EP2317094B1 - Cooling circuit assembly - Google Patents

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. The coolant flowing through the coolant radiator is cooled by a 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 chilled water cooling could contribute greatly to an improvement of the combustion processes, especially in high load operation.

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

The pamphlets EP 1 331 113 A1 . DE 195 21 292 A1 and US Pat. No. 6,032,869 disclose circuit arrangements for a motor vehicle having a motor vehicle, in which a coolant is circulated, wherein in the circuit arrangement at least a first heat exchanger, which cools an engine block via a first coolant circuit, and at least one Storage device are arranged for to be delivered to a heater heat in a second coolant circuit.

Therefore, it is the object of the present invention to provide a circuit arrangement for a motor vehicle 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 circulation arrangement is provided for a motor vehicle having an internal combustion engine in which a coolant is circulated, wherein in the circuit arrangement at least one first heat exchanger, which cools an engine block via a first coolant circuit, 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 coolant circuit additional cooling, the storage device also serves as a cold water storage in this case. By incorporating the storage device in the third coolant circuit so cold water can be fed quickly through the third coolant circuit in the engine block and / or the cylinder head to cool this effectively and quickly. 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 arranged 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 radiator shutters is also advantageous for improving the aerodynamics and thus to reduce fuel consumption. However, by using the radiator shutter or by closing it to achieve the above-enumerated effects, the cooling performance of the coolant radiator is deteriorated because there is no longer enough wind to cool the coolant flowing through the coolant radiator. Therefore, in this case too, an additional cold water storage for cooling the engine block, which is achieved by the use of the storage device or its integration into the third refrigerant circuit, is particularly advantageous. Due to the configuration according to the invention, an extended transit time in shutter operation can advantageously be realized. In addition, a reduction in the thermal cycling of the coolant radiator is achieved by the circuit arrangement according to the invention. According to a preferred embodiment, the first heat exchanger is a Kühlmitteikühler, in particular a high-temperature coolant radiator.

A line of the third coolant circuit opens into a first inlet of a first valve and a line of the second coolant circuit opens 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 coolant circuit to the storage device is controllable. 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 operable valve, wherein the first valve preferably has a switching time of less than 2 s. By using the fast electrically or electromagnetically actuated valves, it is possible to quickly open the radiator path and thus to use the coolant, which is located in the coolant radiator, for rapid cooling down of the engine.

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

By switching the first valve, the function of the storage device as a heat storage and cold storage is changeable.

The storage device has an output which is connected to the heating device and a cylinder head of the internal combustion engine via the second coolant circuit.

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

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

The second valve has a first outlet and a second outlet.

The first outlet of the second valve directs the coolant into the third cooling circuit to the engine block, and the second outlet of the second valve directs the coolant into the second coolant loop to the heater.

Preferably, the coolant coming from the storage device via the third coolant circuit can be fed into the engine block via a pump suction side when the storage device acts as a kite pesher. Alternatively, it is possible to implement an intake in the region of the exhaust cow, 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.

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 cold coolant coming from the low-temperature cooler, the high-temperature coolant cooler cooling the engine block via the first coolant circuit.

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

Alternatively, the first Wärmetaucher in the first Kühlmittelkrefslauf and the second heat exchanger may be integrated into 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 Kreislaufanordnung eines nicht erfindungsgemäßen Beispiels;
• Fig.2 eine weitere Kreislaufanordnung gemäß einer Ausführungsform;
• Fig. 3 eine weitere Kreislaufanordnung gemäß einer Ausführungsform;
• Fig. 4 eine weitere Kreislaufanordnung gemäß einer Ausführungsform.

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 of a non-inventive example;
• Fig.2 another circuit arrangement according to an embodiment;
• Fig. 3 another circuit arrangement according to an embodiment;
• Fig. 4 another circuit arrangement according to an embodiment.

Fig. 1 shows a circuit arrangement 1 of a non-inventive example 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 drifted coolant circuit 4, softer indicated by a dashed line schematically is. 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, an engine block 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 coolant circuit 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 coolant circuit 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 can serve as a heat accumulator or heat accumulator, around the engine block 12 and the cylinder head 13 heated To store coolant and, if necessary, to a heater 11 for heating a passenger compartment of the motor vehicle.

In the third coolant 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 explained in more detail below 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 to close the second inlet 16, so that through the outlet 19 of the first valve 6 via the pump 7 cold coolant, the storage device 8 is supplied to stored 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, in this non-inventive example, for example, at a content of the storage device 8 of 3 liters of coolant, a previous storage tank 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 a short-term power of 1500 g / s * 3.5 J / g / K * 60K = 300 kW can be achieved within 2 s.

Fig. 2 shows a 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 refrigerant is supplied to the heater 11 via the second refrigerant circuit 3, and when the second valve 20 is controlled, it is switched 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, a check valve 25 is also provided in this embodiment.

Fig. 3 shows a further 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 in 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 circuit

3

second coolant circuit

4

third coolant circuit

5

first heat exchanger

6

first valve

7

first pump

8th

Speichereinnchtung

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

19

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 (10)

1. A circuit arrangement (1) for a vehicle comprising a combustion engine in which a coolant can circulate, wherein the circuit arrangement (1) comprises at least one first heat exchanger (5) cooling a motor block (12) via a first coolant circuit (2) and at least one storage installation (8) for giving off heat to a heating device (11) in a second coolant circuit (3), wherein the storage installation (8) in a third coolant circuit (4) is integrated for additional cooling of the motor block (12), wherein a conduit (17) of the third coolant circuit (4) leads into a first inlet (15) of a first valve (6) and a conduit (18) of the second coolant circuit (3) leads into a second inlet (16) of the first valve (6) via which the feed of the coolant from the second coolant circuit (3) and the feed of the coolant from the third coolant circuit (4) into the storage installation (8) can be regulated, wherein the use of the storage installation (8) as a heat storage facility and as a cold storage facility can be changed by switching the first valve (6) and the storage installation (8) comprises an outlet (22) which is connected to an inlet (21) of a second valve (20), wherein the first outlet (23) of the second valve (20) conducts the coolant into the third coolant circuit (4) to the motor block (12) and the second outlet (24) of the second valve (20) conducts the coolant into the second coolant circuit (3) to the heating device (11), characterised in that the outlet (22) of the storage installation (8) is connected to the heating device (11) and a cylinder head (13) of the combustion engine (3) via the second coolant circuit.
2. The circuit arrangement (1) according to claim 1, characterised in that the first heat exchanger (5) is a coolant cooler, in particular a high-temperature coolant cooler.
3. The circuit arrangement (1) according to claim 1 or 2, characterised 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 s.
4. The circuit arrangement (1) according to claim 1, 2 or 3, characterised in that a first pump (7) is arranged between the first valve (6) and the storage installation (8).
5. The circuit arrangement (1) according to one of the preceding claims, characterised in that the outlet (22) of the storage installation (8) is connected to the motor block (12) via the third coolant circuit (4).
6. The circuit arrangement (1) according to one of the preceding claims, characterised in that the second valve (20) comprises a first outlet (23) and a second outlet (24).
7. The circuit arrangement (1) according to one of the preceding claims, characterised in that a second heat exchanger (14), in particular a low temperature cooler, is provided in the circuit arrangement (1).
8. The circuit arrangement (1) according to one of the preceding claims, characterised in that the first heat exchanger (5) is integrated into the first coolant circuit (2) and the third coolant circuit (4).
9. The circuit arrangement (1) according to one of the preceding claims, characterised in that the first heat exchanger (5) is integrated into the first coolant circuit (2) and the second heat exchanger (14) is integrated into the third coolant circuit (4).
10. The circuit arrangement (1) according to one of the preceding claims, characterised in that the storage installation (8) is integrated into a refrigerant circuit (27) of an air conditioning system of a vehicle.

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