JPH0243768Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a demist control device for an automobile air conditioner.

[Conventional technology and its problems]

Fogged window glass is a major obstacle to safe driving of a car. As a means to eliminate fogging on the window glass, demisting control is performed in which a dew condensation sensor is closely attached to the windshield and the air conditioner is operated using a humidity detection signal from this.

However, since dew condensation sensors are generally composed of a moisture-sensitive resistive film, they have a characteristic (temperature characteristic) in which the resistance value changes depending on temperature conditions, as shown in Figure 3. , even if the humidity is the same, the resistance value will fluctuate if the temperature is different, so that the window glass may not be detected as foggy even though it is actually foggy, or conversely, it may be detected that the window glass is fogged even though it is not. It is detected that the demist is on, and proper demist control cannot be performed.

As a countermeasure for this, in Japanese Patent Application Laid-Open No. 59-75853,
It has been proposed to install a thermistor near the dew condensation sensor, and use this thermistor to detect the surface temperature of the dew condensation sensor itself to correct the humidity calculation on the surface of the window glass.

However, this method uses a thermistor and mounts it close to the dew condensation sensor on the same board, which increases the space for the thermistor and the number of conductors, which increases the size of the case in which the sensor is built and complicates the manufacturing process. Not only did this lead to increased costs, but the increased heat capacity of the case also led to other problems, such as the responsiveness, which is important for a sensor, tending to drop.

[Means for solving problems]

The present invention attempts to solve the above-mentioned problems, and its purpose is to perform anti-fogging with good responsiveness in accordance with actual conditions without complicating or increasing the size of the dew condensation sensor. An object of the present invention is to provide a demist control device for an automobile air conditioner that can perform the following functions.

To achieve this objective, the present invention utilizes the temperature detection means incorporated in the control unit of the automobile air conditioner, in particular the inker sensor and the outside temperature sensor, to perform temperature correction of the dew condensation sensor, and based on the temperature correction of the dew condensation sensor. It is designed to operate.

In other words, the present invention includes an air conditioner having a dehumidifying mechanism, a dew condensation sensor attached to the inner surface of a window glass, a humidity level calculating means for calculating humidity from the output of the dew condensation sensor, and a humidity level calculation means for calculating humidity from the output of an inker sensor and an outside temperature sensor. means for calculating the inner surface temperature; correction means for correcting the resistance level of the condensation sensor from the outputs of both the humidity level calculating means and the window glass inner surface temperature calculating means to calculate the actual humidity inside the window glass; The present invention is characterized by comprising a determining means for determining the state of dew condensation from the actual humidity on the inner surface of the window glass.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 1 and 2 show an example of a demist control device for an automobile air conditioner according to the present invention.
11 is a blower, 12 is an evaporator, 13 is a heater core, 14 is an air mix damper, 15 is an outlet switching damper, and 16 is a compressor.

In order to control these devices, an inker sensor 1 is installed inside the vehicle interior A, an outside temperature sensor 2 is installed outside the vehicle interior, a solar radiation sensor 3 is installed above the dash panel, and a duct sensor 4 is installed downstream of the evaporator. Each of these sensors 1, 2, 3,
The signal No. 4 is input to the auto control unit 6 via an A/D converter (not shown), which calculates the necessary blowout temperature and controls the switching dampers 10, 1.
5, a signal is output to each actuator of the blower 11, evaporator 12, heater core 13, and air mix door 14 to perform air conditioning control.

5 is a dew condensation sensor, similar to known ones,
A resistor is printed on a circuit board and housed in a case. It is attached tightly to the inner surface of the window glass 7 using adhesive tape, etc., and detects the humidity near the window glass as a change in resistance value, which is input to the auto control unit 6. I'm starting to do that.

Conventionally, the presence or absence of condensation is determined by comparing the detected resistance value of the dew condensation sensor 5 with a level stored in advance in the form of a map in the auto control unit 6.
Based on this, the dehumidification mechanism was controlled. The feature of the present invention is that the inker sensor 1 and the outside temperature sensor 2 are not only used for air conditioning control, but also
It is used as a temperature correction means for the dew condensation sensor 5. That is, as schematically shown in FIG. 1, an air conditioning control section 60 and a dehumidification control section 61 are provided in the auto control unit 6 in a programmatic manner.
The output signal of the dew condensation sensor 5 is input to the dew condensation sensor 5, and each output signal of the inker sensor 1 and the outside temperature sensor 2 is also input to the dew condensation sensor 6, and the dew condensation determination is made after electrically applying temperature correction to the dew condensation sensor 6. It is configured as follows.

If such a configuration is adopted, inker sensor 1,
Signals from the outside air temperature sensor 2, solar radiation sensor 3, and duct sensor 4 are input to the air conditioning control unit 60, and the air conditioning control conditions are calculated and stored.At the same time, the dehumidification control unit 61 calculates the indoor temperature and outside air temperature that have been branched in. The window glass inner surface temperature is calculated from each signal, and this window glass inner surface temperature signal and the humidity level signal (resistance value level) detected by the dew condensation sensor 5 are further combined to form resistance value-temperature data as shown in FIG. The detected resistance level is corrected to the resistance level at a temperature (for example, 10° C.) corresponding to the actual inner surface temperature of the window glass. Then, when the corrected resistance value level, and therefore the actual humidity level on the inner surface of the window glass, exceeds a predetermined value, the dehumidification control unit 61 issues an activation signal to the dehumidification device, and dehumidification is performed.

FIG. 1a mechanically shows the explanation of the dehumidification control section 61, in which a humidity level calculation means 61 calculates the humidity level from the output of the dew condensation sensor 5.
0, and means 611 for calculating the inner surface temperature of the window glass from the outputs of the inker sensor 1 and the outside air temperature sensor 2.
and a correction means 612 which derives and compares the outputs of both the humidity level calculation means 610 and the window glass inner surface temperature calculation means 611, corrects the detected resistance level of the dew condensation sensor 5, and calculates the actual humidity inside the window glass.
and a determining means 613 for determining the dew condensation state from the window glass inner surface actual humidity signal obtained by correction.

Note that the dehumidification device is similar to a known one, and includes a compressor 16 that supplies refrigerant to each cooling system device of the air conditioner, such as the evaporator 12, an outlet switching damper 15, and an inside/outside air switching damper 10.
etc. are used selectively.

[Effect of idea]

According to the present invention described above, an air conditioner having a dehumidification mechanism, a dew condensation sensor attached to the inner surface of a window glass, a humidity level calculation means for calculating humidity from the output of the dew condensation sensor, and outputs of an inker sensor and an outside temperature sensor are provided. means for calculating the inner surface temperature of the window glass; correction means for calculating the actual humidity inside the window glass by correcting the resistance level of the condensation sensor from both outputs of the humidity level calculation means and the inner surface temperature of the window glass; The control unit is equipped with a determination means for determining the state of dew condensation from the actual humidity inside the window glass obtained by Since the processing is carried out internally, it is only necessary to increase the number of input ports of the control unit, and a thermistor for detecting the surface temperature of the dew condensation sensor is not required. This eliminates the complexity of sensor production associated with thermistor installation, which reduces costs, and also simplifies and downsizes the case that houses the condensation sensor, reducing heat capacity and improving responsiveness. The excellent effect of being able to perform quick and reliable demist control is obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of a demist control device according to the present invention, FIG. 1a is an explanatory diagram showing the dehumidification control section 61 in FIG. 1 as a block,
FIG. 2 is a schematic explanatory diagram of an automobile air conditioner incorporating the demist control device according to the present invention, and FIG. 3 is a graph showing the characteristics of a dew condensation sensor. DESCRIPTION OF SYMBOLS 1... Inker sensor, 2... Outside temperature sensor, 5... Condensation sensor, 6... Auto control unit, 60... Air conditioning control unit, 6
1...Dehumidification control section.

Claims (1)

[Scope of utility model registration request] An air conditioner having a dehumidification mechanism, a dew condensation sensor attached to the inner surface of a window glass, a humidity level calculating means for calculating humidity from the output of the dew condensation sensor, and a temperature of the inner surface of the window glass from the outputs of the inker sensor and the outside air temperature sensor. means for calculating the actual humidity inside the window glass by correcting the resistance level of the dew condensation sensor from the outputs of both the humidity level calculation means and the window glass inner surface temperature calculation means; 1. A demist control device for an automotive air conditioner, comprising: determination means for determining a dew condensation state based on humidity.