JP2009035200A - Vehicle air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress deterioration of air-conditioning feeling of an occupant when switching between blowing modes for increasing the rate of the amount of blown air from a face blowing port. <P>SOLUTION: The vehicle air conditioner is provided with an air blower 6 for blowing air into a cabin; the face blowing port 14 for blowing the blown air from the air blower 6 to an upper body side of the occupant in the cabin; a foot blowing port 15 for blowing the blown air from the air blower 6 to a lower body side of the occupant in the cabin; a blowing mode switching means for switching a plurality of blowing modes by switching the ratio of the amount of blown air blown from the face blowing port 14 and the foot blowing port 15; and a blower control means for controlling an amount of blown air by the air blower 6. When the ratio of the amount of blown air of the face blowing port 14 is increased by switching the blowing mode by the blowing mode switching means, the air blower control means reduces the amount of blown air of the air blower 6, and thereafter, the means performs gradual change control for gradually increasing the amount of blown air of the air blower 6 over a predetermined time such that it becomes an amount of blown air before the blowing mode is switched. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to air volume control of blown air at the time of switching a blowing mode in a vehicle air conditioner.

Conventionally, in an auto air conditioner mode in which the interior of a vehicle in a vehicle air conditioner is automatically controlled to a comfortable temperature, the blowout mode is automatically switched along with stabilization of the air condition. The automatic switching of the blowing mode is switched based on the target blowing temperature (TAO) (for example, Patent Document 1). Specifically, the face blowing mode is selected when the target blowing temperature is the low temperature side (cooling side), and the foot blowing mode is selected when the target blowing temperature is the high temperature side (heating side). The bi-level mode is selected in the intermediate temperature range (intermediate region) where the target blowing temperature is between the low temperature side and the high temperature side. Here, the foot blowing mode is a state in which wind is blown out from the foot outlet to the lower body of the occupant, and the face blowing mode is a state in which wind is blown out from the face outlet to the occupant's upper body and face, and the bi-level mode. Is a state in which wind is blown out simultaneously from both the foot outlet and the face outlet.
JP 2006-218958 A

  By the way, in the automatic air conditioner mode, the blower volume of the blower is not necessarily adjusted in conjunction with the automatic switching of the blowout mode. For example, when the blower mode is switched from the foot blow mode to the bi-level mode or the like so that the blown air volume of the conditioned air from the face blower increases, The air volume is increased.

  For this reason, there has been a problem that the amount of blown air blown from the face outlet to the upper body of the occupant or the face suddenly increases after switching the blowing mode, the passenger feels uncomfortable, and the air conditioning feeling deteriorates.

  In view of the above points, an object of the present invention is to suppress deterioration of the air-conditioning feeling of an occupant at the time of blowing mode switching in which the blowing air volume ratio from the face outlet is increased.

  In order to achieve the above object, in the present invention, a blower (6) that blows air into the vehicle interior, a face outlet (14) that blows air blown from the blower (6) toward the upper body side of the passenger in the vehicle interior, The blowing air flow rate ratio of the blown air blown from the foot blower outlet (15) for blowing the blown air from the blower (6) to the lower body side of the passenger in the passenger compartment, the face blower outlet (14), and the foot blower outlet (15) By switching, it is provided with a blow mode switching means for switching a plurality of blow modes and a blower control means for controlling the amount of air blown by the blower (6), and the blower control means is switched by the blow mode switching means. When the blowout air volume ratio at the face outlet (14) increases, the blower (6) blown air volume is decreased, and then the blower (6) blown air volume is switched between the blowout modes. And performing gradual change control which gradually increases over a predetermined time so that before the blast volume being.

  Thereby, when the blowing mode is changed so that the blown air volume ratio of the face blower outlet (14) is increased, the blower volume of the blower (6) is decreased, and then the blower (6) is gradually increased over a predetermined time. By performing the gradual change control for increasing the air flow rate, it is possible to suppress an increase in the air flow rate of the air blown from the face air outlet (14) after switching the blow mode. As a result, it is possible to suppress the deterioration of the air conditioning feeling of the passenger in the passenger compartment after switching the blowing mode.

  Also, the blower control means is a bi-level that blows out blown air from the foot blow mode in which the blow mode blows blown air toward the lower body side of the passenger in the vehicle interior by the blow mode switching means. When the air flow rate of the blower (6) is decreased by switching to the mode, the air flow rate of the blown air from the face air outlet (14) is reduced to the face air outlet (14) and the foot air outlet (15 ) From the face air outlet (14) when switching to the bi-level mode for blowing out the conditioned air can be suppressed.

  Also, the blower control means is a face blowout device that blows out blown air from the bi-level mode in which the blowout mode blows blown air toward the lower body side and upper body side of the passenger in the passenger compartment by the blowout mode switching means. When the air flow rate of the blower (6) is reduced by switching to the mode, from the bi-level mode that blows conditioned air from the face air outlet (14) and the foot air outlet (15), only from the face air outlet (14) An abrupt increase in the amount of air blown from the face air outlet (14) when switching to the face air blowing mode for blowing the conditioned air can be suppressed.

  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.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram of an indoor air conditioning unit of a vehicle air conditioner according to an embodiment of the present invention.

  As shown in FIG. 1, the indoor air conditioning unit 1 is disposed inside an instrument panel (not shown) at the foremost part of the vehicle interior and has an air conditioning case 2 that constitutes an outer shell. An air passage through which air flows toward the vehicle interior is formed inside the air conditioning case 2, and an inside / outside air switching box 3 is disposed at the most upstream part of the air flow.

  The inside / outside air switching box 3 includes an inside air introduction port 3a, an outside air introduction port 3b, and an inside / outside air switching door 4. The inside air introduction port 3 a is an introduction port for introducing inside air (vehicle compartment air) into the air conditioning case 2, and the outside air introduction port 3 b is an introduction port for introducing outside air (vehicle compartment outside air) into the air conditioning case 2. The inside / outside air switching door 4 is disposed inside and outside the inside / outside air switching box 3 so as to be rotatable by a rotating shaft 4 a and is an inside / outside air switching means driven by a servo motor 5.

  Specifically, depending on the rotational position of the inside / outside air switching door 4, an inside air mode for introducing inside air from the inside air introduction port 3a, an outside air mode for introducing outside air from the outside air introduction port 3b, and inside air / Switch to outside air mode.

  On the downstream side of the air flow in the inside / outside air switching box 3, an electric blower 6 that blows air toward the passenger compartment is disposed. The blower 6 rotates a blower fan 6a made of a well-known centrifugal multiblade fan (sirocco fan) by a blower motor 6b to blow air toward the vehicle interior.

  The rotation speed of the blower fan 6a, that is, the amount of blown air into the vehicle is controlled by the applied voltage level BLW (V) applied to the blower motor 6b. The applied voltage level BLW of the blower motor 6b is determined by the air conditioning controller 7 described later. On the downstream side of the air flow of the blower 6, an evaporator 8 that is a cooling heat exchanger for cooling the blown air is disposed.

  The evaporator 8 is one of the elements constituting a refrigeration cycle (not shown), and as is well known, absorbs heat from the blown air blown by the blower 6 when the low-pressure refrigerant flowing into the evaporator 8 evaporates. To cool the blown air. On the downstream side of the evaporator 8, a heater core 9 for heating the air (cold air) after passing through the evaporator 8 is arranged.

  The heater core 9 is a heat exchanger for heating that reheats the air (cold air) that has passed through the evaporator 8 using the engine coolant as a heat source (the engine coolant circuit is not shown). In addition, a bypass passage 10 through which air (cold air) after passing through the evaporator 8 bypasses the heater core 9 and passes through the heater core 9 inside the air conditioning case 2 is formed.

  An air mix door 11 is disposed between the evaporator 8 and the heater core 9. The air mix door 11 is rotatably disposed in the air conditioning case 2 and is driven by a servo motor 13 through an appropriate link mechanism 12 so that its rotational position (opening) can be continuously adjusted. It has become. The servo motor 13 has a built-in potentiometer 13a. The potentiometer 13a detects the rotational position of the servo motor 13 and feeds it back to the air conditioning controller 7 described later.

  Therefore, the air volume ratio between the amount of air passing through the heater core 9 (the amount of hot air indicated by arrow A) and the amount of air passing through the bypass passage 10 (the amount of cold air indicated by arrow B) is adjusted by the opening of the air mix door 11. The The warm air (arrow A) and the cool air (arrow B) are mixed in the heater core 9 side passage and the downstream side of the bypass passage 10 and blown out into the vehicle interior. Adjusted.

  In the most downstream part of the air passage of the air conditioning case 2, a face opening 14 for blowing air-conditioned air toward the upper body and face of the occupant, and a foot opening for blowing air-conditioned air toward the lower body and feet of the occupant There are provided a total of three types of openings, a defroster opening 16 for blowing the conditioned air toward the part 15 and the front window glass of the vehicle.

  A face door 17, a foot door 18, and a defroster door 19 are rotatably arranged at upstream portions of the openings 14 to 16, respectively. These blowout mode doors 17 to 19 are linked mechanisms (not shown). Are opened and closed by a common servo motor (not shown).

  By switching the flow paths of these doors 17 to 19, a face blowing mode in which conditioned air is blown out from the face outlet 14, a foot blowing mode in which the conditioned air is blown out from the foot outlet 15, and the conditioned air in the face outlet 14 and the foot outlet 15. Can be selected from the bi-level mode that blows out the air and the defroster mode that blows out the conditioned air from the defroster outlet 16.

  The face opening 14 is connected to a face outlet 14 (not shown) on the side of the vehicle instrument panel occupant via a face duct (not shown), and the foot opening 15 is connected via a foot duct (not shown). It is connected to a foot outlet 15 (not shown) disposed in the vicinity of the passenger's foot. Further, the defroster opening 16 is connected to a defroster outlet (not shown) on the upper surface of the vehicle instrument panel via a defroster duct (not shown).

  Next, the outline of the electric control unit of the present embodiment will be described. The vehicle air conditioner is provided with an air conditioning control device 7 (ECU) as control means for performing various controls. The air conditioning control device 7 is configured by a known microcomputer including a CPU, a ROM, a RAM, an I / O, and the like, and executes processes such as various calculations according to a program stored in the ROM.

  A sensor detection signal is input from the air conditioning sensor group 20 to the input side of the air conditioning control device 7, and various air conditioning operation switches provided on an air conditioning operation panel 21 (control panel) disposed in the vicinity of the instrument panel in the front of the passenger compartment. An operation signal is input from (not shown).

  Specifically, the air conditioning sensor group 20 includes an outside air sensor that detects the outside air temperature Tam, an inside air sensor that detects the inside air temperature Tr, a solar radiation sensor that detects the amount of solar radiation Ts incident on the vehicle interior, and the air in the evaporator 8. An evaporator temperature sensor that is disposed in the blowing portion and detects the evaporator temperature Te, and a water temperature sensor that detects the engine coolant temperature Tw flowing into the heater core 9 are provided.

  The air-conditioning operation panel 21 has various air-conditioning operation switches: a blow-out mode switch for manually setting a blow-out mode switched by the blow-out mode doors 17 to 19; , An air conditioner switch for outputting an operation command signal for a compressor (not shown), a blower operation switch for manually setting the air volume of the blower 6, an auto switch for outputting a command signal for an air conditioning automatic control state, and a temperature for setting the vehicle interior temperature Tset A temperature setting switch or the like serving as setting means is provided.

  On the output side of the air conditioning control device 7, a blower motor 6 b of the blower 6, a servo motor that constitutes an electric drive means of each device, and the like are connected, and the operation of these devices is controlled by an output signal of the air conditioning control device 7.

  Next, in this embodiment, the control processing of the automatic air-conditioner control which the air-conditioning control apparatus 7 performs is demonstrated based on the flowchart of FIG. It is assumed that at the start of this control routine, the ignition switch of the vehicle engine is turned on to supply power to the air conditioning control device 7, and the air conditioner switch and auto switch of the air conditioning operation panel 21 are on.

  First, in step S10, various flags, timers, etc. are initialized.

  Next, in step S20, the set temperature Tset set by the temperature setting switch of the air conditioning operation panel 21 and the detected values (Tam, Tr, Ts, Te, Tw) of the air conditioning sensor group 20 are read.

Next, in step S30, a target blowing temperature (TAO) of the conditioned air blown into the passenger compartment is calculated based on the following formula F1. Here, the target outlet temperature (TAO) is a temperature necessary for maintaining the passenger compartment at the set temperature Tset.
TAO = Kset × Tset−Kr × Tr−Kam × Tam−Ks × Ts + C (F1)
In Equation F1, Kset, Kr, Kam, and Ks are gains, and C is a correction constant.

  Next, in step S40, the amount of air blown by the blower 6 is determined. The determination of the blast volume in step S40 is determined based on the control map shown in FIG. 3 according to the target blowing temperature TAO calculated in step S30.

  Specifically, the control map shown in FIG. 3 defines the correlation between the applied voltage level BLW applied to the blower motor 6b of the blower 6 and the target blowing temperature TAO. Here, the vertical axis of FIG. 3 is the applied voltage level BLW, and the horizontal axis is the target outlet temperature TAO. This control map is stored in advance in the ROM or the like of the air conditioning control device 7.

  As shown in FIG. 3, the target blowing temperature TAO becomes the low temperature side (cooling side) and the target blowing temperature TAO becomes the high temperature side (heating side), and the applied voltage level BLW increases (the blowing air volume increases). In the intermediate temperature range (intermediate range), the applied voltage level BLW is maintained at a predetermined value (the blown air volume is constant).

  Returning to FIG. 2, in step S50, the foot blowing mode (FOOT), the bi-level mode (B / L), and the face blowing are performed based on the control map shown in FIG. 4 according to the target blowing temperature TAO calculated in step S30. The switching of each blowing mode of the mode (FACE) is determined. Step S50 corresponds to the blowing mode switching means in the present invention.

  In the control map shown in FIG. 4, the correlation between each blowing mode and the target blowing temperature TAO is defined. This control map is stored in advance in the ROM or the like of the air conditioning control device 7.

  Specifically, in the automatic switching of each blowing mode, the face blowing mode is selected when the target blowing temperature TAO is the low temperature side (cooling side), and the foot blowing mode is selected when the target blowing temperature TAO is the high temperature side (heating side). In the intermediate temperature range (intermediate region) where the target blowing temperature TAO is between the low temperature side and the high temperature side, the bi-level mode is selected.

  In step S60, an applied voltage level BLW to the blower 6 when the above-described blowing mode is automatically switched is determined. The process for determining the applied voltage level BLW in step S60 will be described with reference to FIG. Here, FIG. 5 is a flowchart showing a determination process of the applied voltage level BLW at the time of automatic switching of the blowing mode.

  First, in step S600, it is determined whether or not the blowing mode has been automatically switched. Specifically, the automatic switching determination of the blowing mode determines whether or not the blowing mode has been switched from the foot blowing mode to the bi-level mode and from the bi-level mode to the face blowing mode based on the determination result of step S50. judge.

  When the above-described automatic switching of the blowing mode, that is, the automatic switching from the foot blowing mode to the bi-level mode and from the bi-level mode to the face blowing mode is determined, the process proceeds to step S610.

  In step S610, the applied voltage level BLW of the blower 6 calculated in step S50 is reduced by a predetermined level (for example, two levels). Next, in step S620, the status flag F is set to 1 (F = 1). Here, the state flag F indicates that the voltage level BLW applied to the blower 6 has been reduced by a predetermined level.

  Thereby, at the time of switching from the foot blowing mode of the blowing mode to the bi-level mode and from the bi-level mode to the face blowing mode, the amount of air blown from the blower 6 can be reduced.

  In addition, when the above-described automatic switching of the blowing mode, that is, the automatic switching from the foot blowing mode to the bi-level mode and from the bi-level mode to the face blowing mode is not determined in step S50, the process proceeds to step S640.

  In step S640, when the state flag F set in step S620 is set to 1, it is determined whether or not the elapsed time from the blow mode switching is within a predetermined time (for example, 60 seconds). Here, the elapsed time from when the blowing mode is switched is measured by a timer program or the like stored in advance in the ROM or the like in the air conditioning control device 7.

  If it is determined in step S640 that the elapsed time from switching the blowing mode is within a predetermined time, the applied voltage level BLW of the blower 6 reduced in step S610 in step S650 is gradually increased over a predetermined time. The gradual change control is increased.

  For example, when the applied voltage level BLW of the blower 6 is decreased by two levels in step S610, gradual change control is performed in which the level is gradually increased by one level every 30 seconds. In this case, since the decrease amount of the applied voltage level BLW is 2 levels, the predetermined time is 60 seconds.

  Here, the gradual change control in the present embodiment indicates control in which the applied voltage level BLW of the blower 6 is gradually changed stepwise over a predetermined time without changing the applied voltage level BLW to the target voltage level at once.

  If it is determined in step S640 that the elapsed time since switching the blowing mode has exceeded a predetermined time, the state flag F is set to 0 in step S660.

  Here, when the state flag F is 0 in step S630, the applied voltage level BLW of the blower 6 is not set, and the applied voltage level BLW of the blower 6 calculated in step S50 described above is adopted as an output value.

  Thereby, the setting of the applied voltage level BLW of the blower 6 when the automatic switching from the foot blowing mode to the bi-level mode and from the bi-level mode to the face blowing mode is performed.

  Returning to FIG. 2, the target opening degree of the air mix door 11 is calculated in step S70. The target opening degree of the air mix door 11 is based on the target blowing temperature TAO, the evaporator blowing air temperature Te detected by the evaporator temperature sensor, and the engine cooling water temperature Tw detected by the water temperature sensor by the following formula F2. Calculated.

SW = {(TAO−Te) / (Tw−Te)} × 100 (%) (F2)
SW = 0 (%) is the maximum cooling position of the air mix door 11 and fully opens the bypass passage 10 and fully closes the ventilation path on the heater core 9 side. On the other hand, SW = 100 (%) is the maximum heating position of the air mix door 11 and fully closes the bypass passage 10 and fully opens the ventilation path on the heater core 9 side.

  Next, in step S80, an output signal is output from the air conditioning control device 7 to various driving devices such as the blower motor 6b so that the control state calculated in the above steps S30 to S70 is obtained.

  Here, the case where the vehicle air conditioner is controlled with the output value calculated in step S40 (conventional control processing) will be described with reference to FIG. FIG. 6A is a timing chart showing the transition of the target outlet temperature TAO from the high temperature side to the low temperature side, and FIG. 6B shows the transition of the target outlet temperature TAO from the high temperature side to the low temperature side. FIG. 6C is a timing chart showing the applied voltage level BLW to the blower 6 when the target blowing temperature TAO is shifted from the high temperature side to the low temperature side. In addition, FIG. 6D is a timing chart showing the face air volume from the face outlet 14 when the target outlet temperature TAO is shifted from the high temperature side to the low temperature side.

  As shown in FIG. 6, when the target blowing temperature TAO decreases to the first predetermined temperature b, the blowing mode is switched from the foot blowing mode to the bi-level mode by automatically switching the blowing mode (step S50) (FIG. 6 (a ) And (b)).

  The automatic switching of the blowing mode in step S50 is performed because the blowing mode is switched regardless of the applied voltage level BLW to the blower 6 (see FIGS. 6B and 6C). It suddenly increases (see FIG. 6D).

  Further, when the target blowing temperature TAO decreases to the second predetermined temperature a, the blowing mode is switched from the bi-level mode to the face blowing mode by automatically switching the blowing mode (step S50) (FIGS. 6A and 6B). reference). Here too, the face air volume from the face outlet 14 suddenly increases as in the case where the blowing mode is switched from the foot blowing mode to the bi-level mode (see FIG. 6D).

  On the other hand, the case where the vehicle air conditioner is controlled with the output values calculated in steps S40 to S60 (control processing of the present invention) will be described with reference to FIG. FIG. 7A is a timing chart showing the transition of the target blowing temperature TAO from the high temperature side to the low temperature side, and FIG. 7B shows the transition of the target blowing temperature TAO from the high temperature side to the low temperature side. FIG. 7C is a timing chart showing the applied voltage level BLW to the blower 6 when the target blowing temperature TAO is shifted from the high temperature side to the low temperature side. FIG. 7D is a timing chart showing the air volume from the face outlet 14 when the target outlet temperature TAO is shifted from the high temperature side to the low temperature side.

  As shown in FIG. 7, when the target blowing temperature TAO decreases to the first predetermined temperature b, the blowing mode is switched from the foot blowing mode to the bi-level mode by automatically switching the blowing mode (step S50) (FIG. 7 ( a) and (b)).

  Since the blowing mode is automatically switched from the foot blowing mode to the bi-level mode, the voltage level BLW applied to the blower 6 is reduced to a predetermined level. Then, gradual change control is performed in which the applied voltage level BLW is increased stepwise over a predetermined time so as to be the applied voltage level BLW before the automatic switching of the blowing mode over a predetermined time (FIGS. 7B and 7C). )reference).

  Thereby, the blown air from the face blower outlet 14 when switching from the foot blower mode 14 in which the air volume of the blown air from the face blower outlet 14 is small to the bi-level mode in which the conditioned air is blown from the face blower outlet 14 and the foot blower outlet 15. Can be suppressed (see FIG. 7D).

  Further, by performing the gradual change control, an increase in the air volume difference of the conditioned air blown from the face air outlet 14 before and after the switching of the blowing mode can be suppressed, so that the passenger's air conditioning comfort before and after the switching of the blowing mode. Can be secured.

  Further, when the target blowing temperature TAO is lowered to the second predetermined temperature a, the blowing mode is switched from the bi-level mode to the face blowing mode by automatic switching of the blowing mode (step S50) (FIGS. 7A and 7B). )reference).

  Since the blowing mode is automatically switched from the bi-level mode to the face blowing mode, the voltage level BLW applied to the blower 6 is reduced to a predetermined level. Then, gradual change control is performed in which the applied voltage level BLW is increased stepwise over a predetermined time so as to be the applied voltage level BLW before the automatic switching of the blowing mode over a predetermined time (FIGS. 7B and 7C). )reference).

  Thereby, the blown-off air volume of the blown air from the face air outlet 14 when switching from the bi-level mode in which the air conditioned air is blown out from the face air outlet 14 and the foot air outlet 15 to the face air blowing mode in which the air conditioned air is blown out only from the face air outlet 14 Can be suppressed (see FIG. 7D).

  Further, by performing the gradual change control, an increase in the air volume difference of the conditioned air blown from the face air outlet 14 before and after the switching of the blowing mode can be suppressed, so that the passenger's air conditioning comfort before and after the switching of the blowing mode. Can be secured.

  As described above, when the blowing mode is changed so that the blowout air volume ratio of the face blowout port 14 is increased, the rotation speed of the blower 6 is decreased and the rotation speed of the blower 6 is gradually returned. It is possible to suppress an increase in the air volume difference of the conditioned air blown from the face outlet 14 before and after the mode switching. As a result, the passenger's air conditioning comfort before and after switching the blowing mode can be ensured.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be variously modified as follows.

  (1) In the above embodiment, when the blowing mode is switched so that the blown air volume ratio of the face blower outlet 14 is increased, the flow rate of the blower 6 is decreased by a predetermined level, and then the flow rate is increased over a predetermined time. However, the present invention is not limited to this. For example, the gradual change control for continuously (linearly) increasing the air flow rate of the blower 6 over a predetermined time may be performed.

  (2) Moreover, in the said embodiment, in order to change the rotation speed of the air blower motor 6b, the case where the applied voltage level BLW was changed was demonstrated, However, a pulse-form voltage is applied to the air blower motor 6b, and this pulse-shape is applied. It is also possible to use a pulse width modulation (PWM) method in which the pulse width of the voltage is changed to change the rotational speed of the blower motor.

  (3) Moreover, although the said embodiment demonstrated the case of the auto air-conditioner mode by which a blowing mode is automatically switched from a foot blowing mode to a bi-level mode and a bi-level mode to a face blowing mode, it is not limited to this. Absent. For example, in the manual air conditioner mode, the switching of the blowing mode switch of the air conditioning operation panel 21 of the passenger may be applied to the switching to the blowing mode in which the ratio of the blowing air amount from the face outlet 14 is increased.

It is a schematic block diagram of the indoor air-conditioning unit of the vehicle air conditioner which concerns on embodiment of this invention. It is a flowchart which shows control of the air-conditioning control apparatus which concerns on embodiment of this invention. It is a control characteristic figure which shows the relationship between target blowing temperature and the applied voltage level of an air blower. It is a control characteristic figure which shows the relationship between target blowing temperature and blowing mode. It is a flowchart which shows the calculation process of the applied voltage level to the air blower at the time of blowing mode switching which concerns on embodiment of this invention. It is operation | movement explanatory drawing which shows the air volume control of the ventilation air at the time of blowing mode switching of a prior art. It is operation | movement explanatory drawing which shows the air volume control of the blowing air at the time of the blowing mode switching which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Indoor air-conditioning unit, 6 ... Air blower, 6b ... Air blower motor, 7 ... Air-conditioning control apparatus (ECU), 14 ... Face air outlet 14, 15 ... Foot air outlet 15, 20 ... Air-conditioning sensor group, 21 ... Air-conditioning operation panel (Control panel).

Claims (3)

A blower (6) for blowing air into the passenger compartment;
A face outlet (14) for blowing out the air blown from the blower (6) to the upper body side of the passenger in the vehicle interior;
A foot outlet (15) for blowing out the air blown from the blower (6) to the lower body side of the passenger in the vehicle interior;
Blowing mode switching means for switching a plurality of blowing modes by switching the blown air volume ratio of the blown air blown from the face blower outlet (14) and the foot blower outlet (15);
A blower control means for controlling the blown amount by the blower (6),
The blower control means decreases the blown air volume of the blower (6) when the blowout mode is switched by the blowout mode switching means and the blowout air volume ratio of the face air outlet (14) increases. ,
Thereafter, the vehicle air conditioner is configured to perform gradual change control that gradually increases over a predetermined time so as to be the amount of air blown before the blowing mode is switched. The blower control means is configured to blow air from the foot blowing mode in which the blowing mode blows blown air toward the lower body side of the vehicle occupant by the blow mode switching means toward the lower body side and upper body side of the vehicle occupant. 2. The vehicle air conditioner according to claim 1, wherein the air volume of the blower (6) is reduced by being switched to the bi-level mode for blowing out. The blower control means is configured to blow air from the bi-level mode in which the blowing mode blows blown air toward the lower body side and upper body side of the passenger in the vehicle interior by the air outlet mode switching means toward the upper body side of the passenger in the vehicle interior. The air conditioner for vehicles according to claim 1, wherein the air blower (6) is reduced in air volume by being switched to a face blowing mode.

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