WO2017061438A1

WO2017061438A1 - Vehicular cooling device

Info

Publication number: WO2017061438A1
Application number: PCT/JP2016/079528
Authority: WO
Inventors: 進作山口
Original assignee: いすゞ自動車株式会社
Priority date: 2015-10-08
Filing date: 2016-10-04
Publication date: 2017-04-13
Also published as: JP2017072092A; JP6641865B2

Abstract

A water-cooled intercooler 13 and a water-cooled condenser 23 are disposed in parallel downstream of a sub-radiator 52 of a secondary cooling circuit 50 with respect to the flow of cooling water W3. A first outlet 53, which serves as an outlet for the cooling water W3 supplied to the water-cooled intercooler 13, and a second outlet 54, which serves as an outlet for the cooling water W4 supplied to the water-cooled condenser 23, are formed in the sub-radiator 52. The second outlet 54 is disposed further downstream an internal flow path 55 of the sub-radiator 52 than the first outlet 53.

Description

Vehicle cooling system

The present disclosure relates to a vehicle cooling device, and more particularly, to a vehicle cooling device that efficiently cools each of an engine, an intercooler, and a condenser for air conditioning refrigerant.

Cooling devices for large vehicles such as trucks are equipped with a sub-radiator that is separate from the radiator that cools the engine cooling water, and the cooling water cooled by the sub-radiator is supplied to the water-cooled intercooler for supercharging. Attention has been focused on devices that improve the exhaust gas performance and fuel consumption by increasing the intake air amount without increasing the work of the aircraft.

Also, in a large vehicle, the load is larger and the weight of the vehicle is larger than that of a passenger car, so the engine load increases, and accordingly, the amount of heat released by an engine heat exchanger such as an intercooler or a radiator increases. Therefore, the air-cooled condenser for cooling the air-conditioning refrigerant used in the vehicle interior air conditioner cannot be placed on the engine heat exchanger.

Also, in large vehicles, high load running is frequently used, so an engine axial fan with a large amount of air flow is used as a cooling fan for blowing air to the engine heat exchanger. Therefore, the cooling air for cooling the air-cooled condenser cannot be controlled in a situation where the air-cooled condenser needs to be cooled.

Therefore, a water-cooled condenser that cools the air-conditioning refrigerant by exchanging heat with the cooling water has attracted attention.

In connection with this, there has been proposed a device for supplying cooling water having a lower temperature than the cooling water cooled by the sub-radiator to the water-cooled intercooler or the water-cooled condenser (for example, see Patent Document 1).

However, this device is configured to supply cooling water cooled by one sub-radiator to a water-cooled intercooler or a water-cooled condenser. As a result, the cooling water is first supplied to the water-cooled condenser having a low temperature range, and the cooling water heated by the water-cooled condenser is supplied to the next water-cooled intercooler. There is a problem that the cooler cannot be cooled efficiently.

JP 2005-186879 A

An object of one aspect of the present disclosure is to provide a vehicular cooling device that can efficiently cool each of an engine, an intercooler, and a condenser for an air conditioning refrigerant to improve fuel efficiency.

One aspect of the vehicle cooling device that achieves the above object includes a radiator that cools a first cooling water of an engine, and a second cooling that is supplied to a water-cooled intercooler that cools intake air supercharged by a supercharger. A sub-radiator that has a first outlet for supplying water and a second outlet for supplying the second cooling water supplied to a water-cooled condenser for cooling the air-conditioning refrigerant, and cools the second cooling water. Prepared,
The water-cooled intercooler and the water-cooled condenser are arranged in parallel downstream of the sub-radiator with respect to the flow of cooling water,
The second outlet is arranged downstream of the internal passage of the sub radiator from the first outlet.

Further, in the above vehicle cooling device, the sub-radiator includes a first tank, a second tank, and a partition plate for partitioning the inside of each of the first tank and the second tank, and a plurality of the internal flow paths are provided in the internal flow path. The first outlet may be disposed in one of the first tank and the second tank, and the second outlet may be disposed in the other.

The vehicle cooling device includes a main cooling circuit having the radiator, and a sub-cooling circuit having the sub radiator and independent from the main cooling circuit,
The main cooling circuit includes a cooling passage in which the first cooling water circulates in the order of a mechanical water pump, the engine, the radiator, and the mechanical water pump, and the first cooling water is the mechanical water pump, It is constituted by a bypass passage that bypasses the radiator so as to circulate in the order of the engine and the mechanical water pump,
The sub-cooling circuit is configured so that the second cooling water circulates in order of one of the electric water pump, the sub-radiator, the water-cooled intercooler, and the water-cooled condenser, and the electric water pump. May be.

Further, in the vehicle cooling device, an auxiliary electric water pump that adjusts the flow rate of the cooling water flowing through the water-cooled condenser may be interposed between the sub-radiator and the water-cooled condenser.

Further, the vehicle cooling device includes a main cooling circuit having the radiator, and a sub cooling circuit having the sub radiator and branching from the main cooling circuit,
The main cooling circuit includes a cooling passage in which cooling water circulates in the order of mechanical water pump, the engine, and the radiator, and the first cooling water circulates in order of the mechanical water pump and the engine. Consists of a bypass passage that bypasses the radiator,
The sub-cooling circuit is configured to circulate cooling water in the order of the mechanical water pump, the sub-radiator, the water-cooled intercooler, the water-cooled condenser, and the mechanical water pump. It may be.

It has a water-cooled EGR cooler that cools EGR gas,
The water-cooled intercooler, the water-cooled EGR cooler, and the water-cooled condenser are arranged in parallel downstream of the sub-radiator with respect to the flow of cooling water,
The cooling water discharged from the first outlet may be supplied to the water-cooled EGR cooler.

The cooling water discharged from the first outlet may be supplied to the water-cooled EGR cooler disposed on the downstream side of the plurality of water-cooled EGR coolers interposed in the EGR passage of the engine.

According to the vehicle cooling device of one aspect of the present disclosure, the water-cooled intercooler and the water-cooled condenser are arranged in parallel downstream of the sub-radiator, so that both the water-cooled intercooler and the water-cooled condenser are Cooling water cooled by a radiator can be supplied. Furthermore, by forming the sub-radiator with the first outlet and the second outlet disposed downstream of the first outlet, the cooling water supplied to the water-cooled intercooler is provided in the water-cooled condenser. Cooling water with a lower water temperature can be supplied. Thereby, each of an engine, a water-cooled intercooler, and a water-cooled condenser having different temperature zones can be cooled more efficiently.

In particular, by supplying the cooling water cooled by the sub-radiator directly to the water-cooled intercooler, the intake air supercharged by the supercharger can be cooled effectively, increasing the work of the supercharger. Therefore, the fuel consumption can be improved while increasing the amount of intake air and suppressing the deterioration of the exhaust gas performance.

In addition, the cooling water cooled by the sub-radiator can be directly supplied to the water-cooled condenser, so that the air-conditioning refrigerant can be effectively cooled. Can be improved.

FIG. 1 is a configuration diagram illustrating a vehicle cooling device according to the first embodiment. FIG. 2 is a perspective view illustrating the configuration of the radiator and the sub-radiator of FIG. FIG. 3 is a configuration diagram illustrating a modification of the vehicle cooling device of the first embodiment. FIG. 4 is a configuration diagram illustrating the vehicle cooling device of the second embodiment. FIG. 5 is a configuration diagram illustrating a modification of the vehicle cooling device of the second embodiment. FIG. 6 is a configuration diagram illustrating the vehicle cooling device of the third embodiment.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. FIG. 1 illustrates a vehicle cooling device 30 according to the first embodiment of the present disclosure. The vehicle cooling device 30 cools each of the engine 10, the water-cooled intercooler 13, and the water-cooled condenser 23 mounted on the vehicle.

In the engine 10, after the intake air A sucked into the intake passage 11 during driving of the vehicle is compressed by the compressor (supercharger) 12 a of the turbocharger 12 and becomes high temperature and cooled by the water-cooled intercooler 13, It is supplied to the engine body 15 via the intake manifold 14. The intake air A supplied to the engine body 15 is mixed with fuel in the cylinder and combusted to generate heat energy, then becomes exhaust gas G1 and is exhausted from the exhaust manifold 16 to the exhaust passage 17 to be turbocharged. After the 12 turbines 12b are driven, they are purified by an exhaust gas purification device (not shown) and then released into the atmosphere.

When the vehicle interior air conditioner 20 is in use, the air conditioning compressor 22 is driven by the electromagnetic clutch 21 with the driving force transmitted from the crankshaft 18 of the engine 10 via the power transmission mechanism 19. The air-conditioning refrigerant R compressed by the air-conditioning compressor 22 is cooled by a water-cooled condenser 23 in a high-temperature and high-pressure semi-liquid state, and further liquefaction proceeds. Moisture is removed. The liquefied air-conditioning refrigerant R is jetted into the evaporator 26 through a minute nozzle hole of the expansion valve 25 and vaporizes, and the evaporator 26 is cooled by removing heat from the evaporator 26 with the heat of vaporization at that time. Then, the heat passing through the evaporator 26 cooled by the electric fan 27 supplied with electric power is sent as cooling air to the vehicle interior.

The vehicle cooling device 30 includes a cooling fan 31 that is connected to and driven by the crankshaft 18, a main cooling circuit 40, and a sub cooling circuit 50. The main cooling circuit 40 and the sub cooling circuit 50 are independent circuits, and hereinafter, the cooling water flowing through each of them will be distinguished from the first cooling water W1 and the second cooling water W2.

In the main cooling circuit 40, the first cooling water W1 is circulated in the order of the mechanical water pump 41, the engine body 15, the thermostat 42, the radiator 43, and the mechanical water pump 41, and the first cooling water is mechanical. The water pump 41, the engine body 15, the thermostat 42, and the mechanical water pump 41 are configured in order of a bypass passage 45 that bypasses the cooling passage 44. Therefore, the main cooling circuit 40 is a circuit in which the first cooling water W1 for cooling the engine body 15 is circulated.

In the sub-cooling circuit 50, the second cooling water W2 is a circuit independent of the main cooling circuit 40, and one of the electric water pump 51, the sub-radiator 52, the water-cooled intercooler 13 and the water-cooled condenser 23, and the electric motor It circulates in order of the water pump 51. Therefore, the sub-cooling circuit 50 is a circuit in which the second cooling water W2 for cooling the water-cooled intercooler 13 and the water-cooled condenser 23 is circulated.

The mechanical water pump 41 is mechanical, and the rotational power of the engine body 15 is transmitted from the crankshaft 18 via a power transmission mechanism 19 such as an endless belt or gear mechanism, and is driven by this rotational power. .

The thermostat 42 is arranged on the outlet side of the main body 15 of the main cooling circuit 40. The thermostat 42 has a lifter (not shown) that expands and contracts by a thermal expansion body that has the property of expanding as the temperature rises and shrinking as the temperature decreases, and the first cooling water heated by the engine body 15. The flow rate of the first cooling water W 1 flowing through the cooling passage 44 and the bypass passage 45 is adjusted by extending and contracting the lifter according to the temperature of W 1. An electrothermal thermostat in which the lift is forcibly expanded and contracted by electric heating may be used for the thermostat 42.

As in this embodiment, the thermostat 42 is disposed on the outlet side of the engine body 15 of the main cooling circuit 40, and the water temperature of the first cooling water W1 is controlled on the outlet side. In addition, the air bleedability can be improved and the occurrence of cavitation can be suppressed, which is advantageous for improving the durability, and is particularly suitable for a large vehicle such as a truck.

In addition, it can replace with exit control and the entrance control which has arrange | positioned the thermostat 42 in the entrance side of the engine main body 15 of the main cooling circuit 40 is also applicable. In the case of the inlet control, it is advantageous in terms of temperature adjustment of the first cooling water W1 as compared with the outlet control.

The radiator 43 is disposed on the front side of the vehicle on which the engine 10 and the vehicle cooling device 30 are mounted, and the cooling fan 31 is disposed behind the radiator 43. The radiator 43 cools the first cooling water W 1 that passes through the interior using the vehicle speed wind and the cooling air from the subsequent cooling fan 31.

The electric water pump 51 is a pump driven by electric power generated by an alternator (not shown). The sub radiator 52 is disposed on the front side of the vehicle with respect to the radiator 43, and is disposed on the front side of the radiator 43, thereby enhancing the cooling effect by the vehicle speed wind.

In such a vehicular cooling device 30, the sub-cooling circuit 50 includes the water-cooled intercooler 13 and the water-cooled condenser 23 arranged in parallel downstream of the sub-radiator 52. Then, a first outlet 53 serving as an outlet of the second cooling water W3 supplied to the water-cooled intercooler 13 to the sub radiator 52 and a second outlet 54 serving as an outlet of the second cooling water W4 supplied to the water-cooled condenser 23 are provided. The second outlet 54 is arranged downstream of the internal flow passage 55 which is the flow passage of the second cooling water W2 flowing through the sub radiator 52 rather than the first outlet 53.

In other words, the vehicular cooling device 30 supplies the second cooling water W3 to the water-cooled intercooler 13 by forming two of the first outlet 53 and the second outlet 54 in the sub-radiator 52, and the water-cooled condenser The second cooling water W3 is supplied to the second cooling water W4 having a different temperature range. In addition, since the second cooling water W4 discharged from the second outlet 54 is cooled by the sub radiator 52 longer than the second cooling water W3 discharged from the first outlet 53, the temperature of the second cooling water W4 T4 becomes lower than the temperature T3 of the second cooling water W3.

The first cooling water W1 exchanges heat with the engine body 15, and the mechanical water pump is selected by selecting whether the thermostat 42 passes the cooling passage 44 or the bypass passage 45 depending on the temperature after the heat exchange. The temperature T1 of the first cooling water W1 supplied from 41 to the engine body 15 is adjusted. When the second cooling water W2 exits from the sub-radiator 52, the second cooling water W3 and the second cooling water W4 are branched into two, and the second cooling water W3 exchanges heat with the intake air A passing through the water-cooled intercooler 13. Then, the second cooling water W4 joins after heat exchange with the air conditioning refrigerant R passing through the water-cooled condenser 23. Therefore, the temperature T1 of the first cooling water W1 discharged from the mechanical water pump 41, the temperature T2 of the second cooling water W2, the temperature T3 of the second cooling water W3 after passing through the sub radiator 52, and the sub radiator 52 are For example, the temperature T1 is 60 degrees or more and 90 degrees or less, the temperature T2 is 70 degrees or more and 90 degrees or less, the temperature T3 is 40 degrees or more, 60 The temperature T4 is 50 degrees or less.

The operation of the vehicle cooling device 30 will be described. In the main cooling circuit 40 of the vehicular cooling device 30, when the engine 10 is started, the mechanical water pump 41 is driven and the circulation of the first cooling water W1 is started. When the temperature of the first cooling water W1 on the outlet side of the engine 10 is less than the warm-up temperature Ta set to, for example, 60 degrees or more and 80 degrees or less immediately after the engine 10 is started, the main cooling circuit 40 is a thermostat. 42 is closed and the first cooling water W1 is warmed up via the bypass passage 45. On the other hand, when the temperature of the first cooling water W1 on the outlet side of the engine 10 is equal to or higher than the warm-up temperature Ta, the thermostat 42 is opened and the first cooling water W1 is passed through the cooling passage 44 and the first cooling water W1 is supplied. Cooling with the radiator 43.

In the sub cooling circuit 50, when the engine 10 is started, the electric water pump 51 is driven and the circulation of the second cooling water W2 is started. In the sub-cooling circuit 50, the second cooling water W3 cooled between the first outlet 53, which is in the middle of the internal flow path 55 of the sub-radiator 52, is supplied to the water-cooled intercooler 13, and the water cooling In the intercooler 13, the intake air A is cooled by heat exchange between the second cooling water W 3 and the intake air A that is supercharged by the compressor 12 a.

Further, in the sub-cooling circuit 50, the second cooling water W4 cooled between the second outlet 54, which is the terminal position of the internal flow path 55 of the sub-radiator 52, is supplied to the water-cooled condenser 23. The air-conditioning refrigerant R is cooled by heat exchange between the second cooling water W4 and the air-conditioning refrigerant R that has been liquefied by the air-conditioning compressor 22 in the condenser 23.

In this manner, the water-cooled intercooler 13 and the water-cooled condenser 23 are arranged in parallel downstream of the sub-radiator 52 of the sub-cooling circuit 50, and cooling water is simultaneously supplied to each of the water-cooled intercooler 13 and the water-cooled condenser 23. Since the air is supplied, the intake air A and the air conditioning refrigerant R can be simultaneously cooled by the second cooling waters W3 and W4 cooled by the sub radiator 52. Further, since the sub-radiator 52 is formed with the first outlet 53 and the second outlet 54 arranged downstream of the first outlet 53 in the internal flow path 55, the water-cooled condenser 23 has a water-cooled intercooler. The second cooling water W4 having a lower water temperature than the second cooling water W3 supplied to 13 can be supplied. Thereby, the cooling water of the water temperature suitable for each of the water cooling type | mold intercooler 13 and the water cooling type | mold condenser 23 from which temperature zones differ can be supplied, and it can cool more efficiently.

In particular, by supplying the second cooling water W3 cooled by the sub radiator 52 directly to the water-cooled intercooler 13, the intake air A supercharged by the compressor 12a of the turbocharger 12 can be effectively cooled. Therefore, without increasing the work of the compressor 12a, the amount of the intake air A can be increased, and the fuel efficiency can be improved while suppressing the deterioration of the exhaust gas performance.

Further, since the second cooling water W4 further cooled by the sub radiator 52 is directly supplied to the water-cooled condenser 23, the air conditioning refrigerant R can be effectively cooled. Deterioration can be prevented and fuel consumption can be further improved.

Furthermore, by using the water-cooled condenser 23 that cools the air-conditioning refrigerant R with the second cooling water W4 in the vehicle interior air conditioner 20, the electric fan that is essential in the air cooling system can be eliminated. Power consumption during use of the device 20 can be suppressed, and a load on an alternator (not shown) can be reduced to further improve fuel efficiency.

In addition, since the vehicular cooling device 30 includes the main cooling circuit 40 and the sub cooling circuit 50 that are independent from each other, the sub cooling circuit 50 is affected by the first cooling water W 1 circulating through the main cooling circuit 40. In other words, since the main cooling circuit 40 and the sub cooling circuit 50 can be set to different temperature zones, the second cooling water having a lower water temperature than the main cooling circuit 40 in the sub cooling circuit 50 without performing complicated control. W2 can be circulated. Thereby, the cooling water of the water temperature suitable for each with respect to the engine from which a temperature zone differs, the water cooling type intercooler 13, and the water cooling type | mold condenser 23 can be supplied, and it can cool efficiently.

Next, a detailed configuration of the sub radiator 52 will be described with reference to FIG. FIG. 2 is a perspective view illustrating the radiator 43 and the sub radiator 52. In FIG. 2, white arrows indicate the cooling waters W1 to W4.

In the radiator 43, an upper tank 47 (first tank) and a lower tank 48 (second tank) are arranged above and below a radiator core 46 composed of a number of flat tubes through which the first cooling water W1 flows and fins for heat dissipation. It is a down-flow type radiator. Further, the radiator 43 is a radiator in which the inlet 47a of the first cooling water W1 is disposed in the upper tank 47, and the outlet 48b of the cooling water is disposed in the lower tank 48, so that the flow path is not folded back.

The sub-radiator 52 is a side flow type radiator in which an upper tank 57 and a lower tank 58 are arranged on the left and right of a radiator core 56 composed of a number of flat tubes through which the second cooling water W2 flows and fins for heat dissipation. The sub-radiator 52 is a radiator in which the inner tank 55 is partitioned by partition plates 59a to 59c inside the upper tank 57 and the lower tank 58, and the number of times of folding of the internal flow path 55 is made. Is a radiator with a maximum of 4 paths. The inlet 57a of the second cooling water W2 is arranged in the upper tank 57, the first outlet 53 is arranged in one of the upper tank 57 and the lower tank 58, and the second outlet 54 is arranged in the other. Specifically, the first outlet 53 of the second cooling water W3 is disposed in the lower tank 58, and the second outlet 54 of the second cooling water W4 is disposed in the upper tank 57.

That is, in the sub radiator 52, the first outlet 53 is disposed when the number of turns of the internal flow path 55 is 3 passes, and the second outlet 54 is disposed when the number of turns of the internal flow path 55 is 4 passes. .

The partition plates 59a to 59c make the width of the flow path uniform up to the third path of the internal flow path 55 and make the upper tank 57 and the fourth path narrower than the width of the flow path up to the third path. Arranged in the lower tank 58. By disposing the partition plates 59a to 59c in this way, the flow rate of the second cooling water W3 can be made larger than that of the second cooling water W4. Therefore, a water-cooled intercooler that requires a higher temperature zone and a higher flow rate is required. 13 can supply more flow rate.

In this embodiment, the

partition plates

59a and 59c are arranged in the upper tank 57, the partition plate 59b is arranged in the lower tank 58, and the number of folding of the internal flow path 55 is set to 4 paths at maximum. The number of turns may be two or more passes. Moreover, although the width of the flow path of the 4th pass was made narrow, you may make the width of each flow path uniform.

In this way, the sub-radiator 52 is divided into the upper tank 57 and the lower tank 58 by the partition plates 59a to 59c so that the number of turns of the internal flow path 55 is plural, and the upper tank 57 and the lower tank 58 are connected to the first one. By arranging one outlet 53 and the second outlet 54 on the other side, the second outlet 54 can be arranged downstream of the internal flow channel 55 from the first outlet 53. As a result, the second cooling water W4 discharged from the second outlet 54 has a lower water temperature than the second cooling water W3 that has been folded three times by four turns, and the second cooling of the low water temperature is performed in the water-cooled condenser 23. Water W4 can be supplied.

Further, the second cooling water W3 having a large flow rate is supplied to the water-cooled intercooler 13 that requires a large flow rate, and the second cooling water W4 having a small flow rate is supplied to the water-cooled condenser 23 that requires a relatively small flow rate. By supplying, it can avoid that the water-cooled intercooler 13 falls into insufficient cooling.

Further, the radiator 43 is constituted by a one-pass down-flow type radiator, and the sub-radiator 52 disposed on the front side of the radiator 43 is constituted by a side-flow type radiator having a maximum of four passes, and above the sub-radiator 52. Therefore, the temperature on the lower side of the radiator 43 can be prevented from rising due to the influence of the sub radiator 52.

FIG. 3 shows a modification of the vehicle cooling device 30 according to the first embodiment of the present disclosure. In the modification of the first embodiment, an auxiliary electric water pump 60 that adjusts the flow rate of the second cooling water W4 flowing through the water-cooled condenser 23 between the sub-radiator 52 of the sub-cooling circuit 50 and the water-cooled condenser 23 is provided. It is installed.

In this way, when the auxiliary electric water pump 60 is interposed, when the air conditioning refrigerant R needs to be cooled, the auxiliary electric water pump 60 is driven to supply the necessary second cooling water W4. be able to. On the other hand, when the air conditioning refrigerant R does not need to be cooled, that is, when the vehicle interior air conditioner 20 is not activated, the auxiliary electric water pump 60 is stopped to supply the second cooling water W4 to the water-cooled condenser 23. Without this, it can be turned to the water-cooled intercooler 13. As a result, the cooling water cooled by the sub radiator 52 can be efficiently cooled without being wasted.

FIG. 4 illustrates the vehicle cooling device 30 according to the second embodiment of the present disclosure. In the vehicular cooling device 30 of the second embodiment, in addition to the configuration of the first embodiment, a water-cooled EGR cooler 71 provided in an EGR (Exhaust Gas Recirculation) passage 70 is disposed on the downstream side of the sub-radiator 52. Arranged in parallel with the intercooler 13 and the water-cooled condenser 23, the second cooling water W3 discharged from the first outlet 53 is branched and supplied to the water-cooled EGR cooler 71.

The engine 10 includes an EGR passage 70 that recirculates the EGR gas G2 from the exhaust passage 17 to the intake passage 11. A water-cooled EGR cooler 71 and an EGR valve 72 are interposed in the EGR passage 70. When opened, the EGR gas G2 is configured to recirculate.

Since the second cooling water W3 is branched and supplied to the water-cooled EGR cooler 71, the main cooling circuit 40 is added to the water-cooled EGR cooler 71 in addition to the water-cooled intercooler 13 and the water-cooled condenser 23. Since the EGR gas G2 passing through the water-cooled EGR cooler 71 can be effectively cooled by supplying the second cooling water W3 having a lower temperature than the circulating first cooling water W1, it is contained in the exhaust gas G1. NOx can be further reduced.

When the number of cylinders of the engine 10 is large in a large vehicle, a plurality of EGR passages 70 that recirculate the EGR gas G2 are provided in separate cylinders, and a water-cooled EGR cooler 71 is provided in each of the plurality of EGR passages 70. You may comprise so that it may be interposed. When the number of cylinders of the engine 10 is large as described above, the amount of EGR gas G2 cooled by the water-cooled EGR coolers 71 at a time by the plurality of water-cooled EGR coolers 71 provided in the plurality of EGR passages 70, respectively. If E is reduced, the EGR gas G2 can be efficiently cooled. Further, the EGR passage 70 may be a low pressure type branching from the exhaust passage 17 downstream of the turbocharger 12 in addition to the high pressure type branching from the exhaust passage 17 upstream of the turbocharger 12.

FIG. 5 shows a modification of the vehicle cooling device 30 according to the second embodiment. In the engine 10, a plurality of water-cooled

EGR coolers

71 and 73 are arranged in the EGR passage 70. Each of the water-cooled

EGR coolers

71 and 73 is arranged in series with the EGR passage 70, and the EGR gas G2 is first cooled after passing through the water-cooled EGR cooler 71 arranged on the upstream side of the EGR passage 70. The water-cooled EGR cooler 73 disposed on the downstream side is further cooled. In this way, when the water-cooled

EGR coolers

71 and 73 are arranged in series, the temperature zones of the respective water-cooled

EGR coolers

71 and 73 are made different from each other, and the subsequent stage of the water-cooled EGR cooler 71 in the previous stage is different. It is desirable to lower the temperature zone of the water-cooled EGR cooler 73.

Accordingly, in the vehicular cooling device 30, the first cooling water W 1 of the main cooling circuit 40 is supplied to the water-cooled EGR cooler 71 disposed on the upstream side of the EGR passage 70, while the sub-radiator 52 of the sub-cooling circuit 50 The cooled second cooling water W3 is configured to be supplied to a water-cooled EGR cooler 73 disposed on the downstream side of the EGR passage 70.

In the vehicular cooling device 30, the upstream-side water-cooled EGR cooler 71 is supplied with the first cooling water W 1 having a relatively high temperature, and the downstream-side water-cooled EGR cooler 73 supplies the low-temperature second cooling water W 3. Is supplied. Accordingly, the upstream water-cooled EGR cooler 71 to which the high-temperature first cooling water W1 is supplied takes the rough heat of the high-temperature EGR gas G2, and then the downstream at which the lower-temperature second cooling water W3 is supplied. Cool to a lower temperature with the water-cooled EGR cooler 73 on the side. That is, the EGR gas G2 is cooled to a lower temperature by cooling in stages with the water-cooled EGR cooler 71 and the water-cooled EGR cooler 73 in different temperature zones.

In this way, the EGR gas G2 is cooled stepwise, specifically, first by the water-cooled EGR cooler 71 disposed on the upstream side of the EGR passage 70, and then cooled by the water-cooled EGR cooler 73 disposed on the downstream side. By doing so, the EGR gas G2 can be reliably cooled to a lower temperature. Further, the water-cooled EGR cooler 71 arranged on the upstream side and the water-cooled EGR cooler 73 arranged on the downstream side are respectively independent circuits, and the temperature zones of the first cooling water W1 and the second cooling water W3 are different. By making it, the cooling efficiency in each cooling circuit of the main cooling circuit 40 and the subcooling circuit 50 can be improved more. As a result, the engine main body 15, the intake air A, the air conditioning refrigerant R, and the EGR gas G2 can all be efficiently cooled.

In addition, the EGR gas G2 after heat exchange with the upstream water-cooled EGR cooler 71 is cooled by the second cooling water W3 circulating in the sub-cooling circuit 50 with the downstream water-cooled EGR cooler 73. Since the temperature of the second cooling water W3 after heat exchange with the water-cooled EGR cooler 73 on the downstream side can be lowered, the temperature of the second cooling water W2 circulating in the sub cooling circuit 50 can be lowered. Thus, even if the subcooling circuit 50 is configured to cool the water-cooled EGR cooler 73, the low-temperature second cooling water W3 and the second cooling suitable for the water-cooled intercooler 13 and the water-cooled condenser 23, respectively. Water W4 can be supplied to improve each cooling effect.

In this embodiment, the configuration in which the first cooling water W1 that circulates the main cooling circuit 40 is supplied to the water-cooled EGR cooler 71 on the upstream side of the EGR passage 70 is described as an example. You may make it the structure which supplies the cooling water which circulates through the cooling circuit for EGR.

FIG. 6 illustrates the vehicle cooling device 30 according to the third embodiment of the present disclosure. The vehicle cooling device 30 of the third embodiment is configured such that the main cooling circuit 40 and the sub cooling circuit 50 are not independent from each other, and the sub cooling circuit 50 branches from the main cooling circuit 40.

In this embodiment, two outlets of the mechanical water pump 41 are formed. In the sub-cooling circuit 50, the second cooling water W2 circulates in the order of the mechanical water pump 41, the sub-radiator 52, the water-cooled intercooler 13 and the water-cooled condenser 23, and the mechanical water pump 41. Configured to do.

The sub cooling circuit 50 is preferably branched from one outlet of the mechanical water pump 41 and merged downstream of the thermostat 42, and merged downstream of the radiator 43 in the cooling passage 44 or downstream of the bypass passage 45. Is more preferable. When the second cooling water W2 of the sub-cooling circuit 50 joins the first cooling water W1 upstream of the thermostat 42, the temperature of the second cooling water W2 is higher than the warm-up temperature Ta. Even when the temperature T1 does not reach the warm-up temperature Ta, the thermostat 42 may open and the first cooling water W1 may be cooled by the radiator 43. Further, when the temperature T2 is lower than the warm-up temperature Ta, the thermostat 42 may be closed and the first cooling water W1 may not be cooled by the radiator 43 even if the temperature T1 of the first cooling water W1 is equal to or higher than the warm-up temperature Ta. Therefore, by causing the sub cooling circuit 50 to join the main cooling circuit 40 downstream of the thermostat 42, the influence on the adjustment of the temperature of the main cooling circuit 40 can be suppressed.

As can be seen from this embodiment, the present invention can also be applied to the sub-cooling circuit 50 that branches from the main cooling circuit 40 and joins the main cooling circuit 40. In addition, this 3rd embodiment can also be comprised so that the 2nd cooling water W3 may be supplied to a water cooling type EGR cooler like 2nd embodiment.

This application is based on a Japanese patent application (2015-199999) filed on October 8, 2015, the contents of which are incorporated herein by reference.

At the same time, it is useful in that the cooling water cooled by the sub-radiator can be supplied to both the water-cooled intercooler and the water-cooled condenser.

DESCRIPTION OF SYMBOLS 10 Engine 12 Turbocharger 12a Compressor 13 Water-cooled intercooler 20 Car interior air conditioner 23 Water-cooled condenser 30 Vehicle cooling device 40 Main cooling circuit 41 Mechanical water pump 43 Radiator 50 Sub cooling circuit 51 Electric water pump 52 Sub radiator 53 First One outlet 54 Second outlet 55 Internal flow path A Intake R Air-conditioning refrigerants W1 to W4 Cooling water

Claims

A radiator for cooling the first cooling water of the engine;
A first outlet for supplying a second cooling water supplied to a water-cooled intercooler for cooling intake air supercharged by a supercharger; and the second cooling water supplied to a water-cooled condenser for cooling an air-conditioning refrigerant. A sub-radiator for cooling the second cooling water,
In a vehicle cooling device comprising:
The water-cooled intercooler and the water-cooled condenser are arranged in parallel downstream of the sub-radiator with respect to the flow of cooling water,
The vehicular cooling device, wherein the second outlet is disposed downstream of the internal passage of the sub radiator from the first outlet.
The sub-radiator includes a first tank, a second tank, and a partition plate that partitions the interior of each of the first tank and the second tank, and a plurality of folding numbers are formed in the internal flow path. The vehicle cooling device according to claim 1, wherein the first outlet is disposed in one of the tank and the second tank, and the second outlet is disposed in the other.
A main cooling circuit having the radiator, and a sub-cooling circuit having the sub-radiator and independent from the main cooling circuit,
The main cooling circuit includes a cooling passage in which the first cooling water circulates in the order of a mechanical water pump, the engine, the radiator, and the mechanical water pump, and the first cooling water is the mechanical water pump, It is constituted by a bypass passage that bypasses the radiator so as to circulate in the order of the engine and the mechanical water pump,
The sub-cooling circuit is configured such that the second cooling water circulates from one of the electric water pump, the sub-radiator, the water-cooled intercooler, and the water-cooled condenser, and the electric water pump in this order. The vehicle cooling device according to claim 1 or 2.
The vehicle cooling device according to claim 3, wherein an auxiliary electric water pump for adjusting a flow rate of cooling water flowing through the water-cooled condenser is interposed between the sub-radiator and the water-cooled condenser.
A main cooling circuit having the radiator, and a sub cooling circuit having the sub radiator and branched from the main cooling circuit,
The main cooling circuit includes a cooling passage in which cooling water circulates in the order of mechanical water pump, the engine, and the radiator, and the first cooling water circulates in order of the mechanical water pump and the engine. Consists of a bypass passage that bypasses the radiator,
The sub-cooling circuit is configured to circulate cooling water in the order of the mechanical water pump, the sub-radiator, the water-cooled intercooler, the water-cooled condenser, and the mechanical water pump. The vehicle cooling device according to claim 1 or 2.
It has a water-cooled EGR cooler that cools EGR gas,
The water-cooled intercooler, the water-cooled EGR cooler, and the water-cooled condenser are arranged in parallel downstream of the sub-radiator with respect to the flow of cooling water,
6. The vehicle cooling device according to claim 1, wherein cooling water discharged from the first outlet is supplied to the water-cooled EGR cooler.
The cooling water discharged from the first outlet is supplied to the water-cooled EGR cooler disposed on the downstream side of the plurality of water-cooled EGR coolers interposed in the EGR passage of the engine. The vehicle cooling device as described.