DE102007061495A1 - Explosion internal combustion engine for motor vehicle, has cooler arrangement including low temperature cooling circuit with air heat exchanger that cools compressed combustion air and condenser heat exchanger - Google Patents

Abstract

The engine (1) has a cooler arrangement (3) including a low temperature cooling circuit (33) with an air heat exchanger (39) via which a coolant (31) and combustion air (9) pass. The heat exchanger cools the compressed combustion air and a condenser heat exchanger (47) of a condenser (43) for an air-conditioning system (45) of a motor vehicle (5). The coolant passes through and cools the condenser heat exchanger. The cooling circuit operates independent of a low temperature level. The cooler arrangement has a high temperature cooling circuit for dissipating combustion heat.

Description

The The invention relates to an explosion-engine for a motor vehicle with a radiator assembly for cooling of the explosion combustion engine, a supercharger to the compressed Providing feedable from the explosion engine Combustion air, wherein the cooler assembly, a high-temperature cooling circuit and a low temperature cooling circuit. Furthermore, the Invention, a radiator assembly and a with the radiator assembly equipped motor vehicle.

For example, radiator assemblies for explosion-type internal combustion engines may have two heat exchangers, the heat exchangers being operable at different temperature levels. The heat exchangers can be cooled by means of a cooling air flow passing through the heat exchangers. It is known to turn this in series, ie to arrange one behind the other in the cooling air flow. The DE 199 281 93 A1 relates to an arrangement of at least two acted upon by ambient air heat exchangers, wherein a first of the at least two heat exchangers as a coolant radiator and a second of the at least two heat exchangers is designed as a charge air cooler and these two heat exchangers are arranged on the air side in series. The DE 102 004 043 471 A1 relates to a heat exchanger module, and a heat exchanger with a condenser for condensing a coolant and a heat exchanger for cooling a fluid other than the coolant. The DE 103 28 458 A1 shows a low-temperature radiator for a motor vehicle for cooling a plurality of components, wherein a heat sink is divided by partitions and / or passages into different segments for dividing a coolant flow, which are each connected to a coolant outlet such that separate and possibly different cooling outputs or cooling temperatures for the Cooling components are thereby realized. The EP 0 522 471 B1 shows a radiator assembly in a motor vehicle having at least a first and a second radiator, which are acted upon jointly by cooling air and of which at least the second radiator is divided. The DE 199 61 825 A1 relates to a cooling-heating circuit with two coolers and at least two partial circuits, which are fluidically coupled to each other.

task The invention is an improved cooling of aggregates to allow a motor vehicle.

The Task is with an explosion engine for a Motor vehicle with a cooler arrangement for cooling of the explosion combustion engine, a supercharger to the compressed Providing feedable from the explosion engine Combustion air, wherein the cooler assembly with a first cooling medium can flow through and on one first low temperature level independently operable Low temperature cooling circuit and one with a second cooling medium permeable, at a second higher temperature level operable and independent of the low temperature cooling circuit operable high-temperature cooling circuit for discharging of combustion heat of the explosion-type internal combustion engine, wherein the low temperature cooling circuit is one of the first Cooling medium and the combustion air can be flowed through first heat exchanger for cooling the compressed provided combustion air and one of the first cooling medium can be flowed through and thus coolable condenser of an air conditioning system of the motor vehicle has dissolved. Advantageously, the capacitor of the Air conditioning by means of the first cooling medium of the low-temperature cooling circuit be cooled. In the first cooling medium can it is for example a mixture of water and optionally act on other liquids. The condenser can be used for cooling be designed a refrigerant of the air conditioner. Advantageous can by means of the rapid heat transfer of the refrigerant of the air conditioner to the liquid Cooling medium, the condenser cooled particularly well become. The high temperature cooling circuit can also from a mixture of water and possibly other liquids than be flowed through the second cooling medium and over this Dissipate heat of combustion of the explosion-rate combustion engine. Advantageously, the low-temperature cooling circuit and the High temperature cooling circuit completely independent from each other, so not only on different Temperature levels are operated, but are beneficial too suitable, independently controllable and / or to set adjustable cooling capacities.

at a preferred embodiment of the explosion-combustion engine is provided that the low-temperature cooling circuit a be acted upon by a cooling air flow first air heat exchanger and the high-temperature cooling circuit with the cooling air flow having beaufschlagbaren second air heat exchanger. The Air heat exchangers can by means of a cooling air flow be cooled, each independently Heat transfer from the cooling media can be done on the air flow.

In a further preferred embodiment of the explosion combustion engine is provided that the first air heat exchanger seen in the flow direction of the cooling air flow is connected upstream of the second air heat exchanger. The first air heat exchanger can first with the cooling be subjected to air flow, which advantageously results in a lower temperature levels at the first air heat exchanger than at the downstream second air heat exchanger.

at a further preferred embodiment of the explosion-combustion engine is provided that the first air heat exchanger in the flow direction the cooling air flow seen the second air heat exchanger is connected in parallel. It can both air heat exchangers be charged with a not yet heated cooling air flow, wherein advantageously both the high-temperature cooling circuit as even the low-temperature cooling circuit completely independent are controllable from each other and / or regulated.

at a further preferred embodiment of the explosion-combustion engine is provided that the condenser in the flow direction of the first cooling medium to the first heat exchanger upstream, downstream or connected in parallel. Depending on Interconnection of the capacitor can this at a different temperature level Heat to the first cooling medium of the low-temperature cooling circuit submit.

at a further preferred embodiment of the explosion-combustion engine is provided that the first and / or second air heat exchanger a fan device for generating and / or supporting associated with the cooling air flow. By means of the fan device can the heat transfer from the cooling media be increased to the cooling air flow. The fan device For example, per heat exchanger a separate fan or alternatively, a single heat exchanger associated with individual fans exhibit.

at a further preferred embodiment of the explosion-combustion engine is provided that the performance of the fan device between 15 and 4 watts, preferably less than 15 watts, preferably less than 12 watts, preferably less than 10 watts, preferably less than 8 watts, preferably less than 5 watts, preferably less than 4 watts per Kilowatts of engine power of the explosion-rate combustion engine. Due to the good heat transfer of the low-temperature cycle, in particular for cooling the condenser of the air conditioning system, may be a fan request to increase the cooling capacity and / or the deliverable power of the fan device be lowered.

at a further preferred embodiment of the explosion-combustion engine is provided that the low-temperature cooling circuit a from the first cooling medium and an exhaust gas of the explosion-type internal combustion engine permeable exhaust gas recirculation heat exchanger for cooling the exhaust gas. Advantageously, in the Low-temperature cooling also cooling a Exhaust gas recirculation of the explosion-engine realized become. The recirculated exhaust gas of the explosion combustion engine the charge air can be added. Advantageously, by means of a good heat transfer from the gaseous Exhaust gas on the liquid first cooling medium of the low-temperature cooling circuit a particularly efficient cooling of the recirculated Exhaust gases take place. Advantageously, the exhaust gas recirculation heat exchanger, compared to an air exhaust heat exchanger significantly be designed smaller and space-saving.

at a further preferred embodiment of the explosion-combustion engine is provided that the low-temperature cooling circuit a independently operable by the high temperature cooling circuit Low-temperature coolant pump has. By a control and / or regulation of the low-temperature coolant pump may be a circulation of the first cooling medium of the low-temperature cooling circuit set separately from the high-temperature cooling circuit or be regulated, with an independent control and / or Control of the cooling capacity of the low-temperature cooling circuit is possible.

at a further preferred embodiment of the explosion-combustion engine is provided that the low-temperature coolant pump depending on a desired temperature at a flow of Capacitor off and / or a required cooling capacity controllable and / or controllable. Advantageously, the low-temperature cooling circuit on the requirements of an air conditioner connected to the condenser the motor vehicle are set, advantageously either via adjusting the flow temperature or a given cooling capacity, in particular of the capacitor. In the cooling capacity can it is the cooling capacity of the condenser or a Cooling capacity of other heat exchangers of the low-temperature cooling circuit or the entirety of all heat exchangers of the low-temperature cooling circuit act.

The Task is also with a cooler arrangement solved for a motor vehicle, wherein the cooler assembly as described above. The result is the previously described advantages.

The Task is further with a motor vehicle with an explosion-engine and / or a cooler arrangement, each designed as described above, solved. This results in the advantages described above.

Further advantages, features and details emerge from the following description, in which an embodiment is described in detail with reference to the drawing. The same, similar and / or functionally identical parts are provided with the same reference numerals.

It demonstrate:

1 a schematic view of an explosion-engine with a radiator assembly with a low-temperature cooling circuit;

2 another cooler assembly of an internal combustion engine with a low-temperature cooling circuit and a high-temperature cooling circuit; and

3 an advantageous arrangement of heat exchangers of a low-temperature cooling circuit and a high-temperature cooling circuit, for example, in 2 shown cooling circuits.

1 shows an explosion-engine 1 with a cooler arrangement 3 a motor vehicle 5 , The explosion engine 1 has a loader 7 for compressed delivery of the explosion-rate combustion engine 1 Supplyable combustion air 9 on. At the loader 7 it can be a mechanical or but as in 1 shown to be a turbocharger acting by means of an arrow 11 indicated combustion air flow of the combustion air and one by means of an arrow 13 indicated exhaust gas flow of an exhaust gas 15 associated with the combustion engine, wherein the exhaust gas stream extracted mechanical energy is used to compress the combustion air. The combustion air flow of the explosion combustion engine branches into a total of four combustion air ducts 17 for supplying the combustion air 9 to cylinders 19 the explosion-engine 1 , The cylinders 19 are exhaust ducts 21 as well as a single-flow exhaust system 23 downstream.

The exhaust system 23 shares with a branch 25 on, the exhaust gas flow of the exhaust gas 25 Direction of a downstream exhaust gas recirculation heat exchanger 27 and a downstream charge air heat exchanger 29 branched. A partial flow of the exhaust gas flow of the exhaust gas 15 can via the exhaust gas recirculation heat exchanger 27 the combustion air flow of the combustion air 9 to be led back. A remaining partial flow of the exhaust gas flow of the exhaust gas 15 can via the charge air heat exchanger 29 the loader 7 be supplied. The loader 7 is another part of the exhaust system 23 who in 1 is not shown in detail, downstream of an outlet opening in an environment of the motor vehicle 5 having.

The exhaust gas recirculation heat exchanger 27 as well as the charge air heat exchanger 29 are from a first cooling medium 31 a low temperature cooling circuit 33 the explosion-engine 1 flow through. A flow direction of the first cooling medium 31 is by means of an arrow 35 indicated. For driving the first cooling medium or for circulating the first cooling medium 31 indicates the low-temperature cooling circuit 33 a pump 37 on. At the pump 37 it may be advantageous to have a separate from a speed of the explosion combustion engine 1 operable pump, for example, to act an electrically operable pump.

The pump 37 is a first air heat exchanger 39 downstream. The first air heat exchanger 39 is from the first cooling medium 31 permeable, with this heat to one by means of an arrow 41 can deliver indicated cooling air flow. In the further course of the low-temperature cooling circuit 33 is the first air heat exchanger 39 the charge air heat exchanger 29 and this the exhaust gas recirculation heat exchanger 27 downstream. The exhaust gas recirculation heat exchanger 27 is the pump 37 downstream. The low temperature cooling circuit 33 is also for cooling a capacitor 43 an air conditioner 45 designed. The capacitor 43 the air conditioning 45 has a condenser heat exchanger 47 on top of a refrigerant 49 can be flowed through. A corresponding flow of the refrigerant is by means of an arrow 51 indicated. The refrigerant 49 can by means of the condenser heat exchanger 47 the air conditioning 45 Heat to the first cooling medium 31 of the low temperature cooling circuit 33 submit. This is the condenser heat exchanger 47 of the capacitor 43 between the first air heat exchanger 39 and the charge air heat exchanger 29 switched, so also from the first cooling medium 31 flow through. The air conditioner 45 has a compressor 53 for circulating the refrigerant 49 that the compressor 53 downstream condenser heat exchanger 47 , this downstream an expansion valve 55 and the expansion valve 55 downstream of an evaporator 57 on. The evaporator 57 turn is the compressor 53 downstream.

2 shows a schematic representation of a cooler arrangement 3 for an explosion-engine 1 with a low temperature cooling circuit 33 and a high temperature cooling circuit 59 , In the following, only the differences from the illustration according to 1 received. The low temperature cooling circuit 33 the cooler arrangement 3 the explosion-engine 1 has the charge air heat exchanger 29 , this downstream the condenser heat exchanger 47 the capacitor 43 This is followed by the first air heat exchanger 39 on. The first air heat exchanger 39 is the charge air heat exchanger 29 downstream.

Between the first air heat exchanger 39 and the charge air heat exchanger 29 is a branch 61 designed, which is a flow of the first cooling medium 31 in a surge tank 63 allows, by means of a valve 65 is controllable. The valve 65 may be an inflow of the first cooling medium 31 in the expansion tank 63 control and / or regulate or shut off. In addition, the valve can 61 a connection to the high-temperature cooling circuit 59 produce. The high temperature cooling circuit 59 is from a second cooling medium 67 flows through, wherein a flow direction of the second cooling medium 67 by means of an arrow 69 is indicated. When the valve is closed 65 are the high-temperature cooling circuit 59 and the low temperature cooling circuit 33 completely independently operable. Alternatively, it is conceivable on the branch 61 to dispense completely and for example per cooling circuit 33 and 59 a separate expansion tank 63 provided.

The high temperature cooling circuit 59 has a second air exchanger 71 and this downstream of a heat exchanger not shown within the explosion engine 1 for receiving combustion heat of the explosion-rate combustion engine 1 on. With respect to the cooling air flow, by means of the arrow 41 indicated, are the first air heat exchanger 39 and the second air heat exchanger 71 connected in series, the first air heat exchanger 39 of the low temperature cooling circuit 33 before the second air heat exchanger 71 of the high temperature cooling circuit 59 can be acted upon by the cooling air flow. It can be seen that the second air heat exchanger 71 is designed larger than the first air heat exchanger 39 and to a supernatant 73 has, which is also acted upon by a not yet heated part of the cooling air flow.

In alignment with the 2 Seen, the air heat exchangers 39 and 71 from bottom to top with the cooling media 31 and 67 flows through, so that in the supernatant 73 with the help of the fresh cooling air flow, a particularly low temperature of the second cooling medium 67 can result. For supporting and / or generating the cooling air flow is the heat exchangers 39 and 71 a fan device 75 with a fan 77 downstream.

3 shows a further arrangement possibility of the first air heat exchanger 39 and the second air heat exchanger 71 the cooling circuits 33 and 71 the cooler arrangement 3 the explosion-engine 1 , In the following, only the differences are discussed. It can be seen that the first air heat exchanger 39 in relation to the means of the arrow 41 indicated flow direction of the cooling air flow to the second air heat exchanger 71 is connected in parallel. Both heat exchangers 39 and 71 are the fan assembly 75 upstream, where it is conceivable, instead of the fan 77 two separate fans, one each of the heat exchangers 39 and 71 allocated to provide. Advantageously, both air heat exchangers 39 and 71 be charged with fresh, not yet heated cooling air of the cooling air flow. Advantageously results in a particularly short length of the overall arrangement of the air heat exchanger 39 and 71 by means of a double arrow 79 is indicated.

The capacitor must be advantageous 43 or the condenser heat exchanger 47 can not be cooled with air, which is comparatively small and space-saving interpretable. Advantageously, a frequent requirement of the fan 77 the fan assembly 75 be avoided. Advantageously, the condenser heat exchanger 47 of the capacitor 43 the air conditioning 45 in the low-temperature cooling circuit 33 to get integrated. Advantageously, an additional air cooler or air heat exchanger analogous to the air heat exchanger 39 and 71 not mandatory. Rather, only the first air heat exchanger 39 and the second air heat exchanger 71 for cooling the different units of the explosion combustion engine 1 and / or the motor vehicle 5 required. Advantageously, the condenser heat exchanger 47 between a return of the charge air heat exchanger 29 and a flow of the first air heat exchanger 39 be switched. Alternatively, it is conceivable, the condenser heat exchanger between a return of the first air heat exchanger 39 and a flow of the charge air heat exchanger 29 to switch. To save space, the first air heat exchanger 39 and the second air heat exchanger 71 be packed on top of each other ( 3 ).

A further advantage is that due to the good heat transfer water to air a lower requirement of Zuschaltens the fan 77 is possible. The fan 77 which is operable electrically, can advantageously be designed smaller, preferably less than 15 watts, preferably less than 11 watts, preferably less than 10 watts, preferably less than 8 watts, preferably less than 5 watts, preferably less than 4 watts per kilowatt of engine power of the explosion combustion engine 1 , This is also possible because due to the shorter overall length of a cooler package with the first air heat exchanger 39 and the second air heat exchanger 71 in a design of the explosion-engine 1 as a transverse engine a better outflow behind the cooler package is possible. In particular, when designing the explosion-type combustion engine as a diesel engine, it is possible to use the exhaust gas recirculation heat exchanger 27 also by means of the low-temperature cooling circuit 33 to cool.

1

Explosion engine

3

cooler arrangement

5

motor vehicle

7

loaders

9

combustion air

11

arrow

13

arrow

15

exhaust

17

Combustion air channels

19

cylinder

21

exhaust ducts

23

exhaust system

25

junction

27

EGR heat exchanger

29

Charge-air heat exchanger

31

first cooling medium

33

Low temperature cooling circuit

35

arrow

37

pump

39

Air heat exchanger

41

arrow

43

capacitor

45

air conditioning

47

Condenser heat exchanger

49

refrigerant

51

arrow

53

compressor

55

expansion valve

57

Evaporator

59

High-temperature cooling circuit

61

junction

63

surge tank

65

Valve

67

second cooling medium

69

arrow

71

air exchanger

73

Got over

75

fan device

77

Fan

79

double arrow

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19928193 A1 [0002]
• DE 102004043471 A1 [0002]
• - DE 10328458 A1 [0002]
• - EP 0522471 B1 [0002]
• - DE 19961825 A1 [0002]

Claims (12)

Explosion engine ( 1 ) for a motor vehicle ( 5 ) with - a cooler arrangement ( 3 ) for cooling the explosion-rate combustion engine ( 1 ), - a loader ( 7 ) for the compressed provision of the explosion engine ( 1 ) supplyable combustion air, wherein the cooler arrangement ( 3 ) - one with a first cooling medium ( 31 ) can be flowed through and at a first lower temperature level independently operable low-temperature cooling circuit ( 33 ) and - one with a second cooling medium ( 67 ) and can be operated at a second higher temperature level and by the low-temperature cooling circuit ( 33 ) independently operable high-temperature cooling circuit ( 59 ) for removing heat of combustion of the explosion-rate combustion engine ( 1 ), wherein the low-temperature cooling circuit ( 33 ) one of the first cooling medium ( 31 ) and the combustion air ( 9 ) throughflowable first air heat exchanger ( 39 ) for cooling the compressed combustion air ( 9 ) and one of the first cooling medium ( 31 ) can be flowed through and thus cooled condenser heat exchanger ( 47 ) of a capacitor ( 43 ) of an air conditioner ( 45 ) of the motor vehicle ( 5 ) having. Explosive combustion engine according to the preceding claim, characterized in that the low-temperature cooling circuit ( 33 ) can be acted upon by a cooling air flow first air heat exchanger ( 39 ) and the high-temperature cooling circuit ( 59 ) acted upon by the cooling air flow second air heat exchanger ( 71 ) having. Explosive combustion engine according to the preceding claim, characterized in that the first air heat exchanger ( 39 ), seen in the flow direction of the cooling air flow, the second air heat exchanger ( 71 ) is connected upstream. Explosion-combustion engine according to one of the preceding claims 2 or 3, characterized in that the first air heat exchanger ( 39 ), seen in the flow direction of the cooling air flow, the second air heat exchanger ( 71 ) is connected in parallel. Explosive combustion engine according to one of the preceding claims, characterized in that the condenser heat exchanger ( 47 ) of the capacitor ( 41 ) in the flow direction of the first cooling medium ( 31 ) the charge air heat exchanger ( 29 ) upstream, downstream or connected in parallel. Explosion-combustion engine according to one of the preceding claims 2 to 5, characterized in that the first and / or second air heat exchanger ( 39 . 71 ) a fan device ( 75 ) is assigned for generating and / or supporting the cooling air flow. Explosive combustion engine according to the preceding claim, characterized in that the fan device ( 75 ) an electrically operable fan ( 77 ), wherein a fan power of the fan ( 77 ) between 15 and 4 watts, preferably less than 15 watts, preferably less than 12 watts, preferably less than 10 watts, preferably less than 8 watts, preferably less than 5 watts, preferably less than 4 watts per kilowatt of engine power of the explosion-rate combustion engine ( 1 ) is. Explosion-combustion engine according to one of the preceding claims, characterized in that the low-temperature cooling circuit ( 33 ) one of the first cooling medium ( 31 ) and an exhaust gas of the explosion-rate combustion engine ( 1 ) through-flow exhaust gas recirculation heat exchanger ( 27 ) for cooling the exhaust gas ( 15 ) having. Explosion-combustion engine according to one of the preceding claims, characterized in that the low-temperature cooling circuit ( 33 ) one of the high-temperature cooling circuit ( 59 ) independently operable pump ( 37 ) for driving the first cooling medium ( 31 ) having. Explosive combustion engine according to the preceding claim, characterized in that the pump ( 37 ) depending on a desired temperature at a flow of the capacitor ( 43 ) and / or controllable by a required cooling capacity and or is controllable. Radiator arrangement ( 3 ) for a motor vehicle ( 5 ), formed according to one of the preceding claims. Motor vehicle ( 5 ) with an explosion engine ( 1 ) and / or a cooler arrangement ( 3 ), each formed according to one of the preceding claims.