JP3274173B2 - Vehicle air conditioner control method and control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower, a heat exchanger for cooling, a heat exchanger for heating, and an air cooled by the heat exchanger for cooling in a ventilation duct for sending air into a vehicle interior. The present invention relates to a control method and a control device for a vehicle air conditioner having an air mix damper for adjusting a temperature of air blown into a vehicle cabin by adjusting a ratio of air flow to a heating heat exchanger.

[0002]

2. Description of the Related Art Generally, in order to maintain the interior temperature of a vehicle at a desired comfortable temperature by an air conditioner, control is performed in consideration of the heat balance in the interior of the vehicle as described below. For example, considering the thermal aberration inside and outside the vehicle cabin based on the cooling state, the heat exchange capacity of the air conditioner is Qa,
Assuming that the heat transfer load due to the temperature difference between the inside and the outside of the vehicle is Qu, the heat load due to solar radiation is Qs, the heat load from the occupant is Qm, and the heat load from the engine or the like is Qe, the following equation is established.

Qa = Qu−Qs−Qm−Qe (1) Here, Qa = Cp · γ · Va (To−Tr) Qu = K · F (Tr−Ta) Qs = Ks · Ts In addition, Va is a blown air amount of a blower, To is a blown air temperature into a vehicle compartment, Tr is a vehicle room temperature (that is, a suction air temperature into a ventilation duct), Ta is an outside air temperature, Ts is a temperature conversion value of a solar radiation amount, Cp is the specific heat of the air at a constant pressure, γ is the specific gravity of the air,
K is the heat transmission coefficient, F is the heat transfer area, and Ks is the solar radiation-temperature conversion coefficient.

Further, Qm and Qe are assumed to be approximately constant, and Qm + Qe = C (constant).
Substituting equation (1) into equation (1), Cp · γ · Va (To−Tr) = K · F (Tr−Ta)
−Ks · Ts−C (2). Now, assuming that the vehicle interior temperature Tr has reached the set temperature Tset, the above equation (2) can be expressed as: Cp · γ · Va (To−Tset) = K · F (Tset
−Ta) −Ks · Ts−C (3)

Therefore, if the blown air amount Va and the blown air temperature To of the blower are controlled so as to satisfy the above equation (3), the vehicle interior temperature Tr can be kept close to the set temperature Tset. , The two unknowns Va, To cannot be uniquely calculated. Therefore, the relationship between the environmental conditions such as the outside air temperature and the amount of air blown from the blower is determined in advance,
The blower air volume of the blower is preferentially determined according to the detected environmental conditions, and the blowout air temperature required to maintain the vehicle interior temperature close to the set temperature is calculated based on the blower air volume, and the air mix damper is calculated. Has been proposed to control the opening degree of the blower to obtain the blown air temperature (for example, Japanese Patent Publication No.
No. 2-8327).

In the case of the above-mentioned known example, the amount of air blown from the blower is preferentially determined, and the temperature of the blown air is calculated based on this priority. The air temperature may deviate significantly from the comfortable temperature. Then, in the case where the occupant rides in the vicinity of the air outlet as in a vehicle air conditioner, the blowout air directly hits the occupant, which may cause discomfort to the occupant.

In order to cope with the above-described problems, the temperature of the blown air is set as desired by the occupant, and the amount of heat required to maintain the vehicle interior temperature close to the set temperature under the set blown air temperature is obtained. In addition to controlling the amount of air blown from a blower, the opening degree of an air mix damper is controlled so as to obtain the set air temperature (for example, Japanese Patent Application Laid-Open No. 1-120117). reference).

However, in the case of the above two known examples,
In any case, after determining the blown air amount of the blower, a method of calculating the blown air temperature corresponding to the blown air amount is adopted. Therefore, factors (for example, environmental conditions or set blown air temperature) for determining the blown air amount are used. When an error or the like occurs, the comfort due to the occupant's bodily sensation may be impaired. For example, if the amount of blown air is too strong, there is a possibility that even when the temperature of the blown air is slightly high, the body feels cold, and if the amount of blown air is too weak, the air may feel hot even if the temperature of the blown air is low.

[0009]

The inventors of the present invention have determined that the comfort level as the occupant's bodily sensation is based on the blowing air temperature To,
It has been discovered that it can be expressed as a comfort index F by the blown air volume Va and environmental conditions (for example, the outside air temperature Ta, the vehicle interior temperature Tr, etc.). The comfort index F is, for example, F = 1.
If F is an index that the occupant feels hot and F = 9 is an index that the occupant feels hot, F = 5 can be expressed as an index that the occupant feels comfortable.

The comfort index F can be calculated using the following equation (comfort characteristic equation) obtained by a multiple regression equation from a feeling evaluation experiment. _{F = K 1 · Va + K} 2 · To + K 3 · Ta + K 4 · Tr
+ _K 5 · Ts (4) where _K 1 ~K ₅ is a proportionality constant, Summer (i.e., during cooling) and the case of calculating the comfort index ^{F 2} in, Winter (i.e., heating at) Comfort in changes in the case of calculating the index F _4. As shown in FIG. 4, in the summer, the vehicle interior shifts from a state where the passenger compartment feels hot (ie, the comfort index F = 9) to a state where the passenger compartment feels comfortable (ie, the comfort index F = 5), and in the winter, From the state where the vehicle interior is cold (ie, the comfort index F = 1) to the state where the passenger feels comfortable (ie,
From the transition to the comfort index F = 5), the proportionality constants K _{1 to} K for calculating the comfort index F are calculated in summer and winter.
₅ needs to be changed.

For example, a description will be given of a case where the vehicle interior temperature is maintained comfortably in a cooling state. As shown in FIG. 5, the correlation between the blown air amount Va and the blown air temperature To, that is, Qa = Cp.gamma.Va (To) −Tr) is To = Tse
Since an inverse proportional curve with t and Va = 0 asymptote is obtained, the blown air volume Va is changed from a low air volume to a high air volume at predetermined steps (that is, ΔVa) for each of the blown air volumes Va ₁ to Va ₁ .
The outlet air temperatures To _{1 to} To ₇ corresponding to Va ₇ are obtained,
These airflow volume _Va 1 to VA ₇ and outlet air temperature To ₁
The combination of ～To _7, respectively By substituting the above equation (4), airflow volume _Va 1 to VA ₇ and outlet air temperature To
Comfort correspond to _{1 ~To 7} Index _F 2 = 7 to 1
Is obtained. _{Then, |} F 2 -5 _| airflow volume that is minimized Va = Va ₃ and outlet air temperature To =
As a combination of the To _3, by controlling the opening degree of the output and the air mixing damper of the air blower, and thus can maintain the cabin temperature in the passenger comfort temperature.

The present invention has been made in view of the above points, and expresses the degree of comfort felt by an occupant as an index. It is an object of the present invention to provide a control method and a control device for a vehicle air conditioner which can comfortably maintain the temperature in a vehicle compartment by controlling according to a heat load generated in the vehicle.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a fan, a cooling heat exchanger, a heating heat exchanger, and a cooling fan in a ventilation duct for sending air into a vehicle cabin. A method of controlling an air conditioner for a vehicle having an air mix damper that adjusts a ventilation rate of air cooled by a heat exchanger for heating to a heat exchanger for heating to adjust a temperature of air blown into a vehicle cabin. A correlation between the blown air temperature obtained based on a heat balance equation required to maintain the temperature at a predetermined temperature and the blown air amount of the blower, and at least an outside air which is a parameter related to a heat load generated in the vehicle interior. An index calculated by various parameters including a temperature, a vehicle interior temperature, and an outlet air temperature and an outlet air volume, and a comfort index indicating the comfort of the occupant is obtained, and a combination of the outlet air temperature and the outlet air volume is obtained. Of cause, the selecting a combination of the comfort index is closest to the optimum value according to the heat load generated in the vehicle interior, most approaches combined optimum value 2
When the heat load generated in the vehicle interior is equal to or more than a predetermined value, a combination with a large amount of blown air is selected, and when the heat load is equal to or less than a predetermined value, a combination with a small amount of blown air is selected. It is characterized in that the opening degree of the air mix damper and the output of the blower are controlled by a combination of the air flow and the blown air amount.

The present invention also provides a fan, a cooling heat exchanger, a heating heat exchanger, and a heater for heating air cooled by the cooling heat exchanger in a ventilation duct for sending air into the vehicle interior. A control unit for a vehicle air conditioner having an air mix damper for adjusting the ratio of ventilation to the heat exchanger for adjusting the temperature of air blown into the vehicle interior. First calculating means for obtaining a correlation between the blown air temperature obtained based on a heat balance equation and the blown air amount of the blower; and an outside air temperature and a vehicle interior temperature which are at least parameters related to a heat load generated in the vehicle interior. A second calculating means for obtaining an index of comfort, which is an index calculated based on various parameters including the blown air temperature and the blown air volume and indicating the comfort level of the occupant, and the comfort calculated by the second calculating means. Among the combinations of the blown air temperature and the blown air amount in the index, the combination in which the comfort index approaches the optimum value is selected according to the heat load generated in the vehicle interior, and there are two combinations closest to the optimum value. In the case, when the heat load generated in the vehicle interior is equal to or more than a predetermined value, a combination with a large amount of blown air is selected, and when the heat load is equal to or less than a predetermined value, a combination with a small amount of blown air is selected. Control means for controlling the opening degree of the air mix damper and the output of the blower according to a combination of the blown air temperature and the blown air amount is provided.

[0015] In the present invention, the heat load generated in the vehicle interior may be the amount of solar radiation. In the present invention configured as described above, the correlation between the blown air temperature and the blown air amount of the blower obtained based on a heat balance equation required to maintain the vehicle interior temperature at a predetermined temperature, Determine a comfort index, which is an index calculated by various parameters including at least the outside air temperature and the cabin temperature and the blow-out air temperature and the blow-off air volume, which are parameters related to the heat load generated in the vehicle cabin, When the comfort index is selected in accordance with the heat load generated in the vehicle cabin so as to be a combination of the blow-off air volume and the blow-off air temperature at which the optimum value is the optimum value, and when there are two combinations that are closest to the optimum value, When the heat load generated in the vehicle interior is equal to or more than a predetermined value, a combination with a large amount of blown air is selected. Of the combination of the selected outlet air temperature and airflow volume becomes the output of the opening and the blower of the air mixing damper is controlled, the vehicle interior temperature can be approached maintaining a comfortable temperature.

Further, since a combination of the amount of blown air and the temperature of blown air is selected according to the amount of solar radiation, a more comfortable feeling can be given to the occupant.

[0017]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 2, reference numeral 1 denotes a ventilation duct, and at an upstream end of the ventilation duct 1, an outside air inlet 2 is provided.
An air inlet 3 for introducing air in the vehicle compartment and an inside / outside air switching damper 4 for selectively opening the two inlets 2 and 3 are provided, while a vent outlet 5 is provided at a downstream end of the ventilation duct 1. , A foot outlet 6, a defroster outlet 7, and three cord switching dampers 8, 9, 10 for guiding air to these outlets 5, 6, 7.

On the upstream side in the ventilation duct 1,
A blower 11 is provided, and the air introduced from one of the inlets 2 and 3 by the operation of the blower 11 is passed through the ventilation duct 1 from one of the outlets 5, 6, and 7 to the vehicle interior. It is made to blow out to. Further, inside the ventilation duct 1, a cooling heat exchanger 12 is provided downstream of the blower 11, and a heating heat exchanger 14 is provided downstream of the cooling heat exchanger 12 via an air mix damper 13. The operation of the air mix damper 13 adjusts the ratio of the amount of air to the heating heat exchanger 14 to the amount of air bypassing the same. For example, the opening degree θ of the air mix damper 13 is set to 1 when the rate of ventilation to the heating heat exchanger 14 becomes 100%, and set to 0 when the rate of ventilation to the heating heat exchanger 14 becomes 0%. As a result, the blown air temperature To can be continuously adjusted between the maximum temperature obtained when θ = 1 and the minimum temperature obtained when θ = 0. In addition, the air mixing damper opening degree θ is expressed by Te as the outlet temperature of the cooling heat exchanger 12 and Tw as the engine cooling water temperature.
Then, it is given by the following equation.

Θ = (To−Te) / (Kw · Tw−Te) (5) where Kw is the temperature of the engine cooling water and the heat exchanger 1 for heating.
4 is a coefficient for converting to the outlet temperature. The cooling heat exchanger 12 includes a compressor 15, a condenser 16,
An evaporator is provided in the refrigerant circuit X including the receiver 17, and the compressor 15 is connected to the engine 18
The operation is controlled by ON / OFF of an electromagnetic clutch connected to.

The heating heat exchanger 14 includes an engine 18
The cooling water is passed through the heater core, and the operation is controlled by opening and closing a valve (not shown) controlled together with the air mix damper 13. In the drawings, reference numeral 19 denotes a motor serving as a driving source of the inside / outside air switching damper 4, reference numeral 20 denotes a motor serving as a driving source of the dampers 8, 9, and 10, reference numeral 21 denotes a servomotor serving as a driving source of the air mix damper 13, and reference numeral 22 denotes A control circuit including a microcomputer for controlling the motors 19, 20, and 21 and the blower 11, and 23 includes various switches (for example, an auto switch 2)
3a, an operation panel provided with a vehicle interior temperature setting switch 23b, an inside / outside air changeover switch 23c, a blowing mode changeover switch 23d, a defroster switch 23e, and the like, and 24 is a vehicle interior temperature (in other words, the air drawn into the ventilation duct 1). Temperature) Room temperature sensor for detecting Tr, 25 is outside air temperature Ta
, An insolation sensor 26 for detecting the amount of insolation, and 27 an outlet temperature Te of the cooling heat exchanger 12.
Is a water temperature sensor that detects the temperature of the engine cooling water, and 29 is a potentiometer that detects the position of the air mix damper 13.

The amount of air blown by the blower 11 (in other words, the amount of blown air) Va is controlled by a blower motor 11a as its driving source.
The air mix damper 13 is controlled so that the opening θ detected by the potentiometer 29 by the servo motor 21 controlled by the control circuit 22 becomes a predetermined value. Is controlled.

The control circuit 22, as shown in FIG.
Signals from the sensors 24 to 29 and the operation panel 23
(Hereinafter referred to as a CPU) 30 for receiving a switch signal from the CPU 30 and outputting display data to the operation panel 23. The motors 19, 20, 21 and the blower are provided based on an output signal from the CPU 30. Blower motor 11a, compressor 15 and engine 18
To control the electromagnetic clutch 31 interposed between them. FIG.
In the figure, reference numeral 32 denotes a stabilized power supply, 33 denotes a D / A converter, and 34 to 38 denote drivers.

The control circuit 22 changes the vehicle interior temperature Tr to a set temperature Tse, as shown in the function correspondence diagram of FIG.
t required to maintain the temperature [ie, Cp ·
γ · Va (To−Tset) = K · F (Tset−T
a) -Ks.Ts-C], a first calculating means 40 for obtaining a correlation between the blown air temperature To and a blown air amount Va obtained based on [Ks.Ts-C], and a blown air temperature To related to a heat load generated in the vehicle interior. and comfort index a index calculated by various parameters including the airflow volume Va represents the passenger comfort _{F (= K 1 · Va +} K 2 · to + K 3 · Ta + K 4 ·
A second calculation means 41 for obtaining the Tr + K 5 · _Ts), among the combinations of the outlet air temperature To and the airflow volume Va in comfort index F obtained by the second calculating means 41, the comfort index F is optimum A selection means 42 for selecting a combination closest to a value (for example, F = 5), and an opening degree θ of the air mix damper 13 based on a combination of the blown air temperature To and the blown air amount Va selected by the selection means 42. Control means 43 for controlling the output of the blower 11;

Next, with reference to flowcharts shown in FIGS. 6 to 10, a control mode in the vehicle air conditioner according to the present embodiment will be described. S in each flowchart
And SS indicate each step. Heat load Q generated in the passenger compartment at step _{S 1} in FIG. 6 [= K · F (To
−Ta) −Ks · Ts−C]. Here, when it is determined that Q ≦ 0, the cooling operation is required, and when it is determined that Q> 0, the heating operation is required.

[0025] If it is determined that Q ≦ 0 in step S _1, after without a vent mode allowed opening operation only the motor switching damper 8 in step S _2, the set temperature of the vehicle interior temperature Tr in step S ₃ Heat exchange capacity Qa [= K · F (Tset−T
a) Calculate −Ks · Ts−C + Ki (Tset−Tr)]. Here, Ki is the heat capacity of the vehicle body. Only after
Step _S 4 _{to S 14} Teikazeryou V the airflow volume Va in
separated at every predetermined sum airflow ΔVa from al to large air flow Vah, the blowout air temperature To of the time, the air mixing damper opening theta, comfort index _{F 2} and _| calculates the | F 2 -5.

[0026] That is, Va = Val in step _{S 4}
And decide ,, if it is determined that Va <Vah in step _{S 5,} blowout air temperature To in step _{S 6}
[= (Qa / Cp · γ · Va) + Tr] is calculated, and the air mixing damper opening degree θ in step _{S 7} [= (To
−Te) / (Kw · Tw−Te)]. The calculation up to this point is performed by the first calculation means 40 in the control circuit 22. Then, when it is determined that theta ≦ 0 in step S ₈ (i.e., if the air mixing damper 13 is switched to the air volume of the heating heat exchanger 14 to 0%), the step S and to = Te in ₉ (i.e., replacing the outlet air temperature to at the outlet temperature Te of the cooling heat exchanger 12), in step _{S 8 θ>} 0
If it is determined that (that is, when the air mixing damper 13 is also switched so as to air to the heating heat exchanger 14), and the To = the To in step S ₁₀ (i.e., the outlet air temperature the outlet air temperature calculated in step S ₆ the the to). Based on the blown air temperature To and the blown air amount Va determined as described above, the comfort factor F ₂ (= K ₁ · Va + K ₂ · To + K ₃ · Ta) is calculated by the second calculating means 41 in step S ₁₁ .
+ K ₄ · Tr + K ₅ · Ts), and (F ₂ −5) and | F _{2 in} steps S ₁₂ and S ₁₃ .
-5 | is calculated. Then, by adding a predetermined adding air volume .DELTA.Va in step S ₁₄ the airflow volume Va at that time, the following airflow volume (i.e., the Va = Va + .DELTA.Va), performs the same operation as described above returns to the step S ₅ again. The calculation result is stored in the RAM built in the control circuit 22 each time.
Is read in.

[0027]-obtained as above _| F 2 -5 | combination of airflow volume is minimized Va and the outlet air temperature To is selected at step _SS 1 ~ SS _6.
The selection of the combination of the blown air amount Va and the blown air temperature To will be described with reference to FIGS.
| F 2 _-5 | values of the minimum airflow volume Va and the outlet air temperature To is calculated as the intersection of the heat exchange capacity Qa and comfort index F ₂ required. FIG. 11 shows a case where there are two intersections, that is, two solutions, and FIG. 12 shows a case where there is one solution. Thus, in step SS _1, it determines whether the solution there are two, if solutions of the two, in step SS _2, blowing air volume and Va ₀₁ toward the large and airflow volume is small If the set and _{Va 02.} In step SS _3, determines whether the heat load due to solar radiation (solar radiation amount) _{Q s} is _b 1 kcal or more. If _{Q s} is equal to or greater than a predetermined value in the amount of solar radiation, the flow proceeds to step SS _4, the inner airflow volume of the two solutions to choose whichever of the large _{(Va 01, To} 01). If Q _s is equal to or larger than the predetermined value in the amount of solar radiation, because the cabin is in a state to feel hot, by blowing air volume to select the solution of large, cabin air is more stirring, it can be eliminated discomfort . In addition, in step SS _3, Q in the amount of solar radiation
_{when s} is determined to be smaller than the predetermined value, the process proceeds to step SS _5, the inner airflow volume of the two solutions is more small (Va
₀₂ , To ₀₂ ). If the solution is determined as one in step SS _1, flow proceeds to step SS _6, selects the _{(Va 0,} To 0). Selection of these combinations is performed by the selection unit 42.

The blower 11 is set so that the combination (Va ₀₁ , To ₀₁ ), (Va ₀₂ , To ₀₂ ) or (Va ₀ , To ₀ ) selected as described above is obtained.
And the air mix damper opening θ may be controlled, but before that, it is determined in steps S _{16 to} S ₁₈ whether or not the vent mode selection was correct. That is, in step _{S 16 (F 2 -5) <} - α ( e.g., alpha
= If it is determined that 0.9), since the occupant's upper body is cold state, when the process proceeds to later-described B / L mode, it is determined in step S ₁₆ and (F 2 _-5) ≧ α is in step _{S 17} is _(F 2 -5) of whether ≦ 0 determination is made. In step _{S 17 (F 2}
If it is determined that -5)> 0, the process proceeds to step S ₁₉ as a vent mode selection is correct, step SS
_{4, SS} 5, after the value and mode of the selected airflow volume Va and the outlet air temperature To at SS ₆ is output by the control unit 43, the process returns to step _{S 3.} In Step _{S 17} if it is determined that _(F 2 -5) ≦ 0 is, To ₀ <α ₀ in step _{S 18} (e.g., alpha
₀ = 30 ° C.). If it is determined To ₀ ≧ α ₀ in step _{S 18,} since the upper body of the occupant is hot state, when the process proceeds to later-described B / L mode, is determined To ₀ <α ₀ in step _{S 18} is , the process proceeds to step _{S 19} as a vent mode selection is correct, step _{SS 4,} SS 5, after the value and mode of the selected airflow volume Va and the outlet air temperature to at SS ₆ is output by the control unit 43, step to return to S _3. With the above control, the vehicle interior temperature is maintained close to the comfortable temperature.

Next, control in the B / L mode will be described with reference to a flowchart shown in FIG. B
In the case of the / L mode, air is to be blown out from both the vent outlet 5 and the foot outlet 6 in the ventilation duct 1, and B / B is determined by the ratio of the amount of air blown out from both the outlets 5 and 6. L mode (I), B / L mode (I
I) and B / L mode (III). In addition, B / L
In the mode (I), 75% of air is blown from the vent outlet 5 and 25% of air is blown out from the foot outlet 6. In the B / L mode (II), 60% of air is blown from the vent outlet 5 and the foot outlet 6 is blown. 40% of the air is blown out, and in the case of the B / L mode (III), 45% of the air is blown out of the vent outlet 5 and 55% of the air is blown out of the foot outlet 6.

[0030] First, by performing opening control of the mode switching damper 8,9 In step _{S 20,} B / L mode (I)
With the vehicle interior temperature T in step _{S 21}
In order to set r to the set temperature Tset, the heat exchange capacity Q is required.
a is calculated in the same manner as described above. Then, step S
₂₂ to S _32, separated airflow volume Va per predetermined step ΔVa from Teikazeryou Val to large air flow Vah in, blowout air temperature To at that time, the air mixing damper opening theta, comfort index _{F 2, F} 4, | F ₂ −5 |, | F ₄ −
5 | etc. are calculated.

[0031] That is, in step _{S 22} Va = Va
decided l, if it is determined that Va <Vah in step _{S 23,} blowout air temperature T in step _{S 24}
o [= (Qa / Cp · γ · Va) + Tr] is calculated, and the air mixing damper opening degree θ in step _{S 25} [=
(To−Te) / (Kw · Tw−Te)] is calculated.
However, in the case of the B / L mode (I), the vent outlet 5
Because that is the fact that the air is blown out from both the foot air outlet 6, the outlet air temperature Tov of vent outlet 5 in the air mixing damper opening degree θ from a temperature control characteristic diagram shown in FIG. 13 in step S ₂₆ And the outlet air temperature Tof of the foot outlet 6 are read out. on the other hand,
Airflow volume of vent outlet 5 in step _{S 27} Va
v (= 0.75 × Va) and the amount V of air blown out of the foot outlet 6
af (= 0.25 × Va) is calculated. The calculation up to this point is performed by the first calculation means 40 in the control circuit 22. The outlet air temperature Tov, determined as described above,
Tof and airflow volume Vav, based on the Vaf, comfort index F by the second arithmetic means 41 in step _{S 28
2} and F ₄ are calculated, and further, steps S ₂₉ and S ₃₀
In _{(F 2 -5), (F} 4 -5) and _| F 2 -5
_|, | F 4 -5 | is calculated. By the way, the relationship between (F ₂ -5) and (F ₄ -5) in the B / L mode is shown in FIG.
6 so that both (F ₂ -5) and (F ₄ -5) approach 0, from the point P to the center O
The distance L may be used as a guide. The distance L is L ² =
^{_{(F 2 -5) 2 + (}} F 4 -5) is calculated from the ^second relationship. Then, by adding a predetermined adding air volume .DELTA.Va in step _{S 32} the airflow volume Va at that time, the following airflow volume (i.e., the Va = Va + .DELTA.Va), again step S
Returning to ₂₃ , the same calculation as above is performed. The calculation result is read into the RAM incorporated in the control circuit 22 each time.

The combination (Va ₀ , To ₀ ) of the blown air amount Va and the blown air temperature To which the distance L obtained as described above is minimum is selected by the selecting means 42 at step S.
Selected at ₃₃ . Note that two solutions of this combination may be obtained depending on the magnitude of the predetermined additional air volume ΔVa. In this case, a combination having a low outlet air temperature To is selected. Also in step _{S 52} and step _{S 71} described later, it is similar.

(Va ₀ , T
o ₀ ) can be obtained by controlling the output of the blower 11 and the opening degree of the air mix damper θ.
/ L-mode (I) whether selection was correct determination performed in step _S 34 _{to S 37.} That is, step S
If it is determined at ₃₄ that α <(F ₂ −5) and α <(F ₄ −5), the upper body and lower body of the occupant are both hot (see FIG. 16), and the process returns to the vent mode described above and returns to step in _{S 34, α ≧ (F 2} -5), α ≧ (F 4 -
When the 5) and is determined in step _{S 35} -
It is determined whether α ≦ (F ₂ −5) and −α ≦ (F ₄ −5). -Α In Step _{S 35> (F 2}
-5) and -α> (F ₄ -5), the upper and lower bodies of the occupant are both cold (see FIG. 16).
The mode shifts to the B / L mode (II) to be described later, and step S
_At −35 ≦ (F ₂ −5), −α ≦ (F ₄ −5) at ₃₅
If it is determined that “Tov” is selected in step _S36 .
A determination is made whether <α ₀ . Step _S36
If it is determined that Tov ≧ alpha ₀ in, since the upper body of the occupant is hot state, described later B / L mode (II)
Proceeds to, Tov in step _{S 36} <When it is determined that the alpha _0, in step _{S 37} Tof> beta
(For example, β = 10 ° C.). If it is determined that Tof ≦ beta in step S _37, since the occupant's lower body is cold state, when the return to the aforementioned vent mode, is determined Tof> beta in step S ₃₇ is, B / L mode ( the process proceeds to step S ₃₈ as I) selected was correct, after the value and mode of the selected airflow volume Va and the outlet air temperature to is output by the control unit 43 in step S _33, step S
It returns to ₂₁ . With the above control, the vehicle interior temperature is maintained close to the comfortable temperature.

[0034] If it is migrated in step _{S 35} and _{S 36} to B / L mode (II), as shown in the flow chart of FIG. 8, performs control of the opening degree of the mode switching damper 8,9 In step _{S 39} And B / L mode (II)
With the steps _S 40 _{to S} by the same control as in the above-mentioned B / L mode (I) in _51, blowout air temperature To, the air mixing damper opening theta, comfort index _{F 2, F} 4, | F ₂ −5 |, | F ₄ −5 |, distance L
Is calculated and read into the RAM incorporated in the control circuit 22. Here, Tov in step _{S 45,} Tof
Temperature control characteristic diagram of Figure 14 is used for in determining, Vav in step _{S 46} = 0.6
Va and Vaf are set to 0.4 Va.

The combination (Va ₀ , To ₀ ) of the blown air amount Va and the blown air temperature To which the distance L obtained as described above is minimum is selected by the selecting means 42 in step S.
Selected at ₅₂ . The output of the blower 11 and the opening degree of the air mix damper θ may be controlled so as to obtain (Va ₀ , To ₀ ) selected as described above. Before that, the B / L mode (II) selection is performed. performed in step _S 55 _{to S 56} of the right it was determined whether.

That is, in step _S53 , α <(F ₂
-5), when α <(F ₄ -5), it is determined that both the upper body and lower body of the occupant are hot (see FIG. 16), so the process returns to the B / L mode (I) described above and step _S53. in α ≧ _(F 2 -5), if it is determined alpha ≧ and _(F 4 -5) is, -α ≦ _(F 2 -5) in step _{S 54,}
A determination is made as to whether −α ≦ (F ₄ −5). -Α In Step _{S 54> (F 2 -5)} , - α> (F
₄ when it is determined that -5), because a upper body of the occupant, lower body both cold state (see FIG. 16), the process proceeds to later-described B / L mode (III),-.alpha. ≦ in step _{S 54}
When it is determined that (F ₂ −5) and −α ≦ (F ₄ −5), it is determined in step S ₅₅ whether Tov <α ₀ is satisfied. Tov ≧ α in step _{S 55
If 0} is determined, since the upper body of the occupant is hot state, when the process proceeds to later-described B / L mode (III), is determined Tov <alpha ₀ in step S _55, the
In step _{S 56} Tof> β (e.g., beta = 10
C). If it is determined that Tof ≦ beta in step S _56, since the occupant's lower body is cold state, when the return to the aforementioned B / L mode (I), was determined to Tof> beta in step S _56, the B / L mode (II) selected proceeds to step _{S 57} as a correct way, after the value and mode of the selected airflow volume Va and the outlet air temperature to is output by the control unit 43 in step _{S 52,} step _{S 40} Return to With the above control, the vehicle interior temperature is maintained close to the comfortable temperature.

[0037] If it is migrated in step _{S 54} and _{S 55} to B / L mode (III), as shown in the flowchart of FIG. 9, subjected to the control of the opening degree of the mode switching damper 8,9 In step _{S 58} And B / L mode (II
With a I), the same control as the case of the above B / L mode in step _S 59 _{~S 70} (I),
The required blow-off air temperature To, the air mix damper opening θ, the comfort indexes F ₂ , F ₄ , | F ₂ -5 |, | F ₄ -5 | and the distance L are calculated, and the RAM built in the control circuit 22 is calculated. To read. Here, in Step _S64 , Tov, T
is in determining of temperature control characteristic diagram of Figure 15 is used, Vav in step _{S 65} =
0.45 Va, Vaf = 0.55 Va.

The combination (Va ₀ , To ₀ ) of the blown air amount Va and the blown air temperature To which the distance L obtained as described above is minimum is selected by the selecting means 42 in step S.
Selected at ₇₁ . The output of the blower 11 and the opening degree of the air mix damper θ may be controlled so as to obtain (Va ₀ , To ₀ ) selected as described above. Before that, the B / L mode (III) selection is performed. performed in step _S 72 _{to S 75} of the right it was determined whether.
That is, in step _S72 , α <(F ₂ −5), α <
If it is determined _(F 4 -5) and, since the occupant of the upper body, lower body both hot state (see FIG. 16), returns to the above-mentioned B / L mode (II), alpha ≧ (F in step _{S 72
2} -5), if it is determined alpha ≧ and _(F 4 -5) is,-.alpha. ≦ in step _{S 73 (F 2 -5),} - α ≦ (F
₄ -5) or a whether a determination is made. Step S
-Α In _{73> (F 2 -5),} - α> (F 4 -5)
And when it is determined, so that the upper body of the occupant, lower body both cold state (see FIG. 16), moves to a heater mode described later, -α ≦ (F 2 _-5) in step S _73, - alpha
If it is determined that ≦ (F ₄ −5), the process proceeds to step S _74.
Tov <of whether alpha ₀ determination is made in.
Here, α is when starting from the vent mode,
A different value can be set when starting from the heater mode. If it is determined that Tov ≧ alpha ₀ in step S _74, since the upper body of the occupant is hot state,
When shifted to a heater mode described later, is determined Tov <alpha ₀ in step _{S 74,} the step _{S 75}
It is determined whether or not Tof> β. If it is determined that Tof ≦ beta in step _{S 75,} since the occupant's lower body is cold state, returns to the above-mentioned B / L mode (II), in step _{S 75} Tof> beta
If it is determined that the B / L mode (III) selection is correct, the process proceeds to step _S76 and proceeds to step _S71.
After the value and mode of the selected airflow volume Va and the outlet air temperature To is output by the control means 43 in, the process returns to step S _59. With the above control, the vehicle interior temperature is maintained close to the comfortable temperature.

[0039] When it is shifted to the heater mode in step _{S 73} and _{S 74,} as shown in the flowchart of FIG. 10, in step _{S 77,} and the heater mode mode switching damper 9, 10 and opening control . Next, in step SS _7, the solar radiation amount Qs is determined whether _b 2 kcal less, if the solar radiation amount Qs is _b 2 kcal or more, since the occupant feels hot, the aforementioned B /
Return to L mode (III). Insolation Qs is b ₂ kcal
If it is smaller, the necessary blown air temperature To, the air mix damper opening θ, and the comfort index F ₄ , | F ₄ -5 | are determined in steps S _{78 to} S ₉₀ by the same control as in the above-described vent mode. It is calculated and read into the RAM incorporated in the control circuit 22. Here, if θ ≧ 1 in step _S83 (that is, if the air mix damper 13 is switched so that the amount of air flow to the heating heat exchanger 14 is set to 100%), To = To in step _S84 .
[Kw (Tw−Ta) / Cp · γ · Va] + Ta (that is, the blown air temperature To is replaced by the outlet temperature of the heating heat exchanger 14), and it is determined that θ <1 in step _S83 ( that is, if the air mixing damper 13 is also switched so as to air to the heating heat exchanger 14), and to = to in step S ₈₅ (i.e., in step S ₇₂ the outlet air temperature to The calculated outlet air temperature). Further, in the heater mode, a 75% blowout air volume is supplied from the foot outlet 6.
Since the blowout air amount of 25% is blown out from the defroster blowout port 7, in step S ₈₆ , V
af = 0.75 Va.

[0040]-obtained as above _| F 4 -5 | combination of airflow volume is minimized Va and the outlet air temperature To is selected at step _SS 8 _{~ SS 11.} The selection of the combination of the blown air amount Va and the blown air temperature To will be described with reference to FIGS. 11 and 12, as in the case of the above-described vent mode. | _F 4 -5 |
The value of the blown air amount Va and the blown air temperature To at which
It is calculated as the intersection of the heat exchange capacity Qa and comfort index F ₄ required. FIG. 11 shows a case where there are two intersections, that is, two solutions, and FIG. 12 shows a case where there is one solution. In step SS _8, judges whether the solution there are two, if the solution is two in step SS _9, and Va ₀₁ towards airflow volume is large, also towards airflow volume is small Va ₀₂ is set. Next, in step _{SS 10,}
The smaller the inner flow rate of the two solutions (Va ₀₂ , To ₀₂ )
Select This is because the solar radiation amount Q _s is small and comfortable index F ₄ is the same than the predetermined value, because it is preferable to select a smaller blower noise. Step SS
If it is determined in step ₈ that there is one solution, step S
Proceeds to S _11, selects the _{(Va 0,} To 0). Selection of these combinations is performed by the selection unit 42.

(Va ₀₂ ,
To obtain (To ₀₂ ) or (Va ₀ , To ₀ ),
May be controlled output and the air mixing damper opening degree θ of the blower 11, but performs the determination whether the heater mode selection is correct before in step S ₉₂ to S _94. That is, if it is determined in step _{S 92} and _(F 2 -5)> _α, since the occupant of the lower body is hot state,
Returning to the B / L mode (III) described above, step _S92
In the case where it is determined that _(F 4 -5) ≦ _α, in step _{S 93} is _(F 4 -5) whether a ≧ 0 determination is made. In step _{S 93 (F} 4 -5) <
0 and if it is determined, the process proceeds to step _{S 95} as a heater mode selection is correct, step _SS 10, S
After the value and mode of airflow volume Va and the outlet air temperature To is selected at S ₁₁ is outputted by the control unit 43, the process returns to step S _78. If (F ₄ −5) ≧ 0 is determined in step S ₉₃ , it is determined in step S ₉₄ whether To ₀ > β. If it is determined in step _S94 that To ₀ ≦ β, the lower body of the occupant is in a cold state.
/ L returns to the mode (III), when it is determined that the To ₀ <beta have put to step _{S 94,} the process proceeds to step _{S 95} as a heater mode selection is correct, step S
After the value and mode S _10, airflow volume is selected in the _{SS 11} Va and the outlet air temperature To is output by the control unit 43, the process returns to step _{S 78.} With the above control, the vehicle interior temperature is maintained close to the comfortable temperature.

[0042] Incidentally, in step S ₁ in FIG. 6, when it is determined that Q> 0 becomes a be initiated from the heating operation, the control from step S ₇₇ in FIG. 10 is started. In the above embodiment, when calculating the comfort index F based on the positive or negative of the heat load generated in the vehicle interior,
Although so as to change the constant K ₁ ~K _5, switching of blow mode (i.e., whether the heat mode or a vent mode) be changed the constants K ₁ ~K ₅ based on Good.

The present invention is not limited to the configuration of the above-described embodiment, and it is needless to say that the design can be appropriately changed without departing from the gist of the invention.

[0044]

As described above, according to the present invention, the amount of air blown out and the temperature of the air blown out are expressed in the vehicle interior so that the degree of comfort experienced by the occupant as an index approaches the optimum value. By controlling according to the heat load, the vehicle interior temperature can be comfortably approached and maintained.

[Brief description of the drawings]

FIG. 1 is a function correspondence diagram in a control device of a vehicle air conditioner of the present invention.

FIG. 2 is a system diagram of a control device of the vehicle air conditioner according to the embodiment of the present invention.

FIG. 3 is a circuit configuration diagram of the control device of the vehicle air conditioner according to the embodiment of the present invention.

FIG. 4 is a change characteristic diagram of a comfort index used in the control method and the control device of the vehicle air conditioner of the present invention during cooling or heating.

FIG. 5 is a diagram illustrating an example of calculating a comfort index used in the control method and the control device of the vehicle air conditioner according to the present invention;
It is a characteristic diagram.

FIG. 6 is a flowchart illustrating a mode of a vent mode control in the control method and the control device of the vehicle air conditioner according to the embodiment of the present invention.

FIG. 7 is a flowchart illustrating a mode of B / L mode (I) control in the control method and the control device for the vehicle air conditioner according to the embodiment of the present invention.

FIG. 8 is a flowchart showing a mode of B / L mode (II) control in the control method and the control device for the vehicle air conditioner according to the embodiment of the present invention.

FIG. 9 is a B / L mode (III) in the control method and control device for the vehicle air conditioner according to the embodiment of the present invention.
It is a flowchart which shows the aspect of control.

FIG. 10 is a flowchart showing a mode of a heat mode control in the control method and the control device for the vehicle air conditioner according to the embodiment of the present invention.

FIG. 11 is a characteristic diagram illustrating a relationship between the blown air amount Va and the blown air temperature To when controlling the vent mode and the heat mode in the control method and the control device for the vehicle air conditioner according to the embodiment of the present invention.

FIG. 12 is a characteristic diagram showing a relationship between the blown air amount Va and the blown air temperature To when controlling the vent mode and the heat mode in the control method and the control device for the vehicle air conditioner according to the embodiment of the present invention.

FIG. 13 is a temperature control characteristic diagram at the time of B / L mode (I) control in the control method and the control device for the vehicle air conditioner according to the embodiment of the present invention.

FIG. 14 is a B / L mode (II) in the control method and control device for the vehicle air conditioner according to the embodiment of the present invention.
It is a temperature control characteristic diagram at the time of control.

FIG. 15 is a B / L mode (II) in the control method and the control device for the vehicle air conditioner according to the embodiment of the present invention.
It is a temperature control characteristic diagram at the time of I) control.

FIG. 16 is a characteristic diagram showing a relationship between (F ₂ -5) and (F ₄ -5) at the time of B / L mode control in the control method and the control device for the vehicle air conditioner according to the embodiment of the present invention. is there.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 ventilation duct 11 blower 12 cooling heat exchanger 13 air mix damper 14 heating heat exchanger 22 control circuit 40 first calculation means 41 second calculation means 42 selection means 43 control means Va blown air volume Ta outside air temperature Tr vehicle interior temperature temperature conversion value of to outlet air temperature Ts insolation F comfort index K ₁ ~K ₅ constant Q heat load Qs insolation

Continued on the front page (72) Inventor Yasuhiro Tono 3-1, Fuchi-machi, Shinchu, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Inventor Toshikazu Ishikawa 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Naldec Co., Ltd. (56) References JP-A-3-13751 (JP, A) JP-A-4-43120 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60H 1/00 101

Claims (4)

(57) [Claims] 1. A ventilation duct for sending air into a vehicle interior, a blower, a cooling heat exchanger, a heating heat exchanger, and a heat exchanger for heating the air cooled by the cooling heat exchanger. A method of controlling a vehicle air conditioner having an air mix damper that adjusts the temperature of air blown into a vehicle cabin by adjusting a ventilation ratio to a vehicle cabin, wherein a heat balance formula required to maintain the cabin temperature at a predetermined temperature is provided. The correlation between the originally obtained blown air temperature and the blown air amount of the blower, and at least the heat generated in the vehicle interior
Load-related parameters such as outside air temperature and vehicle interior
An index calculated by various parameters including a temperature, an outlet air temperature, and an outlet air volume, and a comfort index representing a passenger's comfort level are obtained, and among the combinations of the outlet air temperature and the outlet air volume, the comfort index is Is selected according to the heat load generated in the passenger compartment.
And there are two combinations that are closest to the optimal value
If the heat load generated in the vehicle interior is equal to or greater than a predetermined value,
Selects a combination with a large blowing air volume and
Control of the vehicle air conditioner, wherein a combination of a small amount of blown air is selected , and the opening of the air mix damper and the output of the blower are controlled by a combination of the selected blown air temperature and the blown air amount. Method. 2. The method according to claim 1, wherein the heat load generated in the vehicle interior is an amount of solar radiation. 3. A fan, a heat exchanger for cooling, a heat exchanger for heating, and a heat exchanger for heating air cooled by the heat exchanger in a ventilation duct for sending air into the vehicle interior. A control device for an air conditioner for a vehicle having an air mix damper for adjusting the temperature of air blown into the vehicle cabin by adjusting the ratio of air to the vehicle, wherein a heat balance formula required for maintaining the cabin temperature at a predetermined temperature is provided. a first computing means for obtaining a correlation between the outlet air temperature obtained based and airflow volume of the air blower, reduced
Both are parameters related to the heat load generated in the cabin
A second calculating means for obtaining a comfort index, which is an index calculated based on various parameters including the outside air temperature and the vehicle interior temperature, and the blow-out air temperature and the blow-off air volume, and represents the comfort level of the occupant; Among the combinations of the blow-off air temperature and the blow-off air volume in the comfort index, the combination in which the comfort index approaches the optimum value is selected according to the heat load generated in the vehicle interior, and the optimum value is selected.
If there are two combinations that are closest to
When the heat load generated on the air is more than a predetermined value, the blown air volume is large.
Select a combination, and if it is less than the predetermined value,
Selecting means for selecting a combination , and control means for controlling the opening of the air mix damper and the output of the blower according to the combination of the blow-off air temperature and the blow-off air volume selected by the select means. Control unit for vehicle air conditioner. 4. The control device for a vehicle air conditioner according to claim 3, wherein the heat load generated in the vehicle interior is an amount of solar radiation.