KR20080010646A - An auxiliary cooling and heating device for automobile using thermo element module and its controlling method thereof - Google Patents

Abstract

An auxiliary cooling and heating apparatus for an automobile using a thermo-element module and its controlling method are provided to perform appropriate control according to temperature of outlet ports of an auxiliary heat exchanger and a heater core to thereby minimize consumption of energy. An auxiliary cooling and heating apparatus for an automobile using a thermo-element module comprises the thermo-element module(101) performing endothermic reaction on one side thereof and exothermic reaction on the other side thereof according to a flow direction of electric current, an auxiliary heat exchanger(112) installed between an evaporator(15) and a heat core(16) in a air conditioner case(11) and exchanging heat with one side of the thermo-element module through a first circulating line(110) circulating cooling water through a first pump(111), and a heat exchanging means(125) installed outside the case and exchanging heat with the other side of the thermo-element module through a second circulating line(120) circulating cooling water through a second pump(121).

Description

An auxiliary cooling and heating device for automobile using thermo element module and its controlling method

1 is a block diagram showing a conventional auxiliary heating and cooling device,

Figure 2 is a block diagram showing a state in which the auxiliary air-conditioning device for cars using the thermoelectric module according to the present invention installed in the main air-conditioning device,

3 and 4 is a configuration diagram showing the flow of cooling water in the cooling and heating mode of the auxiliary heating and heating device for vehicles using the thermoelectric module according to the present invention,

5 is a block diagram showing a control method of an auxiliary heating and cooling device for a vehicle using a thermoelectric module according to the present invention.

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

100: auxiliary air conditioning unit 101: thermoelectric module

110: first circulation line 111: first pump

112: auxiliary heat exchanger

120: second circulation line 121: second pump

125: heat exchange means 126: first heat exchanger

126a: first shutoff valve 127: second heat exchanger

127a: second shut-off valve 127b: fan

131: first temperature sensor 132: second temperature sensor

The present invention relates to an auxiliary cooling device for a vehicle using a thermoelectric module and a method of controlling the same. More specifically, by combining an auxiliary cooling device using a thermoelectric module with an automotive main heating device, the cooling and heating performance is improved and the thermoelectric device is used. Auxiliary heating and cooling system for cars using thermoelectric module that minimizes energy consumption by appropriately controlling auxiliary air conditioning system according to outlet temperature of auxiliary heat exchanger and heater core by improving heat transfer efficiency by heat-exchanging both sides of module. And a control method thereof.

In recent years, engine efficiency has been improved due to the demand for improving fuel efficiency of automobiles. Accordingly, the amount of heat dissipated by engine cooling is reduced, so that heating heat sources using it are lacking in winter, and thus, a separate auxiliary heat source is required for the main heating system. It is true.

The main method currently used for such auxiliary heating is PTC electric heater, combustion heater, hot gas system using refrigerant system, heat pump system using refrigerant system.

The auxiliary heating device may have advantages and disadvantages of each, but the biggest problem is that only auxiliary heating can be performed and auxiliary cooling cannot be performed.

In particular, combustion or heat pump systems for applications requiring a large number of auxiliary heating sources are expensive, and PTC electric heaters for applications requiring a small amount of auxiliary heating sources are less expensive. Therefore, there is an urgent need for an auxiliary heating system capable of supplying a large amount of auxiliary heating heat sources with low cost.

As a technique for solving the above problems, Japanese Patent Laid-Open No. 1998-035268 discloses a Peltier element 3 (a thermoelectric element module) between a water-cooled heat exchanger 1 and an air-cooled heat exchanger 2, as shown in FIG. A heat exchange unit (4) mounted on the vehicle and a waste heat recovery unit (5) mounted on a vehicle, a radiator (6) with a fan connected in parallel with the waste heat recovery unit (5), and the waste heat recovery unit (5) or a fan attachment fan The first solenoid valve 7 and the second solenoid valve 8 and the first solenoid valve 7 and the second solenoid valve, which are connection replacement means for selectively connecting the heater 6 to the water-cooled heat exchanger 1, And controlling means for switching the applied voltage of the Peltier element at the same time as controlling the operation of 8).

Here, the air-cooled heat exchanger (2) is installed on the air conditioning duct side in the vehicle compartment to perform auxiliary cooling and heating.

However, the auxiliary air conditioner has a problem that the heat exchange efficiency is lowered and the heat exchange area is secured by using the air-cooled heat exchanger (2).

That is, the thermoelectric module has a characteristic in that the function of the other side also falls when one of the heat exchange efficiency of both sides where the temperature difference occurs drops. For example, when you want to heat the room, the heat dissipation side should have good heat dissipation and the heat absorption side should have good heat absorption using waste heat. If one side of the heat exchange efficiency drops, the temperature on the opposite side is conducted and the efficiency drops sharply.

In addition, the auxiliary cooling and heating device in the cooling mode or heating mode of the main air conditioning system is also controlled to continue cooling or heating operation, thereby causing a problem of increased energy consumption.

The object of the present invention for solving the above-mentioned problems is to improve the air-conditioning performance by combining the auxiliary air-conditioning unit using the thermoelectric module to the main heating device for automobiles and to improve the heat transfer efficiency by heat-exchanging both sides of the thermoelectric module in water In addition, the present invention provides an auxiliary cooling and heating device for a vehicle using a thermoelectric module that minimizes energy consumption by appropriately controlling the auxiliary heating and cooling device according to the exit temperature of the auxiliary heat exchanger and the heater core.

The present invention for achieving the above object is installed in the main air conditioner for the vehicle to perform the cooling and heating function by installing the evaporator and the heater core inside the air conditioning case and also when the air conditioning function of the main air conditioner lacks the auxiliary air conditioning function In the secondary cooling and heating apparatus for automobiles to improve the cooling and heating performance, the thermoelectric module having one endothermic action and the other side heat dissipation action according to the current flow direction, between the evaporator and the heater core in the air conditioning case And an auxiliary heat exchanger that performs an auxiliary cooling and heating function while water-cooling heat-exchanging with one side of the thermoelectric element module through a first circulation line for circulating cooling water by a first pump, and installed outside of the air conditioning case. The thermoelectric through a second circulation line for circulating the cooling water by 2 pump Including heat exchange means for heat exchange with a water-cooled and the other side of the chair module is characterized in that formed.

In addition, determining whether the main air conditioner is on or off state, and as a result of the determination of the step, the step of determining whether the cooling mode or heating mode in the on state, and as a result of the determination of the step, in the cooling mode, Measuring the outlet temperature of the auxiliary heat exchanger installed downstream of the evaporator of the air conditioning case with a first temperature sensor, and cooling the thermoelectric module when the outlet temperature of the auxiliary heat exchanger is higher than the target temperature of the user; and in the heating mode. And measuring the outlet temperature of the heater core installed downstream of the auxiliary heat exchanger of the air conditioning case with a second temperature sensor, and heating the thermoelectric module when the outlet temperature of the heater core is lower than the target temperature of the user. It is done.

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

Repeated description of the same construction and operation as in the prior art will be omitted.

Figure 2 is a block diagram showing a state in which the auxiliary heating and cooling device for cars using the thermoelectric module according to the present invention installed in the main air-conditioning device, Figure 3 and Figure 4 is an auxiliary heating and cooling device for cars using the thermoelectric module according to the present invention. This is a block diagram showing the flow of cooling water in the heating and cooling mode.

First, the air conditioner 11 for the vehicle main air conditioner 10, in which the auxiliary air conditioner 100 of the present invention is installed, is provided with an air inlet 12 at the inlet side and a plurality of air outlets 13 at the outlet side. ) Is provided.

Here, the air discharge port 13 is a defrost vent (13a) for discharging the air toward the windshield of the vehicle, a face vent (13b) for discharging the air toward the face of the occupant and for discharging the air toward the foot of the occupant It consists of the floor vent 13c. The vents 13a, 13b, and 13c are opened and closed by the mode door 14, and the opening degree thereof is adjusted.

The evaporator 15 and the heater core 16 are sequentially installed in the air conditioning case 11 at regular intervals, and the evaporator 15 passes through the evaporator 15 between the evaporator 15 and the heater core 16. Temperature control door 17 for adjusting the amount of mixing the cold and warmth through the heater core 16 is provided.

On the other hand, a blower 18 is installed at the inlet of the air conditioning case 11 to blow the inside or outside air into the air conditioning case 11.

In addition, the auxiliary heating and cooling device for a vehicle 100 using the thermoelectric module according to the present invention improves heating and cooling performance by performing an auxiliary cooling and heating function when the cooling and cooling function of the main heating and cooling device 10 is insufficient.

The auxiliary cooling and heating device 100, the thermoelectric element module 101 and the auxiliary heat exchanger 112 is installed to heat exchange through the first circulation line 110 on one side of the thermoelectric element module 101, and the On the other side of the thermoelectric module 101 is composed of a heat exchange means 125 installed to exchange heat through the second circulation line 120.

First, the thermoelectric module 101 has one endothermic effect and the other side dissipates according to the current flow direction. That is, the thermoelectric module 101 can perform both cooling and heating functions because the endothermic and heat dissipation can be performed at the same time through the pole (+,-) switching of the current.

In the cooling mode, the thermoelectric module 101 absorbs heat on one side of heat exchange with the first circulation line 110 and heat radiation on the other side of heat exchange with the second circulation line 120.

In the heating mode, the heat dissipation is performed at one side of heat exchange with the first circulation line 110, and the heat dissipation at the other side of heat exchange with the second circulation line 120.

In addition, the auxiliary heat exchanger 112 is installed on the downstream side of the evaporator 15 installed in the air conditioning case 11, and more preferably installed between the evaporator 15 and the heater core 16. Through the first circulation line 110 for circulating the cooling water by the first pump 111 to perform an auxiliary cooling and heating function while water-exchanging heat exchange with one side of the thermoelectric element module 101.

That is, in the heating mode, when the thermoelectric module 101 radiates heat to the first circulation line 110 side and the first circulation line 110 becomes the heating line, the auxiliary heat exchanger 112 heats up the heat. It's a spirit. Therefore, the coolant discharged from the first pump 111 receives heat from the thermoelectric module 101 and flows into the subsidiary heat exchanger 112 in a hot state at a high temperature.

In the cooling mode, when the thermoelectric module 101 is endothermic to the first circulation line 110 side and the first circulation line 110 becomes the cooling line, the auxiliary heat exchanger 112 is a cooling heat exchanger. do. Therefore, the cooling water discharged from the first pump 111 is deprived of heat from the thermoelectric element module 101 and flows into the auxiliary heat exchanger 112 in a cold state at a low temperature to cool the room.

As such, the auxiliary heat exchanger 112 is installed downstream of the evaporator 15 provided in the air conditioning case 11 of the main air conditioner 10 when the air conditioning function of the main air conditioner 10 is not sufficient ( Initially starting the vehicle) By further providing a heating and cooling source, it is possible to rapidly cool and heat the interior of the vehicle at the beginning of the vehicle to provide a comfortable indoor environment.

On the other hand, the auxiliary heat exchanger 112 is a general heat exchanger structure, the upper and lower tanks (not shown), and a plurality of tubes (not shown) installed between the upper and lower tanks and the heat dissipation fin interposed between the tubes. (Not shown).

In addition, the heat exchange means 125 is installed outside the air conditioning case 11 and the second element 121 of the thermoelectric element 101 through the second circulation line 120 for circulating the coolant by the second pump 121. It is made to exchange heat with the other side by water cooling.

The heat exchange means 125 connects the first shutoff valve 126a, the first heat exchanger 126, the second shutoff valve 127a, and the second heat exchanger 127 to the second circulation line 120. The cooling water passing through the second pump 121 is selectively passed through the first and second heat exchangers 126 and 127 in the cooling and heating mode.

That is, in the heating mode, the first shutoff valve 126a is opened and the second shutoff valve 127a is closed, so that the coolant circulated by the second pump 121 passes through the first heat exchanger 126. In the process of circulating the heat exchange with one side of the thermoelectric module 101,

In the cooling mode, the first shutoff valve 126a is closed and the second shutoff valve 127a is opened, whereby the coolant circulated by the second pump 121 circulates through the second heat exchanger 127. In the process it is to heat exchange with one side of the thermoelectric module 101.

As such, the first shut-off valve 126a and the second shut-off valve 127a are switching valves for cooling and heating, and when the waste heat recovery is necessary, the second shut-off valve 127a is closed so that the coolant is the first heat exchanger 126. The first shutoff valve 126a is closed to allow the coolant to flow to the second heat exchanger 127 when heat is to be discharged to the atmosphere.

Here, the first heat exchanger 126 is a heat exchanger for waste heat recovery, and is mounted on an exhaust pipe of the engine to exchange heat using waste heat of the engine.

In the case of a fuel cell vehicle, the first heat exchanger 126 may absorb heat from the fuel cell cooling circuit or the battery / motor cooling circuit. In the case of an engine vehicle, the first heat exchanger 126 may absorb heat from the engine cooling water. .

For reference, in the heating mode, the cycle is completed only when the second circulation line 120 continuously receives the heat necessary for endotherm from the thermoelectric module 101 through the first heat exchanger 126. 126) If the heat is not supplied due to the absence of the cycle, the cycle is not completed, and the temperature of the cooling water circulating in the second circulation line 120 is lowered to below zero due to the endothermic action of the thermoelectric module 101. will be. As such, in the heating mode, the heat absorbing side of the thermoelectric element module 101 should smoothly absorb heat using waste heat, and the heat dissipating side should smoothly dissipate heat, thereby improving the efficiency of the thermoelectric element module 101. In addition, the efficiency is improved to supply a large amount of heat required for the endotherm to the heat absorbing side of the thermoelectric element 101, and thus the heating temperature is increased.

The second heat exchanger 127 is configured as a radiator for cooling the second circulation line 120 using external air in the cooling mode. That is, in the cooling mode, the fan 127b installed at one side of the second heat exchanger 127 because heat is introduced into the second circulation line 120 due to the heat radiating action of the thermoelectric element module 101 to increase the temperature of the cooling water. By blowing outside air to cool the second circulation line 120 to improve the efficiency of the thermoelectric module 101.

Subsequently, a first temperature sensor 131 is installed downstream of the auxiliary heat exchanger 112, and a second temperature sensor 132 is installed downstream of the heater core 16.

That is, in the cooling mode of the main air conditioner 10, the outlet temperature of the auxiliary heat exchanger 112 is measured using the first temperature sensor 131, and at this time, the outlet temperature of the auxiliary heat exchanger 112 is the user's target. Only when the temperature is higher than the temperature, the thermoelectric module 101 is operated in the cooling mode,

In the heating mode of the main air conditioner 10, the outlet temperature of the heater core 16 is measured using the second temperature sensor 132, and the outlet temperature of the heater core 16 is lower than the target temperature of the user. Only to operate the thermoelectric module 101 in the heating mode.

As described above, in the cooling mode of the main air conditioner 10, it is preferable to operate the auxiliary cooling when the cooling function of the main air conditioner 10 is insufficient, such as in an idle or in the case of starting. As shown in FIG. 2, when auxiliary heating is insufficient, auxiliary heating is preferably stopped when cooling and heating are sufficient to minimize energy consumption.

Hereinafter, the operation of the auxiliary heating and heating device for a vehicle 100 using the thermoelectric module according to the present invention will be described.

end. In heating mode (Fig. 3),

The thermoelectric element 101 is heat dissipating to the first circulation line 110 side and endothermic to the second circulation line 120 side. At this time, the first shutoff valve 126a is opened and the second shutoff valve 127a is closed.

Accordingly, the coolant of the second circulation line 120 is discharged from the second pump 121 to pass through the first heat exchanger 126 and then heat exchanged with the thermoelectric module 101 to the second pump 121. It will cycle. In this process, the cooling water absorbs the waste heat of the engine while passing through the first heat exchanger 126 to become a high temperature state, and the absorbed heat is used as heat required for the endothermic action of the thermoelectric module 101.

The cooling water of the first circulation line 110 is discharged from the first pump 111 to exchange heat with the thermoelectric module 101, and then circulates to the first pump 111 via the auxiliary heat exchanger 112. In this process, the cooling water becomes a high temperature state by the thermoelectric module 101 having a heat radiating effect, and then flows into the auxiliary heat exchanger 112 to heat the room roll.

As such, in the heating mode, the first circulation line 110 becomes a heating line and the auxiliary heat exchanger 112 becomes a heating heat exchanger to improve the heating performance by performing auxiliary heating when the heating function of the main air conditioner 10 is insufficient. do.

I. In the cooling mode (Fig. 4),

The thermoelectric module 101 is endothermic to the first circulation line 110 side, and the heat dissipation action to the second circulation line 120 side. At this time, the first shutoff valve 126a is closed and the second shutoff valve 127a is opened.

Accordingly, the coolant of the second circulation line 120 is discharged from the second pump 121 to pass through the second heat exchanger 127 and then heat exchanged with the thermoelectric module 101 to the second pump 121. It will cycle. In this process, the coolant, which has become a high temperature state by the heat dissipation of the thermoelectric module 101, is radiated through the second heat exchanger 127. That is, the second heat exchanger 127 is formed by using external air. 2 to cool the circulation line (120).

The cooling water of the first circulation line 110 is discharged from the first pump 111 to exchange heat with the thermoelectric module 101, and then circulates to the first pump 111 via the auxiliary heat exchanger 112. In this process, the cooling water is cooled by the thermoelectric module 101 having an endothermic state, and then flows into the auxiliary heat exchanger 112 to cool the room.

In this way, in the cooling mode, the first circulation line 110 becomes a cooling line and the auxiliary heat exchanger 112 becomes a cooling heat exchanger to improve the cooling performance by performing auxiliary cooling when the cooling function of the main air conditioner 10 is insufficient. do.

FIG. 5 is a block diagram illustrating a control method of an auxiliary heating and cooling device for a vehicle using a thermoelectric module according to the present invention, and descriptions of the overlapping parts will be omitted.

The control method of the auxiliary air conditioning unit,

First, it is determined whether the main air conditioner 10 is in an on state or an off state (S1). If off, feedback.

As a result of the determination in step S1, when it is determined that the main air conditioner 10 is in the on state, it is determined whether the main air conditioner 10 is in the cooling mode or the heating mode (S2).

As a result of the determination in step S2, when it is determined that the main cooling device 10 is in the cooling mode, the thermoelectric module (secondary cooling device) is selectively cooled and operated (S3).

That is, when it is determined that the main air conditioner 10 is in the cooling mode, the outlet temperature of the auxiliary heat exchanger 112 installed downstream of the evaporator 15 of the air conditioning case 11 is measured by the first temperature sensor 131. (S3-1).

Thereafter, the outlet temperature of the auxiliary heat exchanger 112 is compared with the target temperature of the user (S3-2).

Here, when it is determined that the outlet temperature of the subsidiary heat exchanger 112 is higher than the target temperature of the user, the thermoelectric module (subsidiary cooling and heating device) is cooled and operated (S3-3), and the subsidiary heat exchanger 112 is performed. If it is determined that the outlet temperature of the user is lower than the target temperature of the user, the operation of the thermoelectric module (auxiliary heating device) is stopped (S3-4).

On the other hand, when the determination result of the step (S2), it is determined that the main heating device 10 is in the heating mode, and selectively heating the thermoelectric element module (secondary heating and cooling device) (S4).

That is, when it is determined that the main air conditioner 10 is in the heating mode, the outlet temperature of the heater core 16 installed downstream of the auxiliary heat exchanger 112 of the air conditioning case 11 is measured by the second temperature sensor 132. (S4-1).

Thereafter, the outlet temperature of the heater core 16 is compared with the target temperature of the user (S4-2).

Here, when it is determined that the outlet temperature of the heater core 16 is lower than the target temperature of the user, the thermoelectric module (auxiliary heating and cooling unit) is heated and operated (S4-3), and the outlet of the heater core 16 is heated. If it is determined that the temperature is higher than the target temperature of the user, the operation of the thermoelectric module (auxiliary heating device) is stopped (S4-4).

According to the present invention described above, by combining the auxiliary heating and cooling device using the thermoelectric module with the main heating device for automobiles to perform the auxiliary heating and cooling function when the initial heating or lacking the heating and cooling function of the main air conditioning system during the idle time is improved by heating and cooling performance .

In addition, by utilizing the thermoelectric module, it is possible to implement auxiliary cooling and heating with a simple structure, and the heat transfer efficiency is improved by heat-exchanging both sides of the thermoelectric module.

Then, the first and second temperature sensors are respectively installed downstream of the auxiliary heat exchanger and the heater core to selectively select the auxiliary air conditioning unit (thermoelectric module) according to the outlet temperature of the auxiliary heat exchanger or the heater core in the cooling / heating mode of the main heating unit. Running minimizes energy consumption.

In addition, by enabling the heating and cooling with one auxiliary heat exchanger, it is possible to configure a simple heat pump system and to reduce the number of parts.

Claims (6)

Installed in the main air conditioner 10 for the vehicle to perform the cooling and heating function by installing the evaporator 15 and the heater core 16 inside the air conditioning case 11 and the air conditioning function of the main air conditioning device 10 may be insufficient. In the auxiliary cooling and heating device for cars to improve the heating and cooling performance by performing the auxiliary cooling and heating function, A thermoelectric module 101 having one endothermic and the other side dissipating according to a current flow direction; The thermoelectric element module 101 is installed between the evaporator 15 and the heater core 16 in the air conditioning case 11 and through the first circulation line 110 circulating the coolant by the first pump 111. Auxiliary heat exchanger (112) performing an auxiliary cooling and heating function while water-cooled with one side of the), Heat exchange means which is installed outside the air conditioning case 11 and heat-exchanged with the other side of the thermoelectric element module 101 through the second circulation line 120 for circulating the coolant by the second pump 121 ( Automotive auxiliary heating and heating device using a thermoelectric module, characterized in that comprises a 125). The method of claim 1, The heat exchange means 125 parallels the first shutoff valve 126a and the first heat exchanger 126 and the second shutoff valve 127a and the second heat exchanger 127 to the second circulation line 120. Cooling water passing through the second pump 121 in the cooling, heating mode is selectively installed to pass through the first and second heat exchangers 126, 127, using a thermoelectric module, characterized in that Automotive Air Conditioning System. The method of claim 1, A first temperature sensor 131 is installed downstream of the subsidiary heat exchanger 112 and cools the thermoelectric module 101 when the outlet temperature of the subsidiary heat exchanger 112 is higher than a target temperature of the user in the cooling mode. Mode, A second temperature sensor 132 is installed downstream of the heater core 16, and when the outlet temperature of the heater core 16 is lower than the target temperature of the user in the heating mode, the thermoelectric module 101 is heated. Automotive auxiliary heating and cooling device using a thermoelectric module, characterized in that operating in. The method of claim 2, The first heat exchanger 126 is composed of a heat exchanger for heat recovery using the waste heat of the engine, The second heat exchanger (127) is an auxiliary heating and heating device for a vehicle using a thermoelectric module, characterized in that configured in the cooling mode the second circulation line (120) to cool using external air. Determining whether the main heating device 10 is on or off (S1), As a result of the determination of the step (S1), the step of determining whether the cooling mode or heating mode in the on state (S2), As a result of the determination in step S2, in the cooling mode, the outlet temperature of the auxiliary heat exchanger 112 installed downstream of the evaporator 15 of the air conditioning case 11 is measured by the first temperature sensor 131, and the auxiliary heat exchange is performed. Cooling the thermoelectric module 101 when the outlet temperature of the gas 112 is higher than a target temperature of the user (S3); In the heating mode, the outlet temperature of the heater core 16 installed downstream of the auxiliary heat exchanger 112 of the air conditioning case 11 is measured by the second temperature sensor 132, so that the outlet temperature of the heater core 16 is a user. When the temperature is lower than the target temperature control method of the auxiliary heating and heating device for a vehicle using a thermoelectric module comprising the step of heating the thermoelectric module (101) (S4). The method of claim 5, wherein In the cooling mode, when the outlet temperature of the auxiliary heat exchanger 112 is lower than the target temperature of the user, the thermoelectric module 101 stops operation. In the heating mode, when the outlet temperature of the heater core 16 is higher than the user's target temperature, the thermoelectric module 101 stops operation. .

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