KR20100047620A - Variable cooling integrated heat exchanger for hybrid vehicle - Google Patents

Abstract

PURPOSE: A variable cooling integrated heat exchanger for hybrid vehicle is provided to prevent thermal shock by keeping the uniform temperature of radiator. CONSTITUTION: A variable cooling integrated heat exchanger for hybrid vehicle comprises a radiator for an electronic unit(11), a radiator for an internal combustion engine(10) and an electrical field. The radiator for an internal combustion engine and the radiator for an electrical field are integrated into one heat exchanger shape. The inside of one of radiators is divided by a baffle(17). A cooling water inflow opening for an electric unit(14) and a cooling water inflow opening for an internal combustion engine(13) are installed in a head-space of the radiator tank divided with the baffle.

Description

Variable cooling integrated heat exchanger for hybrid vehicle

The present invention relates to a variable cooling integrated heat exchanger for a hybrid that integrates an electric field system cooling system and an internal combustion engine cooling system in a hybrid vehicle and performs variable cooling.

In general, a hybrid vehicle is a vehicle equipped with an engine and a motor to drive them simultaneously or selectively drive them to obtain driving force.

The hybrid vehicle is a device that is driven by a motor during constant speed driving and initial driving, and is operated by an internal combustion engine in a ramp driving or battery discharge mode to improve fuel efficiency.

In this case, the electric parts including the motor generate heat during operation, and in order to maintain the input / output characteristics of the parts in the best state, it is necessary to install a cooling device that suppresses the temperature rise of the parts.

In particular, in the case of a battery, in order to maintain the best overall charging and discharging efficiency, an appropriate temperature should be maintained.

Therefore, the heat generated by the charging and discharging of the battery is cooled by using a cooling device to maintain an appropriate temperature.

For example, in the case of a hybrid vehicle, the inverter generates heat due to a phase change of current (alternating to direct current) in the inverter and a heat generated by the operation of the motor and the generator. An electric field-type cooling system is provided in which a coolant is circulated through a municipal electric pump, an inverter, an inverter reservoir tank, and a radiator.

Therefore, the hybrid cooling system is operated by two cooling systems, an electric field system cooling system and an internal combustion engine cooling system, depending on the driving source.

Recently, an integrated cooling system that provides advantages of improved cooling efficiency, layout design advantages, reduced parts count and cost, that is, a cooling system integrating an electric field system cooling system and an internal combustion engine cooling system into one.

For example, Japanese Patent Application Laid-Open Nos. Hei 10-259721 and US Pat. No. 6,124,644 disclose a method in which an existing internal combustion engine radiator is divided into internal combustion engines and electric equipments.

However, when splitting the existing internal combustion engine radiator as described above, there is a disadvantage in cooling performance when applying a high-power hybrid vehicle due to lack of cooling heat dissipation capacity due to the size reduction.

In addition, electric radiators with a low commercial temperature (80 ° C) are cooled by heat exchange with an outside air temperature of 45 ° C, due to a lack of heat drop compared to radiators for internal combustion engines used at relatively high temperature (115 ° C). 35 ℃) Thermal efficiency is low, but it is difficult to increase the size of top, bottom, left and right due to integrated restrictions.

In addition, a radiator with different commercial temperatures (radiator for internal combustion engine (112 ° C) / electric radiator (80 ° C)) and operating conditions (simultaneous driving / stopping 1) are directly connected with a diaphragm in between, resulting in sudden train connection. There is a problem that the thermal shock caused by, resulting in fatigue failure.

Accordingly, the present invention has been made in view of the above-mentioned problems, and integrates the electric radiator for radiator and the radiator for internal combustion engine into one integrated structure, and cools the radiator by dividing or totally using the radiator according to the vehicle driving conditions in the integrated radiator. By implementing the concept of a cooling system, an object of the present invention is to provide a variable cooling integrated heat exchanger for a hybrid that can further improve the performance by further cooling the cooling water temperature to the electric field measurement without increasing the size of a separate radiator.

In order to achieve the above object, the hybrid variable cooling integrated heat exchanger provided by the present invention is combined with a radiator unit for an internal combustion engine and an electric radiator unit in the form of a heat exchanger, and is connected to both the radiator unit for an internal combustion engine and the radiator unit for an electric engine. One of the two radiator tanks being internally partitioned with baffles while the other is in communication with each other, while the interior space of the radiator tanks with internal baffle compartments is equipped with a coolant inlet for the internal combustion engine and a coolant inlet for the battlefield. The lower space side is characterized in that the electric coolant outlet for the electrical installation is installed, the radiator tank (12b) communicates with the internal combustion engine is installed in the cooling water outlet.

Therefore, the hybrid variable heat exchanger type heat exchanger of the present invention is primarily cooled in the internal combustion engine radiator and the full-length coolant in the radiator unit for the internal combustion engine when the internal combustion engine and the electric field are driven simultaneously, and a part of the first cooled cooling water is the internal combustion engine. At the same time, the rest may have a coolant flow that is secondarily cooled in the radiator part for the electric field and sent to the electric field system.In the case of driving the electric field, the entire length of the coolant side cooling water is first cooled in the radiator part for the internal combustion engine, It may have a coolant flow that is secondarily cooled in the radiator section and sent to the electrical system.

Hybrid variable cooling integrated heat exchanger provided by the present invention has the following advantages.

① Improvement of cooling performance-By radiating the radiator by dividing or using the radiator according to the driving conditions in one radiator, it is possible to improve the performance by additionally cooling the cooling water temperature to the electric field measurement without increasing the radiator size.

② Thermal shock prevention-It is possible to prevent thermal shock caused by the expansion and contraction of the structure by the sudden contact of the coolant with different working temperature in the separation structure.

For example, in the separate structures and cores of JP-A-10-259721 and US Pat. No. 6,124,644, the temperature of the radiator part is increased by driving only the electronic parts during the initial cold start, but the internal combustion engine part is the internal combustion engine during the initial cold start. In the non-driven subcooled state, a continuous thermal shock occurs in the separation structure and the core part due to the temperature difference.

In the structure of the present invention, the radiator may be divided or used depending on the vehicle driving conditions, and thus the thermal shock may be prevented by uniformly using the temperature of the radiator as a whole.

③ Improvement of bubble discharge function in the system-It is possible to remove bubbles collected in the cooling water.

For example, when the separation structure of Japanese Patent Application Laid-open No. Hei 10-259721 and US Pat. No. 6,124,64 are applied, fine bubbles generated by pressure drop due to core flow resistance when cooling water is injected or flow of cooling water from the core to the tank is applied. Is collected upward by the buoyancy and it is difficult to discharge to the lower drain at a small flow rate.

These bubbles act as a cooling water flow resistance, resulting in a decrease in cooling efficiency due to a decrease in cooling water circulation flow rate.

In the structure of the present invention, the radiator is divided or used in full according to the vehicle driving conditions, and the bubble is discharged by buoyancy to the upper side of the radiator unit for the internal combustion engine, so that the bubble can be smoothly discharged.

④ Cost reduction: By applying electric core system cooling core part and internal combustion engine cooling core part to one header and tank in one header and tank, respectively, cost can be saved and radiator can be divided or used whole By cooling, the cooling water temperature to the electric field measurement can be further cooled without increasing the size of the radiator, thereby reducing the cost.

⑤ Shorten process-One clinching process can be deleted, and two or more cores can be welded at a time.

⑥ Weight reduction and structure simplification-It is possible to reduce weight and simplify the structure by scrapping one tank and one header each than two heat exchangers.

※ The effects of ② and ③ above are not understood. Please be more specific .

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

1 is a schematic diagram illustrating a variable cooling integrated heat exchanger for a hybrid according to an embodiment of the present invention.

As shown in FIG. 1, in a hybrid cooling system employing two cooling systems of an electric field cooling system and an internal combustion engine cooling system, an integrated heat exchanger forms an electric radiator for an electric radiator and a radiator for an internal combustion engine as a single unitary structure. In addition to the basic cooling of the engine, the commercial temperature is low, and the large-capacity trend is in progress to effectively cool the electronics in progress.

To this end, the radiator part 10 for internal combustion engines and the radiator part 11 for electric fields are arranged side by side up and down and are tightened in the form of one heat exchanger, and the radiator part 10 for internal combustion engines and the radiator part 11 for electric appliances Radiator tanks 12a and 12b communicating with each radiator part side are respectively installed on both sides of the radiator tank. In particular, the radiator tanks 12a and 12b are respectively installed inside the radiator tank 12a installed at the cooling water inflow side of the two radiator tanks 12a and 12b. The baffle 17 is installed so that the tank internal space is partitioned up and down.

Accordingly, the inside of the radiator tank 12a is in communication with the radiator unit 10 side for the internal combustion engine upwards with respect to the baffle 17, and in the bottom with the radiator unit 11 side for the electric field, The inside of the radiator tank 12b communicates with both the radiator portion 10 for internal combustion engines and the radiator portion 11 for electric equipment.

For the inlet and outlet of the coolant, an internal combustion engine coolant inlet 13 and an electrical equipment coolant inlet 14 are installed on the upper space side of the radiator tank 12a in which the inside of the tank is divided by a baffle 17. On the side, an electric cooling water outlet 16 is provided.

In addition, the radiator tank 12b in which the inside of the tank communicates is provided with a cooling water discharge port 15 for an internal combustion engine.

Here, the position of each outlet can be determined according to the required heat generation amount of the electric appliance and the internal combustion engine.

These cooling water inlets and outlets can be used to configure two cooling circuits, an internal combustion engine system and an electric field system.

For example, the cooling circuit of the internal combustion engine system which leads to the cooling water outlet 15 of the internal combustion engine 15 → the engine water pump 20 → the internal combustion engine 21 → the cooling water inlet 13 of the internal combustion engine can be configured, and the cooling water for the electrical equipment The cooling system of the electric field system connected to the discharge port 16 → the electric water pump 22 → the inverter 23 → the reservoir tank 24 → the ISG 25 → the electric coolant inlet 14 for the electric field can be configured.

Here, in the case of the internal combustion engine cooling water inlet 13 and the electrical equipment cooling water inlet 14, it may be installed separately on the radiator tank 12a, or may be installed after being formed as one integral type.

At this time, when the cooling water inlet 13 for the internal combustion engine and the cooling water inlet 14 for the electric field are separately installed, the internal combustion engine side cooling water and the electric field side cooling water may be mixed inside the radiator tank 12a. In the case where the 13 and the electric coolant inlet 14 for the electric field are one, the internal combustion engine side cooling water and the electric coolant side cooling water may be mixed in advance and then introduced into the radiator tank 12a.

In addition, the radiator unit 10 and the electric radiator unit 11 for the internal combustion engine may be variably adjusted in volume with each other according to the required heat capacity.

For example, when the electric equipment of the electric system is large in capacity, the volume of the electric radiator unit 11 may be relatively larger than that of the radiator unit 10 for the internal combustion engine.

As another example, the radiator unit 10 for internal combustion engines and the radiator unit 11 for electric equipments may have different thicknesses of the core according to required heat capacity.

For example, when the electric equipment of the electric system is large in capacity, the thicknesses of the cores that enter the inside of the electric radiator unit 11 may be set to a size suitable for large-capacity heat exchange.

In FIG. 1, reference numeral 18 denotes a cap, and 19 denotes a header.

Therefore, the flow of the cooling water according to the operating conditions in the hybrid variable cooling integrated heat exchanger configured as described above is as follows.

Figure 2 is a schematic diagram showing the coolant flow when driving the electric field / internal combustion engine in a hybrid variable cooling integrated heat exchanger according to an embodiment of the present invention.

As shown in FIG. 2, the flow of the coolant during the simultaneous driving of the electric field and the engine under conditions where the speed of the vehicle exceeds 40 KPH or when driving on a climbing road is shown.

The relatively high temperature coolant returned from the engine water pump 20 and the electric water pump 22 of the internal combustion engine system and the electric field system is radiator tank 12a through the cooling water inlet 13 and the cooling water inlet 14 for the internal combustion engine. ), And the introduced cooling water is first cooled while passing through the radiator unit 10 for the internal combustion engine.

Subsequently, the first cooled cooling water is sent back to the internal combustion engine by the inflow amount through the cooling water discharge port 15 for the internal combustion engine in the radiator tank 12b, and the remaining cooling water is passed through the electric radiator part 11 to the secondary cooling. After it is discharged through the electric water pump 22 through the electric coolant outlet 16 for the electric field in the radiator tank 12a is discharged to the electric field system.

Here, the amount of cooling water flowing into the radiator and the amount of cooling water discharged by the radiator are the same by the continuous equation of hydrodynamics, and thus the amount of cooling water flowing from the internal combustion engine system and the electric field system can be sent to each system.

Figure 3 is a schematic diagram showing the coolant flow when driving the internal combustion engine in a variable cooling integrated heat exchanger for a hybrid according to an embodiment of the present invention.

As shown in FIG. 3, when the internal combustion engine is driven, the electric water pump 22 is not driven so that no cooling water flows in the cooling circuit of the electric system.

The high temperature coolant water received from the engine water pump 20 of the internal combustion engine system flows into the radiator tank 12a through the coolant inlet 13 of the internal combustion engine, and the coolant thus introduced passes through the radiator unit 10 for the internal combustion engine. The cooled and subsequently cooled cooling water is sent back to the internal combustion engine by the inflow amount through the cooling water discharge port 15 for the internal combustion engine in the radiator tank 12b.

Figure 4 is a schematic diagram showing the coolant flow during the full-length drive in the hybrid variable cooling integrated heat exchanger according to an embodiment of the present invention.

As shown in FIG. 4, the cooling water flow in the electric field driving is shown here under the condition that the speed of the vehicle is 40 KPH or less.

At this time, due to the non-driving of the engine water pump 20, there is no flow of cooling water in the cooling circuit of the internal combustion engine system, and the electric field-side cooling water can be cooled in the entire radiator.

For example, the relatively high temperature coolant flowed from the electric water pump 22 of the electric field system flows into the radiator tank 12a through the electric coolant inlet 14 for the electric field, and the cooling water thus introduced is the radiator unit 10 for the internal combustion engine. Primary cooling via).

Subsequently, the primary cooled coolant is secondarily cooled via the radiator tank 12b and directly via the electric radiator portion 11, and then through the electric coolant outlet 16 in the radiator tank 12a. Exhausted and sent to the battlefield system.

Therefore, the cooling performance can be greatly improved without increasing the size of the radiator separately when driving the electric field, which is the case where the heat dissipation amount of the electric radiator portion is most required.

As such, by cooling the radiator by dividing or using the radiator in accordance with the driving conditions of the vehicle, it is possible to greatly improve the cooling performance of the electric system.

1 is a schematic diagram showing a variable cooling integrated heat exchanger for a hybrid according to an embodiment of the present invention

Figure 2 is a schematic diagram showing the coolant flow when driving the electric field / internal combustion engine in a hybrid variable cooling integrated heat exchanger according to an embodiment of the present invention

Figure 3 is a schematic diagram showing the coolant flow when driving the internal combustion engine in a variable cooling integrated heat exchanger for a hybrid according to an embodiment of the present invention

Figure 4 is a schematic diagram showing the coolant flow during the full-length drive in the hybrid variable cooling integrated heat exchanger according to an embodiment of the present invention

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

10: radiator part for internal combustion engine 11: radiator part for electric equipment

12a, 12b: radiator tank 13: cooling water inlet for the internal combustion engine

14: Cooling water inlet for electric field 15: Cooling water outlet for internal combustion engine

16: electric cooling water outlet 17: baffle

18: Cap 19: Header

20: engine water pump 21: internal combustion engine

22: electric water pump 23: inverter

24: reservoir tank 25: ISG

Claims (6)

The radiator part 10 for internal combustion engines and the radiator part 11 for electric components are combined in the form of a heat exchanger, and two radiators connected to both the radiator part 10 and the electric radiator parts 11 for internal combustion engines are installed. One of the tanks 12a, 12b is internally partitioned by the baffle 17 while the other is in communication, and the internal combustion is directed to the upper space side of the radiator tank 12a in which the interior is partitioned by the baffle 17. The engine coolant inlet 13 and the electric coolant inlet 14 are installed at the same time, and the electric coolant outlet 16 is installed at the lower space side, and the radiator tank 12b having an internal communication therein is a coolant outlet 15 for the internal combustion engine. Hybrid variable cooling integrated heat exchanger, characterized in that consisting of) is installed structure. The internal combustion engine cooling water inlet 13 and the electric field cooling water inlet 14 are separately installed so that the internal combustion engine side cooling water and the electric field side cooling water may be mixed in the radiator tank 12a, respectively. A variable cooling integrated heat exchanger for a hybrid, characterized in that it is formed as one integral type before installation of the radiator tank (12a) so that the observation coolant and the electric field side cooling water are premixed and then introduced into the radiator tank (12a). 2. The hybrid cooling integrated heat exchanger of claim 1, wherein the radiator unit for the internal combustion engine and the radiator unit for the electric field are configured to variably adjust the volume of each other according to the required heat capacity. The hybrid heat exchanger of claim 1, wherein the radiator unit (10) and the radiator unit (11) for the internal combustion engine are set to have different thicknesses of the core according to the required heat capacity. The radiator unit 10 and the electric radiator unit 11 of the internal combustion engine are primarily cooled by the internal combustion engine-side coolant and the electric field-side coolant at the same time as the internal combustion engine radiator unit 10. , The hybrid cooling system heat exchanger for a hybrid, characterized in that a portion of the first cooled coolant is sent to the internal combustion engine while the rest has a second coolant flows from the electric radiator unit (11) to the electric field system. According to claim 1, The radiator part 10 for internal combustion engine and the radiator part 11 for electric field after the full length of the electric field side cooling water in the internal combustion engine radiator part 10 during the electric drive, electric radiator part 11 A variable cooling integrated heat exchanger for a hybrid, characterized in that it has a coolant flow that is second cooled from) to the electric field system.

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