DE102015016394A1 - Cooling arrangement for a charge air cooler and method for its operation - Google Patents

Abstract

The invention relates to a cooling arrangement (1) for an intercooler (3) of an internal combustion engine (2) of a motor vehicle, comprising a low-temperature cooling circuit (4) in which a coolant flows through a low-temperature radiator (5) and through the intercooler (3). wherein the low-temperature cooler (5) is located in an airflow (L) at least supported by a fan (7), wherein a refrigeration circuit (9) comprising a condenser (8), at least one expansion valve (10), an evaporator ( 11) and a compressor (12) and the evaporator (11) in the refrigerant circuit (9) connected in parallel, a further expansion valve (13) and a further evaporator (14) are provided, wherein the further evaporator (14) of the absorption of heat from the in the low-temperature cooling circuit (4) circulating coolant is used by evaporation of a refrigerant, wherein the further evaporator (14) in the low-temperature cooling circuit (4) downstream of the low-temperature radiator (5) and d em in the intercooler (3) is arranged upstream, wherein the condenser (8) in the air flow (L) is arranged parallel to the low-temperature radiator (5), in the refrigeration circuit (9) downstream of the compressor (12) and upstream of the condenser (8) at least another capacitor (15) is arranged.

Description

The invention relates to a cooling arrangement for a charge air cooler of an internal combustion engine of a motor vehicle and a method for operating the cooling arrangement.

Charged, especially supercharged, internal combustion engines are typically supplied with cooled intake air to increase efficiency.

From the DE 10 2014 018 729 A1 a cooling device for cooling an internal combustion engine with a charge air cooling is known, with at least one of a coolant for cooling the internal combustion engine and a lubricant for lubricating the internal combustion engine through which the heat exchanger, by means of which heat exchange between the coolant and the lubricant, the lubricant is temperature controlled, and with a heat exchanger associated with the valve, by means of which a quantity of the heat exchanger flowing through the coolant is adjustable, wherein at least one sensor is provided, by means of which at least one temperature of the lubricant can be detected, wherein the cooling device is adapted to the amount of the heat exchanger flowing through the coolant by means of the valve, depending on the detected by means of the sensor temperature of the lubricant.

The invention is based on the object to provide an improved cooling arrangement for a charge air cooler of an internal combustion engine of a motor vehicle and a method for operating the cooling arrangement.

The object is achieved by a cooling arrangement according to claim 1 and by a method for operating the cooling arrangement according to claim 6.

Advantageous embodiments of the invention are the subject of the dependent claims.

According to the invention, a cooling arrangement for an intercooler of an internal combustion engine of a motor vehicle comprises a low-temperature cooling circuit in which a coolant circulates through a low-temperature radiator and through the intercooler, wherein the low-temperature radiator is in an at least supported by a fan air flow. It is provided a refrigerant circuit, comprising a capacitor, at least one expansion valve, an evaporator and a compressor and the evaporator in the refrigerant circuit connected in parallel another expansion valve and another evaporator. The further evaporator is used to absorb heat from the circulating in the low-temperature cooling circuit coolant by evaporation of a refrigerant, the further evaporator in the low-temperature cooling circuit downstream of the low-temperature radiator and the charge air cooler is connected upstream, the condenser in the air flow parallel to the low-temperature radiator is arranged, wherein downstream of the compressor in the refrigeration circuit and upstream of the condenser at least one further capacitor is arranged.

By distributing the waste heat of the refrigerant circuit to two capacitors, namely the capacitor and the other capacitor, the heat input in the main cooler module is reduced. Because of the use of the further evaporator of the refrigerant circuit for the support of the intercooler, a much smaller low-temperature radiator can be used. Thus, the temperature of the coolant is reduced when entering the intercooler so far that very low charge air temperatures are possible. This results in an improved combustion in the internal combustion engine, in particular a reduction in the tendency to knock and a lower need for enrichment in full load operation. In part-load operation, a temperature of the charge air in a suction pipe below an outside air temperature, for example 35 ° C, can be achieved. Due to the parallel arrangement of the low-temperature radiator and the condenser in the air flow instead of the arrangement of the low-temperature radiator after the condenser is avoided that due to higher cooling capacity, the waste heat is parasitically introduced into the low-temperature cooling circuit.

Due to the additional use of the cooling circuit, the low-temperature radiator can be made correspondingly smaller. This is therefore cheaper, lighter, which saves weight and above all to arrange better and more universal in the engine compartment due to the smaller space requirements, as long as it can be supplied with primary air flow. Due to the smaller low-temperature radiator results in a lower air-side blockage in the radiator main module, which may include more coolers and capacitors. A lower blocking also allows a freer adaptation of other radiators and condensers of the main radiator module on the available space in the air flow of the front end of a vehicle so the overall cooling performance can also be improved and increased.

With the solution according to the invention can be achieved in supercharged, internal combustion engines, for example, a target temperature of about 60 ° C in the intake manifold at an outside air temperature of about 35 ° C in supercharged.

Embodiments of the invention are explained in more detail below with reference to drawings.

Showing:

1 a schematic view of a known in the prior art cooling arrangement for a charge air cooler of an internal combustion engine, and

2 a schematic view of a cooling arrangement for a charge air cooler of an internal combustion engine,

3 a schematic view of another embodiment of a cooling arrangement for a charge air cooler of an internal combustion engine.

Corresponding parts are provided in all figures with the same reference numerals.

1 shows a schematic view of a known in the prior art cooling arrangement 1 for a charge air cooler 3 an internal combustion engine 2 , The cooling arrangement 1 includes a low temperature refrigeration cycle 4 , in which a coolant circulates. That also in the internal combustion engine 2 heated coolant becomes a low temperature radiator 5 supplied and by means of the low-temperature radiator 5 flowing outside air cooled. Subsequently, the coolant enters the intercooler 3 for cooling charge air for combustion in the internal combustion engine 2 , Typically, the charge air is before passing through the intercooler 3 in a supercharger, for example a turbocharger, a compressor or an electric charger, which heats up. Cooling of the heated charge air in the intercooler 3 improves the combustion process in the internal combustion engine 2 , The low temperature cooler 5 is located for example near a front side of a motor vehicle, so that the airstream for supplying an air flow L of the outside air can be used. In addition, there is a fan 7 provided to amplify the air flow L and maintain even when the motor vehicle. The low temperature radiator 5 in the air stream L is a capacitor 8th arranged upstream, the part of a refrigeration circuit 9 is, for example, an air conditioning for air conditioning of the motor vehicle. One in the refrigerant circuit 9 circulating refrigerant passes after the condenser 8th at least one expansion valve 10 , an evaporator 11 and a compressor 12 before putting it in the condenser 8th is returned. In the air flow L behind the low-temperature radiator 5 For example, a high-temperature radiator (not shown) may be arranged. The cooling system with a high temperature cooler and a low temperature cooler 5 , especially in supercharged internal combustion engines 2 , is generally known and therefore not shown in detail.

2 shows a schematic view of a cooling arrangement according to the invention 1 for a charge air cooler 3 an internal combustion engine 2 , The cooling arrangement 1 includes a low temperature refrigeration cycle 4 , in which a coolant circulates. That also in the internal combustion engine 2 heated coolant becomes a low temperature radiator 5 supplied and by means of the low-temperature radiator 5 flowing outside air cooled. In the course of the coolant enters the intercooler 3 for cooling charge air for combustion in the internal combustion engine 2 , Typically, the charge air is before passing through the intercooler 3 in a supercharger, for example a turbocharger, a compressor or an electric charger, which heats up. Cooling of the heated charge air in the intercooler 3 improves the combustion process in the internal combustion engine 2 , The low temperature cooler 5 is located for example near a front side of a motor vehicle, so that the airstream for supplying an air flow L of the outside air can be used. In addition, there is a fan 7 provided to amplify the air flow L and maintain even when the motor vehicle. Parallel to the low temperature radiator 5 is in the air flow L a capacitor 8th arranged, the part of a refrigeration circuit 9 is, for example, an air conditioning for air conditioning of the motor vehicle. One in the refrigerant circuit 9 circulating refrigerant happens at least in the part following the condenser 8th at least one expansion valve 10 , an evaporator 11 and a compressor 12 before putting it in the condenser 8th is returned. The evaporator 11 For example, serves to absorb heat from the outside air by evaporation of the refrigerant. The thus cooled outside air is then used for example for cooling an interior of the vehicle. The evaporator 11 in the refrigeration circuit 9 connected in parallel are another expansion valve 13 and another evaporator 14 , a so-called chiller, which also with the low-temperature cooling circuit 4 is coupled and flows through the local coolant. The further evaporator 14 serves to absorb heat from the low-temperature cooling circuit 4 circulating coolant by evaporation of the refrigerant. In the low-temperature cooling circuit 4 is the other evaporator 14 the low temperature radiator 5 downstream and the intercooler 3 upstream. In the refrigerant circuit 9 is the compressor 12 downstream and the condenser 8th upstream another capacitor 15 arranged, for example in a wheel arch of the motor vehicle.

The other capacitor 15 can be arranged with or without a fan. The waiver a fan may be cheaper for flow reasons.

Im in 1 shown example from the prior art, a comparatively large low-temperature radiator 5 needed, since the charge air cooling exclusively by a temperature difference between the coolant when entering the intercooler 3 and the outside air depends. The arrangement of the capacitor 8th in the air stream L before the low-temperature radiator 5 obstructs the airflow L through the low-temperature radiator 5 and thus its cooling capacity.

Im in 2 embodiment shown is by distributing the waste heat of the refrigerant circuit 9 on two capacitors, namely the capacitor 8th and the other capacitor 15 reducing heat input in the radiator main module. Because of the use of the other evaporator 14 of the refrigeration circuit 9 for supporting the charge air cooling can be a much smaller low-temperature radiator 5 to be used as in 1 , This will change the temperature of the coolant entering the intercooler 3 reduced so far that very low charge air temperatures are possible. This results in improved combustion in the internal combustion engine 2 in particular a reduction in the tendency to knock and a lesser need for enrichment at full load. In partial load operation, a temperature of the charge air in a suction pipe below an outside air temperature T _AL , for example, 35 ° C, can be achieved. Due to the parallel arrangement of the low-temperature cooler 5 and the capacitor 8th in the air stream L instead of the arrangement of the low-temperature cooler 5 after the capacitor 8th is avoided that due to higher cooling capacity, the waste heat parasitic in the low-temperature cooling circuit 4 is introduced. In the air flow L behind the parallel arrangement of the low-temperature radiator 5 and the capacitor 8th For example, a high-temperature radiator (not shown) may be arranged. The air flow L through both the low temperature radiator 5 as well as through the capacitor 8th gets through the fan 7 supported and / or maintained. A forward facing surface of the low temperature radiator 5 may be equal to or different from that of the capacitor 8th be.

The other capacitor 15 can also be designed as a water-cooled condenser, so-called indirect condenser, connected to the low-temperature cooling circuit 4 can be connected. There are two heat transfers, from the refrigerant to the coolant and from the coolant to the outside air. The other capacitor 15 must not be arranged in the wheel arch in this case, but can be arranged in the vehicle at a suitable location, for example, inside. However, an arrangement in the wheel arch is possible. A blower for the other capacitor 15 can be omitted and thus the weight can be reduced. Eliminating the fan reduces noise (improved noise-vibration harshness).

In an embodiment, a regulation between a plurality of operating states may be provided.

At high speeds, the other capacitor 15 flows well through the airstream, so that this is the precooling of the refrigerant for the condenser 8th takes over. It can be a bypass 16 be provided with the other evaporator 14 in the low-temperature cooling circuit 4 can be bridged, so that a conventional low-temperature charge air cooling, bypassing the coupling to the refrigerant circuit 9 is possible.

If an increased intercooling is required or desired at high speeds, the bypass can 16 to be interrupted. In this way, the refrigerant circuit 9 with the low-temperature cooling circuit 4 coupled and so the low-temperature cooling circuit 4 supported. The refrigeration circuit 9 will, as in 2 represented by the further capacitor 15 and the capacitor 8th led and the refrigerant thus cooled. By coupling with the low-temperature cooling circuit 4 by means of the further evaporator 14 the coolant is cooled down further. Here, the capacitor carries 8th , because of the other capacitor 15 only part of the cooling capacity in the refrigerant circuit 9 provides only a small part of waste heat in the air flow L behind it high-temperature radiator (not shown) a.

3 shows a schematic view of another embodiment of a cooling arrangement 1 for a charge air cooler 3 an internal combustion engine 2 , The cooling arrangement 1 includes a low temperature refrigeration cycle 4 , in which a coolant circulates. That in the internal combustion engine 2 heated coolant becomes a low temperature radiator 5 supplied and by means of the low-temperature radiator 5 flowing outside air cooled. In the course of the coolant enters the intercooler 3 for cooling charge air for combustion in the internal combustion engine 2 , Typically, the charge air is before passing through the intercooler 3 in a supercharger, for example a turbocharger, a compressor or an electric charger, which heats up. Cooling of the heated charge air in the intercooler 3 improves the combustion process in the internal combustion engine 2 , The low temperature cooler 5 is located, for example, near a front side of a motor vehicle, so that the airstream used for supplying an air flow L of the outside air can be. In addition, there is a fan 7 provided to amplify the air flow L and maintain even when the motor vehicle. Parallel to the low temperature radiator 5 is in the air flow L a capacitor 8th arranged, the part of a refrigeration circuit 9 is, for example, an air conditioning for air conditioning of the motor vehicle. One in the refrigerant circuit 9 circulating refrigerant passes after the condenser 8th at least one expansion valve 10 , an evaporator 11 and a compressor 12 before putting it in the condenser 8th is returned. The evaporator 11 For example, serves to absorb heat from the outside air by evaporation of the refrigerant. The thus cooled outside air is then used for example for cooling an interior of the vehicle. The evaporator 11 in the refrigerant circuit 9 connected in parallel are another expansion valve 13 and another evaporator 14 , a so-called chiller. The further evaporator 14 serves to absorb heat from the low-temperature cooling circuit 4 circulating coolant by evaporation of the refrigerant. In the low-temperature cooling circuit 4 is the other evaporator 14 the low temperature radiator 5 downstream and the intercooler 3 upstream. In the refrigerant circuit 9 is the compressor 12 downstream and the condenser 8th upstream another capacitor 15 arranged, for example in a wheel arch of the motor vehicle.

The other capacitor 15 can be arranged with or without a fan. Dispensing with a blower can be cheaper for flow reasons.

In addition, a water-cooled condenser 17 , a so-called indirect capacitor, arranged in the refrigeration circuit 9 the other capacitor 15 is connected in parallel and the low-temperature cooling circuit 4 the other evaporator 14 is connected in parallel. With the water-cooled condenser 17 There are two heat transfers, from the refrigerant to the coolant and from the coolant to the outside air. The water-cooled condenser 17 must not be arranged in the wheel arch in this case, but can be arranged in the vehicle at a suitable location, for example, inside. A fan for the water-cooled condenser 17 can be omitted and thus the weight can be reduced.

At high speeds, the other capacitor 15 flows well through the airstream, so that this is the precooling of the refrigerant for the condenser 8th takes over. In the low-temperature cooling circuit 4 can be a bypass 16 be provided, which is both parallel to the other evaporator 14 as well as parallel to the water-cooled condenser 17 is arranged and with which the further evaporator 14 and the water-cooled condenser 17 in the low-temperature cooling circuit 4 can be bridged, so that a conventional low-temperature charge air cooling, bypassing the coupling to the refrigerant circuit 9 is possible. The water-cooled condenser 17 and the other evaporator 14 can fluidically in the refrigerant circuit 9 be disconnected or disconnected.

If an increased intercooling is required or desired at high speeds, the bypass can 16 to be interrupted. The further evaporator 14 can fluidically in the refrigerant circuit 9 be or be switched on. In this way, the refrigerant circuit 9 with the low-temperature cooling circuit 4 coupled and so the low-temperature cooling circuit 4 supported. The refrigeration circuit 9 will, as in 3 represented by the further capacitor 15 and the capacitor 8th led and the refrigerant thus cooled. By coupling with the low-temperature cooling circuit 4 by means of the further evaporator 14 the coolant is cooled down further. Here, the capacitor carries 8th , because of the other capacitor 15 only part of the cooling capacity in the refrigerant circuit 9 provides only a small part of waste heat in the air flow L behind it high-temperature radiator (not shown) a.

At low speeds, for example, at most 32 km / h, the pre-cooling of the refrigerant is not through the conventional other capacitor 15 carried out. This is instead turned off fluidically or separated. The further evaporator 14 can fluidically in the refrigerant circuit 9 be disconnected or disconnected. The water-cooled condenser 17 can fluidically in the refrigerant circuit 9 be switched on. In this way, the pre-cooling of the refrigerant by means of, for example, arranged internally, indirect water-cooled condenser 17 carried out over the low-temperature cooling circuit 4 is cooled. In this context, the parallel arrangement of the low-temperature radiator 5 and the capacitor 8th Particularly advantageous because in the conventional conventional series circuit, the additional cooling capacity by a then warmer low-temperature radiator 5 would not be possible.

LIST OF REFERENCE NUMBERS

1

cooling arrangement

2

Internal combustion engine

3

Intercooler

4

Low-temperature cooling circuit

5

Low-temperature cooler

7

Fan

8th

capacitor

9

cooling circuit

10

expansion valve

11

Evaporator

12

compressor

13

another expansion valve

14

another evaporator

15

another capacitor

16

bypass

17

water cooled condenser

L

airflow

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102014018729 A1 [0003]

Claims (7)

Cooling arrangement ( 1 ) for a charge air cooler ( 3 ) an internal combustion engine ( 2 ) of a motor vehicle, comprising a low-temperature cooling circuit ( 4 ), in which a coolant through a low-temperature radiator ( 5 ) and through the intercooler ( 3 ), wherein the low-temperature cooler ( 5 ) in one of a fan ( 7 ) at least supported air flow (L), characterized in that a refrigerant circuit ( 9 ) comprising a capacitor ( 8th ), at least one expansion valve ( 10 ), an evaporator ( 11 ) and a compressor ( 12 ) and the evaporator ( 11 ) in the refrigerant circuit ( 9 ) connected in parallel another expansion valve ( 13 ) and another evaporator ( 14 ) are provided, wherein the further evaporator ( 14 ) the absorption of heat from the low-temperature cooling circuit ( 4 ) circulating coolant by evaporation of a refrigerant, wherein the further evaporator ( 14 ) in the low-temperature cooling circuit ( 4 ) the low-temperature cooler ( 5 ) and the intercooler ( 3 ) is connected upstream, wherein the capacitor ( 8th ) in the air stream (L) parallel to the low-temperature cooler ( 5 ) is arranged, wherein in the refrigerant circuit ( 9 ) the compressor ( 12 ) and the capacitor ( 8th ) at least one further capacitor ( 15 ) is arranged. Cooling arrangement ( 1 ) according to claim 1, characterized in that the further capacitor ( 15 ) is arranged in a wheel arch of the motor vehicle. Cooling arrangement ( 1 ) according to one of claims 1 or 2, characterized in that the further capacitor ( 15 ) is designed as an indirect capacitor which is connected to the low-temperature cooling circuit ( 4 ) connected. Cooling arrangement ( 1 ) according to one of the preceding claims, characterized in that a water-cooled condenser ( 17 ) in the refrigerant circuit ( 9 ) the further capacitor ( 15 ) in parallel and in the low-temperature cooling circuit ( 4 ) the further evaporator ( 14 ) is arranged in parallel. Cooling arrangement ( 1 ) according to claim 4, characterized in that in the low-temperature cooling circuit ( 4 ) a bypass ( 16 ) for the optional bridging of the further evaporator ( 14 ) is provided. Method for operating a cooling arrangement ( 1 ) according to claim 5, characterized in that at high driving speed and normal power requirement of the bypass ( 16 ) is closed, at high speed and increased power requirement of the bypass ( 16 ) is opened. A method according to claim 6, characterized in that at low driving speed of the bypass ( 16 ) and the further capacitor ( 15 ) fluidically switched off and the refrigeration circuit ( 9 ) instead via the water-cooled condenser ( 17 ) to be led.

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