JPH07315031A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To surely blow air to occupants regardless of a ratio of inside air to the amount of sucked air in a constitution where inside air is sucked in for air conditioning, and is blown in a cabin. CONSTITUTION:In an air conditioning unit 1, a duct 2 is partitioned into an upper and an lower layer so as to be formed into a first blowing passage 3 and a second blowing passage 4. Both outside air and inside air sucked in the first blowing passage 3 located at the upper section are air-conditioned by an evaporator 11 and a heater core 13, and is blown off to the upper half of each occupant's body. And inside air sucked in the second blowing passage 4 is warmed up by the heater core 13, and is blown off to the feet of each occupant. In this case, the more a ratio of inside air to the amount of sucked air is increased, the more the carry-over propertie of blowing to the occupants are degraded. Since a control means 27, in this case, increases the amount of blowing as a ratio of inside air to the amount of sucked air is increased, air can thereby be surely blown off to the occupants.

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 which blows inhaled outside air and inside air into a vehicle compartment in a predetermined air conditioning state.

[0002]

2. Description of the Related Art Conventionally, an air conditioner for a vehicle is generally used in an inside air mode in which the inside air in a vehicle compartment is circulated and cooled in the summer, and in an outside air mode in the winter or all seasons. Is.

By the way, the reason why the air once cooled or warmed by the air conditioner is exhausted to the outside of the passenger compartment by ventilation is
Since the loss is large and it is against the energy saving, it is considered that the inside air is constantly conditioned and circulated, and as an example, a half inside air mode in which the outside air and the inside air are completely mixed and blown is proposed.

On the other hand, as an air conditioner, an upper and lower two-layer unit with further reduced ventilation loss has been developed, and the applicant previously applied for Japanese Patent Application No. 5-41507. This one forms an upper and lower two-layer passage by partitioning the inside of the duct through which the air blown into the passenger compartment passes vertically, and air-conditions the outside air drawn into the upper passage to prevent fog and maintain a refreshing feeling for passengers. The air is blown to the upper half of the occupant's upper body, and the inside air sucked into the lower passages is heated to heat the occupant's feet so that the air is blown to the occupant's feet. According to such an upper and lower two-layer unit, as compared with the above-mentioned semi-inside air type unit, it is possible to independently air-condition and blow the outside air or the inside air corresponding to the air blowing portion of the occupant. It is possible to suppress the amount of air conditioning with respect to the blown air, and thus improve the energy efficiency.

[0005]

However, even in the above-mentioned semi-inside air mode and the independent air conditioning system for the outside air and the inside air by the upper and lower two-layer units, the inside air is always sucked into the air conditioner. An internal air flow is generated in which the blown air returns to the air conditioner. Therefore, compared to the case of only the outside air mode, the reachability of the blown air to the occupant is deteriorated, and the occupant may feel uncomfortable regardless of the air conditioning control.

Here, FIG. 11 shows the flow of air blown into the vehicle compartment in the outside air mode, and FIG. 12 shows the flow of air blown into the vehicle compartment when the upper and lower two-layer units are used. As can be seen from FIGS. 11 and 12, when the upper and lower two-layer units are used, compared to the outside air mode,
The reachability of cold air (outside air) to the upper body of the occupant in the front seat is deteriorated, and the reachability of warm air (inside air) to the feet of the occupant is deteriorated. Further, FIG. 13 shows the flow of air blown in the passenger compartment in the configuration in which the duct for blowing air to the feet of the passengers in the rear seats is provided. The reachability of the blown air to the feet has deteriorated.

The present invention has been made in view of the above circumstances, and an object thereof is to deteriorate the reachability of air blown to an occupant in a structure in which sucked outside air and inside air are blown into a vehicle compartment in a predetermined air conditioning state. An object of the present invention is to provide a vehicle air conditioner capable of preventing such a situation.

[0008]

The vehicle air conditioner of the present invention is provided with a blower for blowing the sucked outside air outside the vehicle compartment and the inside air in the vehicle compartment into the vehicle compartment in a predetermined air conditioning state. An air conditioning control means for controlling the state is provided, and an air flow rate correction means for correcting the air flow rate into the vehicle interior by the air flow control means is increased as the proportion of the inside air to the air intake rate to the air flow control means is increased. Is.

In the above structure, the air flow rate correction means may be adapted to perform the correction when the air flow means is set to blow air to the upper half of the occupant.

Further, the blown air amount correction means may perform the correction when the blower means is set to blow air to the feet of an occupant.

Further, the blower means is provided so as to blow the sucked inside air to the feet of the passenger in the front seat and blow the air to the feet of the passenger in the rear seat through the guide passage. It may be so arranged that the larger the proportion of the inside air to the suctioned amount into the means, the larger the amount of air blown through the guide passage by the air blower.

Further, the blower means may be provided with a first blower passage for blowing the outside air into the vehicle compartment and a second blower passage for blowing the inside air into the vehicle compartment independently.

[0013]

In the vehicle air conditioner according to the first aspect of the invention, the blower control means blows the outside air outside the vehicle compartment and the inside air inside the vehicle compartment into the vehicle compartment in a predetermined air conditioning state by controlling the blower means. At this time, as the ratio of the inside air to the amount of air sucked into the air blower increases, the air blown to the occupant is sucked into the air blower, which deteriorates the reachability to the occupant.

Therefore, the air flow rate correction means corrects the air flow rate into the vehicle compartment by the air flow means so that the air flow rate into the vehicle interior increases as the proportion of the inside air to the air flow rate into the air flow means increases. It is possible to reliably blow air to the occupant regardless of the increase in the inside air ratio.

In the vehicle air conditioner according to the second aspect of the present invention, when the air blower is set to blow air to the upper body of the occupant, the inner air ratio to the amount of air sucked into the air blower increases with respect to the upper body of the occupant. The reachability of blast will be deteriorated.

Therefore, since the air blowing amount correcting means performs the correction when the air blowing means is set to blow air to the upper body of the occupant, the air blowing amount correcting means ensures the upper body of the occupant regardless of the ratio of the inside air to the amount of air sucked into the air blowing means. Can be blown to.

In the vehicle air conditioner according to the third aspect of the present invention, when the air blower is set to blow air to the feet of the occupant, the greater the proportion of the inside air to the amount of air sucked into the air blower, the greater the air pressure to the feet of the occupant. The reachability of blast will be deteriorated.

Therefore, the air blowing amount correcting means performs the correction when the air blowing means is set so as to blow the air to the feet of the occupant. Therefore, regardless of the ratio of the inside air to the amount of air sucked into the air blowing means, It can surely blow air.

In the vehicle air conditioner according to the fourth aspect, the blower blows the inhaled air to the feet of the passenger in the front seat and to the feet of the passenger in the rear seat through the guide passage.
At this time, pressure loss occurs when the inside air passes through the guide passage, and the reachability of the air blow to the passengers in the rear seat deteriorates.

Therefore, the air flow rate correcting means corrects so that the air flow rate through the guide passage increases as the proportion of the inside air to the air intake rate into the air blower means increases, so that the rear seats are irrespective of the pressure loss due to the guide passage. The air can be reliably blown to the feet of the passengers.

In the vehicle air conditioner according to the present invention, the air blower air-conditions and blows the outside air into the vehicle compartment when passing the outside air through the first air passage, and the inside air passes through the second air passage. When it is made to air-condition, it blows. Thereby, since the outside air and the inside air can be air-conditioned independently, the energy efficiency for air-conditioning the blown air can be improved as compared with the configuration in which the outside air and the inside air are mixed and air-conditioned to be blown.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 schematically shows a vehicle air conditioner of upper and lower two-layer units. In FIG. 1, the inside of the duct 2 of the air conditioning unit 1 serving as a blowing unit is divided into upper and lower layers so that the first blowing passage 3 located at the upper portion.
And the second air passages 4 located at the bottom are respectively formed. An outside air introduction port 5 and an inside air introduction port 6 are formed at the entrance of the first air passage 3, and an inside / outside air switching damper 7 is provided corresponding to each of the introduction ports 5 and 6. A blower 8 is provided on the downstream side of the outside air introduction port 5 and the inside air introduction port 6, and the outside air (the air outside the vehicle compartment) or the inside air (the air inside the vehicle compartment) is supplied from the outside air introduction port 5 according to the driving of the blower 8. Are sucked into the first air passage 3. In this case, the inside / outside air switching damper 7 is provided so that the opening degree is adjusted, and the ratio between the outside air quantity sucked into the first air passage 3 and the inside air quantity is adjusted according to the opening degree. . On the other hand, an internal air introduction port 9 is provided at the suction port of the second air passage 4 so that the internal air is sucked into the second air passage 4 in response to the driving of the blower 10.

An evaporator 11 as a cooling means is provided on the downstream side of each of the blowers 8 and 10 so as to close the first blower passage 3 and the second blower passage 4 as a whole. The evaporator 11 constitutes a refrigeration cycle device, and is cooled to a predetermined temperature by supplying a refrigerant in response to the driving of the compressor 12. A portion of the first air passage 3 on the downstream side of the evaporator 11 is formed so as to project to the second air passage 4 side, and thereby the second air passage 4 is formed.
The air that has passed through the evaporator 11 in the air passage 4 can flow into the first air passage 3.

Further, the first side is provided on the downstream side of the evaporator 11.
A heater core 13 as a heating means is arranged so as to close a part of the air passage 3 and the entire second air passage 4. Further, in the first air passage 2, the heater core 1
An air mix damper 14 is provided at a position where a bus pass of 3 is provided, and the air volume passing through the heater core 13 and the heater core 13 in the air passing through the first air passage 3 are bypassed according to the opening degree of the air mix damper 14. The amount of air flow is adjusted.

Here, as the heater core 13, E
In the case of a V (electric vehicle) vehicle, a heat pump cycle capacitor is used, and in the case of a gasoline vehicle, a flow control type heater core is used.

A defroster outlet 15 and a face outlet 16 are formed at the terminal end of the first air passage 3, and a defroster damper 17 and a face damper 18 are provided corresponding to each outlet 15, 16. ing. Also,
A foot outlet 19 is formed at the terminal end of the second air passage 4, and a foot damper 20 is provided corresponding to the foot outlet 19. A front foot outlet 21 is formed on the downstream side of the foot outlet 19. Further, a rear foot duct 22 as a guide passage is connected to the foot outlet 19, and a rear foot outlet 23 is formed at the terminal end of the rear foot duct 22. In this case, an air volume ratio adjustment damper 24 is provided on the downstream side of the front foot air outlet 21, and among the air blown from the foot air outlet 19 according to the opening degree of the air volume ratio adjustment damper 24, the front foot air outlet is adjusted. The amount of air blown from the outlet 21 and the amount of air blown from the rear foot outlet 23 are adjusted.

A differential mode damper 25 is provided on the downstream side of the heater core 13 so as to partition the first air passage 3 and the second air passage 4. This differential mode damper 25
Is opened when the diff mode is selected, and the second air passage 4 is opened to the first air passage 3 and thus the defroster air outlet 15
It is designed to communicate with.

The temperature setting switch 26 controls the set temperature as a control device 2 as an air-conditioning control means and an air flow rate correction means.
Output to 7. The outside air temperature sensor 28 detects the temperature outside the vehicle cabin (outside air temperature) and outputs it to the control device 27. The inside air temperature sensor 29 detects the temperature inside the vehicle (inside air temperature) and outputs it to the control device 27. The solar radiation sensor 30 detects the amount of solar radiation that has entered the vehicle interior and outputs it to the control device 27. Then, the control device 27 controls the set temperature and the blowing mode (differential mode,
(Face mode, foot mode, bi-level mode) and by driving the compressor 12 according to environmental conditions, the evaporator 11 is adjusted to a predetermined temperature, and the air mix damper 14, the defroster damper 17, the face damper 18, the foot damper 20, the air volume ratio. The opening degree of the adjustment damper 24 is adjusted.

Next, the operation of the above configuration will be described. FIG. 2 shows an automatic air conditioning operation among the operations of the control device 27,
The description of other operations is omitted. In FIG. 2, the control device 27 controls the outside air temperature detected by the outside air temperature sensor 28,
The inside air temperature detected by the inside air temperature sensor 29, the amount of solar radiation detected by the solar radiation sensor 30, and the set temperature set by the temperature setting switch 26 are read (step S1).

Subsequently, the control device 27 calculates the target outlet temperature TAO into the passenger compartment based on the data obtained in step S1 (step S2), and based on the target outlet temperature TAO, the outlet mode, the inside / outside air level, The blower voltage and the opening degree of the air mix damper are determined (step S3).

Here, FIG. 3 shows the outlet mode for the target outlet temperature TAO, FIG. 4 shows the opening of the inside / outside air switching damper 7 for the target outlet temperature TAO, and FIG. 5 shows the blower voltage for the target outlet temperature TAO. Shows. Further, the opening degree of the air mix damper 14 with respect to the target outlet temperature TAO is determined using a predetermined arithmetic expression.

When the determined outlet mode is the differential mode (step S4), the controller 27 determines that
Air conditioning control is executed based on the set air conditioning conditions (step S8).

When the determined outlet mode is the face mode, the controller 27 finally determines the blower level according to the inside / outside air ratio. That is, as shown in FIG. 5, the larger the proportion of inside air, the larger the total amount of air blown into the passenger compartment. Then, the control device 27
Air conditioning control is executed based on the set control contents (step S8).

FIG. 7 shows the air conditioning unit 1 in the face mode.
Shows the control state of. The face mode is a mode in which temperature-controlled and humidity-controlled conditioned air is blown to the upper body of the occupant. In this case, the control device 27 drives the compressor 12 as necessary to cool the evaporator 11 to a predetermined temperature. The outside air sucked into the first air passage 3 is cooled by the evaporator 11, and then a part of the outside air is heated by the heater core 13 according to the opening degree of the air mix damper 14 so that the air is blown into the face. The air is blown from the exit 16 to the upper body of the passenger in the passenger compartment. Further, all of the inside air sucked into the second air passage 4 is cooled by the evaporator 11 and then heated by the heater core 13 to be dehumidified, and then is blown from the face outlet 16 to the feet of the passenger in the vehicle compartment. It

By the way, in the above-mentioned face mode, since the inside air is always sucked into the second blowing passage 4 and the inside air is also sucked into the first blowing passage 3 in accordance with the target outlet temperature TAO, the suction is conducted to the duct 2. When the amount of the inside air to be increased becomes large, even if the conditioned air (mainly the outside air) is blown from the face outlet 16 into the passenger compartment, the conditioned air is sucked into the duct 2 before it reaches the upper body of the occupant sufficiently. If it does, the air conditioning performance may deteriorate.

However, in this embodiment, step S
6, when the face mode is executed, the duct 2
Since the amount of air blown from the face outlet 16 is increased as the proportion of the inside air sucked into the air is increased, FIG.
As shown in, even if the proportion of the inside air increases, the conditioned air can be reliably blown to the upper half of the occupant's upper body, and the air conditioning performance can be sufficiently exerted.

On the other hand, in FIG. 2, when the outlet mode is the foot mode or the bi-level mode, the control device 27 determines the opening of the blower voltage and the air volume ratio adjusting damper 24 according to the inside / outside air ratio. . That is, as shown in FIG. 8, the larger the inside air ratio, the larger the total blown air amount, and the larger the blown air ratio to the rear seat side.

FIG. 9 shows the control state of the air conditioning unit 1 in the bilevel mode. This bi-level mode is
In this mode, cool air is blown to the upper body of the occupant and warm air is blown to the feet of the occupant. In this case, the control device 27
Basically stops the compressor 12. Then, the outside air sucked into the first blower passage 3 is air-conditioned by adjusting the ratio of passing through the heater core 13 according to the opening degree of the air mix damper 14 and then blown into the vehicle interior from the face outlet 16. To be done. Further, most of the inside air sucked into the second air passage 4 is blown into the vehicle compartment from the foot outlet 19.

FIG. 10 shows the control state of the air conditioning unit 1 in the foot mode. This foot mode is
In this mode, warm air is blown to the passengers' feet and dry air is blown to the window glass. In this case, the control device 27
Basically stops the compressor 12. The outside air sucked into the first air passage 3 is the heater core 1
While being heated by 3, the air is blown from the defroster outlet 15 to the window glass, most of the inside air sucked into the second air passage 4 is heated by the heater core 13 and blown into the vehicle compartment from the foot outlet 19. .

By the way, in the above-mentioned bi-level mode or foot mode, the inside air is always sucked into the second blowing passage 4 and the inside air is also sucked into the first blowing passage 3 in accordance with the target outlet temperature TAO. When the amount of inside air sucked into the duct 1 becomes large, even if the inside air warmed into the passenger compartment is blown from the front foot outlet 21 and the rear foot outlet 23, the inside air does not reach the passenger's feet sufficiently. There is a risk that the heating performance will be deteriorated by being sucked into the duct 2.

However, in this embodiment, step S
7, when the bi-level mode or the foot mode is executed, the larger the proportion of the inside air taken into the duct 2, the larger the amount of air blown from the front foot outlet 21 and the rear foot outlet 23. As shown in FIG. 8, it is possible to reliably deliver the warm air to the feet of the occupant to sufficiently exert the heating performance despite the increase of the inside air ratio.

When the inside air is blown to the feet of the occupants in the rear seats through the rear foot duct 22, the amount of the inside air blown to the rear seats decreases due to the pressure loss due to the rear foot duct 22. The deterioration of the heating performance for passengers becomes remarkable. In this case, in the present embodiment, as the proportion of the inside air sucked into the duct 2 is increased, the proportion of air blown to the rear seats is increased. Can be blown to maintain heating performance.

According to the above-mentioned structure, in the structure in which the outside air outside the passenger compartment and the inside air sucked into the duct 2 are air-conditioned and blown into the passenger compartment, the ratio of the inside air to the suction amount sucked into the duct 2 is large. Since the amount of air blown into the passenger compartment through the duct 2 is increased as much as possible, unlike the conventional example in which the amount of air blown into the passenger compartment is constant regardless of the increase in the inside air with respect to the suction amount into the duct. And duct 2
It is possible to prevent the reachability of the blown air to the occupant from being deteriorated regardless of the ratio of the inside air to the intake amount to the passenger.

Further, as the ratio of the inside air to the intake amount into the duct 2 increases, the amount of the inside air blown to the occupants in the rear seats increases, so that the pressure through the rear foot duct 22 increases as the inside air ratio increases. Even if the loss increases,
It is possible to prevent the amount of warm air blown to the passengers in the rear seats from decreasing.

Further, since the present invention is applied to the upper and lower two-layer type air conditioner, it is possible to improve the energy efficiency of the blast air-conditioning barrel as compared with the configuration applied to the semi-inside air mode.

The present invention is not limited to the above embodiment, but can be modified or expanded as follows. As the air conditioner, the evaporator 11 may be located only in the first air passage 3. The air conditioner may be a semi-inside air mode type in which the outside air and the inside air sucked into the duct 2 are completely mixed and blown.

[0047]

As is apparent from the above description, the vehicle air conditioner of the present invention has the following effects. According to the first aspect of the present invention, as the ratio of the inside air to the intake amount to the air blower that air-conditions the outside air outside the vehicle cabin and the inside air inside the vehicle cabin and blows the air into the vehicle cabin, the air blown into the vehicle cabin. Since the amount of air blown is increased, it is possible to surely blow the air to the occupant regardless of the ratio of the inside air to the amount sucked into the air blower.

According to the second aspect of the present invention, the above control is executed when the air blower is set to blow air to the upper body of the occupant. Therefore, regardless of the ratio of the inside air to the amount of air sucked into the air blower. It is possible to reliably blow air to the upper body of the occupant.

According to the third aspect of the present invention, the above control is executed when the air blower is set to blow air to the feet of the occupant. Therefore, regardless of the ratio of the inside air to the amount of air sucked into the air blower. Therefore, the air can be reliably blown to the feet of the occupant.

According to the fourth aspect of the present invention, the larger the proportion of the inside air to the amount of air sucked into the blowing means, the larger the amount of air blown by the blowing means through the guide passage for blowing to the feet of the passenger in the rear seat. With this configuration, the air can be reliably blown to the feet of the passenger in the rear seat regardless of the increase in the pressure loss due to the guide passage.

According to the fifth aspect of the present invention, the first air passage for blowing the outside air into the vehicle compartment and the second air passage for blowing the inside air into the vehicle compartment are independently provided. The energy efficiency for air conditioning can be improved.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing an overall configuration in an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the control device.

FIG. 3 is a diagram showing an outlet mode with respect to a target outlet temperature.

FIG. 4 is a diagram showing a damper opening with respect to a target outlet temperature.

FIG. 5 is a diagram showing a blower voltage with respect to a target outlet temperature.

FIG. 6 is a diagram showing a total air flow rate and a head temperature with respect to an inside air ratio.

FIG. 7 is a schematic diagram showing a control state of the air conditioning unit in the face mode.

FIG. 8 is a diagram showing a total air flow rate and a rear seat foot temperature with respect to an inside air ratio.

FIG. 9 is a diagram corresponding to FIG. 7 showing a control state of the air conditioning unit in the bilevel mode.

FIG. 10 is a diagram corresponding to FIG. 7 showing the control state of the air conditioning unit in the foot mode.

FIG. 11 is a schematic diagram showing an air conditioning state in a vehicle compartment in an outside air mode in a conventional example.

FIG. 12 is a view showing an air conditioning state of a vehicle interior in an inside air mode.
1 equivalent diagram

FIG. 13 is a view showing a configuration including an outlet to a rear seat.
Corresponding figure

[Explanation of symbols]

1 is an air conditioning unit (air blower), 2 is a duct, 3 is a first
Ventilation passage, 4 is a second ventilation passage, 5 is an outside air introduction port, 6
Is an inside air inlet, 7 is an inside / outside air switching damper, 8 and 10 are blowers, 9 is an inside air inlet, 11 is an evaporator, 12 compressor, 13 is a heater core, 14 is an air mix damper, 15 is a defroster outlet, 16 is a face Outlet,
19 is a foot outlet, 21 is a front foot outlet, 2
3 is a rear foot outlet, 24 is an air volume ratio adjustment damper, 2
Reference numeral 7 is a control device (air-conditioning control means, air flow correction means).

Claims (5)

[Claims] 1. A blower means for blowing the sucked outside air outside the vehicle compartment and inside air in the vehicle compartment into the vehicle compartment in a predetermined air conditioning state, an air conditioning control means for controlling the air conditioning state of the air blowing means, and a blower for the air blowing means. An air-conditioning system for a vehicle, comprising: an air-blowing amount correcting unit that corrects the air-blowing amount by the air-blowing unit to increase as the proportion of the inside air to the suction amount increases. 2. The air conditioner for a vehicle according to claim 1, wherein the air blowing amount correcting means executes the correction when the air blowing means is set to blow air to the upper half of the occupant. 3. The air conditioner for a vehicle according to claim 1, wherein the air blowing amount correcting means performs the correction when the air blowing means is set to blow air to the feet of an occupant. 4. The blower means is provided so as to blow the inhaled air to the feet of a passenger in the front seat and blow the air to the feet of a passenger in the rear seat through a guide passage. The vehicular air-conditioning system according to claim 1, wherein the larger the proportion of the inside air with respect to the amount sucked into the means, the larger the amount of air blown through the guide passage by the air blower. 5. The blower means is provided with a first blower passage for blowing the outside air into the vehicle compartment and a second blower passage for blowing the inside air into the vehicle compartment independently of each other. The vehicle air conditioner according to any one of 1 to 4.