JP2015054688A - Vehicle interior humidity inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle interior humidity inspection device capable of accurately inspecting a humidity in a vehicle interior.SOLUTION: A vehicle interior humidity calculation device includes a processor that calculates an increment of an absolute humidity in a vehicle interior on the basis of a first predetermined parameter, and also calculates a decrement of the absolute humidity in the vehicle interior on the basis of a second predetermined parameter. The processor calculates an absolute humidity in the vehicle interior on the basis of the amount of change of the absolute humidity obtainable from the increment and decrement of the calculated absolute humidity and an initial value of the absolute humidity.

Description

  The present disclosure relates to a vehicle interior humidity prediction apparatus.

  Conventionally, it is necessary to predict the humidity in the passenger compartment based on the number of passengers and whether or not there is rainfall, and to change the control mode of the auto air conditioner to the defroster mode based on the temperature in the passenger compartment and the humidity in the passenger compartment. An automatic air conditioner control device for a vehicle that determines whether or not is known is known (for example, see Patent Document 1).

JP 2002-137630 A

  However, in the configuration described in Patent Document 1, only parameters (occupants and rainfall) that increase the humidity in the passenger compartment are taken into consideration, and therefore there is a possibility that the humidity is predicted to be higher than the actual humidity.

  Therefore, an object of the present disclosure is to provide a vehicle interior humidity prediction apparatus that can accurately predict the humidity in the vehicle interior.

  According to one aspect of the present disclosure, the absolute humidity increase amount in the vehicle interior is calculated based on the first predetermined parameter, and the absolute humidity decrease amount in the vehicle interior is calculated based on the second predetermined parameter. A vehicle interior humidity calculation device comprising a processing device that calculates the absolute humidity in the vehicle interior based on the amount of change in absolute humidity obtained from the calculated increase and decrease in absolute humidity and the initial value of the absolute humidity. Provided.

  According to the present disclosure, it is possible to obtain a vehicle interior humidity prediction device that can accurately predict the humidity in the vehicle interior.

It is a figure which shows the structure of the vehicle interior humidity calculation apparatus 1 by one Example. It is a figure which shows an example of the air conditioner. 4 is a flowchart illustrating an example of processing executed by the processing device 10. It is a figure which shows the relationship between absolute humidity and temperature. It is a figure which shows notionally the moisture movement factor used as the factor of a vehicle interior humidity change. It is a figure which shows the relationship between temperature and absolute humidity.

  Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a diagram illustrating a configuration of a vehicle interior humidity calculating apparatus 1 according to an embodiment. The vehicle interior humidity calculation device 1 includes a processing device 10.

  The processing device 10 may be configured by an arithmetic processing device including a CPU. The processing device 10 has various functions described below. Various functions (including functions described below) of the processing device 10 may be realized by arbitrary hardware, software, firmware, or a combination thereof. For example, any or all of the functions of the processing apparatus 10 may be realized by an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or a digital signal processor (DSP). Further, the processing device 10 may be realized by a plurality of processing devices. In the following description, as an example, the processing device 10 is described as being embodied as an air conditioner ECU that controls the air conditioner, for example.

  An outside air temperature sensor 12, an inside air temperature sensor 14, and a vehicle speed sensor (wheel speed sensor) 16 are connected to the processing device 10. This connection may be a direct connection or a connection via a bus such as another ECU or a CAN (controller area network).

  An air conditioner (air conditioner) 20 is connected to the processing device 10. The processing apparatus 10 may perform various controls of the air conditioner 20. For example, the processing device 10 may execute switching to the defroster mode (automatic) or the like so as not to cause fogging or the like in the front windshield or the like based on the absolute humidity in the vehicle interior calculated as described later.

  The processing device 10 acquires control information of the air conditioner 20 (hereinafter, air conditioner control information). The air conditioner control information may include information related to the blower air volume and the opening degree of the inside / outside air damper (hereinafter referred to as “inside / outside air damper opening degree”). In this example, since the processing apparatus 10 is embodied as an air conditioner ECU, the air conditioner control information is control information (various control values) generated by itself. Alternatively, the air conditioner control information is generated based on setting states (that is, various setting values) set by operation switches operated by the user (for example, switches arranged on an instrument panel or touch switches on a display). May be.

  FIG. 2 is a diagram illustrating an example of the air conditioner 20. Although the structure of the air conditioner 20 is arbitrary, a structure as shown, for example in FIG. 2 may be sufficient.

  In the example shown in FIG. 2, the air conditioner 20 includes a compressor (not shown) that compresses a refrigerant using an engine or the like as a power source, and the refrigerant compressed by the compressor circulates in the refrigerant passage and is cooled by a condenser. It is supplied to the evaporator 26. The evaporator 26 is provided in the vehicle interior. As shown in FIG. 2, a blower motor (blower fan) 22 whose rotational speed can be adjusted is disposed on the front side of the evaporator 26. The blower motor 22 communicates with the outside of the vehicle or the vehicle interior via an inside / outside air damper (outside / inside air door) 29. The blower motor 22 has a function of sending air outside the vehicle or inside the vehicle (that is, outside air or inside air) into the vehicle interior via the evaporator 26.

  In the example shown in FIG. 2, when the blower motor 22 rotates, the air that flows in via the inside / outside air damper 29 (that is, outside air or inside air) passes through the evaporator 26. At this time, the ratio of the flow rate of the outside air and the inside air in the inflowing air depends on the opening degree of the inside / outside air damper 29. The evaporator 26 cools the air passing through the evaporator 26 by evaporating the refrigerant compressed by the compressor during cooling. A heater core 21 is disposed on the downstream side of the evaporator 26. An air mix door 24 whose opening degree is adjustable is set in the heater core 21. The heater core 21 performs a function (reheat function) of mixing warm air with air (cold air) cooled by the evaporator 26 using waste heat from the engine. The temperature of the air sent into the passenger compartment is adjusted by controlling the opening degree of the air mix door 24 (that is, the mixture ratio of cold air and warm air). On the downstream side of the heater core 21, ducts for guiding the mixed air to the outlets provided at predetermined locations in the passenger compartment are arranged. A mode door 28 for selectively introducing the mixed air to a predetermined outlet is set on the downstream side of the heater core 21.

  FIG. 3 is a flowchart illustrating an example of processing executed by the processing device 10. FIG. 4 is a diagram showing the relationship between absolute humidity and temperature. The process shown in FIG. 3 may be executed, for example, every time a predetermined period ΔT (for example, 1 second) is started when the ignition switch is turned on and then the ignition switch is turned off.

  In step 300, room temperature information is acquired from the inside air temperature sensor 14.

  In step 302, an initial value of the in-vehicle absolute humidity is calculated. The initial value of the absolute humidity inside the vehicle may be an arbitrary value. In this example, the initial value of the vehicle interior absolute humidity is calculated based on the room temperature obtained in step 300 above. That is, based on the relationship shown in FIG. 4, the absolute humidity according to the current room temperature and the current relative humidity is calculated. At this time, the initial value of the in-vehicle absolute humidity may be calculated on the assumption that the current relative humidity is 100%. Alternatively, other values may be used as the current relative humidity instead of 100%. In this case, the other value may be a fixed value set according to the destination, or a variable value that is variable based on the current season, date and time, rainfall conditions (weather information) around the vehicle position, etc. It may be.

  In step 304, the number of passengers, the inside / outside air damper opening, the blower air volume (the rotation speed of the blower motor 22), and the outside air temperature are calculated and acquired. The number of passengers may be calculated by any method. For example, the number of passengers may be calculated based on a pressure sensor or the like provided on each seat. The outside air temperature is acquired from the outside air temperature sensor 12. The inside / outside air damper opening and the blower air volume may be based on the air conditioner control information.

  In the system 306, the absolute humidity increase amount is calculated based on the parameter obtained in step 304 above. The absolute humidity increase amount may be, for example, an increase amount of absolute humidity per time corresponding to the processing cycle ΔT. The calculation method of the absolute humidity increase amount may be arbitrary. For example, the absolute humidity increase amount may include at least one of an increase amount due to moisture released from the occupant and an increase amount due to ventilation of the inside and outside air. The increase amount resulting from the occupant may be calculated based on the number of occupants in a manner that increases as the number of occupants increases. Further, the increased amount due to ventilation may be calculated from the ventilation air volume entering the vehicle interior based on the inside / outside air damper opening degree and the like, and the calculated ventilation air volume and the outside air humidity. The outside air humidity may be calculated using a map, for example, according to the outside air temperature, or may be calculated based on weather information that may be acquired from outside by communication.

  In step 308, the vehicle speed from the vehicle speed sensor 16 is acquired. The vehicle speed may be calculated based on the position of the vehicle measured by a GPS (Global Positioning System) receiver instead of or in addition to the vehicle speed from the vehicle speed sensor 16, or the rotation speed of the output shaft of the transmission. May be calculated based on the detected value.

  In step 310, the absolute humidity reduction amount is calculated based on the inside / outside air damper opening and the blower air volume obtained in step 304 and the vehicle speed obtained in step 308. The absolute humidity reduction amount may be, for example, an absolute humidity reduction amount per time corresponding to the processing cycle ΔT. The calculation method of the absolute humidity reduction amount may be arbitrary. For example, the amount of decrease in absolute humidity is due to the amount of decrease due to the ventilation of the inside and outside air, the condensation at a low temperature part in the vehicle interior (for example, glass member such as front windshield, side glass, rear glass, evaporator 26, etc.) Any one or more of the reduction amount and the reduction amount due to moisture absorption to the interior member (particularly, the fibrous interior member) in the vehicle interior or the gap may be included.

  The calculation method of the reduction amount resulting from the ventilation of the inside and outside air may be arbitrary. For example, it may be calculated from the calculated ventilation air flow and the absolute humidity inside the vehicle based on the inside / outside air damper opening and the vehicle speed. The vehicle speed can be used to include the dynamic pressure air volume in the ventilation air volume, but the dynamic pressure air volume may not be considered. As the in-vehicle absolute humidity, the in-vehicle absolute humidity calculated in the previous cycle (see step 314 described later) may be used. In the initial processing routine, the initial value of the in-vehicle absolute humidity (see step 302) may be used as the in-vehicle absolute humidity.

  Moreover, the calculation method of the reduction amount resulting from the low-temperature site | part in a vehicle interior may be arbitrary. For example, it may be calculated based on the relationship between the temperature of the low temperature part, the dew point temperature, and the vehicle interior absolute humidity. For example, when the low temperature part is the front windshield, the absolute humidity near the front windshield may be calculated using the temperature (glass temperature) of the front windshield. The glass temperature may be calculated based on the inside air temperature, the outside air temperature, and the vehicle speed. For example, the amount of decrease due to the low temperature region in the passenger compartment is set to 0 when the temperature of the low temperature region is higher than the dew point temperature (that is, the absolute humidity near the low temperature region is higher than the absolute humidity inside the vehicle). If the temperature is lower than the dew point temperature, it may be a value corresponding to the area (design value) of the low temperature part, the temperature of the low temperature part, and the absolute humidity inside the vehicle. Similarly, as the vehicle interior absolute humidity, the vehicle interior absolute humidity (see step 314 described later) calculated in the previous cycle may be used. In the first processing routine, the initial value of the vehicle absolute humidity (see step 302) may be used as the vehicle absolute humidity.

  Moreover, the calculation method of the reduction | decrease amount resulting from the moisture absorption to the interior member etc. in a vehicle interior may be arbitrary. For example, the amount of decrease due to moisture absorption by the interior member or the like in the passenger compartment may be calculated using the point that the moisture absorption speed is proportional to the difference between the equilibrium moisture absorption amount and the current adsorption amount. At this time, a characteristic (for example, a BET adsorption type) that increases as the relative humidity (relative humidity with respect to the interior member) increases may be used as the equilibrium moisture absorption amount. The relative humidity with respect to the interior member may be calculated based on a ratio of the in-vehicle absolute humidity to the absolute humidity within the interior member corresponding to the temperature of the interior member. The temperature of the interior member may be calculated based on the inside air temperature and the outside air temperature. Similarly, as the vehicle interior absolute humidity, the vehicle interior absolute humidity (see step 314 described later) calculated in the previous cycle may be used. In the first processing routine, the initial value of the vehicle absolute humidity (see step 302) may be used as the vehicle absolute humidity.

  In step 312, the absolute humidity change amount is calculated based on the absolute humidity increase amount obtained in step 306 and the absolute humidity decrease amount obtained in step 310. The amount of change in absolute humidity may be calculated by simply subtracting the amount of decrease in absolute humidity from the amount of increase in absolute humidity.

  In step 314, the in-vehicle absolute humidity is calculated based on the previous value of the in-vehicle absolute humidity (the in-vehicle absolute humidity obtained in step 314 of the previous processing cycle) and the amount of change in the absolute humidity obtained in step 312 above. The vehicle interior absolute humidity (current value) may be calculated as the sum of the previous value of the vehicle interior absolute humidity and the amount of change in absolute humidity obtained in step 312. As the previous value of the in-vehicle absolute humidity, the initial value of the in-vehicle absolute humidity obtained in step 302 may be used in the first processing cycle. When the processing in step 314 is completed, the processing starts from step 304 in the next processing cycle. In this case, in the next processing cycle, the absolute humidity obtained in the current cycle is used in this step 314 as the previous value of the in-vehicle absolute humidity.

  According to the example shown in FIG. 3, the absolute humidity increase amount in the vehicle is calculated, the absolute humidity decrease amount in the vehicle is calculated, and the absolute humidity increase in the vehicle is calculated based on the calculated absolute humidity increase amount and the absolute humidity decrease amount. Is calculated. Thus, since not only the absolute humidity increase amount in the vehicle but also the absolute humidity decrease amount in the vehicle is taken into consideration, the accurate absolute humidity in the vehicle can be calculated in consideration of the decrease factor of the humidity in the vehicle interior.

  Further, according to the example shown in FIG. 3, the initial value of the absolute humidity in the vehicle is a value based on assumptions as described above, and there may be a large deviation (error) from the actual absolute humidity in the vehicle. Such an error is gradually reduced by calculation every predetermined period, so that it is possible to finally calculate an accurate in-vehicle absolute humidity. Specifically, for example, assuming that the initial value of the absolute humidity in the vehicle is significantly larger than the actual absolute humidity in the vehicle (the same applies to the case where it is significantly smaller), the absolute humidity reduction amount calculated in step 310 above is assumed. Also, the absolute value is larger than the actual absolute humidity reduction amount. This is because the absolute humidity reduction amount is calculated according to the in-vehicle absolute humidity (initial value or previous value) as described above.

  Note that the processing shown in FIG. 3 is executed every certain predetermined period ΔT, but the predetermined period ΔT may be varied. That is, the process shown in FIG. 3 may be executed at irregular intervals. In this case, a change amount (absolute humidity increase amount and absolute humidity decrease amount) from the previous cycle may be calculated in step 306 and step 310.

  FIG. 5 is a diagram conceptually showing a moisture transfer factor that causes a change in the humidity in the passenger compartment.

  As shown in FIG. 5, factors that increase the absolute humidity in the vehicle include moisture P <b> 1 contained in the outside air entering the vehicle interior due to ventilation and moisture P <b> 2 released from the passenger. Further, as shown in FIG. 5, the factors that decrease the absolute humidity inside the vehicle are moisture P3 contained in the inside air that goes out of the passenger compartment due to ventilation, moisture P4 that condenses in a low temperature part (for example, a front windshield) in the passenger compartment, In addition, there is moisture P5 that is absorbed by interior members and the like in the passenger compartment.

  Accordingly, if the absolute humidity in the vehicle is calculated taking into account only the factor that increases the absolute humidity in the vehicle, the absolute humidity in the vehicle will be calculated higher. On the other hand, according to the example shown in FIG. 3 described above, the factor for decreasing the absolute humidity in the vehicle (the amount of decrease in absolute humidity) is taken into account, so that the absolute humidity in the vehicle can be calculated with high accuracy.

  In order to calculate the accurate absolute humidity in the vehicle, it is preferable to consider both of the two factors P1 and P2 that increase the absolute humidity in the vehicle, and to decrease the absolute humidity P3, P4, and P5 in the vehicle. All of these are considered. For example, in the case of the process shown in FIG. 3, in step 306, the absolute humidity increase amount is preferably calculated in consideration of both of the two factors P1 and P2 of increasing the absolute humidity in the vehicle. In step 310, preferably, the absolute humidity reduction amount is calculated in consideration of all three reduction factors P3, P4, and P5 of the absolute humidity in the vehicle. However, any one of these may be omitted.

  FIG. 6 is a diagram showing the relationship between temperature and absolute humidity.

  The in-vehicle absolute humidity (calculated absolute temperature) obtained by the process of FIG. 3 described above may be used in various modes for various controls of the air conditioner 20. For example, as shown in FIG. 6, the intersection of the calculated absolute temperature and a curve of 100% relative humidity may be calculated as the “dew point temperature”. In this case, for example, when the glass temperature of the front windshield approaches the dew point temperature, control to prevent fogging (for example, automatic switching to the defroster mode or advice to prompt the passenger to switch to the defroster mode) ) May be executed. Further, as schematically shown in FIG. 6, the relative humidity corresponding to the room temperature may be calculated based on the room temperature (obtained from the inside air temperature sensor 14) and the calculated absolute temperature.

  According to the vehicle interior humidity calculating device 1 of the present embodiment described above, the following excellent effects are achieved, among others.

  As described above, since the vehicle interior absolute humidity is calculated in consideration of not only the vehicle interior absolute humidity increase amount but also the vehicle interior absolute humidity decrease amount, the vehicle interior absolute humidity can be calculated with high accuracy. For this reason, various control of the air conditioner 20 becomes possible using the calculated absolute humidity in the vehicle, the necessity of separately providing a humidity sensor is eliminated, and cost reduction (number of parts) can be achieved. In addition, it is possible to control the air conditioner 20 with high reliability using the in-vehicle absolute humidity. Thereby, for example, efficient control can be performed in a manner in which condensation does not occur on the front windshield or the like, and both safety and air conditioning efficiency can be improved.

  Although each embodiment has been described in detail above, it is not limited to a specific embodiment, and various modifications and changes can be made within the scope described in the claims. It is also possible to combine all or a plurality of the components of the above-described embodiments.

DESCRIPTION OF SYMBOLS 1 Car interior humidity calculation apparatus 10 Processing apparatus 12 Outside temperature sensor 14 Inside temperature sensor 16 Vehicle speed sensor 20 Air conditioner

Claims (7)

  The amount of increase in absolute humidity in the vehicle interior is calculated based on the first predetermined parameter, the amount of decrease in absolute humidity in the vehicle interior is calculated based on the second predetermined parameter, and the amount of increase in absolute humidity calculated and A vehicle interior humidity calculation device comprising a processing device that calculates the absolute humidity in the vehicle interior based on the amount of change in absolute humidity obtained from the amount of decrease and the initial value of the absolute humidity.   The said processing apparatus calculates at least any one of the dehumidification amount by ventilation, the dehumidification amount by condensation, and the dehumidification amount by moisture absorption, and calculates the reduction | decrease amount of the said absolute humidity. Car interior humidity calculation device.   The second predetermined parameter includes at least one of a detected value of an indoor temperature, a detected value of an outdoor temperature, a detected value of a vehicle speed, and a control value or a set value of an air conditioner. 2. The vehicle interior humidity calculation device according to 2.   The vehicle interior humidity calculation device according to claim 3, wherein the control value or the set value of the air conditioner relates to a blower air volume and an opening degree of the inside / outside air damper.   The processing device calculates an increase amount and a decrease amount of the absolute humidity every predetermined time, and integrates a change amount of the absolute humidity obtained every predetermined time into an initial value of the absolute humidity every predetermined time. Thus, the vehicle interior humidity calculation device according to claim 1, wherein the absolute humidity is calculated every predetermined time.   The vehicle interior humidity calculation device according to claim 5, wherein the processing device sets an absolute humidity according to a detected value of the indoor temperature and a predetermined relative humidity as an initial value of the absolute humidity.   The second predetermined parameter is at least one of a previous calculated value of the absolute humidity, a detected value of the indoor temperature, a detected value of the outdoor temperature, a detected value of the vehicle speed, and a control value or a set value of the air conditioner The vehicle interior humidity calculation device according to claim 5 or 6, including any one of them.

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