JP2016030564A - Air conditioner for vehicles - Google Patents

Abstract

In a vehicle air conditioner having an inside / outside air mixing mode, it is possible to make an occupant feel that heating is effective even in a passenger compartment that is not sufficiently warm. When air in the vehicle interior and air outside the vehicle interior are introduced into the temperature control unit during heating, it is determined whether or not the occupant is in a cold state, and if it is determined to be in a cold state, it is not cold. The intake unit is controlled so that the amount of the inside air circulation set is smaller than that determined when the situation is determined. [Selection] Figure 1

Description

  The present invention relates to a vehicle air conditioner mounted on, for example, an automobile.

  2. Description of the Related Art Conventionally, this type of vehicle air conditioner is configured such that air in the vehicle compartment (inside air) and air outside the vehicle compartment (outside air) can be selected and introduced into the air conditioning casing. In addition, after the temperature of the introduced air is adjusted by a heat exchanger or the like, the air is blown out from a selected outlet among the defroster outlet, vent outlet, and heat outlet formed in the air conditioning casing. It has become.

  The vehicle air conditioners disclosed in Patent Documents 1 and 2 are an inside air circulation mode for supplying the inside air after the inside air is introduced and adjusting the temperature, and an outside air introduction mode for supplying the inside air after adjusting the temperature by introducing outside air. And after adjusting the temperature by introducing both the inside air and the outside air, it is possible to switch to three intake modes including an inside / outside air mixing mode supplied to the vehicle interior. 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.

JP-B-1-27891 Japanese Patent No. 5152355

  In general automatic air conditioner control, the blow mode is set so that warm air is blown from the heat blow outlet during heating. The heat outlet is located in the vicinity of the passenger's feet. And if the vehicle interior is not warm enough, such as immediately after heating the vehicle for a long time in the winter, or when the outside air temperature is extremely low, When the mode is the inside / outside air mixing mode, the warm air blown out from the heat outlet is sucked into the air conditioning casing. Even in other blowout modes, the hot air blown out from the blowout opening is sucked into the air conditioning casing.

  At this time, on the desk study, it is possible to increase the temperature of the warm air by increasing the amount of the inside air circulation in the inside / outside air mixing mode to enhance the heating effect. Since the warm air is immediately sucked into the air-conditioning casing, it is difficult for the warm air to flow through the entire passenger compartment. If this happens, it will be difficult for hot air to reach the upper body of the passenger and the passenger in the rear seat, so the passenger will feel that heating is less effective. In particular, this problem becomes significant when the amount of the inside air in the inside / outside air mixing mode is large.

  The present invention has been made in view of the above points, and the object of the present invention is to provide a vehicle air conditioner equipped with an inside / outside air mixing mode in which heating is effective even in a vehicle room that is not sufficiently warmed. So that the occupant feels like

  In order to achieve the above object, in the present invention, the inside air circulation amount is reduced when it is determined that the passenger is cold when the inside / outside air mixing mode can be selected.

The first invention is
An intake section for changing the amount of air circulation in the passenger compartment and the amount of air introduced outside the passenger compartment;
A temperature adjusting unit for adjusting the temperature of the air introduced from the intake unit;
A blowing direction switching unit that supplies conditioned air temperature-controlled by the temperature adjusting unit to each part of the passenger compartment,
It is configured to detect the ease of fogging of the window glass of the vehicle and increase the amount of outside air introduction when the window glass is easily fogged based on the detection result, while increasing the amount of inside air circulation when the window glass is difficult to fog. Vehicle air conditioner equipped with a control device,
It has a cold related information detecting means for detecting information related to the cold felt by the passenger,
The control device determines whether or not the occupant is in a cold state by the cold-related information detecting means when the air inside the vehicle compartment and the air outside the vehicle compartment are introduced into the temperature control unit during heating, and the cold state is present. When it is determined, the intake section is configured to be controlled so that the first inside air circulation amount is set to be smaller than when it is determined that the situation is not cold.

  According to this configuration, since the air in the passenger compartment is introduced into the temperature adjusting unit during the heating to adjust the temperature, the ventilation amount is reduced and the energy consumption required for the heating can be reduced. And, when it is determined by the cold related information detection means that the occupant is cold, the amount of inside air circulation is reduced, so that it is possible to suppress the hot air blown out from being immediately sucked into the temperature adjustment unit become. Accordingly, the warm air easily flows over the entire vehicle interior, so that the warm air easily reaches the upper body of the occupant and the occupant in the rear seat, and the occupant feels that heating is effective.

According to a second invention, in the first invention,
The cold related information detecting means includes at least one of an inside air temperature sensor that detects an air temperature inside the vehicle interior, an outside air temperature sensor that detects an air temperature outside the vehicle interior, and a solar radiation amount detection sensor that detects the amount of solar radiation. It is characterized by.

  According to this configuration, since the passenger's atmospheric temperature can be obtained directly by detecting the air temperature in the vehicle interior by the internal air temperature sensor, it is possible to accurately determine whether or not the passenger is cold. Become. Further, it is possible to accurately determine whether or not the occupant feels cold by detecting the air temperature outside the passenger compartment by the outside air temperature sensor. Moreover, the passenger | crew's atmospheric temperature is indirectly obtained by detecting the amount of solar radiation with a solar radiation amount detection sensor. For example, if the amount of solar radiation is small, it can be determined that the occupant is likely to feel cold.

According to a third invention, in the first or second invention,
The cold related information detecting means is configured to detect the amount of air blown to the upper body of the occupant,
In the case where the air inside the vehicle interior and the air outside the vehicle interior are introduced into the temperature control unit during heating, the control device reduces the amount of air blown to the upper body of the occupant detected by the cooling-related information detection unit. The intake section is configured to be controlled so as to be the second circulating amount of the inside air set to the above.

  According to this configuration, the occupant may feel cold depending on the amount of air blown during heating. In this case, the warm air can easily flow over the entire passenger compartment by reducing the amount of inside air circulation. Therefore, it becomes easy for hot air to reach the passenger's upper body and the passenger in the rear seat, and the passenger feels that heating is effective.

According to a fourth invention, in the third invention,
The cold / heat related information detecting means is configured to detect an air flow rate to the passenger compartment.

  According to this configuration, it becomes possible to detect the amount of air blown to the upper body of the passenger relatively accurately and easily.

According to a fifth invention, in the third invention,
The cold-related information detecting means is configured to detect a conditioned air blowing mode.

  In other words, the amount of air blown to the occupant's upper body changes depending on the conditioned air blowing mode. By detecting this air blowing mode, the amount of air blown to the occupant's upper body can be detected relatively accurately and easily. become.

A sixth invention is the invention according to any one of the third to fifth aspects,
The cold-related information detecting means includes an occupant sensor that detects whether or not there is an occupant in a rear seat disposed behind the front seat of the passenger compartment,
When the control device detects that an occupant in the rear seat is detected by the occupant sensor when introducing the air inside the vehicle interior and the air outside the vehicle interior to the temperature adjustment unit during heating, compared to a case where it is not detected. The intake section is configured to be controlled so that the third internal air circulation amount is set to be small.

  According to this configuration, when the occupant is in the rear seat, the amount of inside air circulation is reduced, so that warm air can easily reach the occupant in the rear seat, and the occupant in the rear seat feels that heating is effective.

A seventh invention is the sixth invention, wherein
The control device controls the intake section so as to achieve a minimum set amount of the inside air circulation amount among the first inside air circulation amount, the second inside air circulation amount, and the third inside air circulation amount. It is comprised by these.

  According to this configuration, the comfort of the occupant during heating is increased by controlling the amount of the inside air circulation to be the smallest.

In an eighth aspect based on the sixth aspect,
When the control device detects whether the inside / outside air mixing mode for introducing the air inside the vehicle interior and the air outside the vehicle compartment into the temperature adjusting unit is detected, and detects that the mode is switched to the inside / outside air mixing mode. Is configured to control the intake section so that the amount of the internal air circulation is any one of the first internal air circulation amount, the second internal air circulation amount, and the third internal air circulation amount. Features.

  According to this configuration, it becomes possible to reduce the inside air circulation amount immediately after switching to the inside / outside air mixing mode, so that the occupant feels that heating is effective at an early stage.

According to a ninth invention, in any one of the first to eighth inventions,
It has a vehicle speed sensor that detects the speed of the vehicle,
The control device determines that air outside the vehicle compartment does not flow into the vehicle interior from an inlet for introducing air into the vehicle interior based on the vehicle speed detected by the vehicle speed sensor and the amount of air blown into the vehicle interior. In this case, the intake section is controlled so as to introduce the air inside the passenger compartment and the air outside the passenger compartment into the temperature adjusting section.

  In other words, when the vehicle speed is high, air outside the passenger compartment may flow into the passenger compartment without adjusting the temperature through the inlet for introducing air into the passenger compartment due to the influence of traveling wind. Will give. At this time, if the amount of air blown into the passenger compartment is large, the air outside the passenger compartment is introduced into the temperature control section even if the vehicle speed is somewhat high. Therefore, the temperature from the inlet for introducing air into the passenger compartment is increased. It is avoided to flow into the passenger compartment without being adjusted.

  In this invention, when it is determined that the air outside the passenger compartment does not flow into the passenger compartment from the inlet for introducing air into the passenger compartment based on the vehicle speed and the amount of air blown into the passenger compartment, Since the air outside the passenger compartment is introduced into the temperature control section, the outside air does not flow into the passenger compartment without being temperature controlled.

In a tenth aspect of the present invention based on any one of the first to ninth aspects,
The control device sets the outside air introduction mode in which air outside the passenger compartment is introduced into the temperature control unit when the blowing is stopped and the window glass is likely to be clouded, while the window glass is not easily fogged. Is configured to be in an inside air circulation mode in which the air in the passenger compartment is introduced into the temperature adjusting unit.

  That is, even when the blowing is stopped, when the vehicle travels, air outside the passenger compartment is received by the traveling wind and enters the intake portion. At this time, when the window glass is easily fogged, the fogging is suppressed by setting the outside air introduction mode. In addition, when the window glass is difficult to be fogged, it is possible to prevent the air whose temperature has not been adjusted from being supplied to the passenger compartment by setting the inside air circulation mode.

  According to the first invention, since the inside air circulation amount is reduced when it is determined that the occupant is cold during heating, the amount of warm air once blown into the temperature adjustment unit can be reduced. . Thereby, since the warm air easily flows over the entire vehicle interior, it is possible to make the occupant feel that heating is effective even in a vehicle interior that is not sufficiently warm.

  According to the second aspect of the invention, by using the inside air temperature sensor that detects the air temperature inside the vehicle interior, the outside air temperature sensor that detects the air temperature outside the vehicle interior, and the solar radiation amount detection sensor that detects the amount of solar radiation, Whether or not it is a cold situation can be accurately determined.

  According to the third aspect of the invention, the smaller the amount of air blown to the upper body of the occupant, the smaller the inside air circulation amount, so that the occupant can feel that heating is effective even if the amount of warm air is small.

  According to the fourth aspect of the invention, since the amount of air blown to the passenger compartment is detected, the amount of air blown to the upper body of the occupant can be detected relatively accurately and easily.

  According to the fifth aspect, since the blowing mode is detected, the amount of air blown to the occupant's upper body can be detected relatively accurately and easily.

  According to the sixth aspect of the invention, since the inside air circulation amount is reduced when it is detected that there is an occupant in the rear seat, it is possible to make the occupant in the rear seat feel that heating is working.

  According to the seventh aspect, the intake portion is controlled so as to be the smallest amount of the inside air circulation amount among the first inside air circulation amount, the second inside air circulation amount, and the third inside air circulation amount. Crew comfort can be improved.

  According to the eighth aspect, since the amount of the inside air circulation can be reduced immediately after switching to the inside / outside air mixing mode, it is possible to make the occupant feel that heating is effective at an early stage.

  According to the ninth aspect, when it is determined that the air outside the passenger compartment does not flow into the passenger compartment from the air inlet of the passenger compartment based on the vehicle speed and the amount of air blown into the passenger compartment, Since the air outside the passenger compartment is introduced into the temperature adjustment unit, the outside air does not flow into the passenger compartment without being temperature-controlled, and it is possible to make it difficult for the passenger to feel uncomfortable.

  According to the tenth aspect of the invention, when the blowing is stopped, the outside air introduction mode is set when the window glass is easily fogged, while the inside air circulation mode is set when the window glass is difficult to fog. Suppression and passenger comfort can be achieved at a high level.

It is a schematic block diagram of the vehicle air conditioner which concerns on embodiment. It is a block diagram of a vehicle air conditioner. It is a flowchart which shows the control content by a control apparatus. It is a graph which calculates a 1st intake door correction | amendment opening degree. It is a graph which calculates a 2nd intake door correction | amendment opening degree. It is a graph which calculates a 3rd intake door correction | amendment opening degree. 10 is a flowchart showing a part of control contents according to Modification 1. 10 is a flowchart showing a part of control contents according to Modification 2.

  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 an intake portion 11, a temperature adjustment portion 12, and a blow-off direction switching portion 13 in order from the upstream side toward the downstream side in the air flow direction. The intake portion 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 an intake duct (not shown), for example, and introduces outside air. The inside air introduction port 11b opens inside the instrument panel and introduces inside air at the foot of the passenger.

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

  For example, as shown by a solid line in FIG. 1, when the outside air introduction port 11a is fully closed and the intake door 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 intake door 11c at this time shall be 100%. On the other hand, if the outside air introduction port 11a is fully opened and the intake door 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 intake door 11c at this time is 0%. When the opening degree of the intake door 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. . This intake mode is the inside / outside air mixing mode. In the inside / outside air mixing mode, the introduction ratio of the inside air and the outside air, that is, the inside air circulation amount and the outside air introduction amount is changed according to the opening degree of the intake door 11c. Details of the intake mode switching control will be described later.

  The intake section 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 intake portion 11, and then blown to the temperature adjusting portion 12. 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. Since the blower motor 15b is controlled by the control device 30, the control device 30 can indirectly obtain the amount of conditioned air blown into the vehicle interior based on the voltage applied to the blower motor 15b.

  The temperature adjustment unit 12 is a part for adjusting the temperature of the air introduced from the intake unit 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. The heating heat exchanger 17 can be constituted by, for example, a heater core to which engine cooling water is supplied, but is not limited thereto, and can heat the air, for example, an electric heater. It only has to be a thing. 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 or a film door 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 31, an inside air temperature sensor 32, a solar radiation amount sensor 33, a cooling water temperature sensor 34, an evaporator sensor 35, a front window temperature sensor 36, and a front window vicinity temperature sensor. 37, a front window vicinity humidity sensor 38, an operation switch 39, an occupant sensor 40, and a vehicle speed sensor 41 are provided. These sensors 31 to 38, 40, 41 are connected to the control device 30 and output signals to the control device 30. The operation switch 39 is also connected to the control device 30 so that the control device 30 can detect the operation state by the occupant.

  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 constitute a cold related information detection unit that detects information related to the cold 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 detects the temperature of the cooling water of the engine mounted on the vehicle, and the cooling water temperature sensor 34 estimates the temperature of the cooling water of the engine flowing into the heating heat exchanger 17. be able to. 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. The front window vicinity humidity 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 in the vicinity of the vehicle interior surface of the front window glass G.

  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 control device 30 controls the inside / outside air switching actuator 11d, the air mix actuator 18a, and the blowing direction switching based on the signals (output values) output from the sensors 31 to 38, 40, and 41 and the operation state of the operation switch 39. The 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 control device 30 can detect the amount of air blown to the upper body of the occupant by the control of the blower motor 15b and the control of switching the blowing mode, and the control device 30 that performs this control includes the cooling-related information detecting means of the present invention. It is. 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 30 controls the inside / outside air switching actuator 11d according to the procedure of the flowchart shown in FIG. This control is repeated at a predetermined timing when the air conditioner 1 is turned on and the control device 30 determines that it is necessary to perform heating. During cooling, the inside / outside air switching actuator 11d is basically controlled to be in the mode selected by the passenger.

  In step SA1 after the start, the output values of the sensors 31 to 38, 40, and 41 are read, and the operation state of the operation switch 39 is read. In step SA2 following step SA1, as described above, the blowing mode, the air volume (voltage applied to the blower motor 15b), the opening degree of the air mix door 18 are determined, and the operation state of the inside / outside air changeover switch of the operation switch 39 is determined. To determine the target intake mode. The target intake mode is used in the control procedure described later, and the intake mode is not immediately switched to the target intake mode. When the inside / outside air changeover switch has selected the outside air introduction mode, the target intake mode is set to the outside air introduction mode, and when the inside air circulation mode is selected, the target intake mode is set to the inside air circulation mode to mix the inside and outside air. When the mode is selected, the target intake mode is set to the inside / outside air mixing mode.

  In step SA3, the target dew point temperature and the dew point temperature are calculated according to a known method.

  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 36. 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. Further, based on the temperature in the vicinity of the vehicle interior surface of the front window glass G output from the front window vicinity temperature sensor 37, and the humidity in the vicinity of the vehicle interior surface of the front window glass G output from the front window proximity humidity sensor 38. Get the dew point temperature.

  In step SA4, it is determined whether or not the target intake mode is the inside air circulation mode. If YES in step SA4 and the target intake mode is the inside air circulation mode, it is considered that the occupant does not want to introduce outside air, so the routine proceeds to step SA5 and the target intake mode is set to the inside air circulation mode. In step SA13, a control signal is output to the inside / outside air switching actuator 11d. The inside / outside air switching actuator 11d rotates the intake door 11c so as to enter the inside air circulation mode. Thereby, outside air is not introduced into the vehicle interior.

  If it is determined NO in step SA4 and the target intake mode is the outside air introduction mode or the inside / outside air mixing mode, the process proceeds to step SA6. In step SA6, the target opening degree (INTtrg) of the intake door 11c is calculated from the target dew point temperature calculated in step SA3 and the dew point temperature. When the dew point temperature is higher than the target dew point temperature, the target opening degree (INTtrg) of the intake door 11c is calculated so as to increase the outside air introduction amount, and when the dew point temperature is lower than the target dew point temperature, the inside air circulation amount The target opening (INTtrg) of the intake door 11c is calculated so as to increase. 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. Basically, when the front window glass G is easily fogged based on the detection result, the outside air introduction amount is increased while the window glass is When it is difficult to cloud, the inside air circulation amount is increased.

  In the following step SA7, a cold state felt by the occupant is obtained from the inside air temperature output from the inside air temperature sensor 32, the outside air temperature output from the outside air temperature sensor 31, and the amount of solar radiation output from the solar radiation amount sensor 33. Based on this, the first intake door correction opening (INTc1) is calculated. The first intake door correction opening (INTc1) is the first inside air circulation amount.

  As shown in FIG. 4, the first intake door correction opening (INTc1) is set so that the inside air circulation amount decreases as the degree becomes stronger when it can be determined that the inside air temperature is low and the passenger feels cold. Also, when the outside air temperature is low and it can be determined that the occupant feels cold, the higher the degree, the lower the amount of in-air circulation is set, and when the amount of solar radiation is low and the occupant can be determined to feel cold The higher the degree is, the less the inside air circulation amount is set. That is, it can be determined whether or not the passenger feels cold. The first intake door correction opening (INTc1) is set between 0% and 100%.

  Step SA8 following step SA7 shown in FIG. 3 calculates the second intake door correction opening degree (INTc2) from the air volume (voltage applied to the blower motor 15b) and the blowing mode. The second intake door correction opening (INTc2) is the second inside air circulation amount.

  As shown in FIG. 5, when calculating the second intake door correction opening (INTc2), the correction opening (INTf) calculated based on the air volume and the correction opening (INTm) calculated based on the blowing mode. ) In advance, and a lower value of the corrected opening (INTf) and the corrected opening (INTm) is set as the second intake door corrected opening (INTc2). The corrected opening degree (INTf) is set such that the smaller the air volume, the smaller the inside air circulation amount. If the air volume during heating is small, the occupant may feel cold. In this case, the inside air circulation rate is reduced. Further, the correction opening degree (INTm) is set so that the inside air circulation amount is maximized in the defroster mode (DEF), and the inside air circulation amount is minimized in the bi-level mode (B / L). Is set. That is, in the bi-level mode, the amount of air blown to the upper body is larger than that in the defroster mode, and in this case, the inside air circulation amount is reduced. The second intake door correction opening (INTc2) is set between 0% and 100%.

  In step SA9 following step SA8 shown in FIG. 3, the third intake door correction opening degree (INTc3) is calculated from the riding state of the occupant obtained from the riding sensor 40. This third intake door correction opening (INTc3) is the third inside air circulation amount.

  As shown in FIG. 6, when calculating the third intake door correction opening degree (INTc3), when the occupant is seated also in the rear seat, the inside air is compared with the case where only the front seat is seated. Try to reduce the amount of circulation. When the occupant is also seated in the rear seat, the occupant in the rear seat is more likely to feel cold than the occupant in the front seat, and in this case, the amount of inside air circulation is reduced.

  In step SA10 following step SA9 shown in FIG. 3, it is determined whether or not the intake mode is immediately after switching to the inside / outside air switching mode. If YES in step SA10 and immediately after the intake mode is switched to the inside / outside air switching mode, the process proceeds to step SA11. On the other hand, NO is determined in step SA10 and the intake mode is switched to the inside / outside air switching mode. If a predetermined time (for example, about 10 seconds) has elapsed, the process proceeds to step SA12.

  In step SA11, after the intake mode is set to the inside / outside air mixing mode, the first intake door correction opening (INTc1), the second intake door correction opening (INTc2), and the second intake door correction opening (INTc3), After the smallest opening is selected as the intake opening, the process proceeds to step SA13 to output a control signal to the inside / outside air switching actuator 11d. The inside / outside air switching actuator 11d rotates the intake door 11c so as to achieve the opening selected in step SA11.

  In step SA12, the intake mode is set to the inside / outside air mixing mode, the target opening degree (INTtrg), the first intake door correction opening degree (INTc1), the second intake door correction opening degree (INTc2), and the second intake door. After selecting the smallest opening of the correction opening (INTc3) as the intake opening, the process proceeds to step SA13 to output a control signal to the inside / outside air switching actuator 11d. The inside / outside air switching actuator 11d rotates the intake door 11c so as to achieve the opening selected in step SA11.

  As described above, according to this embodiment, basically, if the occupant has not selected the inside-air circulation mode during heating, the air in the vehicle compartment can be introduced into the temperature adjustment unit 12 to adjust the temperature. . Thereby, since the ventilation amount in a vehicle interior can be reduced, the energy consumption required for heating can be reduced.

  In step SA7, it can be determined whether or not the occupant is cold based on the inside air temperature, the outside air temperature, and the amount of solar radiation. When it is determined that the occupant is in a cold state (the inside air temperature and the outside air temperature are low, the amount of solar radiation is small), the amount of inside air circulation is reduced, so the hot air blown out is immediately sucked into the temperature control unit 12. Can be suppressed. Accordingly, the warm air easily flows over the entire vehicle interior, so that the warm air easily reaches the upper body of the occupant and the occupant in the rear seat, and the occupant feels that heating is effective.

  Further, when determining whether or not the occupant is cold in step SA7, the ambience temperature of the occupant is directly obtained by detecting the temperature of the passenger compartment by the inside air temperature sensor 32, so that the occupant is cold. It is possible to accurately determine whether or not there is. Further, it is possible to accurately determine whether or not the occupant feels cold by detecting the air temperature outside the passenger compartment by the outside air temperature sensor 31. Further, by detecting the amount of solar radiation by the solar radiation amount detection sensor 33, the passenger's ambient temperature can be indirectly obtained. Therefore, it can be accurately determined whether or not the passenger is cold.

  In step SA8, it can be determined whether or not the occupant is cold based on the air flow during heating. If the amount of air blown during heating is small, it is easy for the passenger to feel cold. In this case, by reducing the amount of inside air circulation, it is possible to suppress the hot air that has been blown out from being immediately sucked into the temperature control unit 12. Even if there is little, it becomes easy to flow over the whole vehicle interior. Therefore, it becomes easy for hot air to reach the passenger's upper body and the passenger in the rear seat, and the passenger feels that heating is effective.

  Further, when the passenger is in the rear seat at step SA9, the amount of the inside air circulation is reduced, so that the warm air can easily reach the passenger in the rear seat, and the passenger in the rear seat feels that heating is effective.

  Moreover, since the inside air circulation amount is reduced as the inside / outside air mixing mode immediately after switching to the inside / outside air mixing mode, the passenger feels that heating is effective early.

  In the above embodiment, steps SA7 to SA9 are provided, but only one or two of these steps may be provided.

  Further, step SB1 may be inserted between step SA3 and step SA4 as in Modification 1 of the embodiment shown in FIG. Step SB1 determines based on the vehicle speed detected by the vehicle speed sensor 41 and the amount of air blown into the vehicle compartment, whether or not the outside air flows into the vehicle interior from the internal air introduction port 11b. That is, if the vehicle speed detected by the vehicle speed sensor 41 is high, the outside air that has flowed into the intake portion 11 from the outside air introduction port 11a may flow into the vehicle interior without being adjusted in temperature from the inside air introduction port 11b due to the influence of traveling wind. Yes, this gives a sense of incongruity to the passengers. At this time, if the amount of air blown into the passenger compartment is large, air outside the passenger compartment is sucked and introduced into the temperature adjusting unit 12 even if the vehicle speed is somewhat high, so that the temperature is not adjusted from the inside air introduction port 11b. Inflowing into the passenger compartment is avoided. In other words, depending on the magnitude relationship between the vehicle speed and the amount of air blown into the passenger compartment, the air outside the passenger compartment may flow into the passenger compartment without being adjusted in temperature, or the air outside the passenger compartment may be adjusted in temperature and flow into the passenger compartment. There is.

  In this modified example 1, when it is determined that the air outside the passenger compartment does not flow into the passenger compartment from the inside air inlet 11b based on the vehicle speed and the amount of air blown into the passenger compartment (when NO is determined in step SB1), the step is performed. In SA11 and step SA12, the air inside the vehicle interior and the air outside the vehicle interior are introduced into the temperature control unit 12 as the inside / outside air mixing mode, so that the outside air does not flow into the vehicle interior without being temperature-controlled. On the other hand, if it is determined as YES in step SB1 and it is determined that the air outside the vehicle compartment flows into the vehicle interior from the inside air inlet 11b, the process proceeds to step SA5 and the inside air circulation mode is set. It will not flow into the passenger compartment without being done.

  Further, as in Modification 2 of the embodiment shown in FIG. 8, Step SC1, Step SC2, and Step SC3 may be inserted between Step SA3 and Step SA4. Step SC1 is a step of determining whether or not the blower motor 15b is stopped. If it is determined in step SC1 that the blower motor 15b is stopped, the process proceeds to step SC2 to determine whether or not the dew point temperature is equal to or lower than a predetermined temperature. The predetermined temperature is set to a temperature at which the front window glass G is easily fogged. Thereby, in step SC2, it can be determined whether or not the front window glass G is in a state of being easily fogged. If it is determined in step SC2 that the dew point temperature is equal to or lower than the predetermined temperature, the process proceeds to step SA5 to set the inside air circulation mode. On the other hand, if it is determined in step SC2 that the dew point temperature is higher than the predetermined temperature, the process proceeds to step SC3 to enter the outside air introduction mode. That is, even when the air blow is stopped, when the vehicle travels, the air outside the vehicle compartment enters the intake portion 11 due to the traveling wind. At this time, when the dew point temperature is higher than the predetermined temperature and the front window glass G tends to be cloudy, fogging is suppressed by setting the outside air introduction mode. In addition, when the dew point temperature is equal to or lower than the predetermined temperature and the front window glass G is not easily fogged, it is possible to suppress the supply of air whose temperature is not adjusted to the passenger compartment by setting the inside air circulation mode. Become. Therefore, passenger comfort can be further improved.

  Further, the temperature of the window glass other than the front window glass may be detected.

  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.

  As described above, the vehicle air conditioner according to the present invention can be used, for example, when air-conditioning the interior of a vehicle.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 11 Intake part 11a Outside air introduction port 11b Inside air introduction port 11c Intake door 12 Temperature control part 13 Blowing direction switching part 30 Control device 31 Outside temperature sensor 32 Inside temperature sensor 33 Solar radiation sensor 40 Crew sensor 41 Vehicle speed sensor G Front window glass (window glass)

Claims (10)

An intake section for changing the amount of air circulation in the passenger compartment and the amount of air introduced outside the passenger compartment;
A temperature adjusting unit for adjusting the temperature of the air introduced from the intake unit;
A blowing direction switching unit that supplies conditioned air temperature-controlled by the temperature adjusting unit to each part of the passenger compartment,
It is configured to detect the ease of fogging of the window glass of the vehicle and increase the amount of outside air introduction when the window glass is easily fogged based on the detection result, while increasing the amount of inside air circulation when the window glass is difficult to fog. Vehicle air conditioner equipped with a control device,
It has a cold related information detecting means for detecting information related to the cold felt by the passenger,
The control device determines whether or not the occupant is in a cold state by the cold-related information detecting means when the air inside the vehicle compartment and the air outside the vehicle compartment are introduced into the temperature control unit during heating, and the cold state is present. The vehicle air conditioner is configured to control the intake section so that the first internal air circulation amount is set to be smaller than when it is determined that the situation is not cold when apparatus. In the vehicle air conditioner according to claim 1,
The cold related information detecting means includes at least one of an inside air temperature sensor that detects an air temperature inside the vehicle interior, an outside air temperature sensor that detects an air temperature outside the vehicle interior, and a solar radiation amount detection sensor that detects the amount of solar radiation. An air conditioner for a vehicle. The vehicle air conditioner according to claim 1 or 2,
The cold related information detecting means is configured to detect the amount of air blown to the upper body of the occupant,
In the case where the air inside the vehicle interior and the air outside the vehicle interior are introduced into the temperature control unit during heating, the control device reduces the amount of air blown to the upper body of the occupant detected by the cooling-related information detection unit. The vehicle air conditioner is configured to control the intake section so as to achieve a second circulating amount of the inside air set in the above. The vehicle air conditioner according to claim 3,
The vehicle air conditioner is characterized in that the cold / heat related information detecting means is configured to detect an air flow rate to the passenger compartment. The vehicle air conditioner according to claim 3,
The vehicle air conditioner is characterized in that the cold / heat related information detecting means is configured to detect a blowout mode of conditioned air. In the vehicle air conditioner according to any one of claims 3 to 5,
The cold-related information detecting means includes an occupant sensor that detects whether or not there is an occupant in a rear seat disposed behind the front seat of the passenger compartment,
When the control device detects that an occupant in the rear seat is detected by the occupant sensor when introducing the air inside the vehicle interior and the air outside the vehicle interior to the temperature adjustment unit during heating, compared to a case where it is not detected. The vehicle air conditioner is configured to control the intake section so that the third internal air circulation amount set to be small is obtained. The vehicle air conditioner according to claim 6,
The control device controls the intake section so as to achieve a minimum set amount of the inside air circulation amount among the first inside air circulation amount, the second inside air circulation amount, and the third inside air circulation amount. It is comprised in the vehicle air conditioner characterized by the above-mentioned. The vehicle air conditioner according to claim 6,
When the control device detects whether the inside / outside air mixing mode for introducing the air inside the vehicle interior and the air outside the vehicle compartment into the temperature adjusting unit is detected, and detects that the mode is switched to the inside / outside air mixing mode. Is configured to control the intake section so that the amount of the internal air circulation is any one of the first internal air circulation amount, the second internal air circulation amount, and the third internal air circulation amount. A vehicle air conditioner. In the vehicle air conditioner according to any one of claims 1 to 8,
It has a vehicle speed sensor that detects the speed of the vehicle,
The control device determines that air outside the vehicle compartment does not flow into the vehicle interior from an inlet for introducing air into the vehicle interior based on the vehicle speed detected by the vehicle speed sensor and the amount of air blown into the vehicle interior. In such a case, the vehicle air conditioner is configured to control the intake unit so as to introduce the air inside the vehicle compartment and the air outside the vehicle compartment into the temperature adjusting unit. The vehicle air conditioner according to any one of claims 1 to 9,
The control device sets the outside air introduction mode in which air outside the passenger compartment is introduced into the temperature control unit when the blowing is stopped and the window glass is likely to be clouded, while the window glass is not easily fogged. Is configured to be in an inside air circulation mode in which air in the passenger compartment is introduced into the temperature control unit.

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