JPH04185523A - Air-conditioning control device for vehicle - Google Patents

Abstract

PURPOSE:To improve an occupant's comfort for air condition by controlling the rotation of a air blowing means based on vehicle speed and intake door opening to restrain increase in noise and fluctuation in room temperature. CONSTITUTION:In an air-conditioning device for a vehicle provided with an inner/outer air changing means, vehicle speed is detected by a vehicle speed detecting means 1. The position of an intake door 3 is detected by an intake door opening detecting means 2. The rotation of an air blowing means 4 is controlled by a controller 3. Moreover, the rotation of the air blowing means 4 is controlled based on vehicle speed and an intake door opening signal that is if it is at a position of inner recirculation or at a midway position of inner and outer air for some reasons or other or vehicle speed is low, the rotation of an air blower is decreased to restrain increase in blower fan flow rate. It is thus possible to reduce air-conditioning noise and prevent change in room temperature.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an air conditioner for an automobile.

BACKGROUND ART Automotive air conditioning systems aim to maintain a comfortable environment inside the vehicle and enable safe and comfortable driving.

Conventional automotive air conditioners that provide a better environment include those that reduce noise from the ProA fan by controlling the opening of the air mix door and the rotation speed of the ProA fan motor based on the amount of solar radiation. (Refer to Japanese Unexamined Patent Publication No. 59-34912). In addition, there is a method in which the noise of the air blowing means is suppressed by controlling it to a concentrated blowing mode when the air blowing amount exceeds a predetermined value.
(See Publication No. 141117).

Another conventional example is one in which a sudden change in temperature inside the vehicle is avoided by controlling an inside/outside air switching damper according to changes in vehicle speed (Japanese Patent Application Laid-Open No. 58-167223, (See Publication No. 59-38120).

Furthermore, during driving, the intake door is often changed to the internal air circulation mode. For example, when driving behind a large vehicle such as a truck, the vehicle is often switched to the internal air circulation mode in order to avoid bad odors from the outside air, such as to prevent bad odors from the truck's exhaust gas from entering the room. Furthermore, even if the outside air is extremely hot, the inside air circulation mode may be set to prevent the cabin temperature from rising.

Problems to be Solved by the Invention However, in conventional automotive air conditioners, problems occur when the inside/outside air switching damper (intake door) is switched to the inside air side or is located between inside and outside air. However, since the air-conditioning air intake on the inside of the vehicle is opened, the noise from the pro-a fan increases.

In addition, unless the vehicle speed is very high, when the same fan voltage is applied for internal air circulation than for outside air intake, the amount of air blown into the passenger compartment will be larger, resulting in greater fluid noise from the air distribution duct and outlet grille. Become. In addition, the room temperature also changes temporarily, which significantly reduces the comfort of the occupants. Furthermore, this problem becomes more pronounced as the rotation speed of the proa fan increases, that is, the voltage applied to the fan increases (see FIG. 4, which will be described later).

The present invention has been made by focusing on such conventional problems, and addresses an increase in ventilation noise when the intake door is located on the inside air circulation side or when it is located between inside and outside air. The purpose of the present invention is to provide an air conditioning system for automobiles that suppresses air conditioning and room temperature fluctuations and improves air conditioning comfort for passengers.

Means for Solving the Problems Therefore, as shown in FIG. 1, the present invention provides a vehicle air conditioner having an inside air/outside air switching means, which includes a vehicle speed detecting means 1 for detecting the vehicle speed and a position detecting means for detecting the position of the intake door 3. and a control device 3 for controlling the rotation of the air blowing means 4, and controlling the rotation of the air blowing means 4 based on the vehicle speed and the intake door opening signal from the detection means. It is characterized by

If for some reason the intake door is in an intermediate position between inside air circulation or inside air and outside air, or if the vehicle speed is low, the rotation of the blower is lowered to suppress an increase in the flow rate of the proafan.

This reduces air conditioning noise and prevents temperature changes in the room.

Example Hereinafter, the present invention will be explained based on the drawings.

First, an air conditioner implementing the present invention will be explained with reference to FIG.

The air conditioner main body 5 is configured by connecting a proa unit 6, a cooling unit 7, and a heater unit 8.

The proar unit 6 is provided with an intake door 11 that opens and closes the outside air intake port 9 and the internal air inlet 10, and a proa fan 13 which is a blowing means and whose driving source is a proa fan motor 12. An intake door actuator 14 is linked to 11. An evaporator 15 is provided in the cooling unit 7.
However, a heater core 16 that uses engine cooling water as a heat source is installed in the heater unit 8, and an air mix door 18 linked to an air mix door actuator 17 is mounted in front of the heater core 16. It is set up. The heater unit 8 is provided with a ventilator outlet 19, a defroster outlet 20, and a foot outlet 21, and the base ends of the outlets 19, 20, 21 are connected to a vent door actuator 22. vent door 2
3, and the ventilator outlet 19 on which the defroster/foot switching door 25 linked to the defroster/foot switching door actuator 24 is pivotally connected is connected to the front seat 26.
A plurality of them are formed on an instrument panel 27 disposed in front of a passenger (not shown) seated in the vehicle.

On the other hand, the input section of the controller 28 that is a control device includes an outside temperature sensor 29, a room temperature sensor 30, a room temperature setting device 31, a solar radiation sensor 32, and an outlet temperature sensor 33 that detects the outlet temperature of the ventilator outlet 19. A vehicle speed signal from a vehicle speed sensor 34 serving as a vehicle speed detection means, and an intake door opening signal from an intake door opening sensor 35 serving as an intake door opening detection means are input.

Further, from the output section of the controller 28, the actuators 14, 17, 22, 24 . Proa fan motor 1
2 and the wind direction setting device 36.

Next, FIG. 3(A) shows the control operation of one embodiment of the present invention.
This will be explained according to the flowchart in (B).

When the power is turned on and the device starts, the first step is step 1.
At step 01, constants used in the control operation, that is, constants A to E used in the formula for calculating the target outlet temperature Tof and constants FH used in the formula for calculating the opening degree X of the air mix door are set.

In step 102, a time constant Δt is set.

In step 103, a time counter built into the controller 28 is set.

In step 104, the intake door opening sensor 35
Intake door opening X+d detected by vehicle speed sensor 34
Input the vehicle speed Spd detected at , and time td from the time counter. Here, Xl is a function representing the opening degree of the intake door 11 and takes a value of 0≦X1≦1, and when Xl-1, outside air is introduced, and when Xl-0, inside air is circulated.

In step 105, two arrays X+m(1) and Xlm(
2) stores X and d obtained in step 104. Similarly, n arrays S pm(1) of controller memory
, S pm (2), =-=-, the vehicle speed Spd is stored in S pm (n), and the time td is stored in one array tm (1).

In step 106, the outside air temperature Ta,
The room temperature Tic is input from the room temperature sensor 30, the room temperature set value Tset is input from the room temperature setter 31, and the amount of solar radiation S is input from the amount of solar radiation sensor 32.

In step 107, the blower fan applied voltage V fan that controls the air volume of the blower fan 13 is set to step 106.
It is determined by the difference between the room temperature Tic input in and the room temperature set value T set, that is, (T ic - T 5et).

Specifically, the larger this deviation is, the more the applied voltage is increased.
By increasing the air volume, the room temperature can be quickly brought close to the set value.

In step 108, the target outlet temperature Tof is set to the outside temperature Ta.
, the room temperature T ic , the room temperature set value T set , and the amount of solar radiation S are calculated using equation 1).

Tof-A-Ta+B-Tic+C-Tset+D-S
+E-(1) (A-E is a constant) In step 109, the opening degree X of the air mix door 18 is calculated based on the target blowout temperature Tof calculated in step 108 using equation (2).

X= f −Tof2+G−Tof+H・−== (2
) (F-H is a constant) In step 110, the blowing mode is determined based on the target blowing temperature Tof calculated in step 108. That is, if the target blowing temperature is high, the heater mode is set, if the target blowing temperature is medium, the high level mode is set, and if the target blowing temperature is low, the vent mode is set.

In step 111, the intake door opening degree X, d from the intake door opening degree sensor 35, the vehicle speed Spd from the vehicle speed sensor 34, and the time td from the time counter at the time of execution of step 111 are input.

In step 112, if the intake door opening degree X, d read in the previous step 111 is 1, that is, outside air is not introduced, the process proceeds to step 113.

If outside air is to be introduced, the process advances to step 119. The blower fan applied voltage setting value V f calculated in the previous step
an is applied to the blower fan motor 12.

In step 113, the time td read in the previous step 111 is compared with tm(1) stored in the memory. If the difference is not smaller than the time constant Δt, the process advances to step 114. If the difference is less than △t, step 1
Proceeding to step 19, the blower fan applied voltage setting value V fan calculated in the previous step is applied to the blower fan motor 12.

The time constant (time interval) Δt will be explained below. One loop time from step 106 to step 120 is quite short, on the order of several tens of microseconds to several hundred microseconds, and even if the opening degree of the intake door 11 changes, there is a possibility that it cannot be detected in a short time interval. Therefore, the current time is compared with the time when the previous control from steps 114 to 118 was performed, and the difference between the two is determined at step 102.
If it is larger than the time interval △t set in step 11
The operations from step 4 to step 118 are performed, and if the difference is smaller, the process proceeds to step 119. Therefore, the time interval Δt is set to a time interval at which a change in the opening degree of the intake door 11 can be detected, that is, a time interval at which a determination can be made at step 116, which will be described later.

In step 114, data is re-stored in the controller memory so that the data of the newest time is stored in the ascending order of the array number.

That is, X+m(2)=Xv(1), X tm(1) −X +
dS pm(n) −S pm(n-1), S pm(
n-1) = S pm(n-2),..., Spm(
2)=Spm(1), Spm(1)=Spd Also, the time is changed to the new data read in step 111.

tm(1)-td In step 115, if the value of the latest opening degree X1m(1) of the intake door 11 is O, that is, internal air circulation, the process proceeds to step 117; otherwise, the process proceeds to step 116.

In step 116, the opening degree of the intake door 11 at the old time and the new time, X+m(2) and X+m(1), are compared, and if the opening degree at the old time XIm(2) is larger, step 117 , otherwise step 1
Proceed to step 19.

This also applies when the intake door 11 is not completely in the inside air circulation position but is transitioning to the inside air circulation position.
This is to proceed to steps 1.17 and 118 and perform control similar to internal air circulation.

In step 117, a corrected vehicle speed is calculated from the past vehicle speed value. Here, the corrected vehicle speed S pm f (S pm (1)
, Spm(2), ..., Spm(n)), the average calculation S p'' (S pm(1),...
..., S pm(n))/n can be considered. Also,
When the response is particularly fast, simply calculate S pm S pm (1
) can also be used. Also, an average ring in which each speed is multiplied by a weighting coefficient can be considered. Various other functional relationships can be considered.

In step 118, a correction voltage based on the fan applied voltage Vfan and a correction voltage V crs based on the vehicle speed signal Sp are determined.

A correction coefficient γ is determined based on the intake door opening degrees X and d, and a corrected blower fan applied voltage V′ fan is calculated using equation (3).

V'fan=Vfan -7(Vcrb -Vcrs
) -C3) Then, the blower fan applied voltage V fan determined in step 107 is corrected, and step 11
Proceed to 9.

In step 119, the blower fan applied voltage Vfan determined in step 107 or the blower fan applied voltage V'fan corrected in step 118 is output to the blower fan motor 12.

In step 120, each door actuator 22.2
Output to 4 and set the door.

In this way, one loop ends. And step 1
Return to 06 and repeat this loop again.

Here, the meaning of the control in step 118 will be explained. FIG. 4 shows the change in air volume of the air conditioner with respect to the blower fan applied voltage for the inside air circulation mode and the outside air introduction mode. For outside air introduction mode, vehicle speed is 0, 40, 100 & R/h.
Shows the air volume at the time.

As can be seen from this figure, even when the vehicle speed is 100 m/h, the air conditioning air volume is larger in the inside air circulation mode than in the outside air introduction mode even if the same blower fan applied voltage is applied in the inside air circulation mode and the outside air introduction mode. . This tendency becomes more pronounced as the fan applied voltage increases, and becomes thicker as the vehicle speed decreases.

Therefore, taking this into consideration, the blower fan applied voltage is corrected. That is, the larger the blower fan applied voltage V fan is, the larger the correction voltage V crf is, and the vehicle speed S
The slower p is, the larger the amount of correction voltage V crs is. Furthermore, for these correction voltages V crf and V crs, 1 is set when the intake door 11 is in internal air circulation, and 0 is when outside air is introduced.
A correction coefficient γ based on the intake door opening degree is multiplied so that the correction is made in accordance with the opening degree of the intake door 11.

Note that in step 118 of FIG. 3(C), a simple linear relationship, that is, a straight line correction amount is illustrated, but any functional relationship having the above-mentioned characteristics is sufficient.

Now, Vcrs -a VfanSVcrf - βV f
If an is substituted into equation (3) of step 118, V'fan=(1-7(α-β))Vfan is obtained. Here, α is a function of the vehicle speed signal Sp, β is a function of the blower fan applied voltage V fan, and γ is a function of the intake door opening degree X1, so the correction equation can generally be written as the following equation.

¥fan=f (Sp, Vfan, XId)
Vfan where f means a function. That is, the correction amount is a function of Sp, Vfan, X, and d. Therefore, it is good to have such a functional relationship.

Next, FIGS. 5 and 6 show temporal changes in blower fan applied voltage, blower fan flow rate, air conditioning noise, and room temperature when the intake door 11 is changed from outside air introduction to inside air circulation, with and without implementing the present invention. This will be explained using figures.

Figure 5 (a), (b), (c), (d),
(e) shows the opening degree of the intake door when the intake door 11 is switched from the outside air introduction mode to the inside air circulation mode during cooling in an air conditioner that guides outside air to the air conditioning unit via a cowl box, duct, etc. , represents temporal changes in blower fan applied voltage, blower fan flow rate, air conditioning noise, and vehicle interior temperature. here,
For simplicity, the outside temperature is Ta.

It is assumed that there is no change in the room temperature set temperature T set, the amount of solar radiation S, etc., and the indoor environment is stable in a steady state.

Note that the solid line indicates the case where the present invention is implemented, and the broken line indicates the case where the present invention is not implemented.

FIG. 5(a) shows the intake door opening degree X+.

XI is a function representing the opening degree of the intake door 11, and 0≦X
Takes a value of +≦1, and when x and -1, outside air is introduced, and X1=0
indicates shyness induction. The figure shows the case where the outside air introduction changes to the inside air circulation at time tch, that is, from X1=1 to
, =0. Note that the time scale is such that the time interval during which the intake door 11 moves from the outside air introduction position to the inside air circulation position can be ignored.

First, the case (broken line) in which the present invention is not implemented in FIGS. 5(b) to 5(e) will be described.

As shown in FIG. 5(b), the blower fan applied voltage is
Even if the intake door 11 changes from outside air to inside air at time tch, there is no change.

By the way, as shown in FIG. 4, when the voltage applied to the blower fan is the same, the flow rate of the blower fan is larger when circulating inside air than when introducing outside air. Therefore, as shown in FIG. 5(C), the flow rate of the blower fan increases stepwise at the moment the intake door 11 changes from introducing outside air to circulating inside air.

Therefore, the fluid noise from the blower fan 13 and the air conditioning grill increases, and as shown in FIG. 5(d), the air conditioning noise from the air conditioning system increases stepwise at time tch.

Furthermore, as the flow rate of the blower fan increases, the temperature inside the vehicle gradually decreases as shown in FIG. 5(e).

This change in the vehicle interior temperature feeds back...
), (c), (d), and (e), each physical quantity settles down to the level that was stable when outside air was introduced, but at time tch, the intake door 11 starts circulating inside air while introducing outside air. Changes in blower fan flow rate, air conditioning noise, and vehicle interior temperature are unavoidable.

Next, a case (solid line) in which the present invention is implemented in FIGS. 5(b) to 5(e) will be described.

As shown in Figure 5(b), the blower fan applied voltage is
At time tch when the intake door 11 is switched, a correction voltage V c based on the fan applied voltage V fan calculated in step 118 of the flowchart shown in FIG.
rf and the correction voltage V crf based on the vehicle speed Sp.

As a result, the flow rate of the blower fan does not change after time tch, as shown in FIG. 5(C).

Conversely, the voltage applied to the blower fan is lowered so that the flow rate of the blower fan does not change.

As a result, as shown in FIG. 5(d) and FIG. 5(e),
Changes in air conditioning noise and room temperature after time tch can also be avoided.

The above explanation has been made regarding the time of cooling, but the same holds true during the time of heating. In addition, outside temperature Ta, indoor temperature T
ic, room temperature set temperature T set, solar radiation amount S, etc., and the indoor environment is stable in a steady state.

Figure 6 (a), (b), (c), (d)
, (e) is Fig. 5 (a), (b), (c), (d)
, (e) are expressed on a time scale such that the time interval during which the intake door 11 moves from the outside air introduction position to the inside air circulation position can be seen.

As in FIG. 6, the solid line shows the case where the present invention is implemented, and the broken line shows the case where the present invention is not implemented. Further, the time required for the intake door 11 to move from the outside air introduction position to the inside air circulation position is expressed as tei.

In reality, the movement of the intake door 11 is carried out using the steps shown in FIG. 6 (a).
Although it takes time as shown in ), as can be seen from FIG. 6(b), the blower fan applied voltage changes in accordance with the change in the opening of the intake door 11. Therefore, according to the present invention, the flow rate of the blower fan is as shown in FIG. 6(C).
Does not change due to switching.

Therefore, as shown in FIGS. 6(d) and 6(e), the air conditioning noise and the vehicle interior temperature do not change.

FIGS. 7(A) and 7(B) show flowcharts for other embodiments of the present invention.

The flowchart of this embodiment has most of the same control operations as the flowchart of the embodiment described above, so
Only the different steps 217 will be described.

In step 217, the room temperature Tic and the room temperature set value T se
If the absolute value of the difference with f is smaller than a certain determined temperature value Tcr, the process proceeds to step 218; otherwise, the process proceeds to step 220.

What this step 117 means is that when a car is left in the hot sun, or conversely, when the air conditioner is turned on in a car in the middle of a winter morning, the discomfort caused by the thermal sensation is greater than the noise of the air conditioner. When the temperature rises, the air volume of the blower fan increases as described above when the internal air circulation mode is selected, so it is possible to bring the temperature closer to the set temperature more quickly.
In such a case, the process is carried out in the same way as during normal cool-down without modifying the blower fan applied voltage. For this reason, the predetermined temperature Tcr is set to a temperature difference corresponding to a relatively large fan applied voltage.

According to the present invention, the increase in air conditioning noise and the increase in air conditioning noise when the intake door is set to internal air circulation for some reason, or when it is in an intermediate position between internal and external air, can be prevented. Since changes in room temperature can be prevented without reducing the airflow volume, the air-conditioned comfort of the passengers is greatly improved.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing the basic configuration of the present invention, FIG. 2 is a block diagram schematically showing an air conditioner used to implement the present invention, and FIGS. 3 (A) and (B) are A flowchart explaining the control operation according to one embodiment, FIG. 4 is a diagram showing the relationship between the blower fan applied voltage and the blower fan air volume,
Figure 5(a). (b), (c), (d), and (e) are diagrams showing the temporal changes in each characteristic value before and after the time when the outside air introduction mode changed to the inside air circulation mode during cooling.
Figure 5 (a) is a diagram showing the temporal change in the intake door opening degree, Figure 5 (b) is a diagram showing the temporal change in the blower fan applied voltage, and Figure 5 (c) is a diagram showing the temporal change in the blower fan flow rate. FIG. 5(d) is a diagram showing temporal changes in air conditioning noise, FIG. 5(e) is a diagram showing temporal changes in vehicle interior temperature, and FIG. 6(a). (b), (c), (d), and (e) are Fig. 5(a). Figure 6 (b), (c), (d), and (e) are time change diagrams that represent the time intervals at which the intake door moves from the outside air introduction mode to the inside air circulation mode position on a time scale that allows you to see the time interval. Figure 6 (a) is a time change diagram of intake door opening degree, Figure 6 (b) is a time change diagram of blower fan applied voltage, Figure 6 (c) is a time change diagram of blower fan flow rate, and Figure 6 (d) is a time change diagram of air conditioning noise. FIG. 6(e) is a time change diagram of the vehicle interior temperature, and FIGS. 7(A) and 7(B) are flowcharts illustrating the control operation of another embodiment of the present invention. ■...Vehicle speed detection means, 2...Intake door opening detection means, 3...Control device, 4...Blower, 9...
Outside air intake port, 10... Inside air intake port, 11... Intake door, l2... Prower fan motor, 13...
Prower fan, 14... Intake door actuator, 28... Controller, 34... Vehicle speed sensor,
35... Intake door opening sensor, 36... Wind direction setting device. Figure 1 Figure 4 Applied voltage (v) Figure 5 (a) (d) (b
) (e) (c) 6th (a) el (b) ■ t@1 (c) (d) el (e)

Claims (1)

[Claims] (1) A vehicle air conditioner having an inside/outside air switching means includes a vehicle speed detection means for detecting the vehicle speed, an intake door opening degree detection means for detecting the position of the intake door, and a control device for controlling the rotation of the blowing means. An air conditioner for an automobile, characterized in that the rotation of the air blowing means is controlled based on the signals from both of the detection means.