JPH03197230A - Air conditioner control device for automobile - Google Patents

Abstract

PURPOSE:To obtain the conditioned air near natural wind and comfortable warm or cool feeling stimulation by controlling the diffusing mode of a diffuser outlet on the basis of the predetermined cycle, and the degree of random mode selection increasing or decreasing in reverse proportion to a thermal load. CONSTITUTION:A diffuser outlet CL1 is so constituted as to be capable of selecting the diffusion of the conditioned air from a blower fan 7 at first and second diffusion modes respectively giving different air velocity at a high or low level. On the other hand, a thermal load in a cabin is detected with a cabin thermal load detection means CL2. Also, the first signal for selecting the outlet CL1 at either of the aforesaid modes according to the predetermined cycle is outputted from the first signal generation means CL3. Furthermore, the second signal for randomly selecting the aforesaid diffusion modes, and increasing or decreasing the degree of the random selection, depending upon the cabin thermal load is outputted from the second signal generation means CL4. The diffuser outlet CL1 is controlled with a control means 5 on the basis of the generated first and second signals and a detected cabin thermal load.

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 vehicle interior of an automobile.

(Prior art) As a conventional air conditioning control device for automobiles, for example, Japanese Patent Laid-Open No. 56
There is one described in No.-86814. This device is configured to switch and control the blowing of air conditioned air from the blower outlet between a continuous blowing state in which air is blown out continuously and an intermittent blowing state in which air is blown out intermittently, depending on the temperature difference between the detected room temperature and the set room temperature. ing.

In other words, this air conditioning control device improves comfort by continuously blowing conditioned air to the occupants when the detected room temperature is higher than the set room temperature by a predetermined value, and when the detected temperature is sufficiently close to the set room temperature. By intermittently blowing air-conditioned air to passengers, the system eliminates discomfort caused by being too cold.

(Problem to be solved by the invention) However, in this type of air conditioning control device, when the detected temperature is sufficiently close to the set room temperature, conditioned air is only intermittently blown out to the occupants. For example, if the heat load is a little lower than the set room temperature, changing the wind speed can be rather bothersome.

In response to this, the present applicant has proposed an air conditioning control device for automobiles that switches between a high wind speed blowout mode and a low wind speed blowout mode according to changes in the amount of solar radiation, and makes the maintenance time of each variable variable. (Japanese Patent Application No. 62-323372) In this way, the control that changes the maintenance time of the blowing mode according to changes in the amount of solar radiation enables more appropriate control than the conventional example described above, but as the amount of solar radiation decreases, changes in wind speed are bothersome. becomes.

The applicant of the present application has also proposed an air conditioning control system for an automobile (Japanese Patent Application No. 19362/1982) which uses a diffuse blowing mode with a low wind speed when the detected room temperature approaches the set room temperature sufficiently. However, if the diffuse blowing mode with low wind speed continues for a long time, the stimulation of the wind speed will be lost, and there is a possibility that the sense of comfort will decrease.

This is because without the stimulation of wind speed, the temperature interval between the passenger's skin becomes numb. For this reason, occupants operate to increase the wind speed or volume, but if the wind speed or volume is increased for a long time, the amount of heat transferred from the skin becomes excessive, causing problems such as becoming cold and uncomfortable. there were.

For these reasons, when the heat load inside the vehicle is relatively high, the occupants sweat a lot, so it is desirable to evaporate the sweat generated regularly, and when the heat load is low, there is little perspiration and the wind speed changes. It can be said that it is desirable to have a change that is not bothersome, that is, a change that is closer to the natural wind.

Now, to explain the advantages of natural wind, they are quite different, as shown in Figures 7 and 8.

In these figures, the horizontal axis represents frequency and the vertical axis represents power spectrum in logarithmic form. These figures are diagrams showing the strength of each of the various frequencies contained in the wind.

From Figure 7, natural wind has large low frequency components and small high frequency components. Also, from FIG. 8, it can be seen that the difference in magnitude between the low frequency component and the high frequency component of the wind from the electric fan is small. From this, it can be said that natural winds basically change slowly, and that changes over short periods of time overlap based on these slow changes.

In general, natural wind is suitable for humans because this slow-moving component produces appropriate fluctuations within a range that is not large and bothersome.

Therefore, an object of the present invention is to provide an air conditioning control device for an automobile that can approximate natural wind as much as possible under conditions of low heat load and further improve comfort.

[Structure of the invention] (Means for solving the problem) In order to solve the above problem, this invention has the following features as shown in FIG.
An air outlet CLI having a function of switching the air conditioned air from the blower fan into a first air blowing mode with a high wind speed and a second air blowing mode with a low wind speed, and an indoor heat load detection means CL2 that detects the heat load in the vehicle interior. and a first signal generating means CL3 that outputs a signal for switching the air outlet CL1 between the first air blowing mode and the second air blowing mode at a predetermined cycle, and a first signal generating means CL3 that outputs a signal that switches the air outlet CL1 substantially randomly and in response to an increase or decrease in heat load. a second signal generating means CL4 that increases or decreases the degree of randomness, and calculates the outputs of the first and second signal generating means and the output from the indoor heat load detecting means CL2 to control the air outlet CL1. The configuration includes a control means CL5 to perform the control.

(Function) According to the above configuration, when the detected heat load is high, the degree of randomness from the second signal generating means is reduced and the signal from the first signal generating means is used to switch between the first blowing mode and the second blowing mode. can be switched at a predetermined cycle. Furthermore, when the detected thermal load decreases, the degree of randomness by the second signal generating means CL4 can be increased to make it more similar to natural wind.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows a configuration diagram according to an embodiment of the present invention, and the vehicle of this embodiment is equipped with an air conditioning unit 1 in a vehicle instrument. This air conditioning unit 1 is equipped with a proa fan 7 on the downstream side of an intake door 5 that selectively switches the air intake hole 3 from the vehicle interior or outside the vehicle interior. On the downstream side of the proafan 7, there is an evaporator 9 that introduces refrigerant from a refrigeration cycle consisting of a compressor, a condenser, an expansion valve, etc. (not shown), and cools the blown air through it.
It is provided with a heater core 11 which introduces engine cooling water (not shown) and heats the blown air by the heat generated by the coolant. The heater core 11 includes an air mix door 13 that adjusts the ratio of air passing through the evaporator 9 introduced into the heater core 11 to adjust the temperature.

The temperature-adjusted air conditioned air is blown out from the vent outlet 15, which is the outlet CLI, and the foot outlet 17 to control the inside of the vehicle at an appropriate temperature.

Further, the vent outlet 15 can be switched between a concentrated blowout mode, which is a first blowout mode with a high wind speed that concentrates the blowout airflow in the direction of the target occupant, and a diffused blowout mode, which is a second blowout mode with a low wind speed that diffuses the airflow throughout the vehicle interior. It has functions. That is, on the front side of the instrument there is a wind direction setting device 37, 39, 4 which directs the air conditioned air from the vent outlet 15 towards the occupants of the front seat 35 by controlling the wind direction louver.
1°43 is provided, and the wind direction can be set to the front seat occupant and above the head of the front seat occupant, and the mode can also be switched. (For example, refer to the applicant's earlier application No. 125502/1983) The intake door 5 is rotated by an intake door drive device 19, the pro-a fan 7 is rotationally driven by a pro-a fan motor 21, and the air mix door 13 is rotated by a pro-a fan motor 21. is rotated by the air mix door drive device 23.

The vent outlet 15 is equipped with a vent door 25, and the vent door 25 is rotated by a vent door driving device 27. Further, the foot air outlet 17 is provided with a switching door 31 that switches air blowing between the defroster air outlet 29 of the foot air outlet 17, and this switching door 31 is connected to a switching door driving device 33.
rotated by.

Further, an outside temperature detector 45 for detecting the outside temperature and a solar radiation amount detector 47 for detecting the amount of solar radiation are provided at appropriate positions outside the vehicle interior. Furthermore, a room temperature detector 49 as an indoor heat load detection means CL2 for detecting the heat load in the vehicle interior together with the solar radiation amount detector 47 and a room temperature setting device 51 for setting the indoor temperature are provided at an appropriate position in the vehicle interior. It is being

The signals detected by the valley detectors 47 to 49 and the signals set by the setting device 51 are input to the microcomputer 53 as the control means CL5, and the microcomputer 53 drives the drive devices 19.23, 27.3.
3 and the proafan drive device 21.

Next, the operation of this embodiment will be explained using the control flowchart shown in FIG.

When the A/C switch is turned on after the key switch is turned on, first, in step S1, the initial setting of the multiplier used in this control flowchart is performed. That is, the target blowing temperature T.

Multipliers A to E used in the calculation formula of P', FGH used in the calculation formula of air mix door opening degree X, and L used in heat load calculation
This is a set of 1 to L3.

Next, in step S2, the outside temperature TA9A detected by the outside temperature detector 45, the solar radiation S detected by the radiation amount detector 47, the room temperature TIC detected by the room temperature detector 49, and the settings set by the room temperature setting device 51. Each data such as room temperature T5E1 is read.

In step S3, in order to control the air volume of the pro-fan 7 by the applied voltage, the pro-apan applied voltage Via is determined based on the difference (Tic Tsit) between the room temperature TIC and the set room temperature T387. is set. Specifically, the larger this deviation is, the more the applied voltage is increased and the air volume is increased to lower the room temperature T1c.
is brought closer to the set room temperature TsET.

Next, in step S4, the outside temperature TA, the room temperature TIC+
Target air temperature T using constants A to E from solar radiation amount S and set room temperature T SET. P. is calculated, and further, the air mix door opening degree X is calculated from this target blowout temperature Top. using constants F to H (Stip S5).

Next, in step S6, the target blowing temperature T is determined. 1. The blowout mode is calculated based on. That is, the target blowing temperature T. If F′ is high, it is heater mode (foot blowout), and if it is medium, it is pie level mode (vent and foot blowout).
, if it is low, it is in vent mode (vent blowing).

In step S7, the blowing mode is determined, and if it is the vent mode, the process moves to step S8, and if not, the process moves to step S17.

In step S8, the room temperature TIC is compared as a set amount having a hysteresis of 27°C to 28°C. Here, if the room temperature is T
If the IC was previously 29°C and is currently 27.2°C, it is on the upper line of hysteresis as shown in the diagram, and this state can be described as "
This will be referred to as the "ON" state. Similarly, if the temperature was previously 23°C and is currently 27.5°C, it is on the lower line of hysteresis as shown in the figure, and this state will be referred to as rOFFJ.

And to change from ON state to OFF state, room temperature T+c is 2
Must be below 7°C. Similarly, in order to change from the OFF state to the ON state, the room temperature TIC must exceed 28°C.

Note that quantities having hysteresis will also appear in the following explanation, but since they all have the meaning explained here, detailed explanation thereof will be omitted.

If it is in the ON state here, it moves to step S10 and turns OFF.
In this state, the process moves to step S9.

In step S9, the amount of solar radiation S is set to 400 KcaJl/m2h.
This is compared with a set amount having a hysteresis of 400 Kcal/m'h. Here, the amount of solar radiation is larger than the set value and O
If it is in the N state, the process moves to step S12, and if it is in the OFF state, the process moves to step Sll.

In step S10, the central fixed blowing mode is set.

In other words, the air outlet is fixed to the concentrated air blowing mode, and when the temperature inside the vehicle is high, the conditioned air is blown intensively to the occupants to improve comfort. Further, in step S11, the diffusion fixed blowout mode, that is, the blowout port is fixed to the diffusion blowout mode. Therefore, when the temperature inside the vehicle is low and the amount of solar radiation is low, the wind speed is reduced to prevent excessive cooling and improve comfort.

In step S12, the heat load is calculated from the room temperature T1c and the amount of solar radiation S. The calculation results of this heat load are adjusted so that they are distributed in the range of 0 to 1. If it is less than 0, it is reset to 0, and if it is more than 1, it is reset to 1. .

In step S13, a variable air blowing mode is set in which concentrated blowing mode and diffused blowing mode are alternately repeated. For this purpose, a constant period tc is determined depending on the heat load.

This determination is made by the microcomputer 53, so in this embodiment, the microcomputer 53
3 constitutes a first signal generating means CL3 that outputs a signal for switching the air outlet between the first air blowing mode and the second air blowing mode at a predetermined period. Here, the higher the heat load, the longer the concentrated blowing time and the shorter the diffused blowing time. In other words, by increasing the duration of high wind speed, the air conditioning air can cool the occupants more. On the other hand, when the heat load is low, excessive cooling by the conditioned air is prevented by increasing the duration of the conditioned air at a low wind speed. In this example, the concentrated blowing time is set to 0 when the heat load is around 0, and is set to increase as the heat load increases. When the heat load exceeds 1, the time is set to 100 seconds, but in reality, the heat load does not exceed 1, so the maximum time limit is 20 seconds.

Similarly, the time for diffusion blowing is 100% under low heat load conditions.
A long time of seconds is set, but as the heat load increases, the time becomes shorter and finally 10 seconds becomes the minimum time.

In the concentrated blowing mode, a concentrated blowing/phosphorus maintenance time is used, and in the diffused blowing mode, a diffused blowing maintenance time is used.

Next, in step S14, a random period t is generated.

Output. In this example, the constant cycle time tc set earlier
And then half the time.

In step 15, a random ratio α is generated.

This α is an arbitrary value in the range of −1 to 1 that is randomly generated without bias.

In step S16, a constant period tc and a random period t,
The correction period t is calculated using the random ratio α. The maintenance time of the concentrated blowing mode and the diffused blowing mode is set using the period t thus calculated.

These random settings are performed by the microcomputer 53, and in this embodiment, the microcomputer 53
constitutes a second signal generating means CL4 which outputs a signal for switching the blowing mode substantially randomly and also reduces the degree of randomness in accordance with an increase in heat load.

In step S17, the set voltage for the air volume of the proa fan 7 determined in step S3 is output to the proa fan motor 21.

Step S18 is the drive device 19, 23.27 for each door.
．． 33 and perform door settings.

With this kind of 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 becomes high, the concentrated blowing time is lengthened and the random ratio is decreased to adjust the wind speed. The periodic air conditioned air improves comfort. In addition, under conditions where the amount of solar radiation is low and the heat load is low, the diffusion blowing time is lengthened and the random ratio is increased to create a slow conditioned air that is close to natural wind where changes in wind speed can be felt, making it more comfortable. be able to improve.

To further explain with reference to FIG. 4, FIG. 4 shows a comparison between the differences due to the magnitude of the heat load and the differences due to the presence or absence of randomness as a function of time changes in the blowing mode.

First, when there is no randomness and the heat load is small, the diffused blowing time becomes considerably longer than the concentrated blowing time (FIGS. 4(a) and 4(C)). On the other hand, when the heat load is large, the concentrated blowing time and the diffused blowing time are approximately the same (Fig. 4 (C), Fig. 4 (d)). Next, when there is randomness, the heat load is small. On the other hand (Fig. 4 (ω)
, when the heat load is large (FIG. 4(b)), the degree of randomness becomes smaller.

In other words, random changes are close to constant periodic changes. This random ratio changes depending on the heat load, so that when the heat load is high, the amount of sweat is appropriate.The intensive blowing mode with high wind speed and the diffuse blowing mode with low wind speed both take an abnormally long time. Try not to do that. This can prevent problems such as long periods of high wind speed that make you feel cold, and long periods of low wind speed that cause you to sweat and make you feel hot.

On the other hand, when the heat load is low, by varying the time of the blowout mode with low wind speed, the slow cycle similar to natural wind is made to have a large effect.

Furthermore, the applicant of the present invention conducted an experiment to understand the extent of the effect of this embodiment, and the results are shown in Tables 1 and 2 of FIGS. 5 and 6. In this experiment, the following two types of experiments were compared using the same experimental facility and the same heat load conditions. In other words, a common control method is used until the concentration/diffuse blowing time is determined in step 313, and steps S14 to S16 are used.
A comparison was made between control with and without step 313, that is, control in which the time of step 313 is used as the maintenance time, and control shown in this embodiment. In order to assign points, the terms on the left side of the table should be positive numbers, the terms on the right side should be negative numbers, and the maximum value should be between ``-3'' and ``+3''. ” The scores are given so that Points were given as integers, and the experiment was conducted with seven subjects in total without knowing anything about the experimental conditions. However, all of the subjects had experience with such air conditioning experiments and had already experienced the evaluations shown in the table several times. The results shown in Tables 1 and 2 are simple average values of these evaluations.

As can be seen from this table, in the control that does not occur after step S14, the evaluation word for evaluating "naturalness" has considerably different values because the period is not random.

Next, we compared the case where a random ratio was controlled by heat load and the case where it was controlled by a constant random difference without depending on heat load. For this purpose, experiments were conducted under two types of heat load conditions. Under conditions of low heat load, both controls were approximately the same, so no meaningful difference appeared. On the other hand, under conditions of high heat load, as shown in Table 2, if the blowing duration is controlled randomly, the blowing will be diffused for a long time.
The evaluation words for ``feeling uncomfortable,'' ``feeling comfortable,'' and ``dynamic'' resulted in different values.

From these effect confirmation experiments, it was found that adjusting the uniformity and randomness of the fluctuation period due to heat load as in the present example has a remarkable effect.

In this way, the embodiment of the present invention adjusts the randomness according to the heat load, and therefore, it is recognized that the effect is significantly different from that of an air conditioner in which the air volume maintenance time is controlled by the heat load. In other words, when the heat load is high, the time to maintain high air volume is lengthened and the time to maintain low air volume is shortened, and when the heat load is low, the time to maintain high air volume is shortened and the time to maintain low air volume is lengthened. The following differences are recognized.

First, controlling the air volume or wind speed, which varies in height depending on the heat load, can appropriately control the transfer of heat between the human body and the air conditioned air in a short period of time, but the randomness of the air volume and wind speed, which is typical of natural wind, may occur. is unrelated. In other words, the purpose of this embodiment is not to transfer heat as in conventional air conditioners that control the air volume maintenance time by heat load, but to achieve a psychological effect. For this reason, by increasing the sense of randomness under relatively low heat load conditions, we can move away from mechanically repeated control and create an atmosphere as if we were in nature. It has the excellent effect of giving passengers a sense of psychological satisfaction through the stimulation of giving and receiving. In other words, the objective of air-conditioned air, which is originally intended to improve the thermal environment of the vehicle interior and passengers, and the contradictory objective of the psychological effect of naturalness, which is partially contradictory to a certain level of thermal improvement, have been achieved. It has great characteristics.

In the above-mentioned embodiment, the blowing state was randomly switched between concentration and diffusion, but the invention is not limited to this, and for example, the rotational speed of the proa fan itself may be switched randomly.

[Effects of the Invention] As is clear from the above, according to the configuration of the present invention, the air outlet is controlled by using a predetermined period and degree of randomness in the blowout mode, and increasing the degree of randomness as the heat load decreases. While controlling, when the heat load is low, it is possible to obtain conditioned air close to natural wind, and even when exposed to conditioned air for a long time, it is possible to obtain a comfortable thermal sensation stimulation, further improving comfort. I can do it.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the present invention, Fig. 2 is a block diagram of an embodiment of the present invention, Fig. 3 is a control flowchart based on Fig. 2, Figs. Figure 7, 8th
The figure is a graph to explain the benefits of natural wind. 7... Proafan CLl... Air outlet CL2...
- Indoor heat load detection means Cl3...first signal generation means Cl4...second signal generation means

Claims (1)

[Claims] The air-conditioned air from the blower fan is
an air outlet having a function of being able to switch between an air blowing mode and a second air blowing mode with a lower wind speed; an indoor heat load detection means for detecting a heat load in the vehicle interior;
a first signal generating means for outputting a signal for switching between the blowout mode and the second blowout mode; and a second signal generating means for outputting a signal for switching substantially randomly and decreasing or increasing the degree of randomness according to an increase or decrease in heat load; , said first and second
An air conditioning control device for an automobile, comprising: a control means for calculating the output of the signal generating means and the output from the thermal load detecting means to control the air outlet.