JP2000233629A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a feeling of heating for a rear seat occupant. SOLUTION: A rear seat blow air duct 2 for feeding warm air to a rear seat occupant is provided with its side of the downstream branching into a lower duct 4 supplying warm air to a foot of the rear seat occupant and an upper duct 5 supplying warm air in the vicinity of a knee part of the rear seat occupant, and a damper for adjusting proportion of air amounts, flowing in the lower/upper ducts 4, 5, is equipped. A damper opening in a side of the upper duct 5 is decreased to reduce a blow air amount of a seat back surface blow outlet 5a when a water temperature is lower than a first preset water temperature, and a damper opening in a side of the upper duct 5 is gradually increased to increase a blow air amount of the seat back surface blow outlet 5a until the water temperature leads to a second-preset water temperature higher than the first preset water temperature. In this way, a cool air feeling by blowing air of low temperature in the vicinity of knee part of the rear seat occupant can be reduced, thereafter a blow air amount of the seat back surface blow outlet 5a is increased with a rise of water temperature, so as to obtain a feeling of heating in the vicinity of a knee part.

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 capable of supplying warm air to the vicinity of a knee of a rear occupant from a rear seat outlet opening at the back of a front seat back.

[0002]

2. Description of the Related Art As a conventional technique, for example, Japanese Utility Model Laid-Open No. 555-1
There is an air distribution device for vehicle air conditioning disclosed in Japanese Patent Application Publication No. 06108. This device includes a knee air distribution duct so that air can be distributed not only near the feet of the rear passengers but also near the knees. The knee air distribution duct is branched and connected to a foot air distribution duct for supplying warm air near the feet of the occupant, and a knee air distribution duct is provided from an air outlet of the foot air distribution duct (hereinafter, a foot air outlet). (Hereinafter referred to as knee outlet) is provided at a higher position.

[0003]

However, the above-mentioned conventional apparatus does not have, for example, means for opening and closing the knee air distribution duct (the knee air outlet is always open). Even in the early stage of heating when the temperature of engine cooling water is low, low-temperature air is blown out from both the foot outlet and the knee outlet. As a result, since the low-temperature wind also hits the vicinity of the knees of the rear seat occupant, there is a problem that a feeling of cool air at the knees is increased and it is uncomfortable. The present invention has been made based on the above circumstances, and an object of the present invention is to provide a vehicle air conditioner that can improve the heating feeling of a rear passenger.

[0004]

According to the present invention, there is provided an air flow rate adjusting means for adjusting a ratio of an air flow blown from a foot outlet and an air flow blown out from a seat back outlet. The ratio of the amount of air blown out from the foot outlet and the amount of air blown out from the seat back outlet can be adjusted so that a more comfortable heating feeling for the rear seat occupant can be obtained.

A transient state from the start of the heating operation until the blow-out temperature becomes substantially stable is determined. In the transient state, the amount of air blown out from the seat back outlet is set in advance. The air volume ratio adjusting means is controlled so as to be smaller than the set air volume. Thereby, it is possible to suppress the feeling of cool wind caused by blowing out low-temperature air to the vicinity of the knees of the rear passengers in the early stage of heating.

(Means of Claim 3) The direction of the wind direction plate provided in the seat back outlet is controlled to change the blown air blown out from the seat back outlet between the diffused state and the concentrated state. In this case, since the feeling of heating is different between when the blown air is diffused and when it is concentrated, a more comfortable heating feeling can be obtained. It is to be noted that a wind direction plate may be provided not only at the seat back outlet but also at the foot outlet, and control may be performed in the same manner as the wind direction plate provided at the seat back outlet.

(Means of Claim 4) At the beginning of the transient state,
The wind direction plate is controlled so as to diffuse the blown air blown out from the seat back outlet. In this case, by diffusing the blowing air, it is possible to prevent low-temperature air from intensively hitting the vicinity of the knees of the rear seat occupant, so that it is possible to reduce the feeling of cool air at the knees at the beginning of heating.

According to a fifth aspect of the present invention, the direction of a wind direction plate provided at a seat back outlet is controlled in accordance with the inclination of a front seat back. In this case, even if the inclination of the front seat back changes, the direction of the wind direction plate is changed according to the inclination, so that the blown air blown out from the rear outlet of the seat always hits near the knees of the rear passengers. Can be.

In the transient state of the heating operation, the temperature of the air blown into the vehicle compartment sharply rises. Therefore, the transient state can be determined based on a physical quantity correlated with the temperature of the air blown. Therefore, as the physical quantity, a signal of at least one of a temperature of engine cooling water as a heat source for heating, a temperature in a vehicle compartment, and a target outlet temperature can be used.

[0010] (Means of the present invention) When the blown air blown from the seat back outlet is lower than a predetermined temperature, the blowout air from the seat back outlet is stopped by the air flow rate adjusting means. As a result, it is possible to prevent a feeling of cold wind at the knees of the rear passenger.

(Eighth Means) In the vehicle air conditioner according to the seventh aspect, the predetermined cold can be determined by the temperature of air blown from the air conditioning unit. Specifically, as described in claim 9, when the temperature of the air blown from the air conditioning unit is 50 ° C. or lower, it is determined that the temperature is lower than the predetermined cold.

According to a tenth aspect of the present invention, in the vehicle air conditioner, the predetermined coldness can be determined based on a target air temperature controlled by the air conditioning unit. Specifically, as described in claim 11, the target blowing temperature 5
When the temperature is 0 ° C or lower, it is determined that the temperature is lower than a predetermined value.

(Claim 12) In the vehicle air conditioner according to claim 7, the predetermined coldness can be determined by the temperature of air blown from the seat back air outlet. Specifically, as described in claim 13, when the blowing temperature from the seat back outlet is 40 ° C or lower, it is determined that the temperature is lower than the predetermined cold.

(Claim 14) In the vehicle air conditioner according to the present invention, the predetermined coldness can be determined by the temperature of the engine cooling water which is a heat source for heating. Specifically, when the temperature of the engine cooling water is 60 ° C. or lower, it is determined that the temperature is lower than a predetermined value.

(Claim 16) In the vehicle air conditioner according to the present invention, the predetermined cold can be determined by a feeling of warmth of the occupant.

[0016]

Next, an embodiment of the present invention will be described with reference to the drawings. (First Embodiment) FIG. 1 is a perspective view showing a structure for distributing air to rear passengers. The air conditioner for a vehicle according to the present embodiment is shown in FIG.
As shown in (a), a rear air duct 2 for sending warm air obtained by the existing front air conditioning unit 1 to a rear passenger.
Is provided. The front air-conditioning unit 1 includes a blower 3 for sending air into the vehicle interior, and incorporates a well-known heater core (not shown) using the engine cooling water as a heat source. The heater core exchanges heat with the engine cooling water. The heated air is supplied to the rear seat ventilation duct 2.

The rear-seat ventilation duct 2 is provided with its downstream side branched off into a lower duct 4 and an upper duct 5, and adjusts the ratio of the amount of air flowing to the lower duct 4 to the amount of air flowing to the upper duct 5. Is provided. The lower duct 4 has a foot outlet 4a that opens toward the foot of the rear occupant, and can blow air to the foot of the rear occupant from the foot outlet 4a. The upper duct 5
It has a seat back outlet 5a which opens to the back of the front seat back 7, and air can be blown out from the seat back outlet 5a to the vicinity of the knees of the rear passenger. The upper duct 5 is provided inside the front seat back 7. The lower duct 4 is provided with a passage cross-sectional area larger than that of the upper duct 5 so that a larger air volume can be obtained than the upper duct 5 (for example, the lower duct 4 is larger at a ratio of 6: 4).

A damper 6 provided in the rear air duct 2
As shown in FIG. 1B, is provided at a branch point between the lower duct 4 and the upper duct 5, for example, and is driven by a servomotor 9 via a link mechanism 8. Servo motor 9
Is controlled by an air conditioner control device (not shown) for controlling the air conditioning state of the vehicle interior. The air conditioner control device calculates a target outlet temperature (TAO) from, for example, a set temperature, an inside air temperature, an outside air temperature, an amount of solar radiation, and the like, and controls the operation of various air conditioners based on the target outlet temperature.

Next, the operation of this embodiment will be described. The warm air supplied from the air conditioning unit 1 to the rear air duct 2 is supplied to the lower duct 4 and the upper duct 5 according to the operating position of the damper 6.
Air flowing through the lower duct 4
a, the air flowing through the upper duct 5 is blown out from the rear seat outlet 5a to the vicinity of the knees of the rear seat occupant. Here, if the temperature (water temperature) of the engine cooling water, which is the heat source of the heater core, is not sufficiently increased, the air exchanged at that temperature is blown out from the rear outlet 5a to the vicinity of the knees of the rear passenger. Then, since the blowing wind is cold, the knees feel cold.

Therefore, in this embodiment, the operation of the damper 6 is controlled based on the characteristic diagram shown in FIG. That is, when the water temperature Tw is lower than the first set water temperature Tw1, the damper opening on the upper duct 5 side is reduced as much as possible as shown in FIG. The amount of blown air is suppressed to P1% (for example, about 10%) of the whole. At this time, the amount of air blown out from the foot outlet 4a is (100-P
1) It goes without saying that it is%. The first set water temperature Tw1 is a water temperature (for example, about 60 ° C.) in the initial state of the transient state from the start of the heating operation until the blowout temperature becomes substantially stable. Is a temperature that cannot be obtained.

Thereafter, the water temperature Tw is changed to the first set water temperature Tw1.
Until a higher second set water temperature Tw2 is reached, FIG.
As shown in (b), the opening degree of the damper on the side of the upper duct 5 is gradually (or stepwise) increased to increase the amount of air blown out from the seat back outlet 5a (P1 → P2). The second set water temperature Tw2 is the water temperature in the latter half of the transient state (for example, about 80 ° C.). If the air is heat-exchanged at this water temperature, a feeling of heating can be obtained.

Further, after the water temperature Tw exceeds the second set water temperature Tw2, as shown in FIG.
And the damper opening of the lower duct 4 is set to 100%, and the blow-out air volume of the seat back outlet 5a is maintained at P2% (for example, 40%) of the whole. When the damper opening of the upper duct 5 and the lower duct 4 are both set to 100%, the air volume ratio between the upper duct 5 and the lower duct 4 is determined according to the passage cross-sectional area of each duct. Therefore, in this embodiment, since the lower duct 4 has a larger passage cross-sectional area than the upper duct 5 as described above, the foot outlet 4a has a larger blow-off air volume than the seat back outlet 5a.

(Effects of the First Embodiment) In the present embodiment, since the amount of air blown out from the outlet 5a at the rear of the seat is kept low at the beginning of the transition of the heating operation (Tw <Tw1), low-temperature air flows to the rear passenger. The feeling of cool wind caused by blowing out to the vicinity of the knee can be suppressed. Thereafter, by increasing the amount of air blown out from the seat back outlet 5a with the rise of the water temperature, a feeling of heating near the knee can be obtained, and the feeling of heating can be improved in the entire region during the transition of the heating operation.

(Second Embodiment) This embodiment is an example in which, in addition to the control of the first embodiment, the direction of the blown air blown out from the seat back outlet 5a is controlled. As shown in FIGS. 3 and 4, the seat back outlet 5a is provided with a guide plate 10 for changing the direction of the blown air in the vertical direction. The guide plate 10 is driven by a servomotor 12 via a link mechanism 11, and changes the blown air blown out from the seat back outlet 5a between the diffused blowout and the concentrated blowout as shown in FIG. Can be. In FIG. 4, (a) shows diffusion blowing, (b) shows intermediate blowing, and (c) shows concentrated blowing.

In the operation of the present embodiment, the blowing air blown out from the seat back air outlet 5a is set as the diffusion blowing at the initial stage of the transient time of the heating operation (Tw <Tw1), and thereafter, the diffusion blowing → intermediate as the water temperature rises. Change from blowing to concentrated blowing. Thereby, in the initial stage of the transition of the heating operation, the blown air (low-temperature air) blown out from the seat back air outlet 5a can be diffused, so that the low-temperature air can be prevented from intensively hitting the vicinity of the knee. Therefore, the feeling of cold near the knee can be further reduced. Thereafter, the warmed air can be intensively applied to the vicinity of the knee by changing the blown air from the seat back air outlet 5a in accordance with the rise of the water temperature to diffuse blowing → intermediate blowing → concentrated blowing. Therefore, the feeling of heating near the knee can be further enhanced.

Further, when the transient state approaches a steady state (a state in which the blow-out temperature is substantially stable), the blow-out wind from the seat back blow-out port 5a is changed from concentrated blow-out, intermediate blow-out, and diffused blow-out. Thereby, it is possible to prevent the warm air from intensively hitting the vicinity of the knee, and it is possible to obtain a more comfortable heating feeling. Especially in the steady state,
Guide plate 1 according to heat load (eg, solar radiation, outside air temperature)
The direction of 0 may be controlled. For example, when the amount of solar radiation is large or the outside air temperature is high, the blowing wind is changed between the intermediate blowing and the diffuse blowing, and when the amount of solar radiation is small or the outside air temperature is low, the blowing wind is concentrated with the intermediate blowing. Vary between blowing.

When the state of the blowing air (diffuse blowing, intermediate blowing, concentrated blowing) is changed, if the guide plate 10 is suddenly operated, the state of the blowing wind changes abruptly.
The occupants may feel uncomfortable. Therefore, when changing the state of the blowing air, it is better to control the operation of the guide plate 10 gently. In the present embodiment, the seat back outlet 5a
An example in which the guide plate 10 is controlled has been described. However, a guide plate may also be provided in the foot outlet 4a and control may be performed in the same manner as the guide plate 10 of the seat back outlet 5a.

(Third Embodiment) FIG. 5 is a plan view of the back side of the front seat back 7. This embodiment shows an example in which the direction of the guide plate 10 is corrected in accordance with the inclination of the front seat back 7 with respect to the control of the second embodiment. That is, when the inclination of the front seat back 7 changes, the direction of the blown air blown out from the seat back outlet 5a necessarily changes. For this reason, especially when the blowing wind is concentrated blowing, when the inclination of the front seat back 7 changes, the blowing wind comes off from the vicinity of the knee.

Then, as shown in FIG. 5, a servo motor 13 for operating the seat back for operating the front seat back 7 and a servo motor 12 for operating the guide plate 10 are connected by a harness 14, and a servo motor is provided. The direction of the guide plate 10 is controlled based on information from the motor 13 (the inclination of the front seat back 7). Thereby, even if the inclination of the front seat back 7 changes, it is possible to always blow the air blown out from the seat back outlet 5a to the vicinity of the knee. In the case of this embodiment, as shown in FIG. 6, the guide plate 10 and the servo motor 13 for seat back operation are connected by a link mechanism 15, and the servo motor 13 (without using the servo motor 12). The guide plate 10 may be driven.

(Fourth Embodiment) FIG. 7 is a perspective view showing a structure for distributing air to rear passengers. This embodiment shows an example in which an existing rear vent duct 17 provided in a center console 16 is used. As shown in FIG. 7, in a vehicle in which a rear vent duct 17 for supplying cool air to a rear passenger is already arranged in center console 16, warm air is supplied to rear vent duct 17 only during heating operation. May be configured. In this case, FIG.
As shown in (a), the lower vent 4 and the upper duct 5 are branched and connected to the rear vent duct 17 and the dampers 6 are arranged at the branch points, respectively, so that the feet and knees of the rear passenger are near. Hot air can be supplied to In addition,
As shown in FIG. 8B, a fan 18 for blowing the rear seats may be provided inside the rear vent duct 17. As a result, the air volume to the rear passenger can be increased.

(Fifth Embodiment) This embodiment is an example in which when the blown air blown out from the seat back outlet 5a is equal to or lower than a predetermined temperature, the damper 6 stops the blowout air from the seat back outlet 5a. is there. After starting the heating operation, the air conditioning unit 1 starts the air mix control when the room temperature becomes substantially stable. As a result, the blowout temperature that has increased with the temperature rise of the heater core gradually decreases. If the blow-out temperature of the air-conditioning unit 1 falls below a predetermined temperature (for example, 50 ° C.) in accordance with the air mix control, the knees of the rear passengers feel cold as shown in FIG. Note that FIG.
Is the result of measuring the relationship between the blow-out temperature of the air conditioning unit 1 and the thermal sensation of the knees of the rear passenger.

Therefore, in the present embodiment, when the air blown from the seat back outlet 5a falls below a predetermined temperature (described below), the upper duct 5 communicating with the seat back outlet 5a is opened as shown in FIG. The damper 6 is controlled so as to close, and the ventilation to the rear passengers' knees is stopped. In this case, the warm air supplied from the air conditioning unit 1 is all blown out from the foot outlet 4a through the lower duct 4 to the feet of the rear passenger. Thus, even when the blow-out temperature is reduced by the air mix control in the air conditioning unit 1, the feeling of cool air is not given to the knees of the rear occupant, and the heating feeling can be prevented from being impaired.

The above-mentioned “predetermined cold” is determined by the following methods:
Can be determined by Judgment is made based on the blowing temperature of the air conditioning unit 1. In this case, based on the measurement result shown in FIG. 9, the blowing temperature of 50 ° C. at which the occupant's thermal sensation becomes approximately 0 is used as a criterion, and the blowing temperature of 50 ° C. or less (hot sensation of 0 or less) is defined as a predetermined cold or less. I do. The blow-out temperature of the air conditioning unit 1 can be obtained by detecting means such as a sensor, or can be estimated from state information of the air conditioning unit 1 (cooling water temperature, post-evaporation temperature, air volume, air mix opening degree, etc.).

The determination is made based on the target blowing temperature (TAO) controlled by the air conditioning unit 1. In this case, for example, TAO50 ° C.
AO 50 ° C or lower is set to a predetermined cold or lower. Judgment is made based on the blowout temperature from the seat back blowout port 5a. The temperature of the air blown out from the seat back air outlet 5a is determined based on the air outlet temperature of the air conditioning unit 1 from the rear air duct 2 and the upper air duct 5.
And there is a correlation with the thermal sensation of the occupant as in the measurement result of FIG. Therefore, for example, the blowing temperature of 40 ° C. from the back surface outlet 5a is set as a criterion, and the blowing temperature of 40 ° C. or lower is set to a predetermined temperature or lower. The temperature of the air blown out from the seat back air outlet 5a may be obtained by detecting means such as a sensor or may be estimated from the TAO.

Judgment is made based on the temperature of engine cooling water, which is a heat source for heating. In this case, for example, the cooling water temperature of 60 ° C. is set as a criterion, and the cooling water temperature of 60 ° C. or less is set to a predetermined temperature or less. This cooling water temperature can be obtained by detecting means such as a sensor. Judgment is made based on the warmth of the occupant. In this case, the coldness (warmth feeling 0 or less) may be determined based on the occupant's own feeling. The opening / closing operation of the damper 6 is as follows.
An operating means for manually operating the damper 6 is provided, and when the occupant feels cold, the damper 6 is manually operated via the operating means or a signal is sent to the control device by a switch or the like, and the actuator (servo motor) is controlled by the control device. 9) can be operated electrically to operate the damper 6.

(Modification) In the first embodiment, the operation of the damper 6 is controlled on the basis of the water temperature (the temperature of the engine cooling water). May be controlled. Alternatively, control can be performed according to a time (timer) after the blower 3 is started. Although the damper opening on the upper duct 5 side is made as small as possible when Tw <Tw1, the upper duct 5 may be closed entirely.

In the system configuration shown in FIG. 1, the downstream side of the rear-seat ventilation duct 2 is branched into the lower duct 4 and the upper duct 5, but the rear-foot duct (the rear foot duct is heated to the foot of the rear passenger). In a vehicle equipped with a duct for supplying wind, an existing rear foot duct may be used as the rear air duct 2 and the lower duct 4. In addition, a fan for rear-seat ventilation may be provided in the rear-seat ventilation duct 2. As a result, the air volume to the rear passenger can be increased. Further, although the lower duct 4 has a larger passage cross-sectional area than the upper duct 5, both ducts may have the same passage cross-sectional area.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration for distributing air to a rear passenger (first embodiment).

FIG. 2 is a characteristic diagram showing a relationship between a water temperature and an air volume ratio.

FIG. 3 is a plan view of a rear side of a front seat back (second embodiment).

FIG. 4 is a side view of a seat back air outlet for explaining an operation of a guide plate.

FIG. 5 is a plan view of a back side of a front seat back (third embodiment).

FIG. 6 is a plan view of a back side of a front seat back (third embodiment).

FIG. 7 is a perspective view showing a configuration for distributing air to a rear passenger (fourth embodiment).

FIG. 8 is a schematic view of a duct (fourth embodiment).

FIG. 9 is a measurement result showing the relationship between the air outlet temperature of the air conditioning unit and the thermal sensation of the occupant (fifth embodiment).

FIG. 10 is an operation explanatory diagram showing a control state of a damper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air-conditioning unit 4a Foot outlet 5a Seat back outlet 6 Damper (air volume ratio adjusting means) 7 Front seat back 10 Guide plate (wind direction plate)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinji Aoki 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Corporation (72) Inventor Koichi Saka 1-1-1, Showa-cho, Kariya-shi, Aichi Co., Ltd. Inside Denso (72) Inventor Yuichi Kajino 1-1-1 Showa-cho, Kariya-shi, Aichi F-term in Denso Co., Ltd. 3L011 BT02 BV00 CP02

Claims (16)

[Claims] An air conditioning unit having an air outlet opening toward a foot of a rear seat occupant and an air outlet opening at the back of a front seat back to supply air to a vehicle interior is supplied through a duct. Air from the foot outlet to the feet of the rear occupant, and from the seat back outlet to the vicinity of the knees of the rear occupant, wherein the air is blown out from the foot outlet. An air conditioner for a vehicle, comprising: an air flow rate adjusting means for adjusting a ratio of an air flow rate to an air flow rate blown out of the seat back outlet. 2. A transient state from when the heating operation is started to when the blow-out temperature is substantially stabilized is determined. In the transient state, the amount of air blown out from the seat back outlet is set to a preset air flow rate. The vehicle air conditioner according to claim 1, wherein the air flow rate adjusting means is controlled to reduce the air flow rate. 3. At least at the seat back outlet, a wind direction plate for changing the direction of blown air is provided, and the direction of the wind direction plate is controlled to diffuse the blown air blown out from the seat back air outlet. The vehicle air conditioner according to claim 2, wherein the air conditioner is changed between a state and a concentrated state. 4. An air conditioner for a vehicle according to claim 3, wherein at an initial stage of said transient state, said air direction plate is controlled so as to diffuse the blown air blown out from said seat back air outlet. . 5. The vehicle air conditioner according to claim 3, wherein the direction of the wind direction plate provided at the seat back outlet is controlled in accordance with the inclination of the front seat back. . 6. The temperature of engine cooling water as a heat source for heating,
The vehicle air conditioner according to claim 2, wherein the determination of the transient state is performed using at least one signal of a vehicle interior temperature and a target outlet temperature. 7. The air outlet from the seat back air outlet is stopped by the air flow rate adjusting means when the air blown out from the seat back air outlet is lower than a predetermined temperature. 2. The vehicle air conditioner according to 1. 8. The air conditioner for a vehicle according to claim 7, wherein the predetermined coldness is determined based on a temperature of air blown from the air conditioning unit. 9. The air conditioner for a vehicle according to claim 7, wherein the predetermined coldness or less is a temperature of 50 ° C. or less from a temperature of air blown from the air conditioning unit. 10. The air conditioner for a vehicle according to claim 7, wherein the predetermined coldness is determined based on a target blowing temperature controlled by the air conditioning unit. 11. The air conditioner for a vehicle according to claim 7, wherein the predetermined temperature or lower is equal to or lower than a target outlet temperature controlled by the air conditioning unit and equal to or lower than 50 ° C. . 12. The air conditioner for a vehicle according to claim 7, wherein said predetermined coldness is determined by a temperature of air blown out from said seat back air outlet. 13. The air conditioner for a vehicle according to claim 7, wherein the predetermined temperature or less is a temperature of 40 ° C. or less from an outlet of the seat back. . 14. The vehicle air conditioner according to claim 7, wherein the predetermined coldness is determined based on a temperature of engine cooling water as a heating heat source. 15. The air conditioner for a vehicle according to claim 7, wherein the predetermined coldness or less is a temperature of engine cooling water as a heat source for heating of 60 ° C. or less. apparatus. 16. The vehicle air conditioner according to claim 7, wherein said predetermined coldness is determined by a feeling of warmth of an occupant.