JP2000264038A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle capable of restricting deterioration of air-conditioned feel of rear seat occupants seated on a rear seat on which a seat air conditioning unit for air-conditioning the seat to be additionally provided to a front air conditioning unit is not installed. SOLUTION: In this air conditioner for a vehicle provided with a seat air conditioning unit 3 for introducing air-conditioning blow in a front air conditioning unit for air-conditioning the inside of a cabin of the vehicle and blowing the air-conditioning blow from the surface of a front seat 10, a blower control voltage to be applied to a blower motor of a front air conditioning centrifugal blower is corrected to the side where blow of the front air conditioning centrifugal blower is increased when a seat air conditioning centrifugal blower 7 of the seat air conditioning unit 3 is operated, so rise of temperature in the cabin in an air conditioning zone on the rear seat side where a seat air conditioning unit is not installed, that is temperature around a head part of a rear seat occupant, is restricted.

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 comprising a front air conditioning unit for air conditioning the interior of a vehicle, and a seat air conditioning unit for air conditioning the seat by guiding the conditioned air of the front air conditioning unit to the seat. It concerns the device.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10A, a blower and a heat exchanger provided in an air-conditioning duct of a front air-conditioning unit (HVAC) 101 installed on the front side of a vehicle cabin are used. By operating the air conditioner to adjust the vehicle interior temperature to an appropriate temperature by air-conditioning air blown into the vehicle interior from the air conditioning duct, comfortable air conditioning is provided for the seat occupant 102 seated in the front seat and the seat occupant seated in the rear seat of the vehicle. There is a vehicle air conditioner that gives a feeling.

As shown in FIG. 10 (b), a seat air conditioning unit 103 is connected to the air downstream of the front air conditioning unit 101, and the conditioned air in the air conditioning duct of the front air conditioning unit 101 is guided to the seat. The vehicle air-conditioning system (see Japanese Utility Model Application Laid-Open No. 59-164) is configured to provide a comfortable air-conditioning feeling to the
552). Note that, even in a vehicle equipped with a seat air conditioning unit, it is common that the seat air conditioning unit 103 is installed in front seats such as a driver seat and a passenger seat, and the seat air conditioning unit 103 is not installed in a rear seat. .

[0004] At the time of cooling down, the blower level (air flow level) when air is blown to the surface of the seat by the seat air conditioning blower in the seat air conditioning duct of the seat air conditioning unit 103 is, for example, 30 m ³ / h to 60 m ^3. / H
It is. The heat flow at that time is shown in FIG. In addition,
FIG. 10A is a diagram showing a heat flow of a vehicle air conditioner having no seat air conditioning unit mounted thereon, and FIG. 10B is a diagram showing a heat flow of a vehicle air conditioner having a seat air conditioning unit mounted thereon. FIG.

[0005]

However, in a conventional vehicle air conditioner not equipped with a seat air conditioning unit, the capacity of the indoor air conditioning unit is used to reduce the temperature of the vehicle interior to a set temperature at the time of cooling down. Will be
On the other hand, in a vehicle air conditioner equipped with a seat air-conditioning unit, the seat air flow rate (−30 m ³ /
h~-60m ³ / h) content will be used for the ability for the seat air-conditioning.

As a result, in a vehicle air conditioner equipped with a seat air conditioning unit, as shown in a graph of FIG. 11, compared with a vehicle air conditioner not equipped with a seat air conditioning unit (current state). In addition, there is a problem that the temperature in the passenger compartment (temperature of the head of the occupant) of the air conditioning zone on the side of the seat (for example, the rear seat) where the seat air conditioning unit is not installed is increased by the amount of air blown by the seat. Here, FIG. 11 shows the effect on the seat without the seat air conditioning (after 5 minutes of cool down), and is a graph showing the relationship between the seat air flow and the temperature change of the occupant's head with respect to the current state. (Conditions are outside air temperature of 40 ° C, solar radiation of 1 kW / m ² , and set temperature of 25 ° C).

[0007]

SUMMARY OF THE INVENTION The present invention relates to a vehicle air conditioner provided with a seat air conditioner for air conditioning a vehicle seat by guiding air conditioning air in an air conditioning unit for air conditioning a vehicle cabin. It is an object of the present invention to suppress a decrease in the air-conditioning sensation of an occupant seated in a seat in which a seat air-conditioning unit is not installed by suppressing a variation in a vehicle interior temperature in a seat-side air-conditioning zone that is not provided. I do.

[0008]

According to the first aspect of the present invention, when the seat air-conditioning means is moving, the air volume of the blower installed in the air-conditioning duct of the air-conditioning unit or the voltage applied to the blower is reduced. By raising, the influence on the seat-side air-conditioning zone where the seat air-conditioning unit is not installed can be reduced. As a result, it is possible to suppress a change in the cabin temperature in the seat-side air-conditioning zone where the seat air-conditioning unit is not installed, and to suppress a decrease in the air-conditioning sensation of the occupant sitting on the seat where the seat air-conditioning unit is not installed. be able to.

According to the second aspect of the present invention, it is possible to reduce the influence on the rear seat side air conditioning zone where the seat air conditioning means is not installed. Can be suppressed. As a result, it is possible to suppress a decrease in the air-conditioning sensation of the rear seat occupant sitting on the rear seat where the seat air-conditioning unit is not installed.

According to the third aspect of the present invention, the seat air conditioning is corrected by correcting the air volume of the blower or the voltage applied to the blower on the basis of the air volume of the blower for seat air conditioning or the voltage applied to the blower for seat air conditioning. Since it is possible to reduce the influence on the rear seat side air conditioning zone where the means is not installed, it is possible to suppress the fluctuation of the vehicle interior temperature in the rear seat side air conditioning zone.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Structure of Embodiment] FIGS. 1 to 3 show an embodiment of the present invention. FIG. 1 is a diagram showing the entire structure of a front air conditioning unit, and FIG. FIG. 3 is a diagram showing the entire configuration of the unit, and FIG. 3 is a diagram showing a control system of the vehicle air conditioner.

The vehicle air conditioner of this embodiment is a front air conditioning unit for air conditioning the entire passenger compartment (both the front seat side air conditioning zone and the rear seat side air conditioning zone) of a vehicle such as an automobile equipped with the engine 1. 2, a vehicle seat air conditioner (hereinafter referred to as a seat air conditioner unit) 3, which is connected to the air downstream side of the front air conditioner unit 2 and air-conditions only front occupants in the front seat side air conditioner zone; Air conditioning control device (hereinafter referred to as an air conditioning ECU) that controls each actuator of the unit 2 and the seat air conditioning unit 3.
4).

The front air-conditioning unit 2 includes a front air-conditioning duct 11 that forms an air passage therein, a centrifugal fan 12 that generates conditioned air in the front air-conditioning duct 11, and a blower motor that rotationally drives the centrifugal fan 12. 13, a cooling heat exchanger 14 for cooling the air passing through the front air conditioning duct 11, and a heating heat exchanger 15 for heating the air passing through the front air conditioning duct 11. I have.

At this time, at the upstream of the front air conditioning duct 11, at least an inside air circulation mode in which the inside air (inside air) is sucked from the inside air suction port 16 and outside air in which the outside air (outside air) is sucked through the outside air suction port 17. An inside / outside air switching door 18 for switching between modes is provided. The inside / outside air switching door 18 is driven by an actuator 19 such as a servomotor.

On the other hand, a defroster (DEF) opening (outlet) 20,
Air outlet switching doors 23 and 24 for switching the air outlet mode by opening and closing a face (FACE) opening (air outlet) 21 and a foot (FOOT) opening 22 are provided. These air outlet switching doors 23 and 24 are driven by actuators 25 and 26 such as servo motors.

Centrifugal fan 12 and blower motor 13
Is a front air-conditioning centrifugal blower 5 together with a scroll casing formed integrally with the front air-conditioning duct 11.
It constitutes. The blower motor 13 has a blower amount (rotational speed of the centrifugal fan 12) controlled based on a blower application voltage (hereinafter, referred to as a blower control voltage) applied via a blower drive circuit 27.

The cooling heat exchanger 14 is an evaporator (refrigerant evaporator), which is a component of the refrigeration cycle, and is disposed in the front air-conditioning duct 11 so as to cover the entire air passage. The cooling heat exchanger 14 has a refrigerant flowing therein to cool the air passing therethrough.

Here, the refrigeration cycle includes a compressor 30 for compressing the sucked refrigerant, a condenser (refrigerant condenser) 31 for condensing and liquefying the compressed refrigerant, and a gas-liquid separation of the condensed and liquefied refrigerant so that only the liquid refrigerant is formed. Downstream receiver (liquid receiver, gas-liquid separator) 32, expansion valve (expansion valve, decompression means) 33 for decompressing and expanding the liquid refrigerant, cooling heat exchanger 14 for evaporating and evaporating the decompressed and expanded refrigerant , And a refrigerant pipe or the like connecting these in a ring shape.

The compressor 30 is a refrigerant compressor which is driven by the belt of the engine 1 to compress and discharge the refrigerant drawn from the heat exchanger 14 for cooling. The shaft of the compressor 30 has V
An electromagnetic clutch 35 is connected as clutch means for intermittently transmitting the rotational power from the engine 1 to the compressor 30 via the belt 34. This electromagnetic clutch 35
Is controlled by the clutch drive circuit 36. In addition, 3
Reference numeral 9 denotes a cooling fan for sending cooling air to the condenser 31.

The heating heat exchanger 15 is a heater core constituting one component of a cooling water circuit through which the cooling water of the engine 1 circulates, and is disposed in the front air conditioning duct 11 so as to partially block the air passage. I have. This heating heat exchanger 15
Cooling water for cooling the engine 1 flows inside, and the cooling water is used as a heat source for heating, passes through the cooling heat exchanger 14, and reheats the cooled cold air.

On the upstream side of the heating heat exchanger 15, the amount of air passing through the heating heat exchanger 15 and the heat
The air mix (A / A) adjusts the ratio of the amount of air bypassing the air conditioning 5 to the temperature of the air-conditioned air blown into the vehicle cabin.
M) A door 37 is provided. This A / M door 37
Are driven by an actuator 38 such as a servomotor.

The seat air-conditioning unit 3 corresponds to the seat air-conditioning means of the present invention, and is integrally attached to a lower portion of a front seat (hereinafter referred to as a front seat) 10 such as a driver's seat or a passenger seat. The seat air conditioning duct 6 includes a seat air conditioning duct 6 and a seat air conditioning centrifugal blower 7 that generates an airflow toward the surface of the front seat 10 in the seat air conditioning duct 6.

Here, between the seat air conditioning unit 3 for air conditioning the front passenger in the front seat side air conditioning zone and the front air conditioning unit 2 for air conditioning the entire vehicle cabin, a cold air passage 41 and a hot air passage 41 are internally provided. A front air-conditioning air duct 43 in which an air passage 42 is formed, and a seat air-conditioning air duct 44 connected to the front air-conditioning air duct 43 downstream of the air are connected.

The cold air passage 41 is a first communication passage communicating with a communication port 8 provided in the downstream of the cooling heat exchanger 14 in the air. The inside of the cooling air passage 41 is mainly cooled by the cooling heat exchanger 14. Flows. The hot air passage 42 is a second communication passage communicating with the FOOT opening 22 provided on the downstream side of the air-conditioning duct 11. The warm air passage 42 is mainly heated by the heating heat exchanger 15. The wind flows.

A partition plate 45 for dividing the cold air passage 41 and the hot air passage 42 is provided in the front air-conditioning ventilation duct 43. At the downstream side of the partition plate 45, the cold air passage 41 and the hot air passage 41 are connected such that the air passage in the air conditioning air duct 44 on the downstream side of the air is connected to either the cold air passage 41 or the hot air passage 42. A passage switching door 46 for selectively opening and closing the passage 42 is provided. The passage switching door 46 is driven by an actuator 47 such as a servomotor.

A front foot (FOOT) outlet 48 for blowing out warm air from the warm air passage 42 to the feet of the front occupant sitting on the front seat 10 is connected to the front of the front air conditioning duct 43. Have been. And, at the air downstream end of the air duct for front air conditioning 43,
The air upstream end of the air conditioning duct 44 is connected.

The air conditioning duct 44 is, for example, a front air conditioning duct 43 of the front air conditioning unit 2.
Utilizes the existing rear foot duct, which mainly supplies warm air to the feet of the rear passengers sitting in the rear seats (rear seats) from the front to the rear in the passenger compartment along the vehicle floor. Two are arranged toward.

The seat air-conditioning duct 6 has an inverted L-shaped connecting duct 50 connected to the air downstream end of the seat air-conditioning blowing duct 44, and a movable duct connected to the air downstream end (upper end in the drawing) of the connecting duct 50. Duct 51, this movable duct 5
1 unit case 5 having the downstream end of air as suction port 52
And a rear foot (FOOT) duct 54 extending from the air downstream end of the unit case 53 toward the foot of the rear occupant on the rear seat side.

Of these, the movable duct 51 is adapted to cope with the movement of the unit case 53 because the unit case 53 fixed to the lower portion of the front seat 10 moves by adjusting the position of the front seat 10 in the vehicle longitudinal direction. It has a bellows shape. In the unit case 53, an electric heater (auxiliary heat source for heating) 55 such as a PTC heater is disposed so as to entirely cover the air passage.
Note that the electric heater 55 may not be provided. At the air downstream end of the rear FOOT duct 54, a rear foot (FOOT) outlet 56 for blowing out conditioned air to the feet of the rear passenger on the rear seat side is provided.

The centrifugal blower 7 for seat air conditioning includes a unit case 53 forming a scroll case, and a centrifugal fan 5 rotatably housed in the unit case 53.
And a blower motor 58 for rotating the centrifugal fan 57 and the like, and forcibly blows the conditioned air sucked from the suction port 52 formed on the lower surface of the unit case 53. The blower motor 58 has a blower amount (rotational speed of the centrifugal fan 57) controlled based on a blower application voltage (hereinafter, referred to as a blower control voltage) applied via a blower drive circuit 59.

Here, the front seats 10 on the driver's seat side and the passenger's seat side of the present embodiment are constituted by a seat back 61 and a seat cushion 62, and are respectively covered by breathable seat surface members 63 and 64. I have. Also,
Inside the seat back 61 and the seat cushion 62,
Air distribution ducts 66 and 67 are provided, which are connected to a communication passage 65 that opens on the upper surface of the unit case 53.

A plurality of outlet passages (seat air-conditioning outlets) 68, 69 extending to the surfaces of the seat back 61 and the seat cushion 62 extend from the air distribution ducts 66, 67 so as to branch off. As a result, the air conditioning wind
Each of the outlet passages 68, 69 passes through the air distribution ducts 66, 67.
And is blown from each of the outlet passages 68 and 69 to the front occupant sitting on the front seat 10 through the seat surface members 63 and 64.

A passage switching door for adjusting the amount of air going to the communication passage 65 and the amount of air going to the rear FOOT outlet 56 is provided at the air upstream end of the communication passage 65 opened on the upper surface of the unit case 53. 71 are provided. This passage switching door 71 is driven by an actuator 72 such as a servomotor.

As shown in FIG. 3, a communication signal output from a seat air-conditioning control device (seat air-conditioning ECU) 9 and various switches from a control panel 73 provided on the front surface of the vehicle interior are provided to the air-conditioning ECU 4 as shown in FIG. Switch signal,
And sensor signals from various sensors.

Here, the various switches include at least a temperature setting switch (temperature setting means) for setting the vehicle interior temperature to a desired temperature, and a switch for switching the amount of air blown by the centrifugal fan 12 of the front air conditioning unit 2. There are a front air-conditioning air volume changeover switch (air volume changeover means) and an air outlet changeover switch for switching the air outlet mode.

On the other hand, as shown in FIG. 3, various sensors include an internal air temperature sensor (indoor air temperature detecting means) 74 for detecting the air temperature in the vehicle interior (indoor air temperature, internal air temperature), and an air temperature outside the vehicle interior. An outside air temperature sensor (outside air temperature detecting means) 75 for detecting (outside air temperature), a solar radiation sensor (insolation detecting means) 76 for detecting the amount of solar radiation radiated into the vehicle interior, a cooling heat exchanger 1
4, a post-evaporation temperature sensor 77 for detecting the air temperature (post-evaporation temperature), and a cooling water temperature for detecting the temperature (cooling water temperature) of the cooling water of the engine 1 supplied to the heating heat exchanger 15. There is a sensor 78 and the like.

The seat air-conditioning ECU 9 is provided with switch signals and various sensors from various switches such as a seat air-conditioning switch, a seat air-conditioning temperature setting switch, and a seat air-conditioning air volume change-over switch (none are shown) provided on the control panel 73. The controller 47 automatically controls the actuator 47 of the passage switching door 46, the blower driving circuit 59 for driving the blower motor 58 of the centrifugal fan 57, the actuator 72 of the passage switching door 71, and the like, based on the sensor signal from the controller.

The air-conditioning air-volume selector switch switches the blower control voltage to be applied to the blower motor 58 to a minimum value (Lo) or a maximum value (Hi) while the seat air-conditioning switch is ON. The air volume of the fan 57 is changed to the minimum air volume and the maximum air volume. The seat air-conditioning air flow rate switch is configured such that when set to “AUTO”, the blower control voltage is changed linearly (continuously) from “Lo” to “Hi”. In the present embodiment, the seat air-conditioning switch is turned off.
When F, the power supply to the blower motor 58 stops (OFF).
I do.

A CPU (not shown), a ROM (not shown), and a ROM (R) are provided inside the air conditioner ECU 4 and the seat air conditioner ECU 9.
A microcomputer comprising an AM or the like is provided, and sensor signals from the sensors 74 to 78 are transmitted to the air conditioner ECU 4.
After being A / D converted by an input circuit (not shown), the input is input to the microcomputer.

[Operation of Embodiment] Next, a control method of the front air-conditioning unit 2 of this embodiment will be briefly described with reference to FIGS. Here, FIG.
4 is a flowchart showing a basic control process according to the fourth embodiment.

First, when the ignition switch is turned on (ON) and DC power is supplied to the air conditioner ECU 4, the routine of FIG. 4 is started to perform each initialization and initial setting (step S1). Next, switch signals are read from various switches such as a temperature setting switch (step S2).

Next, communication (transmission and reception) with the seat air-conditioning ECU 9 which reads the ON signal or the OFF signal of the seat air-conditioning switch and the air volume signal of the seat air-conditioning air volume switch is performed (step S3). Next, sensor signals obtained by A / D conversion of output signals output from the inside air temperature sensor 74, the outside air temperature sensor 75, the solar radiation sensor 76, the post-evaporation temperature sensor 77, the cooling water temperature sensor 78, and the like are read (step S4).

Next, the following equation 1 previously stored in the ROM:
The target blowing temperature (TAO) of the air blown into the vehicle compartment is calculated (determined) based on the formula (step S5).

(Equation 1)

Here, Tset is the set temperature set by the temperature setting switch, TR is the inside air temperature detected by the inside air temperature sensor 74, TAM is the outside air temperature detected by the outside air temperature sensor 75, and TS is the sunshine sensor 76. Is the amount of solar radiation detected.
Kset, KR, KAM and KS are gains,
C is a correction constant.

Next, the subroutine of FIG. 8 is called, and the blower control voltage (blower level, blower motor 13
Is determined (step S).
6). Next, the suction port mode is calculated (determined) based on the control characteristic diagram and the target outlet temperature (TAO) stored in the ROM in advance (step S7).

Here, in determining the suction port mode,
From the low target air temperature (TAO) to the high temperature, the inlet mode is determined to be the inside air circulation mode and the outside air introduction mode. In addition, the outlet mode may be determined in the same manner, or may be fixed to the outlet mode set by the outlet switch provided on the control panel 73.

Next, the following equation 2 previously stored in the ROM:
The target air mix of the A / M door 37 (A
/ M) Calculate (determine) the door opening (SW) (step S8).

(Equation 2)

Here, TAO is the target outlet temperature obtained in step S5 of FIG. 4, TE is the post-evaporation temperature detected by the post-evaporation temperature sensor 77, and TW is the cooling water temperature detected by the cooling water temperature sensor 78.

Next, the operating state of the compressor 30 is determined. That is, the control characteristic diagram previously stored in the ROM and the post-evaporation temperature (T
Based on E), the start and automatic stop of the compressor 30 are determined (step S9).

Specifically, when the post-evaporation temperature (TE) is, for example, 4 ° C. or higher, the electromagnetic clutch 35 is energized (ON) so that the compressor 30 starts (ON). Also,
When the post-evaporation temperature (TE) is, for example, 3 ° C. or less, the energization of the electromagnetic clutch 35 is stopped (OFF) so that the compressor 30 is automatically stopped (OFF).

Next, a blower drive circuit 27 for driving the blower motor 13 of the centrifugal fan 12 and an actuator 19 of the inside / outside air switching door 18 so as to obtain the respective control states calculated or determined in steps S6 to S9. ,
Actuators 25, 2 of outlet switching doors 23, 24
6. Clutch drive circuit 36 of electromagnetic clutch 35 and A
/ M outputs a control signal to the actuator 38 of the door 37.

Further, the actuator 47 of the passage switching door 46 and the centrifugal fan 5
7, a control signal is output so that the control state of the blower drive circuit 59 for driving the blower motor 58 and the actuator 72 of the passage switching door 71 becomes one of the front seat cooling mode, the front seat heating mode, and the rear seat air conditioning mode (step S10). ). Then, in step S11, the control cycle time t (for example, 0.
After waiting for 5 seconds to 2.5 seconds), the process returns to the control process of step S2.

Next, the seat air conditioning unit 3 of this embodiment
Will be described with reference to FIGS. Here, FIG. 5 is a flowchart showing a basic control process by the seat air-conditioning ECU 9.

First, when the ignition switch is turned on (ON) and DC power is supplied to the seat air-conditioning ECU 9, the routine shown in FIG. 5 is started to perform each initialization and initial setting (step S12). Next, switch signals are read from various switches such as a seat air-conditioning temperature setting switch (step S13). Next, communication (transmission and reception) with the air conditioner ECU 4 that has read the target outlet temperature (TAO) is performed (step S14).

Next, the following equation 3 previously stored in the ROM:
The target sheet blowing temperature (Tas) blown to the surface of the front seat 10 is calculated (determined) based on the formula (Step S15).

(Equation 3)

Here, dl is a coefficient, Tset · sin is a sheet inlet temperature target value set by a seat air-conditioning temperature setting switch, TAO is a target outlet temperature (sheet inlet temperature) obtained in step S5 of FIG. 4, and C is This is a correction constant.
When a seat inlet temperature sensor for detecting the inlet temperature of the seat air-conditioning duct 6 is provided, the detected value of the seat inlet temperature sensor may be substituted for the TAO.

Next, a blower control voltage (applied to the blower motor 58 of the centrifugal fan 57) based on the target sheet blowing temperature (Tas) obtained in step S15 and control characteristic diagrams (see FIGS. 6 and 7). Blower applied voltage)
Is determined (step S16).

Here, FIG. 6 (a) shows (Tset.
FIG. 6B is a control characteristic diagram showing a blower control voltage with respect to (Sin-TAO), and FIG.
FIG. 4 is a control characteristic diagram showing a target sheet blowing temperature (Tas) with respect to AO). FIG. 7A shows (Tse) in winter.
FIG. 7B is a control characteristic diagram showing the blower control voltage with respect to (t · sin−TAO), and FIG.
FIG. 10 is a control characteristic diagram showing a target sheet blowing temperature (Tas) with respect to (−TAO).

Immediately after the start of the start of the engine 1 in winter,
If the cooling water temperature is still lower than a predetermined value (for example, 40 ° C. to 60 ° C.) and there is a possibility that cool air may blow out from the surface of the front sheet 10, in order to prevent the cool air blowout,
The warm-up control as shown in FIG. 7C is performed. FIG. 7C is a control characteristic diagram showing the blower control voltage with respect to the cooling water temperature at the time of warm-up control (heating transition period).

Next, based on the target seat outlet temperature (Tas), the front seat cooling mode, the front seat heating mode or the rear seat air conditioning mode, the opening degree of the passage switching door 46 and the door opening of the passage switching door 71 are determined. The degree is determined (step S17).

Next, each step S16, step S17
In order to obtain each control state calculated or determined in,
Blower drive circuit 59 for driving actuator 47 of passage switching door 46 and blower motor 58 of centrifugal fan 57
A control signal is output to the actuator 72 of the passage switching door 71 (step S18). Then, in step S19, the control cycle time t (for example, 0.
After waiting for 5 seconds to 2.5 seconds), the process returns to the control processing of step S13.

Next, the processing for determining the blower control voltage according to the present embodiment will be described with reference to FIGS. Here, FIG. 8 is a flowchart showing the process of determining the blower control voltage by the air conditioner ECU 4, and FIG. 9 is a control showing the corrected blower level of the blower motor 13 of the centrifugal fan 12 with respect to the blower level of the blower motor 58 of the centrifugal fan 57. It is a characteristic diagram.

First, when the subroutine of FIG. 8 is started,
It is determined whether or not the seat air conditioning centrifugal blower 7 of the seat air conditioning unit 3 is moving (ON) (step S2).
1). If the result of this determination is NO, that is, if the blower motor 58 of the centrifugal fan 57 is stopped (OFF), it is determined from the control characteristic diagram (see X in FIG. 9) stored in the ROM in advance. A blower control voltage (blower level: V) corresponding to the outlet mode (MODE), the target outlet temperature (TAO), and the internal air temperature (TR) is determined (step S22). Thereafter, the process exits the subroutine of FIG.

If the decision result in the step S21 is YES
In other words, when the blower motor 58 of the centrifugal fan 57 is moving (ON), the blowout mode (MODE) is obtained from the control characteristic diagram stored in the ROM in advance (see Y in FIG. 9). Then, a blower control voltage (corrected blower level: V) corresponding to the target outlet temperature (TAO) and the internal air temperature (TR) is determined (step S23). Thereafter, the process exits the subroutine of FIG.

The blower motor 1 of the centrifugal fan 12
3 is corrected so that the blower control voltage (blower level) of the blower motor 58 of the centrifugal fan 57 increases from Lo to Hi. Here, the two-dot chain line in the control characteristic diagram of FIG. 9 indicates the outlet mode (MODE), in which the internal air temperature (TR) is changed from a high temperature to a low temperature, or the target air temperature (TAO) is changed from a low temperature to a high temperature. The next order indicates that the outlet mode is set to the FACE mode, the B / L mode, and the FOOT mode.

The solid line in the control characteristic diagram of FIG. 9 indicates the correction blower level (V) of the front air conditioning centrifugal blower 5 when the seat air conditioning centrifugal blower 7 is ON, for example, when the blower control voltage is Hi. Show. 9 indicates the blower level (V) of the front air-conditioning centrifugal blower 5 when the seat air-conditioning centrifugal blower 7 is OFF, and the broken line in the control characteristic diagram of FIG. Is the target outlet temperature (TA
O). However, the case where the outside air temperature (TAM) is 40 ° C. and the amount of solar radiation (TS) is 1 kW / m ² is shown.

[Effects of the Embodiment] As described above, the vehicle air conditioner of the present embodiment has a seat air conditioning unit downstream of the front air conditioning duct 11 of the front air conditioning unit 2 for air conditioning the entire vehicle cabin. 3 is connected to the seat air conditioning duct 6, and conditioned air (cold air or hot air) is introduced from the front air conditioning duct 11 into the seat air conditioning duct 6 and blown out from the surface of the front seat 10. The room temperature control that brings the temperature (inside air temperature) close to the set temperature and the control that blows conditioned air directly to the front seat occupant provide a comfortable air conditioning feeling to the front seat occupant in the front seat side air conditioning zone.

In such a vehicle air conditioner, a seat air conditioning centrifugal blower 7 installed in a seat air conditioning duct 6 of a seat air conditioning unit 3 for air conditioning a front seat occupant in a front seat side air conditioning zone, that is, a centrifugal blower. When the blower motor 58 of the type fan 57 is moving (ON), as shown in the control characteristic diagram of FIG. 9, the front air conditioning centrifugal blower 5 installed in the front air conditioning duct 11 of the front air conditioning unit 2, That is, the blower control voltage applied to the blower motor 13 of the centrifugal fan 12 is changed to the normal blower control voltage (FIG. 9).
A predetermined amount than the one-dot chain line) in the control characteristic view of (e.g. front seat air blowing ^{amount: -30m 3 / h~-60m 3} /
h) so that the blower air volume is increased.

As a result, the influence on the rear seat (rear seat) side air-conditioning zone where the seat air-conditioning unit 3 is not installed (the adverse effect such as a decrease in air-conditioning wind reaching the rear seat occupant) can be suppressed. As a result, it is possible to suppress a rise in the vehicle interior temperature (temperature of the head of the rear seat occupant) in the rear seat air conditioning zone in summer, and to suppress a decrease in the vehicle interior temperature in the rear seat air conditioning zone in winter. Therefore, it is possible to suppress a decrease in the air conditioning feeling of the rear passenger.

[Other Embodiments] In this embodiment, the control method of the air mixing type temperature control system is used as the method of controlling the temperature of the air blown into the vehicle interior. As a method, a control method of a reheat type temperature control method may be used.

In this embodiment, an example in which a seat air-conditioning unit 3 capable of blowing air-conditioned air from the surface of a front seat (front seat 10) such as a driver's seat front seat and a passenger seat front seat is mounted on a vehicle. However, the vehicle may be equipped with a seat air-conditioning unit capable of blowing air-conditioned air from the surface of a rear seat (rear seat) such as a driver-side rear seat and a passenger-side rear seat. Further, even in the case of a passenger car having a capacity of 6 or more (vehicles having three or more rows of seats) or a bus vehicle, it is possible to have a seat with a seat air conditioning unit and a seat without a seat air conditioning unit. The present invention can be applied if the invention is applied.

In this embodiment, the front air conditioning unit 2 installed on the front side of the passenger compartment is used as the air conditioning unit, and the conditioned air in the front air conditioning unit 2 is sent to the seat air conditioning unit 3. A rear air conditioning unit installed on the rear side of the vehicle interior may be used as a unit, and the conditioned air that has passed through the heat exchanger in the rear air conditioning unit may be sent to the seat air conditioning unit.

Further, the present invention provides a left-right independent temperature control capable of independently controlling the left-right temperature of the driver seat side (right seat side) air conditioning zone and the passenger seat side (left seat side) air conditioning zone. Vehicle temperature control system that can control the front and rear temperature of the front seat side air conditioning zone and the rear seat side air conditioning zone independently of each other. It may be applied to an air conditioner for home use.

In the present embodiment, correction is made such that the larger the blower control voltage applied to the blower motor 58 of the centrifugal blower 7 for seat air conditioning, the greater the blower control voltage applied to the blower motor 13 of the centrifugal blower 5 for front air conditioning. However, the blower control voltage applied to the blower motor 58 includes a target outlet temperature (sheet inlet temperature: TAO), a target sheet outlet temperature (Tas), and a sheet inlet temperature target value (Ts).
et.sin), the blower control voltage applied to the blower motor 13 of the front air conditioning centrifugal blower 5 may be corrected based on any of those values.

Further, the blower control voltage applied to the blower motor 13 of the front air-conditioning centrifugal blower 5 is corrected according to the operation states "Hi", ("Me") and "Lo" of the seat air-conditioning air volume changeover switch. You may do it. In addition, the blower control voltage and the blower amount applied to the blower motor 13 of the front air conditioner centrifugal blower 5 are corrected based on the blown air amount of the seat air-conditioning centrifugal blower 7 or the blown air amount of the conditioned air blown from the surface of the seat. You may do it.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an entire configuration of a front air conditioning unit (embodiment).

FIG. 2 is a schematic diagram illustrating an entire configuration of a seat air conditioning unit (Embodiment).

FIG. 3 is a block diagram showing a control system of the vehicle air conditioner (embodiment).

FIG. 4 is a flowchart showing basic control processing by an air conditioner ECU (embodiment).

FIG. 5 is a flowchart showing basic control processing by a seat air-conditioning ECU (embodiment).

FIG. 6A is a control characteristic diagram showing a blower control voltage in summer, and FIG. 6B is a control characteristic diagram showing a target sheet blowing temperature in summer (embodiment).

7A is a control characteristic diagram showing a blower control voltage in winter, FIG. 7B is a control characteristic diagram showing a target seat blowout temperature in winter, and FIG. 7C is a blower control in warm-up control. FIG. 4 is a control characteristic diagram showing a voltage (embodiment).

FIG. 8 is a flowchart showing a process of determining a blower control voltage by an air conditioner ECU (embodiment).

FIG. 9 is a control characteristic diagram showing a correction blower level of a front air conditioning centrifugal blower with respect to a blower level of a seat air conditioning centrifugal blower (embodiment).

10A is a diagram illustrating a heat flow of a vehicle air conditioner having no seat air conditioning unit mounted thereon, and FIG. 10B is a diagram illustrating a heat flow of a vehicle air conditioner having a seat air conditioning unit mounted thereon. FIG.

FIG. 11 is a graph showing a relationship between a seat air flow and a temperature change amount of an occupant's head with respect to a current state.

[Explanation of symbols]

 2 Front air conditioning unit (indoor air conditioning unit) 3 Seat air conditioning unit (seat air conditioning means) 4 Air conditioner ECU (blower control means) 5 Front air conditioning centrifugal blower 6 Seat air conditioning duct 7 Seat air conditioning centrifugal blower 9 Seat air conditioning ECU 10 Front seat 11 Front air conditioning duct 14 Heat exchanger for cooling 15 Heat exchanger for heating 57 Centrifugal fan 58 Blower motor

Continued on the front page (72) Inventor Koichi Saka 1-1-1, Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (Reference) 3L011 AU00 BV01

Claims (3)

[Claims] (A) an air-conditioning duct for sending air-conditioned air toward the passenger compartment of a vehicle, and an indoor air-conditioning unit having a blower for generating an air flow in the air-conditioning duct; A sheet air-conditioning unit that is connected to the downstream side of the air and guides the conditioned air in the air-conditioning duct to the sheet, thereby air-conditioning the sheet; (c) when the sheet air-conditioning unit is in operation, An air conditioner for a vehicle, comprising: blower control means for increasing a voltage applied to the blower. 2. The vehicle air conditioner according to claim 1, wherein the indoor air conditioning unit has a heat exchanger that cools or heats the air passing through the air conditioning duct, and the seat air conditioning unit includes a vehicle. A seat for connecting the air-conditioning air cooled or heated by the heat exchanger to the surface of the front seat, the air-conditioning duct being connected to a downstream side of the heat exchanger of the air conditioning duct and installed in the front seat of the air conditioning duct An air conditioner for a vehicle, comprising: a duct for air conditioning; and a blower for seat air conditioning that generates an air flow in the duct for seat air conditioning. 3. The air conditioner for a vehicle according to claim 2, wherein the blower control means is configured to control the air flow of the blower or the air flow of the blower based on a flow rate of the blower for seat air conditioning or a voltage applied to the blower for seat air conditioning. An air conditioner for a vehicle, wherein a voltage applied to a blower is corrected.