JP7151357B2 - Air conditioning controller - Google Patents

Description

The disclosure herein relates to air conditioning control devices.

Patent Literature 1 discloses an air conditioning control device that controls a two-layer inside/outside air type vehicle air conditioner. This air conditioning control device is in a warm-up state in which the blowout temperature of the conditioned air is rising in heating operation, and when the humidity in the passenger compartment exceeds a predetermined humidity, the air introduction mode is changed to two layers of inside and outside air. mode.

JP 2012-236495 A

As in Patent Document 1, in a conventional two-layer inside/outside air vehicle air conditioner, the two-layer inside/outside air mode is selected only during warm-up in heating operation. Therefore, there is room for improvement in the control of the two-layer inside/outside air type vehicle air conditioner capable of improving energy saving.

An object of the disclosure is to provide an air conditioning control device capable of improving energy saving.

The multiple aspects disclosed in this specification employ different technical means to achieve their respective objectives. In addition, the symbols in parentheses described in the claims and this section are examples showing the corresponding relationship with the specific means described in the embodiment described later as one aspect, and limit the technical scope. is not.

One of the disclosed air conditioning control devices includes an outside air passage (11) through which outside air flows, an inside air passage (12) through which inside air flows, a junction (14) where the inside air passage and the outside air passage join, and a junction of the inside air passage and the outside air passage. Controls the operation of a vehicle air conditioner (1) comprising a damper (73) that adjusts an open state and a compressor (42) included in a refrigeration cycle device (40) that adjusts the temperature of taken inside air and outside air. An air conditioning control device comprising: an outside air temperature acquisition unit (101) for acquiring outside air temperature; an inside air temperature acquisition unit (102) for acquiring inside air temperature; a temperature condition determining unit (106) for determining whether or not the temperature condition is satisfied based on the inside air temperature, the outside air temperature and the target temperature; An intake mode setting unit (107) for setting an internal/external air two-layer mode in which internal air and external air are simultaneously taken in and blown out with the unit opened, and the compressor output is reduced when it is determined that the temperature conditions are and an output adjustment unit (108) that reduces or stops the output of the compressor when the target temperature is outside the range of the outside air temperature and the inside air temperature and the temperature condition is satisfied. Operate in a closed state .

According to this disclosure, when temperature conditions based on the outside air temperature, the inside air temperature, and the target temperature are satisfied, the air conditioning control device reduces or stops the output of the compressor, Run layer mode. As a result, it is possible to reduce the power required to operate the compressor while adjusting the temperature of the conditioned air by mixing the outside air and the inside air. As described above, it is possible to provide an air conditioning control device capable of improving energy saving.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram of the vehicle air conditioner in 1st Embodiment. 1 is a block diagram of an air conditioning control device according to a first embodiment; FIG. 4 is a flowchart showing processing executed by an air conditioning control device in the first embodiment;

(First embodiment)
A vehicle air conditioner 1 of a first embodiment will be described with reference to FIGS. 1 to 3. FIG. The vehicle air conditioner 1 includes a refrigeration cycle device 40 , an inside/outside air unit 2 , a blower unit 3 , an air conditioning unit 4 and an air conditioning ECU 100 .

The refrigerating cycle device 40 has a compressor 42, a condenser 43, an expansion valve 44, an evaporator 41, and refrigerant pipes connecting these in a ring. The refrigerating cycle device 40 provides a vapor compression refrigerating cycle that adjusts the temperature of the air flowing through the air conditioning unit 4 by the heat of vaporization of the refrigerant.

The compressor 42 compresses the sucked refrigerant and discharges it as a high-temperature, high-pressure refrigerant. The compressor 42 is adjustable in output, such as a variable capacity compressor whose discharge capacity is adjustable. The compressor 42 may be configured to be driven by the driving force of the engine, or may be an electric compressor driven by an electric motor. The compressor 42 circulates the refrigerant in the refrigeration cycle device 40 by sucking and discharging the refrigerant. The operation of the compressor 42 is controlled by the air conditioning ECU 100 .

The condenser 43 is a heat exchanger that provides heat exchange between the refrigerant discharged from the compressor 42 and the air outside the vehicle. The condenser 43 cools the refrigerant through heat exchange to condense the vapor-phase refrigerant into a liquid-phase refrigerant. The condenser 43 is located, for example, behind the grille provided at the front end of the vehicle, adjacent to the grille.

The expansion valve 44 is a decompression device that decompresses the refrigerant that has flowed out of the condenser 43 . The expansion valve 44 causes the refrigerant to flow into the evaporator 41 in a state of low temperature and low pressure. The expansion valve 44 is provided by, for example, a fixed expansion valve whose degree of opening is fixed, a temperature-sensitive expansion valve whose degree of opening can be adjusted according to the temperature of the refrigerant, an electronic expansion valve whose degree of opening can be electronically controlled, or the like.

The evaporator 41 is a heat exchanger that provides heat exchange between the refrigerant flowing inside and the air flowing inside the air conditioning case 10 . The evaporator 41 is housed inside the air conditioning case 10 . The evaporator 41 is connected to the outflow side of the expansion valve 44 and the inflow side of the compressor 42 . The evaporator 41 internally evaporates the refrigerant that has flowed in at low temperature and low pressure. The evaporator 41 is a cooling heat exchanger that cools the blown air with the latent heat of evaporation of the refrigerant.

The inside/outside air unit 2, the blower unit 3, and the air conditioning unit 4 are installed between the instrument panel and the dash panel in front of the vehicle interior. The inside/outside air unit 2 is attached above the blower unit 3 . The inside/outside air unit 2 has an outside air intake port 10 a and an inside air intake port 10 b formed in the unit case, and an inside/outside air switching door 20 .

The outside air intake port 10a communicates with the outside of the vehicle via a duct or the like, and is an opening through which air outside the vehicle (outside air) can flow. The inside air intake port 10b communicates with the vehicle interior, and is an opening through which air (inside air) in the vehicle interior can flow.

The inside/outside air switching door 20 is a damper that can adjust the opening area ratio between the outside air intake port 10a and the inside air intake port 10b. The inside/outside air switching door 20 is provided by, for example, a sliding door. The position of the inside/outside air switching door 20 is controlled by the air conditioning ECU 100 . The inside/outside air switching door 20 can realize an outside air introduction mode, an inside air circulation mode, and an inside/outside air two-layer mode as an air intake mode depending on the position of the door.

The inside/outside air switching door 20 closes the inside air intake port 10b and opens the outside air intake port 10a, thereby realizing an outside air introduction mode in which only the outside air is taken in substantially. The inside/outside air switching door 20 opens the inside air intake port 10b and closes the outside air intake port 10a, thereby realizing an inside air circulation mode in which only inside air is taken in substantially. The inside/outside air switching door 20 opens both the outside air intake port 10a and the inside air intake port 10b at a predetermined opening area ratio, thereby realizing an inside/outside air two-layer mode in which outside air and inside air are taken in at the same time.

The blower unit 3 has an outside air side fan 31, an inside air side fan 32, a motor 33 that rotationally drives the two fans 31 and 32, and a case that accommodates them. The outside air-side fan 31 and the inside air-side fan 32 are vertically stacked and connected to a motor 33 by a common rotating shaft. The outside air side fan 31 blows the outside air taken in from the outside air intake port 10 a to the outside air passage 11 . The inside air side fan 32 blows the inside air taken in from the inside air intake port 10 b to the inside air passage 12 .

The air conditioning unit 4 is provided downstream of the blower unit 3 in the air flow. The air conditioning unit 4 adjusts the temperature of the air blown from the blower unit 3 and blows the air into the vehicle compartment as conditioned air. The air conditioning unit 4 has an air conditioning case 10 , an evaporator 41 , an air mix door 50 , a heater core 60 , a heating device 61 and a plurality of blowout doors 71 , 72 , 73 .

The air-conditioning case 10 is made of a resin material such as polypropylene, which has a certain degree of elasticity and excellent strength. The air conditioning case 10 is formed by combining and coupling a plurality of divided bodies.

The air conditioning case 10 provides an outside air passage 11 and an inside air passage 12 through which air blown from the blower 30 flows. The two passages 11 and 12 are defined by a partition plate 13 that vertically partitions the interior of the air conditioning case 10 . The partition plate 13 partitions from the upstream side of the evaporator 41 to the downstream side of the heater core 60 . The outside air passage 11 is a passage through which air blown by the outside air side fan 31 circulates. The inside air passage 12 is a passage formed below the outside air passage 11, and is a passage through which the air blown by the inside air side fan 32 circulates. The outside air passage 11 and the inside air passage 12 join at a junction 14 formed between the downstream end of the partition plate 13 and the wall surface of the air conditioning case 10 on the downstream side.

An evaporator 41 , an air mix door 50 and a heater core 60 are arranged in the outside air passage 11 and the inside air passage 12 . The evaporator 41 is arranged across both the outside air passageway 11 and the inside air passageway 12 entirely. In other words, the evaporator 41 is arranged so as to be able to exchange heat with substantially all of the air passing through the air conditioning case 10 .

The air mix door 50 is provided by various door members such as a slide door and a film door. One air mix door 50 is provided in each of the outside air passage 11 and the inside air passage 12 . The air mix door 50 adjusts the flow rate ratio between the air flowing through the heater core 60 and the air bypassing the heater core 60 .

The heater core 60 is provided downstream of the evaporator 41 . A detour passage, which is a passage for air bypassing the heater core 60 , is formed above the heater core 60 in the outside air passage 11 and below the heater core 60 in the inside air passage 12 . The heater core 60 is a heat exchanger that provides heat exchange between blown air passing through the heat exchange section and engine cooling water flowing inside. That is, the heater core 60 heats the blown air with the engine cooling water.

A heating device 61 such as an electric heater for heating the passing inside air is provided downstream of the heater core 60 on the inside air passage 12 side. The heating device 61 is an auxiliary heat source that assists the heating of the inside air by the heater core 60 .

A defroster opening 81 , a face opening 82 , and a foot opening 83 are provided on the downstream side of the air passages 11 and 12 in the air conditioning case 10 .

The defroster opening 81 is an opening provided above the partition plate 13, that is, on the outside air passage 11 side in the vertical direction. Therefore, outside air easily flows into the defroster opening 81 . The defroster opening 81 is provided above the face opening 82 . The defroster opening 81 communicates via a duct or the like with a defroster outlet that blows air toward the windshield.

The face opening 82 is provided on the outside air passage 11 side in the vertical direction. That is, outside air is likely to flow into the face opening 82 . The face opening 82 is an opening provided below the defroster opening 81 and above the foot opening 83 . The face opening 82 communicates via a duct or the like with a face air outlet that blows air toward the passenger's upper body.

The foot opening 83 is provided below the partition plate 13, that is, on the inside air passage 12 side in the vertical direction. Therefore, inside air is likely to flow into the foot opening 83 . The foot opening 83 is an opening provided below the defroster opening 81 and the face opening 82 . That is, the foot opening 83 is formed closer to the inside air passage 12 than to the outside air passage 11 . The inside air flowing through the inside air passage 12 flows into the foot opening 83 . The foot opening 83 is communicated via a duct or the like with a foot outlet that opens into the passenger compartment and blows air toward the feet of the occupant.

The air conditioning case 10 includes a defroster door 71 for adjusting the opening area of the defroster opening 81, a face door 72 for adjusting the opening area of the face opening 82, and a foot door 73 for adjusting the opening area of the foot opening 83 as blowout doors. is provided. These blowout doors 71 , 72 , 73 adjust the flow rate of air blown out from the corresponding openings 81 , 82 , 83 .

Additionally, the foot door 73 adjusts the opening area of the confluence portion 14 . The foot door 73 is provided by a butterfly door having a door plate for adjusting the opening area of the foot opening portion 83 and a door plate for adjusting the opening area of the confluence portion 14 . The foot door 73 completely opens the junction portion 14 when the foot opening portion 83 is completely closed, and completely closes the junction portion 14 when the foot opening portion 83 is completely opened. The foot door 73 is an example of a damper that adjusts the open state of the confluence section 14 .

The blow-out doors 71 , 72 , 73 have their operations controlled by the air conditioning ECU 100 . Blow-out doors 71 , 72 , 73 realize various blow-out modes by controlling the respective door positions by the air conditioning ECU 100 . Blow-out modes include defroster mode, face mode, bi-level mode, foot mode and foot defroster mode.

The defroster mode is a mode in which the defroster door 71 opens the defroster opening 81 and the conditioned air is blown out from the defroster outlet. In the defroster mode, foot door 73 closes foot opening 83 and opens junction 14 .

The face mode is a mode in which the face door 72 is opened and conditioned air is blown out from the face outlet. In the face mode, foot door 73 closes foot opening 83 and opens junction 14 . Face mode is also called vent mode.

The bi-level mode is a mode in which the face opening 82 and the foot opening 83 are opened by the face door 72 and the foot door 73, and conditioned air is blown out from the face outlet and the foot outlet, respectively. In the bi-level mode, the foot door 73 opens the confluence section 14 to a predetermined degree of opening. The bilevel mode and the face mode are blowout modes in which the confluence section 14 is opened, and are blowout modes in which conditioned air is blown out from the face blowout port.

The foot mode is a mode in which the foot opening 83 is opened by the foot door 73 and the conditioned air is blown out from the foot outlet. In foot mode, the foot door 73 closes the confluence section 14 . Foot mode is also called heat mode.

The foot defroster mode is a mode in which the defroster opening 81 and the foot opening 83 are opened by the defroster door 71 and the foot door 73, and conditioned air is blown out from the defroster outlet and the foot outlet. The foot door 73 closes the junction 14 in the foot defroster mode.

As shown in FIG. 2, the air conditioning ECU 100 operates the vehicle air conditioner 1 based on detection information from various sensors provided in the vehicle, input information from operation switches provided on an instrument panel or the like, and the like. Control. The various sensors include an inside air temperature sensor 91 that detects the inside air temperature Tr, an outside air temperature sensor 92 that detects the outside air temperature Tam, and a humidity sensor 93 that detects the humidity inside the passenger compartment. The operation switches include a blowout mode switch 94 for setting the blowout mode of the vehicle air conditioner 1, an eco mode switch 95 for setting ON/OFF of the eco mode, which will be described later, and the like.

Air-conditioning ECU 100 includes a microcomputer having a computer-readable storage medium as a main hardware element. The storage medium is a non-transitional physical storage medium that non-temporarily stores a predetermined computer-readable program. A storage medium may be provided by a semiconductor memory, a magnetic disk, or the like. The air conditioning ECU 100 has a function of executing various control processes by executing various programs stored in a storage medium using a processor such as a CPU. The means and/or functions provided by the air-conditioning ECU 100 can be provided by software recorded in a storage medium and a computer executing the software, only software, only hardware, or a combination thereof. For example, when the air conditioning ECU 100 is provided by an electronic circuit that is hardware, it can be provided by a digital circuit including many logic circuits or an analog circuit.

Air-conditioning ECU 100 is one of a plurality of ECUs (Electronic Control Units) mounted on a vehicle. Alternatively, the configuration may be such that a plurality of ECUs share the functions of the air conditioning ECU 100 . The air conditioning ECU 100 is an example of an air conditioning control device.

The air conditioning ECU 100 includes, as functional blocks, an outside air temperature acquisition unit 101, an inside air temperature acquisition unit 102, a humidity acquisition unit 103, a humidity determination unit 104, a target temperature determination unit 105, a temperature condition determination unit 106, an intake mode setting unit 107, an output An adjusting unit 108 and an interrupting unit 109 are provided. The air conditioning ECU 100 can implement an eco mode in which the temperature of the conditioned air is adjusted while the output of the compressor 42 is reduced or stopped as the temperature condition is met.

The outside air temperature acquisition unit 101 acquires detection information of the outside air temperature Tam output from the outside air temperature sensor 92 . The inside air temperature acquisition unit 102 acquires detection information of the inside air temperature Tr output from the inside air temperature sensor 91 . The humidity acquisition unit 103 acquires humidity detection information output from the humidity sensor 93 .

Humidity determination unit 104 determines whether the humidity in the vehicle compartment exceeds the humidity threshold. The humidity threshold is a humidity threshold at which window fogging may occur. The humidity threshold value is calculated, for example, based on the data of the air moisture diagram stored in the memory of the air conditioning ECU 100 and the acquired information such as the outside air temperature. The humidity determination unit 104 performs the above determination when the foot mode or the foot defroster mode is set as the blowing mode. The humidity determination unit 104 first determines whether or not the foot mode or the foot defroster mode is set as the blowout mode, and determines whether the humidity exceeds the humidity threshold when it is determined that these blowout modes are set. can also be said to determine Humidity determination section 104 outputs the determination result to intake mode setting section 107 .

The target temperature determining unit 105 determines the target temperature of the conditioned air blown into the vehicle compartment. The target temperature determining unit 105 calculates a target outlet temperature Tao determined by correcting the set temperature Tset in consideration of the air conditioning heat load and acquires the calculated value as the target temperature. The target blowing temperature Tao is calculated, for example, by the following formula 1.

(Formula 1)
Tao = Kset x Tset - Kr x Tr - Kam x Tam - Ks x Ts + C
Here, Ts is the amount of solar radiation detected by the solar radiation sensor. Kset, Kr, Kam, and Ks are control gains, and C is a correction constant. The target temperature determination unit 105 is an example of a target temperature acquisition unit.

A temperature condition determination unit 106 determines whether temperature conditions are satisfied based on the target blowout temperature Tao, the inside air temperature Tr, and the outside air temperature Tam. The temperature condition determining unit 106 determines that the temperature condition is satisfied when the target blowing temperature Tao is within a predetermined temperature range including the inside air temperature Tr and the outside air temperature Tam. The temperature condition is the relationship among the target blowing temperature Tao, the inside air temperature Tr, and the outside air temperature Tam that can generate the conditioned air of the target blowing temperature Tao by mixing the inside air and the outside air.

The temperature condition determining unit 106 determines whether or not the temperature condition is satisfied only when the face mode or the bilevel mode is set as the blowing mode. In other words, the temperature condition determination unit 106 determines whether the temperature condition is satisfied only when the blowout mode in which the confluence unit 14 is opened is set. The temperature condition determining unit 106 first determines whether or not the face mode or the bilevel mode is set as the blowing mode, and if it is determined that these blowing modes are set, whether the temperature condition is satisfied. It can also be said that it determines whether or not.

The temperature condition determining unit 106 determines that the temperature condition is satisfied when the target blowing temperature Tao is within the range between the inside air temperature Tr and the outside air temperature Tam. That is, the temperature condition determination unit 106 determines that the temperature condition is satisfied when the conditioned air at the target blowing temperature Tao can be achieved only by mixing the inside air and the outside air without performing temperature adjustment by the refrigeration cycle device 40. .

In addition, even when the target blowout temperature Tao is outside the range between the inside air temperature Tr and the outside air temperature Tam, the temperature condition determination unit 106 adjusts the conditioned air to the target blowout temperature Tao by using the low output mode of the compressor 42, which will be described later. If the temperature can be reached, it is determined that the temperature condition is established. Temperature condition determination section 106 outputs the determination result to intake mode setting section 107 and output adjustment section 108 .

The intake mode setting unit 107 adjusts the door position of the inside/outside air switching door 20 based on the determination result of the temperature condition determination unit 106 . More specifically, when it is determined that the temperature condition is satisfied, the intake mode setting unit 107 implements the inside/outside air two-layer mode.

In addition, the intake mode setting unit 107 adjusts the intake ratio of outside air and inside air based on the relationship among the temperatures Tao, Tr, and Tam. That is, the intake mode setting unit 107 controls the inside/outside air switching door 20 so as to adjust the mixing ratio of the outside air and the inside air that merge at the confluence unit 14 so that the blowout temperature approaches the target blowout temperature Tao. For example, the intake mode setting unit 107 adjusts the door position of the inside/outside air switching door 20 so that the intake ratio of the inside air or the outside air having a larger temperature difference with the target blowing temperature Tao is increased.

In addition, when it is determined that the temperature condition is not satisfied, the intake mode setting unit 107 sets the internal air circulation mode. That is, when the conditioned air cannot reach the target blowing temperature Tao by mixing outside air and inside air, the intake mode setting unit 107 sets an air intake mode that prioritizes reduction of ventilation loss.

Also, the intake mode setting unit 107 adjusts the door position of the inside/outside air switching door 20 based on the determination result of the humidity determination unit 104 . Specifically, when it is determined that the humidity exceeds the humidity threshold, the intake mode setting unit 107 sets the inside/outside air two-layer mode. In this case, the intake ratios of inside air and outside air are set to be approximately the same. Also, when it is determined that the humidity is below the humidity threshold, the intake mode setting unit 107 sets the internal air circulation mode.

The output adjustment unit 108 adjusts the output of the compressor 42 based on the establishment of the temperature condition and the relationship between the temperatures Tao, Tr, and Tam in order to execute the eco mode. The output adjustment unit 108 stops the operation of the compressor 42 when the temperature condition is satisfied in a state where the target blowout temperature Tao is within the range between the inside air temperature Tr and the outside air temperature Tam.

The output adjustment unit 108 operates the compressor 42 in the low output mode when the temperature condition is satisfied and the target blowing temperature Tao is outside the range between the inside air temperature Tr and the outside air temperature Tam. . Here, the low output mode is a mode in which the compressor 42 is operated with a lower output than when the temperature condition is not satisfied. For example, the output adjustment unit 108 reduces the output of the compressor 42 by limiting the maximum output of the compressor 42 more than when the temperature condition is not satisfied in the low output mode. The output adjustment unit 108 adjusts the output of the compressor 42 by adjusting the capacity, rotation speed, etc. of the compressor 42 .

The output adjustment unit 108 and the intake mode setting unit 107 implement the eco mode by the above-described processing that is executed when the temperature condition is established. That is, in the eco mode, the air-conditioning ECU 100 takes in the inside air and the outside air at the same time using the inside/outside air two-layer mode and mixes them in the confluence section 14, thereby causing the refrigeration cycle device 40 to operate in a stopped state or at a low output. To realize temperature adjustment of air-conditioning air in a state where

The interruption unit 109 interrupts the setting of the two-layer inside/outside air mode based on the establishment of the temperature condition based on an instruction from the passenger. For example, when the eco mode switch 95 is OFF, the interruption unit 109 interrupts the setting of the two-layer inside/outside air mode based on the establishment of the temperature condition. When the eco mode switch 95 is OFF, the interruption unit 109 does not allow the temperature condition determination unit 106 to determine whether the temperature condition is satisfied, even in the face mode or the bilevel mode, and allows the inside air circulation mode to be performed. .

Next, an example of air conditioning control executed by the air conditioning ECU 100 of the first embodiment will be described with reference to the flowchart of FIG.

First, in step S10, the air conditioning ECU 100 determines whether or not the blowout mode is the defroster mode. If it is determined that the defroster mode is on, the process proceeds to step S15. In step S15, the air intake mode is set to the outside air introduction mode. After completing the process of step S15, the process returns to step S10.

If it is determined in step S10 that the blowout mode is not the defroster mode, the process proceeds to step S20. In step S20, it is determined whether the blowing mode is the face mode or the bi-level mode, that is, whether it is the blowing mode for blowing the conditioned air from the face blower port. If it is determined that the current mode is neither the face mode nor the bi-level mode, ie, the foot mode or the foot defroster mode, the process proceeds to step S23. In step S23, the humidity threshold is calculated and the process proceeds to step S25.

In step S25, it is determined whether or not the humidity in the passenger compartment exceeds the humidity threshold. If it is determined that the humidity threshold value is not exceeded, the process advances to step S45 to set the air intake mode to the inside air circulation mode. By the processing in steps S25 and S45, when anti-fogging is not necessary, priority is given to reducing ventilation loss by setting the inside air circulation mode.

If it is determined in step S25 that the humidity exceeds the humidity threshold, the process proceeds to step S60. In step S60, the inside/outside air two-layer mode is set. By the processing in steps S25 and S60, the inside/outside air two-layer mode is set in which outside air can be blown out when anti-fogging is required.

On the other hand, if it is determined in step S20 that the blowing mode is the face mode or the bi-level mode, the process proceeds to step S30. In step S30, it is determined whether the eco mode is ON. If it is determined that the eco mode is OFF, the process proceeds to step S45 to set the inside air circulation mode.

If it is determined that the eco mode is ON, the process proceeds from step S30 to step S40. In step S40, it is determined whether or not temperature conditions are satisfied. If it is determined that the temperature condition is not satisfied, the process proceeds to step S45 to set the inside air circulation mode.

On the other hand, if it is determined that the temperature condition is satisfied, the process proceeds from step S40 to step S50. In step S50, it is determined whether or not the target blowout temperature Tao is within the range between the outside air temperature Tam and the inside air temperature Tr. If it is out of range, the process proceeds from step S50 to step S52. In step S52, the compressor 42 is set to the low output mode, and the process proceeds to step S60 to set the inside/outside air two-layer mode. After completing the process of step S60, the process proceeds to step S10.

On the other hand, when it is determined that the target blowout temperature Tao is within the range between the outside air temperature Tam and the inside air temperature Tr, the process proceeds to step S54 and the operation of the compressor 42 is stopped. After that, the process proceeds to step S60 to set the inside/outside air two-layer mode, and then the process returns to step S10.

Next, the configuration and effects of the air conditioning ECU 100 of the first embodiment will be described.

The air conditioning ECU 100 includes an outside air temperature acquisition unit 101 that acquires the outside air temperature Tam, an inside air temperature acquisition unit 102 that acquires the inside air temperature Tr, and a target temperature determination unit 105 that acquires the target blowing temperature Tao of the conditioned air blown into the passenger compartment. have. The air conditioning ECU 100 has a temperature condition determination unit 106 that determines whether temperature conditions are satisfied based on the inside air temperature Tr, the outside air temperature Tam, and the target blowout temperature Tao. The air conditioning ECU 100 has an intake mode setting unit 107 that sets the inside/outside air two-layer mode with the confluence 14 opened when it is determined that the temperature condition is satisfied. In addition, the air conditioning ECU 100 has an output adjustment section 108 that reduces or stops the output of the compressor 42 when it is determined that the temperature condition is satisfied.

According to this, when the outside air temperature Tam, the inside air temperature Tr, and the target blowing temperature Tao satisfy the temperature conditions, the output of the compressor 42 is reduced or stopped, and the merging section 14 is opened to open the inside/outside air two-layer mode. to run. As a result, it is possible to reduce the power required to operate the compressor 42 while adjusting the temperature of the conditioned air by mixing the outside air and the inside air. As described above, it is possible to provide an air conditioning control device capable of improving energy saving.

In addition, the conditioned air flowing out from the face opening 82 provided on the side of the outside air passage 11 in the vehicle air conditioner 1 of the first embodiment can have a relatively large proportion of outside air. Therefore, the air-conditioning ECU 100 can supply air containing a relatively large amount of fresh outside air to the area around the face of the occupant, thereby improving the comfort of the occupant.

The temperature condition determining unit 106 determines that the temperature condition is satisfied when the target blowing temperature Tao is within a predetermined temperature range including the inside air temperature Tr and the outside air temperature Tam. According to this, the temperature condition determining unit 106 can more reliably determine whether or not the conditioned air can be brought closer to the target blowing temperature Tao by mixing the inside air and the outside air.

The output adjustment unit 108 stops the operation of the compressor 42 when the target blowing temperature Tao is within the range between the outside air temperature Tam and the inside air temperature Tr and the temperature condition is satisfied. According to this, the output adjustment unit 108 stops the operation of the compressor 42 when the mixture of the outside air and the inside air allows the conditioned air to reach the target blowing temperature Tao. As a result, the air conditioning ECU 100 can provide the air conditioning ECU 100 capable of performing control to further improve energy saving by bringing the conditioned air closer to the target blowing temperature Tao without using the refrigeration cycle device 40 .

The output adjustment unit 108 operates the compressor 42 with a reduced output when the temperature condition is satisfied while the target blowout temperature Tao is outside the range between the outside air temperature Tam and the inside air temperature Tr. According to this, even if the conditioned air cannot reach the target blowing temperature Tao only by mixing the outside air and the inside air, the air conditioning ECU 100 can reduce the conditioned air to the target blowing temperature Tao while improving the energy saving performance. It is possible to control the air conditioning to bring it closer to

The intake mode setting unit 107 sets the inside/outside air two-layer mode based on the establishment of the temperature condition when the blowing mode is the face mode or the bilevel mode. According to this, the intake mode setting unit 107 sets the inside/outside air two-layer mode based on the establishment of the temperature condition in the case of the blow-out mode in which the confluence unit 14 is opened. That is, the air conditioning ECU 100 determines whether or not to set the inside/outside air two-layer mode based on the establishment of the temperature condition based on the blowout mode, thereby opening the confluence section 14 when the inside/outside air two-layer mode is set. Inside air and outside air can be mixed without implementing any kind of control.

The intake mode setting unit 107 sets an inside air circulation mode in which inside air is taken in and blown out when it is determined that the temperature condition is not satisfied. When the blow-out mode is the face mode or the bi-level mode, it can be estimated that the vehicle air conditioner 1 is performing cooling operation. Therefore, by setting the inside air circulation mode when the temperature condition is not satisfied, the air conditioning ECU 100 can quickly shift to the inside air circulation mode in which the ventilation loss is suppressed under a situation where the possibility of window fogging is low.

The air conditioning ECU 100 has a humidity determination unit 104 that determines whether or not the humidity in the vehicle compartment is below the humidity threshold when the blow-out mode is the foot mode or the foot defroster mode. The intake mode setting unit 107 sets the inside/outside air two-layer mode regardless of whether the temperature condition is satisfied when it is determined that the humidity is below the humidity threshold.

According to this, when the blowing mode is the foot mode or the foot defroster mode, the air conditioning ECU 100 sets the inside/outside air two-layer mode based on the determination of the humidity determination unit 104 instead of the temperature condition determination unit 106 . When the blow-out mode is the foot mode or the foot defroster mode, it can be estimated that the vehicle air conditioner 1 is performing heating operation. Therefore, it is possible to give priority to determining whether the inside/outside air two-layer mode can be performed based on the determination of the humidity in the blowing mode in which there is a high possibility that window fogging is more likely to occur.

The air conditioning ECU 100 has a suspending unit 109 that suspends the setting of the two-layer inside/outside air mode based on the establishment of the temperature condition based on the operation of the passenger. According to this, setting of the two-layer inside/outside air mode based on the establishment of the temperature condition is performed only when the occupant desires, so that the occupant can select whether or not to perform the air conditioning control with priority on the improvement of energy saving. Therefore, it is possible to provide the air conditioning ECU 100 with improved convenience for passengers.

(Other embodiments)
The disclosure herein is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations thereon by those skilled in the art. For example, the disclosure is not limited to the combinations of parts and/or elements shown in the embodiments. The disclosure can be implemented in various combinations. The disclosure can have additional parts that can be added to the embodiments. The disclosure encompasses omitting parts and/or elements of the embodiments. The disclosure encompasses permutations or combinations of parts and/or elements between one embodiment and another. The disclosed technical scope is not limited to the description of the embodiments. The disclosed technical scope is indicated by the description of the claims, and should be understood to include all changes within the meaning and range of equivalents to the description of the claims. .

In the embodiment described above, the foot door 73 controls the open state of the confluence section 14 . Instead of or in addition to this, for example, an opening may be provided in the door plate portion of the foot door 73 that opens and closes the confluence portion 14, and a sub door that opens and closes this opening may be provided. By controlling the sub-door by the air conditioning ECU 100, the open state of the junction section 14 can be controlled regardless of whether the foot door 73 is open or closed. Further, the door that opens and closes the foot opening 83 and the door that opens and closes the junction 14 may be configured as different doors that can be independently controlled.

The air conditioning ECU 100 selects and executes either stopping the compressor 42 or operating it in the low output mode when the temperature condition is established. Alternatively, the air conditioning ECU 100 may be configured to execute only one of them. For example, the air conditioning ECU 100 determines that the temperature condition is established only when the target blowout temperature Tao is within the range between the outside air temperature Tam and the inside air temperature Tr, stops the operation of the compressor 42, and does not execute the low output mode. There may be. Further, the air conditioning ECU 100 may be configured to operate the compressor 42 in the low output mode without stopping the compressor 42 even when the target blowout temperature Tao is within the range between the outside air temperature Tam and the inside air temperature Tr.

In the above-described embodiment, the air conditioning ECU 100 sets the internal air circulation mode when the temperature condition is not satisfied. In addition to this, the air conditioning ECU 100 may be configured to set the outside air introduction mode or the inside/outside air two-layer mode when another predetermined condition is met even if the temperature condition is not met. For example, the air conditioning ECU 100 may be configured to set the outside air introduction mode or the inside/outside air two-layer mode when the temperature condition is not satisfied and the target blowout temperature Tao is higher than the outside air temperature Tam by a predetermined value or more. Further, the air conditioning ECU 100 may be configured to set the outside air introduction mode or the inside/outside air two-layer mode when the temperature condition is not satisfied and the humidity exceeds the threshold humidity.

In the above-described embodiment, the air conditioning ECU 100 determines the temperature condition when the eco mode is turned on by the eco mode switch 95, but the air conditioning ECU 100 may be applied to a vehicle without the eco mode switch 95. . In this case, the air conditioning ECU 100 may be configured to proceed to step S40 without executing the processing of step S30 in the flowchart of FIG. 3, for example.

1 vehicle air conditioner 101 outside temperature acquisition unit 102 inside temperature acquisition unit 104 humidity determination unit 105 target temperature determination unit (target temperature acquisition unit) 106 temperature condition determination unit 107 intake mode setting unit 108 output Adjustment part 109 Interruption part 11 Outside air passage 12 Inside air passage 14 Junction part 40 Refrigerating cycle device 42 Compressor 73 Foot door (damper).

Claims (7)

An outside air passage (11) through which outside air flows, an inside air passage (12) through which inside air flows, a junction (14) where the inside air passage and the outside air passage join together, and a damper (14) for adjusting the open state of the junction. 73), and a compressor (42) included in a refrigeration cycle device (40) for adjusting the temperatures of the taken inside air and the outside air. hand,
an outside temperature acquisition unit (101) for acquiring outside temperature;
an inside air temperature acquisition unit (102) for acquiring inside air temperature;
a target temperature acquisition unit (105) for acquiring the target temperature of the air-conditioned air blown into the passenger compartment;
a temperature condition determination unit (106) that determines whether a temperature condition is satisfied based on the inside air temperature, the outside air temperature, and the target temperature;
an intake mode setting unit (107) for setting an inside/outside air two-layer mode in which the inside air and the outside air are simultaneously taken in and blown out in a state where the junction is opened when it is determined that the temperature condition is satisfied; ,
an output adjustment unit (108) that reduces or stops the output of the compressor when it is determined that the temperature condition is satisfied;
with
The output adjustment unit is an air conditioning control device that operates the compressor in a state where the output is reduced when the target temperature is outside the range between the outside air temperature and the inside air temperature and the temperature condition is satisfied . 2. The air conditioning control device according to claim 1, wherein the temperature condition determination unit determines that the temperature condition is satisfied when the target temperature is within a predetermined temperature range including the inside air temperature and the outside air temperature. 3. According to claim 1 or 2, the output adjustment unit stops the operation of the compressor when the target temperature is within a range between the outside air temperature and the inside air temperature and the temperature condition is satisfied. Air conditioning controller as described. 4. The intake mode setting unit according to any one of claims 1 to 3 , wherein the intake mode setting unit sets the inside/outside air two-layer mode based on the establishment of the temperature condition when the blowing mode is the face mode or the bilevel mode. The air conditioning control device according to . 5. The air conditioning control device according to claim 4 , wherein the intake mode setting unit sets an inside air circulation mode in which the inside air is taken in and blown out when it is determined that the temperature condition is not satisfied. A humidity determination unit (104) that determines whether the humidity in the vehicle compartment is below a threshold value when the blowout mode is the foot mode or the foot defroster mode,
The intake mode setting unit, when it is determined that the humidity is below the threshold value, sets the two-layer inside/outside air mode regardless of whether the temperature condition is satisfied. 6. The air conditioning control device according to any one of 5 . 7. The air conditioning control device according to any one of claims 1 to 6 , further comprising an interruption unit (109) for interrupting setting of the two-layer inside/outside air mode based on establishment of the temperature condition based on operation by a passenger.

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