KR20120059750A - Structure for preventing fuel freezing of diesel vehicle using collecting fuel - Google Patents

Abstract

PURPOSE: An anti-fuel freeze structure for diesel vehicles through a fuel recovery is provided to prevent diesel fuels from being frozen in a fuel filter and a fuel line without using a heater. CONSTITUTION: An anti-fuel freeze structure for diesel vehicles through a fuel recovery comprises a fuel tank(10), a fuel filter(20), a fuel pump(30), a common rail(40), an injector(50), an ECU(Engine control unit)(60), a motor(70), and a battery(80). The fuel filter removes foreign materials transferred from the fuel tank. The fuel pump supplies the fuel transferred from the fuel filter to an engine. The common rail and injector injects the fuels supplied from the fuel pump into the engine. The ECU controls operation of the engine and a supply of the fuels. One side of the motor is connected to the fuel tank and the other side is connected to the fuel filter. The battery supplies power to the ECU and motor.

Description

Structure for preventing fuel freezing of diesel vehicle using collecting fuel}

The present invention relates to a fuel freeze protection structure of a diesel vehicle, and more particularly to a fuel freeze protection structure that can prevent the freezing of fuel exposed to the outside of the vehicle without using a heater under cold weather conditions.

In general, diesel engines are widely used in various fields such as industrial, ships, and vehicles because of their high thermal efficiency and low fuel cost, and they improve output performance and reduce soot by improving fuel injection method and engine rotation method. Improvements have been made steadily, increasing the scope and scope of application.

In addition, diesel oil, which is used as a fuel of a diesel engine, contains a large amount of impurities and water, and thus a filtering process is required to remove it, and a fuel filter is used for filtering.

That is, as shown in FIG. 1, fuel is supplied from the fuel tank 1 to the fuel filter 2 to remove impurities, and then to the injector 5 via the fuel pump 3 and the common rail 4. As a result, diesel fuel is injected into the engine.

By supplying pure diesel fuel through the fuel filter to the engine in this way, it is possible to prevent damage and failure of the engine due to impurities in advance, and complete combustion is achieved due to the vaporization of pure fuel alone to release the exhaust gas by incomplete combustion. Minimization can reduce environmental pollution caused by exhaust gases.

However, due to the characteristics of diesel fuel, paraffin is included among the impurities contained in the fuel. Paraffin is an additive that must be included in diesel fuel due to its excellent ignition performance and high calorific value. It has the property of solidifying in wax form.

In particular, when the temperature is lowered in winter, such as cold below -17 ℃, the viscosity of the paraffin contained in the fuel increases to solidify the filter cartridge, etc., the flow of fuel supplied to the fuel filter is reduced and the supply of fuel It becomes unstable, the engine is turned off or excessive white smoke is generated, and while driving the vehicle, there are many problems such as insufficient output or poor acceleration.

Therefore, in order to solve the above problems, a heating system has been applied to the fuel filter to enable smooth fuel supply by lowering the viscosity of the solidified diesel fuel. In addition, the heating system instantaneously heats the localized area, which is ineffective in reducing the viscosity of the solidified fuel. In addition, a fuel tank, a fuel filter, and a pipe connecting the fuel are generally located outside the vehicle. Heating alone does not prevent solidification of the fuel remaining inside the fuel system, and the same problem as described above occurs.

An object of the present invention for solving the above problems, to recover the fuel remaining in the fuel filter and each line, to provide a fuel freeze prevention structure that can prevent the refrigeration of cold weather without using a separate heater. To be.

The configuration of the present invention for achieving the above object, a fuel tank for storing diesel fuel, a fuel filter for removing impurities of the fuel transferred from the fuel tank, a fuel for supplying the fuel transferred from the fuel filter to the engine A pump, a common rail and injector for injecting fuel supplied from the fuel pump to an engine, an ECU for controlling engine operation and supply of fuel, one side of which is connected to the fuel tank and the other side of which is connected to the fuel filter to supply fuel It is characterized in that it comprises a motor for recovering, the ECU and the battery for supplying power to the motor.

The fuel cell may further include a first line connecting the fuel tank and the motor, a second line connecting the motor and the fuel filter, and a third line connecting the fuel tank and the fuel filter.

Furthermore, the motor includes a pump for generating a flow of fuel and air transferred to the fuel tank and the fuel filter, and includes 4/2 to selectively open and close an internal flow path according to a starting state of the vehicle. More preferably.

The effect of the present invention having the configuration described above is that when the vehicle is stopped, the fuel filter and the fuel remaining in each line can be recovered to the fuel tank by the operation of the motor, so even if a separate heater is not used, Even in poor climates, it is possible to fundamentally prevent the freezing of diesel fuel in fuel filters and on each line.

In addition, when the vehicle is started, fuel can be preferentially supplied from the fuel tank to the fuel filter and each line by the operation of the motor, thereby improving engine startability, reducing vehicle manufacturing cost, and improving driver convenience. You can.

1 is a schematic diagram showing a fuel supply process used in the prior art.
Figure 2 is a schematic diagram showing a process in which fuel is transferred in accordance with the present invention when the vehicle stops starting.
Figure 3 is a schematic diagram showing the process of fuel transfer in accordance with the present invention when the vehicle is started.
4 is a schematic diagram showing a process of passing fuel through a motor when the vehicle stops starting;
5 is a schematic diagram showing a process of passing fuel through a motor when the vehicle is started;
6 is a flowchart illustrating a process in which fuel is transferred when the vehicle stops starting.
7 is a flowchart illustrating a process in which fuel is transferred when the vehicle is started.

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

The fuel freeze prevention structure of the diesel vehicle using the fuel recovery of the present invention is a fuel tank 10 for storing diesel fuel, a fuel filter 20 for removing impurities from the fuel transferred from the fuel tank 10, the fuel filter A fuel pump 30 for supplying fuel transferred from the engine to the engine, a common rail 40 and an injector 50 for injecting the fuel supplied from the fuel pump 30 to the engine, engine operation and supply of fuel ECU 60 for controlling the motor, one side is connected to the fuel tank 10 and the other side is connected to the fuel filter 20 to supply or withdraw the fuel 70, the ECU 60 and the motor 70 It characterized in that it comprises a battery 80 for supplying power.

The fuel supply device applied to a commercial vehicle is mainly installed on the outside of the vehicle, and thus the fuel tank, the fuel filter, and each line are positioned to directly contact the outside atmosphere.

As a result, diesel fuels using a mixture of paraffins are easily solidified in the form of wax (WAX) in cold weather, such as winter, especially in the fuel filter to remove impurities contained in diesel fuel, the fuel flow These problems resulted in lowering of fuel, unstable fuel supply, and poor vehicle running performance.

In particular, the present invention can fundamentally prevent the phenomenon of fuel solidification even under conditions such as cold weather by recovering the fuel remaining in the fuel system without applying a heating system used in a fuel filter or the like.

That is, as shown in Figures 2 and 3, the fuel tank 10, the fuel filter 20, the fuel pump 30, the common rail 40, the injector 50 and the like are used in the conventional diesel vehicle The same as, but provided between the fuel tank 10 and the fuel filter 20 is provided with a motor 70 for supplying or recovering fuel, the motor 70 is connected to the ECU 60 by the engine It further comprises a battery (80) for controlling the operation and supply of fuel, and for supplying power to the ECU (60) and the motor (70).

Accordingly, the diesel fuel remaining in the fuel filter 20 and each line may be recovered by the operation of the motor 70, and the diesel fuel may be preferentially supplied to the fuel filter 20 and each line. As a result, freezing of the diesel fuel can be prevented, as well as improvement in starting performance and convenience of the vehicle.

Further, the present invention, the first line 91 to provide a fuel passage between the fuel tank 10 and the motor 70, the movement of the fuel between the motor 70 and the fuel filter 20 It is preferable to further include a second line 92 for providing a passage and a third line 93 for providing a passage for moving the fuel between the fuel tank 10 and the fuel filter 20.

Hereinafter, the operation of the present invention according to the starting process of the vehicle will be described in more detail with reference to the accompanying drawings.

First, when stopping the start of the vehicle, the flow of fuel continuously supplied from the fuel tank 10 to the engine is cut off abruptly, so that fuel remains in the fuel filter 20 and each line. As shown in FIG. 6, in the present invention, the remaining fuel is recovered and transferred back to the fuel tank 10, thereby preventing freezing of the fuel.

That is, when the vehicle stops starting, the ECU 60 senses the temperature of the atmosphere, and when the temperature of the atmosphere is less than or equal to a preset temperature (preferably -10 ° C or less), the motor 70 is forwarded. In this case, the forward direction means a direction from the fuel tank 10 toward the motor 70, and the air inside the fuel tank 10 is operated by the operation of the motor 70. It is transferred to the fuel filter 20 via the second line 92 through the first line 91 and the motor 70.

In this way, since the air filled in the fuel tank 10 needs to be discharged to the outside of the fuel tank 10 as necessary, the first line 91 is connected to the upper end of the fuel tank 10 to provide air. It is good to be made to inhale.

Thereafter, the fuel remaining in the fuel filter 20 is pushed out by the air transferred to the fuel filter 20, and the fuel is transferred to the fuel tank 10 through the third line 93. In addition, all of the diesel fuel remaining in the fuel filter 20 and each line will be recovered to the fuel tank 10.

When all of these fuel recovery processes are completed, the ECU 60 and the motor 70 which have controlled the engine operation and the fuel supply are cut off to maintain the stopped state.

In addition, it is more preferable that an air hole is formed at the upper end of the fuel tank 10 to equilibrate the pressure inside the fuel tank 10 with the atmospheric pressure outside, and thus the fuel tank 10 at the time of fuel consumption. Not only can the pressure inside be lowered, but the pressure inside the tank can be prevented from rising during the fuel supply.

On the contrary, when starting the vehicle which has stopped, since only the air is filled in the said fuel filter 20 and each line, and the fuel is not filled, it is necessary to supply fuel preferentially.

Therefore, as shown in FIGS. 3 and 7, when the vehicle is started, the ECU 60 first checks whether the fuel is recovered in the fuel filter 20 and each line.

If the temperature of the air is higher than the preset temperature, the fuel filter 20 and the respective lines are filled with the fuel as it is without undergoing a recovery process of the salping fuel, and the engine is immediately started.

However, when the temperature of the air is less than or equal to the preset temperature, since the fuel remaining in the fuel filter 20 and each line has been recovered to the fuel tank 10, it is determined whether to recover fuel through the ECU 60. After checking, the motor 70 is operated in the reverse direction.

The reverse direction means a direction opposite to the above forward direction. The air filled in the fuel filter 20 passes through the first line 91 through the second line 92 and the motor 70. The fuel tank 10 is transferred to the fuel tank 10, whereby the inside of the fuel filter 20 maintains a relatively negative pressure (−pressure).

Accordingly, fuel is transferred from the fuel tank 10 to the fuel filter 20 through a third line 93 connecting the fuel tank 10 and the fuel filter 20 to the fuel filter 20. Each line is filled with fuel, and then the engine is started.

The empty fuel filter 20 and the time to fill all the fuel in each line are determined according to the capacity of the motor 70, so that the motor 70 is installed while varying according to the type of vehicle and the required specifications. In addition, it takes a little time until all the fuel is filled, but it takes time to operate the preheat heater until the start, the motor 70 in consideration of the operating time of the preheat heater according to the ambient temperature The capacity and the ECU 60 can be set.

In addition, when the vehicle is stopped, the fuel tank 10 is positioned at the upper end of the fuel tank 10 in consideration of the intake of air from the first line 91. After the fuel is transferred through the line 93 to fill the fuel filter 20, the fuel continuously supplied passes through the second line 92, the motor 70, and the first line 91. 10), it is sufficient to just spray the recovered fuel inward from the top of the fuel tank (10).

The motor 70 used in the recovery and supply of the fuel as described above comprises a pump 71 for generating a flow of fuel and air transferred to the fuel tank 10 and the fuel filter 20, More preferably, it comprises a 4/2 way valve 72 for selectively opening and closing the flow path in accordance with the starting state of the vehicle.

That is, as shown in Figures 4 and 5, the pump 71 is located to generate a flow of fuel and air, both ends of the pump 71 are two of the 4/2 way valve 72 It is connected to two ports.

In addition, one side of the 4/2 way valve 72 is connected to the fuel tank 10 by connecting the first line 91 to the other side of the 4/2 way valve 72. It is connected to the line 92 and the fuel filter 20.

This 4/2 way valve 72 means a four-port two-way valve, and a total of four outlets are formed in one valve, and are formed to regulate flow in two directions as a whole.

That is, as shown in FIG. 4, when the vehicle is stopped, the signal is transmitted from the ECU 60 to the 4/2 way valve 72 to be inside the 4/2 way valve 72. Position the opening and closing portion 73 formed in the vertical direction, thereby closing the two flow paths located in the diagonal direction of the four flow paths formed inside the 4/2 way valve 72, two flow paths located in the vertical direction Will open.

Therefore, fuel tank 10-first line 91-4/2 way valve 72-pump 71-4/2 way valve 72-second line 92-fuel filter 20 A third line 93 is formed to flow to the fuel tank 10 and remains in the fuel filter 20 and each line while transferring the air in the fuel tank 10 to the fuel filter 20. The fuel is pushed out and recovered to the fuel tank 10.

In contrast, as shown in FIG. 5, when the vehicle is started, a signal is transmitted from the ECU 60 to the 4/2 way valve 72 so as to be inside the 4/2 way valve 72. Position the opening and closing portion 73 formed in the horizontal direction, thereby closing the two flow paths located in the vertical direction inside the 4/2 way valve 72, while opening the two flow paths located in the diagonal direction. .

Therefore, fuel tank 10-third line 93-fuel filter 20-second line 92-4/2 way valve 72-pump 71-4/2 way valve 72 A flow leading to the first line 91 and the fuel tank 10 is formed, and a negative pressure is formed inside the fuel filter 20 to naturally fill the fuel from the fuel tank 10 to the fuel filter 20. Make sure

Since the flow of fuel and air can be set in two directions respectively under the control of the ECU 60 by the 4/2 way valve 72 as described above, the pump 71 always operates in the same one direction. Done.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

10: fuel tank 20: fuel filter
30: fuel pump 40: common rail
50: injector 60: ECU
70: motor 71: pump
72: 4/2 way valve 73: opening and closing part
80 battery 91 first line
92: second line 93: third line

Claims (4)

A fuel tank 10 for storing diesel fuel;
A fuel filter 20 for removing impurities of fuel transferred from the fuel tank 10;
A fuel pump 30 for supplying fuel transferred from the fuel filter 20 to an engine;
A common rail 40 and an injector 50 for injecting fuel supplied from the fuel pump 30 to the engine;
An ECU 60 for controlling engine operation and supply of fuel;
A motor 70 having one side connected to the fuel tank 10 and the other side connected to the fuel filter 20 to supply or recover fuel;
And a battery (80) for supplying power to the ECU (60) and the motor (70).
The method of claim 1,
First line 91 connecting the fuel tank 10 and the motor 70, a second line 92 connecting the motor 70 and the fuel filter 20 and the fuel tank 10 And a third line (93) connecting the fuel filter (20) to the fuel freezing prevention structure of the diesel vehicle using the fuel recovery.
The method of claim 1 or 2, wherein the motor 70,
And a pump (71) for generating a flow of fuel and air transferred to the fuel tank (10) and the fuel filter (20).
The method of claim 1 or 2, wherein the motor 70,
And a 4/2 way valve (72) for selectively opening and closing the flow path therein according to the starting state of the vehicle.

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