JPH04191118A - Air conditioner - Google Patents

Abstract

PURPOSE:To enhance control responsiveness by regulating the blow-off air temperature of a lower blow-off port by the opening of an air mix damper, regulating the blow-off air temperature of an upper blow-off port by the respective opening of a cool air bypass damper and the air mix damper, and thereby assuming feed-back control based on deviation between the temperature of each blow-off port and the set temperature. CONSTITUTION:The blow-off air temperature of blow-off ports 18 and 19 from respective temperature sensors 20 and 21, and the detected information from the inside air sensor 26, an outside air sensor 27 and a sunshine sensor 28 are inputted into a controller 22 respectively, so that an air mix damper 15 and a cool air damper 17 are thereby driven. This thereby allows conditioned air in which cool air passing through a cool wind bypass 16 is mixed with air, to be supplied to the upper blow-off port 19. Deviation between the blow-off temperature of the respective blow-off ports 18 and 19 is obtained by a control circuit 22, so that feed-back control is thereby assumed on the cool air bypass damper 17 and the air mix damper 15.

Description

[Detailed Description of the Invention] [Industrial Application Fields] This invention can be effectively applied to, for example, automobiles equipped with two or more air-conditioned air outlets, and can also be used for indoor air conditioning. Regarding air conditioners.

[Prior Art] For example, in an air conditioner that controls the air conditioning in the passenger compartment of an automobile, there is a first outlet that blows out conditioned air mainly in the direction of the upper body (face) of the passenger, and a It is equipped with a second outlet that blows out conditioned air around the center.

When controlling the blowing of conditioned air from two outlets in this way, for example when controlling heating, it is effectively used when it is required to keep the feet warmer than the upper body. The temperatures of the air blown from the first and second air outlets, which are set differently, are independently controlled.

In such an air conditioner having two or more outlets, means for individually controlling the temperature of the air blown from each outlet is disclosed in, for example, Japanese Patent Laid-Open No. 62-2758.
It has been proposed to use a cold air bypass method as shown in Japanese Patent No. 16 or Japanese Unexamined Patent Publication No. 1-293218. The temperature of the air blown from the first and second air outlets set above and below is controlled independently.

In such an air conditioner, temperature sensors are set at the upper and lower parts of the vehicle interior, and the detected temperature from each temperature sensor is matched with the set temperature set for each outlet. Air mix (which controls the mixing ratio of cooled air and heated air according to the difference)
A/M) damper, and a cold air damper that controls the cold air passing through the cold air bypass.

However, there is a long delay time between when the A/M damper and the cold air damper change, when the temperature of the air blown from each outlet changes, and until this change in temperature of the blown air is detected by each temperature sensor. . Further, if each damper is operated only a little, the temperature sensor may not respond at all. Therefore, there is a problem in the controllability of the blowing temperature.

However, when the set temperature is changed, there are many conditions that require responsiveness of the outlet temperature, such as correction when the solar radiation conditions change.

As a countermeasure for improving the responsiveness of such blow-out air temperature control, it is conceivable to set a temperature sensor directly at each blow-off port. In this way, by measuring the two outlet air temperatures independently and simply adopting conventional control means, A/M
When the two actuators that drive the damper and the cold air damper are subjected to feedback control, the operation of one actuator will affect the temperature of the outlet air on the other, and this will cause the temperature at the outlet affected by this to fluctuate. arise. Therefore, the desired temperature controllability cannot be obtained at each outlet.

[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned points. In particular, in a device in which two or more air-conditioned air outlets are set, the temperature of the air blown from each outlet is It is an object of the present invention to provide an air conditioner in which the temperature of each outlet can be independently controlled without being influenced by each other and with sufficient responsiveness. It is.

[Means for Solving the Problems] An air conditioner according to the present invention includes an air-conditioning air passage to which cooled air is supplied and a heating mechanism for heating the circulating air, and a heating mechanism set in parallel to this passage. and a cold air bypass passage through which a part of the cooling air is flowed,
An air mix damper that controls the mixing ratio of heated air and cold air is set in the conditioned air passage, and a cold air bypass damper is set in the cold air bypass passage, so that the output air from the cold air bypass passage and the air mixed from the conditioned air passage are set. The output air from the conditioned air passage is mixed with the output air and blown out from the first outlet, and the output air from the conditioned air passage is blown out from the second outlet. A temperature sensor is set at each outlet, and the deviation between the measurement signals from these temperature sensors and the set temperature set corresponding to each outlet is determined, and the dampers are feedback-controlled. And the first
The temperature deviation corresponding to Suita (70) is corrected by the feedforward gain corresponding to the temperature deviation corresponding to the second outlet, and the control deviation value of the cold air bypass damper is determined.

[Function] According to the air conditioner configured in this way, the temperature of the air blown from the second outlet is determined by the air mix damper, and feedback control is performed based on the deviation between the measured temperature of the outlet 170 and the set temperature. be done. Also, the first
Even if the cold air bypass damper is in a fixed state, the temperature of the air blown from the outlet changes by changing the air mix damper. However, by correcting it with a feedforward gain corresponding to the temperature deviation corresponding to the second outlet, which is a factor that controls this air mix damper, the temperature of the first outlet can be set to this outlet. There is no need to wait for a measurement signal from the temperature sensor, and the target temperature is controlled appropriately and responsively.

[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows its configuration, and this air conditioner is constructed using a cold air bypass system. First, air from the outside is taken in by the blower 11, and this air is passed through the evaporator I2 that constitutes the cooling unit. Here, when this device is configured to be mounted on a vehicle, air intake ports are opened to the interior of the vehicle and to the outside of the vehicle, and air is taken in from the selected one. When taking air from inside the vehicle,
The conditioned air is circulated inside the vehicle, which is effective for rapid heating and cooling.

The cold air cooled by the evaporator 12 is transferred to the air conditioning air passage 1
3, and a heater core 14 is set in this passage 13 so as to partially block this passage 13.

That is, the cold air is heated by passing through the heater core 14 and sent to the downstream side, and the cold air that does not pass through the heater core 14 is also sent to the downstream side.

This air conditioning passage 13 is provided with an air mix damper 15 that variably controls the amount of cold air supplied to the heater core 14 and the ratio of the amount of cold air that does not pass through the heater core 14, so that the temperature of the air sent downstream is The adjustment is controlled by the opening degree of the air mix damper 15.

Further, a cold air bypass passage 16 is provided in parallel with the conditioned air passage 13. This cold air bypass passage 1B
The cold air cooled by the evaporator 12 is branched and supplied to the passage 16, and a cold air bypass damper 17 is set at the entrance of the passage 16.

That is, the amount of cold air supplied to the cold air bypass passage 16 is variably controlled by the opening degree of the damper I7.

The cold air that has passed through the cold air bypass passage 16 set in this way is mixed with the conditioned air that has passed through the air conditioned air passage 13, and the upper (FACE) outlet I8, which becomes the first outlet, is mixed with the conditioned air that has passed through the air conditioned air passage 13.
is mixed and blown toward the upper body of the occupant. In addition, the lower part (FOO
T) Conditioned air whose temperature has been adjusted by the air mix damper I5 from the conditioned air passage 13 is guided to the outlet 19 and blown out toward the feet of the occupant. Temperature sensors 20 and 21 are installed in these outlets 18 and 19, respectively, to measure the temperature of the blown air.

Such control of the air conditioner is executed in a control circuit 22 by an electronic control unit (ECU) configured by a microcomputer, for example, and the temperature sensor 2
Information on the temperature of the air blown out from the outlets 18 and 19 measured at points 0 and 21 is input to this control circuit 22 . The commands from the control circuit 22 control the motors 23 and 24 that drive the air mix damper 15 and the cold air bypass tamper 17, respectively. Furthermore, in order to control the amount of air taken in, the blower motor 25 that drives the blower 11 is controlled.

Here, the control circuit 22 receives a detection signal TR from the inside air sensor 26 that measures the temperature inside the vehicle, a detection signal TAM from the outside air sensor 27 that measures the temperature outside the vehicle, and a signal from the solar radiation sensor 28 that detects the intensity state of solar radiation. Each of the detection signals TS is inputted, and set temperature information from the temperature setting device 29 is also inputted. Here, the temperature setting device 29 is provided with an upper operation section 2911 for setting the temperature of the upper outlet 18 and a lower operation section 292 for setting the temperature of the lower outlet 19. Respectively set temperature information Tsetup and Tse
tlov is supplied to the control circuit 22.

In the control circuit 22, based on the input signal to the control circuit 22, the target air outlet temperature T A OPACE of the upper air outlet 18 and the target air outlet temperature T A OpooT of the lower air outlet 19 are determined by the following equations (1) and (2).
seek.

T A OPACE-K set X T 5etup
-K r X T R-KallXTAM-Ks
x'rs 10c・・・・・・・・・ (1) T A OPOOT= K set X T 5etl
ov -KrXTR-KamXTAM-Ks
x"rs 10c (2) The control circuit 22 also receives a blowout temperature signal T A ORPACE from the temperature sensor 20 of the upper blowout port 18 and a blowout temperature signal T A ORPACE from the temperature sensor 21 of the lower blowout port 19. Temperature signal T
A ORpoor is input, so based on these input signals, the upper and lower air outlets 18 and 1
The blowout temperature deviations EnpAcE and Enpoot corresponding to 9 are determined by the following equations (3) and (4), respectively.

En'pAcg-TAORpAci TAOpAcE
-(3) En FOOT=TAORFOOT TAO
(4) Once the blowout temperature deviations corresponding to the blowoff ports 18 and 19 are obtained in this manner, the control deviations EnB and En of the cold air bypass damper 17 and the air mix damper 15 are calculated using the following equations ( 5) Obtain by (6).

En B = En PACE-En pootX F
---(5) En = EnpooT...
・・・・・・・・・・・・・・・・・・ (6) Here,
F shown in equation (5) is the feed forward gain,
This feedforward gain F is determined, for example, on a matrix as shown in FIG. In other words, the temperature difference between the upper and lower air outlets (-T A ORFOOT - T A O
When RPACII) is as small as, for example, 10° C., the effect of the operation of the air mix damper 15 on the temperature of the air blown from the upper outlet 18 becomes large, so the value of the feedforward gain F is increased. and,
The operation of the air damper 15 cancels out the effect on the temperature of the air blown from the upper outlet 18.

In addition, if the temperature difference between the upper and lower air outlets is large, for example 20°C, the opening degree of the cold air bypass damper (() will increase and a large amount of cold air will flow through the air mix damper 15.
The effect of the operation on the temperature of the air blown from the upper air outlet 18 is small. Therefore, in this state, the value of the feedforward gain F is reduced to stabilize the blowout temperature control.

FIG. 3 shows the configuration of the control circuit 22 for executing such control, in which the set temperature information T A OPACE and T A corresponding to the setting state in the temperature setting device 29 are
OFOOT is input to the computing units 41 and 42, respectively, and the measured temperature signals T A OR, AC, and T A ORFOOT of the temperature sensors 20 and 21 are (
1) and (2) are calculated to calculate the temperature deviation EnPA.
CI! and Enp. Get o7. And the temperature deviation E
The feedforward gain F is determined based on nPOOT in accordance with FIG. 3, and the arithmetic unit 43 calculates the equation (5) to determine the control deviation EnB of the cold air bypass tamper 27.

Then, the control deviation of the cold air bypass tamper 17 and the control deviation En of the air mix damper 15 corresponding to the temperature deviation EnFOOT are supplied to the cold air bypass tamper driving device 44 and the air mix damper driving device 45, respectively. In these drive devices 44 and 45, output values are determined based on PID control formulas, and
A motor 24 that drives the cold air bypass damper 17 and a motor 23 that controls the air mix damper 15 are controlled to drive and control the dampers 17 and 15, respectively.

In response to the operation of the air mix damper 15, the heater core 1
The heat exchange ff1QA in the wake of No. 4 changes with time, and this appears as a change in the temperature of the air blown from the lower outlet 19, but the temperature detection signal of the temperature sensor 21 changes with a delay.

In addition, the bypass amount of cold air changes in response to the operation of the cold air bypass damper 17, and at the same time, due to the influence of the cold air bypass amount, the heater core 14
The amount of air flowing through the area also changes. Therefore, the heat ffiq flowing from the wake of this heater core 14 toward the upper outlet 18
AXM changes.

Here, M is influenced by the opening degree of the cold air bypass tamper 17, and the smaller the opening degree of the damper 17, the larger M becomes, and the larger the opening degree of the damper 17, the smaller the value of M becomes.

Therefore, the heat HQpAcp of the upper outlet 18 changes with a time delay due to the bypass amount of cold air and the heat ff1QAXM, and the temperature sensors 20 and 21 set at the upper outlet 18 and the lower outlet 19 respectively change.
The respective temperature detection signals TAORFAcl! and T
AORpoor changes with a delay, and this temperature detection signal is fed back.

That is, the feedforward gain F is set as a compensation function for the influence coefficient M determined by the air volume ratio depending on the opening degree of the cold air bypass tamper 17.

FIG. 4 shows the flow of operation in this control circuit 22,
In step 101, the temperature set by the temperature setting device 29 is read, and in step 102, the temperature set by the various sensors 2 is read.
Read signals from 6-28. Then, in the next step 103, temperature signals are read from the temperature sensors 20 and 21 set at each outlet 18 and 19, and in the next step 104, it is determined whether the control period T seconds has elapsed, and it is determined that the control period has not yet reached. In this state, the process returns to step 101.

If it is confirmed in step 104 that T seconds of the control period have passed, the process proceeds to step 105 to calculate the blowout temperature deviation En, and in step 106 the feedforward gain F
seek.

Once the temperature deviation En and the feedforward gain F have been obtained in this way, in step 107 the damper 17
and 15 control deviations EnB and En are determined, and in step 108, the actuator output for driving the damper is obtained.

In the embodiments so far, the feedforward gain F is determined according to the temperature difference between the air outlet between the upper and lower outlets, but the opening degree of the cold air bypass damper 17 or the air volume ratio with the air conditioning air passage 13 is detected. If possible, the same effect can be obtained by determining the feedforward gain F depending on the opening degree of the cold air bypass damper 17 (corresponding to FIG. 2), for example.

Also, the target blowout temperature T A OFAC+! , T A
OFOOT to the upper and lower temperature setting operation section 2 of the temperature setting device 29.
Signal Tsetu corresponding to the setting states of 91 and 292
p and Tsetloν, the detection signal TR from the inside air sensor 26, the detection signal TAM from the outside air sensor 27, and the detection signal TS from the solar radiation sensor 28. You can also ask for it.

In the embodiment, since the influence of the drive control of the air mix damper 15 on the temperature of the air blown from the upper outlet 18 is large, the influence of the operation of the cold air bypass damper 27 on the temperature of the blown air from the lower outlet 19 is large. Although only the feedforward gain F is used as shown in equation (5), the feedforward gain FB may also be used in equation (6) to perform control as shown in equation (7) below. .

En = En pooTEn PACEX F B
---(7) Here, FB is, for example, 0.1''.

However, the effect of changing FB depending on the blowout temperature difference is generally considered to be small, although it varies depending on the structure of the air conditioner.

[Effects of the Invention] As described above, according to the air conditioner according to the present invention, when two air outlets are set, for example, upper and lower, and the temperature of the air blown from each of the two air outlets is independently controlled, The temperature can be controlled to the target temperature state without affecting each other, and the control responsiveness can be set favorably. Therefore, such an air conditioner can be effectively used as a device installed in a car, for example, and can also be used in other indoor air conditioners that require multiple outlets with different temperature settings. It can be used effectively when

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating an air conditioner according to an embodiment of the present invention, FIG. 2 is a diagram showing the setting state of the feedforward gain, FIG. 3 is a diagram showing the configuration of the control circuit, and FIG.
The figure is a flowchart explaining the flow of control. 11... Blower, 12... Evaporator, 13...
- Air conditioning air passage, 14... Heater core, 15... Air mix damper, 16... Cold air bypass passage, 17
...cold air bypass tamper, 18...upper (first)
Air outlet, 19...lower (second) air outlet, 20.
21... Temperature sensor, 22... Control circuit, 29...
・Temperature setting device. Applicant's agent Patent attorney Takeshi Suzue 0th grade
Large 1 degree difference between upper and lower airflow Fig. 2 Fig. 4

Claims (1)

[Claims] An air conditioning air passageway to which cooled air is supplied and a heating mechanism for the circulating air is set, and a ratio of air passing through the heating mechanism to air not passing through the heating mechanism is controlled. , an air mix damper that adjusts the temperature of the output air from the conditioned air passage; a cold air bypass passage provided in parallel with the conditioned air passage and into which a portion of the cooled air is introduced; and the cold air bypass passage. a cold air bypass damper that controls the amount of cold air introduced into the air conditioner; a first outlet through which the air conditioning output air from the air conditioning air passage and the cold air output air from the cold air bypass passage are mixed and blown out; a second outlet through which the air conditioning output air from the air passage is blown out; and first and second temperature sensors that are set at the first and second outlets and measure the air temperatures of the corresponding outlets, respectively. and temperature setting means for setting the first and second outlet temperatures, respectively, first and second outlet temperature set values set by the temperature setting means, and the first and second temperatures. means for determining the respective outlet temperature deviations from the first and second outlet air temperature measurements measured by the sensor; and means for determining a control deviation value of the cold air bypass damper by correcting it with a feedforward gain corresponding to the deviation, and controlling the opening degree of the cold air bypass damper using the control deviation value obtained by this means. An air conditioner characterized by: