JP2658456B2 - Automotive air conditioning controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to an air conditioning control device for an automobile that controls air conditioning in a passenger compartment of an automobile.

(Prior Art) As a conventional automotive air conditioning control device, for example, Japanese Patent Application Laid-Open
-86814. This device is configured to control the blow-out of the conditioned air from the blow-out port to be switched between a continuous blow-out state in which the air is blown out continuously and an intermittent blow-out state in which the air is blown out intermittently according to the temperature difference between the detected room temperature and the set room temperature. ing. That is, this air-conditioning control device improves comfort by continuously blowing conditioned air to the occupant when the detected room temperature is higher than the set room temperature by a predetermined value or more, and when the detected temperature is sufficiently close to the set room temperature. Is designed to eliminate discomfort such as too cold by blowing air conditioning air to the occupant intermittently.

(Problems to be Solved by the Invention) However, in such an air-conditioning control device, when the detected temperature sufficiently approaches the set room temperature, the air-conditioning air only blows out to the occupant intermittently, and what intermittent change is good. For example, when the heat load is slightly lower than the set room temperature, the wind speed changes and the user feels annoyance.

On the other hand, the present applicant has proposed an automotive air-conditioning control device in which a high wind speed blowing mode and a low wind speed blowing mode are switched by changing the amount of solar radiation to vary the respective maintenance times. (Japanese Patent Application No. 62-323372) Thus, in the control of changing the maintenance time of the blow-out mode by changing the amount of solar radiation, more appropriate control can be performed than in the above-described conventional example, but when the amount of solar radiation is low, the change in wind speed is troublesome. Becomes

Further, the applicant of the present application has proposed an air-conditioning control device for a vehicle (Japanese Patent Application No. 61-19362) in which a low-velocity diffusion blowing mode is used when the detected room temperature sufficiently approaches a set room temperature. However, if the diffusion blowing mode with a low wind speed is continued for a long time, the stimulation of the wind speed is lost, and there is a possibility that the feeling of comfort is also lowered. This is because the warm and cool intervals of the occupant's skin are paralyzed without the stimulation of the wind speed. For this reason, the occupant performs an operation to increase the wind speed or the air volume, but when the wind speed or the air volume is increased for a long time, there is a problem that the heat transfer from the skin becomes excessive due to an excessive amount of heat transfer from the skin, resulting in coldness and discomfort. .

From these facts, when the heat load in the vehicle interior is relatively high, it is desirable to evaporate periodically generated sweat because the occupant sweats much. It can be said that it is desirable that there is some change that is not bothersome, that is, that it is closer to the natural style.

Here, the goodness of the natural wind is very different as shown in FIG. 7 and FIG. In these figures, the horizontal axis represents frequency and the vertical axis represents power spectrum in logarithmic representation. These figures show the strength of each of various frequencies included in the wind.

From FIG. 7, the natural wind has a large low frequency component and a small high frequency component. Also, it can be seen from FIG. 8 that the difference in magnitude between the low-frequency component and the high-frequency component of the wind from the fan is small. From this, it can be said that the natural wind basically has a slow change, and the short-time change overlaps based on the slow change.

In general, it can be said that natural wind is suitable for humans because this slow component produces an appropriate fluctuation within a large and troublesome range.

Therefore, an object of the present invention is to provide an air conditioning control apparatus for an automobile which can make the air flow as close as possible to natural wind under the condition of a low heat load and can further improve comfort.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention relates to a first blow mode in which a blower fan blows conditioned air from a first blow mode having a high wind speed as shown in FIG. An outlet CL1 having a function of switching to a second outlet mode having a lower opening temperature, an indoor heat load detecting means CL2 for detecting a vehicle interior heat load, and the outlet CL1 in a first outlet mode and a second outlet mode. Signal generation means for determining and outputting a constant maintenance time for alternately maintaining a constant cycle in accordance with the detected vehicle interior heat load
CL3 and the thermal load for detecting the increasing / decreasing time width, while determining the maintaining time which is not constant by increasing / decreasing the time width which is not constant with respect to the constant holding time outputted by the first signal generating means CL3. A second signal generating means CL4 for increasing and decreasing according to the increase and decrease, and a control means CL5 for controlling the outlet CL1 with a non-constant maintenance time outputted by the second signal generating means CL4. And

(Operation) According to the above configuration, when the detected thermal load increases, the time width of increase / decrease in the second signal generation means CL4 is reduced to maintain the constant output from the first signal generation means CL3. The non-constant time width is increased or decreased with respect to time, and the non-constant maintenance time is determined. When the detected heat load decreases, the time width of the increase / decrease is increased to increase / decrease with respect to a fixed maintenance time, and an unstable maintenance time is determined. The control means CL5 controls the air outlet CL1 for a non-constant maintenance time outputted by the second signal generation means CL4, so that the air outlet CL1 can be made to approach the natural wind as a whole.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a configuration diagram according to one embodiment of the present invention. The vehicle of this embodiment includes an air conditioning unit 1 in a vehicle instrument. The air-conditioning unit 1 includes a blower fan 7 downstream of an intake door 5 for selectively switching a suction port 3 for air from a vehicle compartment or from outside the vehicle compartment.
A compressor (not shown) is provided downstream of the blower fan 7.
An evaporator 9 for introducing a refrigerant from a refrigeration cycle including a condenser, an expansion valve, and the like, and cooling and passing the blown air.
And a heater core 11 for introducing cooling water for an engine (not shown) and passing the blown air overheated by the heat. The heater core 11 is provided with an air mixing door 13 that adjusts the temperature by adjusting the ratio of the air passing through the evaporator 9 to the heater core 11.

The air-conditioned air whose temperature has been adjusted is blown out from the vent outlet 15 and the foot outlet 17 which are the outlet CL1, so that the inside of the passenger compartment is controlled to an appropriate temperature. Further, the vent outlet 15 can be switched between a concentrated blowing mode as a first blowing mode having a high wind speed for concentrating the blowing airflow in the direction of a target occupant and a diffusion blowing mode as a second blowing mode having a low wind speed for diffusing the entire vehicle interior. Has functions. That is, wind direction setting devices 37, 39, 41, and 43 are provided on the front of the instrument and directed to the occupant of the front seat 35 by controlling the wind direction louver of the conditioned air from the vent outlet 15. The mode can be set above the head of the seat occupant, and the mode can be switched. (See, for example, Japanese Patent Application No. 63-125502 of the applicant of the present invention.) The intake door 5 is rotated by an intake door driving device 19, and the blower fan 7 is a blower fan motor.
The air mixing door 13 is rotated by an air mixing door driving device 23.

The vent outlet 15 includes a vent door 25, which is turned by a vent door drive device 27.
The foot outlet 17 has a defroster outlet of the foot outlet 17.
29 is provided with a switching door 31 for switching the ventilation, and the switching door 31 is rotated by a switching door driving device 33.

At an appropriate position outside the vehicle compartment, an outside air temperature detector 45 for detecting the outside air temperature and a solar radiation amount detector 47 for detecting the amount of solar radiation are provided. Further, at an appropriate position in the cabin, the solar radiation detector
Indoor heat load detection means CL that detects the indoor heat load together with 47
A room temperature detector 49 serving as 2 and a room temperature setting device 51 for setting the room temperature are provided.

The signal detected by each of the detectors 47 to 49 and the signal set by the setting unit 51 are input to a microcomputer 53 as control means CL5, and the microcomputer 53 outputs driving devices 19, 23, 27, and 33. And a driving signal to the blower fan driving device 21.

Next, the operation of this embodiment will be described with reference to the control flowchart of FIG.

When the A / C switch is turned on after the key switch is turned on, an initial setting of the multiplier used in this control flowchart is performed in step S1. That is, it is a set of the multipliers A to E used in the calculation formula of the target outlet temperature T _OF ', the FGH used in the calculation formula of the air mix door opening X, and L1 to L3 used in the heat load calculation.

Next, in step S2, the outside air temperature T _A detected by the outside air temperature detector 45, the insolation S detected by the insolation detector 47, the room temperature T _IC detected by the room temperature detector 49, and the room temperature setting unit 51 are set. each data such has been set room temperature T _sET is read.

In step S3, the difference between the room temperature T _IC and the set room temperature T _SET (T _IC
−T _SET ) sets the blower fan applied voltage V _fan . Specifically, as the deviation is larger, the applied voltage is increased and the air volume is increased to bring the room temperature T _IC closer to the set room temperature T _SET .

Next, in step S4, the outside air temperature T _A , the room temperature T _IC , and the solar radiation S
From the set room temperature T _SET, the target outlet temperature T _{OF '} is calculated using the constants A to E, and from the target outlet temperature T _OF', the air mix door opening X is calculated using the constants F to H ( Step S5).

Next, in step S6, the blowing mode is calculated based on the target blowing temperature T _{OF '} . That is, the target outlet temperature T
_{If OF} 'is high, the heater mode (foot blowing) is used. If it is moderate, the bi-level mode (vent and foot blowing) is used. If it is low, the vent mode (vent blowing) is used.

In step S7, the blowing mode is determined, and if the mode is the vent mode, the process proceeds to step S8; otherwise, the process proceeds to step S17.

In step S8, the room temperature T _IC is compared as a set amount having a hysteresis of 27 ° C. to 28 ° C. Here if located in line on the hysteresis as shown if the current 27.2 ° C. In previous 29 ° C. from room temperature T _IC, will be this state is referred to as "ON" state. Similarly, if it was 23 ° C. before and now 27.5 ° C., it is on the line below the hysteresis as shown, and this state is called “OFF”. In order to change from the ON state to the OFF state, the room temperature T _IC must be lower than 27 ° C. Similarly, in order to change from the OFF state to the ON state, the room temperature T _IC
Must exceed 28 ° C.

It should be noted that some quantities having hysteresis appear in the following description, but since each has the meaning described here, a detailed description thereof will be omitted.

If it is ON, the process proceeds to step S10, and if it is OFF, the process proceeds to step S9.

In step S9, the solar radiation S is increased from 400 Kcal / m ² h to 400 Kcal / m
Compare with the set value with ² h of hysteresis. If the amount of solar radiation is larger than the set value and is in the ON state, step S12 is performed.
The process proceeds to step S11 if the process is in the OFF state.

In the step S10, a concentrated fixed blowing mode is set.
That is, the air outlet is fixed to the centralized air blowing mode, and when the vehicle interior temperature is high, the conditioned air is intensively blown out to the occupant to improve the comfort. In step S11, the diffusion fixed blowing mode, that is, the outlet is fixed to the diffusion blowing mode. Therefore, when the temperature in the vehicle compartment is low and the amount of solar radiation is low, the wind speed is reduced to prevent the vehicle from being too cold, and the comfort is further improved.

In step S12, the heat load L is calculated from the room temperature T _IC and the solar radiation S. The calculation result of the heat load L is adjusted so as to be distributed in the range of 0 to 1. If it becomes 0 or less, it is reset to 0, and if it becomes 1 or more, it is reset to 1.

In step S13, a variable wind mode is set in which the concentrated blow mode and the diffuse blow mode are alternately repeated. Then, determined in accordance with the thermal load L that has detected the predetermined period t _c as a maintenance time constant switching the order both modes.
This periodic t _c is determined alternately for each mode, a certain period t _c centralized blowing mode becomes the maintenance time of the diffusion blowing mode, a constant period t _c of the diffusion blowing mode is a maintenance time of intensive blowing mode. This determination is made by the microcomputer 53. Therefore, in this embodiment, the microcomputer 53 switches the outlet between the first outlet mode, the concentrated outlet mode, and the second outlet mode, the diffuse outlet mode, at a constant period. constitute a first signal generating means CL3 which determines and outputs in response to the passenger compartment heat load L to constant the detection maintenance time t _c has to maintain alternately. Here, the higher the heat load, the longer the time of concentrated blowing and the shorter the time of diffusion blowing. That is, by increasing the time of the high wind speed, the occupant is further cooled by the conditioned air. On the other hand, when the heat load is low, the time of the low-speed conditioned air is extended to prevent excessive cooling by the conditioned air. In this example, when the thermal load L is near 0, the time of the concentrated blowing is set to 0, and is set to increase with the iron load L. When the heat load L exceeds 1, the time is set to 100 seconds. However, since the heat load L does not exceed 1, the maximum is 20 seconds.
Limited by seconds. Similarly, the diffusion blowing time is set to a long time of 100 seconds under the condition of a low heat load, but becomes shorter as the heat load increases, and finally the minimum time is 10 seconds.

In the concentrated blowing mode, the maintenance time of the concentrated blowing is adopted, and in the diffusion blowing mode, the maintaining time of the diffused blowing is adopted.

Then, in step S14, and outputs the time t _r as a reference when increasing or decreasing the respective non-constant time width to the period t _c is a constant maintenance time. Half the period t _c is a constant maintenance time in this embodiment, that is, a t _r = 0.5 × t _c.

In step S15, a random ratio α is generated. This α randomly generates an arbitrary value in the range of −1 to 1 without bias. The α by decide whether to increase or decrease the time width not constant with period t _c is a constant maintenance time, and further determines the time width of the increase or decrease. If α is negative, the value is decreased, and if α is positive, the value is increased. Then, it is the time width of the increase or decrease closer to ± 1 is increased closer to t _r.

In step S16, the period t _c which is the constant maintenance time
, A calculation is performed to increase or decrease the non-constant time width, and the non-constant maintenance time for controlling the outlet is determined. The correction period t is obtained as t = t _c + t _r × α as the non-constant maintenance time. The maintenance time in the concentrated blowing mode and the diffusion blowing mode is set based on the thus calculated non-constant maintenance time t.

That is, determines and outputs in accordance with constant maintenance time for maintaining the mode blowing diffusion and concentration blowing mode in step S13 alternately at a predetermined period t _c to the heat load L. The maintenance time that is not constant with respect to the maintenance time determined in this manner is determined by performing steps S14, S15, and S16. These settings are carried out by the microcomputer 53. In this embodiment, the microcomputer 53 increases or decreases the inconstant maintenance time outputted from the first signal generating means CL3 so as to reduce the inconstant maintenance time. The second signal generating means CL4 which is determined and increases / decreases in accordance with an increase / decrease of the thermal load L for detecting an increasing / decreasing time width is configured.

In the following and description, when the concentrated blowing mode and the diffusion blowing mode are alternately maintained for the determined non-constant maintenance time, there is a random difference. , The degree of randomness (randomness) is reduced, and the case of increase according to the decrease of the thermal load L is increased.

In step S17, the air flow of the blower fan 7 determined in step S3 is output to the blower fan motor 21 at a set voltage.

In step S18, the output is sent to the drive devices 19, 23, 27, 33 of the respective doors, and door setting is performed.

With this control, when the detected room temperature approaches the set room temperature and reaches a steady state, if the amount of solar radiation fluctuates and the indoor heat load increases, the concentrated blowing time is extended and the random ratio is reduced to reduce the wind speed. Comfort is improved by the conditioned periodic airflow. Also, under conditions where the amount of solar radiation is reduced and the heat load is low, the diffusion blowing time is extended and the random ratio is increased to make the air conditioning air more relaxed, but in a state close to the natural wind where the wind speed can be changed, further improving comfort. Will be able to

To further explain with reference to FIG. 4, FIG. 4 shows a comparison between the difference depending on the magnitude of the heat load and the difference depending on the presence or absence of randomness by the time change of the blowing mode.

First, when there is no randomness and when the thermal load is small, the diffusion blowing time becomes considerably longer than the concentrated blowing time (FIGS. 4A and 4B). On the other hand, when the heat load is large, the concentrated blowing time and the diffusion blowing time are substantially the same (FIGS. 4 (c) and 4 (d)).

Next, when there is randomness, the degree of randomness is smaller when the thermal load is small (FIG. 4 (b)) and when the thermal load is large (FIG. 4 (d)). That is,
Even random changes are close to constant periodic changes. If the random ratio changes according to the heat load, and the heat load is high, the concentrated air blowing mode with a high wind speed and the diffusion air blowing mode with a low wind speed both take an abnormally long time so that the amount of perspiration is appropriate. Not to do. This can prevent a problem in which the wind speed is high for a long time and the user feels cold, and a problem in which the wind speed is low for a long time and sweating increases and the user feels hot can be prevented. On the other hand, when the heat load is low, the slow period similar to the natural wind acts largely by changing the time of the blowing mode in which the wind speed is low.

Further, the applicant of the present application conducted an experiment in order to grasp the degree of the effect of this embodiment, and the results are shown in Tables 1 and 2 in FIGS.
It is shown in Table 2. In this experiment, the following two types of experiments were compared under the same heat load conditions using exactly the same experimental facility.
In other words, a common control method is used until the determination of the concentration / diffusion blowing time in step S13, and control with and without steps S14 to S16, that is, control in which the time in step S13 is maintained as it is and control shown in the present embodiment. And compared. The score is added in such a manner that the left term in the table is a positive number, the right term in the table is a negative number, and further, the intermediate value is “0” when the maximum value is changed from “−3” to “+3”. ". The points were given integers, and the test was performed with all subjects being seven and the experimental conditions not being known. However, all the subjects are experienced in such an air conditioning experiment, and the evaluations shown in the table have already been performed several times. The results shown in Tables 1 and 2 are simple averages of these evaluations.

As can be seen from the table, in the control without step S14 and subsequent steps, the evaluation word for evaluating “naturalness” has a considerably different value because the cycle is not a random cycle.

Next, a comparison was made between the case where the random ratio was controlled by the heat load and the case where the random ratio was controlled by a constant randomness without depending on the heat load. For this purpose, experiments were performed under two types of heat load conditions. Under the condition of low heat load, no significant difference appeared because both controls were substantially the same. On the other hand, under the condition of high heat load, as shown in Table 2, the control of the random blowing maintenance time happens to be a diffused blowing for a long time. The words resulted in different values.

From these effects confirmation experiments, it has been found that adjusting the constant and randomness of the fluctuation period due to the heat load as in the present embodiment has a remarkable effect.

As described above, in the embodiment of the present invention, since the randomness is adjusted by the heat load, a remarkable difference from the air conditioner in which the time for maintaining the air volume is controlled by the heat load is recognized. In other words, when the heat load is high, the maintenance time of the high air volume is lengthened and the maintenance time of the low air volume is shortened, and when the heat load is low, the maintenance time of the high air volume is shortened and the maintenance time of the low air volume is extended. The following differences are recognized.

First, even if the air flow or the wind speed at which the difference in height is given by the heat load is controlled, the transfer of heat between the human body and the conditioned air in a short time can be appropriately controlled,
It has nothing to do with the random feeling of wind speed. That is, the purpose is not to conduct heat as in the conventional air conditioner in which the time for maintaining the air volume is controlled by the heat load, but to aim at a psychological effect in this embodiment. For this reason, by increasing the sense of randomness under relatively low heat load conditions, it is possible to depart from mechanically repeated control and create an atmosphere as if it were in nature. It has an excellent effect of giving the occupants psychological satisfaction through a stimulating form of sexual exchange. In other words, the objective of improving the thermal environment of the passenger compartment and the occupants originally possessed by the air-conditioning wind and the contradictory objective of the psychological effect of naturalness that is partially inconsistent with certain thermal improvements are achieved. It has great features.

In the above-described embodiment, the blowing state is randomly switched between the concentration and the diffusion. However, the present invention is not limited to this. For example, the rotation speed of the blower fan itself can be randomly switched.

[Effects of the Invention] As is clear from the above, according to the configuration of the present invention,
Since the blowout mode is maintained alternately with the non-constant maintenance time, and the time width that increases or decreases when the non-constant maintenance time is determined is increased or decreased according to the increase or decrease of the heat load, the outlet is controlled. When the load is low, conditioned air close to natural wind can be obtained, and even when exposed to conditioned air for a long time, comfortable thermal sensation stimulus can be obtained, and comfort can be further improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of the present invention, FIG. 2 is a block diagram according to an embodiment of the present invention, FIG. 3 is a control flowchart based on FIG. 2, FIG. 4 to FIG. FIG. 7, FIG.
The figure is a graph for explaining the goodness of natural wind. 7 Blower fan, CL1 Blow-out port CL2 Indoor heat load detecting means CL3 First signal generating means CL4 Second signal generating means

Claims (1)

(57) [Claims] 1. An air outlet having a function of switching the blowing of conditioned air from a blower fan between a first blowing mode having a high wind speed and a second blowing mode having a low wind speed, and an indoor heat load detecting a heat load inside the vehicle. Detecting means for determining and outputting a constant maintenance time for alternately maintaining the air outlet in the first air outlet mode and the second air outlet mode at a constant cycle according to the detected vehicle interior heat load. A first signal generating means, and a non-constant maintenance time determined by increasing or decreasing a non-constant time width with respect to the constant maintenance time outputted by the first signal generating means, and detecting the increasing or decreasing time width. A second signal generating means for increasing or decreasing the heat load in accordance with an increase or a decrease in the heat load; and a control means for controlling the air outlet with an inconstant maintenance time outputted by the second signal generating means. Automotive air-conditioning control system.