JPH03167032A - Cooler of water cooled internal combustion engine for vehicle - Google Patents

Abstract

PURPOSE:To improve the radiation performance of a radiator by disposing an air conditioning condenser in the forward inclined position to cover the nearly lower half portion of front face of the radiator and providing a damper opened and closed according to the travelling condition of a vehicle in an opening between the condenser and the lower portion of the radiator. CONSTITUTION:In disposing a condenser 6 in front of a radiator 3 in which engine cooling water is circulated, the lower portion 6a of the condenser 6 is faced to the front face of a vehicle and the upper portion 6b is disposed to face the nearly central portion of the front face of the radiator 3 under the forward inclined position to cover the nearly lower half of the front face of the radiator 3. Also, an under-cover 14 of the vehicle between the lower portion of the condenser 6 and the lower portion of the radiator 3 is formed with an opening 15 which can be opened and closed through connecting rods 20 or the like by dampers 17... with the operation of an actuator 16. The opening of these dampers 17 is controlled according to the travelling condition of the vehicle, so that the radiation capacity of the condenser is prevented from degradation while the radiation performance of the radiator is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a cooling device for a water-cooled internal combustion engine for a vehicle.

``Conventional technology'' In recent slant nose body vehicles, cooling air is introduced from an opening below the bumper to the radiator and the condenser that makes up the refrigeration cycle of the vehicle air conditioner W (hereinafter referred to as the air conditioner). . For this reason, as shown in FIG. 9, an uneven wind velocity distribution occurs in which the flow velocity of the cooling air is faster in the lower part than in the upper part of the radiator a and the condenser b, which adversely affects the cooling performance. Furthermore, as engines become more powerful and air conditioners are installed, engine compartments become overcrowded, increasing ventilation resistance, and even if the capacity of the cooling fan is reduced to -L, sufficient cooling air cannot be introduced. In particular, when driving at high load and at low speeds, when the cooling water temperature rises and exceeds a certain temperature because the cooling air is not sufficiently introduced depending on the vehicle speed during idling or the heat load of the radiator and condenser, the cooling air automatically responds to the signal from the water temperature sensor. In some cases, the air conditioner may be stopped and the air conditioner may not function properly.

For this reason, Utsukai Sho 6 3-1. 7 9 2 3 6, Utility Model Application No. 63-180424, Utility Model Application No. 1987-1959
Proposals have been made as disclosed in each publication No. 22.

``Problems to be Solved by the Invention'' However, the radiator cooling air intake device for an automobile disclosed in the above-mentioned Japanese Utility Model Application Publication No. 63-179236 is a device for adjusting the cooling air to the radiator. This cannot be an effective measure for vehicles equipped with air conditioners.

In addition, a cooling air introduction structure for an automobile disclosed in Japanese Utility Model Application Publication No. 63-195922 is provided with front opening/closing wings and rear opening/closing wings on undercovers before and after the radiator core, which can be opened/closed depending on driving conditions. The cooling air is increased to the radiator core, or the cooling air is introduced directly into the engine body without passing through the radiator core. Therefore, although it does not directly address the problem of introducing cooling air into vehicles equipped with air conditioners, since it is provided with front opening/closing wings and rear opening/closing wings, the structure is complicated and opening/closing control is also complicated.

Japanese Utility Model Application Publication No. 63-180424 discloses that on the front side of the radiator core, which is arranged downward toward the front of the vehicle body,
An automobile in which an air conditioning condenser is installed in a bonded manner to cover the core surface, an opening is formed on the bottom surface of the vehicle body at the rear of the radiator core, and a damper is provided to open the opening only when the wind is strong when the automobile is running. A radiator for use is disclosed. This automotive radiator has an air conditioning condenser installed in front of the radiator core, and since the cooling air is heated by the condensation heat of the air conditioner's refrigerant, the air-water temperature difference in the radiator becomes small, especially as mentioned above. During idling or high-load driving, an increase in cooling air due to driving cannot be expected, so the heat dissipation performance of the radiator cannot be fully demonstrated, which may result in problems such as air conditioner cut-off or overheating. There is a problem.

The present invention has been made to solve the above-mentioned problems3, and it maintains the capacitor capacity and improves the heat dissipation performance of the radiator in a car equipped with an air conditioner. The object of the present invention is to provide a cooling device for a water-cooled internal combustion engine for a vehicle that can control the following.

``Means for Solving the Problems'' As a specific means for achieving the above object, in a cooling system for a water-cooled internal combustion engine for vehicles in which a condenser for cabin air conditioning is placed in front of the radiator, the lower part is placed in front of the vehicle. A capacitor that is arranged in a forward-down position with its second part facing substantially the center of the front of the radiator to cover substantially the lower half of the front of the radiator, and a vehicle between the lower part of the capacitor and the lower part of the radiator. An opening formed in the undercover,
Cooling of a water-cooled internal combustion engine for a vehicle, comprising: a damper that opens and closes the opening to guide cooling air; and a control means that controls the opening degree of the damper depending on the running state of the vehicle. Equipment is provided.

``Function'' According to the cooling system for a water-cooled internal combustion engine for a vehicle, 4. The lower part of the condenser disposed at the front of the radiator faces the front of the vehicle, and the 2nd part faces approximately the center of the front of the radiator. In terms of posture, approximately half of the radiator is covered, reducing ventilation resistance in the engine room and increasing the amount of cooling air introduced into the engine room. The low-temperature cooling air is introduced directly into the top of the radiator, eliminating the uneven wind speed distribution of the cooling air passing through the radiator and improving the heat dissipation performance of the radiator. . In addition, the control means controls the opening degree of the damper according to the running condition of the vehicle, exhausts and introduces cooling air, adjusts the amount of cooling air passing through the condenser and radiator, and lowers the heat dissipation capacity of the condenser. Improve the heat dissipation performance of the radiator without causing any problems.

"Example" Embodiments of the present invention will be described based on the accompanying drawings.

FIG. 1 is a block diagram showing a schematic configuration of a cooling device for a water-cooled internal combustion engine for a vehicle according to the present invention.

In the figure, reference numeral 1 denotes an engine that is a water-cooled internal combustion engine for a vehicle, and a radiator 3 is disposed in front of a cooling fan 2 that is directly driven by the engine 1. Engine cooling water is circulated between the engine 1 and the radiator 3 by a water pump 1]. As is well known, the refrigeration cycle 4 of the air conditioner includes a compressor 5, a condenser 6, and a receiver 7.
, an extraction valve 8, an evaporator 9, etc., are connected by a refrigerant circulation path 10.

1] is a temperature sensing cylinder arranged in the refrigerant circulation path 10, and l2 is the refrigerant circulation path 1 connecting the compressor 5 and the condenser 6.
This is a pressure sensor installed inside the 0.

An electric fan 13 corresponding to the lower part of the capacitor 6 is installed in the capacitor 6 .

The capacitor 6 has its lower part 6a facing the front of the vehicle,
Before the upper part 6b faces approximately the center of the front of the radiator 3
It is placed in a tilted position and covers approximately the lower half of the front surface of the radiator 3. An opening 15 is formed in the vehicle undercover 14 between the lower part of the condenser 6 and the lower part of the radiator 3, and a damper 1 opens and closes the opening 15 using an actuator 16.
Place 7. The actuator 16 and damper 17 will be described in detail later.

Reference numeral 21 denotes an electronic control unit, which is composed of a microcomputer, memory, input/output interface (all not shown), etc., and detects the refrigerant pressure from the pressure sensor 2, the engine cooling water temperature from the water temperature sensor 22, and the air conditioner outlet temperature sensor 23. In addition to detecting and inputting the temperature of the conditioned air blown out from the air conditioner, the detection signals from the air conditioner ON/OFF sensor 24 and the vehicle speed sensor 25 are input, and the electric power of the capacitor 6 is controlled according to a predetermined control program. Fan 13 and actuator 1
outputs a control signal to control the operation of 6. Further, a power supply circuit 18 is connected to the electronic control units 1 and 21.

The device of this embodiment having the above structure is installed in the engine room 31 of the slant nose body 30, as shown in FIG. A bumper 32 is provided at the front end of the slant nose body 30, and an opening 34 for introducing cooling air is formed in a front grille 33 below the bumper 32.

FIG. 3 shows details of the damper 17. 3 dampers 1
7 is fixed to a lever 19 which is rotatably supported by a support shaft 18, respectively. The driving force of the actuator 16 is transmitted to each lever 19 by the connecting rod 20, and the reference position θ is determined by the control signal from the electronic/control unit 21.
. Rotation angle θ of the lever 19 from (omitted below)
, and θ, like 3B, the damper ]7 operates. At the rotation angle θ, each damper 17 is in an inclined position downward to the right as shown in FIG.
5 is closed, and at a rotation angle θ3, the damper 17 assumes a right-angled tilted position, which is opposite to the state shown in FIG.

FIG. 4 is a flowchart showing the control procedure of the electronic control unit 21 that controls the opening degree of the damper 17.

First, in step 100, the vehicle speed detected by the vehicle speed sensor 25 is compared with the set speed A (km/h),
If the speed is high, the actuator 16 is driven in step 102, the rotation angle θ of the lever 19 is set to θ - θ2, and the opening 15 is closed by the damper 17. If the vehicle speed is lower than the set speed, the engine cooling water temperature detected by the water temperature sensor 22 in step 104 is set to the set temperature B('C).
If the temperature is lower than that, the process proceeds to step 106, where the air conditioner ON/OFF sensor 24 determines whether or not the air conditioner is operating. If the air conditioner is not operating, the process advances to step 102. Also, step 106
If it is determined that the air conditioner is operating, in step 08, the air conditioner outlet temperature sensor 23 measures the temperature of the conditioned air blown out from the air conditioner and the set temperature c.
Compared with ('c), if the temperature of the conditioned air is low, the process proceeds to step 102.

If it is determined in step 108 that the temperature of the conditioned air blown out from the air conditioner is higher than the set temperature C ('C), the process proceeds to step 110 to drive the actuator 6 to change the rotation angle θ of the lever 19. Let θ=θ area. Further, in step 104, the engine cooling water temperature is set to the set overflow B (
If it is determined that it is higher than 'C), the process proceeds to step 112 and the rotation angle θ of the lever 19 is set to θ-θ3.

As mentioned above, when the rotation angle θ of the lever 19 is set to θ - θ2, (1) when the vehicle speed wind can be sufficiently utilized as cooling air, (2> when the vehicle speed wind cannot be used during idling or low speed driving) When the engine cooling water temperature is low and the air conditioner is not operating, and even when the air conditioner is operating, the temperature of the conditioned air blown out from the air conditioner is the set temperature C.
This is the case where it does not become higher than (“C).

In the case of (1) above, the vehicle speed wind is sufficiently utilized and the pressure in the engine room becomes considerably high, so the damper 17 is set horizontally and the opening 15 is closed to prevent the cooling air from flowing out. As a result, the cooling air introduced from the opening 33 of the front grill flows into the condenser 6 as shown in FIG.
The flow is divided into an upward flow along the condenser 6 in the forward-sloping position. The cooling air flowing upward along the condenser 6 is not heated by the condenser 6 and flows to the radiator 3.
flows into the upper part of the In this case, since the pressure loss due to the condenser 6 in the cooling air flow path is reduced to about half the apparent value, the amount of cooling air flowing into the engine room 3l increases accordingly. In this way, by increasing the total flow rate of cooling air and directly introducing low-temperature cooling air into the upper part of the radiator 3, uneven wind speed distribution between the upper and lower parts of the radiator 3 is eliminated, and the heat dissipation performance of the radiator 3 is improved. Can be done.

In the case of (2) above, the heat dissipation performance of the radiator 3 does not deteriorate and the air conditioner is not operating, or the heat dissipation capacity of the condenser 6 when the air conditioner is operating does not decrease, so the damper There is no need to actuate 17 to open opening 15.

When the rotation angle θ of the lever 19 is θ - θ, the above (
In case 2), the heat dissipation capacity of the condenser 6 is reduced and the cooling capacity of the air conditioner is reduced. Although the engine speed is low and the engine cooling water temperature is low as during idling, the cooling air cannot be obtained due to the vehicle speed, so the damper 17 is tilted downward to the right as shown in Fig. Open,
The cooling air that has passed through the condenser 6 is not directed to the radiator 3, but is immediately discharged from the opening 15 to the underfloor of the vehicle (see FIG. 6). By doing so, the ventilation resistance behind the capacitor 6 is reduced, the air volume of the electric fan 13 of the capacitor 6 is increased, and the heat dissipation ability of the capacitor 6 is improved. Therefore, the cooling capacity of the air conditioner is not affected.

In this case, the rotation speed of the electric fan l3 of the capacitor 6 may be increased by a control signal from the electronic control unit 21.

On the other hand, when the rotation angle θ of the lever 19 is set to θ-θ, the vehicle is running at a low speed, so wind cannot be sufficiently utilized, and the engine cooling water temperature is higher than the set temperature during high-load operation. In this case, the damper 17 is tilted upward to the right, opposite to that shown in FIG. 3, and the damper 17 is opened. 5 can be opened to introduce cooling air directly into the lower part of the radiator 3. Therefore, the amount of cooling air passing through the radiator 3 can be significantly increased, and since the cooling air is at a low temperature without passing through the condenser 6, the heat dissipation performance of the radiator 3 can be further improved. (See Figure 7).

In particular, since the engine speed is high and the cooling air volume is small, it is possible to prevent problems such as overheating during low-speed climbing where the engine cooling water temperature becomes high.

"Other Examples" FIG. 8 shows another embodiment of the invention.

The configuration of this embodiment is such that one damper 37 is operated by an actuator 36, and the opening degree of the damper 37 is varied between θ, ', and θ2 degrees depending on the driving condition.

The other configurations and operations of this embodiment are the same as those of the previous embodiment, so detailed explanations will be omitted.

In this embodiment, by using a single damper 37, the structure of the damper opening/closing mechanism can be simplified.

In the embodiment described above, the opening degree of the damper 17 or 37 is controlled in stages, but the actuator 16 is continuously controlled depending on the driving state of the vehicle based on detection signals from various sensors input to the electronic control unit 21. It is also possible to optimally control the opening degree of the tamper 17 or 37.

Further, the opening/closing mechanism of the damper 1.7.37 may have any structure as long as it can perform the functions described in the second embodiment, and is not limited to the structure of the embodiment.

Furthermore, instead of the engine-driven cooling fan of the above embodiment, an electric fan may be used.

``Effects of the Invention J'' The present invention has the configuration described above, and since the condenser is placed in a forward-down position and covers approximately the lower half of the front of the radiator, ventilation resistance in the engine room is reduced and The amount of cooling air introduced into the radiator is increased, and the cooling air is divided into two types: one that passes directly through the condenser and the bottom of the radiator, and the other that flows along the condenser and passes through the top of the radiator. By introducing this, it is possible to eliminate the uneven wind speed distribution of the cooling air passing through the radiator and improve the heat dissipation performance of the radiator. In addition, the control means controls the opening degree of the damper according to the running state of the vehicle, thereby introducing the cooling air into the exhaust chamber 1 and adjusting the amount of cooling air passing through the condenser and the radiator.
In addition to preventing a decrease in the heat dissipation capacity of the condenser, it also significantly improves the heat dissipation performance of the radiator, preventing overheating during idling or high-load low-speed driving, and a decrease in the cooling capacity of the air conditioner. It has excellent effects.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the present invention, with FIG. 1 being a block diagram showing the outline of the overall configuration, FIG. 2 being a cross-sectional view showing the arrangement of the device of this embodiment, and FIG. A partial sectional view showing the details of the damper, Figure 4 is a flowchart 1 to 1 showing the control procedure for the damper opening, and Figures 5 to 7 are flowcharts of cooling air according to the damper opening. 8 is a sectional view showing another embodiment, and FIG. 9 is a sectional view showing the flow of cooling air in a conventional example. l'J l,. , engine, 2. ．． ．． cooling fan, 3. ．． ．．
Radiator, 4. ．． ．． Refrigeration cycle, 6. ．． ．． Capacitor, 6 a. ．． ．． lower part, 6b. ．． Upper part, 1
3. ．． Electric fan, 14. ．． ．． ．． Vehicle undercover 15. ．． Opening, 16. ．． actuator,
17. ．． ．． Damper, 2 1. ．． ．． Electronic control unit.

Claims (1)

[Scope of Claims] A cooling system for a water-cooled internal combustion engine for a vehicle in which a condenser for cabin air conditioning is placed in front of the radiator, with the lower part facing the front of the vehicle and the upper part facing approximately the center of the front of the radiator. a condenser arranged in a posture such that the condenser covers substantially the lower half of the front of the radiator; an opening formed in the vehicle undercover between the lower part of the condenser and the lower part of the radiator; 1. A cooling device for a water-cooled internal combustion engine for a vehicle, comprising: a damper that provides guidance; and a control means that controls the opening degree of the damper depending on the running state of the vehicle.