Water-cooled intercooler system using air conditioning system and control method thereof

A water-cooled intercooler system using an air conditioning system, may include a water-cooled intercooler for cooling intake air compressed in a turbocharger by cooling water, a water pump for supplying the cooling water to the water-cooled intercooler, and a radiator of the water-cooled intercooler for cooling the cooling water by traveling wind or fan wind, wherein the intercooler system may include a bypass line allowing a condenser of the air conditioning system and a compressor of the air conditioning system to fluidly communicate with each other and passing through the interior of a surge tank of the radiator of the water-cooled intercooler.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority to Korean Patent Application No. 10-2015-0153895 filed on Nov. 3, 2015, which is incorporated herein by reference in its entirety.

BACKGROUND OF THE INVENTION

Field of the Invention

Exemplary embodiments of the present invention relate to a water-cooled intercooler system using an air conditioning system and a method of controlling the intercooler system and more particularly, to a water-cooled intercooler system using the air conditioning system to enhance cooling efficiency of the water-cooled intercooler and a method of controlling the intercooler system.

Description of Related Art

In general, a turbocharger is a supercharging structure that compresses intake air to be supplied to an intake manifold of an engine by means of discharging force of exhaust gas and supplies the compressed intake air into cylinders so that it enhances efficiency of charging intake air of the engine and also increases a mean effective pressure and thereby increases output.

Such a turbocharger is of a structure that a conventional compressor and a turbine are arranged on a coaxial line, the turbine is forced to rotate by means of discharging force of exhaust gas discharged through an exhaust pipe and thus the compressor arranged on the coaxial line with the turbine is forced to rotate, and thereby inflow air flowing through an intake manifold is compressed and supplied into cylinders.

Meanwhile, since the air compressed by the turbocharger as described above is heated to a higher temperature, if such air is fed into combustion chambers as it is, an increasing rate of air density decreases and thus, it is likely to decrease the charging efficiency or cause knocking. It is an intercooler that is provided to lower temperature of the supercharged air.FIGS. 1 and 2show diagrams for illustrating a conventional intercooler respectively. Referring toFIGS. 1 and 2, intake air cooled while passing through the intercooler is maintained at a high density and cooled down to a lower temperature and thereby combustion performance is increased.

The intercooler is typically divided into an air-cooled intercooler and a water-cooled intercooler depending on cooling types. The air-cooled intercooler is of a structure that the supercharged air is forced to be cooled by cold air passing through cooling pins formed integrally on a multiple of tubes while it passes through the multiple of tubes. On the contrary, the water-cooled intercooler is of a structure that the supercharged air is forced to be cooled by means of a coolant flow circuit that is in contact with the tubes.

In general, there is a problem that the air-cooled intercooler has good cooling efficiency, but it is difficult to expect stable efficiency due to changes in ambient temperature. Accordingly, a recent trend is that applications of the water-cooled intercooler are increased. However, there was a problem in the water-cooled intercooler in that although it can maintain stable efficiency, its cooling efficiency is lower than that of the air-cooled intercooler.

BRIEF SUMMARY

Various aspects of the present invention are directed to providing a water-cooled intercooler system using an air conditioning system to allow cooling water of the intercooler system to be cooled by means of refrigerant in a condensed liquid state of the air conditioning system, and a method of controlling the intercooler system.

In accordance with an embodiment of the present invention, the present invention provides a water-cooled intercooler system using an air conditioning system comprising a water-cooled intercooler110for cooling intake air compressed in a turbocharger by means of cooling water; a water pump120for supplying the cooling water to the water-cooled intercooler110; and a radiator130of the water-cooled intercooler for cooling the cooling water by means of traveling wind or fan wind, characterized in that the water-cooled intercooler system comprises a bypass line230allowing a condenser210of the air conditioning system and a compressor220of the air conditioning system to fluidly communicate with each other and passing through the interior of a surge tank131of the radiator130of the water-cooled intercooler.

According to an exemplary embodiment of the present invention, the water-cooled intercooler system using the air conditioning system comprises a first valve310mounted in the bypass line230to open or close the bypass line230.

According to an exemplary embodiment of the present invention, the water-cooled intercooler system using the air conditioning system comprises an expansion line250for allowing the condenser210of the air conditioning system and an expansion valve240to fluidly communicate with each other.

According to an exemplary embodiment of the present invention, the water-cooled intercooler system using the air conditioning system comprises a second valve320mounted in the expansion line250to open or close the expansion line250.

According to an exemplary embodiment of the present invention, the water-cooled intercooler system using the air conditioning system comprises an evaporation line270for allowing the expansion valve240and a heat core260to fluidly communicate with each other.

According to an exemplary embodiment of the present invention, the water-cooled intercooler system using the air conditioning system comprises a compression line280for allowing the heat core260and the compressor220of the air conditioning system to fluidly communicate with each other.

According to an exemplary embodiment of the present invention, the water-cooled intercooler system using the air conditioning system comprises a condensation line290for allowing the compressor220of the air conditioning system and the condenser210of the air conditioning system to fluidly communicate with each other.

In accordance with another embodiment of the present invention, the present invention provides a method of controlling a water-cooled intercooler system using an air conditioning system, comprising steps of: determining whether indoor cooling is in the process of being carried out (S100); determining whether if the indoor cooling is in the process of being carried out, it is required to perform further cooling of cooling water of the water-cooled intercooler system (S200); and opening a first valve310and a second valve320when it is determined to require the further cooling of the cooling water of the water-cooled intercooler system (S300).

According to an exemplary embodiment of the present invention, the method of controlling a water-cooled intercooler system using an air conditioning system further comprises a second control step S400of closing the first valve310and opening the second valve320when it is determined at the determining step S200that the further cooling of the cooling water of the water-cooled intercooler system is required.

According to an exemplary embodiment of the present invention, the method of controlling a water-cooled intercooler system using an air conditioning system further comprises a third step S500of opening the first valve310and closing the second valve320when it is determined, at the step S100of determining whether the indoor cooling is in the process of being carried out, that the indoor cooling is not in the process of being carried out.

According to an exemplary embodiment of the present invention, the method of controlling a water-cooled intercooler system using an air conditioning system is characterized in that if temperature of intake air at an outlet of the water-cooled intercooler110is equal to or higher than a predetermined reference temperature at the determining step S200, it is determined that the further cooling of the cooling water of the water-cooled intercooler system is required.

DETAILED DESCRIPTION

The terms and words used in the specification and claims should not be construed as their ordinary or dictionary sense. On the basis of the principle that the inventor can define the appropriate concept of a term in order to describe his/her own invention in the best way, it should be construed as meaning and concepts for complying with the technical idea of the present invention. Accordingly, the embodiments described in the present specification and the construction shown in the drawings are nothing but one exemplary embodiment of the present invention, and it does not cover all the technical ideas of the invention. Thus, it should be understood that various changes and modifications may be made at the time of filing the present application. In addition, detailed descriptions of functions and constructions well known in the art may be omitted to avoid unnecessarily obscuring the gist of the present invention. Exemplary embodiments of the present invention will be described below in more detail with reference to the accompanying drawings.

FIG. 3illustrates a block diagram of a water-cooled intercooler system using an air conditioning system according to an exemplary embodiment of the present invention andFIG. 4illustrates a perspective view and an enlarged perspective view of a water-cooled intercooler system using an air conditioning system according to an exemplary embodiment of the present invention. Referring toFIGS. 3 and 4, a water-cooled intercooler system using an air conditioning system according to an exemplary embodiment of the present invention includes a water-cooled intercooler110, a water pump120, a radiator130of the water-cooled intercooler and a bypass line230.

The water-cooled intercooler110serves to cool intake air compressed in a turbocharger by means of cooling water. The water pump120serves to supply cooling water to the water-cooled intercooler110. The radiator130of the water-cooled intercooler serves to allow the cooling water to be cooled by traveling wind or fan wind.

In addition, the bypass line230is arranged to allow a condenser210of the air conditioning system and a compressor220of the air conditioning system to fluidly communicate with each other and pass through the interior of a surge tank131of the radiator130of the water-cooled intercooler. In this case, the condenser210of the air conditioning system serves to condense refrigerant (hereinafter, simply referred to “refrigerant”) in a gaseous state under high pressure of the air conditioning system and change its phase to a liquid state, while the compressor220of the air conditioning system serves to compress refrigerant in a gaseous state under low pressure into a high pressure gaseous state.

In other words, heat exchange between the cooling water and the refrigerant is induced by allowing the refrigerant in a liquid state condensed in the condenser210of the air conditioning system to pass through the bypass line230within the surge tank131of the radiator130of the water-cooled intercooler. Accordingly, the cooling water of the radiator130of the water-cooled intercooler is primarily cooled through heat exchange with atmosphere by traveling wind or fan wind, and then further cooled secondarily by the refrigerant in a liquid state condensed in the condenser210of the air conditioning system. Therefore, with the bypass line230mounted, it is possible to increase cooling efficiency of the cooling water of the water-cooled intercooler110and ultimately increase efficiency of cooling intake air. Thereafter, the refrigerant of which heat has been exchanged while passing through the bypass line230is returned back to the compressor220of the air conditioning system.

The water-cooled intercooler system using the air conditioning system may include a first valve310mounted in the bypass line230to open or close the bypass line230. In addition, the water-cooled intercooler system using the air-conditioning system may include an expansion line250allowing the condenser210of the air conditioning system and an expansion valve240to fluidly communicate with each other and a second valve320mounted in the expansion line250to open or close the expansion line250. In this case, the expansion valve240serves to expand the refrigerant in a liquid state under high pressure so as to be easily vaporized. Further, the refrigerant in a liquid state condensed in the condenser210of the air conditioning flows within the expansion line240.

That is, as the present invention utilizes the air conditioning system, it is necessary to constitute an operation manner in case where the air conditioning system is operated for indoor cooling differently from an operation manner in case where the air conditioning system does not do so. Therefore, the first valve310and the second valve320are mounted to open or close the bypass line230and the expansion line250respectively such that operation of the intercooler system at the time when indoor cooling is in the process of being carried out is performed differently from that at the time when the water-cooled intercooler system is cooled. Operation of the present invention will be described later.

The water-cooled intercooler system using the air conditioning system includes an evaporation line270, a compression line280, and a condensation line290. The evaporation line270serves to allow the expansion valve240and a heat core260to fluidly communicate with each other. In this case, the heat core260serves to vaporize refrigerant in a liquid state and allows the external air around the heat core260to be cooled by means of an endothermic reaction at the time of vaporizing the refrigerant. At this time, the refrigerant in a liquid state compressed in the expansion valve240flows within the evaporation line270.

In addition, the compression line280serves to allow the heater core260and the compressor220of the air conditioning system to fluidly communicate with each other. At this time, the refrigerant in a gaseous state vaporized in the heat core260flows within the compression line280.

Further, the condensation line290serves to allow the compressor220of the air conditioning system and the condenser210of the air conditioning system to fluidly communicate with each other. At this time, the refrigerant in a gaseous state under high pressure compressed in the compressor220of the air conditioning system flows within the condensation line290.

FIGS. 5 to 7are diagrams illustrating operation state of a water-cooled intercooler system using an air conditioning system according to an exemplary embodiment of the present invention andFIG. 8is a flow chart of a method of controlling a water-cooled intercooler system using an air conditioning system by a controller, according to another embodiment of the present invention. The term “controller” refers to a hardware device including a memory and a processor configured to execute one or more steps interpreted as an algorithm structure. The memory stores algorithm steps, and the processor specifically executes the algorithm steps to perform one or more processes to be described inFIGS. 5-8.

Referring toFIGS. 5 to 7, a method of controlling a water-cooled intercooler system using an air conditioning system, according to another embodiment of the present invention, includes steps of: determining whether indoor cooling is in the process of being carried out (S100), determining whether if the indoor cooling is in the process of being carried out, it is required to perform further cooling of cooling water of the water-cooled intercooler system (S200), and opening a first valve and a second valve when it is determine to require the further cooling of the cooling water of the water-cooled intercooler system (S300).

In addition, the method is characterized in that if temperature of intake air at an outlet of the water-cooled intercooler is equal to or higher than a predetermined reference temperature at the determining step S200, it is determined that the further cooling of the cooling water of the water-cooled intercooler system is required. That is, as the air (i.e., intake air) compressed by a turbocharger is heated to a higher temperature, if such air is fed into combustion chambers as it is, an increasing rate of air density decreases and thus, charging efficiency is decreased or knocking is caused. Therefore, in order to prevent such phenomenon, determining whether the further cooling of the cooling water is required is carried out based on comparison between the temperature of intake air at the outlet of the water-cooled inter cooler and the predetermined reference temperature. In this case, the predetermined reference temperature is a temperature that decreases charging efficiency or causes knocking and may be set depending on types of vehicles.

Further, opening the first and second valves is carried out at the first control step S300(seeFIG. 7). Accordingly, a portion of refrigerant in a liquid state condensed in the condenser210of the air conditioning system passes through a radiator130of the water-cooled intercooler through the bypass line230, and then further cools the cooling water in a surge tank131of the radiator130of the water-cooled intercooler. At the same time, a portion of refrigerant in a liquid state condensed in the condenser210of the air conditioning system is supplied to the expansion valve240and then vaporizes in the heat core260, thereby indoor cooling of a vehicle is accomplished.

The method of controlling a water-cooled intercooler system using an air conditioning system further includes a second control step S400of closing the first valve and opening the second valve when it is determined at the determining step S200, that the further cooling of the cooling water of the water-cooled intercooler system is not required (seeFIG. 5).

That is, if temperature of intake air is less than the predetermined reference temperature and thus, no further cooling of the cooling water is required, all of the refrigerant in a liquid state condensed in the condenser210of the air conditioning system is supplied to the expansion valve240and then vaporizes in the heat core260, and in doing so, it is used for cooling the interior of a vehicle. Accordingly, efficiency of cooling the interior of a vehicle is increased.

The method of controlling a water-cooled intercooler system using an air conditioning system further includes a third step S500of opening the first valve and closing the second valve when it is determined, at the step S100of determining whether the indoor cooling is in the process of being carried out, that the indoor cooling is not in the process of being carried out (seeFIG. 6).

That is, if it is determined that the indoor cooling is not in the process of being carried out, it is allowed to make heat exchange between all of the refrigerant in a liquid state condensed in the condenser210of the air conditioning system and the cooling water in the surge tank131of the radiator130of the water-cooled intercooler. Therefore, it is possible to enhance cooling efficiency of the water-cooled intercooler to the maximum by opening the first valve and closing the second valve, so that power and fuel economy performance of an engine can be enhanced.

In particular, the method of controlling the water-cooled intercooler system using the air conditioning system is performed by repeating the step S100of determining whether the indoor cooling is in the process of being carried out, the step S200of determining whether the further cooling is required and control step S300, S400or S500until key-off. Therefore, it is possible to continuously control the water-cooled intercooler system during key-on state, so that power and fuel economy performance of an engine can be enhanced.

As described above, according to an exemplary embodiment of the present invention, it is possible to enhance cooling efficiency of the water-cooled intercooler, so that power and fuel economy performance of an engine can be enhanced.

In addition, with a stable temperature of intake air provided in combustion chambers of an engine, it is possible to reduce knocking phenomenon of the engine.

Further, it is possible to reduce opening portion of a front bumper as the cooling efficiency of the intercooler is increased, so that fuel economy can be enhanced by reducing air resistance and the degree of freedom of design can be increased.