JP2005029129A - Method and device for adjusting humidity in vehicle compartment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for adjusting a humidity in a vehicle compartment in which a humidity adjustment is not carried out if not needed and further, a humidity adjustment can be performed positively if needed. <P>SOLUTION: A first dew formation estimated condition applied for estimating an occurrence of dew formation is set in response to a predetermined relation between a temperature difference between an external surrounding temperature and a compartment temperature when an inner surface of a glass shows a dew formation, and an indoor humidity, and in addition, a second dew formation estimated condition applied for estimating an occurrence of dew formation is set before the former condition is satisfied. When a dew formation sensor DEW does not sense a dew formation state, an air conditioner 11 is operated. In addition, when the dew formation sensor DEW does not sense the dew formation state, the air conditioner 11 is operated when the occurrence of dew formation is estimated under application of the temperature difference, indoor humidity and the first dew formation estimated condition. After this operation, when an occurrence of dew formation is estimated under application of the temperature difference, indoor humidity and the second dew formation estimating condition, the air conditioner 11 is operated. Subsequently, the indoor humidity is adjusted through alternative application of the first and second dew formation estimating conditions. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a humidity adjusting method and a humidity adjusting device for a vehicle compartment for adjusting the humidity inside the vehicle compartment to prevent dew condensation on the inner surface of the glass of the vehicle.

Conventionally, various methods and apparatuses have been proposed to prevent the inner surface of the glass of the vehicle from condensing by operating the air conditioner of the vehicle to adjust the humidity inside the vehicle.
JP-A-2-304343 No. 3-36180 JP-A-5-147436 Japanese Patent No. 3334410

  Conventionally proposed various humidity adjustment methods and devices have problems such as frequent humidity adjustment and failure to adjust humidity when necessary.

  An object of the present invention is to provide a humidity adjustment method and apparatus in a vehicle compartment that can perform humidity adjustment reliably when necessary without being adjusted more than necessary.

  A humidity adjustment method for a vehicle interior to be improved by the present invention includes a first temperature sensor for measuring the temperature outside the vehicle or the temperature of the glass, and a second temperature sensor for measuring a temperature corresponding to the room temperature of the vehicle. And a dew condensation sensor for detecting the dew condensation state on the inner surface of the glass and a humidity sensor for measuring the indoor humidity of the vehicle, and based on the outputs of the first and second temperature sensors, the dew condensation sensor and the humidity sensor, The indoor humidity is adjusted by controlling the operation of the air conditioner mounted on the vehicle.

  In the method of the present invention, the first dew condensation used for estimating that dew condensation occurs based on the relationship between the temperature difference between the outside temperature of the vehicle and the room temperature when the inner surface of the glass obtained in advance is dewed, and the room humidity. An estimation condition is set, and a second dew condensation estimation condition used for estimating that dew condensation occurs before the first dew condensation prevention condition is satisfied. When the dew condensation sensor detects the dew condensation state, the air conditioner is activated. In addition, when the dew condensation sensor does not detect the dew condensation state, the air conditioner is operated for a predetermined time when the occurrence of dew condensation is first estimated using the temperature difference, the room humidity, and the first dew condensation estimation condition. . Thereafter, the air conditioner is operated for a predetermined time when the occurrence of condensation is estimated using the temperature difference, the room humidity, and the second condensation estimation condition. Thereafter, the indoor humidity is adjusted by alternately using the first dew condensation estimation condition and the second dew condensation estimation condition.

  In this way, if the first and second dew condensation estimation conditions are appropriately determined, the dew condensation preventing operation can be performed without frequently operating the air conditioner. Further, by appropriately defining the first and second condensation estimation conditions, it is possible to reliably prevent the occurrence of condensation without operating the air conditioner more than necessary.

  If the second temperature sensor is disposed in the vicinity of the inner surface of the glass and the humidity sensor is disposed in the vicinity of the inner surface of the glass, it is possible to accurately prevent the dew condensation operation by accurately reflecting the situation near the location where the dew condensation occurs. Therefore, the condensation prevention operation can be made more reliable.

The first dew condensation estimation condition is that the indoor humidity is H, the temperature difference is ΔT, and K1 to K4 are coefficients.
H> K1 · ΔT ³ + K2 · ΔT ² + K3 · ΔT + K4
It is preferable to determine it based on the following formula. In addition, the second dew condensation estimation condition is defined such that H in this equation is H−α, ΔT is ΔT + β (where α and β are predetermined correction constants), and α and β are the first dew condensation estimation conditions. It is preferable that the difference between the indoor humidity conditions satisfying the dew condensation condition is 3% or more when used and when the second dew condensation estimation condition is used. By using such an expression, it is possible to estimate the condensation easily and with relatively high accuracy without using a complicated arithmetic expression. K1 is a value between 0.026 and 0.027, K2 is a value between 0.2 and 0.21, K3 is a value between 6 and 7, and K4 is a value between 90 and 110. It is preferable to do this. If it is these temperature ranges, generation | occurrence | production of dew condensation can be reliably prevented on general use conditions.

  The humidity adjusting apparatus for a vehicle interior according to the present invention includes a first temperature sensor for measuring the temperature outside the vehicle, a second temperature sensor for measuring a temperature corresponding to the room temperature of the vehicle, and a dew condensation state on the inner surface of the glass. A condensation sensor for detecting the humidity, a humidity sensor for measuring the humidity inside the vehicle, and an air conditioner mounted on the vehicle for humidity adjustment based on the outputs of the first and second temperature sensors, the condensation sensor and the humidity sensor And a drive signal generator that outputs a drive signal for outputting a command for forcibly operating the air conditioner, and adjusts the indoor humidity by controlling the operation of the air conditioner. In the present invention, the signal generation device includes a storage unit and a drive signal generation unit. The storage means is a first dew condensation estimation condition used for estimating that dew condensation occurs based on a relationship between a temperature difference between the outside temperature of the vehicle and the room temperature when the inner surface of the glass obtained in advance is dewed, and the room humidity. And a second dew condensation estimation condition used for presuming that dew condensation occurs before the first dew condensation prevention condition is satisfied. The drive signal generating means outputs a drive signal for operating the air conditioner when the dew condensation sensor detects the dew condensation state. When the occurrence of condensation is estimated using the indoor humidity and the first dew condensation estimation condition, a drive signal for operating the air conditioner for a predetermined time is output, and thereafter, the temperature difference, the indoor humidity and the second dew condensation estimation condition are determined. A drive signal for operating the air conditioner for a predetermined time when the occurrence of dew condensation is estimated using the output, and thereafter driving to adjust indoor humidity by alternately using the first dew condensation estimation condition and the second dew condensation estimation condition Output a signal. According to the apparatus of the present invention, the method of the present invention can be reliably realized.

  In addition, it is preferable that the 2nd temperature sensor is arrange | positioned in the vicinity of the inner surface of glass with a dew condensation sensor or a humidity sensor. In this way, the temperature at the location where condensation occurs can be measured with higher accuracy, so that the operation accuracy of the apparatus can be improved.

  According to the present invention, by appropriately determining the first and second dew condensation estimation conditions, it is possible to perform the dew condensation prevention operation without frequently operating the air conditioner and to operate the air conditioner more than necessary. There is an advantage that it is possible to reliably prevent the occurrence of condensation without causing it.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an outline of sensor arrangement and device configuration of a device that implements a humidity adjustment method for a vehicle interior according to the present invention. FIG. 2 is a block diagram showing the circuit configuration. 1 and 2, a dew sensor unit 3 in which a dew condensation sensor and a second temperature sensor are united, and a humidity sensor unit in which a humidity sensor and a first temperature sensor are united are provided in a room 2 of the vehicle 1. 4 are arranged. In this embodiment, the dew condensation sensor unit 3 is attached to the inner upper area of the windshield 5 of the vehicle, and the humidity sensor unit 4 is attached to the inner lower area of the windshield 5. The second temperature sensor TS2 included in the dew condensation sensor unit 3 is arranged so as to measure the room temperature in the vicinity of the windshield 5. That is, the second temperature sensor TS2 is disposed in the dew condensation sensor unit 3 so as not to contact the inner surface of the windshield 5. The first temperature sensor TS1 included in the humidity sensor unit 4 is arranged so that the temperature of the windshield 5 can be directly measured. That is, the first temperature sensor TS1 is arranged in the humidity sensor unit 4 so that the windshield 5 and the measurement part of the temperature sensor TS1 are in direct contact with each other. The output from the condensation sensor DEW in the condensation sensor unit 3 is A / D converted by the condensation sensor output processing circuit 6. The output of the second temperature sensor TS2 in the dew condensation sensor unit 3 is A / D converted by the second temperature sensor output processing circuit 7. The outputs of the humidity sensor H and the first temperature sensor TS1 in the humidity sensor unit 4 are A / D converted by the temperature / humidity sensor output circuit 8, respectively. In this example, the temperature outside the vehicle is measured by a third temperature sensor 9 disposed outside the room 2, and the output is A / D converted by the temperature sensor output circuit 9. The output of the temperature sensor output circuit 9 is used for indoor temperature and humidity adjustment. The output from each sensor output circuit is input to the control circuit 10 for signal processing, and the signal processing result is output to the auto air conditioner 11 as a drive signal.

  In FIG. 2, each sensor output circuit 6-9 is displayed as an A / D converter. The control circuit shown in FIG. 1 is constituted by the central processing unit 12 shown in FIG. In FIG. 2, 13 is a rectifier circuit that rectifies the output from the generator driven by the vehicle engine, and 14 is a DC-DC converter that changes the output of the rectifier to a required voltage value.

  FIG. 3 is a flowchart showing a software algorithm used when the method of the present invention is realized using the central processing unit 12 composed of a microcomputer on the premise of the configuration of FIG. FIG. 4 is a graph showing the relationship between the vehicle interior temperature and the vehicle interior temperature at which the window glass begins to condense according to the window glass temperature, and FIG. 5 shows the temperature difference between the vehicle interior temperature and the vehicle exterior temperature and the window glass begins to condense. It is the graph which showed the relationship with vehicle interior temperature according to the temperature of the window glass.

  Before describing the flowchart of FIG. 3, conditions for occurrence of condensation will be described with reference to FIGS. 4 and 5.

In the description below,
e _s (T): saturated water vapor pressure at a temperature T ° C. e: water vapor pressure of vehicle interior air H: vehicle interior air relative temperature. The water vapor pressure e of the interior air (T _R ° C) is a relative temperature H,
a _{e = e s (T R)} × H. If the temperature or the relative temperature is controlled so that e does not exceed the saturated water vapor pressure e _s (T _G ) at the temperature T _G of the vehicle interior glass, it becomes possible to prevent dew condensation. This can be expressed as follows.

e _s (T _R ) × H ≦ e _s (T _G )
By using the above formula, the conditions under which the window glass does not condense can be calculated from various viewpoints. FIG. 5 shows the relationship between the temperature difference ΔT and the humidity at which the window glass is condensed, and it can be seen that the temperature difference hardly depends on the window glass temperature. The lower approximate expression obtained from this graph is a conditional expression for dew condensation determination using ΔT and the vehicle interior temperature (H).

H> K1 · ΔT ³ + K2 · ΔT ² + K3 · ΔT + K4
In step ST1, necessary initial settings are made at the time of startup. Next, in step ST2, the air conditioner ON flag becomes ACONF = 0. This initially places the air conditioner in an inactive state. Next, in step ST3, the dew condensation flag becomes DEWONF = 0, and a state in which the dew condensation sensor does not detect dew condensation is created. Step ST4SW, humidity sensor H, first temperature sensors T1 and T2, and a value obtained by A / D converting the output of dew condensation sensor DEW are input.

  In step ST5, the presence or absence of condensation is determined based on the output of the condensation sensor DE. If condensation occurs on the inner surface of the glass at this stage, the process proceeds to step ST6, the air conditioner ON flag becomes ACONF = 1, and the process proceeds to step ST11. In step ST11, ACONF = 1? Is made. In this case, since ACONF = 1, K advances to step ST12 and the air conditioner is turned on. This ON state is maintained during the timer period of step ST14. Therefore, if there is condensation on the glass at the start-up, the air conditioner is immediately activated to reduce the humidity in the room.

  If dew condensation is not detected in step ST5, the process proceeds to step ST7, where the dew sensor flag state “DEWONF = 0?” Is determined. At the time of start-up, since DEWONF = 0 in step ST3, the determination result in step ST7 is “0”, and the process proceeds to step ST8. In step ST8, it is determined whether or not there is a possibility of a dew condensation state from the determination result of the determination formula A for determining the first dew condensation estimation condition. This judgment formula A is as follows.

H> K1 · ΔT ³ + K2 · ΔT ² + K3 · ΔT + K4
In this equation, the indoor humidity is H, and ΔT is a first temperature sensor TS1 that measures the temperature outside the vehicle or the temperature of the glass, and a second temperature sensor TS2 that measures a temperature corresponding to the room temperature of the vehicle. It is a temperature difference, and K1 to K4 are coefficients. The coefficient K1 is a value between 0.026 and 0.027, the coefficient K2 is a value between 0.2 and 0.21, the coefficient K3 is a value between 6 and 7, and the coefficient K4 is It is a value between 90 and 110. In a specific embodiment, K1 = 0.0267, K2 = 0.022, K3 = 6.52, and K4 = 100.

  The first dew condensation estimation condition is a condition close to the relationship between the temperature difference ΔT theoretically determined according to the temperature of the window glass and the indoor humidity at which dew condensation starts. Incidentally, this is a determination formula for determining whether or not the condition approximated to the curve A in FIG. 4B described later is satisfied. If it is determined in step ST8 that condensation is likely to occur from the relationship between the temperature difference and the humidity, the process proceeds to step ST9 and the condensation flag is set to DEWONF = 1. In step ST10, the air conditioner flag is ACONF = 1. Then, it progresses to step ST11 and an air conditioner will be in an operation state similarly to the above, and indoor dehumidification is performed.

  If it is determined in step ST8 that the result of the determination formula A is not likely to cause condensation, the process proceeds to step ST81, and the flag of the air conditioner becomes ACONF = 0. Then, the process proceeds to step ST82. In step ST82, it is determined whether or not the air conditioner mounted on the vehicle is set to automatic operation. If the automatic operation is not set, the process proceeds to NO, and the determination result is “0” in step ST11, and the air conditioner is turned off. If it is confirmed in step ST82 that the automatic operation of the air conditioner has been set, the process proceeds to step ST10 where ACONF = 1, and the process proceeds to step ST11.

  When the timer time limit coefficient in step ST14 ends, the process returns to step ST4. If the condensation does not occur in step ST5 and the process proceeds to step ST7, the process proceeds to step ST71 since DEWONF = 1. In step ST71, the possibility of dew condensation is determined according to determination formula B, which is the second dew condensation estimation condition. In this determination formula B, H is H−α and ΔT is ΔT + β in the above first dew condensation estimation condition formula. Where α and β are predetermined correction constants. These α and β are determined so that the difference in indoor humidity that satisfies the dew condensation condition is 3% or more when the first dew condensation estimation condition is used and when the second dew condensation estimation condition is used. . Preferably, α and β are determined so that the humidity difference is 5% or more. This judgment formula B is a judgment formula as to whether or not the condition shown by the characteristic curve B shown by the alternate long and short dash line in FIG.

  If it is determined in step ST71 that condensation may occur, the process proceeds to step ST72, the air conditioner flag becomes ACONF = 1, the process proceeds to step ST11, and the air conditioner is activated again. If it is determined in step ST71 that there is no possibility of condensation, the process proceeds to step ST73, the air conditioner flag becomes ACONF = 0, and the condensation flag becomes DEWONF = 0 in step ST74. Then, the process proceeds to step ST82, and it is determined in step ST82 whether or not the air conditioner mounted on the vehicle is set for automatic operation. If the automatic operation is not set, the process proceeds to NO, and the determination result is “0” in step ST11, and the air conditioner is turned off. If it is confirmed in step ST82 that the automatic operation of the air conditioner has been set, the process proceeds to step ST10 where ACONF = 1, and the process proceeds to step ST11. Thereafter, the above operation is repeated.

  When the above steps are executed, if the dew condensation sensor has not detected the dew condensation state, when the occurrence of dew condensation is first estimated using the temperature difference, the room humidity, and the first dew condensation estimation condition, Operate the air conditioner for a predetermined time. Thereafter, the air conditioner is operated for a predetermined time when the occurrence of condensation is estimated using the temperature difference, the room humidity, and the second condensation estimation condition. Thereafter, the operation of adjusting the humidity in the room is realized by alternately using the first dew condensation estimation condition and the second dew condensation estimation condition.

It is a figure which shows the arrangement | positioning of the sensor of the apparatus which implements the humidity adjustment method in the vehicle interior of this invention, and the structure of an apparatus. It is a block diagram which shows the circuit structure of FIG. 2 is a flowchart showing a software algorithm used when the method of the present invention is implemented using a central processing unit composed of a microcomputer on the premise of the configuration of FIG. 1. It is the graph which showed the relationship between vehicle interior temperature and vehicle interior temperature from which window glass begins to condense according to the temperature of window glass. It is the graph which showed the relationship between the temperature difference of vehicle interior temperature and vehicle exterior temperature, and the vehicle interior temperature from which a window glass begins to condense according to the temperature of a window glass.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Room 3 Condensation sensor unit 4 Humidity sensor unit 5 Windshield 6 Condensation sensor output processing circuit 7 2nd temperature sensor output circuit 8 Temperature / humidity sensor output circuit 9 Temperature sensor output circuit 10 Control circuit 11 Air conditioner 12 Central calculation Processing equipment

Claims (6)

A first temperature sensor for measuring an outside temperature of the vehicle or a glass; a second temperature sensor for measuring a temperature corresponding to a room temperature of the vehicle; and a condensation for detecting a dew condensation state on the inner surface of the glass. A sensor and a humidity sensor for measuring the indoor humidity of the vehicle are prepared. Based on outputs of the first and second temperature sensors, the dew condensation sensor, and the humidity sensor, an air conditioner mounted on the vehicle is provided. A humidity adjustment method for a vehicle interior that adjusts humidity in the room by controlling operation,
The first dew condensation estimation condition used to estimate that dew condensation occurs based on the relationship between the temperature difference between the outside temperature of the vehicle and the room temperature and the room humidity when the inner surface of the glass is dewed in advance. And
A second dew condensation estimation condition used to estimate that the dew condensation occurs before the first dew condensation estimation condition is satisfied;
When the dew condensation sensor detects the dew condensation state, the air conditioner is operated,
When the dew condensation sensor has not detected the dew condensation state, the air conditioner is first set when the occurrence of dew condensation is estimated using the temperature difference, the indoor humidity, and the first dew condensation estimation condition. Operate,
Thereafter, the occurrence of condensation is estimated using the temperature difference, the indoor humidity, and the second condensation estimation condition, and the air conditioner is operated,
Thereafter, the humidity adjustment method in the vehicle interior, wherein the humidity in the room is adjusted by alternately using the first condensation estimation condition and the second condensation estimation condition.   The method for adjusting humidity in a vehicle compartment according to claim 1, wherein the second temperature sensor is disposed in the vicinity of the inner surface of the glass, and the humidity sensor is disposed in the vicinity of the inner surface of the glass. The first dew condensation estimation condition is that the indoor humidity is H, the temperature difference is ΔT, and K1 to K4 are coefficients.
H> K1 · ΔT ³ + K2 · ΔT ² + K3 · ΔT + K4
Based on the formula of
The second dew condensation estimation condition is defined such that H in the equation is H-α and ΔT is ΔT + β (where α and β are predetermined correction constants),
The difference between the indoor humidity conditions satisfying the dew condensation condition is 3% or more when α and β are used when the first dew condensation estimation condition is used and when the second dew condensation estimation condition is used. A method for adjusting humidity in a vehicle compartment, characterized in that:   The K1 is a value between 0.026 and 0.027, the K2 is a value between 0.2 and 0.21, the K3 is a value between 6 and 7, and the K4 is 90. The humidity adjustment method for a vehicle compartment according to claim 3, wherein the humidity adjustment method is a value between ˜110. A first temperature sensor for measuring an outside temperature of the vehicle or a glass; a second temperature sensor for measuring a temperature corresponding to a room temperature of the vehicle; and a condensation for detecting a dew condensation state on the inner surface of the glass. An air conditioner mounted on the vehicle for humidity adjustment based on outputs of the sensor, a humidity sensor for measuring indoor humidity of the vehicle, the first and second temperature sensors, the dew condensation sensor, and the humidity sensor. A vehicle driving signal generator for outputting a driving signal for outputting a command for forcibly operating the vehicle, and adjusting the humidity in the vehicle room by controlling the operation of the air conditioner. A device,
The signal generator is used to estimate that condensation occurs based on a relationship between a temperature difference between the outside temperature of the vehicle and the indoor temperature and the indoor humidity when the inner surface of the glass that has been obtained in advance is condensed. Storage means for preliminarily storing a first dew condensation estimation condition and a second dew condensation estimation condition used to estimate that the dew condensation occurs before the first dew condensation prevention condition is satisfied;
When the dew condensation sensor detects the dew condensation state, the drive signal for operating the air conditioner is output, and when the dew condensation sensor does not detect the dew condensation state, first, the temperature difference and When the occurrence of condensation is estimated using the indoor humidity and the first dew condensation estimation condition, the drive signal for operating the air conditioner is output, and then the temperature difference, the indoor humidity, and the second A drive signal for operating the air conditioner when the occurrence of dew condensation is estimated using the dew condensation estimation condition, and thereafter the first dew condensation estimation condition and the second dew condensation estimation condition are used alternately. And a drive signal generating means for outputting the drive signal for adjusting the humidity in the room.   The humidity adjusting device for a vehicle compartment according to claim 5, wherein the second temperature sensor is disposed in the vicinity of the inner surface of the glass as a set with the dew condensation sensor or the humidity sensor.

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