KR20010081582A - Cooling system for cooling fuel of a car - Google Patents

Abstract

PURPOSE: A fuel refrigerator for a vehicle is provided to improve the problems related with the increase of fuel temperature by attaching a fuel refrigerator in a diesel engine having a common rail and to protect a refrigerator and a return line. CONSTITUTION: A fuel refrigerator is formed by composing a fuel pipe of a return line with an aluminum tube(31), bending the aluminum tube on a protection panel(41) in a zigzag form, and installing a heat emission panel having many slits(42). The ends of the aluminum tube are connected to a return line and a fuel tank line. Fuel flowing out by passing through an engine passes the return line, and the temperature of the fuel is increased by high pressure. The temperature of the fuel falls while passing through the refrigerator, and the refrigerated fuel returns to a fuel tank. Therefore, the problems due to the increase of fuel temperature are avoided.

Description

Cooling system for cooling fuel of a car}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system for a fuel system of an automobile, and in particular, a protection panel function for cooling a fuel pipe between a fuel tank and an engine of a diesel engine using a common rail system and protecting the fuel pipe. It relates to a cooling device for automobile fuel to perform at the same time.

Much effort has been made to improve the performance and fuel efficiency regulations in diesel engines. Among them, the common rail method of diesel engines has been researched for the purpose of practical use in various automobiles to cope with the emission regulations. The common rail method is a fuel injection device of a diesel engine that includes high pressure pumping to increase the pressure to a high pressure, but the common rail method adopts an electronically controlled high pressure method, unlike a mechanical high pressure injection method. . Therefore, there is always a constant fuel in the common rail, and the temperature of the fuel increases due to the high pressure injection and the temperature inside the engine compartment. The temperature at this time is increased to about 110 ° C or more when the engine is subjected to severe conditions. Thus, the increased temperature returns to the fuel tank through the return line.

When the vehicle is in operation, such a situation is repeated, and if the temperature flowing into the common rail is 70 ° C or higher, it is difficult to accurately control the amount of fuel flowing into the engine combustion chamber due to the volume expansion of the fuel. Can be turned off. Therefore, the method of using a widely used heat exchanger is also considered, but the mounting space is often a problem because the height / width of the heat exchanger is large.

In addition, since the fuel line is connected from the fuel tank at the rear of the vehicle to the engine compartment at the front of the vehicle, it is technically difficult to install a heat exchanger in the engine compartment.

In the case of the conventional vehicle diesel engine, since the common rail method was not used, the aforementioned fuel line cooling device was not needed, and fuel was sufficiently cooled through the fuel tank and the fuel line of the general diesel engine. Cooling devices for other vehicle coolers or air conditioners are designed to maximize efficiency, but they have high efficiency but are difficult to install on the underside of vehicles. Moreover, the vehicle has a structure that is easily damaged by stones and sand coming in from the outside while driving.

The present invention is to install a fuel cooler in the fuel pipe of the return line is connected from the fuel tank to the engine room in order to solve the above problems.

In addition, because the distance from the road below the vehicle to the floor is limited, it is designed to be very different from the existing cooling system.In addition, the protection device needed to protect the cooling system of the fuel line from the splashing stones during driving It is characterized in that the structure is used at the same time as the heat sink of the cooling device.

In the fuel line cooling apparatus of the present invention, a protector is used in the fuel line to obtain a chipping characteristic that may be generated during vehicle operation, and the protector uses aluminum or a material having good thermal conductivity. And it is a structure that improves the chipping performance along with heat dissipation by mechanically or chemically bonding to the furnace line.

1 is a configuration of a common rail system of a vehicle having a fuel cooling device according to the present invention.

2 is a structural view of a fuel cooling device of a common rail system of a vehicle according to the present invention;

3 is a temperature characteristic diagram during an engine load test comparing the case where the fuel cooling device according to the present invention is installed and the conventional case.

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

1: high pressure pump 2: gas recovery line

3: return line 4: fuel cooling device

5: fuel tank 6: fuel filter

7: electronic control unit 31: aluminum tube

41: protection panel 42: slit

43: Clip

The present invention comprises an aluminum tube for the fuel pipe of the return line from the fuel tank to the engine room, and protects the cooling device from the foreign matter such as stones from the floor while driving the vehicle. It is configured to cool the fuel by installing a cooling device that is used as a cooling function by the heat sink together with the function of the panel.

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

As shown in FIG. 1, the fuel of the fuel tank 5 is supplied to the high pressure pump 1 via a fuel filter 6, and the high pressure pump 1 is an electronic control unit (ECU) 7. Under high pressure pump to inject the fuel to the common rail of the engine. At this time, the fuel passing through the engine through the common rail system passes along the return line (3), and the fuel heated by the high pressure passes through the fuel cooler (4) and drops in temperature to enter the fuel tank (5). Consists of Here, a vapor line 2 is further included between the upper end of the common rail and the fuel tank 5 to recover the vaporized fuel to the fuel tank.

As described above, in the present invention, the fuel return line 3 further includes the fuel cooler 4, and the fuel cooler has a structure as shown in FIG.

In FIG. 2, the fuel cooling device 4 comprises an aluminum tube 31 of the fuel pipe of the return line returned from the engine room to the fuel tank, and a protection panel for protecting the aluminum tube 31 of the fuel return line. Banded in a zigzag form to achieve heat exchange to (41), the protective panel 41 is configured in a form that protects the tube to maximize the cooling efficiency by using a press plate and protect the tube, a plurality of slits for cooling 42 is formed in a heat sink structure so that outside air can be cooled while passing through the slit 42 at the lower surface of the vehicle when traveling.

The method of fixing the aluminum tube 31 to the protective panel 41 is such that the heat exchange is sufficient to adhere to each other by brazing or mechanical bonding. And it is firmly fixed using the clip 43 to withstand the fatigue characteristics and tremors that may occur during the operation of the vehicle. The clip 43 is sandwiched between the aluminum tubes 31 to be in close contact with each other and fixed to the protective panel 41 to firmly fix the aluminum tube 31 from vibration or shaking.

In addition, the end of the fuel line, that is, the aluminum tube 31 is configured by appropriate processing (for example, connector coupling structure) to connect the line on the return side and the fuel tank side.

According to the present invention configured as described above, the fuel passing through the engine through the common rail system passes along the return line (3), wherein the fuel heated by the high pressure passes through the cooling device (4) and the temperature drops to the fuel tank (5). Go back to).

3 shows the results of the engine load test performed with and without the fuel cooler 4 attached to a diesel engine having a common rail system of 2200 cc. According to the result shown in FIG. 3, the fuel which passed through the fuel cooler in the case of the 25 degreeC room temperature test of external temperature shows about 7-8 degreeC temperature fall compared with the case without attaching a fuel cooler.

From these results, the fuel cooling device has been able to improve the problems caused by the fuel temperature rise in the common rail system.

As described in detail above, according to the present invention, a fuel cooler may be attached to a diesel engine having a common rail to improve other problems in increasing fuel temperature, and the fuel cooler simultaneously serves as a protective cover for the cooler and the return line. There is an effect that can be performed.

Claims (3)

In the fuel system of a vehicle using a common rail system, The fuel pipe of the fuel return line for recovering fuel from the common rail system to the fuel tank is composed of aluminum tubes, and the protection for protecting the aluminum tubes from foreign substances such as stones from the floor while driving the vehicle Cooling device for a vehicle fuel, characterized in that configured to cool the fuel by installing a cooling device used as a cooling function by the heat sink at the same time as the panel function. The method of claim 1, wherein the cooling device, Banded in a zigzag form to achieve heat exchange to the protection panel 41 for protecting the aluminum tube 31 of the fuel return line, the protection panel 41 can be maximized by using a press plate the cooling efficiency It is configured in the form of protecting the tube, and a plurality of slits 42 for cooling to form a heat sink structure so that the outside air can be cooled while passing through the slit 42 in the lower surface when the vehicle is running Chiller for automobile fuel. The structure for fixing the aluminum tube 31 to the protective panel 41, It is fixed to ensure sufficient heat exchange by attaching to each other by brazing or mechanical bonding, and firmly fixing aluminum tubes using clips 43 to sufficiently endure fatigue characteristics and vibrations that may occur during operation of the vehicle. Chiller for automobile fuel.