CN110573861B - Dust concentration detection device - Google Patents

Dust concentration detection device Download PDF

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Publication number
CN110573861B
CN110573861B CN201880024046.3A CN201880024046A CN110573861B CN 110573861 B CN110573861 B CN 110573861B CN 201880024046 A CN201880024046 A CN 201880024046A CN 110573861 B CN110573861 B CN 110573861B
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China
Prior art keywords
air
dew condensation
dust sensor
dust
vehicle
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CN201880024046.3A
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Chinese (zh)
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CN110573861A (en
Inventor
中嶋健太
熊田辰己
河合孝昌
石黑俊辅
石山尚敬
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Denso Corp
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Denso Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection

Abstract

The dust concentration detection device of the present invention includes: a dust sensor (32) having a light emitting section (321) that emits light and a light receiving section (322) that receives light, and that detects the concentration of dust contained in air by the light receiving section receiving reflected light reflected by the dust contained in the air from the light emitted by the light emitting section; a condensation determination unit (S80) for determining whether condensation has occurred in the dust sensor; a condensation amount estimation unit (S110) that estimates the amount of condensation that has occurred in the dust sensor using at least one of the temperature and the humidity of the air around the dust sensor when it is determined by the condensation determination unit that condensation has occurred in the dust sensor; and a dew condensation elimination time determination unit (S130) that determines a dew condensation elimination time until dew condensation generated in the dust sensor is eliminated, based on the dew condensation amount estimated by the dew condensation amount estimation unit.

Description

Dust concentration detection device
Cross reference to related applications
The present application is based on japanese patent application No. 2017-166858, filed on 31/8/2017, and the contents of the description thereof are incorporated herein by reference.
Technical Field
The present invention relates to a dust concentration detection device including a dust sensor that detects a concentration of dust contained in air.
Background
Conventionally, there is a ventilator described in patent document 1. The ventilation device is provided with a dust sensor which has a light-emitting portion and a light-receiving portion, and detects airborne particles in the air by the light-receiving portion receiving reflected light obtained by reflecting light emitted from the light-emitting portion by the airborne particles.
The ventilation device is provided with: a sensor housing portion provided to face an air passage inside a housing of the ventilator; and a damper disposed at a boundary between the air passage and the sensor housing section in the housing of the ventilator, wherein the damper is closed without detecting floating particles in order to prevent erroneous determination and failure of the dust sensor when dew condensation has occurred on the light emitting section and the light receiving section of the dust sensor.
Documents of the prior art
Patent literature
Patent document 1: japanese laid-open patent publication No. 2015-25587
According to the study of the inventors of the present invention, when the dew condensation of the dust sensor is eliminated after the dew condensation has occurred in the dust sensor, the ventilator described in patent document 1 cannot accurately determine that the dew condensation of the dust sensor is eliminated.
Disclosure of Invention
The object of the present invention is to accurately determine that dew condensation on a dust sensor has been eliminated when dew condensation on the dust sensor has been eliminated.
According to an aspect of the present invention, a dust concentration detection device includes: a dust sensor that has a light-emitting portion that irradiates light and a light-receiving portion that receives light, and that detects a concentration of dust contained in air by the light-receiving portion receiving reflected light that is obtained by reflecting the light irradiated from the light-emitting portion by the dust contained in the air; a condensation determination unit that determines whether or not condensation has occurred in the dust sensor; a dew condensation amount estimating unit that estimates an amount of dew condensation that has occurred in the dust sensor using at least one of a temperature and a humidity of air around the dust sensor when it is determined by the dew condensation determining unit that dew condensation has occurred in the dust sensor; and a dew condensation elimination time determination section that determines a dew condensation elimination time until dew condensation that has occurred in the dust sensor is eliminated based on the dew condensation amount estimated by the dew condensation amount estimation section.
According to this configuration, when it is determined that dew condensation has occurred in the dust sensor, the amount of dew condensation that has occurred in the dust sensor is estimated using at least one of the temperature and the humidity of the air around the dust sensor, and the dew condensation elimination time until dew condensation that has occurred in the dust sensor is eliminated is determined based on the estimated amount of dew condensation.
Note that the parenthesized reference numerals attached to the respective components and the like indicate an example of the correspondence between the components and the like and specific components and the like described in the embodiment described later.
Drawings
Fig. 1 is a block diagram schematically showing the schematic configuration of an air conditioning unit and an air conditioning control device in the first embodiment.
Fig. 2 is an explanatory diagram for briefly explaining a principle of detecting the dust concentration by the dust sensor of fig. 1.
Fig. 3 is a sectional view schematically showing a schematic structure of the dust sensor of fig. 1.
Fig. 4 is a block diagram simply showing an electrical configuration up to the dust sensor of fig. 1 detecting the dust concentration and outputting a signal indicating the dust concentration.
Fig. 5 is a flowchart showing a control process performed by the air conditioner according to the first embodiment.
Fig. 6 is a flowchart showing a control process performed by the air conditioner control device in the first embodiment.
Fig. 7 is a diagram illustrating a waveform of the dust concentration detection value on the abscissa with an elapsed time taken as the axis in order to explain the control processing of fig. 5 in the first embodiment.
Fig. 8 is a diagram illustrating a waveform of the dust concentration detection value when the dust concentration detection value suddenly changes to a side where the temporal change rate of the dust concentration detection value increases, in order to explain the control processing of fig. 5 in the first embodiment.
Fig. 9 is a diagram showing a relationship between the dew condensation elimination time and the dew condensation generation amount.
Fig. 10 is a block diagram schematically showing the schematic configuration of an air conditioning unit and an air conditioning control device in the second embodiment.
Fig. 11 is a flowchart showing a control process performed by the air conditioner control device in the second embodiment.
Fig. 12 is a block diagram schematically showing the schematic configuration of an air conditioning unit and an air conditioning control device in the third embodiment.
Fig. 13 is a flowchart showing a control process performed by the air conditioner control device in the third embodiment.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent portions are denoted by the same reference numerals in the drawings.
(first embodiment)
The dust concentration detection device of the present embodiment will be described with reference to fig. 1 to 9. As shown in fig. 1, the dust concentration detection device includes a dust sensor 32, the dust sensor 32 is disposed in an air conditioning case 21 of an air conditioning unit 2 in an air conditioning device 1 for a vehicle, the air conditioning device 1 for a vehicle is mounted in the vehicle, the dust sensor 32 detects the concentration of dust contained in air flowing through an air passage 24, and the air passage 24 is formed by the air conditioning case 21.
The vehicle air conditioner 1 includes an air conditioning unit 2 and an air conditioning control device 40. The air conditioning unit 2 is a vehicular air conditioning unit that is installed in a vehicle interior and that performs air conditioning in the vehicle interior. For example, the air conditioning unit 2 is provided in an instrument panel disposed on the front side of the vehicle in the vehicle compartment. Note that arrows DR1 and DR2 in fig. 1 indicate the direction of the vehicle on which the air conditioning unit 2 is mounted. That is, arrow DR1 in fig. 1 shows a vehicle front-rear direction DR1, and arrow DR2 shows a vehicle up-down direction DR2. These directions DR1 and DR2 are directions intersecting each other, and strictly speaking, directions orthogonal to each other.
As shown in fig. 1, the air conditioning unit 2 has an air conditioning casing 21, an inside-outside air switching door 22, a blower 23, an evaporator 26, a heater core 27, an air mix door 28, an air filter 30, blowout opening doors 254, 255, 256, and the like.
The air conditioning case 21 is formed of a resin having a certain degree of elasticity and excellent in strength. As a resin forming the air conditioning casing 21, for example, polypropylene can be cited. The air conditioning casing 21 forms an outer shell of the air conditioning unit 2, and an air passage 24, which is an air passage through which air blown into the vehicle interior flows, is formed inside the air conditioning casing 21. The air conditioning case 21 includes an internal air inlet port 241 and an external air inlet port 242 on the upstream side of the air passage 24 in the air flow direction, the internal air inlet port 241 being for introducing internal air from a predetermined portion in the vehicle interior into the air passage 24, and the external air inlet port 242 being for introducing external air from the outside of the vehicle into the air passage 24. Here, the internal air refers to air inside the vehicle cabin, and the external air refers to air outside the vehicle cabin.
The air conditioning casing 21 further includes a plurality of outlet openings 251, 252, and 253 on the downstream side in the air flow direction of the air passage 24, and the plurality of outlet openings 251, 252, and 253 are used to blow air from the air passage 24 to the front seat area in the vehicle interior. The plurality of outlet openings 251, 252, and 253 include a face outlet opening 251, a foot outlet opening 252, and a defroster outlet opening 253.
The face outlet opening 251 blows out the air-conditioned air toward the upper body of the occupant seated in the front seat. The foot outlet openings 252 discharge the air-conditioned air toward the feet of the occupant. The defroster air outlet 253 blows out the air-conditioned air toward the front window of the vehicle.
Inside the air conditioning casing 21, an inside/outside air switching door 22, a blower 23, an evaporator 26, a heater core 27, an air mix door 28, and the like are provided.
The internal/external air switching door 22 continuously adjusts the opening area of the internal air introduction port 241 and the opening area of the external air introduction port 242. The inside/outside air switching door 22 is driven by an actuator such as a servo motor not shown. The inside/outside air switching door 22 is rotated so that one of the inside air introduction port 241 and the outside air introduction port 242 is opened while the other is closed. Thus, the inside/outside air switching door 22 can adjust the ratio of the volume of the inside air to the volume of the outside air introduced into the ventilation passage 24.
As the intake mode to the ventilation path, there are an inside air mode in which the inside air in the vehicle interior is introduced and an outside air mode in which the outside air in the vehicle exterior is introduced. For example, in the internal air mode in which the internal air is exclusively introduced into the ventilation passage 24, the internal/external air switching door 22 is positioned at an operation position at which the internal air introduction port 241 is opened and the external air introduction port 242 is closed. In contrast, in the outside air mode in which the outside air is exclusively introduced into the ventilation passage 24, the inside/outside air switching door 22 is positioned at an operation position in which the inside air introduction port 241 is closed and the outside air introduction port 242 is opened.
The blower 23 is a centrifugal blower for blowing air, and includes: a centrifugal fan 231 disposed in the ventilation passage 24; and a motor, not shown, for driving the centrifugal fan 231 to rotate. When the centrifugal fan 231 that drives the blower 23 rotates, an air flow is formed in the ventilation passage 24. Thus, the air introduced into the air passage 24 from the internal air introduction port 241 or the external air introduction port 242 flows through the air passage 24, and is blown out from at least one of the face outlet openings 251, the foot outlet openings 252, and the defroster outlet openings 253. Further, on the downstream side in the air flow direction of the centrifugal fan 231 in the air passage 24, the air flows substantially in the direction indicated by the arrow Ar.
The face blowout opening door 254 is provided to the face blowout opening portion 251, and adjusts the opening area of the face blowout opening portion 251. The foot outlet opening door 255 is provided in the foot outlet opening 252, and adjusts the opening area of the foot outlet opening 252. The defroster blowout opening door 256 is provided in the defroster blowout opening 253, and adjusts the opening area of the defroster blowout opening 253.
The evaporator 26 is a heat exchanger for cooling air flowing through the ventilation passage 24. The air passing through the evaporator 26 is heat-exchanged with the refrigerant, so that the evaporator 26 cools the air and evaporates the refrigerant.
The heater core 27 is a heat exchanger for heating air flowing through the ventilation passage 24. The heater core 27 exchanges heat between the engine coolant and the air passing through the heater core 27, for example, and heats the air by the heat of the engine coolant. The heater core 27 is disposed on the downstream side in the air flow direction with respect to the evaporator 26.
An air mix door 28 is provided between the evaporator 26 and the heater core 27 of the air conditioning unit 2. The air mix door 28 adjusts the ratio of the volume of air flowing through the evaporator 26 and bypassing the heater core 27 to the volume of air passing through the heater core 27 after passing through the evaporator 26.
The air filter 30 is disposed between the blower 23 and the evaporator 26 in the ventilation path 24 of the air conditioning casing 21. In other words, the air filter 30 is disposed on the downstream side in the air flow direction with respect to the blower 23 and on the upstream side in the air flow direction with respect to the evaporator 26.
The air filter 30 captures dust and the like contained in the air passing through the air filter 30 to some extent. Therefore, the air blown from the blower 23 passes through the air filter 30 to remove dust and the like in the air to some extent, and then flows into the evaporator 26.
Since the air filter 30 is provided in the ventilation path 24 of the air conditioning casing 21, the air conditioning control device 40 can operate the air conditioning unit 2 to reduce the dust concentration in the vehicle interior. In the case of operating in this manner, the air conditioning control device 40 operates the blower 23 after setting the air conditioning unit 2 to the internal air mode, for example. The larger the air volume of the blower 23 is, the higher the dust removal capability of the air conditioning unit 2 for removing dust in the vehicle interior becomes.
Next, the dust sensor 32 will be explained. The dust sensor 32 is disposed in the air-conditioning case 21 in which the air passage 24 is formed, the air passage 24 is configured to allow air blown into the vehicle interior to flow therethrough, and the dust sensor 32 detects the concentration of dust contained in the air flowing through the air passage 24. As shown in fig. 2 and 3, the dust sensor 32 detects the dust concentration, and outputs a detection signal indicating the detected dust concentration to the air conditioning control device 40, the dust concentration being the concentration of floating particles contained in the air at the predetermined sensing location Are. This dust concentration is also called dust concentration, and more specifically, is the mass concentration of dust contained in the air, and the unit of the dust concentration is, for example, "μ g/m 3 ”。
The dust sensor 32 of the present embodiment is an optical dust sensor configured to detect the dust concentration by a light scattering method. That is, the dust sensor 32 includes: a light emitting section 321 that emits light; a light receiving unit 322 that receives the light emitted from the light emitting unit 321; and a sensor case 323 that houses the light emitting section 321 and the light receiving section 322. The dust sensor 32 receives the reflected light reflected from the light emitted from the light emitting unit 321 by the light receiving unit 322, and detects the dust concentration contained in the air flowing through the air passage 24.
Therefore, a part of the air flowing through the ventilation path 24 of the air-conditioning case 21 is introduced into the sensor case 323 of the dust sensor 32. Specifically, the dust sensor 32 is disposed on the downstream side in the air flow direction of the centrifugal fan 231 relative to the blower 23 and on the upstream side in the air flow direction of the air filter 30. Therefore, air is introduced into sensor case 323 from between centrifugal fan 231 and air filter 30 in ventilation passage 24. That is, in the present embodiment, a space between the centrifugal fan 231 and the air filter 30 in the air passage 24 serves as a sensing portion of the dust sensor 32.
The light emitting portion 321 of the dust sensor 32 includes: a light emitting element 321a formed of, for example, a light emitting diode; and an irradiation light lens 321b. The light receiving portion 322 includes: a light receiving element 322a formed of, for example, a photodiode; and a collection lens 322b. Light emitted from the light emitting element 321a and passing through the irradiation light lens 321B as indicated by arrow B1 in fig. 3 is reflected by dust in the air introduced into the sensor housing 323, and the reflected light is received by the light receiving element 322a through the light collecting lens 322B as indicated by arrow B2. A current based on the amount of received light flows to the light receiving element 322 a.
As shown in fig. 4, the dust sensor 32 includes a sensor circuit 324, and the sensor circuit 324 amplifies a current of the light receiving element 322a, converts the amplified current into a voltage, amplifies the voltage, and outputs the voltage. The voltage output of the dust sensor 32 is converted to a dust concentration. The dust sensor 32 detects the dust concentration of the ventilation path 24 in this manner. In addition, the vertical axis of the graph GF in fig. 4 indicates the dust concentration converted from the voltage value, that is, the concentration converted value, and the horizontal axis of the graph GF indicates the elapsed time.
In a state where the optical components of the dust sensor 32, such as the light emitting portion 321, the irradiation light lens 321b, the condenser lens 322b, and the light receiving element 322a, are cooled, when air having a high temperature and a high humidity is introduced to the periphery of the dust sensor 32, dew condensation occurs in each optical component of the dust sensor 32. As described above, when dew condensation occurs in each optical component of the dust sensor 32, the voltage output of the dust sensor 32 varies greatly.
As shown in fig. 3, the dust sensor 32 of the present embodiment includes a thermistor 325, and the thermistor 325 detects the temperature in the sensor case 323. The thermistor 325 detects the temperature of the dust sensor 32, and outputs the detected temperature to the dust sensor control section 50 as a temperature signal of the dust sensor 32.
Next, the air-conditioning control device 40 will be explained. The air-conditioning control device 40 shown in fig. 1 is a control device that controls the air-conditioning unit 2. Specifically, the air conditioning control device 40 is an electronic control device including a storage unit made of a nonvolatile physical storage medium such as a semiconductor memory and a processor. The air conditioning control device 40 runs the computer program stored in the storage unit. By executing the computer program, a method corresponding to the computer program is executed. That is, the air conditioning control device 40 executes various control processes such as the processes of fig. 5 to 6 described later on the basis of the computer program.
The air conditioning control device 40 outputs a control signal to each actuator included in the air conditioning unit 2 to control the operation of each actuator. In short, the air conditioning control device 40 performs various air conditioning controls in the air conditioning unit 2. For example, the above-described blower 23, inside/outside air switching door 22, air mix door 28, face blowout opening door 254, foot blowout opening door 255, and defroster blowout opening door 256 are drive-controlled by the air conditioning control device 40.
As shown in fig. 1, the air conditioning control device 40 is electrically connected to an operation device 44, a display device 46, and a communication unit 47, in addition to sensors such as the dust sensor 32 and actuators such as a door.
The operation device 44 is an operation unit that is operated by the occupant when adjusting the air volume, temperature, and the like of the conditioned air blown out from the air conditioning unit 2. The operation device 44 is disposed on an instrument panel of the vehicle, for example. In operation device 44, for example, the air volume of the air-conditioned air, the target room temperature in the vehicle interior, the air outlet of the air-conditioned air, and the like can be set. Further, the operation device 44 can set an automatic air-conditioning mode in which the air volume of the air-conditioned air, the temperature of the air-conditioned air, and the selection of the internal air circulation or the external air introduction are automatically performed. Operation device 44 outputs, to air conditioning control device 40, information indicating the settings, that is, operation information indicating the operation performed by the occupant on operation device 44.
For example, when the automatic air-conditioning mode is set by the operation device 44, the air-conditioning control device 40 automatically adjusts or controls the air volume of the blower 23 and the operation of each door 22, 28, 254, 255, 256 based on input signals from a plurality of sensors.
The display device 46 is a display unit that displays various information of the air conditioning unit 2. That is, signals indicating various information of the air conditioning unit 2 are input from the air conditioning control device 40 to the display device 46, and the display device 46 performs display in accordance with the input signals from the air conditioning control device 40.
The display device 46 is disposed at a position easily visible to an occupant in the vehicle interior, such as an instrument panel of the vehicle. The display device 46 may be included in a display device of another in-vehicle device such as a car navigation device, or may be configured as a device dedicated to the air conditioning unit 2.
The communication unit 47 communicates with external devices such as various ECUs. The air conditioning control device 40 including the dust sensor control unit 50 notifies information such as a detection value of the dust concentration detected by the dust sensor 32 to various external devices such as ECUs via the communication unit 47.
Signals indicating the outside air temperature, the outside air humidity, the inside air temperature, and the inside air humidity, and a door opening/closing signal are input to the air conditioning control device 40. The outside air temperature is detected by an outside air temperature sensor that detects the temperature outside the vehicle, and the outside air humidity is detected by an outside air humidity sensor that detects the relative humidity outside the vehicle. The internal air temperature is detected by an internal air temperature sensor that detects the temperature in the vehicle interior, and the internal air humidity is detected by an internal air humidity sensor that detects the relative humidity in the vehicle interior. The door opening/closing signal is a signal indicating that there is opening/closing of the door opening of the vehicle by the door of the vehicle, and is input from a door opening switch not shown.
Next, the processing executed by the air-conditioning control device 40 and the dust sensor control unit 50 will be described with reference to fig. 5 to 6. Fig. 5 to 6 are flowcharts showing processes executed by the air conditioning control device 40 and the dust sensor control unit 50. Here, the control process will be described with the air conditioning control device 40 and the dust sensor control unit 50 as control units. The control unit periodically executes the flowcharts of fig. 5 to 6, for example, during the operation of the air conditioning unit 2.
First, in step S10, the control unit obtains the outside air temperature detected by the outside air temperature sensor, and in step S20, the control unit obtains the outside air humidity detected by the outside air humidity sensor.
Next, in step S30, the control unit obtains the internal air temperature detected by the internal air temperature sensor, and in step S40, the control unit obtains the internal air humidity detected by the internal air humidity sensor.
Next, in step S50, the control section acquires a detection value Dm of the dust concentration detected by the dust sensor 32, that is, a dust concentration detection value Dm, based on the detection signal from the dust sensor 32. In short, the control section performs detection of the dust concentration based on the detection signal from the dust sensor 32.
Next, in step S60, the control unit determines whether or not the dew condensation flag is set. Specifically, it is determined whether or not a dew condensation flag indicating that dew condensation has occurred in the dust sensor 32 is set in the storage unit. The dew condensation flag is a flag set by the control unit itself.
Here, an example will be described in which condensation does not occur in the dust sensor 32 and the condensation flag is not set in the storage unit. When the dew condensation flag is not provided in the storage unit, the control unit determines whether or not a door open/close signal is input from a door open switch, not shown, in step S70.
In addition, when the door of the vehicle opens and closes the door opening portion in a state where the air in the vehicle interior is cooled by cooling, and high-temperature and high-humidity outside air outside the vehicle enters the vehicle interior from the door opening portion of the vehicle, the high-temperature and high-humidity outside air outside the vehicle interior may be sucked into the ventilation path 24, and dew condensation may occur in the dust sensor 32. In order to grasp such a situation, the control unit determines whether the vehicle door is opened or closed based on whether the door opening/closing signal is input from the door opening switch in step S70.
When the door open/close signal is input from the door open switch, the control unit determines whether or not dew condensation has occurred in the dust sensor 32 in step S80. For example, as shown in fig. 7 and 8, when the time rate of change of the dust concentration detection value Dm, that is, the inclination of the dust concentration detection value Dm exceeds a predetermined limit and suddenly changes, it is determined that condensation has occurred in the dust sensor 32. This is because, when dew condensation occurs in the dust sensor 32, light emitted from the light emitting section 321 is also reflected by the dew condensation water in the sensor case 323. That is, in step S80, it is determined whether or not the dust concentration detection value Dm is affected by the dew condensation of the dust sensor 32, and if the dust concentration detection value Dm is affected by the dew condensation, it is determined that the dew condensation has occurred in the dust sensor 32.
When it is determined that dew condensation has occurred in the dust sensor 32, the control unit determines the absolute humidity of the outside air outside the vehicle compartment in step S90. The absolute humidity of the outside air outside the vehicle compartment can be determined using the outside air temperature acquired in step S10 and the outside air humidity acquired in S20.
Next, in step S100, the control unit determines the saturated water vapor amount in the vehicle interior. Specifically, the control unit determines the saturated steam amount corresponding to the internal gas temperature acquired in step S30 as the saturated steam amount in the vehicle interior. The unit of the saturated water vapor amount is, for example, g/m 3 。
Next, in step S110, the control unit estimates the dew condensation amount of the dust sensor 32 based on the absolute humidity of the outside air outside the vehicle compartment determined in step S90 and the saturated water vapor amount inside the vehicle compartment determined in step S100. The dew condensation amount of the dust sensor 32 can be calculated as the absolute humidity of the volume outside air outside the vehicle compartment — the saturated water vapor amount inside the vehicle compartment. Further, the absolute humidity of the volume outside the vehicle compartment is the absolute humidity per unit volume expressed in g/m 3 。
Next, in step S120, the control portion determines the air volume of the air around the dust sensor 32. In the present embodiment, whether the air volume of the air around the dust sensor 32 is large or small is determined based on whether the voltage value at which the centrifugal fan 231 that drives the blower 23 rotates is equal to or greater than the predetermined voltage.
Next, in step S130, the control portion determines the dew condensation eliminating time of the dust sensor 32. Fig. 9 shows the relationship between the dew condensation elimination time and the amount of dew condensation generated. As shown in the figure, the larger the amount of dew condensation occurs, the longer the dew condensation elimination time. In addition, the dew condensation elimination time is shorter when the wind speed of the air around the dust sensor 32 is the predetermined speed v, as compared with the case where the wind speed of the air around the dust sensor 32 is 0. That is, when the air volume around the dust sensor 32 is large, the dew condensation elimination time becomes shorter than when the air velocity around the dust sensor 32 is small.
The relationship between the dew condensation elimination time and the dew condensation generation amount shown in fig. 9 is stored as a map in the storage unit of the control unit, and the control unit refers to the map and determines the dew condensation elimination time of the dust sensor 32 from the dew condensation amount of the dust sensor 32 determined in step S110 and the air volume of the air around the dust sensor 32 determined in step S120.
Next, in step S140, the control unit outputs a dew condensation diagnosis indicating that dew condensation is occurring in the dust sensor 32 to the vehicle body ECU as an external device via the communication unit 47, and proceeds to A1 of fig. 6.
Further, when receiving the dew condensation diagnosis from the control portion via the communication portion 47, the body ECU causes the display device 46 to display information that dew condensation has occurred in the dust sensor 32.
Next, in step S150, the control unit determines whether or not the dew condensation elimination time has elapsed. When it is determined in step S80 that dew condensation has occurred in the dust sensor 32, the control unit starts counting by a timer, and determines whether the dew condensation elimination time has elapsed based on the count value of the timer.
If the dew condensation elimination time does not elapse, the control unit sets or sets the dew condensation maintaining flag in step S180. That is, the dew condensation flag is set in the storage unit when the dew condensation flag is not set in the storage unit, and the setting of the dew condensation flag in the storage unit is maintained when the dew condensation flag is set in the storage unit.
Next, in step S190, the control unit corrects the output value of the dust concentration acquired in step S50. The control unit of the present embodiment periodically stores in the storage unit the output value of the dust sensor 32 when condensation does not occur in the dust sensor 32. Since the accuracy of the output value of the dust sensor 32 when dew condensation occurs in the dust sensor 32 is low, the output value of the dust sensor 32 closest to the time when dew condensation does not occur in the dust sensor 32 is read from the storage unit, and the output value of the dust sensor 32 read from the storage unit is corrected to the output value of the dust sensor 32.
Next, in step S200, the control section outputs the dust concentration from the communication section 47. Here, the communication unit 47 outputs the output value of the dust sensor 32 corrected in step S190, and the process is ended.
When the dew condensation elimination time elapses from the time when it is determined in step S80 that dew condensation has occurred on the dust sensor 32 and it is determined in step S150 that the dew condensation elimination time elapses, the control unit releases the dew condensation flag in step S160. Specifically, the control unit erases the dew condensation flag stored in the storage unit.
Next, in step S170, the control unit cancels the dew condensation diagnosis indicating that dew condensation is occurring in the dust sensor 32. This processing is performed by the dust sensor control unit 50 on the air-conditioning control device 40. Specifically, the dust sensor control unit 50 stops the output of the dew condensation diagnosis to the external device via the communication unit 47.
If it is determined in step S60 that the dew condensation flag is set, the control unit proceeds to step S140 without executing steps S70 to S130. Therefore, the control unit continues to output the dew condensation diagnosis.
When the door open/close signal is not input from the door open switch in step S70, the control unit proceeds to step S200. Therefore, in S200, the control unit outputs the output value of the dust concentration acquired in step S50 from the communication unit 47.
Here, although not shown, when the intake mode is the external air mode and the output value of the dust concentration is equal to or greater than a predetermined value, the control unit performs a process of switching the intake mode to the internal air mode and increases the voltage value for rotating the centrifugal fan 231 that drives the blower 23 so that the flow rate of the air that passes through the air filter 30 increases.
If it is determined in step S80 that condensation has not occurred on the dust sensor 32, the control unit proceeds to step S200. In this case, in S200, the control unit also outputs the output value of the dust concentration acquired in step S50 from the communication unit 47.
As described above, the dust concentration detection device includes the dust sensor 32, the dust sensor 32 includes the light emitting unit 321 that emits light and the light receiving unit 322 that receives light, and the dust sensor 32 detects the concentration of dust contained in air by the light receiving unit 322 receiving reflected light obtained by reflecting the light emitted from the light emitting unit 321 by the dust contained in the air. Further, the dew condensation determinator and a dew condensation amount estimator are provided, the dew condensation determinator determining whether or not dew condensation has occurred in the dust sensor 32, and the dew condensation amount estimator estimating the amount of dew condensation that has occurred in the dust sensor using at least one of the temperature and the humidity of air around the dust sensor when the dew condensation determinator determines that dew condensation has occurred in the dust sensor. Further, a dew condensation elimination time determination unit is provided which determines a dew condensation elimination time until dew condensation generated in the dust sensor is eliminated based on the dew condensation amount estimated by the dew condensation amount estimation unit.
According to such a configuration, when it is determined that dew condensation has occurred in the dust sensor 32, the amount of dew condensation that has occurred in the dust sensor is estimated using at least one of the temperature and the humidity of the air around the dust sensor 32, and the dew condensation elimination time until dew condensation that has occurred in the dust sensor 32 is eliminated is determined based on the amount of dew condensation, so it is possible to accurately determine that dew condensation of the dust sensor 32 has been eliminated when dew condensation of the dust sensor 32 is eliminated.
Further, it is also possible to determine whether or not the dew condensation of the dust sensor 32 has been eliminated based on whether or not the level of the output voltage of the dust sensor 32 has stabilized. However, since the level of the output voltage of the dust sensor 32 becomes gradually stable in the process of eliminating the dew condensation that has occurred in the dust sensor 32, it is difficult to accurately determine whether the dew condensation of the dust sensor 32 has been eliminated in such a configuration that determines whether the dew condensation of the dust sensor 32 has been eliminated based on the level of the output voltage of the dust sensor 32. For example, the following is conceivable: although the dew condensation of the dust sensor 32 is not completely eliminated, it is erroneously determined that the dew condensation of the dust sensor 32 has been eliminated.
However, by estimating the amount of dew condensation that has occurred in the dust sensor as in the present embodiment, and determining the dew condensation elimination time until the dew condensation that has occurred in the dust sensor 32 is eliminated based on the estimated amount of dew condensation, it is possible to accurately determine that the dew condensation on the dust sensor 32 has been eliminated when the dew condensation on the dust sensor 32 is eliminated.
The dust concentration detection device further includes an air speed estimation unit that estimates an air speed of air around the dust sensor 32, and the dew condensation elimination time determination unit determines the dew condensation elimination time based on the air speed of air around the dust sensor estimated by the air speed estimation unit and the dew condensation amount estimated by the dew condensation amount estimation unit.
Therefore, it is possible to determine the dew condensation elimination time in consideration of the influence of the wind speed of the air around the dust sensor.
The dust sensor 32 is disposed in the air-conditioning case 21, the air-conditioning case 21 is provided with an air passage 24 through which air blown into the vehicle interior flows, and the dust sensor 32 detects the concentration of dust contained in the air flowing through the air passage.
In this way, the dust sensor 32 is disposed in the air-conditioning case 21 in which the air passage 24 through which the air blown into the vehicle interior flows is formed, and the dust sensor 32 can detect the concentration of dust contained in the air flowing through the air passage 24.
The dust concentration detection device further includes a door opening/closing determination unit that determines whether or not there is opening/closing of the door opening of the vehicle by the door of the vehicle, and the dew condensation determination unit determines whether or not dew condensation has occurred in the dust sensor when the door opening/closing determination unit determines that there is opening/closing of the door opening of the vehicle.
Therefore, for example, in a situation where the door opening is opened and closed by the door of the vehicle in a state where the air in the vehicle interior is cooled by cooling, and there is a possibility that the high-temperature and high-humidity outside air outside the vehicle interior enters the vehicle interior from the door opening of the vehicle and dew condensation occurs in the dust sensor 32, the dew condensation elimination time until dew condensation that has occurred in the dust sensor 32 is eliminated can be determined.
In addition, the dust concentration detection device is provided with: an outside air absolute temperature determination portion (S90) that determines an absolute temperature outside a vehicle; and a saturated water vapor amount determination unit (S100) that determines the saturated water vapor amount in the interior of the vehicle. The dew condensation amount estimating unit estimates the amount of dew condensation that has occurred in the dust sensor, based on the absolute temperature of the outside of the vehicle determined by the outside air absolute temperature determining unit and the saturated water vapor amount of the inside of the vehicle determined by the saturated water vapor amount determining unit.
In this way, the absolute temperature outside the vehicle and the saturated water vapor amount inside the vehicle are determined, and the amount of dew condensation that has occurred in the dust sensor is estimated based on the absolute temperature outside the vehicle and the saturated water vapor amount inside the vehicle, whereby the dew condensation elimination time can be determined with high accuracy.
(second embodiment)
A dust concentration detection device according to a second embodiment will be described with reference to fig. 10 to 11. The outside air temperature, the outside air humidity, the inside air temperature, the inside air humidity, and the door opening/closing signal are input to the air conditioning control device 40 of the first embodiment, but as shown in fig. 10, the inside air temperature and the inside air humidity are input to the air conditioning control device 40 of the present embodiment.
Fig. 11 and 6 are flowcharts illustrating processing executed by the air conditioning control device 40 and the dust sensor control unit 50 according to the present embodiment. Note that portions related to fig. 6 are the same as the control processing of the first embodiment, and therefore description thereof will be omitted here, and the description will be given centering on the portions shown in fig. 11.
As shown in fig. 11, first, in step S12, the control unit obtains the temperature of the dust sensor 32 detected by the thermistor 325.
Next, in step S30, the control unit obtains the internal air temperature detected by the internal air temperature sensor, and in step S40, the control unit obtains the internal air humidity detected by the internal air humidity sensor.
Next, in step S50, the control unit obtains a dust concentration detection value Dm, which is a detection value Dm of the dust concentration detected by the dust sensor 32, based on the detection signal from the dust sensor 32, and in step S60, the control unit determines whether or not the dew condensation flag is set.
Here, an example will be described in which condensation does not occur in the dust sensor 32 and the condensation flag is not set in the storage unit. If the dew condensation flag is not set in the storage unit, the control unit determines whether the intake mode is the internal air mode in step S62. Specifically, the control unit determines whether the intake mode is the internal air mode or the external air mode.
Here, when the intake mode is set to the internal air mode, the control unit determines whether or not dew condensation has occurred in the dust sensor 32 in step S80.
When it is determined that dew condensation has occurred in the dust sensor 32, the control unit determines the absolute humidity of the internal air in the vehicle interior in step S92. The absolute humidity of the interior air in the vehicle interior can be determined using the temperature of the interior air obtained in step S20 and the humidity of the interior air obtained in step S30.
Next, in step S94, the control portion determines the saturated water vapor amount of the dust sensor 32. Specifically, the control unit determines the saturated water vapor amount corresponding to the temperature of the dust sensor 32 acquired in step S10 as the saturated water vapor amount of the dust sensor 32.
Next, in step S110, the control unit estimates the amount of condensation of the dust sensor 32 based on the absolute humidity of the internal air in the vehicle interior determined in step S92 and the saturated water vapor amount of the dust sensor 32 determined in step S94. The dew condensation amount of the dust sensor 32 can be calculated as the absolute humidity of the gas inside the volume inside the vehicle compartment — the saturated water vapor amount of the dust sensor 32. Further, the absolute humidity of the gas inside the volume outside the vehicle compartment is the absolute humidity per unit volume expressed in g/m 3 。
Next, in step S120, the control portion determines the air volume of the air around the dust sensor 32. Specifically, the control unit determines whether the air volume of the air around the dust sensor 32 is large or small.
Next, in step S130, the control portion determines the dew condensation elimination time of the dust sensor 32. The relationship between the dew condensation elimination time and the dew condensation generating amount shown in fig. 9 is stored as a map in the storage unit of the control unit, and the control unit refers to the map and determines the dew condensation elimination time of the dust sensor 32 from the dew condensation amount of the dust sensor 32 determined in step S110 and the air volume of the air around the dust sensor 32 determined in step S120. Further, the control unit determines the dew condensation elimination time of the dust sensor 32 so as to correspond to the air volume of the air around the dust sensor 32 determined in step S120, and proceeds to step S140.
As described above, the dust concentration detection device includes the internal air mode determination unit that determines whether or not the intake mode of the ventilation passage 24 is the internal air mode of the internal air introduced into the vehicle interior. When the mode determination unit determines that the intake mode is the internal air mode, the dew condensation determination unit determines whether or not dew condensation has occurred in the dust sensor 32.
In this way, when it is determined that the intake mode is the internal air mode, it is possible to determine whether or not dew condensation has occurred in the dust sensor 32.
In addition, the dust concentration detection device is provided with: a sensor temperature determination portion that determines the temperature of the dust sensor 32; an interior gas temperature determination unit that determines a temperature in a room of a vehicle; and an indoor humidity determination portion that determines humidity in the room of the vehicle. When the mode determination unit determines that the intake mode is the internal air mode, the dew condensation amount estimation unit determines the absolute humidity in the vehicle interior based on the temperature in the vehicle interior determined by the internal air temperature determination unit and the humidity in the vehicle interior determined by the indoor humidity determination unit, determines the saturated water vapor amount of the dust sensor based on the temperature of the dust sensor determined by the sensor temperature determination unit, and estimates the amount of dew condensation that has occurred in the dust sensor based on the absolute humidity in the vehicle interior and the saturated water vapor amount of the dust sensor.
As described above, when it is determined that the intake mode is the internal air mode, the absolute humidity in the vehicle interior is determined based on the temperature in the vehicle interior and the humidity in the vehicle interior, the saturated water vapor amount of the dust sensor is determined based on the temperature of the dust sensor determined by the sensor temperature determination unit, and the dew condensation amount occurring in the dust sensor is estimated based on the absolute humidity in the vehicle interior and the saturated water vapor amount of the dust sensor, so that the dew condensation elimination time can be determined with high accuracy.
(third embodiment)
A dust concentration detection device according to a third embodiment will be described with reference to fig. 12 to 13. The outside air temperature, the outside air humidity, the inside air temperature, the inside air humidity, and the door opening/closing signal are input to the air conditioning control device 40 of the first embodiment, but as shown in fig. 12, the outside air temperature and the outside air humidity are input to the air conditioning control device 40 of the present embodiment.
Fig. 13 and 6 are flowcharts illustrating processing executed by the air conditioning control device 40 and the dust sensor control unit 50 according to the present embodiment. Note that portions related to fig. 6 are the same as the control processing of the first embodiment, and therefore, description thereof will be omitted here, and the portions shown in fig. 13 will be mainly described here.
As shown in fig. 13, first, in step S12, the control unit obtains the temperature of the dust sensor 32 detected by the thermistor 325.
Next, in step S10, the control unit obtains the outside air temperature detected by the outside air temperature sensor, and in step S20, the control unit obtains the outside air humidity detected by the outside air humidity sensor.
Next, in step S50, the control unit obtains a detection value Dm of the dust concentration detected by the dust sensor 32, that is, a dust concentration detection value Dm, based on the detection signal from the dust sensor 32, and in step S60, the control unit determines whether or not the dew condensation flag is set.
Here, an example will be described in which condensation does not occur in the dust sensor 32 and the condensation flag is not set in the storage unit. If the dew condensation flag is not set in the storage unit, the control unit determines whether the intake mode is the external air mode in step S63. Specifically, the control unit determines whether the intake mode is the internal air mode or the external air mode.
Here, when the intake mode is set to the external air mode, the control unit determines whether or not dew condensation has occurred in the dust sensor 32 in step S80.
When it is determined that dew condensation has occurred in the dust sensor 32, the control unit determines the absolute humidity of the outside air outside the vehicle compartment in step S93. The absolute humidity of the outside air outside the vehicle compartment can be determined using the outside air temperature obtained in step S10 and the outside air humidity obtained in step S20.
Next, in step S94, the control portion determines the saturated water vapor amount of the dust sensor 32. Specifically, the control unit determines the saturated water vapor amount corresponding to the temperature of the dust sensor 32 acquired in step S10 as the saturated water vapor amount of the dust sensor 32.
Next, in the stepIn step S110, the control unit estimates the amount of condensation on the dust sensor 32 based on the absolute humidity of the outside air outside the vehicle compartment determined in step S93 and the saturated water vapor amount of the dust sensor 32 determined in step S94. The dew condensation amount of the dust sensor 32 can be calculated as the volumetric outside air absolute humidity outside the vehicle compartment — the saturated water vapor amount of the dust sensor 32. Further, the absolute humidity of the volume outside the vehicle compartment is the absolute humidity per unit volume expressed in g/m 3 。
Next, in step S120, the control portion determines the air volume of the air around the dust sensor 32. Specifically, the control section determines whether the air volume of the air around the dust sensor 32 is large or small.
Next, in step S130, the control portion determines the dew condensation elimination time of the dust sensor 32. The relationship between the dew condensation elimination time and the dew condensation generation amount shown in fig. 9 is stored as a map in the storage unit of the control unit, and the control unit refers to the map to determine the dew condensation elimination time of the dust sensor 32 based on the dew condensation amount of the dust sensor 32 determined in step S110 and the air volume of the air around the dust sensor 32 determined in step S120. Further, the control unit determines the dew condensation elimination time of the dust sensor 32 so as to correspond to the air volume of the air around the dust sensor 32 determined in step S120, and proceeds to step S140.
As described above, the dust concentration detection device includes the external air mode determination unit (S63) that determines whether or not the intake mode of the ventilation path is the external air mode of the external air to be introduced to the outside of the vehicle, and the dew condensation determination unit determines whether or not dew condensation has occurred in the dust sensor when the intake mode is determined to be the external air mode by the mode determination unit.
In this way, when it is determined that the intake mode is the external air mode, it is possible to determine whether or not dew condensation has occurred in the dust sensor.
In addition, the dust concentration detection device includes: a sensor temperature determination portion that determines the temperature of the dust sensor 32; an outside air temperature determination unit that determines a temperature outside of the vehicle; and an outdoor humidity determination portion that determines a humidity outside the vehicle. When the mode determination unit determines that the intake mode is the outside air mode, the dew condensation amount estimation unit determines the absolute humidity outside the vehicle room based on the temperature outside the vehicle room determined by the outside air temperature determination unit and the humidity outside the vehicle room determined by the outside humidity determination unit, determines the saturated water amount of the dust sensor based on the temperature of the dust sensor determined by the sensor temperature determination unit, and estimates the amount of dew condensation that has occurred in the dust sensor based on the absolute humidity outside the vehicle room and the saturated water vapor amount of the dust sensor.
As described above, when it is determined that the air intake mode is the outside air mode, the absolute humidity outside the vehicle room is determined based on the temperature outside the vehicle room and the humidity outside the vehicle room, the saturated water vapor amount of the dust sensor is determined based on the temperature of the dust sensor determined by the sensor temperature determination unit, and the dew condensation amount occurring in the dust sensor is estimated based on the absolute humidity outside the vehicle room and the saturated water vapor amount of the dust sensor, so that the dew condensation elimination time can be determined with high accuracy.
(other embodiments)
(1) In each of the above embodiments, the outside air temperature is acquired from the outside air temperature sensor, the outside air humidity is acquired from the outside air humidity sensor, the inside air temperature is acquired from the inside air temperature sensor, and the inside air humidity is acquired from the inside air humidity sensor. For example, the respective temperatures and the respective humidities may be acquired via the vehicle LAN. For example, the external air temperature and the external air humidity may be acquired from a cloud server via a wireless communication network.
(2) The voltage value for rotating the centrifugal fan 231 for driving the blower 23 may be varied in multiple stages, and the wind speed of the air blown from the blower 23 may be varied in multiple stages. In this case, the wind speed of the air flowing around the dust sensor 32 may be estimated in multiple stages from the fan voltage, and the dew condensation elimination time may be determined using the estimated wind speed.
(3) In the first embodiment, when the door opening/closing determination unit determines that the opening/closing of the door opening of the vehicle is present in S70, it is determined whether or not the dew condensation is generated in the dust sensor in S80. On the other hand, when it is determined that the opening/closing of the window of the door of the vehicle is present based on the signal indicating whether the opening/closing of the window of the door of the vehicle is present, it may be determined whether or not the dew condensation is present in the dust sensor in S80.
(4) In the second embodiment, the dew condensation elimination time suitable for the internal gas mode is determined when it is determined that the intake mode is the internal gas mode, and in the third embodiment, the dew condensation elimination time suitable for the external gas mode is determined when it is determined that the intake mode is the external gas mode. In contrast, the second embodiment and the third embodiment may be combined. Specifically, it may be determined whether the intake mode is the internal air mode or the external air mode, and the dew condensation elimination time suitable for the internal air mode may be determined when the intake mode is the internal air mode, and the dew condensation elimination time suitable for the external air mode may be determined when the intake mode is the external air mode.
The present invention is not limited to the above-described embodiments, and can be modified as appropriate. The above embodiments are not independent of each other, and can be combined as appropriate except when the combination is obviously impossible. It is needless to say that in each of the above embodiments, elements constituting the embodiments are not necessarily essential except for cases where they are specifically indicated as essential and cases where they are apparently considered essential in principle. In the above embodiments, when numerical values such as the number, numerical value, amount, and range of the constituent elements of the embodiments are mentioned, the number is not limited to a specific number except for a case where the numerical values are specifically and explicitly indicated as essential and a case where the numerical values are obviously limited to a specific number in principle. In the above embodiments, when referring to the material, shape, positional relationship, and the like of the constituent elements and the like, the material, shape, positional relationship, and the like are not limited to those unless otherwise explicitly stated or limited to a specific material, shape, positional relationship, and the like in principle.
(conclusion)
According to a first aspect shown in part or all of the above embodiments, the dust concentration detection device includes a dust sensor that has a light emitting portion that emits light and a light receiving portion that receives light, and that detects a concentration of dust contained in air by the light receiving portion receiving reflected light obtained by reflecting the light emitted from the light emitting portion by the dust contained in the air. Further, the apparatus comprises: a condensation determination unit that determines whether or not condensation has occurred in the dust sensor; and a dew condensation amount estimating unit that estimates an amount of dew condensation that has occurred in the dust sensor using at least one of a temperature and a humidity of air around the dust sensor when it is determined by the dew condensation determining unit that dew condensation has occurred in the dust sensor. Further, a dew condensation elimination time determination unit is provided which determines a dew condensation elimination time until dew condensation generated in the dust sensor is eliminated based on the dew condensation amount estimated by the dew condensation amount estimation unit.
Further, according to a second aspect, the dust concentration detection device includes a wind speed estimation unit that estimates a wind speed of air around the dust sensor, and the dew condensation elimination time determination unit determines the dew condensation elimination time based on the wind speed of the air around the dust sensor estimated by the wind speed estimation unit and the dew condensation amount estimated by the dew condensation amount estimation unit.
Therefore, the dew condensation elimination time can be determined in consideration of the influence of the wind speed of the air around the dust sensor.
In addition, according to a third aspect, the dust sensor is disposed in an air-conditioning case in which an air passage through which air blown into the vehicle interior flows is formed, and detects the concentration of dust contained in the air flowing through the air passage.
In this way, the dust sensor is disposed in the air conditioning case in which the air passage through which the air blown into the vehicle interior flows is formed, and the dust sensor can detect the concentration of dust contained in the air flowing through the air passage 24.
Further, according to a fourth aspect, the dust concentration detection device includes a door opening/closing determination section that determines whether or not there is opening/closing of the door opening of the vehicle by the door of the vehicle, and the dew condensation determination section determines whether or not dew condensation has occurred in the dust sensor when the door opening/closing determination section determines that there is opening/closing of the door opening of the vehicle.
Therefore, when it is determined that there is opening and closing of the door opening of the vehicle, it is possible to determine whether or not dew condensation has occurred in the dust sensor. For example, in a situation where the door of the vehicle opens and closes the door opening portion in a state where the air in the vehicle interior is cooled by cooling, and there is a possibility that the high-temperature and high-humidity outside air outside the vehicle interior enters the vehicle interior from the door opening portion of the vehicle and dew condensation occurs in the dust sensor 32, the dew condensation elimination time until dew condensation that has occurred in the dust sensor is eliminated can be determined.
In addition, according to a fifth aspect, the dust concentration detection apparatus includes: an outside air absolute temperature determination portion that determines an absolute temperature outside of the vehicle; and a saturated steam amount determination unit that determines a saturated steam amount in a room of the vehicle. The dew condensation amount estimating unit estimates the amount of dew condensation that has occurred in the dust sensor, based on the absolute temperature outside the vehicle determined by the outside air absolute temperature determining unit and the saturated water vapor amount inside the vehicle determined by the saturated water vapor amount determining unit.
In this way, the absolute temperature outside the vehicle and the saturated water vapor amount inside the vehicle are determined, and the amount of dew condensation that has occurred in the dust sensor is estimated based on the absolute temperature outside the vehicle and the saturated water vapor amount inside the vehicle, whereby the dew condensation elimination time can be determined with high accuracy.
In addition, according to a sixth aspect, the dust concentration detection device includes an internal air mode determination unit that determines whether or not an intake mode of the ventilation passage is an internal air mode of the internal air introduced into the vehicle interior. When the mode determination unit determines that the intake mode is the internal air mode, the dew condensation determination unit determines whether or not dew condensation has occurred in the dust sensor.
In this way, when it is determined that the intake mode is the internal air mode, it is possible to determine whether or not dew condensation has occurred in the dust sensor.
In addition, according to a seventh aspect, the dust concentration detection apparatus includes: a sensor temperature determination section that determines a temperature of the dust sensor; an interior gas temperature determination unit that determines a temperature in a room of a vehicle; and an indoor humidity determination portion that determines humidity in the room of the vehicle. When the mode determination unit determines that the intake mode is the internal air mode, the dew condensation amount estimation unit determines the absolute humidity in the vehicle interior based on the temperature in the vehicle interior determined by the internal air temperature determination unit and the humidity in the vehicle interior determined by the indoor humidity determination unit, determines the saturated water vapor amount of the dust sensor based on the temperature of the dust sensor determined by the sensor temperature determination unit, and estimates the amount of dew condensation that has occurred in the dust sensor based on the absolute humidity in the vehicle interior and the saturated water vapor amount of the dust sensor.
As described above, when it is determined that the intake mode is the internal air mode, the absolute humidity in the vehicle interior is determined based on the temperature in the vehicle interior and the humidity in the vehicle interior, the saturated water vapor amount of the dust sensor is determined based on the temperature of the dust sensor determined by the sensor temperature determination unit, and the dew condensation amount occurring in the dust sensor is estimated based on the absolute humidity in the vehicle interior and the saturated water vapor amount of the dust sensor, so that the dew condensation elimination time can be determined with high accuracy.
In addition, according to an eighth aspect, the dust concentration detection device includes an external air mode determination unit that determines whether or not an intake mode of the ventilation passage is an external air mode in which external air is introduced to the outside of the vehicle. When the mode determination unit determines that the intake mode is the external air mode, the dew condensation determination unit determines whether or not dew condensation has occurred in the dust sensor.
In this way, when it is determined that the intake mode is the external air mode, it is possible to determine whether or not dew condensation has occurred in the dust sensor.
In addition, according to a ninth aspect, the dust concentration detection apparatus includes: a sensor temperature determination section that determines a temperature of the dust sensor; an outside air temperature determination unit that determines a temperature outside of the vehicle; and an outdoor humidity determination portion that determines humidity outside the vehicle. When it is determined by the mode determination unit that the intake mode is the outside air mode, the dew condensation amount estimation unit determines the absolute humidity outside the vehicle room based on the temperature outside the vehicle room determined by the outside air temperature determination unit and the humidity outside the vehicle room determined by the outside humidity determination unit, determines the saturated water vapor amount of the dust sensor based on the temperature of the dust sensor determined by the sensor temperature determination unit, and estimates the amount of dew condensation that has occurred in the dust sensor based on the absolute humidity outside the vehicle room and the saturated water vapor amount of the dust sensor.
As described above, when it is determined that the intake mode is the outside air mode, the absolute humidity outside the vehicle compartment is determined based on the temperature outside the vehicle compartment and the humidity outside the vehicle compartment, the saturated water vapor amount of the dust sensor is determined based on the temperature of the dust sensor determined by the sensor temperature determination unit, and the amount of dew condensation that has occurred in the dust sensor is estimated based on the absolute humidity outside the vehicle compartment and the saturated water vapor amount of the dust sensor, so that the dew condensation elimination time can be determined with high accuracy.
The processing of S80 corresponds to the dew condensation determinator, the processing of S110 corresponds to the dew condensation amount estimator, and the processing of S130 corresponds to the dew condensation elimination time determinator. The process of S120 corresponds to the wind speed estimating unit, the process of S70 corresponds to the door opening/closing determining unit, the process of S90 corresponds to the outside air absolute temperature determining unit, the process of S100 corresponds to the saturated water vapor amount determining unit, and the process of S62 corresponds to the inside air mode determining unit. The process of S12 corresponds to the sensor temperature determination unit, the process of S30 corresponds to the internal air temperature determination unit, the process of S40 corresponds to the indoor humidity determination unit, the process of S63 corresponds to the external air mode determination unit, the process of S10 corresponds to the external air temperature determination unit, and the process of S20 corresponds to the outdoor humidity determination unit.

Claims (8)

1. A dust concentration detection device is characterized by comprising:
a dust sensor (32) that has a light-emitting portion (321) that emits light and a light-receiving portion (322) that receives light, and that detects the concentration of dust contained in air by the light-receiving portion receiving reflected light that is obtained by reflecting the light emitted from the light-emitting portion by the dust contained in the air;
a condensation determination unit that determines whether or not condensation has occurred in the dust sensor;
a dew condensation amount estimating unit that estimates an amount of dew condensation that has occurred in the dust sensor using at least one of a temperature and a humidity of air around the dust sensor when it is determined by the dew condensation determining unit that dew condensation has occurred in the dust sensor;
a dew condensation elimination time determination unit that determines a dew condensation elimination time until dew condensation that has occurred in the dust sensor is eliminated, based on the dew condensation amount estimated by the dew condensation amount estimation unit; and
a wind speed estimating unit that estimates a wind speed of the air around the dust sensor,
the dew condensation elimination time determination unit determines the dew condensation elimination time based on the air speed of the air around the dust sensor estimated by the air speed estimation unit and the dew condensation amount estimated by the dew condensation amount estimation unit.
2. The dust concentration detection apparatus according to claim 1,
the dust sensor is disposed in an air-conditioning case (21) in which a ventilation path (24) through which air blown into the interior of a vehicle flows is formed, and detects the concentration of dust contained in the air flowing through the ventilation path.
3. The dust concentration detection apparatus according to claim 2,
the vehicle door opening/closing determination unit determines whether or not there is opening/closing of a vehicle door opening by a vehicle door,
the condensation determination unit determines whether or not condensation has occurred in the dust sensor when the door opening/closing determination unit determines that the opening/closing of the door opening of the vehicle is present.
4. The dust concentration detection apparatus according to claim 3,
the disclosed device is provided with: an outside air absolute temperature determination portion that determines an absolute temperature outside the vehicle; and a saturated water vapor amount determination unit that determines a saturated water vapor amount in a room of the vehicle,
the dew condensation amount estimating unit estimates the amount of dew condensation that has occurred in the dust sensor based on the absolute temperature outside the vehicle determined by the outside air absolute temperature determining unit and the saturated water vapor amount inside the vehicle determined by the saturated water vapor amount determining unit.
5. The dust concentration detection apparatus according to claim 2,
an internal air mode determination unit that determines whether or not an intake mode of the ventilation path is an internal air mode of internal air introduced into a vehicle interior,
the condensation determination unit determines whether condensation has occurred in the dust sensor when the internal gas mode determination unit determines that the intake mode is the internal gas mode.
6. The dust concentration detection apparatus according to claim 5,
the disclosed device is provided with: a sensor temperature determination section that determines a temperature of the dust sensor; an interior gas temperature determination unit that determines a temperature in a room of the vehicle; and an indoor humidity determination portion that determines humidity in the room of the vehicle,
in a case where it is determined by the internal gas mode determination portion that the intake mode is the internal gas mode, the dew condensation amount estimation portion determines an absolute humidity in a vehicle interior based on the temperature in the vehicle interior determined by the internal gas temperature determination portion and the humidity in the vehicle interior determined by the indoor humidity determination portion, and determines a saturated water vapor amount of the dust sensor based on the temperature of the dust sensor determined by the sensor temperature determination portion, the dew condensation amount estimation portion estimates a dew condensation amount that has occurred in the dust sensor based on the absolute humidity in the vehicle interior and the saturated water vapor amount of the dust sensor.
7. The dust concentration detection apparatus according to any one of claims 2, 5, and 6,
an external air mode determination unit that determines whether or not an intake mode of the ventilation passage is an external air mode in which external air is introduced to the outside of the vehicle is provided,
the condensation determination unit determines whether condensation has occurred in the dust sensor when the external air mode determination unit determines that the intake mode is the external air mode.
8. The dust concentration detection apparatus according to claim 7,
the disclosed device is provided with: a sensor temperature determination section that determines a temperature of the dust sensor;
an outside air temperature determination unit that determines a temperature outside the vehicle; and
an outdoor humidity determination portion that determines humidity outside the vehicle,
in a case where it is determined by the external air mode determination unit that the intake mode is the external air mode, the dew condensation amount estimation unit determines an absolute humidity outside the vehicle room based on the temperature outside the vehicle room determined by the external air temperature determination unit and the humidity outside the vehicle room determined by the outdoor humidity determination unit, and determines a saturated water vapor amount of the dust sensor based on the temperature of the dust sensor determined by the sensor temperature determination unit, the dew condensation amount estimation unit estimating the amount of dew condensation that has occurred in the dust sensor based on the absolute humidity outside the vehicle room and the saturated water vapor amount of the dust sensor.
CN201880024046.3A 2017-08-31 2018-08-30 Dust concentration detection device Active CN110573861B (en)

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JP2017-166858 2017-08-31
JP2017166858A JP6662362B2 (en) 2017-08-31 2017-08-31 Dust concentration detector
PCT/JP2018/032238 WO2019045009A1 (en) 2017-08-31 2018-08-30 Dust concentration detection device

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CN110573861A CN110573861A (en) 2019-12-13
CN110573861B true CN110573861B (en) 2022-11-22

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7234784B2 (en) * 2019-05-07 2023-03-08 スズキ株式会社 Vehicle air conditioning controller
JP7298493B2 (en) * 2020-01-29 2023-06-27 トヨタ自動車株式会社 CONTROL DEVICE, VEHICLE, CONTROL SYSTEM, PROGRAM AND CONTROL METHOD
JP7398844B2 (en) * 2020-08-06 2023-12-15 ゴンガム センサー カンパニー リミテッド Light scattering type fine dust measuring device
WO2022130634A1 (en) * 2020-12-18 2022-06-23 三菱電機株式会社 Air conditioning system
CN115836206A (en) * 2021-02-16 2023-03-21 法雷奥日本株式会社 Air conditioner for vehicle
WO2022209985A1 (en) * 2021-03-29 2022-10-06 能美防災株式会社 Smoke detector
KR102448881B1 (en) * 2022-07-13 2022-09-28 김윤수 Particle concentration measurement method for ultra-precision electronic parts production process

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008037363A (en) * 2006-08-09 2008-02-21 Denso Corp Vehicular air conditioner
CN201255720Y (en) * 2008-07-17 2009-06-10 合肥百信机电科技有限公司 Optical measurement device for bug dust
EP2574868A2 (en) * 2011-09-29 2013-04-03 LG Electronics, Inc. Refrigerator
CN103398570A (en) * 2013-07-19 2013-11-20 华为技术有限公司 Equipment dehumidification method, condensation detection device and equipment
WO2017138130A1 (en) * 2016-02-10 2017-08-17 三菱電機株式会社 Power conversion device and air conditioning device

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6217642A (en) * 1985-07-17 1987-01-26 Automob Antipollut & Saf Res Center Apparatus for detecting cloudiness of windowpane of automobile
JP2760510B2 (en) * 1988-07-07 1998-06-04 能美防災株式会社 Fire alarm
JP2746920B2 (en) * 1988-07-07 1998-05-06 能美防災株式会社 Fire alarm
JPH0765269A (en) * 1993-08-30 1995-03-10 Matsushita Electric Works Ltd Photoelectric smoke sensor and its smoke sensing method
JP3896710B2 (en) * 1998-11-13 2007-03-22 三菱自動車工業株式会社 Air conditioning control device for vehicles
JP4147650B2 (en) * 1998-11-13 2008-09-10 三菱自動車工業株式会社 Air conditioning control device for vehicles
JP2003326938A (en) * 2002-05-15 2003-11-19 Denso Corp Air-conditioning defogging control device for vehicle
JP4311270B2 (en) * 2004-04-21 2009-08-12 株式会社デンソー Air conditioner for vehicles
JP2008275390A (en) * 2007-04-26 2008-11-13 Denso Corp Raindrop detection device
JP5111219B2 (en) * 2008-04-22 2013-01-09 キヤノン株式会社 Optical equipment
JP2013246148A (en) * 2012-05-29 2013-12-09 Sharp Corp Floating fine particle sensing device and smoke sensor
JP6167297B2 (en) * 2013-07-25 2017-07-26 パナソニックＩｐマネジメント株式会社 Ventilation equipment
KR102379628B1 (en) * 2015-06-08 2022-03-29 삼성전자주식회사 Air conditioer and displaying method for dust concentration using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008037363A (en) * 2006-08-09 2008-02-21 Denso Corp Vehicular air conditioner
CN201255720Y (en) * 2008-07-17 2009-06-10 合肥百信机电科技有限公司 Optical measurement device for bug dust
EP2574868A2 (en) * 2011-09-29 2013-04-03 LG Electronics, Inc. Refrigerator
CN103398570A (en) * 2013-07-19 2013-11-20 华为技术有限公司 Equipment dehumidification method, condensation detection device and equipment
WO2017138130A1 (en) * 2016-02-10 2017-08-17 三菱電機株式会社 Power conversion device and air conditioning device

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