KR100559837B1 - a mutual aid system of fuel feeding system and air conditioning system for CNG vehicles - Google Patents

Abstract

The present invention relates to a complementary system of a fuel supply device and a cooling device of a compressed natural gas vehicle, wherein a low temperature fuel gas is discharged from the regulator 4 between the regulator 4 and the fuel amount control valve 7 of the fuel supply device. Is provided with a heat exchanger (17), and the heat exchanger (17) receives a high temperature refrigerant gas from the compressor (11) of the air conditioner and exchanges heat with the low temperature fuel gas introduced from the regulator (4). After the flow to the expansion valve 13, the low temperature fuel gas is heated by the high temperature refrigerant gas is configured to flow to the fuel amount control valve (7).

Therefore, the number of heat exchangers is reduced by sharing the heat exchanger 17 that the fuel supply device and the air conditioner can complement each other's thermal relationship, and the condensation performance by the low-temperature fuel gas is improved, thereby cooling the fan. By reducing the number and capacity of the components, the cost of the device is reduced, and the space in the engine room can be easily secured.

In addition, the overall cooling performance of the cooling device can also be improved due to the improvement of the condensation performance.

Fuel supply, air conditioner, heat exchanger,

Description

A mutual aid system of fuel feeding system and air conditioning system for CNG vehicles}

1 is a configuration diagram of a fuel supply device of a conventional compressed natural gas vehicle;

2 is a configuration diagram of a cooling apparatus of a conventional compressed natural gas vehicle;

3 is a configuration diagram of a complementary system of a fuel supply device and a cooling device according to the present invention;

4 is a schematic side view of a heat exchanger used in the present invention;

5 is a partially cutaway perspective view showing a detailed configuration of a heat exchanger used in the present invention,

FIG. 6 is a view illustrating a state in which an expansion space in which fuel gas passing through a heat exchanger and a bypass pipe are mixed is formed in the configuration diagram of FIG. 3.

* Description of the symbols for the main parts of the drawings *

1: electronic control unit, 2: gas tank,

3: lock valve, 4: regulator,

5: heat exchanger, 6: thermostat,

7: fuel control valve, 8: mixer,

9: throttle valve, 10: intake manifold,

11: compressor, 12: evaporator,

13: expansion valve, 14: condenser,

15: fan, 16: blower,

17: heat exchanger, 18: flow control valve,

19: bypass tube, 20: temperature sensor,

21: expansion space.

The present invention relates to a fuel supply device and a cooling device for a compressed natural gas vehicle, and more particularly, to a fuel supply device for a compressed natural gas vehicle, in which a condensation of a refrigerant is complementary to a heating and cooling device of a fuel in a fuel supply apparatus. And a complementary system of cooling systems.

As the air pollution caused by automobile exhaust gas enrichment, exhaust soot and NO _X, such as low content of the harmful components of natural gas vehicles within; the increasing use of (NGV Natural Gas Vehicle) and which, compressed in accordance with the use aspect of the fuel Compressed natural gas (CNG) vehicles using natural gas, liquefied natural gas (LNG) vehicles using natural gas in liquefied state, and adsorption natural gas (ANG) automatic used by absorbing and storing natural gas in fuel containers It is divided into cars.

Among them, the fuel supply device of the compressed natural gas vehicle includes a gas tank 2 in which compressed natural gas is stored, a lock valve 3 of the gas tank 2, and a gas tank ( 2) a regulator 4 for reducing the pressure of the fuel gas supplied from 2 bar (from 200 bar to 8 bar), a heat exchanger 5 for raising the temperature of the fuel gas using a heated engine coolant, and a discharge from the heat exchanger 5 If the temperature of the fuel gas is too high, the thermostat (6) to block the flow of cooling water to the heat exchanger (5) to maintain the temperature of the fuel gas below a certain level (about 40 ℃), the amount of fuel to adjust the supply amount of fuel Passes through the valve (7), the mixer (8) where the outside gas and fuel gas introduced through the air cleaner are mixed, the throttle valve (9) for adjusting the amount of the mixer mixed in the mixer (8), and the throttle valve (9). With an intake manifold (10) that distributes one mixer to each combustion chamber The lure is.

Therefore, when the start signal is input to the electronic control unit 1 by the driver's key operation, the electronic control unit 1 opens the lock valve 3 so that fuel can be supplied, and then the regulator 4 → The heat exchanger (5), the thermostat (6), the fuel amount control valve (7), the mixer (8), the throttle valve (9), and the intake manifold (10) are sequentially supplied to the combustion chamber.

On the other hand, the cooling device of the compressed natural gas vehicle is the same as that of a general vehicle, as shown in Figure 2, the high-temperature high-pressure gas introduced from the compressor 11, the compressor 11 for compressing the refrigerant gas by the engine power. Low-pressure low-pressure fog state by rapidly expanding the condenser 12 and the medium-temperature high-pressure liquid introduced from the condenser 12 through heat exchange with the outside air supplied by the fan 15 to phase-change into a medium-temperature high-pressure liquid The low-temperature low-pressure free refrigerant introduced from the expansion valve 13 and the expansion valve 13 to be changed (atomized) is exchanged with the air (inner or outdoor air) supplied by the blower 16 to make a low-temperature low-pressure gas state. It is composed of an evaporator 14, the low-temperature low-temperature gas refrigerant passing through the evaporator 14 is introduced into the compressor 11 again, it is circulated in the same path.

At this time, the evaporator 14 passes through the evaporator 14 to provide the evaporative heat to the freezing cool air is supplied to the room is cooled by the cooling air is made.

As described above, the fuel supply device and the cooling device, respectively, in the heat exchanger (5) and the compressor (11) for warming the fuel gas changed to a low temperature state (0 ~-3 ℃) while decompressing in the regulator (4) It is equipped with a condenser 12 which is a heat exchanger that cools the incoming high temperature (about 70 ° C.) high pressure refrigerant gas.

That is, the fuel supply device requires a heat exchanger for heating, and the air conditioner has a heat exchanger for cooling as one component.

Therefore, although the fuel supply device and the air conditioner can use each heat exchanger in common, since each device uses a separate heat exchanger, it is inefficient in terms of configuration and cost of the device, and the devices are all in the engine room. In view of being installed inside, there is a problem that does not benefit the space utilization in the engine room.

Accordingly, the present invention has been made to solve the above problems, by using the heat exchanger of the fuel supply device and the cooling device complementary to reduce the number of the heat exchanger and the condenser cooling fan, thereby reducing the cost and space in the engine room The purpose of the present invention is to provide a complementary system of a fuel supply device and a cooling device of a compressed natural gas vehicle in which the refrigerant condensation performance of the cooling device can be improved.

In order to achieve the above object, the present invention provides a heat exchanger through which a low temperature fuel gas flows from a regulator between a regulator of a fuel supply device and a fuel amount control valve, and the heat exchanger has a high temperature from a compressor of a cooling device. The refrigerant gas flows into the expansion valve after heat exchange with the low temperature fuel gas introduced from the regulator, and flows to the expansion valve. The low temperature fuel gas is heated by the high temperature refrigerant gas and flows to the fuel amount control valve.

That is, by cooling / condensing the high temperature refrigerant gas introduced from the compressor using the low temperature fuel gas introduced from the regulator, on the contrary, the low temperature fuel gas introduced from the regulator is heated by using the high temperature refrigerant gas introduced from the compressor. As the temperature can be raised to an appropriate temperature, mutual heat can be used complementarily.

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

Figure 3 shows the configuration of the complementary system of the fuel supply device and the cooling device of the compressed natural gas vehicle according to the present invention, as shown, the gas by opening the lock valve (3) of the electronic control unit (1) Fuel gas flows into the regulator 4 from the tank 2, and when the pressure of the fuel gas is reduced in the regulator 4, the temperature drops to 0 to -3 deg. C, and this low temperature fuel gas causes the heat exchanger 17 to After passing through the fuel flow control valve (7), and then mixed in the outside air in the mixer (8), the basic configuration of the fuel supply device supplied to each combustion chamber via the throttle valve (9) and the intake manifold (10) Same as before.

The present invention is characterized in that a high-temperature refrigerant gas is introduced from the compressor (11) constituting a cooling device instead of the cooling water supplied to the heat exchanger (17), and the refrigerant passing through the heat exchanger (17). Gas, of course, has the same circulation path that flows back into the compressor 11 through the expansion valve 13 and the evaporator 14 as in the prior art.

As shown in FIGS. 4 and 5, the heat exchanger 17 includes a high temperature side tube 17a through which a high temperature refrigerant gas flows from the compressor 11 in front of the outside air blown by the fan 15. The low temperature side tubes 17b into which the low temperature fuel gas flows from the regulator 4 behind the high temperature side tubes 17a are also layered in the same manner. Cores 17c, which are integrally formed over their widths (length from front to back), are provided between the layers to form an interconnected structure.

On the other hand, the present invention bypasses the heat exchanger 17 from the conduit connecting the regulator 4 and the heat exchanger 17 by a bypass pipe connecting the heat exchanger 17 and the fuel amount control valve (7) And a solenoid valve operated by a signal from the electronic control unit 1 at a connection point of the bypass line 19 and the conduit connecting the regulator 4 to the heat exchanger 17. When the current is off, the flow path is opened from the regulator 4 to the heat exchanger 17. When on, when the operating current is applied from the electronic control unit 1, the flow path of the heat exchanger 17 is blocked and the bypass pipe ( A flow path toward the side 19 is provided; and a flow path control valve 18 is installed, and a temperature sensing sensor 20 is installed in a pipe connecting the heat exchanger 17 and the fuel amount control valve 7. The temperature measured by this temperature sensor 20 is set to about 40 ° C as in the conventional case. C) In the following case, the electronic control unit 1 causes the refrigerant gas to flow from the regulator 4 to the heat exchanger 17, and when the measured temperature is higher than the set value, the refrigerant gas is exchanged through the bypass pipe 19. The flow path control valve 18 is controlled to bypass the machine 17 and enter the fuel amount control valve 7.

Hereinafter, the operation and effects of the present invention will be described.

When the fuel of the gas tank 2 passes through the regulator 4 through the lock valve 3 by the driver's start signal, the flow path regulating valve 18 is turned off, and the flow path opens toward the heat exchanger 17. It is.

Therefore, fuel gas whose temperature has dropped significantly due to the pressure drop in the regulator 4 is introduced into the low temperature side tube 17b on the rear side of the heat exchanger 17, and at this time, from the compressor 11 of the cooling device in operation. The high temperature refrigerant gas is introduced into the high temperature side tube (17a) located on the front of the heat exchanger (17).

Therefore, the heat of the high temperature side tube 17a is transferred to the low temperature side tube 17b through the core 17c to warm the low temperature fuel gas flowing therein, while the high temperature side tube ( The refrigerant gas of 17a) is cooled due to heat loss by an amount that warms the fuel gas of the low temperature side tube 17b, thereby condensing.

At this time, considering that the temperature of the outside air supplied by the fan 15 in the summer, when the air conditioner is operating significantly exceeds the room temperature, the temperature of the fuel gas passing through the low-temperature side tube (17b) is 0 ~-3 ℃ level Therefore, it can be seen that the cooling effect by the fuel gas is very large, and also because the air is blown out by the fan 15 to assist the condensation performance of the refrigerant gas is improved to improve the overall cooling performance.

In addition, since the condensation performance of the refrigerant gas by the fuel gas is excellent as described above, it is not necessary for the fan 15 to be entirely responsible for cooling the refrigerant gas in the related art, and thus the fan 15 has a smaller capacity than the conventional one. There is an advantage to be able to use or reduce the number of installation.

On the other hand, the refrigerant condensed through the above process is circulated in the normal path flowing into the expansion valve (13, see Fig. 2), the heated fuel gas is passed through the parts after the fuel flow control valve (7) of the engine It is supplied to each combustion chamber.

At this time, the temperature of the heated fuel gas discharged through the heat exchanger 17 is continuously measured by the temperature sensor 20 installed on the conduit and input to the electronic control unit 1, the electronic control unit ( 1), as described above, when the temperature of the input fuel gas rises above the set value (about 40 ° C.), the flow path control valve 18 is turned on to block the flow path toward the heat exchanger 17. Opening the flow path on the side of the pass pipe 19 allows the fuel gas to bypass the heat exchanger 17 and flow to the fuel amount control valve 7.

On the other hand, as described above, when the entire amount of fuel gas bypasses the heat exchanger 17 and is supplied to the combustion chamber through the fuel amount control valve 7 at an excessively low temperature, deterioration of startability and combustion efficiency may occur. It is also possible to solve the problem by installing a fuel preheating device, and also by adjusting the valve structure in the flow path control valve 18 to completely block the flow path toward the heat exchanger 17 during on operation by the electronic control unit 1. When the expansion space 21 is formed in the connection portion between the outlet line of the heat exchanger 17 and the bypass pipe 19 to maintain the open state, the heat exchanger 17 passes through the expansion space 21 The heated fuel gas and the unheated fuel gas are mixed through the bypass pipe 19 to be supplied to the combustion chamber through the fuel amount control valve 7 at an appropriate temperature. At this time, the control of the flow path control valve 18 by the temperature sensor 20 and the electronic control unit 1 is made the same, thereby preventing the fuel from overheating and enabling the fuel to be supplied at an appropriate temperature level.

As described above, according to the present invention, the fuel supply device and the air conditioner share one heat exchanger and complementarily use and operate heat (temperature) of each other, thereby reducing the number of heat exchangers and improving condensation performance. By reducing the number and capacity of the cooling fan is not only a low cost in the configuration of the device, it is easy to secure the installation space in the engine room, there is an effect that can be used in the arrangement of the other devices the free space thus formed.

In addition, as described above, the refrigerant cooling capacity of the low-temperature fuel gas is large, so that the high-temperature refrigerant gas supplied from the compressor is more condensed than in the conventional case--condensation in the condenser that exchanges heat with the air blown by the fan--condensation performance thereof. As a result, the improvement of the overall cooling performance of the air conditioner can be expected.

Claims (4)

Between the regulator 4 of the fuel supply device and the fuel amount regulating valve 7, a heat exchanger 17 through which low-temperature fuel gas flows in is provided, and the heat exchanger 17 is provided with a cooling device. The refrigerant gas of high temperature flows from the compressor (11), exchanges heat with the fuel gas of low temperature introduced from the regulator (4), condenses it, and flows to the expansion valve (13). The fuel gas of low temperature is caused by the refrigerant gas of high temperature. Complementary system of a fuel supply device and a cooling device of a compressed natural gas vehicle configured to be heated and flow to a fuel amount control valve (7). 2. The heat exchanger (17) according to claim 1, wherein the heat exchanger (17) has a high-temperature side tube (17a) in which the refrigerant gas flows from the compressor (11) in front, and is arranged in layers, and a regulator (4) behind the high-temperature side tube (17a). The low temperature side tubes 17b into which the fuel gas flows from are arranged in the same manner, and the two side tubes have a structure in which cores 17c are integrally installed across their widths and are interconnected. Complementary system of fuel supply system and cooling system of compressed natural gas automobile. 2. The bypass tube (19) according to claim 1, wherein a bypass pipe (19) bypassing the heat exchanger (17) is formed between the regulator (4) and the fuel amount control valve (7). 4) the flow path control valve 18 is installed at the connection point of the pipe connecting the heat exchanger 17, the temperature sensor 20 is installed in the outlet side of the heat exchanger 17, the electronic control If the temperature measured by the temperature sensor 20 is less than or equal to the set value, the unit 1 maintains the flow control valve 18 in the off state to allow the refrigerant to flow toward the heat exchanger 17. The flow path between the fuel supply device and the cooling device of the compressed natural gas vehicle is characterized in that the flow control valve 18 is turned on to block the flow path toward the heat exchanger 17 and open the flow path toward the bypass pipe 19. Complementary system. 4. The flow path control valve (18) of claim 3 does not completely block the flow path toward the heat exchanger (17) when turned on, and at the connection point between the bypass pipe (19) and the heat exchanger (17) outlet side pipe line. Complementary system of the fuel supply device and the cooling device of the compressed natural gas vehicle, characterized in that the expansion space 21 is formed.

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