JP3111482B2 - Vehicle air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle for performing air volume correction at the time of economy control in which a target evaporator outlet temperature of an evaporator provided in a refrigeration cycle is equal to a target outlet temperature at an outlet. The present invention relates to an air conditioner.

[0002]

2. Description of the Related Art Conventionally, in a system for controlling an evaporator outlet temperature (TE) to a target evaporator outlet temperature (TEO) by using a compressor that varies a refrigerant amount supplied to an evaporator, When the heat load on the evaporator is small, that is, when the heat exchange with the air does not need to be much, so-called economy control in which the target evaporator outlet temperature (TEO) is increased to reduce the power consumption of the compressor. It is known to do.

In carrying out this economy control,
It is desirable that the target evaporator outlet temperature (TEO) is equal to the target outlet temperature (TAO) at the outlet (TAO = TEO), and the reheat amount is zero with no heating by the heater core. . That is, when the refill amount is not 0, the evaporator moves the air to the target outlet temperature (TA).
O) It is desired to avoid such a problem because the compressor is excessively cooled down to the point where the excess power is consumed.

Here, the evaporator has only a cooling function, and the air immediately after passing through the evaporator cannot be made higher than the evaporator intake air temperature (TEF) before passing through the evaporator. Evaporator intake air temperature (TEF) ≥ target evaporator outlet temperature (TE
O). Therefore, when the target outlet temperature (TAO) is higher than the evaporator intake air temperature (TEF), that is, when TAO> TEF, TAO> TEF ≧ TEO, so that TAO> TEO. TAO = TEO
Does not.

Therefore, as a first method in the prior art of economy control, when the target outlet temperature (TAO) is equal to or lower than the evaporator intake air temperature (TEF), that is, TA
When O ≦ TEF, TAO = TEO and the refill amount is 0
There is a method of making the economy control state.

However, in such an economy control state, if the target outlet temperature (TAO) drops rapidly due to a sudden change in the amount of solar radiation, the target evaporator outlet temperature (TEO) also drops sharply because TAO = TEO. But the actual evaporator
Since the outlet temperature (TE) does not drop suddenly, a response time delay occurs until TEO = TE. When this response time delay occurs, there is a drawback that the occupant cannot obtain a good feeling because the blowing at the target blowing temperature is not performed during the response time delay.

In order to avoid the above drawback, there is a second method in which air is allowed to slightly flow through the heater core so that a certain amount of retentate is provided.

According to this method, the target outlet temperature (TA)
O) drops rapidly and the target evaporator outlet temperature (TEO)
When the temperature suddenly drops, the amount of warm air after passing through the heater core or the temperature is reduced by adjusting the opening of the air mix damper or the amount of engine cooling water inside the heater core. Can be prevented.

However, this method has a drawback that the evaporator needs to cool down the air as much as the air is passed through the heater core and heated, so that the compressor needs to use extra power.

[0010]

SUMMARY OF THE INVENTION Therefore, the present invention is basically constructed based on the first method described above, and
It is an object of the present invention to provide a vehicle capable of solving the problem of response time delay, and to realize economy control with a substantially zero refueling amount while maintaining a good occupant feel.

[0011]

The means for solving the above problems will be described below with reference to FIG. In order to achieve the above object, the present invention is provided in the air conditioner unit so as to take air into the air conditioner unit from inside and outside of the vehicle and to blow the air from the outlet toward the vehicle room. A blower 1, an evaporator 2 provided in the air conditioner unit for cooling the air in the air conditioner unit, a compressor 3 for supplying a refrigerant to the evaporator 2, and at least a vehicle room temperature and an evaporator outlet. A sensor 4 for detecting a temperature (TE), a vehicle room temperature setting device 5 for setting a set temperature in the vehicle cabin, and connected to the sensor 4 and the vehicle room temperature setting device 5 for controlling the blower 1 and the compressor 3 A control device 60 for supplying a control output, blower driving means 7 for driving the blower 1 based on the control output from the control device 60,
Compressor drive control means for driving the compressor 3 based on the control output from the control device 60, wherein the control device 60 controls the blower based on control outputs from the sensor 4 and the vehicle room temperature setting device 5. A target outlet temperature calculator 61 for calculating a target outlet temperature (TAO) at the outlet; and a target evaporator outlet temperature (TEO) based on the value of the target outlet temperature (TAO). A target evaporator outlet temperature calculating means 62 for setting the target evaporator outlet temperature (TEO) and the target outlet temperature (TAO) to have an equal region;
The value of the target evaporator outlet temperature (TEO) and the evaporator outlet temperature (TE) detected by the sensor 4
In order to control the evaporator outlet temperature (TE) based on the value of the evaporator outlet temperature control means 63 for providing the control output to the compressor drive control means, and the value of the target outlet temperature (TAO) The blower 1 based on
Means for calculating the air flow level of the target evaporator, and the value of the target evaporator air outlet temperature (TEO) and the target air outlet temperature (TEO) when the target evaporator air outlet temperature (TEO) is equal to the target air outlet temperature (TAO). Evaporator outlet temperature (T
E) providing the control output to the blower driving means 7 based on the airflow level and the airflow correction value, based on the airflow correction value calculation means 65 for calculating the airflow correction value of the blower 1 based on the value of E). Evaporator outlet temperature (TEO)
The gist of the invention is a vehicle air conditioner including a blower air volume control means 66 for increasing the air volume as the difference between the air temperature and the evaporator air outlet temperature (TE) becomes larger.

[0012]

[Effect] Conventionally, target evaporator outlet temperature (TEO)
As mentioned earlier, a response time delay occurs until the temperature reaches the evaporator blowing temperature (TE). Since the occupant feels discomfort due to the delay in response time, in order to eliminate the discomfort, first, an air volume correction value calculation is performed in accordance with a difference between the target evaporator outlet temperature (TEO) and the evaporator outlet temperature (TE). Means (65) calculates an air volume correction value. That is, when the difference between the target evaporator outlet temperature (TEO) and the evaporator outlet temperature (TE) is large, the air volume correction value calculation means (65) also makes a large air volume correction, and the target evaporator outlet temperature (TEO). ) And the evaporator outlet temperature (TE) are small, the air volume correction value calculating means (65) also corrects the air volume to a small extent.

The air volume correction value and the air volume calculating means (64)
The blower air volume control means (66) controls the air volume of the blower (1) based on the value of the air volume level calculated by (1).
In other words, the blower air volume control means (66) sets the target evaporator
Outlet temperature (TEO) and evaporator outlet temperature (TE)
Is large, the airflow of the blower (1) is controlled to be larger, and if the deviation between TEO and TE is small, the airflow of the blower (1) is controlled to be smaller. Then, the blower driving means (7) drives the blower (1) based on the output signal from the blower air volume control means (66).

As described above, when a deviation occurs between the target evaporator outlet temperature (TEO) and the evaporator outlet temperature (TE), the air volume of the blower (1) is changed according to the magnitude of the difference. By increasing or decreasing, it is possible to eliminate the discomfort caused to the occupant due to the response time delay.

[0015]

As described above, according to the present invention, it is possible to compensate for the delay in response time, which deteriorates the occupant's feeling, by increasing the airflow, so that economy control can be performed with good performance. it can. In particular, in the summer, in a state of sweating, such as after opening the window for a moment, if the air volume is increased, the feeling to the occupant can be improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. First, the configuration of one embodiment of the present invention will be described with reference to FIG. FIG. 2 is an overall configuration diagram showing the configuration of one embodiment of the present invention.

In FIG. 2, the air conditioner unit 9 is disposed in the engine room behind the instrument panel. The blower 1 is arranged at the most windward side in the air conditioner unit 9 and introduces air into the air conditioner unit 9 from the inside air inlet 10 or the outside air inlet 11. Whether the inside air or the outside air is introduced is determined by the inside / outside air switching damper 12.
Activate to select.

The evaporator 2 is arranged on the leeward side of the blower 1, and exchanges heat between the refrigerant in the evaporator 2 and the air around the evaporator 2, thereby cooling the air in the air conditioner unit 9. .

The heater core 13 is disposed on the leeward side of the evaporator 2 and in the lower half of the air conditioner unit 9 in the drawing.
The air is heated using the engine cooling water as a heat source. By adjusting the opening of the air mix damper 14,
The amount of air flowing through the heater core 13 is adjusted, and the temperature of the conditioned air blown into the vehicle interior is adjusted.

The first mode switching damper 15 and the second mode
The mode switching damper 16 is disposed at the most leeward position in the air conditioner unit 9, the first mode switching damper 15 regulates the amount of conditioned air blown toward the upper body of the occupant, and the second mode switching damper 16 Adjust the amount of conditioned air that blows out toward the occupant's feet.

Having described the inside of the air conditioner unit, the refrigeration cycle will now be described. Evapore
As described above, the heater 2 exchanges heat between the refrigerant in the evaporator 2 and the air in the air conditioner unit 9 to cool the air.

The external variable displacement compressor 3 heats and evaporates the refrigerant while flowing through the evaporator 2 to a high temperature and high pressure state. The external variable displacement compressor 3 is the compressor according to the present invention.

The magnet clutch 18 receives a signal from the magnet clutch drive circuit 8 and transmits engine power to the external variable displacement compressor 3. For example, when the magnet clutch 18 is turned on, the engine power is transmitted to the external variable displacement compressor 3 as it is, and when the magnet clutch 18 is turned off, the external variable displacement compressor 3 is turned off.
Also becomes zero. The compressor drive control means of the present invention includes a magnet clutch 18, a magnet clutch drive circuit 8, and the next control valve 17 and control valve drive circuit 6.
It is composed of

The control valve 17 receives a signal from the control valve drive circuit 6, changes the capacity of the external variable capacity compressor 3, and changes the capacity to adjust the amount of refrigerant flowing through the refrigeration cycle. Adjusting the heat exchange amount in the heater 2;

The condenser 19 condenses the refrigerant brought into a high temperature and high pressure state by the external variable capacity compressor 3 under a constant pressure, cools it, and liquefies it. The receiver 20 is
When the capacity inside the external variable displacement compressor 3 changes and the amount of the refrigerant changes, the refrigerant is temporarily stored. The receiver 20 removes moisture and dust in the refrigeration cycle.

The expansion valve 21 reduces the pressure of the refrigerant, which has been brought into a low-temperature and high-pressure state by the condenser 19, to a gas-liquid two-phase state while keeping the temperature constant, and the evaporator 2 exchanges heat between the refrigerant and air. Make it easy to use.

Next, another configuration will be described. Sensor 4
Is a detecting device for detecting a vehicle room temperature, an outside air temperature, a solar radiation amount, an engine cooling water temperature, and an evaporator outlet temperature (TE).

The switch 5 constituting the vehicle room temperature setting device is an input device for the occupant to determine and input the temperature of the vehicle interior. The A / D converter 22 is a converter that converts an analog signal output from the sensor 4 and the vehicle temperature setting switch 5 into a digital signal.

The microcomputer 60 is a control device according to the present invention, and includes the sensor 4 and the vehicle temperature setting switch 5.
, And based on the signal, a digital operation process is executed in accordance with a predetermined room temperature control program. The control output is output to the blower drive circuit 7, the magnet clutch drive circuit 8, the control valve drive circuit 6, the air mix damper drive circuit 23, and the mode switching damper drive circuit 24.

The blower drive circuit 7 is the blower drive means of the present invention, and rotates or stops the blower 1 based on a control output from the microcomputer 60. Based on the control output from the microcomputer 60, the magnet clutch drive circuit 8 turns on the magnet clutch 18 to transmit the engine power to the compressor 3 and turns off the magnet clutch 18 to reduce the power consumed by the compressor 3 to zero. To

The control valve drive circuit 6 includes a microcomputer.
The control valve 17 is driven based on the control output from the
The refrigerant discharge capacity of the compressor 3 is controlled. The air mix damper drive circuit 23 drives the air mix damper 14 in the range from the solid line position to the two-dot chain line position in the figure based on the control output from the microcomputer 60.

The mode switching damper driving circuit 24 receives a first control signal based on a control output from the microcomputer 60.
Mode switching damper 15 and second mode switching damper 1
6 is driven in a range from a solid line position to a two-dot chain line position in the figure.

Next, control of the microcomputer 60 in the above configuration will be described with reference to FIG. Here, FIG.
Is a microcomputer 6 controlled by a room temperature control program.
Is a flowchart showing a part of the arithmetic processing of FIG.

First, at step 100, the vehicle room temperature, the outside air temperature, the amount of insolation, and the engine cooling water temperature detected by the sensor 4 are calculated.
From the evaporator outlet temperature (TE) and the vehicle interior set temperature inputted by the vehicle room temperature setting switch 5, the target outlet temperature (TAO) is calculated in a known manner.

Next, at step 110, the target evaporator
The outlet temperature (TEO) is calculated based on the relationship with the target outlet temperature (TAO) as shown by the solid line in FIG. Note that a specific calculation method is calculated by, for example, storing and reading out the characteristics shown in FIG. 4 in a memory. The dashed line in FIG. 4 shows a conventional example having a certain amount of reheat.

As shown by TEO in FIG. 4, TEO is constant with respect to the value of TAO up to a certain low region. That is, the evaporator is controlled so as to blow cold air at the minimum temperature. The slope of the TEO indicated by the solid line is TAO =
This indicates that the area is TEO, that is, the state has no refill amount. Further, when TAO becomes equal to or higher than a predetermined temperature, TEO is controlled so as to be blown at a certain maximum temperature.

Here, the region where TAO = TEO, that is, the slope portion shown by the solid line of TEO in FIG. 4 is the economy control region where the amount of refill is 0 and the power consumption of the compressor is reduced by increasing TEO. .

After calculating the target evaporator outlet temperature (TEO) in step 110, the outlet mode is calculated in step 120, and the blower air flow BLW is calculated in step 130.
Is calculated. Here, the blowing mode and the blower air volume BLW
Is calculated by storing the characteristic shown in FIG. 4 in a memory and reading it out.

Next, at step 140, the opening of the air mix damper 14 is calculated. Air mix damper 14
Is also calculated by storing the characteristic indicated by the solid line in FIG. 4 in a memory and reading it out.

Here, the air mix damper 14 is a TAO
= Starts opening after passing through the TEO area. That is, in the economy control region and the region where the target outlet temperature (TAO) is low, the air mix damper 14 is closed, and the reheat by the heater core 13 is set to zero.

At step 140, the air mix damper 1
After the opening degree of No. 4 is obtained, the target outlet temperature (TAO) and the target evaporator outlet temperature (TEO) are obtained in step 150.
Is determined to be equal to or not. That is, it is determined whether the economy control is being performed.

If it is determined in step 150 that TAO is not equal to TEO (NO), the process proceeds to step 210. If it is determined that TAO is equal to TEO (YES), the routine proceeds to the next step 160.

In step 160, the target outlet temperature (T
It is determined whether E) is higher than the target evaporator outlet temperature (TEO). TE> TEO at step 160
If not (NO), the process proceeds to step 210. If it is determined that TE> TEO (YES), the process proceeds to the next step 170. That is, in step 160, it is determined whether or not the blower air volume should be increased.

In step 170, the air volume correction value α is calculated according to the characteristics shown in FIG. Here, a method of calculating the air volume correction value will be described. The target outlet temperature (TE) is equal to the target evaporator outlet temperature (TEO) (TE = TE
O) Even when the state is stable, if a disturbance is caused by opening the window or changing the amount of solar radiation, a slight difference occurs between TE and TEO. If the blower air volume fluctuates each time this difference occurs, the occupant's mood will deteriorate. Therefore, in the case of the present embodiment, an invariable region of 3 ° C. is provided, and TE−TEO <3
In the case of ° C, a map as shown in FIG. 5 is stored in the microcomputer 60 so that the air volume correction is not performed.

When TE−TEO ≧ 3 ° C., the air volume correction is performed. However, when TE−TEO ≧ 10 ° C., the air volume correction is not performed. That is, in the range of 3 ° C ≦ TE−TEO ≦ 10 ° C, the air volume correction is performed according to the characteristics of FIG.

After calculating the air volume correction value α, the sum (BLW + α) of the blower air volume BLW before the air volume correction and the air volume correction value α, that is, the total air volume after the air volume correction is calculated in step 180, and BLW + α is calculated. It is determined whether or not it is equal to or more than the medium air flow (Me).

That is, if BLW + α exceeds Me, noise is generated or a feeling of airflow is felt and the user feels ill. Therefore, when the value exceeds Me (YES), step 1 is performed.
At 90, BLW + α = Me is corrected, and the corrected M
e to the blower drive circuit 7. If BLW + α ≧ Me is not satisfied (NO), the B
Output to the blower drive circuit 7 with the magnitude of LW + α. That is, the magnitude of BLW + α output to the blower driving circuit 7 is always equal to or smaller than Me.

By unifying BLW + α ≦ Me in this manner, the occupant does not feel bad due to noise or airflow. Then, all the air conditioning controls other than those described above are performed in step 210.

The target outlet temperature calculating means of the present invention corresponds to step 100 in the flowchart. The target evaporator outlet temperature calculating means of the present invention corresponds to step 110 in the flowchart.

The air volume calculating means of the present invention corresponds to step 130 in the flowchart, and the air volume correction value calculating means of the present invention corresponds to steps 150 and 16.
0, and corresponds to step 170. Further, the blower air volume control means of the present invention comprises the steps 180, 19
0 and step 200.

Although the embodiment of the present invention has been described in detail above, the invariable region in FIG. 5 does not have to be 3 ° C. In this embodiment, an external variable displacement compressor is used as a compressor for varying the amount of refrigerant supplied to the evaporator. However, a variable speed compressor or a general compressor may be used.

In this embodiment, the evaporator outlet temperature (T
E) When a difference is generated between the target evaporator outlet temperature (TEO) and the blower air volume is increased in accordance with the difference, the response time delay until TE = TEO becomes longer. Since the air volume can be corrected in accordance with the degree, the occupant does not feel bad due to the delay in response time.

By providing an invariable region for air volume correction, even if a window is opened or the amount of solar radiation changes to cause a subtle difference between TE and TEO, the blower air volume changes each time the difference occurs. The occupants will not feel bad.

By setting the upper limit of the total air volume after the air volume correction to the medium air volume (Me), noise is generated,
You won't feel bad and feel bad.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to a claim according to the present invention.

FIG. 2 is an overall configuration diagram showing a configuration of one embodiment of the present invention.

FIG. 3 is a flowchart showing a part of arithmetic processing of the microcomputer in the embodiment.

FIG. 4 is executed during the flowchart.
Blow mode, blower air volume, opening of air mix damper, and target evaporator for target outlet temperature (TAO)
FIG. 4 is a characteristic diagram showing a calculation mode of a blowout temperature (TEO).

FIG. 5 is a characteristic diagram showing a calculation mode of an air volume correction value α executed during the flowchart.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 blower 2 evaporator 4 sensor 5 vehicle room temperature setting device 60 control device 61 target outlet temperature calculating means 62 target evaporator outlet temperature calculating means 63 evaporator outlet temperature controlling means 64 air volume calculating means 65 air volume correction value calculating means 66 blower air volume control means 7 blower drive means 8 compressor drive control means

Claims (1)

(57) [Claims] A blower provided in the air conditioner unit for taking air into the air conditioner unit from inside and outside of the vehicle, and blowing the air from the outlet into the vehicle room; An evaporator for cooling the air in the air conditioner unit, a compressor for supplying a refrigerant to the evaporator, and a sensor for detecting at least a vehicle room temperature and an evaporator outlet temperature (TE); A vehicle room temperature setting device for setting a set temperature in the vehicle interior, a control device connected to the sensor and the vehicle room temperature setting device for supplying a control output to the blower and the compressor, and the control from the control device. Blower driving means for driving the blower based on the output; and driving the compressor based on the control output from the control device. Operating the compressor drive control means, wherein the control device calculates a target outlet temperature (TAO) at the outlet based on a control output from the sensor and the vehicle room temperature setting device. Calculating the target evaporator outlet temperature (TEO) based on the value of the target outlet temperature (TAO), and calculating the target evaporator outlet temperature (TEO) and the target outlet temperature (TAO). A target evaporator outlet temperature calculating means which is set to have an equal area; and a value of the target evaporator outlet temperature (TEO) and a value of the evaporator outlet temperature (TE) detected by the sensor. Evaporator outlet temperature control means for providing the control output to the compressor drive control means for controlling the evaporator outlet temperature (TE); Outlet temperature (T
AO) for calculating the airflow level of the blower based on the value of AO), and the target evaporator outlet temperature (T
EO) and the target outlet temperature (TAO) are equal, the air volume correction value of the blower is corrected based on the target evaporator outlet temperature (TEO) value and the evaporator outlet temperature (TE) value. Means for calculating an airflow correction value to be calculated;
The control output is supplied to the blower driving means based on the air volume level and the air volume correction value, and the target evaporator is provided.
Outlet temperature (TEO) and the evaporator outlet temperature (T
An air conditioner for a vehicle, comprising: a blower air volume control unit that increases the air volume as the difference from E) increases.