JP2003011638A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly control a blowing air amount and blowing air temperature even when an air blowing mode is manually switched to a vent mode or a bi-level mode. SOLUTION: When the vent mode or bi-level mode is selected for the air blowing mode, at least either of the blowing air amount and blowing air temperature is set to equal to or below a set upper limit value. Then the set upper limit value is corrected based on a set temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner.

[0002]

2. Description of the Related Art In an air conditioner for a vehicle, for example, if the vent mode or the bi-level mode is manually switched during air conditioning in the vehicle in the heat mode, hot air is blown toward the occupant's face. . In this case, the occupant may feel uncomfortable and may adversely affect the driving. Therefore, the upper limit of the blast temperature is uniformly close to the body temperature (36
The temperature is controlled to ~ 38 ° C). However, when the inside air temperature is low such as in winter, the vent mode may be manually switched to warm the hand, so the above-mentioned upper limit value is not set.

[0003]

However, in the above-mentioned vehicle air conditioner, when the inside air temperature is high, for example, even if the vent mode is selected due to the necessity of warming the hands with snow scrapers or the like, the blast temperature is automatically adjusted. The upper limit value is suppressed to a constant value.
For this reason, the occupant is annoyed by the fact that he cannot fully warm his hands with the hot air and that it may be a malfunction.

Therefore, according to the present invention, even when the vent mode or the bilevel mode is manually switched,
It is an object of the present invention to provide a vehicle air conditioner that can appropriately control the amount of air blown and the temperature of air blown.

[0005]

As a means for solving the above problems, the present invention is a vehicle for controlling the amount of air blown into a vehicle and the temperature of air blown based on various conditions inside and outside the vehicle including a set temperature. In the air conditioner for air conditioning, when the vent mode or the bi-level mode is selected as the air blowing mode, at least one of the air blowing amount and the air blowing temperature is corrected based on the set temperature. It was done.

With this configuration, even if the vent mode or the bi-level mode is manually switched, the set upper limit value of the blown air amount or the blown air temperature is corrected according to the set temperature, so that a large amount of hot air is blown to the occupant. Problems such as discomfort and the inability to obtain warm air of a desired temperature do not occur.

Further, it is preferable that the set upper limit value is corrected based on the outside air temperature in addition to the set temperature. That is, if the outside air temperature is high, by correcting the set upper limit value downward, even if it is switched to the vent mode or the bi-level mode, the blast temperature or the blast amount is suppressed,
Reduces discomfort given to passengers. On the other hand, if the outside air temperature is low, the set upper limit value is corrected upward, and even if the set temperature is low, if the vent mode or the bi-level mode is switched, the blast temperature or the blast amount is increased to warm the passengers' hands, To meet the request of.

Further, it is preferable to correct the set upper limit value based on the inside air temperature in addition to the set temperature and the outside air temperature. That is, if the inside air temperature is high, the set upper limit value is corrected downward, while if the inside air temperature is low, the set upper limit value is corrected upward, so that the air temperature or the air blowing amount can be appropriately estimated by estimating the situation desired by the occupant. It is preferable because the value can be changed.

[0009]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a vehicle air conditioner according to this embodiment. In this vehicle air conditioner, the blower 2, the evaporator 3, and the
The air mix door 4 and the heater core 5 are sequentially arranged. The rotation speed of the blower 2 can be adjusted by switching the voltage applied to the blower motor 6 stepwise.
The evaporator 3 is connected in the middle of the refrigeration cycle. In the refrigeration cycle, the refrigerant discharged from the compressor 7 returns to the compressor 7 through the condenser 8, the throttle valve 9, the evaporator 3 and the accumulator 10 and circulates. In the air mix door 4, the amount of air passing through the heater core 5 is adjusted according to the opening degree of the air mix door 4. Heater core 5
Heats the passing air by flowing a part of the engine cooling water. Therefore, by changing the opening degree of the air mix door 4, the amount of heated air in the heater core 5 is adjusted, and then mixed with the air that has been cooled in the evaporator 3 to blow the air into the vehicle at a desired temperature. Is possible.

The applied voltage to the blower motor 6, the opening degree of the air mix door 4, etc. are detected signals from various sensors such as the inside air sensor 11, the outside air sensor 12, the solar radiation sensor 13 for detecting various conditions inside and outside the vehicle. Based on the controller 1
Drive control is performed by the control unit 4.

Next, the air conditioning control by the control unit 14 will be described with reference to the flowchart of FIG. In this embodiment, the heat (HEAT) is set by manual operation.
Mode, heat diff (H / D) mode or diff (DE
From F) mode to (VENT) mode or bilevel (B
/ L) is characterized in the air conditioning control when the mode is switched to.

That is, first, various conditions inside and outside the vehicle are read from the respective sensors and the like (step S1), and a target air temperature (opening degree of the air mix door 4) is calculated (step S).
2). Then, it is determined whether or not the control is manual control (step S3). If it is manual control, it is determined which blower mode is selected (step S4).

When the vent (VENT) mode or the bi-level (B / L) mode is not selected, that is, the heat (HEAT) mode, the heat differential (H / D) mode or the differential (DEF) mode is selected. Even if the blowing temperature is changed, it is determined that the blast temperature does not have an adverse effect on the occupant, and the calculated value in step S2 is used as it is. On the other hand, when the vent (VENT) mode or the bi-level (B / L) mode is selected, the inside air temperature becomes 1 based on the detection signal from the inside air sensor 11.
It is determined whether the temperature is 0 ° C. or higher (step S5).

When the inside air temperature is not higher than 10 ° C., that is, when it is necessary to warm the inside of the vehicle rapidly, even a vent (VENT) mode or a bi-level (B / L) mode is selected and hot air is blown out. Even if it does, it is determined that the occupant does not feel uncomfortable and the calculated value in step S2 is used as it is. On the other hand, the inside temperature is 10 ℃
When it is above, it is determined whether the set temperature is the maximum value (step S6).

When the set temperature is the maximum value, it is judged that the occupant positively desires the supply of hot air regardless of the air blowing mode and the inside air temperature, and the upper limit value of the air blowing temperature is not set. The calculated value in step S2 is used as it is.
On the other hand, when the set temperature is not the maximum value, the maximum value (set upper limit value) of the target air blowing temperature, that is, the determinable opening degree of the air mix door 4 is corrected based on the set temperature, the inside air temperature, and the outside air temperature (step S7). For example, when the outside air temperature is −10 ° C., FIG.
The set upper limit value (opening degree of the air mix door 4) is corrected according to the graph of In FIG. 3, when the set temperature is 22 ° C.,
When the inside air temperature is -10 to 5 ° C, the opening is 100%. Further, the opening degree is gradually reduced from 5 to 15 ° C. to gradually lower the set upper limit value of the blast temperature, and is set to 50% at 15 ° C. or higher. When the outside air temperature is other than −10 ° C., the set upper limit value is corrected according to another graph prepared according to the difference in the outside air temperature.

Here, the calculated value in step S2 is as shown in FIG.
It is determined whether or not the set upper limit value obtained from the graph is exceeded (step S8), and if the set upper limit value is exceeded, the set upper limit value is used as the target blowing temperature (step S9).

As described above, when the vent or bi-level mode is selected and the inside air temperature is 10 ° C. or higher, the set upper limit value of the blast temperature is corrected based on the set temperature, the inside air temperature and the outside air temperature. Therefore, unexpectedly, the problem that hot hot air is blown toward the passenger's face or the like does not occur. Even when the vent or bi-level mode is selected, if the inside air temperature is lower than 10 ° C., it is possible to cope with the case where the occupant warms the hand by blowing hot hot air. . That is, it is possible to predict the air temperature desired by the occupant to some degree and blow the air into the vehicle.

In the above embodiment, the target blast temperature,
That is, the air blowing temperature is adjusted by correcting the maximum value of the opening degree of the air mix door 4, but the air blowing amount may be adjusted by correcting the maximum value of the voltage applied to the blower motor 6. . That is, even if the blowing temperature is the same, by adjusting the blowing amount, it is possible to change the total amount of heat of the air supplied into the vehicle, and it is possible to make the sensible temperature experienced by the occupant appropriate.

In the above embodiment, the set upper limit value is
Although the correction is made based on the set temperature, the outside air temperature, and the inside air temperature, the correction may be made only based on the set temperature and the outside air temperature. For example, the opening degree of the air mix door 4 may be determined from the set temperature and the outside air temperature according to the graph of FIG. However, it is possible to perform more preferable air conditioning control for the occupant by considering the outside air temperature as in the above embodiment.

[0021]

As is apparent from the above description, according to the present invention, when the vent mode or the bi-level mode is selected, the set upper limit value of the blowing amount and / or the blowing temperature is corrected according to the set temperature. Since this is done, it becomes possible to perform appropriate air conditioning by predicting the air flow rate and / or air temperature desired by the occupant.

[Brief description of drawings]

FIG. 1 is a block of a vehicle air conditioner according to the present embodiment.

FIG. 2 is a flow chart showing the contents of calculation of a target blast temperature (opening degree of an air mix door).

[Fig. 3] Set temperature, inside air temperature, and outside air temperature (example)
3 is a graph showing the relationship between the value and the set upper limit value.

FIG. 4 is a graph showing a relationship between a set temperature and an outside air temperature and a set upper limit value.

[Explanation of symbols]

1 ... Air conditioning unit 3 ... Evaporator 4 ... Air mix door 5: Heater core 14 ... Control device

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B60H 1/12 641 B60H 1/12 641A (72) Inventor Tetsuo Araya 3-11 Yoshikawa Industrial Park, Higashihiroshima City, Hiroshima Prefecture Formula company Japan Climate Systems F term (reference) 3L011 AF02 AP02 AU00

Claims (3)

[Claims] 1. A vent mode or a bi-level mode is selected as a ventilation mode in an air conditioning system for a vehicle in which the amount of ventilation and the temperature of ventilation are controlled based on various conditions inside and outside the vehicle including set temperatures. In this case, the vehicle air conditioner is characterized in that a set upper limit value of at least one of the blown air amount and the blown air temperature is corrected based on the set temperature. 2. The vehicle air conditioner according to claim 1, wherein the set upper limit value is corrected based on an outside air temperature in addition to the set temperature. 3. The vehicle air conditioner according to claim 2, wherein the set upper limit value is corrected based on an inside air temperature in addition to the set temperature and the outside air temperature.