JP3861805B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle air conditioner that blows air to a front seat side foot and a rear seat side foot of a passenger in a vehicle interior.
[0002]
[Prior art]
Conventionally, during warm-up control, which is air conditioning control in the process of increasing the temperature of air blown into the passenger compartment, the target air temperature (TAO) of the blown air is input from an air conditioning sensor such as an internal air temperature sensor provided near the front seat of the vehicle. The temperature of the blown air and the air volume were adjusted based on the target blow temperature (TAO).
[0003]
[Problems to be solved by the invention]
However, when the temperature on the front seat side of the vehicle increases, the temperature detected by the internal air temperature sensor provided near the front seat of the vehicle also increases, so that the target outlet temperature (TAO) decreases regardless of the temperature on the rear seat side. become. For this reason, not only the temperature of the blown-out air blown out to the rear seat side is lowered, but also the air volume of the blown air is reduced, which gives the rear-seat occupant discomfort due to insufficient heating.
[0004]
In addition, until now, fogging of the window glass may occur when the humidity rises due to an increase in the number of passengers in the vehicle interior, etc. The occupant switches the blowing mode to the defroster mode or the foot / diff mode by manual operation to prevent fogging of the window glass As a result, the passengers felt troublesome to operate.
[0005]
In view of the above points, the first object of the present invention is to improve the heating feeling on the rear seat side. A second object is to suppress the troublesomeness caused by the manual operation of the passenger.
[0017]
[Means for Solving the Problems]
  To achieve the above objective,Claim1In the invention described in the above, a blower (7) that blows out air toward the passenger compartment,
  A heating heat exchanger (12) for heating the blown air of the blower (7);
  A front-seat-side foot opening (19) that is provided on the downstream side of the air flow of the heating heat exchanger (12) and blows out the blown air that has passed through the heating heat exchanger (12) toward the front-seat occupant feet; ,
  A rear-seat-side foot opening (20) that is provided on the downstream side of the air flow of the heating heat exchanger (12), and blows out the blown air toward the rear-seat-side occupant feet;
  A defroster opening (15) that is provided on the downstream side of the air flow of the heat exchanger for heating (12) and blows out blown air toward the inner surface of the window glass;
  A first foot mode in which the amount of air blown from the front seat side foot opening (19) is larger than the amount of air blown from the rear seat side foot opening (20);
  The total amount of air blown from both openings is reduced compared to the first foot mode, and at least a second foot mode for blowing a predetermined amount of blown air from the defroster opening (15) can be set.
  When the information value correlated with the fogging condition of the window glass is equal to or greater than the predetermined value, it is determined that the window glass is cloudy or near, or the second foot mode is executed, When the value is less than the predetermined value, execute the first foot modeAnd
  Further, the first foot mode and the second foot mode are executed only when the target blowing temperature (TAO) of the air blown into the vehicle interior is equal to or higher than a predetermined temperature.It is characterized by that.
[0018]
According to this, when the information value correlated with the fogging state of the window glass is less than the predetermined value, it is determined that the window glass is not fogged, and the first foot mode for warming the passenger's feet is executed. Further, when the information value correlated with the fogging condition of the window glass is equal to or greater than a predetermined value, it is determined that the window glass is close to the fogging condition or fogging has occurred. In this case, by executing the second foot mode, the air heated toward the window glass is automatically blown out from the defroster opening (15), so that the relative humidity in the vicinity of the window glass is lowered, so that the cloudy Can prevent or remove automatically. For this reason, the troublesome manual operation of the passenger can be suppressed. Moreover, since the air volume of the air blown at the foot of the occupant is ensured, deterioration of the occupant's heating feeling can be suppressed.
[0020]
In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 is an overall configuration diagram of an embodiment of the present invention. An air conditioning case 2 of an air conditioner 1 is disposed inside an instrument panel at the front of a vehicle interior, and forms a passage for air flowing toward the vehicle interior. An inside / outside air switching box 3 is provided at the upstream end of the air flow of the air conditioning case 2, and the inside / outside air switching door 4 in the inside / outside air switching box 3 is used to open and close the inside air inlet 5 and the outside air inlet 6. Switch between indoor air (inside air) or outside the vehicle cabin (outside air). The inside / outside air switching door 4 is driven by an electric drive device 22 composed of a servo motor.
[0022]
A blower 7 is arranged on the downstream side of the air flow in the inside / outside air switching box 3, a centrifugal fan 9 is housed in a case 8 of the blower 7, and the fan 9 is rotationally driven by the electric motor 10. A voltage applied to the electric motor 10 (hereinafter referred to as a blower voltage) is controlled by the drive circuit 40, and the rotational speed of the blower 7 and thus the air volume of the blower 7 is adjusted by controlling the blower voltage.
[0023]
An evaporator 11 as a cooling heat exchanger is arranged on the downstream side of the air flow of the blower 7. The evaporator 11 is provided in a refrigeration cycle including a compressor 30 that compresses and discharges refrigerant, and the low-pressure refrigerant flowing into the evaporator 11 absorbs heat from the blown air of the blower 7 and evaporates. Cool the blown air.
[0024]
The compressor 30 is driven by a vehicle engine (not shown). The compressor 30 is provided with an electromagnetic clutch 31 for power interruption, and power supply to the electromagnetic clutch 31 is interrupted by a drive circuit 41. Is done.
[0025]
In the air conditioning case 2, a heater core 12 as a heat exchanger for heating is disposed on the downstream side of the air flow of the evaporator 11, and the heater core 12 heats the blown air using hot water (cooling water) of the vehicle engine as a heat source. To do. Further, a bypass passage 13 is formed on the side of the heater core 12 so as to bypass the heater core 12 and allow the blown air to flow.
[0026]
Between the evaporator 11 and the heater core 12, the air mix door 14 which consists of a plate-shaped door is arrange | positioned so that rotation is possible. This air mix door 14 is a temperature adjusting means, and adjusts the air volume ratio between the hot air passing through the heater core 12 and the cold air passing through the bypass passage 13 to adjust the temperature of the air blown into the vehicle interior. Hot air from the heater core 12 and cold air from the bypass passage 13 can be mixed on the downstream side of the heater core 12 to create air at a desired temperature. The air mix door 14 is driven by an electric drive device 23 formed of a servo motor.
[0027]
A defroster opening 15, a face opening 16, and a foot opening 17 are opened at the downstream end of the air flow of the air conditioning case 2. The foot opening 17 has a front seat foot opening 19 and a rear seat foot opening 20 respectively. The defroster opening 15 blows blown air toward the inner surface of the vehicle front window glass through a defroster duct (not shown), and is opened and closed by a rotatable plate-like defroster door 15a.
[0028]
The face opening 16 blows blown air toward the upper body of the passenger in the vehicle cabin via a face duct (not shown), and is opened and closed by a rotatable plate-like face door 16a. Furthermore, the foot opening 17 is opened and closed by a rotatable plate-like foot door 17a, and then branches into a front seat foot opening 19 and a rear seat foot opening 20. The front-seat-side foot opening 19 blows out blown air toward the front of the passenger compartment on the front-seat side of the passenger compartment through a foot front-seat duct (not shown). The rear-seat-side foot opening 20 blows out blown air toward the passenger compartment's rear-seat-side occupant feet via a foot-rear-seat duct (not shown). The air volume ratio between the front seat foot opening 19 and the rear seat foot opening 20 is determined by the position of the plate-like foot front and rear air distribution doors 21 that are rotatable.
[0029]
The doors 15a, 16a, and 17a for setting the blowing mode described above are connected to a common link mechanism 18 and are driven by an electric drive device 24 that is a servo motor via the link mechanism 18. Further, the front and rear of the foot is provided at a branch portion between the foot opening 17 and the front seat side foot opening 19 and the rear seat side foot opening 20 to change the air volume ratio of the air blown to the passenger's feet between the front seat and the rear seat. The air distribution door 21 is driven by an electric drive device 25 comprising a servo motor. And the operation | movement of each door 15a, 16a, 17a, 21 can set the six blowing modes described below.
[0030]
That is, in the face mode, the face opening 16 is fully opened, the defroster opening 15 and the foot opening 17 are closed, and blown air is blown out from the face opening 16.
[0031]
In the first foot mode, as shown in FIG. 2, the foot opening 17 is fully opened, the defroster opening 15 is opened by a small opening, and the face opening 16 is fully closed. Then, the position of the foot front and rear air distribution door 21 is set to a position where the ventilation path branched to the front seat side foot opening 19 is larger than the ventilation path branched to the rear seat side foot opening 20. For example, about 60% of the blown air is blown to the front seat side foot opening 19 as the air volume ratio of the blown air, and about 40% of the blown air is blown to the rear seat side foot opening 20 as the air volume ratio of the blown air. Then, a small amount is blown to the defroster opening 15.
[0032]
In the second foot mode, as shown in FIG. 3, the foot opening 17 is fully opened, the defroster opening 15 is opened by a small opening, and the face opening 16 is fully closed. Then, the position of the foot front and rear air distribution door 21 is set to a position where the ventilation path branched to the front seat side foot opening 19 is equal to the ventilation path branched to the rear seat side foot opening 20. Specifically, the air volume ratio between the front seat foot opening 19 and the rear seat foot opening 20 is set to about 50%, and the air is blown to the defroster opening 15 by a small amount.
[0033]
In the bi-level mode, as shown in FIG. 4, both the face opening 16 and the foot opening 17 are opened, and the defroster opening 15 is closed. The position of the front and rear air distribution doors 21 is set so that the area ratios of the entrances branching the ventilation path between the front seat side foot opening 19 and the rear seat side foot opening 20 are equal to each other. Are equal. For example, about 40% of the blown air is blown into the face opening 16 as the air volume ratio of the blown air, and the air volume ratio of the blown air is about 30% at the front seat side foot opening 19 and the foot rear seat side opening. Blows air at a time.
[0034]
In the foot defroster mode, the defroster opening 15 is opened larger than the foot opening 17 and the face opening 16 is semi-closed as shown in FIG. The position of the front and rear air distribution doors 21 is set so that the ventilation path between the front seat side foot opening 19 and the rear seat side foot opening 20 is equal. Thereby, compared with the time of the 1st, 2nd foot mode, the blowing air volume from the foot opening part 17 is decreased, and the blowing air volume from the defroster opening part 15 is increased. Specifically, the air volume ratio between the front seat side foot opening 19 and the rear seat side foot opening 20 is blown by about 30%, and the defroster opening 15 is blown by about 40%.
[0035]
In the defroster mode, the defroster opening 15 is fully opened, the face opening 16 and the foot opening 17 are fully closed, and blown air is blown out from the defroster opening 15.
[0036]
Incidentally, the angle θ1 in FIGS. 2 to 5 is an angle when the foot opening 17 is fully opened. Further, the angle θ3 is larger than the angle θ2. These θ2 and θ3 are angles at which the foot front and rear air distribution doors 21 are opened from the dotted line position where the rear seat side foot opening 20 is fully closed.
[0037]
Next, the outline of the electric control unit in the present embodiment will be described. The ECU 50 includes a well-known microcomputer including a CPU, a ROM, a RAM, and the like and its peripheral circuits. The ECU 50 includes a vehicle engine. Power is supplied from the in-vehicle battery 61 via the ignition switch 60.
[0038]
A detection signal is input from the sensor group 70 to the ECU 50 for air conditioning control. These sensors include a water temperature sensor 71 for detecting the engine cooling water temperature TW, an inside air sensor 72 for detecting the inside air temperature TR, an outside air sensor 73 for detecting the outside air temperature TAM, a solar radiation sensor 74 for detecting the solar radiation amount TS, and the evaporator 11. An evaporative air temperature sensor 75 for detecting the air temperature (hereinafter referred to as the post-evaporator temperature) TE immediately after passing through the vehicle, a vehicle speed sensor 76 for detecting the vehicle speed SPD, and a humidity sensor 77 for detecting the relative humidity RH of the vehicle interior air are provided. It has been. The relative humidity% in the vicinity of the window glass is calculated based on the vehicle speed SPD, the outside air temperature TAM, the relative humidity RH, and the like.
[0039]
Further, the air conditioning operation panel 80 arranged around the instrument panel in the passenger compartment is provided with the following switches that are manually operated by a passenger, and operation signals of these switches are also input to the ECU 50.
[0040]
As switches of the air conditioning operation panel 80, a temperature setting switch 81 that generates a signal of a set temperature Tset, an air volume switch 82 that generates an air volume switching signal of the blower 7, an inside / outside air switch 83 that generates an inside / outside air switching signal, and a blow-out mode signal Are provided, an air conditioner switch 85 for generating an on / off signal for the electromagnetic clutch 31 of the compressor 30, and an auto switch 86 for generating an auto signal for setting an automatic control mode of the air conditioner.
[0041]
Next, the operation of the air conditioner 1 having the above configuration will be described. The flowchart of FIG. 6 shows an outline of the control processing executed by the microcomputer of the ECU 50. The control routine of FIG. 6 shows the air conditioning operation panel 80 in a state where the ignition switch of the vehicle engine is turned on and power is supplied to the ECU 50. Starts when the auto switch 86 is turned on.
[0042]
First, in step S100, a flag, a timer, and the like are initialized, and in the next step S110, a detection signal from the sensor group 70, an operation signal from the air conditioning operation panel 80, and the like are read. Based on this operation signal, it is determined whether to send conditioned air to the feet of the rear seat passenger.
[0043]
Subsequently, in step S120, the target air temperature TAO (hereinafter referred to as TAO) of the air-conditioning air blown into the passenger compartment is converted into the air-conditioning heat load conditions (inside temperature TR, outside temperature TAM, solar radiation amount) in step S120. TS). This TAO is a blowing temperature necessary for maintaining the vehicle interior at the set temperature Tset of the temperature setting switch 81.
[0044]
[Expression 1]
TAO = Kset × Tset−Kr × TR−Kam × TAM−Ks × TS + C where Kset, Kr, Kam, Ks are control gains, and Tset, TR, TAM, TS are the set temperature, internal temperature, external temperature, The amount of solar radiation, C is a correction constant.
[0045]
Next, the process proceeds to step S130, and the target opening degree SW of the air mix door 14 is calculated and determined based on the TAO, the evaporator post-temperature TE, and the engine coolant temperature TW. This target opening degree SW is an opening degree necessary for maintaining the temperature of the blown air blown into the vehicle interior at TAO.
[0046]
Next, in step S140, the target air blowing amount BLW of the air blown by the blower fan of the blower unit is calculated based on the TAO. The calculation method of the target air flow amount BLW is well known. The target air volume is increased on the high temperature side (maximum heating side) and the low temperature side (maximum cooling side) of the TAO, and the target air volume is decreased in the intermediate temperature range of the TAO. .
[0047]
Next, in step S150, the blowing mode is determined according to the TAO. Details of the setting of the blowing mode will be described later.
[0048]
Next, in step S160, various control values are output to the electric drive units 22 to 25 and the drive circuits 40 and 41 based on the setting values calculated in steps S130 to S150 to perform air conditioning control.
[0049]
First, the air mix door 14 is driven by the actuator 23 based on the target opening degree SW of the air mix door 14 set in step S130.
[0050]
And the applied voltage is controlled and the rotation speed of the blower fan driving motor 10 is controlled so that the target air volume BLW of step S140 is obtained.
[0051]
Subsequently, each of the blowing mode doors 15a, 16a, 17a, and 21 is driven by the actuators 24 and 25 so as to be in the blowing mode set in step S150. Further, the inside / outside air switching motor actuator 22 controls the operation position of the inside / outside air door 4 so as to obtain the inside / outside air mode.
[0052]
Subsequently, the flowchart showing the operation of FIG. 7 regarding the setting of the blowing mode in step S150 will be described in detail with reference to FIG. In addition, FIG. 8 is explanatory drawing which shows that the blowing mode is set based on TAO. The vertical axis in FIG. 8 indicates the blowing mode, and the horizontal axis indicates TAO. As the horizontal axis goes to the left, the TAO is lower, and the right is higher. A, B, C, D, E, and F shown on the horizontal axis are threshold values for blowing mode switching. The threshold values are, for example, A is about 25 ° C., B is about 28 ° C., C is about 37 ° C., D is about 40 ° C., E is about 86 ° C., and F is about 89 ° C.
[0053]
First, in step S201, it is determined whether the TAO mode is F or higher. If the TAO mode is F or higher, the process proceeds to step S210, the first foot mode is set, and if it is not F or higher, the process proceeds to step S202.
[0054]
In step S202, if the TAO mode is E or less, the process proceeds to step S203. If the TAO mode is not E or less, the process proceeds to step S204.
[0055]
Next, in step S204, when the previous blowing mode determination is the first foot mode, the process proceeds to step S210, and the setting of the first foot mode is continued. If the previous blow mode determination is not the first foot mode, the process proceeds to step S211 to set the second foot mode. Thus, by comparing with the previous blowing mode, the hysteresis width for preventing control hunting can be reflected in the blowing mode determination.
[0056]
Next, in step S203, if the TAO mode is D or higher, the process proceeds to step S211 and the second foot mode is set. If not, the process proceeds to step S205.
[0057]
Subsequently, in step S205, if the TAO mode is C or less, the process proceeds to step S206, and if it is not C or less, the process proceeds to step S207.
[0058]
Next, in step S207, when the previous blowing mode determination is the second foot mode, the process proceeds to step S211 and the setting of the second foot mode is continued. If the previous blow mode determination is not the second foot mode, the process proceeds to step S212, and the bi-level mode is set.
[0059]
Next, in step S206, if the TAO mode is B or higher, the process proceeds to step S212, and the bilevel mode is set. If not, the process proceeds to step S208.
[0060]
In step S208, if the TAO mode is A or less, the process proceeds to step S213, and the face mode is set. If the TAO mode is not A or less, the process proceeds to step S209.
[0061]
Subsequently, in step S209, when the previous blowing mode is the bi-level mode, the process proceeds to step S212 and the bi-level mode is continued, and when the previous blowing mode is not the bi-level mode, the face mode is set.
[0062]
Then, the effect by the above-mentioned blowing mode setting is demonstrated. In the flowchart showing the operation of the blowing mode setting in FIG. 7, the first foot mode and the second foot mode can be set based on the TAO mode. Thereby, when the temperature rise on the front seat side of the vehicle interior is detected, the air volume ratio of the blown air blown toward the rear seat side occupant feet can be increased, so that the cold radiation from the rear seat side wall surface can be suppressed.
[0063]
(Second Embodiment)
In the first embodiment, the two foot modes in which the air volume ratios of the blown air blown toward the passenger's feet on the front seat side and the rear seat side are different based on TAO have been described. In the second embodiment, a first foot mode and a second foot mode different from these two foot modes can be set, and the blowing mode is set based on the TAO and the relative humidity of the window glass. .
[0064]
In the first foot mode, as shown in FIG. 9, the foot opening 17 is fully opened, and the face opening 16 and the defroster opening 15 are fully closed. Then, the position of the foot front and rear air distribution door 21 is set to a position where the ventilation path branched to the front seat side foot opening 19 is larger than the ventilation path branched to the rear seat side foot opening 20. For example, about 60% of the blown air is blown to the front seat side foot opening 19 as the air volume ratio of the blown air, and about 40% of the blown air is blown as the air volume ratio with the rear seat side foot opening 20.
[0065]
As shown in FIG. 10, the second foot mode is a blowing mode in which the defroster opening 15 is slightly blocked and the air volume of the blown air is reduced as compared with the foot defroster mode of the first embodiment. For example, about 40% of the blown air is blown into the front seat side foot opening 19 as the air volume ratio of the blown air, and about 40% of the blown air is blown into the rear seat side foot opening 20 as the air volume ratio of the blown air. Then, the blown air is blown into the defroster opening 15 by about 20% as the air volume ratio of the blown air.
[0066]
Incidentally, the angle θ8 in FIG. 5 is larger than the angle θ6 in FIG. Θ6 and θ8 are angles at which the defroster door 15a is opened from the dotted line position where the defroster opening 15 is fully closed. The angle θ5 in FIG. 5 is smaller than the angle θ7 in FIG. These θ7 and θ5 are angles at which the foot door 17a is opened from the dotted line position where the foot opening 17 is fully closed.
[0067]
The first foot mode and the second foot mode in the second embodiment are set under the conditions shown in FIG. Specifically, one of the first foot mode and the second foot mode is set by cloudy humidity estimation until TAO becomes A or less. For example, when the cloudy humidity estimation obtained from FIG. 12 is ON, the second foot mode is set, and when it is OFF, the first foot mode is set. In FIG. 11, the vertical axis represents the blowing mode, the horizontal axis represents TAO, and A and B on the horizontal axis are threshold values for switching the blowing mode setting. For example, A is about 37 ° C. and B is about 40 ° C.
[0068]
Further, the cloudy humidity estimation in FIG. 11 is a threshold value determined by the relative humidity C and D near the window glass in FIG. In FIG. 12, the vertical axis indicates cloudy humidity estimation ON and OFF, and the horizontal axis indicates relative humidity% C and D near the window glass. For example, C and D on the horizontal axis are about 90% and D is about 95%.
[0069]
Next, functions and effects in the second embodiment will be described.
[0070]
The condition of the air conditioning in the passenger compartment on the front seat side and the rear seat side is determined by TAO and the relative humidity in the passenger compartment, and based on this determination, the air blown out toward the front seat side passenger feet and the rear seat side passenger feet It is possible to switch between the air volume ratio and the air volume ratio of the blown air blown out to the inner surface of the window glass. For this reason, the fogging of the window glass can be automatically removed by executing the second foot mode when the window glass is close to being fogged. Further, in the second foot mode, the air volume at the occupant's feet is increased on both the front seat side and the rear seat side as compared with the defroster mode or the foot / diff mode, so that the shortage of the foot air volume due to the blowing mode switching can be improved.
[0071]
(Third embodiment)
In 1st Embodiment, in the flowchart which shows the action | operation of the blowing mode setting of FIG. 7, 1st foot mode was set in step S210, and 2nd foot mode was set in step S211. In the present embodiment, the air volume ratio in the first foot mode and the air volume ratio in the second foot mode are set as follows.
[0072]
That is, in the first foot mode, the foot opening 17 is fully opened, the defroster opening 15 is opened by a small opening, and the face opening 16 is closed. And the ventilation path which branches the position of the foot front and rear air distribution door 21 to the front seat side foot opening part 19 is made substantially the same as the ventilation path which branches to the rear seat side foot opening part 20. For example, about 50% of the blown air is blown to the front seat side foot opening 19 as the air volume ratio of the blown air, and about 50% of the blown air is blown to the rear seat side foot opening 20 as the air volume ratio of the blown air. Then, a small amount is blown to the defroster opening 15.
[0073]
In the second foot mode, the foot opening 17 is fully opened, the defroster opening 15 is opened by a small opening, and the face opening 16 is closed. And the position of the foot front and rear air distribution door 21 is set to a position where the ventilation path branched to the front seat side foot opening 19 becomes smaller than the ventilation path branched to the rear seat side foot opening 20. Specifically, the air volume ratio of the front seat side foot opening 19 is set to about 40%, the air volume ratio of the rear seat side foot opening 20 is set to about 60%, and the air is blown to the defroster opening 15 by a small amount.
[0074]
Then, as shown in FIG. 13, the second foot mode is set in step S210, and the first foot mode is set in step S211. FIG. 13 is a flowchart showing the operation of the blow mode setting in step S150 in FIG. 6, and the processing up to step S210 and step S211 is the same as the flowchart described in FIG.
[0075]
Next, functions and effects in the third embodiment will be described.
[0076]
During warm-up control when the temperature of the air blown out toward the passenger compartment rises, the air flow rate to the rear seat side passenger feet is increased compared to the air flow rate to the front seat side passenger feet By performing the second foot mode first, it is possible to improve the heating feeling of the rear seat with priority over the front seat.
[0077]
(Other embodiments)
(1) In the first embodiment, the first foot mode and the second foot mode that change the air volume ratio of the blown air blown toward the front seat side occupant feet and the rear seat side occupant feet have been described. Moreover, in 2nd Embodiment, the 2nd foot mode which changed the air volume ratio of the ventilation air which blows off toward a front-seat side passenger | crew step, a rear-seat side passenger | crew step, and the window glass inner surface was demonstrated. When the first and second foot modes in the first embodiment are set in the TAO mode, the second foot mode in the second embodiment may be set by cloudy humidity estimation in the second embodiment.
(2) In the first to third embodiments, the setting of the blowing mode is switched by TAO. However, the setting of the blowing mode may be switched by the engine coolant temperature.
(3) In the first to third embodiments, the setting of the blowing mode is switched by TAO. However, the setting of the blowing mode may be switched by the vehicle interior temperature.
(4) In the first embodiment, the air volume ratio between the front seat side foot opening 19 and the rear seat side foot opening 20 is adjusted by the foot door 17a and the front and rear air distribution doors 21, but the front seat side foot opening 19 is adjusted. The air volume ratio between the rear seat foot opening 20 and the rear seat 20 may be adjusted by one door. For example, the air volume ratio between the front seat side foot opening 19 and the rear seat side foot opening 20 may be adjusted using a dog-shaped air distribution door.
(5) In the first to third embodiments, the description has been given of the plurality of blowing modes for maintaining the air volume ratio at a constant ratio. However, the air volume ratio in each blowing mode may be changed smoothly.
[0078]
Specifically, the amount of air blown from the front seat side foot opening 19 is decreased with the passage of time, and the amount of air blown from the rear seat side foot opening 20 is increased with the passage of time. In the linear foot mode, the amount of air blown from the rear seat side foot opening 20 is decreased with the passage of time, and at the same time, the amount of air blown from the front seat side foot opening 19 is increased with the passage of time. The linear foot mode, the amount of air blown from the front seat side foot opening 19 and the amount of air blown from the rear seat side foot opening 20 are reduced over time, and the amount of air blown from the defroster opening 15 is also reduced over time. It is also possible to execute the third linear foot mode that is increased as time passes.
(6) In the first and third embodiments, the first and second foot modes for blowing air to the front seat occupant feet and the rear seat occupant feet have been described. In the present embodiment, at least a third foot mode in which the rear seat foot opening 20 is closed and air is blown out only from the front seat foot opening 19 can be set. When the passenger is not in the seat, it is determined that the third foot mode is executed when the passenger is not in the rear seat and the target blowing temperature TAO is equal to or higher than a predetermined value. good.
{Circle around (7)} In the second embodiment, the first and second foot modes for blowing air to the front seat occupant feet, the rear seat occupant feet, and the inner surface of the window glass have been described. In the present embodiment, there is a fourth foot mode in which the rear seat side foot opening 20 is closed, air of a predetermined air volume or more is blown out from the front seat side foot opening 19 and air of a predetermined air volume or less is blown out from the defroster opening 15. It can be set at least, and the rear seat occupant determination means determines when no occupant is in the rear seat, and when the occupant is not in the rear seat and the target blowing temperature TAO is predetermined. The fourth foot mode may be executed when the value is equal to or greater than the value and the information value correlated with the fogging state of the window glass is equal to or greater than the predetermined value.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing a configuration of a vehicle air conditioner in a first embodiment.
FIG. 2 is a schematic cross-sectional view showing a state in a first foot mode in the air conditioning unit of the first embodiment.
FIG. 3 is a schematic cross-sectional view showing a state in a second foot mode in the air conditioning unit of the first embodiment.
FIG. 4 is a schematic cross-sectional view showing a state in a bi-level mode in the air conditioning unit of the first embodiment.
FIG. 5 is a schematic cross-sectional view showing a state in the foot / diff mode in the air conditioning unit of the first embodiment.
FIG. 6 is a flowchart showing the operation of the first embodiment.
FIG. 7 is a flowchart showing the operation of step S150 in FIG.
FIG. 8 is an explanatory diagram showing setting a blowing mode based on TAO.
FIG. 9 is a schematic cross-sectional view showing a state in the first foot mode in the air conditioning unit of the second embodiment.
FIG. 10 is a schematic sectional view showing a state in a second foot mode in the air conditioning unit of the second embodiment.
FIG. 11 is a characteristic diagram showing that the blowing mode in the second embodiment is set by TAO and humidity determination.
12 is a characteristic diagram showing that the humidity determination in FIG. 11 is set based on relative humidity.
FIG. 13 is a flowchart showing an operation of blowing mode setting in the third embodiment.
[Explanation of symbols]
7 ... Blower, 12 ... Heat exchanger for heating, 15 ... Defroster opening,
16 ... Face opening, 19 ... Front seat foot opening,
20: Rear seat side foot opening, 77 ... Humidity sensor.

Claims (1)

A blower (7) that blows out air into the passenger compartment;
A heating heat exchanger (12) for heating the blown air of the blower (7);
A front seat foot opening (19) that is provided on the downstream side of the air flow of the heating heat exchanger (12) and blows out the blown air that has passed through the heating heat exchanger (12) toward the feet of the front seat passengers. )When,
A rear-seat-side foot opening (20) provided on the downstream side of the air flow of the heat exchanger for heating (12) and blowing out the blown air toward the rear-seat-side occupant feet;
A defroster opening (15) that is provided on the downstream side of the air flow of the heat exchanger for heating (12) and blows out the blown air toward the inner surface of the window glass;
A first foot mode in which the amount of air blown from the front seat side foot opening (19) is larger than the amount of air blown from the rear seat side foot opening (20);
A total amount of air blown from both the foot openings (19, 20) is reduced compared to the first foot mode, and a second foot mode for blowing a predetermined amount of the blown air from the defroster opening (15) is provided. It ’s at least configurable,
When the information value correlated with the fogging occurrence of the window glass is a predetermined value or more, it is determined that the window glass is close to the fogging situation or the window glass is fogged, and the second foot mode is executed. When the information value is less than a predetermined value, the first foot mode is executed ,
Furthermore, the vehicle air conditioner is characterized in that the first foot mode and the second foot mode are executed only when a target blowing temperature (TAO) of the blowing air into the vehicle compartment is equal to or higher than a predetermined temperature .

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