JP2003054239A - Vehicular air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a seat air flow quantity of a vehicular seat air conditioner without having two kinds of main air conditioning control device of a vehicular main air conditioner and without adding or removing a function. SOLUTION: In a vehicular air conditioner equipped with a vehicular main air conditioner 1 and a vehicular seat air conditioner 2, a seat air conditioning control device 50 equipped in the vehicular seat air conditioner 2 generates a seat air blast control signal to control the seat air flow quantity of a seat blower 42 based on a main air blast control signal S1 to control the main air flow quantity of a main blower 15. Thereby, since a main air conditioning control device 21 equipped in the vehicular main air conditioner 1 is not required to have a function to control the air flow of the seat blower 42, the main air conditioning control device 21 can be used in common whether or not the vehicular seat air conditioner 2 is mounted in it.

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 including a main air conditioner for vehicle interior air conditioning and a seat air conditioner.

[0002]

2. Description of the Related Art Heating or cooling of an occupant sitting on a seat of a vehicle has been performed by air blown into the vehicle interior by a vehicle main air conditioner. However, since the body part of the occupant in contact with the seat surface is isolated from the air-conditioning environment in the vehicle interior, it cannot be said that air-conditioning in the vehicle interior alone is comfortable. Therefore, an air conditioner for a vehicle seat, which blows air from the seat surface and directly air-conditions the body of an occupant in contact with the seat surface, is required for improving the air conditioning feeling.

The first type of conventional vehicle seat air-conditioning system has a function of controlling the air volume in order to automatically control the air volume of the air blown from the seat surface, and a sensor for detecting environmental conditions necessary for the control. Is equipped with a seat only. However, since the control function and the sensor are provided exclusively for the seat, the cost becomes high.

Therefore, as a second type of vehicle seat air-conditioning system, the applicant of the present invention, Japanese Patent Application No. 2000-3390.
In application No. 37, the main air conditioning control device provided in the vehicle main air conditioning device also has an air volume control function for seat air conditioning, and the sensor is also shared by the main air conditioning control device and the vehicle seat air conditioning device. I suggest you do. That is, based on the signal of the sensor input to the main air conditioning control device, two air volume control signals for vehicle main air conditioning and seat air conditioning are independently generated in the main air conditioning control device, and The air volume control signal of the vehicle main air conditioner is transmitted to the main air blower of the vehicle main air conditioner, and the air flow control signal for seat air conditioning is transmitted to the seat air blower of the vehicle seat air conditioner, so that the vehicle main air conditioner and the vehicle seat air conditioner respectively It controls the amount of air blown from the air. As a result, the main air-conditioning control device and the sensor provided in the vehicle main air-conditioning system are shared, which is more advantageous in cost than the first type.

[0005]

By the way, in many cases, an air conditioner for a vehicle seat is an optional setting for selecting whether or not to install the system according to the taste of a vehicle purchaser. However, in the second type, the main air conditioning control device has both the air volume control functions for the vehicle main air conditioning and the seat air conditioning. Two types of devices must be prepared, a normal device and a device having a seat air conditioning air volume control function.

On the contrary, from the viewpoint of sharing the main air conditioning control device of the vehicle main air conditioning device, if a standard main air conditioning control device having a seat air conditioning control function is prepared, the vehicle seat air conditioning device is not mounted. In some cases, you have no choice but to throw away unnecessary functions.

In view of the above points, the present invention controls the seat air flow rate of a vehicle seat air conditioner without having to use two types of main air conditioner control devices for a vehicle main air conditioner and without adding or discarding functions. The purpose is to

[0008]

In order to achieve the above-mentioned object, in the invention described in claim 1, the main blower means (15) for blowing the air blown into the passenger compartment, and the main blower means (1).
5) A main air conditioning control device (21) for generating a main air flow control signal (S1) for controlling the main air flow, a seat air blower means (42) for blowing air blown to the seat surface, and this seat air blower means (42) And a seat air-conditioning control device (50) for generating a seat air-blowing control signal for controlling the seat air flow rate, and the seat air-conditioning control device (50) generates a seat air-blowing control signal based on the main air-blowing control signal (S1). It is characterized by

As a result, the seat air-blowing control signal is based on the main air-blowing control signal (S1) and the seat air-conditioning control device (50).
Since the main air conditioning control device (21) does not need to have a function of generating a seat blowing control signal, the main air conditioning control device (21) of the vehicle main air conditioning device (1) is the vehicle seat air conditioning device. A common one can be used regardless of whether or not (2) is attached. Therefore, the main air-conditioning control device (21) of the vehicle main air-conditioning device (1) does not have two types, and the situation of discarding functions does not occur.

According to the second aspect of the present invention, the seat blower means (42) operates the main blower means (15) if the air flow rate is changed in proportion to the main air flow rate of the main blower means (15). A proportional air conditioning function can be demonstrated.

In the invention according to claim 3, in the seat air-conditioning control device (50), the seat blower means (42) operates even when the main blower control signal (S1) turns off the main blower means (15). The seat blower control signal is generated as described above.

As a result, the main air blowing means (15) is turned off, and the seat air conditioning control device (50) is turned off by the seat air blowing control signal based on the main air blowing control signal (S1) even when the seat air blowing means (42) is also turned off. ) Generates a seat blowing control signal to activate the seat blowing means (42), so that the occupant can be immediately provided with the seat air conditioning function.

According to a fourth aspect of the present invention, in addition to the third aspect, a determination means (53) for determining whether or not the main air blowing means (15) is at least turned off at the time of air conditioning start is added. The same effect as that of the item 3 can be obtained.

According to a fifth aspect of the invention, the determining means (5
3) determines the start of air conditioning, and the main air blowing control signal (S1) gradually increases the main air amount of the main air blowing unit (15) after the main air blowing unit (15) is turned off. (50) continues to generate a seat ventilation control signal at the start of air conditioning, and the seat air conditioning control device (50) controls the seat ventilation control signal based on the main ventilation control signal (S1) and the seat ventilation during air conditioning start when the air volume increases. It is characterized in that, of the control signals, the one in which the seat air volume of the seat blowing means (42) is large is selected.

As a result, even when the air volume is increased, a seat air blowing control signal is generated when the air conditioning is started, which is not restricted by the main air blowing control signal (S1), and the seat air blowing control signal and the air conditioning starting time based on the main air blowing control signal (S1) are generated. Of the seat air blowing control signals, the one in which the seat air volume of the seat air blowing means (42) is large is selected, so that the seat air conditioning capacity can be further enhanced.

According to the sixth aspect of the present invention, the sensor (22) for detecting the physical quantity correlated with the vehicle interior temperature is provided on the input side of the main air conditioning controller (21), and the judging means (53) is provided. Is determined based on the signal (S2) of the sensor (22).

This makes it possible to use the sensor (22) provided in the vehicle main air conditioner (1) to make a determination when the air conditioning is started. Therefore, it is not necessary to add a component to the seat air-conditioning control device (50) for the determination, so that no extra cost is required.

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 shows the overall system configuration of a vehicle air conditioner including a vehicle main air conditioner 1 and a vehicle seat air conditioner 2 in the first embodiment. FIG.

First, based on FIG. 1, the vehicle main air conditioner 1
The configuration of will be described. The main air conditioning unit 11 provided in the vehicle main air conditioning system 1 is arranged inside the instrument panel in the front part of the vehicle compartment.

Main air duct 11a of main air conditioning unit 11
The outside air intake port 12 for sucking the air outside the vehicle
And an internal air intake port 13 for intake of air in the vehicle compartment, and an internal / external air door 14 is used to switch between internal and external air inhaled from the intake ports 12, 13.

A main blower 1 for blowing the air sucked in through the suction ports 12 and 13 is provided downstream of the suction ports 12 and 13.
5 are provided. The main blower 15 is a main blower motor 1 whose applied voltage is controlled by a main blower drive circuit 15a.
The rotation speed of the main blower fan 15c is controlled by 5b.

An evaporator 16 is provided downstream of the main blower 15.
And a heater core 17 are provided. The evaporator 16 is
Main blower duct 1 provided in a refrigeration cycle (not shown)
Cool the air in 1a. Further, the heater core 17 circulates engine cooling water (warm water) warmed by the heat generation of a vehicle running engine (not shown), and the main blower duct 11a.
Heat the air inside.

At the downstream portion of the heater core 17, a defroster outlet 18 that blows out conditioned air toward the windshield of the vehicle, a face outlet 19 that blows out conditioned air toward the upper half of the occupant's body, and at the feet of the occupant. A foot outlet 20 that blows out conditioned air is provided. These outlets 18 to 20 are opened and closed by a door (not shown).

The main air conditioning unit 1 constructed as described above
1 is controlled by the main air conditioning controller 21. The main air conditioning controller 21 is mainly composed of a microcomputer, and a control program is stored in a built-in ROM (not shown). Then, the main air conditioning control device 21
Controls the blowout temperature, the airflow rate, and the like of the air blown from the vehicle main air conditioner 1 into the vehicle compartment by executing the above control program.

Further, the main air conditioning control device 21 includes an inside air sensor 22 and an outside air sensor 2 for detecting a vehicle environmental condition.
3. Signals from the solar radiation sensor 24 that detects the amount of solar radiation, the water temperature sensor 25 that detects the engine water temperature, etc. are input. In addition, an operation signal is input to the main air conditioning control device 21 from a main air conditioning operation panel 30 installed near the instrument panel.

The main air-conditioning operation panel 30 has an intake mode selector switch 31 for manually switching the intake mode by the inside / outside air door 14 to outside air intake / inside air circulation, and manual switching for the air outlets 18 to 20 of the air blown into the vehicle interior. The blowout mode changeover switch 32, the blower changeover switch 33 for manually changing the main air volume of the main blower 15, the temperature setting switch 34 for manually setting the desired temperature in the vehicle compartment, and the like.

Here, the blower changeover switch 33 is a switch including an off position, an automatic operation mode position, and a changeover position for switching the air volume in two or more stages. Then, when the operation position of the blower changeover switch 33 is the automatic operation mode position or the changeover position for switching the air volume in two or more stages, the main air conditioning controller 21 is supplied with power (power on). That is, the blower changeover switch 33 also serves as the power on / off switch of the main air conditioning control device 21.

Next, the structure of the vehicle seat air conditioner 2 will be described. The seat air conditioning unit 40 and the seat air conditioning control device 50 provided in the vehicle seat air conditioner 2 are arranged inside a seat (specifically, a driver's seat).

Seat air duct 4 of seat air conditioning unit 40
The intake port 41 for sucking air in the vehicle interior is provided on the upstream side of 0a.
And a seat blower 42 that blows inhaled air. The seat blower 42 is a seat blower motor 42 whose frequency is controlled by a seat blower motor drive circuit 42a.
The rotation speed of the seat blower fan 42c is controlled by b.

An electric heater 43 for heating the air in the seat blower duct 40a is provided downstream of the seat blower 42.
And an air outlet 4 for blowing air from each of a seating portion (not shown) and a back support portion (not shown) of the seat through an air passage formed inside the seat air duct 40a.
It has 5 etc.

The seat air volume of the air blown from the air outlet 45 of the seat air conditioning unit 40 configured as described above is
It is controlled by the seat air conditioning controller 50. Details of the seat air conditioning control device 50 will be described later.

An operation signal is input to the seat air-conditioning control device 50 from a seat air-conditioning operation panel 65 that can be operated from below the seat bottom.

The seat air conditioning operation panel 65 is provided with an automatic operation switch 66 for switching between an automatic operation mode and a manual operation mode, a seat air volume setting switch 67 for manually setting the seat air volume of the seat blower 42, and the like.

The seat air volume setting switch 67 is a switch including an off position and a switching position for switching the air volume in two or more stages. Then, when the automatic operation switch 66 is in the automatic operation mode or the operating position of the seat air volume setting switch 67 is at the switching position for switching the air volume in two or more stages, the seat air conditioning control device 50 is supplied with power ( Power on). That is, the automatic operation switch 66 and the seat air volume setting switch 67 also serve as a power on / off switch of the seat air conditioning control device 50.

In addition to the operation signals of the automatic operation switch 66 and the seat air volume setting switch 67, the seat air conditioning control device 50 is provided with the following signals. That is,
The main blower control signal S1 of the main blower 15 and the inside air sensor analog signal S2. The main blower control signal S1 is a pulse signal that is generated by the main air conditioning controller 21 and that adjusts the voltage applied to the main blower 15 according to the pulse width. The inside air sensor analog signal S2 is an analog signal based on the signal from the inside air sensor 22 that detects the temperature inside the vehicle.

Next, the configuration of the seat air conditioning control device 50 will be described with reference to FIG. The analog switch circuit 56 is a movable piece 5.
6a. The movable piece 56a is linked to the fixed terminal 56b and the fixed terminal 5 in association with the automatic operation switch 66.
It comes in contact with either 6c. In addition,
The fixed terminal 56b is connected to the seat air volume setting switch 67, and the fixed terminal 56c is connected to the analog comparison circuit 55.

In FIG. 2, the analog comparison circuit 55
X is a signal output from the seat, and a seat ventilation control signal based on the main ventilation control signal S1 input to the analog comparison circuit 55 is a,
The seat blowing control signal at the start of heating is indicated by the symbol b.
Further, the analog comparison circuit 55 selects the larger one of the seat air blowing control signal a and the heating start seat air blowing control signal b based on the main air blowing control signal S1 described below, and outputs it to the analog switch circuit 56. It has become.

Next, the structure for generating the seat blowing control signal a based on the main blowing control signal S1 will be described. First,
A D / A converter 51 for converting the main air flow control signal S1 which is an input signal to the seat air conditioning control device 50 into an analog signal.
To provide. Then, a voltage adjusting circuit 52 is provided in order to take out a voltage signal having a constant ratio to this analog signal. The voltage adjusting circuit 52 is composed of a resistance voltage divider.
The voltage adjusting circuit 52 may be provided with a switch capable of manually adjusting the ratio.

Next, the structure for generating the seat blowing control signal b at the start of heating will be described. Seat air conditioning controller 50
A comparator circuit 53 is provided for taking in the inside air sensor analog signal S2 which is another input signal to the. The comparison voltage generator 53a connected to the comparator circuit 53 generates a comparison voltage that determines the heating start determination temperature T4 (for example, 15 ° C.).
On the output side of the comparator circuit 53, a voltage setting circuit 54 including a resistance voltage divider is provided.

The electric heater relay drive circuit 57, to which the output signal from the comparator circuit 53 is branched and transmitted, controls ON / OFF of the electric heater 43 via the electric heater drive relay 43a.

Further, the analog voltage signal output from the analog switch circuit 56 is input to the seat blower motor drive circuit 42a of the seat air conditioning unit 40, where the analog signal is converted into a pulse signal to form a seat composed of a three-phase AC motor. The frequency of the blower motor 42b is controlled. Thereby, the rotation speed of the seat blower fan 42c is controlled, and the seat air volume is controlled.

Next, the operation of the first embodiment having the above structure will be described. First, the outline of the main air volume control of the main blower 15 will be described. When the main air conditioning control device 21 is powered on, the main air volume is controlled by the main air conditioning control device 21.

FIG. 3 is a main air volume control pattern of the main blower 15 in the automatic operation mode controlled by the main air conditioning controller 21. The warm-up control shown on the right of Fig. 3 is
This is a control in which the main air volume of the main blower 15 is gradually increased from zero in response to an increase in the engine water temperature circulating in the heater core 17 of the main air conditioning unit 11 at the start of heating in winter. By this control, it is possible to eliminate the discomfort caused by the blowing of cold air. The control during warm-up is performed until the engine water temperature shown in the diagram on the right of FIG. 3 rises to the third predetermined temperature T3 (for example, 60 ° C.), and then the engine water temperature is set to the third temperature. Predetermined temperature T3
When it becomes higher, it is determined that it is in a steady state, and the main air volume control shifts to the steady state control shown on the left side of FIG.

Next, the warm-up control of the main air volume will be described more specifically. As shown in the right side of FIG. 3, the main air flow control pattern of the main blower 15 is such that the main blower 15 is turned off and the engine water temperature is the first predetermined temperature T1 until the engine water temperature rises to the first predetermined temperature T1 (for example, 30 ° C.). To the second predetermined temperature T2 (for example, 35 ° C.), the main air volume is maintained at the Lo level, and while the main air volume is gradually increased from the second predetermined temperature T2 to the third predetermined temperature T3,
This is air volume control in which the main air volume is set to the Hi level at the third predetermined temperature T3.

Next, steady-state control of the main air flow will be described. As shown on the left side of FIG. 3, the main air volume in the steady state control is
The characteristic is that it changes in a V-shape in accordance with the change in the target outlet temperature TAO. The target outlet temperature TAO on the horizontal axis of the graph is the target outlet temperature required to maintain the set temperature manually set by the temperature setting switch 34, regardless of changes in vehicle environmental conditions, It is calculated by the main air conditioning controller 21 based on the set temperature and the inside air sensor 22, the outside air sensor 23, the solar radiation sensor 24, and the like.

When the inside of the vehicle is at a high temperature, such as when the air conditioning starts in summer, the target outlet temperature TAO is in the low temperature range,
The target outlet temperature TAO is in a high temperature range when the temperature inside the vehicle is low, such as when heating is started in winter. When the target outlet temperature TAO is in such a region, the temperature inside the vehicle interior is far from the comfortable temperature, and therefore, a large air volume is blown so as to be comfortable as soon as possible. Then, when the temperature inside the vehicle approaches the set temperature, the main air flow rate is controlled so as to decrease.

The main air flow rate control pattern described above is created based on the main air flow control signal S1 which is a voltage signal for controlling the main air flow rate of the main blower 15.

Next, the outline of the seat air volume control of the seat blower 42 will be described. When the seat air conditioning control device 50 is powered on, the seat air volume is controlled by the seat air conditioning control device 50.

The operation of the seat air conditioning control device 50 will be described with reference to FIG. Note that FIG. 4 is a flowchart showing an outline of processing of seat air volume control of the seat blower 42 and on / off control of the electric heater 43 performed by the seat air conditioning control device 50, and in the operation description of FIG. 2, the flowchart of FIG. For those that are compatible with the processing step of, the step number of the processing step is added in parentheses.

As shown in FIG. 2, the automatic operation switch 6
When 6 is off, that is, in the manual operation mode, the movable piece 56a of the analog switch circuit 56 contacts the fixed terminal 56b connected to the seat air volume setting switch 67. In the seat air volume setting switch 67, an analog voltage signal corresponding to the manually set seat air volume is generated, and this signal is transmitted to the seat blower motor drive circuit 42a through the analog switch circuit 56, and the seat of the seat blower 42 is seated. Air volume control is performed (steps S4 and S5).

Next, when the automatic operation switch 66 is on, that is, in the automatic operation mode, the movable piece 56a of the analog switch circuit 56 contacts the fixed terminal 56c connected to the analog comparison circuit 55. Analog comparison circuit 55
Selects the larger one of the seat ventilation control signal a based on the main ventilation control signal S1 and the heating start seat ventilation control signal b (step S6), and outputs the selected signal to the analog switch circuit 56. The output analog voltage signal x controls the seat air volume of the seat blower 42 as in the manual operation mode.

Here, the seat blowing control signal a based on the main blowing control signal S1 becomes a voltage signal proportional to the main blowing control signal S1 by the voltage adjusting circuit 52. Further, the heating start seat blowing control signal b becomes a voltage signal proportional to the predetermined voltage signal output from the comparator circuit 53 by the voltage setting circuit 54. The comparator circuit 53 outputs the predetermined voltage signal when the inside air sensor analog signal is compared with the comparison voltage and it is determined that the vehicle interior temperature is equal to or lower than the heating start determination temperature T4 (at the heating start time). Further, the predetermined voltage signal output from the comparator circuit 53 is set to be the heating start seat air blowing control signal b which provides the Lo-level seat air volume by passing through the voltage setting circuit 54.

Next, the seat air volume control pattern of the seat blower 42 in the automatic operation mode by selecting the above two signals will be described more specifically. The seat air volume control has two seat air volume control patterns, that is, the heating start control and the steady time control, like the main air volume control. FIG. 5 shows the heating start control of the seat air volume.

The solid line in FIG. 5 indicates the seat blower 4 controlled by the seat blow control signal a based on the main blow control signal S1.
2 shows the main interlocking air volume. Since the main interlocking air volume is controlled by a voltage signal proportional to the main air flow control signal S1 that controls the main air volume, it has the same characteristics as the main air volume of the main blower 15 in the warm-up control shown in the right side of FIG. It becomes an air volume control pattern. The dashed-dotted line in FIG. 5 indicates L of the seat blower 42 controlled by the seat blowing control signal b at the start of heating.
The o-level seat-specific air volume is shown. Further, the horizontal axis of FIG. 5 shows the vehicle interior temperature and the engine water temperature together on the same axis, and the first predetermined temperature T1, the second predetermined temperature T2, and the third predetermined temperature T3 are described in FIG. The first predetermined temperature to the third predetermined temperature. Seat air conditioning start temperature Ts
Indicates the temperature inside the vehicle when the seat air-conditioning control device 50 is turned on at a low temperature.

Referring to FIG. 5, the change in the seat air volume in the heating start control will be described. When the engine water temperature is equal to or lower than the first predetermined temperature T1, the main blower 15 is off and the main blow control signal S
Since the seat ventilation control signal a based on 1 is not generated, the analog comparison circuit 55 selects the heating start seat ventilation control signal b. As a result, the seat airflow becomes the Lo-level seat-specific airflow (step S8). Also, the first predetermined temperature T1
Therefore, the question of the second predetermined temperature T2 is the Lo-level seat air volume regardless of which voltage signal is selected. When the engine water temperature is higher than the second predetermined temperature T2, the analog comparison circuit 55 selects the seat airflow control signal a based on the main airflow control signal S1 that is larger than the seat airflow control signal b at the time of heating start, and the seat airflow rate. Becomes the main interlocking air volume in which the air volume gradually increases (step S7). Then, when the vehicle interior temperature exceeds the heating start determination temperature T4, the seat air volume control shifts from the heating start time control to the steady time control.

Further, the vehicle interior temperature is the heating start judgment temperature T.
When it exceeds 4, the comparator circuit 53 does not determine the heating start time and does not output the predetermined voltage signal, so that the heating start seat blowing control signal b is not generated.

In the first embodiment, the minimum main interlocking air volume determined by the seat air blowing control signal a based on the main air blowing control signal S1 is set as the Lo level, and this is set as the seat specific air volume. However, the seat-specific air volume is not necessarily limited to the Lo level.

Next, the steady-state control of the seat air flow will be described. In the steady state control in which the vehicle compartment temperature is higher than the heating start determination temperature T4, the heating start seat air blowing control signal b is not generated, so the seat air volume control is performed by the seat air blowing control signal a based on the main air blowing control signal S1. . That is, in the steady state control, the seat air volume has an air volume control pattern having the same characteristics as the main air volume in the steady state control of the main blower 15 shown on the left side of FIG.

Regarding the on / off control of the electric heater 43, when the comparator circuit 53 determines that the heating is started (step S1), the predetermined voltage signal output from the comparator circuit 53 is the electric heater relay drive circuit. 57, and the electric heater 43 is turned on via the electric heater drive relay 43a (step S2). In the steady state, no signal is generated from the comparator circuit 53 and the electric heater 4
3 is turned off (step S3).

Here, considering the seat air volume control of the seat blower 42, when the heating is started, the electric heater 43 having immediate heat is turned on to send the warm air. Then, in a steady state, the electric heater 43 is turned off, but even if the electric heater 43 is turned off, the sucked air having a proper temperature is blown.

With the above configuration and operation, the seat air-blowing control signal for controlling the seat air volume of the seat air blower 42 can be generated by the seat air conditioning control device 50 and is provided in the vehicle main air conditioning device 1. Since the main air-conditioning controller 21 does not need to have the air volume control function of the seat blower 42,
The main air conditioning control device 21 can be shared regardless of whether or not the vehicle seat air conditioning device 2 is installed.

Further, in the steady state control in which the air volume control of the seat blower 42 is performed by the seat air blow control signal a based on the main air blow control signal S1, the seat air volume of the seat air blower 42 is also proportional to the main air volume of the main air blower 15. Because of the change, the occupant can obtain a seat air conditioning function corresponding to the operation of the main blower 15.

Further, even when the main blower 15 is turned off and the seat air flow control signal a based on the main air blow control signal S1 causes the seat air flow rate to be zero, the seat air flow rate becomes the predetermined air flow rate by the heating start seat air blow control signal b. Therefore, the seat air conditioning function can be immediately provided to the occupant.

More specifically, at the start of heating, when the seat blower 42 is turned off by the seat blow control signal a based on the main blow control signal S1, the seat air conditioning control device 50 turns on the electric heater 43 to turn on the heating. Since the seat blower control signal b is generated at the start and the warm air of a predetermined air volume is sent from the seat blower 42, the occupant can immediately obtain the seat air conditioning function.

Further, when the air volume is gradually increased at the start of heating, the main air volume of the main air blower 15 is gradually increased.
Among the seat air blowing control signal a based on 1 and the seat heating air blowing control signal b at the time of heating start, the one in which the seat air volume of the seat air blower 42 is larger is selected, so that the seat air conditioning capacity can be further enhanced.

(Second Embodiment) In the first embodiment described above, the predetermined air volume according to the seat blowing control signal b at the start of heating is L.
Although only the o level is provided, in the second embodiment, it is also possible to generate the heating start seat air blow control signal b for setting the predetermined air volume of the seat air blower 42 to the Hi level, and the selection of these two is the first embodiment. It is different from the form.

The configuration of the second embodiment will be described with reference to FIG. In the first embodiment, only the first comparator circuit 53 is provided for the determination at the start of heating, but in the second embodiment, the inside air sensor analog signal S2 branched from the input to the first comparator circuit 53. A second comparator circuit 71 for taking in is added.
The second comparison voltage generator 71a connected to the second comparator circuit 71 has a low temperature heating start determination temperature T0 (for example, 5
A second comparison voltage that determines (.degree. C.) is generated.

A switch circuit 72 is provided on the output side of the first comparator circuit 53 and the second comparator circuit 71.
The switch circuit 72 selects the larger one of the predetermined voltage signals output from the two comparator circuits.

Next, the operation of the second embodiment will be described. The second comparator circuit 71 compares the inside air sensor analog signal S2 with the second comparison voltage, and particularly the low temperature region heating start determination temperature T in which the vehicle compartment temperature is sufficiently lower than the heating start determination temperature T4.
When it is 0 or less, it is determined that the low temperature region heating is started, and a predetermined voltage signal is output to the switch circuit 72. Here, the predetermined voltage signal output from the second comparator circuit 71 is the predetermined voltage output from the first comparator circuit 53 so as to obtain the heating start seat ventilation control signal b that provides the seat air volume at the Hi level. It is set higher than the signal. Therefore, at the start of low-temperature region heating, the switch circuit 72 causes the second comparator circuit 71 to
Select a predetermined voltage signal from.

Therefore, the seat air volume of the seat blower 42 at the time of starting the low temperature heating becomes the seat air volume of the Hi level. This is shown in the seat specific air volume 2 (two-dot chain line) in FIG. 7. And
When the vehicle interior temperature exceeds the low temperature heating start determination temperature T0, the second comparator circuit 71 does not output the predetermined voltage signal, and the switch circuit 72 selects the predetermined voltage signal from the first comparator circuit 53. .

Further, when the vehicle interior temperature is higher than the low temperature heating start determination temperature T0, the seat air volume changes in the same manner as in the first embodiment. The main interlocking airflow (solid line) and the seat-specific airflow 1 (one-dot chain line) shown in FIG. 7 are the same as those in FIG.

By the way, not only the above-mentioned Lo-level and Hi-level seat-specific airflows, but a new comparator circuit and a new comparison voltage generator are added to generate seat-specific airflows of three or more stages. Is also good. As a result, even when the heating is started, the seat airflow can be supplied to the occupant according to the temperature in the passenger compartment, so that the occupant can obtain the seat air conditioning function with a fine texture.

(Other Embodiments) (1) In the above-described first and second embodiments, the inside air sensor 22 is used as a sensor for detecting a physical quantity that correlates with the vehicle interior temperature.
Although the determination at the time of heating start is performed using, the water temperature sensor 25 that detects the engine water temperature may be used instead. (2) In the above first and second embodiments, the electric heater 43 for heating the air is used as the heat exchanger of the seat air conditioning unit 40, but instead of the electric heater 43,
A device capable of heating and cooling, such as a Peltier electric heating element, may be used.

When a device capable of both heating and cooling is used, it is preferable to determine not only at the start of heating but also at the start of cooling. This is because the temperature of the evaporator 16 of the main air conditioning unit 11 is lowered to a predetermined temperature so that warm air does not blow out from the main air conditioning unit 11 even when the cooling in the summer starts and the passengers are not uncomfortable. This is because there is a control that gradually increases from zero. This is called control during cooldown.

In the cool-down control, the main blower 15 is turned off, and with the seat blower control signal a based on the main blower control signal S1, even when cooling is started with the seat blower 42 turned off, as in the second embodiment. A new comparator circuit and a new comparison voltage generator are added to control the seat air volume so that the seat blower 42 does not turn off, and at the same time when cooling starts, the air is cooled by a device using a Peltier electric heating element, It is good to send cold air. As a result, even at the start of cooling,
The occupant can immediately obtain the seat air conditioning function. (3) In the first and second embodiments described above, the seat air-conditioning control device 50 is configured by combining circuit elements, but the configuration is not limited to this, and a control program is installed and a microcomputer is mainly configured. You may.

[Brief description of drawings]

FIG. 1 is an overall system configuration diagram of a first embodiment of the present invention.

FIG. 2 is a circuit diagram of seat airflow control according to the first embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a main air volume control pattern according to the first embodiment of the present invention.

FIG. 4 is a flowchart of seat air volume control according to the first embodiment of this invention.

FIG. 5 is a characteristic diagram showing a seat air flow rate control pattern at the start of heating according to the first embodiment of the present invention.

FIG. 6 is a circuit diagram of seat air volume control according to a second embodiment of the present invention.

FIG. 7 is a characteristic diagram showing a seat air volume control pattern at the start of heating according to the second embodiment of the present invention.

[Explanation of symbols]

1 ... Vehicle main air conditioner, 2 ... Vehicle seat air conditioner, 15
... Main blower, 21 ... Main air conditioning control device, 22 ... Inside air sensor, 42 ... Seat blower, 50 ... Seat air conditioning control device,
53 ... Comparator circuit, S1 ... Main ventilation control signal, S2 ...
Inside air sensor analog signal.

Claims (6)

[Claims] 1. A vehicle air conditioner comprising: a vehicle main air conditioner (1) for air conditioning air blown into a vehicle compartment; and a vehicle seat air conditioner (2) for air conditioning air blown to a seat surface. Main blowing means (1) for blowing the air blown into the passenger compartment
5), a main air-conditioning control device (21) for generating a main air-blowing control signal (S1) for controlling the main air volume of the main air-blowing means (15), and a seat air-blowing means (42) for blowing air blown to the seat surface. ) And a seat air-conditioning control device (50) that generates a seat air-blowing control signal that controls the seat air volume of the seat air-blowing means (42), and the seat air-conditioning control device (50) includes the main air-blowing control signal (50). An air conditioner for a vehicle, which generates the seat blowing control signal based on S1). 2. The seat air conditioning control device (50) changes the seat air volume of the seat air blowing means (42) in proportion to the main air volume of the main air blowing means (15). The vehicle air conditioner according to Item 1. 3. The seat air-conditioning control device (50) operates the seat blower means (42) even when the main blower control signal (S1) turns off the main blower means (15). The vehicle air conditioner according to claim 1 or 2, wherein the seat blowing control signal is generated. 4. The seat air-conditioning control device (50) has a judging means (53) for judging whether or not the main air-blowing means (15) is at least at the time of air-conditioning startup immediately after the start of air-conditioning in the passenger compartment. When the determination means (53) determines that the air conditioning is started and the main air blowing control signal (S1) turns off the main air blowing means (15), the seat air conditioning control device (50) causes the seat air conditioning control device (50) to The vehicle air conditioner according to claim 3, wherein a seat air blowing control signal is generated when the air conditioning is started so that the seat air volume of the air blowing unit (42) becomes a predetermined air volume. 5. The main air flow rate of the main air blower means (15) after the main air flow control signal (S1) is turned off by the determination means (53) when the air conditioning is started. Even when the air volume is gradually increased, the seat air conditioning control device (50) continuously generates the air conditioning start seat air blowing control signal, and the seat air conditioning control device (50), when the air volume increases, Of the seat ventilation control signal based on the ventilation control signal (S1) and the air conditioning start seat ventilation control signal,
The vehicle air conditioner according to claim 4, wherein one of the seat blowing means (42) having a larger air volume is selected. 6. A sensor (22) for detecting a physical quantity having a correlation with a vehicle interior temperature is provided on the input side of the main air conditioning control device (21), and the determination of the determination means (53) is performed by the sensor. The vehicle air conditioner according to claim 4 or 5, wherein the operation is performed based on the signal (S2) of (22).