JPH0976722A - Cooling fan control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently perform interior cooling, in a cooling fan control device constituted so that when the high pressure side pressure of a refrigerating cycle is higher than fixed pressure, a cooling fan is driven to send air to a condenser and lower the high pressure. SOLUTION: Necessary blow-down temperature TAO blown in a car room is computed by an air-conditioner control device 15, based on respective information from an inside air temperature sensor 18, an outside air temperature sensor 19, a solar radiation sensor 20, and a temperature setter 21. When a cooling fan control device 14 judges the necessity of quick cooling in the car room based on this TAO, it makes forcedly the fan levels of a first cooling fan 10 and a second cooling fan 11 to be Hi, even when the high pressure side pressure of a refrigerating cycle 1 is under fixed pressure, and even when water temperature is under fixed temperature. Air is hereby, sufficiently sent to a condenser 3, low pressure is sufficiently lowered, and hence cooling in the car room is sufficiently performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling fan configured to lower a high pressure of a refrigeration cycle by driving the cooling fan to blow the air to a condenser when the high pressure is higher than a predetermined pressure. Regarding the control device.

[0002]

2. Description of the Related Art Conventionally, when the high pressure of the refrigeration cycle exceeds a predetermined pressure, the cooling fan for blowing air to the condenser is set to the maximum level, and when the high pressure falls below the predetermined pressure, the cooling fan There is known a cooling fan control device that controls the high pressure within an optimum range by repeating the control of lowering the level.

[0003]

In the above conventional cooling fan control device, after the refrigeration cycle is started, the high pressure becomes equal to or higher than the predetermined pressure, the cooling fan is rotated at the maximum level, and the high pressure is set to the predetermined pressure. When lowering the cooling fan level below, it is possible that the low pressure has not yet fallen sufficiently at this point.

By the way, the fact that the low pressure is not sufficiently lowered as described above means that when the cooling air from the evaporator is blown into the room for indoor cooling,
This means that this indoor cooling cannot be performed sufficiently. That is, when the indoor temperature is very high as in the summer, it takes a very long time for the indoor temperature to reach the desired temperature.

Therefore, the low pressure must be lowered in order to perform sufficient indoor cooling, but for that purpose, the amount of air blown to the condenser must be increased as much as possible. However, in the case of the above conventional cooling fan control device, as described above, even though the low pressure is not sufficiently lowered, the level of the cooling fan may already be lowered. There is a problem that indoor cooling cannot be performed.

Therefore, in view of the above problems, the present invention is configured such that, when the high pressure of the refrigeration cycle is equal to or higher than a predetermined pressure, the cooling fan is driven to blow the air to the condenser to lower the high pressure. An object of the present invention is to allow a fan control device to sufficiently perform indoor cooling.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, claims 1 to 4 are provided.
In the invention described, when the high-pressure pressure of the refrigeration cycle is equal to or higher than a predetermined pressure, the amount of air blown by the cooling fan is set as a first air-blowing amount, and when the high-pressure pressure is equal to or lower than the predetermined pressure, In the cooling fan control device that sets the second air flow rate smaller than the first air flow rate, it is determined whether or not the indoor rapid cooling needs to be performed based on the physical quantity related to the deviation between the desired indoor temperature and the indoor temperature, When it is determined that it is necessary, the amount of air blown by the cooling fan is set to the first amount of air blow.

According to this, when it is necessary to perform indoor rapid cooling, the above-mentioned air flow rate becomes the first air flow rate, that is, the air flow rate when the high pressure is above the predetermined pressure, so that sufficient air flow to the condenser is achieved. Done. Therefore, the low pressure can be sufficiently reduced, and as a result, indoor cooling can be sufficiently performed.

[0009]

1 is a block diagram of an embodiment in which the present invention is applied as a cooling fan control device for an automobile.
It will be described based on First, the overall configuration of this embodiment will be described with reference to FIG. In FIG. 1, a refrigeration cycle 1 includes a compressor 2 that compresses the refrigerant in the refrigeration cycle 1 and a condenser 3 that condenses the refrigerant from the compressor 2.
And a receiver 4 that separates the refrigerant from the condenser 3 into gas and liquid and flows out only the liquid refrigerant, an expansion valve 5 that decompresses and expands the liquid refrigerant from the receiver 4, and the refrigerant from the expansion valve 5 is evaporated. It is configured by connecting the evaporator 6 with the refrigerant pipe 7.

Of these, an electromagnetic clutch 8 is connected to the compressor 2, and when the electromagnetic clutch 8 is on, the power of an engine (not shown) is transmitted to the compressor 2 so that the compressor 2 operates. When driven and the electromagnetic clutch 8 is off, the power transmission of the engine to the compressor 2 is cut off, and the compressor 2 is stopped. The evaporator 6 is arranged in an air conditioning case (not shown) that guides the inside air or the outside air into the vehicle compartment. In the air conditioning case, a fan (not shown) is provided upstream of the evaporator 6 in the air, and a heater and an air mix door (not shown) are provided downstream of the evaporator 6 in the air. The downstream end is formed with a face outlet that blows the conditioned air to the upper half of the passenger in the passenger compartment, a foot outlet that blows to the passenger's feet, and a defroster outlet that blows to the inner surface of the windshield.

Reference numeral 9 denotes a radiator which radiates the cooling water of the engine, and like the condenser 3, is provided in the front portion of the vehicle so that the vehicle traveling wind is well hit. The radiator 9 is provided directly downstream of the traveling wind of the condenser 3. Both 10 and 11 are a first cooling fan and a second cooling fan that blow air to both the condenser 3 and the radiator 9, and the first cooling fan 10 is electrically driven by a first electric motor 12, The second cooling fan 11 is electrically driven by the second electric motor 13.

Both the cooling fan control device 14 and the air conditioner control device 15 include a CPU, ROM, RA (not shown).
The control device includes a well-known microcomputer including M, an input / output port, and the like. Then, both of these control devices 14 and 15 are supplied with power from a battery (not shown) when an ignition switch (not shown) of the engine is turned on.

Of these, the cooling fan control device 14 is
Information from the high pressure sensor 16 that detects the high pressure of the refrigeration cycle 1, a water temperature sensor 17 that detects the engine cooling water temperature
Information from an electromagnetic clutch relay (not shown) that is turned on / off according to the on / off state of the electromagnetic clutch 8.
And the information from the air conditioner controller 15 is input.
Then, the calculation of the rotation levels of the first and second cooling fans 10 and 11 is performed based on these pieces of information, and the electric motors 12 and 13 are controlled based on the calculation results.

Further, the air conditioner control device 15 detects the information from the inside air temperature sensor 18 for detecting the temperature inside the vehicle, the information from the outside air temperature sensor 19 for detecting the outside air temperature, and the amount of solar radiation applied to the inside of the vehicle. Information from the solar radiation sensor 20,
Further, information from the temperature setter 21 for the passenger in the passenger compartment to set the desired passenger compartment temperature is input. Then, on the basis of these pieces of information, the required blowout temperature (hereinafter, T
AO) and other control amounts are calculated, TAO is output to the cooling fan control device 14, and other control amounts are output to the electromagnetic clutch 8 and other air conditioning means.

The control process performed by the microcomputer of the air conditioner control device 15 will be described with reference to FIG. 2, and the control process performed by the microcomputer of the cooling fan control device 14 will be described with reference to FIG. Note that the routines of FIGS. 2 and 3 are started when the ignition switch is turned on and power is supplied to the control devices 14 and 15.

The control process by the air conditioner controller 15 will be described. First, in step 201 of FIG. 2, the inside air temperature (Tr) detected by the inside air temperature sensor 18 and the outside air temperature sensor 1 are detected.
The ambient temperature (Tam) detected by 9 and the solar radiation amount (Ts) detected by the solar radiation sensor 20 and the desired temperature (Tset) set by the temperature setter 21 are read. Then, in the next step 202, TAO is calculated by substituting each information read in the above step 201 into the following formula 1 stored in the ROM in advance.

[0017]

## EQU1 ## TAO = Kset × Tset−Kr × Tr−Kam ×
Tam-Ks * Ts-C Here, Kset, Kr, Kam, and Ks are each a correction gain, and C is a correction constant. Then, in the next step 203, the TA calculated in the above step 202
O is output to the cooling fan control device 14. Then return.

As described above, the air conditioner control device 15 calculates the other control amount based on another routine (not shown) and outputs the control amount to the electromagnetic clutch 8 and other air conditioning means. Next, the control processing by the cooling fan control device 14 will be described. First, at step 301, the high pressure (P) detected by the high pressure sensor 16, the water temperature (TW) detected by the water temperature sensor 17, and the electromagnetic clutch relay are used. Read information (COMP). Then, in the next step 302, the TAO output by the air conditioner controller 15 is read.

Then, in the next step 303, the information read in the above steps 301 and 302 and RO
Based on the maps of FIGS. 4 to 7 stored in M, the parameter f (P) for the high pressure, the parameter f (TW) for the water temperature, the parameter f (COMP) for the ON / OFF state of the compressor 2 , And TAO with respect to the parameter f (TAO).

Then, in the next step 304, it is determined whether or not the compressor 2 is on, based on the parameter f (COMP). If it is determined that the compressor 2 is on, that is, f (COMP) = 1, then in the next step 305, the parameter f (TA
Based on O), it is determined whether or not it is necessary to perform rapid cooling of the vehicle interior.

If it is determined that the rapid cooling is required, that is, f (TAO) = 1, then the following step 3
At 06, the first cooling fan 10 and the second cooling fan 1
The Hi voltage is applied to the first electric motor 12 and the second electric motor 13 so that the fan level of 1 is Hi (maximum rotation). As a result, sufficient air is blown to the condenser 3, and the low pressure can be reduced sufficiently, and as a result,
The indoor cooling can be sufficiently performed.

If it is determined in step 305 that rapid cooling is not required, that is, f (TAO) = 0, then in step 307 the parameter f
Based on (P), it is determined whether the high pressure of the refrigeration cycle 1 is equal to or higher than a predetermined pressure. If it is determined that the high pressure is equal to or higher than the predetermined pressure, that is, f (P) = 1, the high pressure needs to be immediately reduced, and thus the control of step 306 is performed.

On the contrary, when it is determined in step 307 that the high pressure is equal to or lower than the predetermined pressure, that is, f (P) = 0, both the fan levels of the first and second cooling fans 10 and 11 are set to Hi. Step 30
At 9 or 310, the fan level of one of them (the first cooling fan 10 in the present embodiment) is lowered to Lo.

At this time, in step 308, it is determined based on the parameter f (TW) whether the water temperature is equal to or higher than a predetermined temperature. Then, when it is determined in step 308 that the water temperature is equal to or higher than the predetermined temperature, that is, f (TW) = 1, the water temperature must be immediately reduced. Therefore, in step 309, the second cooling fan 11 is operated. If the water temperature is below the predetermined temperature, that is, f (TW) = 0 is determined in step 308, the fan level of the second cooling fan 11 is set to Lo in step 310.

On the other hand, when it is determined in step 304 that the compressor 2 is off, that is, f (COMP) = 0, the refrigeration cycle 1 is not operating and therefore the condenser 3 is cooled. Since it is not necessary, the fan level of the first cooling fan 10 is turned off in step 312 or 313. At this time, step 311
It is determined whether or not the water temperature is equal to or higher than the predetermined temperature. If it is determined to be the predetermined temperature or higher, the fan level of the second cooling fan is set to Hi in step 312, and if it is determined to be the predetermined temperature or lower, In step 313, the fan level of the second cooling fan is turned off.

As described above, in the present embodiment,
Even if the high pressure is equal to or lower than a predetermined pressure or the water temperature is equal to or lower than a predetermined temperature, when the TAO is equal to or lower than the predetermined temperature, that is, when the vehicle interior needs to be rapidly cooled, the first cooling fan 10 and the second cooling fan 10 Since the fan level of the cooling fan 11 is forcibly set to Hi, air is sufficiently blown to the condenser 3, and as a result, the low pressure is sufficiently reduced, so that the evaporator 6 can be sufficiently cooled in the vehicle interior. it can.

(Modification) In the above-mentioned embodiment, TAO is calculated as a physical quantity related to the change of the desired temperature (Tset) in the passenger compartment and the internal air temperature (Tr), but this deviation (Tset)
-Tr) itself may be calculated as the physical quantity. Further, although two cooling fans are provided in the above embodiment,
Only one is acceptable.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram according to an embodiment of the present invention.

FIG. 2 is an air conditioner control device 15 in the above embodiment.
4 is a flowchart showing a flow of control processing by the.

FIG. 3 is a cooling fan control device 1 according to the above embodiment.
4 is a flowchart showing a flow of control processing according to No. 4.

FIG. 4 is a map showing the relationship between the high pressure and its parameter f (P) in the above embodiment.

FIG. 5 is a map showing the relationship between water temperature and its parameter f (TW) in the above embodiment.

FIG. 6 is a map showing a relationship between a compressor ON / OFF state and its parameter f (COMP) in the above embodiment.

FIG. 7 is a diagram showing the required outlet temperature (TA
It is a map showing the relationship between O) and its parameter f (TAO).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Refrigeration cycle, 2 ... Compressor, 3 ... Condenser, 4 ... Receiver, 5 ... Expansion valve (pressure reducing means), 6 ... Evaporator, 7 ... Refrigerant piping, 8 ... Electromagnetic clutch, 9 ... Radiator, 10 ... No. 1
Cooling fan (cooling fan), 11 ... Second cooling fan, 1
2 ... 1st electric motor, 13 ... 2nd electric motor, 14 ... Cooling fan control device, 15 ... Air conditioner control device, 16 ... High pressure sensor, 17 ... Water temperature sensor, 18 ... Inside air temperature sensor (indoor temperature detection means), 19 ... outside air temperature sensor, 20 ... solar radiation sensor, 21 ... temperature setting device.

Claims (4)

[Claims] 1. A condenser (3) constituting a refrigeration cycle (1) together with a compressor (2), a pressure reducing means (5) and an evaporator (6), and cooling for blowing air to the condenser (3). Fan (10)
And a fan driving means (1) for driving the cooling fan (10).
2) and is configured to cool the room by the evaporator (6), and when the high pressure of the refrigeration cycle (1) is equal to or higher than a predetermined pressure, the cooling fan (10) is used. Controlling the fan drive means (12) so that the air flow rate becomes the first air flow rate,
When the high-pressure pressure is equal to or lower than the predetermined pressure, the fan driving unit (1) controls the cooling fan (10) so that the blowing amount becomes a second blowing amount smaller than the first blowing amount.
In a cooling fan control device configured to control 2), an air conditioning driver sets a desired indoor temperature by a temperature setting means (2
1), an indoor temperature degree detecting means (18) for detecting an indoor temperature, a desired temperature set by the temperature setting means (21), and an indoor temperature detected by the indoor temperature detecting means (18). Physical quantity calculating means (step 202) for calculating a physical quantity related to the deviation, and rapid cooling determination for judging whether or not it is necessary to perform indoor rapid cooling based on the physical quantity calculated by this physical quantity calculating means (step 202) When it is determined by the means (step 305) and the rapid cooling determination means (step 305) that the indoor rapid cooling needs to be performed, the amount of air blown by the cooling fan (10) becomes the first amount of air blown. And a fan control means (step 306) for controlling the fan drive means (12). 2. The physical quantity calculation means (step 202)
Is a required blowout temperature calculating means (step 202) for calculating a required blowout temperature into the room based on at least the deviation, and the rapid cooling determination means (step 305) is the required blowout temperature calculating means (step 202). The cooling fan control device according to claim 1, wherein the cooling fan control device is configured to determine whether or not the required blowout temperature calculated by (1) is equal to or lower than a predetermined low temperature. 3. A refrigeration cycle operating state determination means (step 304) for determining whether the refrigeration cycle (1) is operating, and the fan control means (step 306) determines the refrigeration cycle operating state determination. Means (step 304)
When it is determined that the refrigeration cycle (1) is operating and the rapid cooling determination means (step 305) determines that the indoor rapid cooling needs to be performed, the cooling fan (10) is used. The cooling fan control device according to claim 1 or 2, characterized in that the fan drive means (12) is controlled so that the air flow rate becomes the first air flow rate. 4. A cooling fan control device for a vehicle, wherein the cooling fan control device according to any one of claims 1 to 3 is used for a vehicle, and a radiator (9) for radiating engine cooling water of the vehicle is provided. The cooling fan control device for a vehicle, wherein the cooling fan (10) is arranged at a position for blowing air to both the condenser (3) and the radiator (9).