JPH06137147A - Cooling device for water cooling type internal combustion engine for vehicle - Google Patents

Abstract

PURPOSE:To downsize and thin a radiator for cooling an internal combustion engine without reducing the capacity of a condenser for a cooler. CONSTITUTION:A radiator 10 for cooling an internal combustion engine is arranged on cooling wind upstream side from a condenser 20 for a cooler which constitutes a stream compression type refrigeration cycle. The radiator 10 is cooled by car speed wind or cooling wind generated by a cooling fan 30, heated cooling wind is guided by a shroud 32 so as to cool the condenser 20. Since the condenser at the radiator 10 is not installed in front of the vehicle, car speed cooling wind is led directly to the radiator 10, heat is lost from the radiator 10, the cooling water temperature of the internal combustion engine is reduced effectively, and cooling performance of the internal combustion engine is improved sharply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system for a water-cooled internal combustion engine for a vehicle, and more particularly to an arrangement structure of a radiator and a condenser.

[0002]

2. Description of the Related Art Conventionally, in a vehicle equipped with a water-cooled internal combustion engine and a cooling device, an actual engine has been installed in Sho 63-17761.
As shown in Japanese Patent Publication No. 8, a condenser which constitutes a cooling device is generally arranged in front of a radiator which constitutes a cooling system of an internal combustion engine. In this type, when the cooling device operates, the cooling air taken in from the front of the vehicle is heated by the condenser, and the radiator is cooled by the heated cooling air.

[0003]

Generally, when driving at low speed in a traffic jam such as summer, the internal combustion engine generates a large amount of heat,
The vehicle speed air volume is small and the cooling air temperature is relatively high. Therefore, in this case, the cooling capacity of the condenser can be secured, but the cooling performance of the radiator is insufficient and the cooling water temperature of the internal combustion engine is likely to rise, so that the internal combustion engine is likely to overheat.

When the radiator is enlarged and the core is thickened in order to prevent overheating of the internal combustion engine, it is necessary to increase the water capacity of the cooling water accordingly, which causes a problem that the weight of the vehicle increases significantly. The present invention has been made to solve such a problem, and has been devised in a layout configuration of a condenser for an air conditioner and a radiator for cooling an internal combustion engine, for a vehicle that is downsized and thinned without reducing the condenser capacity. An object of the present invention is to provide a cooling device for a water-cooled internal combustion engine.

[0005]

A cooling system for a water-cooled internal combustion engine for a vehicle according to the present invention for solving the above-mentioned problems is a vapor-compression-type vehicle equipped with a water-cooled internal combustion engine and a vapor-compression-type cooling device. A configuration including a condenser for a cooling device that constitutes a refrigeration cycle, an internal combustion engine cooling radiator arranged on the upstream side of cooling air of the condenser, and a cooling fan that allows the cooling air to pass through the condenser and the ventilation passage of the radiator. Have.

[0006]

According to the cooling system for a water-cooled internal combustion engine for a vehicle having the above-mentioned structure, since the condenser is arranged at the rear of the radiator, the condenser is not provided at the front of the radiator. Is directly introduced into the radiator, the cooling water temperature is effectively lowered, the cooling performance of the internal combustion engine is significantly improved, and the radiator can be downsized.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. A first embodiment in which a vehicle is equipped with a water-cooled internal combustion engine and a vapor compression cooling device will be described with reference to FIGS. First, FIG. 1 shows a schematic layout of the present embodiment, and FIGS. 2 and 3 show a concrete configuration of the present embodiment. As shown in FIGS. 1, 2, and 3, a radiator 10 that constitutes a part of a cooling water system of an internal combustion engine is mounted on a vehicle,
A condenser 20 that constitutes a part of a cooling device is arranged on the vehicle rear side of the radiator 10, and a cooling fan 30 that is supplied with electric power from an on-vehicle battery and is rotated by an electric motor 31 is provided on the vehicle rear side of the condenser 20. Has been.

The radiator 10 is composed of an upper tank 12, a core portion 16 and a lower tank 14, and a sprayer 22 is mounted on the vehicle front side of the condenser 20. The sprayer 22 is a sprayer that sprays the condensed water generated by the evaporator 44 onto one or both of the condenser 20 and the radiator 10. Shroud 3 forming a passage for the cooling air supplied by cooling fan 30
As shown in FIG. 3, 2 extends toward the vehicle front side so as to surround the periphery of the cooling fan 30. Shroud 3
The capacitor 20 is coupled and fixed to the middle portion 32a of the front extension portion of 2 by the bracket 24 and the bolt 26, and the upper tank 12 of the radiator 10 is coupled and fixed to the end portion 32b of the front extension portion of the shroud 32 by the bolt 17. The lower tank 14 is coupled and fixed by a bolt 18.

Next, the refrigerant circuit which constitutes the refrigeration cycle of the cooling device and the cooling device for the internal combustion engine will be described with reference to FIG. The refrigerant circuit 40 that constitutes the refrigeration cycle includes a condenser 20, a receiver 42, an evaporator 44, a compressor 46, an expansion valve 48, a temperature sensing cylinder 50 that controls the expansion valve 48, a refrigerant discharge pressure sensor 52, and an outlet temperature sensor 54. Composed.

The radiator 10 which constitutes one element of the cooling water system of the internal combustion engine includes a thermostat 72 and a water pump 74.
Is connected to the cooling water passage of the internal combustion engine main body 76 via a water temperature sensor 78, and a water temperature sensor 78 is provided in the middle of the cooling water passage.
A cooling fan 30 that sends cooling air to the radiator 10 and the condenser 20 is driven and controlled by an electric motor 31 that is controlled by receiving a command from an electronic control unit (ECU) 80.

The system for sending condensed water to the sprayer 22 includes a pump 60, a storage tank 62, a condensed water collector 64,
The storage tank 62 includes a water level sensor 66 and the like. And the radiator 10 which comprises the cooling system of an internal combustion engine is installed in the vehicle front side of the sprayer 22. The electronic control unit (ECU) 80 inputs signals generated by the refrigerant discharge pressure sensor 52, the blow-out temperature sensor 54, the water level sensor 66, the water temperature sensor 78, and other various internal combustion engine sensors as input signals, and a predetermined control program The driving signal of the compressor 46, the driving signal of the pump 60, the driving signal of the electric motor 31, and the like are output as output signals.

Next, the relationship between the running state of the vehicle and the capacity of the cooling device is as follows. When the internal combustion engine is started at a low temperature, the thermostat 72 is closed to raise the temperature of the cooling water, the radiator 10 does not radiate heat, and the cooling air having a relatively low temperature is supplied to the condenser 20. Therefore, when the cooling device is switched on, the capacity of the condenser 20 is sufficiently high, so that the capacity of the cooling device is fully exhibited.

Since the internal combustion engine is in a low-load operating state when the vehicle is traveling in a low-speed traffic jam, the radiator 10 radiates a small amount of heat and the temperature rise at the inlet of the condenser 20 is small. At this time, if the cooling device is switched on, the load of the cooling device is in a severe state for the internal combustion engine. However, in this case, similarly to the above, the air volume of the condenser 20 increases due to the increase of the air volume accompanying the miniaturization of the radiator 10, and the capacity of the condenser 20 is sufficiently secured.

When the vehicle is traveling at a low speed on an uphill slope, the cooling capacity of the internal combustion engine is the most severe because the speed of the vehicle is small in a medium and high load operation state. When the cooling device is operated in this state, the inlet air temperature of the condenser 20 rises and the discharge pressure of the compressor 46 rises. Since the rotation speed of the internal combustion engine is sufficiently high, the cooling capacity is sufficient and the compressor 46
Power consumption of will also increase. Since the output of the internal combustion engine is sufficiently large, the driving force of the compressor 46 is sufficiently high, so that the capacity of the cooling device is secured by the sufficient discharge pressure increase of the compressor.

According to the above embodiment, the radiator 10
Since the condenser 20 is arranged at the rear of the vehicle, the radiator 10 is controlled by the vehicle speed and the cooling fan 30.
Since the temperature of the cooling air taken in is set to the outside air temperature and the cooling performance of the radiator 10 is improved, the engine cooling performance can be significantly improved. Therefore, by reducing the core width and making the fin pitch coarse, it is possible to employ a radiator with low ventilation resistance and reduce the ventilation resistance of the vehicle. If the radiator 10 is downsized, the capacitor 20
The amount of air passing through is relatively increased, and the amount of air blown in the engine room where the internal combustion engine is mounted can be increased. By making the core portion 16 of the radiator 10 thin and making the fin pitch rough, it is possible to significantly reduce the weight including the water capacity. Further, the water temperature rising characteristic at the time of starting the internal combustion engine can be improved. By integrally forming the radiator 10, the condenser 20, and the cooling fan 30, the vehicle assembling process can be simplified and the space can be saved. Steering vibration can be reduced by increasing the mass as a dynamic damper by integrally forming the radiator 10, the condenser 20, and the cooling fan. The piping arrangement of the cooling device can be simplified. That is, in the conventional example, the condenser 20 is arranged on the vehicle front side of the radiator 10 as shown in FIG. 7, and therefore the piping of the cooling device is arranged on the vehicle front side of the condenser 20 due to the space of the mounting portion. The handling was complicated. On the other hand, in this embodiment, as shown in FIG. 1, since the condenser 20 is arranged on the rear side of the radiator 10, the piping of the cooling device can be simplified. By reducing the thickness of the radiator 10 and roughening the radiator fin pitch, the ventilation resistance in the engine room is reduced, the cooling air in the engine room is increased, and as a result, the temperature in the engine room can be lowered, and electronic device parts, etc. There is an effect that heat resistance measures can be easily taken.

Next, the operation of the sprayer 22 of this embodiment will be described. When the cooling device is operating, the condensed water generated in the evaporator 44 is collected by the condensed water collector 64, and the condensed water is stored in the storage tank 62. And the storage tank 62
The water level controls the amount of water sprayed from the sprayer 5 to the condenser 20 according to full water, intermediate water level, dry water, and the like. That is, (1) When the water is full, the pump 60 is activated when the cooling device is activated,
Water is sprayed onto the condenser 20 from the sprayer 22.

(2) At the intermediate water level, if the refrigerant discharge pressure sensor 52 has a high pressure set value, for example, 20 kg / cm ² or more, the pump 60 is operated to spray water from the sprayer 22 onto the condenser 20. (3) During dry water, the pump 60 is stopped and the spray of water from the sprayer 22 is stopped. By this sprayer control, not only the radiator 10 can be downsized but also the condenser 20 can be downsized, the cooling performance at the time of operation of the cooling device can be improved, the power consumption of the compressor 46 can be reduced, and the refrigerant discharge pressure can be reduced. A reduction in power consumption due to a reduction in the operating rate of the electric fan 31 can be expected.

Next, a second embodiment of the present invention is shown in FIG. In the second embodiment, the spray pipe 220 is attached to the vehicle front side of the condenser 20, and the fan shroud 320 is attached to the radiator 10.
It is an example extended to the front of. In this example, the fan shroud 320 has a duct function for effectively utilizing the cooling air and a function for mounting the condenser 20, and the radiator 10, the condenser 20 and the fan shroud 320 are integrated to save space. Further, all the components other than the condenser 20 constituting the system of the cooling device, for example, the compressor and the evaporator (neither of which is shown) are arranged at the vehicle rear side of the radiator 10, and the condenser 20 is arranged at the rear side of the radiator 10. To place
It becomes possible to simplify the arrangement of the piping of the system of the cooling device.

Next, a third embodiment of the present invention is shown in FIG. The third embodiment is an example in which a seal duct structure 100 and an intake duct 102 are added to the configuration of the first embodiment shown in FIG. The seal duct structure 100 includes a radiator 10
It is arranged between the condenser 20 and the condenser 20, and effectively replaces the capacity of the electric fan 31 that drives the cooling fan 30 with the air flow rate. The intake duct 102 is a duct that connects the radiator 10 and a vehicle front grill (not shown). This makes it possible to take in the low-temperature cooling air from the front of the vehicle at the outside temperature as it is with high efficiency, so that the cooling effect is further enhanced.

[0020]

As described above, according to the cooling system for a water-cooled internal combustion engine for a vehicle of the present invention, the condenser is arranged on the rear side of the radiator. Since low-temperature cooling air can be introduced as it is, the cooling capacity of the radiator is improved, and especially in operating conditions where the air flow rate is relatively low, such as during low-speed traffic congestion, the cooling performance of the internal combustion engine is increased and the capacity of the condenser is reduced. There is an effect that the cooling performance of the internal combustion engine can be improved without doing so. Furthermore, since the radiator can be made smaller and thinner, it is possible to reduce the water volume of the radiator, thereby reducing the weight and improving the rising characteristic of the internal combustion engine water temperature.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a first embodiment of the present invention.

FIG. 2 is a plan view showing a specific configuration of the first embodiment of the present invention.

3 is a sectional view taken along line III-III shown in FIG.

FIG. 4 is a circuit diagram showing a refrigerant circuit of a refrigeration cycle, an internal combustion engine cooling water circuit, and an electric control system according to a first embodiment of the present invention.

FIG. 5 is a schematic diagram showing a second embodiment of the present invention.

FIG. 6 is a sectional view showing a specific configuration of a third embodiment of the present invention.

FIG. 7 is a schematic diagram of a conventional example.

[Explanation of symbols]

 10 Radiator 20 Condenser 30 Cooling Fan 32 Shroud

Claims (1)

[Claims] 1. A vehicle equipped with a water-cooled internal combustion engine and a vapor compression type cooling device, wherein a condenser for a cooling device which constitutes a vapor compression type refrigeration cycle, and an internal combustion engine cooling arranged upstream of the cooling wind of the condenser. And a cooling fan that allows cooling air to pass through a ventilation passage of the condenser and the radiator, and a cooling device for a water-cooled internal combustion engine for a vehicle.