JPH106735A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a difference in window defogging performance by increasing the quantity of diffused air in the side of a low temperature more than that in the side of a high temperature when a defrosting command is issued in a device for independently controlling diffusing temperatures from first and second diffusing ports. SOLUTION: While left and right independent control switches 52 are ON, a control circuit 35 controls the opening degree of a driver's seat side air mix door 16DR based on a driver's seat side temperature set by a dial 51DR and a vehicle heat load and the opening degree of a passenger's seat side air mix door 16AS based on a passenger's seat side temperature set by a dial 51AS and a vehicle heat load. Also, the control circuit 35 automatically sets a diffusing port mode based on any one of driver's seat or passenger's seat side temperature and the vehicle heat load. In this case, for example, a wind distribution ration is set such that in the temperatures (diffusing temperatures) set in the driver's and passenger's seat sides, the defroster air quantity of the low side is set larger than that of the high side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner for controlling an outlet temperature based on a vehicle temperature and a set temperature set by an occupant.

[0002]

2. Description of the Related Art A known air conditioner for a vehicle of this type is disclosed, for example, in Nissan Motor's New Vehicle Manual Y33-0 (June 1995). In air-conditioning control, for example, considering that the blowing temperature on the driver's seat side and the passenger's seat side of the vehicle are independently controlled in accordance with the preference of each occupant, the difference in the blowing temperature between the driver's seat side and the passenger's seat side causes defrosting. There is a problem that the window clear performance differs between the driver's seat side and the passenger's seat side.

[0003] It is an object of the present invention to provide a vehicle air conditioner in which the same window clearing performance can be obtained on both the driver's seat side and the passenger's seat side even when air conditioning control is independently performed. .

[0004]

FIG. 1 shows an embodiment of the present invention.
According to the first aspect of the present invention, air is supplied from first and second air outlets including first and second defroster air outlets 19DR and 19AS, respectively, and air from the first and second air outlets. Blowing means 12 for blowing air, and first and second blowing temperature adjusting means 16D for adjusting the blowing temperature of air blown from the first and second blowing ports, respectively.
R, 16AS, and input means 51DR, 51AS for independently inputting the first and second set temperatures in response to a command from the occupant.
And controls the first outlet temperature adjusting means 51DR based on the first set temperature and the vehicle heat load, and controls the second outlet temperature adjusting means 51AS based on the second set temperature and the vehicle heat load. Temperature control means 35, and air amount adjusting means 20DR, 21DR, 22DR: 20A for adjusting the amount of air blown from the first and second air outlets, respectively.
S, 21AS, 22AS, the command means 35 for commanding defrost, and, when the first set temperature is higher than the second set temperature when defrost is commanded, the second defroster outlet 19AS is used. If the blown air amount is larger than the blown air amount from the first defroster outlet 19DR, but the second set temperature is higher than the first set temperature when defrost is commanded, the first Air amount control means 35 for controlling the air amount adjusting means so that the amount of air blown out from the defroster outlet 19DR is larger than the amount of air blown out from the second defroster outlet 19AS;
This solves the above problem. The window clearing performance at the time of defrost depends on the amount of heat from the defroster outlet (defrost heat amount), and the amount of heat depends on the blowout temperature and blown air amount. Further, the blowing temperature depends on the set temperature. Focusing on this, in the present invention, when defrost is commanded,
Because the amount of air blown out from the outlet with the lower set temperature is larger than the amount of air blown out with the higher set temperature,
It is possible to reduce the difference between the amount of heat of the defroster from the first outlet and the amount of heat of the defroster from the second outlet, that is, the difference between the two window clearing performances. According to a second aspect of the present invention, the air amount control means calculates a first heat quantity from a physical quantity corresponding to the temperature of the air blown from the first air outlet and a physical quantity corresponding to the air volume of the air blowing means, and An arithmetic unit for calculating a second heat quantity from a physical quantity corresponding to the temperature of the air blown from the air outlet and a physical quantity corresponding to the air flow rate of the air blowing means; and a blow-out from the first defroster air outlet when a defrost command is issued. A control unit for controlling the air amount adjusting means so that a difference between the air amount and the amount of air blown out from the second defroster outlet is an amount corresponding to the difference between the first heat amount and the second heat amount. According to a third aspect of the present invention, when the non-independent control is commanded, the first and second outlet temperature adjusting means are controlled in the same manner based on a reference set temperature determined from the first and second set temperatures and a vehicle heat load. At this time, the air amount controlling means controls the air amount adjusting means so that the amount of air blown out from the first defroster outlet and the amount of air blown out from the second defroster outlet become the same. . A fourth aspect of the present invention includes the blower, the first and second blowout temperature controllers, an input device, a temperature controller, an air amount controller, and a command device. The air amount control means for controlling the air amount adjusting means so that the defrost heat amount from the first defroster outlet and the defrost heat amount from the second defroster outlet are substantially equal. According to a fifth aspect of the present invention, the first outlet is a driver side outlet that blows air toward the driver's seat side in the vehicle interior, and the second outlet is a passenger seat that blows air toward the passenger side in the vehicle interior. It is a side outlet.

[0005] In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0006]

According to the first aspect of the present invention, in a vehicle air conditioner capable of independently controlling the outlet temperature from the first and second outlets, when a defrost is instructed, the set temperature is lower. Since the amount of air blown from the outlet is set to be larger than the amount of air blown on the side where the set temperature is higher, the difference in window clearing performance can be reduced even when the temperatures of air blown from both defroster outlets are different. In particular, if the present invention is applied to a device capable of independent left and right control, it is possible to reduce a difference in window clear performance between the driver's seat side and the passenger's seat side. A first heat quantity is calculated from a physical quantity corresponding to the temperature of air blown from the first outlet and a physical quantity corresponding to the amount of air blown by the air blowing means, and a physical quantity corresponding to the temperature of air blown from the second air outlet and air blowing means. A second heat quantity is calculated from a physical quantity corresponding to the blown air quantity of the first defroster, and a difference between the quantity of air blown from the first defroster outlet and the quantity of air blown from the second defroster outlet is determined by the first heat quantity and the second heat quantity. The amount of heat corresponding to the difference in the amount of heat of the defrosters from the two defroster outlets, that is, both window clearing performances can be made substantially the same. According to the fourth aspect of the invention, when the defrost command is issued, the amount of defrost heat from the first defroster outlet and the amount of defrost heat from the second defroster outlet are made substantially equal. Similarly, both window clearing performances can be made substantially the same.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of a vehicle air conditioner according to the present invention.
1, a blower fan 12, an evaporator 13, and a heater core 14 are provided. The evaporator 13 constitutes a part of a well-known refrigeration cycle, and cools air by performing heat exchange between air and a refrigerant pumped by a compressor. Reference numeral 15 denotes an intake door for setting an introduction ratio between outside air and inside air.

The air conditioner according to the present embodiment has left and right independent control,
That is, the air conditioning of the driver's seat side and the passenger's seat side can be controlled independently. Therefore, the inside of the air conditioning duct 10 is located immediately downstream of the evaporator 13 from the driver's seat side space 10.
It is partitioned into a DR and a passenger side space 10AS. In the space 10DR, 10AS, the air mix door 16DR,
16AS, vent outlet 17DR, 17AS, foot outlet 18DR, 18AS, defroster outlet 19DR,
19AS and mode doors 20DR, 21DR, 22DR for adjusting the amount of air blown from each air outlet: 20AS, 21A
S and 22AS are provided respectively.

In this embodiment, a vent mode in which air is mainly blown out from the vent outlets 17DR and 17AS by driving the mode door, and the defroster outlets 19DR and 19AS are provided.
Defroster mode that blows air from the vent port 17
DR, 17AS and foot outlet 18DR, 18AS
Bi-level mode (B / L mode) for blowing air from both sides, differential foot mode (D / F mode) and foot mode for blowing air from both the defroster outlets 19DR and 19AS and the foot outlets 18DR and 18AS. Outlet mode can be set. In the normal D / F mode, the ratio (air distribution ratio) between the amount of air blown out from the foot outlet and the amount of air blown out from the defroster outlet is a predetermined reference ratio. In the foot mode, air is blown from the foot outlet and the defroster outlet. However, the reference air distribution ratio of the foot outlet is larger than that in the D / F mode. Note that the foot door 20 and the defroster door 21 are linked with each other, and the larger the defroster door opening, the smaller the foot door opening.

When the blower fan 12 is driven, outside air or inside air is introduced into the air-conditioning duct 10 from the air introduction port 11, and after being cooled by the evaporator 13,
DR, 10AS. Each space 10DR, 10AS
The air guided to the air mixing door 16D
The remaining amount passes through the heater core 14 by an amount corresponding to the opening degree of R and 16AS, and the rest is bypassed by the heater core 14 and mixed again. Thereby, the temperature-controlled air is blown out from each outlet into the vehicle interior. Outlet 17DR, 18DR, 19D
The air from R is blown to the driver's seat side, and the outlets 17AS,
Air from 18AS and 19AS is blown to the passenger seat side.

Reference numeral 31 denotes an intake door actuator for driving an intake door, 32 denotes a power transistor for driving a blower fan, 33DR and 33AS denote air mix door actuators for driving the air mix doors 16DR and 16AS, respectively, and 34 denotes a mode door drive. Mode door actuators, which are connected to the control circuit 35.

The control circuit 35 also includes an indoor temperature sensor 41 for detecting the temperature inside the vehicle, an outside air temperature sensor 42 for detecting the outside air temperature, and a solar radiation sensor 43D for detecting the amount of solar radiation on the driver's seat side.
R, a solar radiation sensor 43AS for detecting the amount of solar radiation on the passenger seat side, and an intake sensor 44 for detecting the air temperature downstream of the evaporator. Reference numeral 50 denotes various operating members provided in the driver's cab, and a driver's seat set temperature dial 51DR for adjusting the driver's seat set temperature, a passenger seat set temperature for adjusting the passenger's seat set temperature. It includes a dial 51AS, a left and right independent control switch 52 for instructing whether or not to perform left and right independent control. The driver's seat side set temperature dial 51DR is arranged on the driver's seat side so as to be easily operated from the driver's seat, and the passenger side set temperature dial 51AS is arranged on the passenger's seat side so as to be easily operated from the driver's seat.

The operation of the vehicular air conditioner configured as described above will be described. When the left / right independent control is not commanded (for example, the left / right independent control switch 52
Is off), the driver's seat side set temperature set by the dial 51DR is set as a reference set temperature, and the reference set temperature and the detection output of the indoor temperature sensor 41, the outside air temperature sensor 42, the solar radiation sensors 43DR and 43AS, that is, Based on the vehicle heat load, both the driver-side and passenger-side air mix doors 16DR, 16AS are similarly controlled. Therefore, the temperature of the air blown into the passenger compartment is equal on the driver seat side and on the passenger seat side.

On the other hand, when the left and right independent control is commanded (for example, when the left and right independent control switch 52 is turned on), the control circuit 35 determines the driver's seat set temperature set by the dial 51DR and the vehicle heat. While controlling the opening degree of the driver's seat side air mix door 16DR based on the load, the passenger seat side set temperature set by the dial 51AS,
And the opening degree of the passenger side air mix door 16AS is controlled based on the vehicle heat load. Therefore, when the driver's seat side set temperature and the passenger's seat side set temperature are different, the temperature of air blown into the vehicle compartment is different between the driver's seat side and the passenger's seat side.

The control circuit 35 drives the mode door actuator based on either the driver's seat side or the passenger's seat set temperature and the vehicle thermal load, and automatically sets the outlet mode. Normally, the air outlet mode is the same on the driver's seat side and the passenger's seat side regardless of the presence or absence of the left and right independent control, but the air blowing mode from both the defroster air outlet and the foot air outlet (D / F mode and In the foot mode), the blowing air amount is controlled independently. That is, in the left and right independent control, the blowout temperature may be different between the driver's seat side and the passenger's seat side. Therefore, if the amount of air blown out from the defroster outlet is the same, the window clear performance differs between the driver's seat side and the passenger's side. This is an undesirable state.

To prevent this, the defroster air amount on the side of the driver's seat side and the passenger's seat side with the lower set temperature (blowing temperature) should be larger than that on the higher set temperature side. Therefore, in the present embodiment, when the set temperatures on the driver's seat side and the passenger's seat side are different during the left and right independent control, and the D / F mode or the foot mode is selected, the driver's seat side and the passenger's seat side are selected. For the higher set temperature, set the air distribution ratio between the defroster outlet and the foot outlet to a predetermined reference value, and for the lower set temperature, the air volume from the defroster outlet is smaller than the air volume when the reference value is set. The air distribution ratio is set so as to increase the number. Although the details of the air distribution ratio setting will be described later, the amount of heat (defroster heat) contributing to defrost can be made substantially the same between the driver's seat side and the passenger seat side. The same window clear performance can be obtained.

FIGS. 2 to 4 show flowcharts for realizing the above-mentioned operation. This program shows the outlet control executed by the control circuit 35, and is periodically called from a main program (not shown). First, in step S1, it is determined whether an off switch (not shown) is on or off. If the switch is on, that is, if the air conditioner is not operated, the foot mode is fixed in step S2.

If the off switch is off, step S3
Then, it is determined whether or not the manual air volume changeover switch (mode switch) is operated. If the operation has been performed, the process proceeds to step S4, and the outlet mode according to the operation is set. That is, one of the above-described vent mode, foot mode, defroster mode, B / L mode, and D / F mode is selected according to the operation of the air volume change switch, and the mode door actuator 34 is set so that the mode is set. The mode door is driven and controlled through the switch. If the mode switch has not been operated, the process proceeds to step S5, where it is determined whether a defroster switch (not shown) is on or off. If the defroster switch is on, step S6
To fix to defroster mode. That is, in this embodiment, since the left and right independent control is not performed when the defroster switch is turned on, the defroster mode (all air is blown out from the defroster outlet) is set on both the driver's seat side and the passenger's seat side.

On the other hand, if the defroster switch is off, the process proceeds to step S7 to automatically set the outlet mode, and a value Q'SU obtained by performing a predetermined process on the detection output of the solar radiation sensor 43
N is input, and in step S8, a solar radiation correction value hQ'SUN corresponding to Q'SUN is obtained from the characteristics shown. Step S9,
In step 10, the normal target outlet temperature XM and the target outlet temperature XD (both on the driver's seat side) are corrected by the following formula.

XM = S + (FX * G) * (Two-TINT) + TINT XD = S + (FX * G) * (Two-TINT) + TINT
-HQ'SUN In the above equation, S is an amount corresponding to the difference between the target outlet temperature and the actual outlet temperature (determined from the driver's seat side set temperature and the vehicle heat load in the air mix door control not shown),
X is the air mix door opening, TINT is the suction temperature detected by the intake sensor 44, and Two, F, and G are constants.

In step S11, it is determined whether venting or B / L from the characteristics shown in FIG.
Then, B / L or D / F is determined based on XD. In the case of venting, the process proceeds from step S13 to step S14, where the vent mode is set for both the driver's seat and the passenger seat, and B / B
In the case of L, the process proceeds from step S15 to step S16 to set the B / L mode similarly.

On the other hand, in the case of the D / F, the process proceeds to step S17 to determine whether the mode is the D / F mode or the foot mode, and the state 1 or 2 is determined based on the XM based on the characteristic shown in FIG. Here, I in step S11 and L in step S17 satisfy the relationship of I <L. In the case of state 1, the process proceeds from step S18 to step S21 to turn off the D / F flag, and in the case of state 2, the process proceeds to step S19. In step S19, based on the outside air temperature TAM, D /
F or foot, and if foot, step S2
The program proceeds to 1 to turn off the D / F flag, and in the case of D / F, turns on the D / F flag in step S22.

In step S23, it is determined whether the left and right independent flags are on or off. The left / right independent flag is turned on, for example, when the left / right independent switch 52 is turned on. When the left / right independent flag is off, that is, when the left / right independent control is not performed, the process proceeds to step S24 to perform the normal control, and the on / off of the above-described D / F flag is determined. If it is on, the D / F mode is set in step S25, and if it is off, the foot mode is set in step S26.
In the D / F mode and the foot mode, as described above, the ratio (air distribution ratio) between the amount of air blown out from the foot air outlet and the amount of air blown out from the defroster air outlet is a predetermined ratio (driver seat). Side and the passenger seat side).

If the left / right independent flag is on, that is, if left / right independent control is to be performed, the process proceeds to step S27, in which the driver's seat side set temperature TPTCDR and the passenger's seat side temperature set dial set by the driver's seat side temperature setting dial 51DR. 51AS
It is determined whether or not the passenger side set temperature TPTCAS set in the above is equal. If TPTCDR = TPTCAS, the process proceeds to step S24 to perform normal control, and TPTCDR ≠ TPTC
If it is AS, the process proceeds to step S28 to independently control the air distribution ratio between the defroster outlet and the foot outlet.

In step S28, the set temperatures TPTCDR, TP
The magnitude of TCAS is determined, and if TPTCDR> TPTCAS, the process proceeds to step S29, where the air distribution ratio between the defroster outlet and the foot outlet on the driver's seat side is determined in step S25 or S25.
The reference air distribution ratio in the normal D / F mode or the foot mode set in 26 is set. Which of the reference air distribution ratios, D / F and foot, is used depends on the on / off state of the D / F flag.

Next, the process proceeds to step S30 to determine the air distribution ratio on the passenger side, and the difference Q between the heat quantity QDR on the driver side and the heat quantity QAS on the passenger side is obtained. The driver side heat quantity QDR is obtained from the driver side target blowout temperature and the blower fan applied voltage (corresponding to the blower fan airflow), and the passenger side heat quantity QAS is obtained from the passenger seat side target blowout temperature and the blower fan applied voltage. . The above-described XM may be used for the driver-side target outlet temperature, and the passenger-side target outlet temperature is calculated by the same formula as that for XM (using the passenger-side set temperature instead of the driver-side set temperature). A value may be used.

In step S31, the characteristic shown by the solid line or the broken line is selected according to the on / off state of the D / F flag.
The defroster door opening on the passenger seat side, that is, the side on which the set temperature is lower, is selected based on Q from the selected characteristics. And
The defroster door is driven via the mode door actuator to reach the opening. As described above, since the defroster door and the foot door are linked, the foot door opening is automatically determined by the determination of the defroster door opening, and the air distribution ratio is set.

The characteristics of step S30 are set so that the amount of heat from the passenger side defroster outlet 19AS is substantially equal to the amount of heat from the driver seat side defroster outlet 19DR. Therefore, the opening degree of the defroster when Q is zero is an opening degree according to the reference air distribution ratio, and the opening degree of the defroster door increases as Q increases, that is, the amount of air blown out from the defroster outlet increases.

On the other hand, at step S28, TPTCDR <TPTCAS
When it is determined that the above-described processing has been performed, the processing reverse to that described above is performed in steps S32 to S34. That is, the air distribution ratio between the defroster outlet and the foot outlet on the passenger side is set to a normal D
/ F mode or foot mode reference air distribution ratio, and the heat quantity QAS on the passenger side and the heat quantity QDR on the driver side
The defroster door opening on the driver's seat side, that is, the side on which the set temperature is lower, is selected based on Q from the same characteristics as described above.

In the configuration of the above embodiment, the blower fan 12 functions as a blower and the air mix door 16DR,
16AS constitutes the first and second outlet temperature adjusting means, the dials 51DR and 51AS constitute input means, and the control circuit 35 constitutes temperature control means, air amount control means and command means.

When the defrost command is issued, the amount of air blown from the outlet with the lower set temperature may be made larger than the amount of air blown with the higher set temperature. Is not limited to

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a vehicle air conditioner according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of the air conditioner.

FIG. 3 is a flowchart following FIG. 2;

FIG. 4 is a flowchart following FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Air-conditioning duct 11 Air inlet 12 Blower fan 13 Evaporator 14 Heater core 16DR, 16AS Air mix door 17DR, 17AS, 18DR, 18AS, 19DR,
19AS outlet 33DR, 33AS air mix door actuator 35 control circuit 41 indoor temperature sensor 42 outside air temperature sensor 43DR, 43AS solar radiation sensor 51DR, 51AS temperature setting dial 52 left and right independent control switch

Claims (5)

[Claims] 1. A first and second air outlet including first and second defroster air outlets, respectively, an air blower for blowing air from the first and second air outlets, and the first air outlet. And first and second outlet temperature adjusting means for adjusting the outlet temperature of the air blown from the second outlet, respectively, and an input for independently inputting the first and second set temperatures in accordance with an occupant's command. Means for controlling the first blowout temperature adjusting means based on the first set temperature and the vehicle heat load, and the second blowout temperature adjusting means based on the second set temperature and the vehicle heat load. Temperature control means for controlling air flow, air amount adjustment means for adjusting the amount of air blown from the first and second outlets, command means for instructing defrost, and said first command when defrost is commanded. Set temperature When the temperature is higher than the second set temperature, the amount of air blown out from the second defroster outlet becomes larger than the amount of air blown out from the first defroster outlet, and the defrost is commanded. When the second set temperature is higher than the first set temperature, the amount of air blown from the first defroster outlet is larger than the amount of air blown from the second defroster outlet. Air conditioner for controlling the air amount adjusting means. 2. The air amount control means calculates a first heat quantity from a physical quantity corresponding to the temperature of air blown from the first air outlet and a physical quantity corresponding to the air volume of the air blower means, and calculates the first heat quantity. 2 from the physical quantity corresponding to the temperature of air blown from the outlet 2 and the physical quantity corresponding to the amount of air blown by the blowing means.
A difference between the amount of air blown out of the first defroster outlet and the amount of air blown out of the second defroster outlet when the defrost is instructed. 2. The vehicle air conditioner according to claim 1, further comprising: a control unit that controls the air amount adjusting unit so that the air amount is adjusted according to a difference between the heat amount and the second heat amount. 3. 3. The temperature control means according to claim 1, wherein said non-independent control is commanded, said first and second blow-outs being based on a reference set temperature determined from said first and second set temperatures and said vehicle heat load. The temperature control means is controlled to be the same, and at this time, the air amount control means controls the air amount from the first defroster outlet to be the same as the air amount from the second defroster outlet. The vehicle air conditioner according to claim 1, wherein the air amount adjusting unit is controlled. 4. A first and second air outlet including first and second defroster air outlets, respectively, an air blower for blowing air from the first and second air outlets, and the first air outlet. First and second outlet temperature adjusting means for adjusting the temperature of air blown from the second outlet and input means for independently inputting the first and second set temperatures in response to a command from an occupant; Controlling the first blowout temperature adjusting means based on the first set temperature and the vehicle heat load, and controlling the second blowout temperature adjusting means based on the second set temperature and the vehicle heat load; Temperature control means, air amount adjustment means for adjusting the amount of air blown from the first and second air outlets respectively, command means for instructing defrost, and when the defrost is instructed, the first of An air conditioner for a vehicle, comprising: air amount control means for controlling the air amount adjusting means so that the amount of defrost heat from the froster outlet is substantially equal to the amount of defrost heat from the second defroster outlet. apparatus. 5. The driver according to claim 1, wherein the first outlet is a driver-side outlet that blows air toward a driver seat in the passenger compartment, and the second outlet is an assistant that blows air toward a passenger seat in the passenger compartment. The vehicle air conditioner according to any one of claims 1 to 4, wherein the air conditioner is a seat side outlet.