JP2004042711A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce heat shock applied on an occupant when getting on a vehicle and save power of an air conditioner. <P>SOLUTION: When the occupant is absent, heat shock reduction air conditioning for air conditioning based on target blow-out temperature TAO compensated by a heat shock reduction compensation value Td is performed. This heat shock reduction compensation value Td is a value for compensating the target blow-out temperature TAO when performing usual air conditioning so that vehicle room temperature Tr approaches outside air temperature Tam. Consequently, a difference in temperature ΔT between the vehicle room temperature Tr and the outside air temperature Tam when the occupant gets on the vehicle can be reduced when compared with the case when usual air conditioning is performed even during occupant's absence. As a result, heat shock applied on the occupant when getting on the vehicle can be reduced, and power of the air conditioner during occcupant's absence can be saved when compared with the case where usual air conditioning is performed even during occupant's absence. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle air conditioner.
[0002]
2. Description of the Related Art
In recent years, there has been air conditioning control that uses a remote control starter or the like to operate an air conditioner before the occupant gets into the vehicle, thereby improving the air conditioning feeling when the occupant gets into the vehicle. In addition, when the user temporarily gets off the vehicle, such as shopping for a drink or a cigarette, the air-conditioning system may be operated while the air-conditioning control during boarding is continued.
[0003]
However, when air conditioning is performed in the absence of an occupant, if air conditioning is simply performed in the same manner as air conditioning control during occupant occupancy, the temperature difference between the vehicle interior temperature and the outside air temperature when the occupant gets into the vehicle is large. A large temperature stress, a so-called heat shock, is applied to the occupant who has experienced a sudden change in physical condition.
[0004]
For example, when the air conditioning when the occupant is absent is a cooling operation when the outside air temperature is high in summer or the like, the occupant's ambient temperature changes suddenly from a high temperature outside the vehicle to a low temperature inside the vehicle, causing a heat shock to the occupant. I will join. Also, in the case where the air conditioning when the occupant is not present is a heating operation when the outside air temperature is low, such as in winter, the occupant's ambient temperature rapidly changes from a low temperature outside the vehicle to a high temperature inside the vehicle. I will join.
[0005]
In view of the above, it is an object of the present invention to reduce a heat shock applied to an occupant when getting on a vehicle, and to further reduce the power consumption of an air conditioner.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a calculating means (S50) for calculating an air-conditioning control value so that a vehicle interior temperature approaches a set temperature set by an occupant; An occupant absent determination means (S41) for determining whether the occupant is absent, and if the occupant absence is determined by the occupant absence determination means (S41), the air conditioning calculated by the arithmetic means (S50). Normal air-conditioning for performing air-conditioning control based on the control value is performed, and when it is determined that the occupant is absent by the occupant absence determining means (S41), the air-conditioning control value is corrected so that the vehicle interior temperature approaches the outside air temperature. It is characterized by performing heat shock reduction air conditioning for performing air conditioning control based on the performed air conditioning control value.
[0007]
As a result, the temperature difference between the cabin temperature and the outside air temperature when the occupant gets into the vehicle can be reduced as compared with the case where normal air conditioning is performed even when the occupant is absent, reducing heat shock applied to the occupant when getting into the vehicle. In addition, power saving of the air conditioner when the occupant is absent can be realized as compared with the case where normal air conditioning is performed even when the occupant is absent.
[0008]
Here, even if the temperature difference between the vehicle interior temperature and the outside air temperature when the user gets into the vehicle is the same, the degree of the heat shock applied to the occupant differs depending on the age of the occupant. Therefore, as in the invention according to claim 2, an age determining means for determining the age of the occupant is provided, and the correction amount of the air conditioning control value used for the heat shock reduction air conditioning is determined according to the age determined by the age determining means. If it is changed, it is possible to perform heat shock reduction air conditioning according to the age of the occupant.
[0009]
Therefore, it is possible to prevent the correction amount of the air-conditioning control value used for the heat shock reduction air-conditioning from being too large and the air-conditioning feeling when the occupant gets into the vehicle from being unnecessarily deteriorated. Further, it is possible to prevent the correction amount of the air-conditioning control value used for the heat shock reduction air-conditioning from being too small, so that the heat shock when the occupant gets into the vehicle cannot be sufficiently reduced.
[0010]
Here, even if the outside air temperature is the same, if the amount of solar radiation is different, the sensible temperature felt by a person outside the vehicle is different. Therefore,
Here, even if the outside air temperature is the same, if the amount of solar radiation is different, a person who is exposed to the sun outside the vehicle will have a different perceived temperature. Therefore, for example, in heat shock reduction air conditioning during cooling operation, if the amount of solar radiation is large even at the same outside air temperature and the same vehicle interior temperature, the heat shock when the occupant gets into the vehicle may not be sufficiently reduced. .
[0011]
On the other hand, the invention according to claim 3 is provided with solar radiation detecting means (35) for detecting the amount of solar radiation, and air conditioning used for heat shock reduction air conditioning in accordance with the amount of solar radiation detected by the solar radiation detecting means (35). Since the correction amount of the control value is changed, it is possible to perform detailed heat shock reduction air conditioning in accordance with the amount of solar radiation.
[0012]
Further, it is preferable that the air conditioning control value used for the heat shock reduction air conditioning is corrected by correcting the set temperature as in the invention described in claim 4.
[0013]
Also, as in the invention according to claim 5, the occupant absence determination means (S41) is suitable for determining that the occupant is absent when the vehicle engine is driven by remote control from outside the vehicle. .
[0014]
Further, as in the invention according to claim 6, the seat pressure detecting means (39a) for detecting the pressure applied from the seat surface is provided, and the occupant absence determining means (S41) is provided by the seat pressure detecting means (39a). It is preferable to determine that the occupant is absent when the detected pressure is equal to or less than a predetermined value.
[0015]
Further, as in the invention according to claim 7, a seat belt detecting means (39b) for detecting whether or not a seat belt is used is provided, and the occupant absence determining means (S41) is provided by the seat belt detecting means (39b). It is preferable to determine that the occupant is absent when it is detected that the belt is not used.
[0016]
Further, as in the invention according to claim 8, a door opening / closing detecting means (39c) for detecting opening / closing of a vehicle door is provided, and the occupant absent determining means (S41) is configured to detect a detection result of the door opening / closing detecting means (39c). Accordingly, it is preferable to determine that the occupant is absent.
[0017]
When the set temperature is set to the maximum value or the minimum value, fixed air-conditioning for performing air-conditioning control by fixing the target outlet temperature to a predetermined value is performed, and the occupant is occupied by the occupant absence determination means (S41). If it is determined that there is no occupant, the occupant absence determination means (S41) as in the invention according to claim 9, even in the case of a vehicle air conditioner that performs fixed air conditioning in preference to normal air conditioning. When it is determined that no occupant is present, it is preferable to prohibit fixed air conditioning and perform heat shock reduction air conditioning.
[0018]
Here, in the normal air conditioning, the outside air introduction mode may be set in order to ensure a fresh feeling of the cabin air, whereas in the heat shock reduction air conditioning of the present invention, since the occupant is absent, the interior air circulation mode is set. However, the fresh feeling is not impaired. Focusing on this point, in the invention according to claim 10, it is possible to switch between an outside air introduction mode in which outside air is introduced into the vehicle compartment to perform air conditioning and an inside air circulation mode in which inside air is circulated in the vehicle compartment to perform air conditioning. During air conditioning with reduced heat shock, the internal air circulation mode is forcibly set.
[0019]
As a result, during air conditioning with reduced heat shock, the internal air circulation mode, which has a smaller heat load than the external air introduction mode, is set, so that the heat load of the air conditioner can be reduced without impairing the freshness and energy saving of the air conditioner is achieved. Can be.
[0020]
Further, in the invention according to claim 11, there is provided a freezing window fogging detecting means for detecting at least one of freezing and window fogging of the front windshield of the vehicle, and the freezing window fogging detecting means detects freezing and fogging of the window. When at least one is detected, air conditioning when the occupant is absent is prohibited, and anti-fog air conditioning is performed in a defroster blowing mode in which conditioned air is blown toward the front windshield.
[0021]
Thereby, in the case where the front windshield freezes or fogs over the window, air conditioning when the occupant is absent can be prohibited, and vehicle driving safety can be enhanced.
[0022]
It should be noted that reference numerals in parentheses of the above-described units are examples showing the correspondence with specific units described in the embodiments described later.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0024]
FIG. 1 is an overall configuration diagram of the present embodiment, and a refrigeration cycle R of a vehicle air conditioner is provided with a compressor 1 that sucks, compresses, and discharges refrigerant. The compressor 1 has an electromagnetic clutch 2 for power interruption, and the power of the vehicle engine 4 is transmitted to the compressor 1 via the electromagnetic clutch 2 and the belt 3. The energization of the electromagnetic clutch 2 is interrupted by the air-conditioning electronic control device 5, and the operation of the compressor 1 is interrupted by the intermittent energization of the electromagnetic clutch 2.
[0025]
The high-temperature, high-pressure superheated gas refrigerant discharged from the compressor 1 flows into the condenser 6, where the refrigerant exchanges heat with outside air blown by a cooling fan (not shown) to be cooled and condensed. The refrigerant condensed in the condenser 6 then flows into the receiver 7, where gas and liquid of the refrigerant are separated inside the receiver 7, and the excess refrigerant (liquid refrigerant) in the refrigeration cycle R is discharged into the receiver 7. Stored inside.
[0026]
The liquid refrigerant from the liquid receiver 7 is decompressed to a low pressure by the expansion valve (decompression means) 8 to be in a low-pressure gas-liquid two-phase state. The expansion valve 8 is a temperature-type expansion valve having a temperature sensing portion 8a for sensing the temperature of the refrigerant at the outlet of the evaporator 9. The low-pressure refrigerant from the expansion valve 8 flows into an evaporator (cooling heat exchanger) 9. The evaporator 9 is installed in an air-conditioning case 10 of a vehicle air conditioner, and the low-pressure refrigerant flowing into the evaporator 9 absorbs heat from the air in the air-conditioning case 10 and evaporates. The outlet of the evaporator 9 is connected to the suction side of the compressor 1, and forms a closed circuit by the above-mentioned cycle components.
[0027]
In the air-conditioning case 10, a blower 11 is disposed on the upstream side of the evaporator 9, and the blower 11 is provided with a centrifugal blower fan 12 and a drive motor 13. An inside / outside air switching box 14 is arranged on the suction side of the blower fan 12, and the inside / outside air switching door 14a in the inside / outside air switching box 14 opens and closes the outside air inlet 14b and the inside air inlet 14c. As a result, outside air (vehicle outside air) or inside air (vehicle inside air) is switched and introduced into the inside / outside air switching box 14. The inside / outside air switching door 14a is driven by an electric drive device 14e including a servomotor.
[0028]
In the ventilation system of the air conditioner, the air conditioning unit 15 arranged downstream of the blower 11 is usually arranged at the center position in the vehicle width direction inside the instrument panel at the front of the passenger compartment. Is offset to the passenger seat side.
[0029]
An air mix door 19 is arranged downstream of the evaporator 9 in the air conditioning case 10. Downstream of the air mix door 19, a hot water heater core (heating heat exchanger) 20 for heating air using hot water (cooling water) of the vehicle engine 4 as a heat source is installed. On the side (upper portion) of the hot water type heater core 20, a bypass passage 21 for flowing air while bypassing the hot water type heater core 20 is formed.
[0030]
The air mix door 19 is a rotatable plate-like door, and is driven by an electric drive device 22 including a servomotor. The air mix door 19 adjusts the ratio of the amount of hot air passing through the hot water heater core 20 to the amount of cool air passing through the bypass passage 21. By adjusting the ratio of the amount of cool air and hot air, the air blown into the vehicle compartment is adjusted. Adjust the temperature. Therefore, in this example, the air mix door 19 constitutes a means for adjusting the temperature of the air blown into the vehicle interior.
[0031]
On the downstream side of the hot water type heater core 20, a hot air passage 23 extending upward from the lower side is formed, and the hot air from the hot air passage 23 and the cool air from the bypass passage 21 are mixed in the air mixing section 24, so Can produce temperature air.
[0032]
Further, in the air conditioning case 10, a blowing mode switching unit is configured downstream of the air mixing unit 24. That is, a defroster opening 25 is formed in the upper surface of the air-conditioning case 10, and the defroster opening 25 blows air to the inner surface of the vehicle windshield through a defroster duct (not shown). The defroster opening 25 is opened and closed by a rotatable plate-like defroster door 26.
[0033]
A face opening 27 is formed on the upper surface of the air-conditioning case 10 at a position behind the defroster opening 25 on the vehicle rear side, and the face opening 27 is directed toward the upper body of an occupant of the passenger compartment through a face duct (not shown). It blows out air. The face opening 27 is opened and closed by a rotatable plate-like face door 28.
[0034]
In the air-conditioning case 10, a foot opening 29 is formed below the face opening 27. The foot opening 29 blows air toward the feet of the occupant of the vehicle cabin through a foot duct (not shown). is there. The foot opening 29 is opened and closed by a rotatable plate-like foot door 30.
[0035]
The blowout mode doors 26, 28, and 30 are connected to a common link mechanism (not shown), and are driven by an electric drive device 31 including a servomotor via the link mechanism.
[0036]
Next, an outline of the electric control unit in the present embodiment will be described. As the temperature sensor of the evaporator 9, a temperature sensor 32 including a thermistor is provided. The temperature sensor 32 is disposed in the air conditioning case 10 at a position immediately after the air is blown out of the evaporator 9 and detects the evaporator blowout temperature Te.
[0037]
In addition to the temperature sensor 32 described above, the air-conditioning electronic control device 5 includes well-known sensors 33 to 36 for detecting a vehicle interior temperature Tr, an outside air temperature Tam, a solar radiation amount Ts, a hot water temperature Tw, and the like for air-conditioning control. Receives a detection signal. The air-conditioning control panel 37 installed near the instrument panel in the vehicle compartment is provided with operation switches 37a to 37e that are manually operated by occupants, and operation signals of the operation switches 37a to 37e are also input to the air-conditioning electronic control device 5. Is done.
[0038]
As the operation switches, specifically, a temperature setting switch 37a for generating a temperature setting signal Tset, an air volume switch 37b for generating an air volume switching signal, a blowing mode switch 37c for generating a blowing mode signal, and generating an inside / outside air switching signal. An inside / outside air changeover switch 37d, an air conditioner switch 37e, and the like are provided.
[0039]
The blowout mode switch 37c is used to manually switch among the face mode, foot mode, bilevel mode, foot differential mode, and defroster mode. The air conditioner switch 37e generates an ON / OFF signal for the compressor 1 and generates a signal for setting the target temperature TEO of the evaporator 9 to a lower temperature for preventing frost.
[0040]
Further, the air-conditioning electronic control device 5 is connected to the engine electronic control device 38, and the rotation speed signal and the vehicle speed signal of the vehicle engine 4 are input from the engine electronic control device 38 to the air-conditioning electronic control device 5. Is done.
[0041]
Next, the operation of the present embodiment in the above configuration will be described. The air-conditioning electronic control unit 5 is composed of a well-known microcomputer including a CPU, a ROM, a RAM and the like and its peripheral circuits. The flowchart of FIG. Is shown. Then, the control routine of FIG. 2 is started when the ignition switch of the vehicle engine 4 is turned on and power is supplied to the control device 5.
[0042]
First, a flag, a timer, and the like are initialized in step S10, and operation signals of the operation switches 37a to 37e of the air conditioning control panel 37 are read in the next step S20. In step S30, the detection signals from the sensors 32 to 36, the vehicle speed signal from the engine electronic control unit 38, and other signals of the vehicle environmental state are read.
[0043]
Next, in step S40 as a means for calculating a heat shock reduction correction value, which will be described later, a heat shock reduction correction value Td used for calculating the target outlet temperature TAO in step S50 is determined according to the detailed flowchart of FIG. The details of the determination flowchart in step S40 will be described below. First, in step S41 as an occupant absence determination unit, it is determined whether the occupant is on or off.
[0044]
Specific examples of the determination by the occupant absence determination unit S41 include a case where the vehicle engine is driven by remote operation from outside the vehicle, a case where the pressure detected by the seat pressure detection unit 39a is equal to or less than a predetermined value, and a case where the seat belt detection unit is used. It is determined that the occupant is absent in at least one of the cases where it is detected that the seat belt is not used by 39b.
[0045]
An example of the seat pressure detecting means 39a is a pressure sensor provided inside a seat surface of a vehicle seat. In addition, as an example of the seat belt detection unit 39b, a switch that is turned on / off in accordance with the attachment / detachment of the seat belt is given. Alternatively, it may be determined that the occupant is absent based on the detection result of the door opening / closing detecting means 39c.
[0046]
If it is determined in step S41 that the occupant is absent, in step S42, the heat shock reduction correction value Td is calculated and determined based on the following equation (1).
[0047]
(Equation 1)
Td = (Tam−Tr) / α
However, Tr: the vehicle compartment temperature detected by the inside air sensor 33 Tam: the outside air temperature detected by the outside air sensor 34: a temperature difference reduction constant On the other hand, if it is determined in step S41 that the occupant is in the vehicle, Then, the process proceeds to step S43, where the heat shock reduction correction value Td is determined to be zero.
[0048]
When the heat shock reduction correction value Td is determined in steps S41, S42, and S43 and the process in step S40 is completed, the process proceeds to step S50 as a calculation unit, and the target blow temperature TAO of the conditioned air blown into the vehicle compartment is calculated. calculate. The target outlet temperature TAO corresponds to the air-conditioning control value described in the claims, and is set as an outlet temperature necessary for bringing the vehicle interior temperature Tr close to the set temperature Tset set by the temperature setting switch 37a. Is calculated based on the following equation (2).
[0049]
(Equation 2)
TAO = Kset × (Tset + Td) −Kr × Tr−Kam × Tam−Ks × Ts + C
However, Ts: solar radiation amount Kset, Kr, Kam, Ks detected by solar radiation sensor 35: control gain C: correction constant Note that air conditioning based on TAO when Td = 0 is determined in step S43 is usually performed. The air conditioning based on TAO when Td = (Tam−Tr) / α is determined in step S42 is called heat shock reduction air conditioning.
[0050]
Then, as shown in Equation 2, according to the heat shock reduction air conditioning, during the cooling operation in summer, the value of TAO is corrected by Td so that the value of TAO becomes higher, and the vehicle interior temperature Tr approaches the outside air temperature Tam. It becomes. On the other hand, during the heating operation in winter, the value of TAO is corrected by Td so as to decrease, and the vehicle interior temperature Tr approaches the outside air temperature Tam. That is, in the heat shock reduction air conditioning, the target outlet temperature Tao during normal air conditioning is corrected so that the vehicle interior temperature Tr approaches the outside air temperature Tam, and the air conditioning is controlled based on the corrected target outlet temperature Tao. .
[0051]
Next, in step S60, a target air blowing amount of the air blown by the blower 11, that is, a blower voltage Ve which is a voltage applied to the blower driving motor 13 is determined based on the TAO. The method of determining the blower voltage Ve is well known. The blower voltage (target air volume) Ve is increased on the high temperature side (maximum heating side) and low temperature side (maximum cooling side) of the TAO, and the blower voltage is set in the intermediate temperature range of the TAO. The voltage (target air volume) Ve is reduced.
[0052]
Next, the inside / outside air mode is determined in step S70. The inside / outside air mode is set to the inside air circulation mode when, for example, the vehicle interior temperature Tr is significantly higher than a predetermined temperature with respect to the set temperature Tset (cooling high load), and is set to the outside air mode at other times. Alternatively, as the TAO rises from the low-temperature side to the high-temperature side, the switching may be set to the whole inside air mode → the inside / outside air mixing mode → the whole outside air mode.
[0053]
Next, in step S80, the blowing mode is determined according to the TAO. As is well known, as the TAO rises from the low-temperature side to the high-temperature side, the blow-out mode is switched and set to face mode → bi-level mode → foot mode.
[0054]
Next, in step S90, the target opening degree SW of the air mix door 19 is calculated by the following equation 3 based on the TAO, the evaporator outlet temperature Te, and the hot water temperature Tw.
[0055]
[Equation 3]
SW = [(TAO-Te) / (Tw-Te)] × 100 (%)
Here, the target opening degree SW of the air mix door 19 is set such that the maximum cooling position (solid line position in FIG. 1) of the air mix door 19 is 0%, and the maximum heating position of the air mix door 19 (dotted line position in FIG. 1). Is expressed as a percentage with 100% as the average.
[0056]
Next, proceeding to step S100, if the air conditioner switch 37e is ON, the target evaporator temperature TEO is determined according to the target blowout temperature TAO in the lowest temperature range where frost formation of the evaporator 9 can be prevented. Then, TEO is compared with the evaporator blowout temperature Te detected by the temperature sensor 32 to determine the applied voltage Vc to the electromagnetic clutch 2 and to determine whether the compressor is operating (ON-OFF). On the other hand, when the air conditioner switch 37e is turned off, the compressor 1 outputs an OFF signal.
[0057]
Next, the process proceeds to step S110, and a control signal is output to the various actuator units (2, 13, 14e, 22, 31) so that the control state determined in steps S60 to S100 is obtained. When the elapse of the control cycle τ is determined in the next step S120, the process returns to step S20.
[0058]
FIG. 4 shows that the air-conditioning control based on the above steps S10 to S120 performs the cooling operation during the operation of the vehicle, then the occupant gets off and the occupant is absent, and then the occupant gets on again and resumes the operation of the vehicle. FIG. 5 is a diagram showing a transition of a change in a vehicle interior temperature Tr until the temperature changes. The dashed line in FIG. 4 indicates the change in the vehicle interior temperature when heat shock reduction air conditioning is performed, and the two-dot chain line indicates the change in the vehicle interior temperature when normal air conditioning is performed. Is shown.
[0059]
As shown in this figure, during the absence of the occupant from the time when the occupant gets off the vehicle until the time when the occupant re-enters the vehicle, heat-shock reduction air-conditioning is performed based on the target blowing temperature Tao corrected by the heat shock reduction correction value Td. Is performed, the temperature difference ΔT between the vehicle interior temperature Tr and the outside air temperature Tam at the time when the occupant re-enters the vehicle becomes smaller as compared with the case where the normal air conditioning is performed even when the occupant is absent. The heat shock applied to the occupant can be reduced, and power saving of the air conditioner when the occupant is absent can be realized as compared with the case where normal air conditioning is performed even when the occupant is absent.
[0060]
(Other embodiments)
In carrying out the present invention, an age determining means for determining the age of the occupant is provided, and the heat shock reduction correction value Td is changed in accordance with the age determined by the age determining means, so that the heat according to the occupant's age is changed. It is preferable to perform shock reduction air conditioning.
[0061]
As a specific example of the age determination means, a switch for inputting the age of the occupant may be provided in the vehicle interior, and the age may be determined by an input operation of the switch. In recent years, an immobilizer that activates a vehicle anti-theft device by inputting personal information of an occupant when the user gets into a vehicle and comparing the registered personal information with the input personal information has been proposed. Alternatively, the age may be determined based on the age of the occupant included in the personal information.
[0062]
Further, in implementing the present invention, it is preferable that the heat shock reduction correction value Td is changed in accordance with the amount of solar radiation TS, so that fine heat shock reduction air conditioning in accordance with the amount of solar radiation TS is performed.
[0063]
In the above embodiment, the target blowout temperature Tao as an air conditioning control value used for heat shock reduction air conditioning is corrected by correcting the set temperature Tset with the heat shock reduction correction value Td. The correction of the target outlet temperature Tao in the shock reduction air conditioning is not limited to the correction of the set temperature Tset. A correction term for heat shock reduction air conditioning may be newly provided separately from the term of the set temperature Tset.
[0064]
Further, the correction of the target outlet temperature Tao in the heat shock reduction air conditioning in the present invention is not limited to the correction of the target outlet temperature Tao. For example, the value of the blower voltage Ve or the value of the outlet mode without correcting the target outlet temperature Tao. May be corrected.
[0065]
In addition, during heat shock reduction air conditioning, the inside / outside air mode is forcibly set to the inside air circulation mode to reduce the heat load of the air conditioner without impairing the fresh feeling and to save energy in the air conditioner. is there.
[0066]
By the way, conventionally, when the set temperature Tset is set to the maximum value or the minimum value, the target outlet temperature Tao is fixed to the predetermined maximum value or the minimum value regardless of the values of the outside air temperature Tam and the amount of solar radiation TS. It is known to perform fixed air conditioning for controlling air conditioning. In an air conditioner having such a function of fixed air conditioning, when no occupant is present, fixed air conditioning is prohibited and heat shock reduction air conditioning is preferably performed.
[0067]
Further, in practicing the present invention, the vehicle further includes a freezing window fogging detecting unit that detects at least one of freezing and window fogging of the front windshield of the vehicle, and at least one of freezing and window fogging is detected by the freezing window fogging detecting unit. If it is detected, air conditioning when the occupant is absent is prohibited, and the blowing mode is forcibly set to the defroster mode, so that the safety of vehicle operation is improved.
[0068]
The vehicle air conditioner further includes an infrared sensor for detecting an occupant temperature that detects the temperature of the occupant, and performs air conditioning according to the temperature detected by the infrared sensor for detecting the occupant temperature when the occupant gets on the occupant. It is preferable to determine that there is no occupant when the amount of change in the output of the sensor per unit time is equal to or greater than a predetermined amount.
[Brief description of the drawings]
FIG. 1 is an overall system diagram showing a vehicle air conditioner according to an embodiment of the present invention.
FIG. 2 is a flowchart showing air conditioning control of the vehicle air conditioner of FIG.
FIG. 3 is a flowchart showing details of a heat shock reduction correction value Td determination step in FIG. 2;
FIG. 4 is a diagram showing a change in the vehicle interior temperature Tr when heat shock reduction air conditioning is performed by the air conditioning control of FIG. 2;
[Explanation of symbols]
S41: occupant absence determination means; S50: calculation means.

Claims (11)

A calculating means (S50) for calculating an air-conditioning control value so that the vehicle interior temperature approaches the set temperature set by the occupant, and an occupant absence determining means (S41) for determining whether the occupant is on or off. Prepare
When it is determined by the occupant absence determining means (S41) that the occupant is in the vehicle, normal air-conditioning for performing air-conditioning control based on the air-conditioning control value calculated by the calculating means (S50) is performed.
When it is determined that the occupant is absent by the occupant absence determining means (S41), the air conditioning control value is corrected so that the vehicle interior temperature approaches the outside air temperature, and the air conditioning control is performed based on the corrected air conditioning control value. An air conditioner for a vehicle, which performs heat shock reducing air conditioning. An age determining means for determining the age of the occupant;
The vehicle air conditioner according to claim 1, wherein a correction amount of an air conditioning control value used for the heat shock reduction air conditioning is changed according to the age determined by the age determining means. A solar radiation detecting means (35) for detecting the amount of solar radiation;
The vehicle air conditioner according to claim 1 or 2, wherein a correction amount of an air conditioning control value used for the heat shock reduction air conditioning is changed according to the amount of solar radiation detected by the solar radiation detecting means (35). . The vehicle air conditioner according to any one of claims 1 to 3, wherein the air conditioning control value used for the heat shock reduction air conditioning is corrected by correcting the set temperature. The occupant absence determining means (S41) determines that the occupant is absent when the vehicle engine is driven by remote control from outside the vehicle, according to any one of claims 1 to 4, wherein the occupant absence is determined. Vehicle air conditioner. Sheet pressure detecting means (39a) for detecting a pressure applied from the surface of the sheet,
The occupant absence determination means (S41) determines that the occupant is absent when the pressure detected by the seat pressure detection means (39a) is equal to or less than a predetermined value. The vehicle air conditioner according to any one of the above. A seat belt detecting means (39b) for detecting whether or not the seat belt is used;
The occupant absence determining means (S41) determines that the occupant is absent when the seat belt detecting means (39b) detects that the seat belt is not used. The vehicle air conditioner according to any one of the above. A door opening / closing detecting means (39c) for detecting opening / closing of the vehicle door;
The vehicle according to any one of claims 1 to 4, wherein the occupant absence determination unit (S41) determines that the occupant is absent based on a detection result of the door opening / closing detection unit (39c). Air conditioner. When the set temperature is set to a maximum value or a minimum value, perform fixed air conditioning for air conditioning control by fixing the target outlet temperature to a predetermined value,
When the occupant absence determination means (S41) determines that the occupant is in the vehicle, the fixed air conditioning is performed in preference to the normal air conditioning,
9. The air conditioner according to claim 1, wherein when the absence of the occupant is determined by the occupant absence determination unit, the fixed air conditioning is prohibited and the heat shock reduction air conditioning is performed. 10. Vehicle air conditioner. It is possible to switch between an outside air introduction mode in which outside air is introduced into the vehicle compartment to perform air conditioning and an inside air circulation mode in which inside air is circulated in the vehicle compartment to perform air conditioning,
The vehicle air conditioner according to any one of claims 1 to 9, wherein when performing the heat shock reduction air conditioning, the interior air circulation mode is fixedly set. Freezing window fogging detection means for detecting at least one of freezing and window fogging of the front windshield of the vehicle,
When at least one of the freezing and the window fogging is detected by the frozen window fogging detecting means, perform anti-fogging air conditioning for air conditioning in a defroster blowing mode that blows toward the front windshield,
11. The anti-fogging air conditioning is performed prior to the heat shock reduction air conditioning even when the occupant absence determination means (S41) determines that the occupant is absent. The air conditioner for a vehicle according to any one of the above.

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