JPH0510125A - Cooling device of water cooling type engine for vehicle - Google Patents

Abstract

PURPOSE:To suppress rising of a cooling water temperature in operating environment in which the cooling water temperature of an engine is raised, resulting in generation of dangerous trend of overheating, and improve air conditioning performance in other operating environments. CONSTITUTION:Wind passes through an air blowing passage 1 by driving of cooling fans 14, 15. A radiator 2 is arranged upstream from a condenser 3 in the air blowing passage 1. In the radiator 2, heat is radiated from a first core part 12 or from first and second core parts 12, 13 by opening/closing an electromagnetic opening/closing valve 11 thus, resulting in possibility of changing a heat radiation area. The temperature of engine cooling water is detected by a water temperature sensor. When the water temperature detected by the water temperature sensor is lower than 100 deg.C, the electromagnetic opening/ closing valve 11 is closed by an ECU, and when the temperature exceeds 100 deg.C, the electromagnetic opening/closing valve 11 is opened thereby.

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 engine for a vehicle, and more particularly to a cooling system for a water-cooled engine in a vehicle equipped with a car air conditioner.

[0002]

2. Description of the Related Art Conventionally, in a vehicle equipped with an air conditioner for cooling a vehicle compartment, its condenser is installed in front of a radiator with respect to cooling air. Therefore, the radiator is cooled by the cooling air that has passed through the condenser.
When the air conditioner is operated, the high temperature refrigerant compressed by the compressor is introduced into the condenser, and the refrigerant is condensed and liquefied. Therefore, the cooling air from the vehicle running or the cooling fan is heated when passing through the condenser, and the radiator is cooled by the heated cooling air.

In addition, under conditions such as low-speed uphill driving in the summer, not only is the engine's heat generation large and sufficient vehicle speed air cannot be expected, but the engine speed is high, so the cooling capacity is also increased. The temperature of the cooling air introduced into the radiator greatly rises. For this reason, the temperature of the cooling water for the radiator rises. To keep the radiator cooling water temperature at an appropriate temperature, increase the size of the radiator,
Although the capacity of the cooling fan is being increased, it is difficult to increase the size of the cooling fan due to the limited space of the vehicle.

As a means for solving such a problem, for example, a radiator structure disclosed in Japanese Utility Model Laid-Open No. 62-74030 has been proposed. That is, the radiator is divided into two parts, which are arranged on both sides in front of the engine room. It is conceivable to arrange the condenser and the radiator separately on both sides in front of the engine room using this technique. In this case, the condenser and the radiator are arranged in parallel, the cooling performance of the radiator is not affected by the thermal state of the condenser, and the ventilation resistance is reduced, which is efficient for the cooling fan. ..

Further, in the radiator cooling structure disclosed in Japanese Patent Publication No. 58-47370, a suction hole for cooling air is provided in a portion which is in a negative pressure region in a traveling state in front of the vehicle body. A sub-radiator is placed in the vicinity. That is, the cooling air is guided to the sub radiator by the pressure difference between the ram pressure (running wind pressure) and the negative pressure area on the upper surface of the hood.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
If it is attempted to arrange the condenser and the radiator separately on both sides in the front of the engine room by utilizing the Japanese Patent Publication No.-74030, it is very difficult to realize it due to the space, in order to adapt it to a recent vehicle design or the like. In addition, Japanese special public Sho5
In the radiator cooling structure disclosed in Japanese Patent Laid-Open No. 8-47370, a sufficient cooling effect cannot be obtained in a region where the ram pressure (running wind pressure) cannot be expected (low speed region or vehicle stop region).

The present invention has been made in view of the above points, and can suppress the increase of the cooling water temperature in an operating environment where the cooling water temperature of the engine rises and there is a danger of overheating. An object of the present invention is to provide a cooling device for a water-cooled engine for a vehicle, which can improve the air conditioner performance in a driving environment.

[0008]

According to the present invention, there is provided an engine cooling radiator arranged upstream of a condenser constituting a refrigeration cycle for a car air conditioner in a ventilation passage, and a cooling fan for passing cooling air through the ventilation passage. When,
A heat radiation area adjusting actuator for adjusting the heat radiation area of the radiator, a heat load detecting means for detecting a heat load applied to the engine, and the heat radiation area adjusting actuator according to the heat load of the engine detected by the heat load detecting means. A cooling device for a water-cooled engine for a vehicle, which is equipped with a control means for controlling the heat radiation area of the radiator by controlling the above.

[0009]

The control means controls the heat radiation area adjusting actuator in accordance with the heat load of the engine detected by the heat load detecting means to adjust the heat radiation area of the radiator. Therefore, when the cooling water temperature rises under an extremely low frequency driving operation situation such as a low-speed climbing operation in the summer, it is possible to quickly avoid the overheat danger area by increasing the heat radiation area of the radiator. Also, under other operating conditions, the heat dissipation area of the radiator is made smaller, so that the capacitor is less susceptible to the thermal influence of the radiator.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a front bottom view of a passenger car. A ventilation passage 1 is formed on the front side of the vehicle, and the wind passes through the ventilation passage 1 as the vehicle travels. A radiator 2 is installed in the air passage 1, and a condenser 3 is installed downstream of the radiator 2 in the flow of cooling air in contact with the radiator 2 and overlapped by a distance L in the left-right direction. ..

FIG. 3 shows a rear view of the radiator 2. The radiator 2 includes a lower tank 4 and an upper tank 5 arranged in a horizontal direction, and a large number of tubes 6 extending in a vertical direction so as to connect the two, and the tubes 6 are provided with fins 7. A cooling water inlet pipe 8 is provided at the left end of the upper tank 5 in FIG. 3, and a cooling water outlet pipe 9 is provided at the right end of the lower tank 4. Then, when the engine cooling water is introduced from the cooling water inlet pipe 8, it flows downward from the upper tank 5 through the tube 6 and is discharged from the cooling water outlet pipe 9 through the lower tank 4. A radiator cap 10 is provided near the cooling water inlet pipe 8 in the upper tank 5.

Further, the upper tank 5 is provided with an electromagnetic opening / closing valve 11 as an actuator for adjusting a heat radiation area,
The tubes 6 and fins 7 on the left side of the electromagnetic opening / closing valve 11 in FIG. 3 are used as the first core portion 12, and the tubes 6 and fins 7 on the right side of the electromagnetic opening / closing valve 11 are used as the second core portion 13.
The second core portion 13 is an overlapping portion (distance L) with the capacitor 3 as shown in FIG. When the electromagnetic opening / closing valve 11 is closed, the cooling water entering from the cooling water inlet pipe 8 flows only in the first core portion 12. Also, the solenoid on-off valve 11
Is opened, cooling water is added to the first core portion 12 and the second core portion 1
3, and is discharged from the cooling water outlet pipe 9.

In FIG. 1, a cooling fan 14 is provided on the downstream side of the condenser 3 and the second core portion 13 of the radiator 2, and a cooling fan 15 is provided on the downstream side of the first core portion 12 of the radiator 2. ing.

The overlapping distance L between the radiator 2 and the condenser 3 is determined by the capacities of the condenser 3, the radiator 2 and the cooling fan 1415 and the ventilation resistance of the vehicle within the mounting space on the vehicle side.

The traveling wind from the front generated by the traveling of this vehicle and the cooling wind generated by the cooling fans 14 and 15 are the cooling wind F1 passing only through the condenser 3.
The second core portion 13 of the radiator 2, the cooling air F2 passing through the condenser 3, and the first core portion 12 of the radiator 2
It is divided into cooling air F3 that passes through only.

FIG. 2 shows the structure of the engine cooling water circulation path and the air conditioner mounted on this vehicle. The cooling water of the engine 16 is supplied to the first core portion 12 and the second core portion 13 of the radiator 2 by the pump 17, and is returned to the engine 16 again. In this case, when the electromagnetic opening / closing valve 11 is closed, the cooling water is not circulated in the second core portion 13,
Cooling water is circulated only in the first core portion 12. Further, the air conditioner mounted on this vehicle is provided with a compressor 18 for compressing a refrigerant, and the high temperature compressed refrigerant output from the compressor 18 is supplied to the condenser 3 and condensed. The output refrigerant from the condenser 3 is the receiver 19,
Further, the air supplied to the evaporator 21 via the expansion valve 20 is cooled to cool the air passing through the evaporator 21, and the cooling air is discharged into the vehicle interior. Then, the output refrigerant from the evaporator 21 is returned to the compressor 18. Here, expansion valve 2
The opening degree of 0 is controlled based on the detection signal from the sensor 22 that detects the pressure of the output refrigerant of the evaporator 21.

An electronic control unit (EC
Reference numeral 23, which is referred to as U, is composed of a microcomputer or the like and controls the cooling fans 14 and 15, the electromagnetic opening / closing valve 11, the compressor 18, and the like. A water temperature sensor 24 as a heat load detecting means is connected to the ECU 23, and the sensor 24 detects the temperature of engine cooling water.

Next, the operation of the cooling device for the water-cooled vehicle engine constructed as above will be described. The water temperature sensor 24 detects the cooling water temperature, and the detection signal is taken into the ECU 23. When the cooling water temperature is lower than the reference value (100 ° C.) by the signal, the ECU 23 closes the electromagnetic opening / closing valve 11. As a result, the engine cooling water flows only to the first core portion 12 of the radiator 2. Therefore, the cooling air F2 in FIG. 1 flows into the condenser 3 while maintaining the outside air temperature, and is not affected by the thermal effect of the radiator 2. Further, the ventilation resistance is low because there is a portion (cooling air F1) that does not pass through the radiator 2, the cooling air volume is large, and the air conditioner performance is improved.

Then, for example, in the case of low-speed climbing operation in the summer, the ECU 23 opens the electromagnetic opening / closing valve 11 when the cooling water temperature rises above the reference value (100 ° C.). As a result, the engine cooling water is cooled by both core portions 12 and 13 of the radiator 2. Therefore, it is possible to quickly avoid the danger zone of overheating. At this time, although the cooling performance of the condenser 3 is slightly lowered, an increase in the cooling air volume can be expected, and in such an operating condition, the engine speed is high, so the rotation speed of the compressor 18 is high and the cooling capacity has a margin. It does not deteriorate the vehicle interior environment.

As described above, in this embodiment, the cooling fan 1
Cooling air is passed through the blower passage 1 at 4, 15 and an engine cooling radiator 2 is arranged on the upstream side of the condenser 3 in the blower passage 1, and an electromagnetic opening / closing valve 11 (radiating area adjusting actuator is provided in the upper tank 5 of the radiator 2). ) Is provided, and the heat radiation area of the radiator 2 can be adjusted by switching between heat radiation of only the first core portion 12 and heat radiation by the first and second core portions 12 and 13. Furthermore, the water temperature sensor 2
4 (heat load detection means) is used to detect the engine cooling water temperature as a heat load applied to the engine.
3 (control means) closes the electromagnetic opening / closing valve 11 when the engine cooling water detected by the water temperature sensor 24 is lower than 100 ° C., and opens the electromagnetic opening / closing valve 11 when the engine cooling water is higher than 100 ° C. to dissipate the heat radiation area of the radiator 2. I changed it.

As a result, when the cooling water temperature rises under an extremely low frequency driving operation condition such as a low-speed climbing operation in the summer, the radiator 2 has a large heat radiation area to promptly move from the overheat danger zone. It can be avoided. At this time, the cooling performance of the condenser 3 is slightly lowered, but an increase in the cooling air flow due to the radiator 2 and the condenser 3 being arranged in a staggered manner can be expected, and in such an operating condition, the engine speed is also high and the cooling is high. Since the capacity is sufficient, it does not deteriorate the vehicle interior environment. Further, under other operating conditions, by reducing the heat radiation area of the radiator 2, the capacitor 3 becomes less susceptible to the thermal influence of the radiator 2.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the water temperature sensor 24 detects the heat load applied to the engine. The refrigerant pressure on the high pressure side and the on / off state of the compressor may be detected.

Further, in order to adjust the heat radiation area of the radiator, the electromagnetic opening / closing valve 11 is provided in the upper tank 5 in the above embodiment, but as another mode, the first radiator corresponding to the first core portion and the first radiator By connecting the second radiator corresponding to the two cores in parallel and controlling the opening and closing of the on-off valve, the case where only the first radiator is used and the first and second radiators are used.
You may make it switch to the case where a radiator is used.

Further, in the above embodiment, the radiator 2 and the condenser 3 are arranged in a horizontal direction in the ventilation passage 1 of the vehicle, but they may be arranged in a vertical direction.
Further, the cooling fans 14 and 15 may be arranged in front of the flow of the cooling air of the radiator 2.

Further, the radiator 2, the condenser 3,
The cooling fans 14 and 15 may be configured as shown in FIG. That is, the radiator 2 and the condenser 3 may be arranged so as to completely overlap the flow of the cooling air.
In this case, since the radiator 2 is arranged in front of the condenser 3, the temperature difference between the cooling air temperature and the engine cooling water (gas water temperature difference) is large, so that the core portion 1 of the radiator 2 is
It is possible to make the fin pitches 2 and 13 coarser,
It is possible to provide the same function as in the above embodiment.

[0026]

As described in detail above, according to the present invention,
It is possible to suppress the rise of the cooling water temperature in the operating environment where the engine cooling water temperature rises and there is a danger of overheating, and it is possible to improve the air conditioner performance in other operating environments. To do.

[Brief description of drawings]

FIG. 1 is a bottom view of a front side of a passenger car according to an embodiment.

FIG. 2 is a configuration diagram of a cooling water circuit and an air conditioner device of an embodiment.

FIG. 3 is a rear view of the radiator according to the embodiment.

FIG. 4 is a plan view of a radiator and a capacitor according to another example.

[Explanation of symbols]

1 Blower Passage 2 Engine Cooling Radiator 3 Condenser 11 Electromagnetic Open / Close Valve as Actuator for Adjusting Radiation Area 14 Cooling Fan 15 Cooling Fan 23 ECU as Control Means 24 Water Temperature Sensor as Heat Load Detection Means

Claims (1)

Claim: What is claimed is: 1. An engine cooling radiator that is arranged upstream of a condenser that constitutes a refrigeration cycle for a car air conditioner in a ventilation passage, and a cooling fan that allows cooling air to pass through the ventilation passage. A heat dissipation area adjusting actuator for adjusting the heat dissipation area of the radiator, a heat load detecting means for detecting a heat load applied to the engine, and the heat dissipation area adjusting actuator according to the heat load of the engine detected by the heat load detecting means. And a control means for adjusting the heat radiation area of the radiator by controlling the temperature of the radiator.