EP2317094A2 - Circuit assembly - Google Patents

Abstract

The circulation arrangement (1) has a heat exchanger and a storage unit (8), where the heat exchanger cools an engine block (12) by a coolant circuit (2). The storage unit is provided for the heat in another coolant circuit (3). The heat is to be delivered to a heating unit (11). The storage unit is integrated in a third coolant circuit (4) for additional cooling of the engine block. The heat exchanger is a coolant cooler, particularly high-temperature coolant cooler.

Description

The invention relates to a circuit arrangement for a motor vehicle having a motor vehicle according to the preamble of claim 1.

In order to cool an internal combustion engine by means of a cooling liquid, which consists, for example, of a mixture of water and antifreeze, at least one heat exchanger in the form of a coolant cooler is arranged in a coolant circuit according to the prior art. Coolant flowing through the coolant is cooled by wind and pumped by a pump into the engine and cylinder head to be cooled. By circulating the coolant through the engine, its temperature is lowered.

In certain situations, it is desirable that an internal combustion engine can be cooled down particularly quickly. For example, a Kattwasserlcühlung could contribute greatly to improving the combustion processes, especially in high load operation.

However, such an effective and very fast cooling is not possible by means of the configurations known in the prior art, since this is only the coolant radiator serves as a cold water storage, and this is not sufficient reservoir for the purposes mentioned above.

Therefore, it is the object of the present invention to provide a Kreistaufanordnung for an internal combustion engine having a motor vehicle, by means of which the high-load capability of an engine is improved,

The object of the present invention is achieved by a circuit arrangement having the features according to claim 1. Advantageous developments of the present invention are defined in the subclaims.

According to the invention, a circuit arrangement is provided for a motor vehicle having an internal combustion engine in which a coolant is circulated, wherein in the Kreislaufancardnung at least a first heat exchanger, which cools an engine block via a first Kühlmiftelkreislauf, and at least one storage device for heat to be discharged to a heater in a second Coolant circuit are arranged, wherein the storage device is integrated in a third coolant circuit for additional cooling of the engine block. Due to the configuration according to the invention not only the first heat exchanger is used as a cold water storage, but it can be provided via the third Kohlmittelkreislauf additional cooling, the storage device also serves as a cold water storage tank in this case. By incorporating the storage device into the third coolant circuit, cold water can thus be quickly fed into the engine block and / or the cylinder head via the third coolant circuit in order to cool it effectively and rapidly. This is particularly advantageous in high-load operation of the internal combustion engine, since this improves the high-load capability of the engine. Furthermore, this configuration according to the invention is also very advantageous if the motor vehicle has a shutter located in front of the coolant radiator. Radiator shutters are used, for example, at low Outside temperatures or, if the engine has not yet reached its final operating temperature, to compensate for the effect of the radiator. The use of Ktthlerjalousien is advantageous for improving the aerodynamics and thus to reduce fuel consumption. However, by inserting the radiator shutter or closing it to achieve the above-enumerated effects, the cooling performance of the coolant radiator is deteriorated because there is no longer sufficient airflow for cooling the coolant flowing through the radiator. Therefore, an additional cold water storage for cooling the engine block, which is achieved by the use of the storage device or their integration into the third refrigerant circuit is particularly advantageous in this case. The configuration according to the invention advantageously makes it possible to realize a prolonged transit time in the operation of blinds. In addition, a reduction in the thermal cycling of the coal cooler is achieved by the circuit arrangement according to the invention.

According to a preferred embodiment, the first heat exchanger is a coolant radiator, in particular a high-temperature coolant radiator.

According to yet another preferred embodiment, a conduit of the third coolant cycle into a first inlet of a first valve and a conduit of the second coolant circuit into a second inlet of the first valve, via which the supply of the coolant from the second coolant circuit and the supply of the coolant from the third Kühlmittelkreisiauf is controllable to the storage device. As a result, a good loading of the storage device via the respective coolant circuits can be realized.

According to yet another preferred embodiment, the first valve is an electrically, magnetically or electromagnetically actuatable valve, wherein the first valve preferably has a switching time of less than 2 s. By twisting the fast electrically or electromagnetically actuated valves, it is possible to quickly open the radiator path and thus use the coolant contained in the radiator for rapid engine cooling down.

Preferably, a first pump is arranged between the first valve and the storage device.

It is also preferred if, by switching the valve, the function of the storage device as a heat storage and cold storage is changeable.

According to a further preferred embodiment, the storage device has an output which is ver connected to the heating device and a cylinder head of the Srenrtkraftmaschme via the second coolant circuit.

According to yet another preferred embodiment, the output of the storage device is connected to the engine block via the third cooling circuit.

Preferably, the output of the storage device is connected to an inlet of a second valve.

According to yet another preferred embodiment, the second valve has a first outlet and a second outlet.

Moreover, it is particularly preferred if the first outlet of the second valve directs the coolant into the third coolant circuit to the engine block, and the second outlet of the second valve, the coolant in the zweten coolant circuit to the heater and / or the cylinder head passes. Preferably, the coolant coming from the storage device via the third coolant circuit, when the storage device acts as a cold storage, can be fed into the engine block via a pump intake side. Alternatively, an intake in the region of the exhaust gas cooler, an intake in the region of the turbocharger, an intake in the region of the engine oil cooler or in the region of the transmission oil cooler can be implemented.

According to a further preferred embodiment, a second heat exchanger, in particular a low-temperature cooler, is provided in the circuit arrangement. In this case, the storage device is charged with coming from the low-temperature cooler cold coolant, the high-temperature coolant radiator cools the engine block via the first Kühlmitteikreislauf.

Preferably, the first heat exchanger is integrated into the first coolant circuit and the third coolant circuit.

Alternatively, the first heat exchanger may be integrated in the first coolant circuit and the second heat exchanger in the third coolant circuit.

According to yet another preferred embodiment, the storage device is integrated in a refrigerant circuit of an automotive air conditioning system.

Preferably, moreover, a capacitor can be integrated into the memory device.

Fig 1

eine Kreisiaufanordnung gemäß einer Ausführungsform,

Fig. 2

eine weitere Kreislaufanordnung gemäß einer Ausführungsformj

Fig. 3

eine weitere Kreislaufanordnung gemäß einer Ausführungsform;

Fig. 4

eine weitere Kreislaufanordnung gemäß einer Ausführungsform.

fig. 1 zeigt eine Kreislaufianordnung 1 gemäß einer Ausführungsform mit einem ersten Kühlmittelkreislauf 2, welcher durch eine gepunktete Linie schematisch angedeutet ist, einem zweiten Kühlmittelkreislauf 3, welcher durch eine strichpunktierte Linie schematisch angedeutet ist, und einen dritten Kühlmittelkreislauf 4, welcher durch eine gestrichelte Linie schematisch angedeutet ist. In der Kreislaufanordnung 1 sind darüber hinaus ein erster Wärmetauscher 5, welcher als Hochtemperatur-Kühlmittelkühler ausgebildet ist, ein erstes Ventil 6, welches ein elektromagnetisch betätigtes Ventils mit einer Schaltzeit < 2 s ist, eine erste Pumpe 7, eine Speichereinrichtung 8, eine zweite Pumpe 9, ein Thermostat 10, eine Heizeinrichtung 11, ein MotorblociC 12 und ein Zylinderkopf 13 angeordnet. Auch ist hier ein zweiter Wärmetauscher 14 vorgesehen, welcher als Niedertemperatur-Kühlmittelkühler ausgebildet ist, welcher jedoch nicht in den ersten, zweiten oder dritten Kuhimitteikreistauf 2. 3 oder 4 integriert ist.In the following the invention will be explained in detail by means of an embodiment with reference to the drawing. In the drawing show

Fig. 1

a circuit arrangement according to an embodiment,

Fig. 2

another circuit arrangement according to an embodiment of the invention

Fig. 3

another circuit arrangement according to an embodiment;

Fig. 4

another circuit arrangement according to an embodiment.

fig. 1 shows a Kreislaufianordnung 1 according to one embodiment with a first coolant circuit 2, which is indicated schematically by a dotted line, a second coolant circuit 3, which is indicated by a dotted line schematically, and a third coolant circuit 4, which is indicated schematically by a dashed line , In the circuit arrangement 1, moreover, a first heat exchanger 5, which is designed as a high-temperature coolant radiator, a first valve 6, which is an electromagnetically operated valve with a switching time <2 s, a first pump 7, a memory device 8, a second pump 9, a thermostat 10, a heater 11, a MotorblociC 12 and a cylinder head 13 are arranged. Also here is a second heat exchanger 14 is provided, which is designed as a low-temperature coolant radiator, which, however, is not integrated into the first, second or third Kuhimitteikreistauf 2. 3 or 4.

In the first coolant circuit 2, a coolant consisting of a mixture of water and antifreeze circulates through the first heat exchanger 5, in which the coolant is cooled by wind during driving of the motor vehicle, via the thermostat 10 and the second pump 9 to the engine block 12 and the cylinder head 13, of which the heated by the engine block 12 and the cylinder head 13 then coolant is passed back to the first heat exchanger 5, where it is in turn cooled by the airstream. Thus, by means of this first Kühimitteikreislaufs 2, the temperature of the engine block 12 and the cylinder head 13 is controlled or cooled.

In the second coolant circuit 3, the coolant circulates from the engine block 12 and the cylinder head 13 via the first valve 6 and the first pump 7 to the storage device 8, which may serve as a heat accumulator or heat accumulator, around the engine block 12 and the cylinder head 13 To store coolant and, if necessary, to a heater 11 for heating a passenger compartment of the motor vehicle.

In the third refrigerant circuit 4, a coolant circulates from the first heat exchanger 5 via the first valve 6 and the first pump 7 to the storage device 8, which can also serve as a cold storage according to the control of the first valve 6, which will be described later in order to deliver the cooled by the first heat exchanger 5 coolant as needed via the second pump 9 to the engine block 12 and the cylinder head 13 for additional cooling.

The first valve 6 has a first inlet 15, which is connected to a line 17 coming from the first heat exchanger 5, and a second inlet 16, which is connected to a line 18 coming from the engine block 12 and cylinder head 13. If the function of the storage device 8 is required as a heat storage, the first valve 6 switches to close the first inlet 15 and the second inlet 16 to open, so that through an outlet 19 of the first valve 6 via the pump 7, hot coolant in the Storage device 8 is initiated to be stored there and delivered to the heater 11. However, if the function of the memory device 8 as a cold storage required is, then the valve 6 switches to open the first inlet 15 and the second inlet 16 to close, so that through the outlet 19 of the first valve 6 via the pump 7 cold coolant the Speicheinnachtung 8 is supplied to stored there and on the engine block 12 and the cylinder head 13 to be discharged, which causes additional cooling of the engine block 12 and the cylinder head 13 to the cooling caused by the first coolant circuit. Thus, according to this embodiment, for example, at a content of the storage device 8 of 3 liters of coolant, a previous storage charge with 40 ° C warm coolant and a coolant temperature in the engine of 100 ° C with an additional supply of coolant in the manner described above within 2 s a short-term power of 1500 g / s * 3.5 J / g / K * 60K = 300 kW can be achieved.

Fig. 2 shows a further circuit arrangement 1 according to an embodiment, which differs from the in Fig. 1 in that a further, second valve 20 is arranged downstream of the storage device 8, which has an inlet 21 which is connected to an outlet 22 of the storage device 8 and which has a first outlet 23 and a second outlet 24 via which respectively the supply of cold or warm coolant is adjustable. At this time, when the second valve 20 is controlled to close the first outlet 23 and open the second outlet 24, hot coolant is supplied to the heater 11 via the second refrigerant circuit 3 and, when the second valve 20 is controlled, to opening the first outlet 23 and closing the second outlet 24, cold coolant is directed to the engine block 12 and the cylinder head 13 via the third coolant circuit 4. In addition, in this embodiment, a check valve 25 is provided.

Fig. 3 shows yet another circuit arrangement 1 according to an embodiment, which differs from the in Fig. 2 shown embodiment in that the third coolant circuit 4 is not passed through the first heat exchanger 5 to the first valve 6 and to the first inlet 15 of the first valve 6, but via the second heat exchanger 14, which upstream with the engine block 12 and Cylinder head 13 is connected. Thus, according to the embodiment shown here, the second heat exchanger 14 of the storage device 8 supplies the cooled coolant. In addition, this embodiment also differs from the one in FIG Fig. 2 illustrated embodiment in that the coming of the second outlet 24 with appropriate control of the first valve 6 and the second valve 20 heated cooling water is not supplied directly to the heater, but here any user 26 is interposed, such as an exhaust heat user, an automatic transmission cooling , engine oil cooling, indirect condenser cooling, etc.

Finally, in Fig. 4 a further circuit arrangement 1 according to an embodiment, which differs from the in Fig. 3 illustrated embodiment, characterized in that a refrigerant circuit 27 of an automotive air conditioning system, which here schematically by a compressor 28, a third valve 29, a first capacitor 30, a fourth valve 31, which is designed as an expansion valve, and an evaporator 32 is shown. In this case, the third valve 29 regulates the supply of the refrigerant to the fourth valve 31 via the first capacitor 30 arranged in the refrigerant circuit 27 or via a bypass 33, which conducts the refrigerant through the storage device 8 of the circuit arrangement 1. In the storage device 8 here a second condenser 34 is provided, through which the refrigerant of the motor vehicle air conditioner is passed, to then be supplied to the expansion valve or the fourth valve 31. As can be further seen, is in this embodiment also a radiator shutter 35, which acts as already described, arranged in front of the first heat exchanger 5 and the second heat exchanger 14.

Overall, the circuit arrangement 1 described above ensures effective and rapid cooling of the engine block in certain situations, for example during high-load operation.

LIST OF REFERENCE NUMBERS

1

Circuit arrangement

2

first coolant run

3

second coolant circuit

4

third coolant circuit

5

first heat exchanges

6

first valve

7

first pump

8th

memory device

9

second pump

10

thermostat

11

heater

12

block

13

cylinder head

14

second heat exchanger

15

first inlet of the first valve

16

second inlet of the second valve

17

management

18

management

99

Outlet of the first valve

20

second valve

21

Inlet of the second valve

22

Output of the memory device

23

first outlet of the second valve

24

second outlet of the second valve

25

check valve

26

user

27

Refrigerant circuit of an automotive air conditioning system

28

compressor

29

third valve

30

first capacitor

31

fourth valve

32

Evaporator

33

bypass

34

second capacitor

35

radiator shutter

Claims (15)

Circuit arrangement (1) for a motor vehicle having a motor vehicle, in which a coolant is circulated, wherein in the circuit arrangement (1) at least a first heat exchanger (5) which cools an engine block (12) via a first coolant circuit (3), and at least a storage device (8) for heat to be delivered to a heater (11) is arranged in a second coolant circuit (3), characterized in that the storage device (8) is integrated into a third coolant circuit (4) for additional cooling of the engine block (12) , Circuit arrangement (1) according to claim 1, characterized in that the first heat exchanger (5) is a coolant radiator, in particular a high-temperature coolant radiator. Circuit arrangement (1) according to claim 1 or 2, characterized in that a line (17) of the third Kühimitteikreistaufs (4) in a first inlet (15) of a first valve (6) and a line (18) of the second coolant circuit (3) in a second inlet (16) of the first valve (6) open, via which the supply of the coolant from the second coolant circuit (3) and the supply of the coolant from the third coolant circuit (4) to the storage device (8) can be regulated. Circuit arrangement (1) according to claim 3, characterized in that the first valve (6) is an electrically, magnetically or electromagnetically operable valve, and wherein the first valve (6) has a switching time of less than 2 ms. Circuit arrangement (1) according to claim 3 or 4, characterized in that between the first valve (6) and the storage device (8), a first pump (7) is arranged. Circuit arrangement (1) according to one or more of claims 3 to 5, characterized in that by switching the first valve (6), the function of the memory device (8) can be changed as a heat storage and cold storage. Circuit arrangement (1) according to one or more of claims 1 to 6, characterized in that the memory device (8) has an output (22) which is connected to the heating device (11) and a cylinder head (13) of the internal combustion engine via the second coolant circuit ( 3) is connected. Circuit arrangement (1) according to claim 7, characterized. that the output (22) of the memory means (8) to the engine block (12) via the third cooling circuit (4) is connected. Circuit arrangement (1) according to claim 7 or 8, characterized gekennzeichet that the output (22) of the storage device (8) with an inlet (21) of a second valve (20) is connected. Circuit arrangement (1) according to claim 9, characterized in that the second valve (20) has a first outlet (23) and a second outlet (24). Circuit arrangement (1) according to claim 9 or 10, characterized in that the first outlet (23) of the second valve (20) directs the coolant into the third coolant circuit (4) to the engine block (12), and the second outlet (24) of the second valve (20) directs the coolant into the second coolant circuit (3) to the heater (11) and / or the cylinder head (13). Circuit arrangement (1) according to one or more of claims 1 to 11, characterized in that a second heat exchanger (14), in particular a low-temperature cooler, in the circuit arrangement (1) is provided. Circuit arrangement (1) according to one or more of claims 1 to 12, characterized in that the first heat exchanger (5) in the first coolant circuit (2) and the drifts coolant circuit (4) is integrated. Circuit arrangement (1) according to one or more of claims 1 to 12, characterized in that the first heat exchanger (5) in the first coolant circuit (2) is integrated, and the second heat exchanger (14) in the third coolant circuit (4) is integrated , Krelslaufanordnung (1) according to one or more of claims 1 to 14, characterized in that the storage device (8) is integrated in a refrigerant circuit (27) of an automotive air conditioning system.

Images