the time of specified pressure is arranged between a fuel pump 2 and a fuel injection valve 5, and then excessive fuel is circulated by the fuel pump 2 inside the fuel tank 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply system for supplying pressurized fuel to an engine such as an automobile.

[0002]

2. Description of the Related Art FIG. 4 is a schematic configuration diagram showing a conventional fuel supply device disclosed in, for example, Japanese Utility Model Laid-Open No. 64-13265, in which 1 is a fuel tank and 2 is a fuel tank. A fuel pump, 3 a fuel supply passage, 4 a delivery pipe, 5 a fuel injection valve attached to the delivery pipe 4, 6 a pressure regulator, 61 cooperating with a spring 62 to regulate the fuel pressure to a predetermined pressure. This is a valve portion and is composed of a rubber film 63 and a valve 64. Reference numeral 7 is a return passage for returning the excess fuel to the fuel tank 1, and 8 is fuel supplied to the fuel tank 1.

Next, the operation will be described. Fuel pump 2
Is supplied from a battery power source (not shown) or the like, the fuel 8 in the fuel tank 1 is sucked and pressurized, and the fuel supply passage 3,
Supply to the delivery pipe 4. Here, when the fuel pressure rises to a predetermined pressure set by the spring 62 in the pressure regulator 6, the valve portion 61 is pushed open and excess fuel returns to the fuel tank 1 through the return passage 7. Further, the fuel injection valve 5 is opened and closed by a signal from an engine control device (not shown) to inject the fuel 8 from the tip 51 of the fuel injection valve 5 into the intake passage and supply it to the engine as a mixture. ing.

[0004]

Since the conventional fuel supply device is constructed as described above, the fuel 8 pressurized by the fuel pump 2 returns to the fuel tank 1 via the pressure regulator 6, The pressurized fuel 8 has to pass through the vicinity of the engine which has become high temperature, and there is a problem that the temperature of the fuel 8 rises. Further, since the return passage 7 needs to be provided, the fuel supply device is complicated and the cost is increased.

The present invention has been made in order to solve the above problems. The fuel pump is an in-tank type, and the surplus fuel is circulated in the fuel tank to reduce the cost by simplifying the apparatus. An object of the present invention is to obtain an engine fuel supply device capable of preventing an increase in fuel temperature due to engine heat.

[0006]

In the fuel supply device for an engine according to the present invention, the structure of the pressure regulator is modified so that the pressure regulator arranged at the inlet of the delivery pipe reaches a predetermined fuel pressure in the delivery pipe. Then, while closing the fuel supply passage,
The pressure regulator of the fuel pump provided in the fuel tank circulates the excess fuel in the fuel tank.

[0007]

According to the present invention, when the fuel pressure reaches the predetermined pressure, the fuel supply passage is closed by the pressure regulator. Therefore, the fuel that has received heat from the engine is consumed in the engine without returning to the fuel tank, and the surplus fuel is removed. It is circulated in the fuel tank by the fuel pump.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to FIGS. 1 is a schematic configuration diagram showing the entire apparatus, FIG.
2 is a cross-sectional view showing the fuel pump of FIG. 1, and the same or corresponding parts as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, 9 is a pressure regulator arranged at the inlet of the delivery pipe 4, and 10 is a movable part which moves in response to fuel pressure, and is composed of a spring 101 and a rubber film 102. Reference numeral 11 denotes a valve portion that opens and closes the opening 12 of the fuel supply passage 3, and includes a valve spring 111, a valve 112, and a support portion 113 integrally formed with the valve 112. Figure 2
In the figure, 21 is a fuel intake port, 22 is an armature, 23 is an impeller, 24 is a discharge port, 25 is a pressure adjusting portion, 26 is a pressure adjusting spring, and 27 is a valve for opening and closing the fuel passage 28.

Next, the operation will be described. Fuel pump 2
Is pressurized by the fuel supply passage 3 and the delivery pipe 4
When the internal pressure rises to a predetermined pressure, the movable part 10 tends to be pushed up by the fuel pressure. The movable part 1
The valve 112 also tries to be pushed up by the valve spring 111 together with the support portion 113 that is in contact with 0. If the valve portion 11 is set so that the length of the support portion 113 is such that the opening 12 of the fuel supply passage 3 is closed, that is, the valve 112 abuts on the opening 12, Fuel pressure is maintained at a predetermined pressure regulated by the spring 101.

Next, when the fuel injection valve 5 is opened and closed to inject a fuel of a predetermined pressure from the tip 51 of the fuel injection valve 5 and the pressure in the delivery pipe 4 is lowered, the movable portion 10 of the pressure regulator 9 is moved by the spring 101. The valve 11 is pushed down and is supported by the support portion 113 of the valve 112.
2 is pushed down, the opening 12 of the fuel supply passage 3 is opened (state of FIG. 1), pressurized fuel is supplied to the delivery pipe 4 through the pressure regulator 9, and the fuel pressure in the delivery pipe 4 becomes a predetermined pressure. Retained. By repeating the above operation, the fuel supply pressure is adjusted to a predetermined pressure and held.

Since the fuel pressure in the fuel supply passage 3 is blocked by the valve 112 at the opening 12 of the fuel supply passage 3, it is attempted to increase the fuel pump 2 to its full capacity. Since the pressure regulating portion 25 is added, the fuel pressure is regulated to the fuel pressure set by the pressure regulating spring 26. More specifically, when power is supplied to the fuel pump 2, the armature 22 rotates and the impeller 23 engaged with the armature 22 rotates to perform a pumping action.
The fuel 8 in the fuel tank 1 is sucked and pressurized from 1 and is discharged from the discharge port 24 to the fuel supply passage 3. Here, the pressure adjusting spring 26, which is set so that the fuel pressure is slightly higher than the set pressure of the fuel supply device, is pushed up together with the valve 27 by the fuel pressure, and the fuel passage 28 of the pressure adjusting unit 25 is reached.
To open. The fuel 8 overflowing from the pressure regulator 25 is circulated into the fuel tank 1.

Example 2. In the above-described embodiment, the voltage supplied to the fuel pump 2 of the fuel supply device is controlled so that the discharge performance of the fuel pump 2 is adjusted according to the fuel consumed by the engine. . In FIG. 3, reference numeral 13 denotes an engine control device (EC) for controlling the operation of the fuel injection valve 5 according to the operating condition of the engine.
U) and 14 are voltage control devices that control the supply voltage of the fuel pump 2 according to a signal from the engine control device, that is, the required fuel amount.

When a signal corresponding to the required fuel amount is input from the engine control device 13 to the voltage control device 14, the voltage supplied to the fuel pump 2 is controlled by the voltage control device 14, and the fuel supply passage 3 is unnecessarily charged. This prevents the fuel pressure from rising and the overflow amount of the pressure adjusting unit 25 from increasing more than necessary.

[0015]

As described above, according to the present invention, since the fuel pump is an in-tank type and the surplus fuel is circulated in the fuel tank, the cost can be reduced by the simplification of the device and the fuel temperature can be increased by the heat of the engine. The effect that it can be prevented is obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a fuel supply device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the fuel pump of FIG.

FIG. 3 is a schematic configuration diagram showing a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a conventional fuel supply device.

[Explanation of symbols]

 1 Fuel Tank 2 Fuel Pump 3 Fuel Supply Passage 4 Delivery Pipe 5 Fuel Injection Valve 9 Pressure Regulator 13 Engine Control Device 14 Voltage Control Device 25 Pressure Regulator

Claims (2)

[Claims] 1. A fuel pump submerged in a fuel tank pressurizes and feeds the fuel in the fuel tank to a fuel injection valve disposed in an intake passage of an engine, and between the fuel injection valve and the fuel pump. In the fuel supply device in which the pressure regulator is arranged to adjust the fuel pressure, the pressure regulator closes the fuel supply passage when a predetermined pressure is reached, and the pressure regulator is provided in the fuel pump body. A fuel supply device for an engine, characterized in that a pressure regulator that operates at a pressure slightly higher than the pressure to be regulated is provided, and excess fuel circulates directly into the fuel tank by the pressure regulator. 2. The fuel supply device for an engine according to claim 1, wherein an input power supply voltage to the fuel pump is fed by a power supply voltage control device controlled according to a fuel consumption amount.