JP2017213971A - Vehicular air conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a window glass from misting even in a state where a humidity sensor is not compatible with variation in internal humidity of a cabin when controlling an inside/outside air switching damper based on the humidity sensor disposed in the cabin.SOLUTION: When it is detected that outside temperature is equal to or lower than prescribed temperature and engine water temperature is equal to or lower than a first threshold while an inside/outside air mixture mode is selected, a vehicular air conditioning device executes correction processing so as to increase an outside air introduction amount.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle air conditioner mounted on, for example, an automobile, and particularly relates to a technical field in which air outside a vehicle interior and air inside the vehicle interior are simultaneously introduced as conditioned air to adjust the temperature.

  In general, an air conditioner for a vehicle is provided with an inside / outside air switching device for selecting air inside the vehicle interior (inside air) and air outside the vehicle interior (outside air) and introducing it as air conditioning air. The inside / outside air switching device includes a blower casing in which an inside air introduction port for introducing inside air and an outside air introduction port for introducing outside air are formed. The outside air introduction port communicates with the outside of the passenger compartment through an opening formed in the cowl or the like in the vehicle body. An inside / outside air switching damper that opens and closes the inside air introduction port and the outside air introduction port is provided in the blower casing. The introduced air-conditioning air is temperature-adjusted by a cooling heat exchanger, a heating heat exchanger, etc., and then blown out from the selected outlet among the defroster outlet, vent outlet, and heat outlet to the passenger compartment. It is like that.

  The vehicle air conditioners disclosed in Patent Documents 1 and 2 control the inside / outside air switching damper to adjust the temperature by introducing the inside air, and then after adjusting the temperature by introducing the outside air and adjusting the temperature by introducing the outside air. The outside air introduction mode to be supplied to the vehicle interior, and after adjusting the temperature by introducing both the inside air and the outside air, can be switched to three intake modes of the inside and outside air mixing mode to be supplied to the vehicle interior. Yes. Auto air conditioner control that automatically sets the intake mode, blowing mode, air volume, blowing temperature, etc. based on the conditions inside and outside the cabin (interior temperature, outside temperature, solar radiation) and the set temperature set by the passenger Is called.

  In Patent Document 1, the introduction ratio between outside air and inside air can be changed in the inside / outside air mixing mode, and the inside air circulation mode is set when the humidity inside the vehicle measured by the humidity sensor is 20% or less, and the outside air introduction mode when the humidity is 50%. It is said.

  In Patent Document 2, a determination unit that determines whether or not the window glass is easily fogged is provided. When the determination unit determines that the window glass is not easily fogged, at least the inside air is circulated and the determination unit determines that the window glass is likely to be fogged. As an outside air introduction mode, the window glass is prevented from being fogged. Furthermore, a control mode for gradually increasing the inside air circulation amount in the inside / outside air mixing mode, a control mode for maintaining the ratio between the inside air and the outside air, and a control mode for gradually increasing the amount of outside air introduced in the inside / outside air mixing mode are provided. The control mode is selected based on the ease of fogging of the window glass. There is an advantage that the amount of energy consumed for heating can be reduced by increasing the inside air circulation amount in a range where the window glass is not fogged, thereby reducing the ventilation amount.

  Patent Document 3 also controls the inside / outside air switching damper based on a humidity sensor, as in Patent Document 1.

JP-B-1-27891 Japanese Patent No. 5152355 Japanese Utility Model Publication No. 56-70311

  By the way, as described above, the ease of fogging of the window glass of the vehicle is detected by the humidity sensor, and when the window glass is easily fogged based on the detection result, the inside / outside air switching damper is operated in the direction in which the outside air introduction amount increases. When the window glass is not easily fogged, it is considered that accurate control can be performed by operating the inside / outside air switching damper in a direction in which the inside air circulation amount increases.

  However, in general, since the humidity sensor disposed in the vehicle interior is covered with a cover or the like, it is difficult to detect the actual humidity in the vehicle interior in real time. For example, when the number of passengers is one, the increase in humidity in the passenger compartment due to exhalation or sweat evaporation by the passenger is moderate, and even if the humidity sensor is covered with a cover, the actual humidity change in the passenger compartment However, if the number of passengers is 5, etc., the humidity in the passenger compartment suddenly rises until the actual humidity change in the passenger compartment is detected by the humidity sensor. A time lag occurs. Therefore, although the actual humidity in the passenger compartment is a humidity at which the window glass is easily fogged, the amount of inside air circulation remains large, and the window glass may be fogged.

  The present invention has been made in view of such a point, and an object of the present invention is to change the humidity in the vehicle interior when the inside / outside air switching damper is controlled based on a humidity sensor disposed in the vehicle interior. This is to prevent the window glass from being fogged even in a situation where the humidity sensor cannot cope with this.

  In order to achieve the above object, according to the present invention, it is possible to estimate whether or not the passenger compartment is in a humidity state in which it is easily cloudy.

The first invention is
A blower casing formed with an inside air introduction port that introduces air in the vehicle interior and circulates it into the vehicle interior, and an outside air introduction port that introduces air outside the vehicle compartment;
An inside / outside air switching damper that is provided in the blower casing and opens and closes the inside air inlet and the outside air inlet;
Inside / outside air switching damper driving means for driving the inside / outside air switching damper;
A humidity detection sensor disposed in the vehicle interior for detecting the humidity in the vicinity of the window glass in the vehicle interior;
A controller for controlling the inside / outside air switching damper driving means,
The control device controls the inside / outside air switching damper driving means to operate the inside / outside air switching damper in a direction in which the outside air introduction amount increases when the window glass is easily fogged based on the detection result of the humidity detection sensor. On the other hand, when the window glass is difficult to be fogged, the inside / outside air mixing mode for controlling the inside / outside air switching damper driving means to operate the inside / outside air switching damper in the direction in which the inside air circulation amount increases can be selected. In vehicle air conditioners,
The vehicle air conditioner includes an outside air temperature detecting means for detecting an outside air temperature, and an engine water temperature detecting means for detecting an engine water temperature of the vehicle,
When the inside / outside air mixing mode is selected, the control device is configured such that the outside air temperature is not more than a predetermined temperature by the outside air temperature detecting means and the engine water temperature is not more than a first threshold value by the engine water temperature detecting means. Is detected, correction processing is performed so as to increase the amount of outside air introduced.

  That is, when the outside air temperature is a predetermined temperature, for example, 10 ° C. or less, the window glass is easily fogged, and at such a low outside air temperature, the engine water temperature is lower than the first threshold value and in a low temperature state. In some cases, the elapsed time after the start of operation of the vehicle is short, and the temperature of the heating heat source is not sufficiently increased. In this invention, when the outside air temperature is low and the engine water temperature is low, the correction processing is performed so as to increase the outside air introduction amount. Therefore, for example, even if there is a large number of passengers and the humidity in the passenger compartment suddenly rises and the actual humidity change in the passenger compartment is detected by the humidity sensor, a time lag occurs and the window glass is easily fogged. It becomes possible to cope with by increasing the amount of introduction.

According to a second invention, in the first invention,
When the control device detects that the dew point temperature calculated based on the detection result of the humidity detection sensor is equal to or lower than the second threshold value when the inside / outside air mixing mode is selected, The correction process is performed so that the introduction amount increases.

  According to this configuration, the dew point temperature in the vicinity of the window glass can be calculated based on the detection result of the humidity detection sensor. When the calculated dew point temperature is a low dew point temperature equal to or lower than the second threshold value, it can be estimated that the window glass is likely to be fogged. In this case, the amount of outside air introduced can be increased.

According to a third invention, in the first or second invention,
The control device is configured to increase the outside air introduction amount as the outside air temperature detected by the outside air temperature detecting means decreases when performing the correction process.

  That is, when the outside air temperature is lowered, the window glass is easily fogged. However, in the present invention, the outside air introduction amount is increased as the outside air temperature is lowered, so that the window glass is hardly fogged.

According to a fourth invention, in any one of the first to third inventions,
The control device is configured to prohibit the correction processing when the engine water temperature detecting means detects that the engine water temperature is equal to or higher than a predetermined temperature.

  That is, when the engine water temperature is high, it is possible that the temperature of the heating heat source can be made sufficiently high, so that the window glass is hardly fogged. In this case, by prohibiting the correction process so that the outside air introduction amount does not increase, the inside air circulation amount is sufficiently secured.

According to a fifth invention, in any one of the first to fourth inventions,
The said control apparatus is comprised so that the said 1st threshold value may be made high, so that the outside temperature detected by the said outside temperature detection means becomes high.

A sixth invention is the invention according to any one of the first to fifth aspects,
The control device is configured to lower the second threshold as the outside air temperature detected by the outside air temperature detecting means decreases.

  According to the first aspect of the invention, the correction process is performed so that the outside air introduction amount increases when the outside air temperature is low and the engine water temperature is low. Therefore, for example, even if there is a time lag before the actual humidity change in the passenger compartment is detected by the humidity sensor due to a large number of passengers and the humidity in the passenger compartment suddenly rises, Since the amount of introduction increases, the window glass can be made difficult to fog.

  According to the second invention, since the outside air introduction amount can be increased when the dew point temperature calculated based on the detection result of the humidity detection sensor is low, the correction process can be performed accurately.

  According to the third aspect of the invention, the amount of outside air introduced can be increased as the outside air temperature decreases, so that the window glass can be made more difficult to fog.

  According to the fourth invention, when the engine water temperature is equal to or higher than the predetermined temperature, it is possible to prohibit the correction process and prevent the outside air introduction amount from increasing. Thereby, since the amount of inside air circulation can be secured sufficiently, the energy consumption required for heating can be reduced.

  According to the fifth aspect of the invention, the window glass can be made more difficult to fog by increasing the first threshold value as the outside air temperature increases.

  According to the sixth invention, the window glass can be made more difficult to fog by lowering the second threshold value as the outside air temperature becomes lower.

It is a figure showing the schematic structure of the air-conditioner for vehicles concerning an embodiment. It is a block diagram of a vehicle air conditioner. It is a flowchart which shows the control procedure by a control apparatus. It is a flowchart which shows an intake control procedure. 6 is a graph for calculating a threshold value A. 4 is a graph for calculating a threshold value B. It is a graph for calculating a dew point temperature correction value.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a schematic configuration diagram of a vehicle air conditioner 1 according to an embodiment of the present invention. This vehicle air conditioner 1 is mounted on a vehicle such as an automobile, for example, and after adjusting the temperature by introducing one or both of air in the vehicle interior (inside air) and air outside the vehicle interior (outside air), It is comprised so that it may supply to each part of a vehicle interior. Although not shown, a vehicle interior of the vehicle is provided with a front seat including a driver seat and a passenger seat, and a rear seat disposed behind the front seat.

  The vehicle air conditioner 1 includes an air conditioning casing 10 and a control device (shown in FIG. 2) 30. The air conditioning casing 10 is accommodated, for example, inside an instrument panel (not shown) disposed at the front end of the passenger compartment. The air conditioning casing 10 includes a blower casing 11, a temperature adjusting unit 12, and a blowing direction switching unit 13 in order from the upstream side to the downstream side in the air flow direction. The blower casing 11 is formed with an outside air introduction port 11a and an inside air introduction port 11b. The outside air introduction port 11a communicates with the outside of the passenger compartment through, for example, an intake duct (not shown), and introduces air outside the passenger compartment (outside air). The inside air introduction port 11b is opened inside the instrument panel, and introduces air (inside air) in the passenger compartment to circulate in the passenger compartment. The amount of outside air introduced from the outside air introduction port 11a is the outside air introduction amount. The amount of the inside air introduced from the inside air introduction port 11b becomes the inside air circulation amount.

  Inside the blower casing 11, an inside / outside air switching damper 11c for opening and closing the outside air introduction port 11a and the inside air introduction port 11b is disposed. The inside / outside air switching damper 11 c can be constituted by, for example, a plate-like member, and is supported so as to be rotatable with respect to the side wall of the blower casing 11. The inside / outside air switching damper 11c is driven to have an arbitrary rotation angle by an inside / outside air switching actuator (inside / outside air switching damper driving means) 11d. Thereby, the intake mode is switched. The inside / outside air switching actuator 11d is controlled by the control device 30 as described later.

  For example, as shown by a solid line in FIG. 1, when the outside air introduction port 11a is fully closed and the inside / outside air switching damper 11c is rotated until the inside air introduction port 11b is fully opened, the intake mode becomes the inside air circulation mode. The opening degree of the inside / outside air switching damper 11c at this time is 100%. On the other hand, when the outside air introduction port 11a is fully opened and the inside / outside air switching damper 11c is rotated until the inside air introduction port 11b is fully closed as indicated by a virtual line in FIG. 1, the intake mode becomes the outside air introduction mode. . The opening degree of the inside / outside air switching damper 11c at this time is 0%. When the opening degree of the inside / outside air switching damper 11c is between 1% and 99%, both the outside air introduction port 11a and the inside air introduction port 11b are opened, and both the inside air and the outside air are introduced into the temperature control unit 12. Is done. This intake mode is the inside / outside air mixing mode. In the inside / outside air mixing mode, the introduction ratio between the inside air and the outside air is changed according to the opening degree of the inside / outside air switching damper 11c, and thereby the outside air introduction amount and the inside air circulation amount change. Details of the intake mode switching control will be described later.

  Further, since both the outside air introduction port 11a and the inside air introduction port 11b are in the open state in the inside / outside air mixing mode, for example, if the running wind is strong, the running wind enters the blower casing 11 from the outside air introduction port 11a. A part of the air may flow into the passenger compartment from the inside air inlet 11b. At this time, for example, if it is snowing, it is conceivable that snow riding on the traveling wind enters the blower casing 11 from the outside air introduction port 11a and enters the vehicle interior from the inside air introduction port 11b, but this embodiment will be described later. In step SB11 of the flowchart shown in FIG. 4, the entry of snow into the passenger compartment is suppressed.

  As shown in FIG. 1, the blower casing 11 is provided with a blower 15. The blower 15 includes a fan 15a and a blower motor 15b that drives the fan 15a. When the fan 15a rotates, at least one of the inside air and the outside air is introduced into the blower casing 11, and then blown to the temperature adjusting unit 12 provided on the downstream side of the blower casing 11. The blower motor 15b is configured to be able to adjust the number of revolutions per unit time by changing the applied voltage. The amount of blown air varies depending on the rotational speed of the blower motor 15b. The blower motor 15 b is controlled by the control device 30.

  The temperature adjustment unit 12 is a part for adjusting the temperature of the air-conditioning air introduced from the blower casing 11. Inside the temperature control unit 12, a cooling heat exchanger 16, a heating heat exchanger 17, and an air mix door 18 are disposed. That is, a cold air passage R1 is formed in the temperature adjusting unit 12 on the upstream side in the air flow direction, and the cooling heat exchanger 16 is accommodated in the cold air passage R1. Further, the downstream side of the cold air passage R1 is branched into a hot air passage R2 and a bypass passage R3, and the heating heat exchanger 17 is accommodated in the hot air passage R2.

  The cooling heat exchanger 16 can be constituted by, for example, a refrigerant evaporator of a heat pump device or the like, but is not limited thereto, and may be anything that can cool air. Moreover, the heat exchanger 17 for heating can be comprised, for example by the heater core etc. which are supplied with the cooling water of the engine (not shown) mounted in the engine room of the vehicle, However, it is not restricted to this Any device that can heat air, such as an electric heater, may be used. An electric heater can be added as an auxiliary heat source.

  The air mix door 18 is disposed between the cooling heat exchanger 16 and the heating heat exchanger 17, and opens and closes the upstream end of the hot air passage R2 and the upstream end of the bypass passage R3. The air mix door 18 can be comprised, for example with a plate-shaped member, and is supported so that rotation with respect to the side wall of the temperature control part 12 is possible. The air mix door 18 is driven by an air mix actuator 18a so as to have an arbitrary rotation angle. The air mix actuator 18 a is controlled by the control device 30.

  When the air mix door 18 fully opens the upstream end of the hot air passage R2 and fully closes the upstream end of the bypass passage R3, the entire amount of the cold air generated in the cold air passage R1 flows into the hot air passage R2 and heats it. Therefore, warm air flows into the blowing direction switching unit 13. On the other hand, when the air mix door 18 fully closes the upstream end of the hot air passage R2 and fully opens the upstream end of the bypass passage R3, the entire amount of cold air generated in the cold air passage R1 flows into the bypass passage R3. Cold air flows into the blowing direction switching unit 13. When the air mix door 18 is in a rotational position that opens the upstream end of the hot air passage R2 and the upstream end of the bypass passage R3, the cold air and the hot air flow into the blowing direction switching unit 13 in a mixed state. The amount of cool air and the amount of warm air flowing into the blowing direction switching unit 13 are changed depending on the rotation position of the air mix door 18, and conditioned air having a desired temperature is generated. The air mix door 18 is not limited to the plate-shaped door described above, and any configuration may be used as long as it can change the amount of cold air and the amount of hot air. For example, a rotary door, a film door, a louver damper, or the like may be used. Moreover, the structure of temperature control may not be the above-described structure, and may be a structure that can change the amount of cold air and the amount of hot air.

  The blowing direction switching part 13 is a part for supplying the conditioned air whose temperature is adjusted by the temperature adjusting part 12 to each part of the passenger compartment. In the blowing direction switching unit 13, a defroster outlet 21, a vent outlet 22, and a heat outlet 23 are formed. The defroster outlet 21 is connected to a defroster nozzle 24 formed on the instrument panel. The defroster outlet 21 is for supplying conditioned air to the vehicle interior surface of the front window glass (window glass) G. A defroster door 21 a for opening and closing the defroster outlet 21 is provided inside the defroster outlet 21.

  The vent outlet 22 is connected to a vent nozzle 25 formed on the instrument panel. The vent nozzle 25 is for supplying conditioned air to the upper body of the front seat occupant, and is provided at the center in the vehicle width direction of the instrument panel and at both the left and right sides. A vent door 22 a for opening and closing the vent air outlet 22 is provided inside the vent air outlet 22.

  The heat outlet 23 is connected to a heat duct 26 that extends to the vicinity of the passenger's feet. The heat duct 26 is for supplying conditioned air to the feet of passengers. Inside the heat outlet 23, a heat door 23a for opening and closing the heat outlet 23 is provided.

  The defroster door 21a, the vent door 22a, and the heat door 23a are driven by the blowing direction switching actuator 27 to open and close. The blowing direction switching actuator 2 is controlled by the control device 30. The defroster door 21a, the vent door 22a, and the heat door 23a are linked via a link (not shown). For example, the defroster mode and defroster in which the defroster door 21a is open and the vent door 22a and heat door 23a are closed. The vent mode in which the door 21a and the heat door 23a are closed and the vent door 22a is opened, the heat mode in which the defroster door 21a and the vent door 22a are closed and the heat door 23a is opened, the defroster door 21a and the vent door 22a are open Thus, among the plurality of blowing modes such as the differential vent mode in which the heat door 23a is in the closed state, the defroster door 21a and the heat door 23a in the open state, and the vent door 22a in the closed state, the mode is switched to an arbitrary blowing mode. That.

  As shown in FIG. 2, the vehicle air conditioner 1 includes an outside air temperature sensor (outside air temperature detecting means) 31, an inside air temperature sensor 32, a solar radiation amount sensor (sunlight amount detecting means) 33, a cooling water temperature sensor 34, an evaporator sensor 35, A front window temperature sensor 36, a front window vicinity temperature sensor 37, a front window vicinity humidity sensor 38, an operation switch 39, an occupant sensor 40, a vehicle speed sensor (vehicle speed detection means) 41, a wiper switch 42, and an engine water temperature sensor 43 are provided. These sensors 31 to 38, 40, 41, 43 are connected to the control device 30 and output signals to the control device 30. Further, the operation switch 39 is connected to the control device 30 so that the control device 30 can detect the operation state by the occupant. The wiper switch 42 is connected to the control device 30.

  The outside air temperature sensor 31 is disposed, for example, at the front or side of the vehicle outside the passenger compartment, and detects the air temperature (outside air temperature) around the vehicle. The inside air temperature sensor 32 is disposed, for example, in the vicinity of an instrument panel in the passenger compartment, and detects the air temperature (inside air temperature) in the passenger compartment. The solar radiation amount sensor 33 is disposed, for example, in the vicinity of an instrument panel in the passenger compartment, and detects the amount of solar radiation irradiated to the passenger compartment.

  The inside air temperature sensor 32, the outside air temperature sensor 31, and the solar radiation amount sensor 33 can detect information related to cooling that is felt by the occupant. In other words, the inside air temperature output from the inside air temperature sensor 32 is substantially equal to the occupant's atmosphere temperature. A high inside air temperature makes the occupant feel warm and a low inside air temperature makes the occupant feel cold. . Further, when the outside air temperature output from the outside air temperature sensor 31 is high, the passenger feels warm, and when the outside air temperature is low, the passenger feels cold. Further, when the amount of solar radiation output from the solar radiation amount sensor 33 is large, the passenger feels warm, and when the amount of solar radiation is small, the passenger feels cold.

  The cooling water temperature sensor 34 is engine water temperature detection means for detecting the temperature of the cooling water (engine water temperature) of the engine mounted on the vehicle. With this cooling water temperature sensor 34, the temperature of the engine cooling water flowing into the heating heat exchanger 17 can be estimated. Further, the cooling water temperature sensor 34 can estimate the warm-up state of the engine and obtain the temperature of the heating heat source. The evaporator sensor 35 is disposed downstream of the cooling heat exchanger 16 in the air flow direction, and detects the surface temperature of the cooling heat exchanger 16.

  The front window temperature sensor 36 is disposed on the vehicle interior surface of the front window glass G, and detects the temperature of the vehicle interior surface of the front window glass G. The front window vicinity temperature sensor 37 is disposed away from the vehicle interior surface of the front window glass G and in the vicinity of the inner surface thereof, and detects the temperature of the front window glass G in the vicinity of the vehicle interior surface. A front window vicinity humidity sensor (humidity detection sensor) 38 is disposed away from the vehicle interior surface of the front window glass G and in the vicinity of the inner surface thereof, and detects the humidity of the front window glass G near the vehicle interior surface. Is.

  The operation switch 39 is disposed, for example, on an instrument panel or the like. For example, an ON / OFF switch for the air conditioner 1, an air volume switch for increasing or decreasing the air flow, a temperature setting switch for setting the temperature of the passenger compartment, It is composed of an inside / outside air switching switch for switching between the inside air circulation, outside air introduction and inside / outside air mixing modes, an auto switch for selecting whether or not to perform auto air conditioner control, a blowing mode switching switch for switching the blowing direction, a defroster switch, and the like.

  The occupant sensor 40 can detect whether an occupant is seated in the front seat and can also detect whether an occupant is seated in the rear seat. Specifically, for example, a pressure sensor is incorporated in each of the seat cushion portions of the front seat and the rear seat, and it is possible to detect whether or not an occupant is seated by the pressure sensor. In addition, since a sensor for detecting whether or not the front and rear seat belts are in the mounted state is provided in a general vehicle, if the seat belt is in the mounted state using this sensor, the occupant is seated. Can be detected. The vehicle speed sensor 41 can detect the speed of the vehicle, and conventionally known sensors can be used. The signal output from the passenger sensor 40 may or may not be used for the control according to the present embodiment.

  The wiper switch (wiper operating state detecting means) 42 is for operating a wiper provided in the vehicle, and has at least an ON position for operating the wiper and an OFF position for stopping the wiper. doing. In the ON position, the operation speed of the wiper can be switched between high speed, medium speed, and low speed, and intermittent operation can be performed. Since the wiper switch 42 is connected to the control device 30, the control device 30 can detect the operating state of the vehicle wiper by the wiper switch 42.

  Based on the signals (output values) output from the sensors 31 to 38, 40, 41, and 43 and the operation states of the operation switch 39 and the wiper switch 42, the control device 30 performs the inside / outside air switching actuator 11d, the air mix The actuator 18a, the blowing direction switching actuator 27, and the blower motor 15b are controlled. That is, when the automatic air conditioner control is selected by the auto switch of the operation switch 39, the temperature outside the passenger compartment, the temperature inside the passenger compartment, the amount of solar radiation, the engine coolant temperature, the surface temperature of the cooling heat exchanger 16, the set temperature. Based on the above, the target blowing temperature of the conditioned air supplied to the vehicle interior is determined, the opening degree of the air mix door 18 is calculated so as to be the target blowing temperature, and the air mixing door 18 becomes this opening degree. Thus, the air mix actuator 18a is controlled to rotate the air mix door 18. Thereby, the temperature of the conditioned air becomes the target blowing temperature.

  Further, the control device 30 controls the blowing direction switching actuator 27 so that the blowing mode is mainly the vent mode during cooling, and controls the blowing direction switching actuator 27 so that the blowing mode is mainly set to the heat mode during heating. . In the case of weakness even during cooling or heating, the blowing direction switching actuator 27 is controlled so as to be in the bi-level mode or the defvent mode. Further, when the defroster switch included in the operation switch 39 is turned on, the blow direction switching actuator 27 is controlled so that the blow mode becomes the defrost mode.

  For example, when heating is performed with a vehicle that has been left for a long time in winter, or when cooling is performed with a vehicle that has been left for a long time in summer, the difference between the target blowing temperature and the inside air temperature becomes large. In such a case, the control device 30 controls the blower motor 15b so as to increase the air volume, but the occupant can also operate the air volume selector switch to obtain the desired air volume. In the automatic air conditioner control, the blower motor 15b is controlled so that the air volume decreases as the difference between the target blowing temperature and the inside air temperature decreases. The blower motor 15b is controlled by changing the applied voltage. However, the present invention is not limited to this, and it is sufficient that the number of rotations of the blower motor 15b can be changed.

  The amount of air blown to the upper body of the occupant can be detected by the control of the blower motor 15b and the control of switching the blowing mode by the control device 30. That is, when the blowing mode is the vent mode, the conditioned air is mainly blown to the upper body of the occupant. By detecting the voltage applied to the blower motor 15b in the vent mode, the occupant's upper body is detected. The amount of blown air can be detected. Further, in the heat mode, the amount of air blown to the occupant's upper body as a whole is smaller than that in the vent mode, and this can also be detected by the control device 30.

  Further, the control device 3 controls the inside / outside air switching actuator 24 according to the procedure of the flowchart shown in FIG. The control of the inside / outside air switching actuator 24 is performed at a predetermined timing when the ignition switch of the vehicle is ON and the air conditioner 1 for the vehicle is turned ON and the control device 3 determines that heating is necessary. It has been repeated. During cooling, the inside / outside air switching actuator 24 is basically controlled so as to be in a mode selected by the occupant (outside air introduction mode or inside air circulation mode).

  In step SA1 after the start, the output values of the sensors 31 to 38, 40, 41, and 43 are read, and the operation states of the operation switch 39 and the wiper switch 42 are read. Each sensor 31 to 38, 40, 41, 43 continuously detects and outputs each value when the ignition switch is turned on from the OFF state and thereafter.

  In step SA2 following step SA1, the dew point temperature is calculated. The dew point temperature is the temperature near the vehicle interior surface of the front window glass G output from the front window vicinity temperature sensor 36 and the humidity near the vehicle interior surface of the front window glass G output from the front window vicinity humidity sensor 38. Obtained on the basis. The dew point temperature is continuously calculated when and after the ignition switch is turned on from the OFF state.

  In step SA3, it is determined whether or not the outside air temperature detected by the outside air temperature sensor 31 is in the range of −15 ° C. or higher and 10 ° C. or lower (predetermined temperature or lower). That is, when the outside air temperature is less than −15 ° C. or higher than 10 ° C., steps SA4 to SA6 are skipped and the process proceeds to step SA7, so that the dew point temperature correction process in step SA6 is prohibited. become. The control in step SA7 will be described later. That is, when it is detected that the outside air temperature is equal to or lower than the predetermined temperature, the process proceeds to Step SA4.

  In Step SA4, it is determined whether or not the engine water temperature is equal to or lower than a predetermined threshold A when the ignition switch of the vehicle is turned on (IG ON) from the OFF (IG OFF) state. That is, the engine water temperature when the ignition switch in the OFF state is turned on is obtained from the cooling water temperature sensor 34, and is stored in the control device 30, and the engine water temperature stored in the control device 30 is stored. Based on the above, the above determination is made in step SA4.

  The predetermined threshold A in step SA4 is the first threshold, and is obtained based on the graph shown in FIG. The horizontal axis of the graph of FIG. 5 is the outside air temperature (° C.) detected by the outside air temperature sensor 31, and the vertical axis is the threshold value A (° C.). When the outside air temperature is −15 ° C., the threshold A is 5 ° C., and when the outside air temperature is 10 ° C., the threshold A is 20 ° C. When the outside air temperature is in the range of −15 ° C. to 10 ° C., the threshold A increases in proportion to the increase in the outside air temperature. That is, the control device 30 is configured to increase the threshold value A as the outside air temperature detected by the outside air temperature sensor 31 increases. In the graph of FIG. 5, the outside air temperature and the threshold value A are exemplifications, and specific temperatures can be changed within a range in which the effect of the present embodiment is exerted.

  If it is determined YES in step SA4 of the flowchart shown in FIG. 3 and the engine water temperature when the ignition switch in the OFF state is turned on is not more than the predetermined threshold A, the process proceeds to step SA5. If it is determined NO in step SA4 and the engine water temperature when the ignition switch in the OFF state is turned on is higher than the predetermined threshold A, the process proceeds to step SA7. Therefore, the dew point temperature correction process in step SA6 is performed. Will be banned.

  In step SA5, it is determined whether or not the dew point temperature when the ignition switch of the vehicle is turned on (IG ON) from the OFF (IG OFF) state is equal to or lower than a predetermined threshold B. That is, the dew point temperature calculated when the ignition switch in the OFF state is turned on is temporarily stored in the control device 30, and the above determination is made in step SA5 based on the dew point temperature stored in the control device 30. Do.

  The predetermined threshold value B in step SA5 is the second threshold value, and is obtained based on the graph shown in FIG. The horizontal axis of the graph of FIG. 6 is the outside air temperature (° C.) detected by the outside air temperature sensor 31, and the vertical axis is the threshold value B (° C.). When the outside air temperature is −15 ° C., the threshold value B is −16.5 ° C., and when the outside air temperature is 10 ° C., the threshold value B is 12.5 ° C. When the outside air temperature is in the range of −15 ° C. to 10 ° C., the threshold value B increases in proportion to the increase in the outside air temperature. That is, the control device 30 is configured to lower the threshold value B as the outside air temperature detected by the outside air temperature sensor 31 decreases. In the graph of FIG. 6, the outside air temperature and the threshold value B are exemplifications, and specific temperatures can be changed within a range where the effect of the present embodiment is exerted.

  If the dew point temperature when the ignition switch that is determined to be YES in step SA5 of the flowchart shown in FIG. If the dew point temperature when the ignition switch in the OFF state determined to be NO in step SA5 is turned on is higher than the predetermined threshold B, the process proceeds to step SA7, and therefore the dew point temperature correction process in step SA6 is performed. Will be banned.

  In step SA6, dew point temperature correction processing is performed. The dew point temperature correction process is a process of adding a dew point temperature correction value (° C.) to the dew point temperature calculated in step SA2. The dew point temperature correction value (° C.) is obtained based on the graph shown in FIG. The horizontal axis of the graph in FIG. 7 is the outside air temperature (° C.) detected by the outside air temperature sensor 31, and the vertical axis is the dew point temperature correction value (° C.). When the outside air temperature is -15 ° C, the dew point temperature correction value (° C) is -2 ° C, and when the outside air temperature is 10 ° C, the dew point temperature correction value (° C) is -1 ° C. When the outside air temperature is in the range of −15 ° C. to 10 ° C., the dew point temperature correction value (° C.) increases in proportion to the increase in the outside air temperature.

  Therefore, when it is determined as YES in step SA3, the outside air temperature is 10 ° C. or less, and the vehicle interior surface of the front window glass G is easily cloudy. If YES in step SA4, the engine water temperature when the ignition switch is turned on is equal to or lower than the threshold A. For this reason, the engine is not sufficiently warmed, the elapsed time after the start of operation of the vehicle is short, and the temperature of the heating heat source is not sufficiently increased. it is conceivable that. Further, when YES is determined in step SA5, the dew point temperature when the ignition switch is turned on is equal to or lower than the threshold value B, and the dew point temperature is low. It is thought that the surface is easily cloudy.

  If YES is determined in steps SA3 to SA5 and the process proceeds to step SA6, it means that the vehicle interior surface of the front windshield G is easily clouded. In this case, in step SA6, the graph of FIG. Since the dew point temperature correction value (° C.) obtained from the above is added to the dew point temperature (° C.), the dew point temperature after the correction processing is lowered.

  In step SA7, a target dew point temperature is calculated. The target dew point temperature is set to a temperature lower than the temperature of the vehicle interior surface of the front window glass G output from the front window temperature sensor 37. For example, when the temperature of the vehicle interior surface of the front window glass G is 10 ° C., a temperature lower by about 2 to 3 ° C. is set as the target dew point temperature. The target dew point temperature can be obtained according to a known method.

  In step SA8, intake control is performed. Specifically, as shown in the flowchart of FIG. 4, in step SB <b> 1, it is determined whether or not the automatic control is performed, that is, whether the automatic air conditioner control or the manual operation by the passenger is selected. Whether or not the auto air conditioner control is performed can be determined by whether or not the auto switch among the operation switches 39 is pressed. If NO is determined in step SB1 and the manual operation is selected instead of the automatic air conditioner control, the process proceeds to step SB2, and it is determined whether or not the intake mode is the outside air introduction mode. Since the inside / outside air mixing mode cannot be selected by manual operation, it is determined in step SB2 which mode is the outside air introduction mode or the inside air circulation mode.

  If it is determined as YES in step SB2 and it is in the outside air introduction mode, it means that the occupant has positively selected the outside air introduction mode, so that the routine proceeds to step SB3 and the target opening degree of the inside / outside air switching damper 11c. Is the outside air opening. The outside air introduction opening is an opening that fully opens the outside air introduction port 11a and fully closes the inside air introduction port 11b, and is 0%. On the other hand, if it is determined as NO in step SB2 and is in the inside air circulation mode, it means that the occupant is positively selecting the inside air circulation mode, so that the process proceeds to step SB4, where the inside / outside air switching damper 11c The target opening is the inside air circulation opening. The inside air circulation opening is an opening that fully closes the outside air introduction port 11a and fully opens the inside air introduction port 11b, and is 100%.

  If YES is determined in step SB1 and the air conditioner control is performed, the process proceeds to step SB5. In step SB5, when the correction process is not performed in step SA6 of the flowchart shown in FIG. 3, the dew point temperature calculated in step SA2 is used, and when the correction process is performed in step SA6, the dew point after the correction process is performed in step SA6. Use temperature. Then, the target opening degree (f) of the inside / outside air switching damper 11c is calculated so as to be the target dew point temperature calculated in step SA7.

  For example, when the dew point temperature is higher than the target dew point temperature in step SB5, the target opening degree (f) of the inside / outside air switching damper 11c is calculated so as to increase the outside air introduction amount, and the dew point temperature is lower than the target dew point temperature. In this case, the target opening degree (f) of the inside / outside air switching damper 11c is calculated so as to increase the inside air circulation amount. When the dew point temperature is higher than the target dew point temperature, the outside air introduction amount is increased as the difference becomes larger, and when the dew point temperature is lower than the target dew point temperature, the inside air circulation amount is increased as the difference becomes larger.

  That is, the control device 30 detects the easiness of fogging of the front window glass G based on the output value of the humidity sensor 38 near the front window, and basically, when the front window glass G is easily fogged based on the detection result. While the outside air introduction amount is increased, the inside air circulation amount is increased when the front window glass G is difficult to fog. Thus, in the automatic air conditioner control, basically, the inside / outside air mixing mode in which the outside air introduction amount and the inside air circulation amount are changed based on the ease of fogging of the front window glass G is selected.

  After calculating the target opening (f) of the inside / outside air switching damper 11c in step SB5, the process proceeds to step SB6, where it is determined whether or not the current outside air temperature detected by the outside air temperature sensor 31 is equal to or lower than a predetermined temperature. The predetermined temperature in step SB6 is a temperature that is low enough to snow, and can be, for example, 3 ° C. or lower, 2 ° C. or lower, 1 ° C. or lower, 0 ° C. or lower, or below freezing.

  If it is determined as NO in step SB6 and the current outside air temperature is higher than the predetermined temperature and is not likely to snow, the process proceeds to step SB7. In step SB7, the opening degree (f) obtained in step SB5 is set as the opening degree of the inside / outside air switching damper 11c.

  If it is determined as YES in step SB6 and the current outside air temperature is low enough to snow, it proceeds to step SB8 and whether or not the current solar radiation amount detected by the solar radiation sensor 33 is equal to or less than a predetermined amount. Determine whether. The predetermined amount in step SB8 is a strong solar radiation amount that almost melts in the middle of snowing even if it is snowing. If NO is determined in step SB8 and the amount of solar radiation is large and the snow is likely to melt by solar radiation, the process proceeds to step SB7.

  If it is determined as YES in step SB8 and the current amount of solar radiation is high enough to melt snow, the process proceeds to step SB9 to determine whether or not the wiper switch 42 is ON. If the wiper switch 42 is ON, it means that snow has fallen to adhere to the surface of the front windshield G. In this case, the process proceeds to step SB10. On the other hand, if it is determined NO in step SB10 and snow is falling but not so much as to adhere to the surface of the front windshield G, the process proceeds to step SB7.

  In step SB10, it is determined whether or not the vehicle speed detected by the vehicle speed sensor 41 is equal to or higher than a predetermined vehicle speed. The predetermined vehicle speed in step SB10 is a reference speed for determining whether or not the vehicle is traveling at a high speed, and can be set, for example, in the range of 60 km / h to 80 km / h. In step SB10, the determination reference speed may be lowered to determine whether or not the vehicle is traveling. If it is determined as YES in step SB10 and the vehicle is traveling at a high speed, the process proceeds to step SB11. In step SB11, the target opening degree of the inside / outside air switching damper 11c is set to the outside air introduction opening degree regardless of the opening degree calculated in step SB5.

  On the other hand, if it is determined as NO in step SB10 and the vehicle is not traveling at high speed, even if it is snowing, the momentum of the traveling wind is weak, and the possibility that the snow rides on the traveling wind and enters the vehicle compartment is low. In this case, the process proceeds to step SB7.

  After the opening degree of the air mix door 18 is determined as described above, the process proceeds to step SA9 in the flowchart shown in FIG. 3 to perform drive processing of the inside / outside air switching actuator 11d. Specifically, the inside / outside air switching actuator 11d is operated so that the opening degree of the inside / outside air switching damper 11c becomes the opening degree set in steps SB11 and SB7 in the flowchart shown in FIG.

  Further, the blowing mode and the air volume (voltage applied to the fan drive motor 15b) are also determined based on a known control method.

(Effect of embodiment)
As described above, according to the vehicle air conditioner 1 according to this embodiment, when the inside / outside air mixing mode is selected, the outside air introduction amount and the inside air circulation amount are based on the ease of fogging of the front window glass G. Since it is changed, it becomes possible to increase the amount of inside air circulation within a range where the windshield G is not fogged, thereby reducing the ventilation amount and reducing the energy consumption required for heating.

  Further, when it is detected in step SB6 that the outside air temperature is, for example, 0 ° C. or less, it is assumed that the temperature is likely to snow in winter. In this case, in step SB9, the vehicle wiper is in an operating state. Is detected, it is assumed that snow is actually falling. And when it is detected in step SB10 that the vehicle is in a high-speed running state and the inside / outside air mixing mode is selected, snow rides on the running wind and enters the blowing casing 11 from the outside air introduction port 11a. It is possible to enter.

  At this time, for example, if the head wind is blowing, the momentum of the traveling wind becomes strong, and a part of the traveling wind entering the blower casing 11 may flow into the vehicle interior from the inside air introduction port 11b. However, in this embodiment, since the opening degree of the inside air introduction port 11b by the inside / outside air switching damper 11c is reduced in step SB11, inflow of running wind into the inside of the vehicle interior is considered. Is suppressed, making it difficult for snow to enter the passenger compartment.

  In other words, when the inside / outside air mixing mode is selected, when it is detected that the outside air temperature is equal to or lower than the predetermined temperature, the vehicle wiper is in an operating state, and the vehicle is in a running state, The inside / outside air switching actuator 11d is controlled so that the opening degree of the inside air introduction port 11b is smaller than that before the detection. Accordingly, it is possible to make it difficult for snow to enter the passenger compartment by riding on the traveling wind.

  In this embodiment, in step SB11, the opening degree of the inside air introduction port 11b by the inside / outside air switching damper 11c is set to 0 so that the inside air introduction port 11b is fully closed. The opening degree of the inside air introduction port 11b by the damper 11c may be made smaller than the opening degree calculated in step SB5.

  In step SB8, if the amount of solar radiation is a predetermined amount or less, for example, the weather is cloudy, the possibility that it is snowing increases. In this case, since the opening degree of the inside air introduction port 11b by the inside / outside air switching damper 11c is reduced in step SB11, the control for reducing the opening degree of the inside air introduction port 11b is accurately performed. Note that step SB8 may be omitted.

  Further, when the inside / outside air mixing mode is selected, the opening degree of the inside air introduction port 11b is reduced when it is detected that the wiper is continuously operated for a predetermined time, for example, 30 seconds or more. The inside / outside air switching actuator 11d can also be controlled. This predetermined time can be set to 20 seconds or more and 40 seconds or less, for example. That is, when the wiper is operated only for a few seconds, for example, the wiper is operated only to remove the dirt on the windshield G. In such a case, it is considered that no snow has fallen, Since the opening degree of the inside air introduction port 11b by the inside / outside air switching damper 11c can be reduced when the operation is continued for a predetermined time or more and there is a high possibility that it is snowing, the control is accurately performed. .

  Further, when the inside / outside air mixing mode is selected, the control device 30 detects that the outside air temperature is not more than the predetermined temperature in step SA3 and that the engine water temperature is not more than the threshold value A in step SA4. In step SA6, since the dew point temperature correction value (° C.) is added to the dew point temperature (° C.), the dew point temperature after the correction process is lowered. Thereby, the correction process in the direction in which the outside air introduction amount increases is performed. Therefore, for example, even if there is a time lag until the actual humidity change in the passenger compartment is detected by the front window humidity sensor 38 due to a large number of passengers and the humidity in the passenger compartment suddenly rising, Since the amount of outside air introduced increases under the condition of being easily cloudy, the front window glass G can be made difficult to fog. Note that step SA5 may be omitted.

  In addition, since the outside air introduction amount can be increased when the dew point temperature calculated based on the detection result of the humidity sensor 38 near the front window is low, the correction process can be performed accurately.

  Further, as shown in FIG. 7, the dew point temperature correction value (° C.) decreases as the outside air temperature decreases. Thereby, the amount of outside air introduced can be increased as the outside air temperature decreases. Therefore, the front window glass G can be made more difficult to fog.

Further, when the engine water temperature is a predetermined temperature, for example, 70 ° C. or higher and the heating is sufficiently effective, it is assumed that the front window glass G is not easily fogged. In this case, the dew point temperature correction process in step SA6 of the flowchart shown in FIG. 3 may be prohibited. As a result, the amount of outside air introduced can be prevented from being unnecessarily increased when the front window glass G is not easily fogged. Accordingly, the amount of internal air circulation can be sufficiently secured, so that the amount of energy consumption required for heating can be reduced. Further, the lower the outside air temperature, the lower the threshold A, so that the engine water temperature is lower. At this time, the dew point temperature correction process is performed. Thereby, the front window glass G becomes difficult to be fogged.

  Further, since the threshold value B can be lowered as the outside air temperature becomes lower, the dew point temperature correction process is performed when the outside air temperature is lower. Thereby, the front window glass G becomes difficult to be fogged.

  The above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  The vehicle air conditioner according to the present invention can be used, for example, when air-conditioning a passenger compartment of an automobile.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 11 Blower casing 11a Outside air introduction port 11b Inside air introduction port 11c Inside / outside air switching damper 11d Inside / outside air switching actuator (inside / outside air switching damper driving means)
30 control device 31 outside temperature sensor (outside temperature detecting means)
33 Insolation sensor (Insolation detection means)
34 Cooling water temperature sensor (engine water temperature detection means)
41 Vehicle speed sensor (vehicle speed detection means)
42 Wiper switch (wiper operation state detection means)
G Front window glass (window glass)

Claims (6)

A blower casing formed with an inside air introduction port that introduces air in the vehicle interior and circulates it into the vehicle interior, and an outside air introduction port that introduces air outside the vehicle compartment;
An inside / outside air switching damper that is provided in the blower casing and opens and closes the inside air inlet and the outside air inlet;
Inside / outside air switching damper driving means for driving the inside / outside air switching damper;
A humidity detection sensor disposed in the vehicle interior for detecting the humidity in the vicinity of the window glass in the vehicle interior;
A controller for controlling the inside / outside air switching damper driving means,
The control device controls the inside / outside air switching damper driving means to operate the inside / outside air switching damper in a direction in which the outside air introduction amount increases when the window glass is easily fogged based on the detection result of the humidity detection sensor. On the other hand, when the window glass is difficult to be fogged, the inside / outside air mixing mode for controlling the inside / outside air switching damper driving means to operate the inside / outside air switching damper in the direction in which the inside air circulation amount increases can be selected. In vehicle air conditioners,
The vehicle air conditioner includes an outside air temperature detecting means for detecting an outside air temperature, and an engine water temperature detecting means for detecting an engine water temperature of the vehicle,
When the inside / outside air mixing mode is selected, the control device is configured such that the outside air temperature is not more than a predetermined temperature by the outside air temperature detecting means and the engine water temperature is not more than a first threshold value by the engine water temperature detecting means. When the air conditioner is detected, the vehicle air conditioner performs a correction process so as to increase the outside air introduction amount. In the vehicle air conditioner according to claim 1,
When the control device detects that the dew point temperature calculated based on the detection result of the humidity detection sensor is equal to or lower than the second threshold value when the inside / outside air mixing mode is selected, A vehicle air conditioner that performs correction processing so as to increase the amount of introduction. The vehicle air conditioner according to claim 1 or 2,
The vehicle air conditioner is configured such that, when the correction process is performed, the outside air introduction amount is increased as the outside air temperature detected by the outside air temperature detecting unit decreases. In the vehicle air conditioner according to any one of claims 1 to 3,
The vehicle air conditioner is configured to prohibit the correction process when the engine water temperature detecting means detects that the engine water temperature is equal to or higher than a predetermined temperature. In the vehicle air conditioner according to any one of claims 1 to 4,
The vehicle air conditioner is characterized in that the control device is configured to increase the first threshold as the outside air temperature detected by the outside air temperature detecting means increases. In the vehicle air conditioner according to any one of claims 1 to 5,
The vehicle air conditioner is characterized in that the control device is configured to lower the second threshold as the outside air temperature detected by the outside air temperature detecting means decreases.

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