JPH02208117A - Blown-off air temperature controller of air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To maintain actually blown-off air temperature at the level which we do not feel uncomfortable by utilizing the correction corresponding to solar radiation calculated according to the amount of solar radiation in calculating a target blown-off air temperature, restricting its lower limit above a given level. CONSTITUTION:According to the amount of solar radiation detected by the solar radiation sensor 47, an arithmetic circuit 57 for solar radiation correction target blown- off air temperature calculates a correction corresponding to solar radiation. An arithmetic circuit 53 calculates a target blown-off temperature based on the setting room temperature by a setter 45, a target room temperature by an arithmetic circuit 52 and a reference target blown-off air temperature from a selecting circuit 51 to control the opening of an air mix door 55 through a driving circuit 56. In the correction corresponding to solar radiation, its lower limit is restricted above a given level, so that the target blown-off air temperature does not decrease remarkably under the condition where the level of the target blown-off air temperature depends on the level corresponding to solar radiation largely, for example, at a stationary cooling after completion of cool-down. It is thus possible to maintain actually blown-off air temperature at the level which we do not feel uncomfortable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air outlet temperature control device for a vehicle automatic air conditioner configured to control a target Suita temperature in accordance with the amount of solar radiation.

Conventional technology As a conventional auto air conditioner for vehicles, the Utility Model 63-1
The method disclosed in Japanese Patent No. 54303 has been proposed.

This automatic air conditioner has a calculation control device, and the calculation control device includes a target room temperature calculation circuit that calculates the target room temperature Tsor, and a target air temperature calculation circuit that calculates the target room temperature Tsor, and a target air temperature that is necessary to asymptotically maintain the target room temperature 'r's or. A target blowout temperature calculation circuit and the like are provided for correcting Tdo using solar radiation ff1Z.

Then, the actual blowing temperature is the target blowing temperature Td.

By controlling the air mix door of the air conditioner main body, the interior of the vehicle is maintained asymptotically at the target room temperature Tsor.

At this time, the following formula is used to calculate the target blowout temperature Tdo.

Tdo= Tdb −Kz−Z+ Kr(T sor
-Tr) + Ks (Ts -25) where Tab is the reference target blowing temperature, T is the room temperature, Ts is the set temperature, and coefficients Kz and Kr.

For example, the following values are used for Ks.

Kz;5/860℃・m”h/kcallKr;
2 Ks; 2 Problems to be Solved by the Invention However, in such conventional devices, the target blowout temperature Tdo is calculated by directly using the values of K and Z, which are correction values that take into account the amount of solar radiation. Therefore, in order to simplify the calculation, the target room temperature Tsor and the set temperature T
Assuming that all s1 vehicle interior temperatures T' are 25°C, the value of Kr(Tsor-T')+5(Ts-25) is 0, and the value of the target outlet temperature TdO is Tab-Kz
-It depends only on Z.

Therefore, the reference target blowout temperature 'r' at this point
d b is, for example, 13°C, and day 4. fffi is 6
If it is 60kcal, then Tdo=13-5=8, and a case may occur in which low-temperature wind of 8°C is blown into the passenger compartment.

At this time, under the above hypothetical conditions, when the temperature inside the vehicle reaches 25 degrees, it is after the end of cooldown and during steady cooling that continues for a long time. When blown out, the low-temperature wind could cause discomfort to the occupants.

The present invention has been made in view of such conventional problems, and when correcting the target outlet temperature by the amount of solar radiation, by regulating the lower limit of the correction value, it is possible to improve the temperature during steady cooling.
It is an object of the present invention to provide a blowout temperature control device for a vehicle automatic air conditioner that suppresses the blowout of low-temperature air.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention includes a detection means for detecting temperature-related physical environmental factors and outputting them as electrical signals, and temperature-related physical environmental factors in the vehicle interior. a means for transmitting an electrical signal according to a setting operation by a passenger to set a physical environmental factor, a proa unit, a cooling unit,
a drive device that drives a temperature-related operating element provided in an air conditioner body formed by sequentially connecting heater units;
In the automatic air conditioner, the automatic air conditioner includes a calculation control device that executes calculations based on the output signals of the detection device and the setting device, and sends a command signal to the drive device based on the calculation results, wherein the detection device is configured to detect the amount of solar radiation. A solar radiation sensor is provided to detect the solar radiation, and the arithmetic and control device calculates a solar radiation correction value based on the amount of solar radiation, and sets a solar radiation correction target that limits the lower limit of the calculated solar radiation correction value to a predetermined value or more. A blowout temperature calculation circuit is provided, as well as a target blowout temperature calculation circuit that calculates a target blowout temperature using the solar radiation corresponding correction value.

Effect In the above configuration, when the amount of solar radiation is detected by the solar radiation sensor, the solar radiation correction target outlet temperature calculation circuit calculates a solar radiation corresponding correction value and outputs it to the target outlet temperature calculation circuit. Then, the target outlet temperature calculation circuit calculates the target outlet temperature using the solar radiation correction value and sends a command signal to the drive device, which drives the operating element related to the outlet temperature and operates the air conditioner. Cold air having a target blowing temperature is fed into the vehicle interior from the main body.

At this time, since the lower limit of the solar radiation correction value is limited to a predetermined value or more, the degree to which the target outlet temperature value depends on the solar radiation correction value, such as during steady cooling after the end of cool-down. Under conditions where the temperature is high, the target blowout temperature does not fall extremely low, and therefore, during steady cooling, cold air that causes discomfort is not supplied into the passenger compartment from the air conditioner itself for a long period of time. There's nothing wrong with that.

Example An embodiment of the present invention will be described below with reference to the drawings.

That is, as shown in FIG. 2, the air conditioner main body l has a casing 2. 3. 5. Proa unit separated by 4. Cooling unit 6 Heater unit 7
It is constructed by sequentially connecting the following. Said proa unit 5
A pair of intake doors 1 open and close an outside air inlet 8 opened in the peripheral wall and an inside air inlet 9 and 10 facing each other.
1.degree. 12, and a fan 14 whose driving source is a pro-ar motor 13.

An evaporator 20 of a vapor compression refrigeration cycle is disposed within the cooling unit 6, and an inlet tank 14 and an outlet tank 1 are disposed on both sides of the heater unit 7.
A heater core 16 having a diameter of 5 is disposed.

This heater unit 7 is of a so-called two-layer flow type, and the heater core 16 is disposed horizontally along the flow direction of the air supplied by the fan 14, and the heater core 16 is arranged horizontally along the upstream ventilation surface of the heater core 16. An upstream air guide 18 that divides the airflow surface 17 into two, and a downstream air guide 21 that divides the downstream ventilation surface 19 into two are provided. The upstream air guide 18 extends in the upstream direction along one side wall 22 of the casing 4, and defines a first introduction path 23 between it and the upstream ventilation surface 17,
Further, a second introduction path 24 is defined between the negative side wall 22 and the negative side wall 22 .

A first bypass path 26 is formed between the outlet tank 15 and the other side wall 25 of the casing 4, and a second bypass path 28 is formed between the introduction tank 14 and the rear wall 27 of the casing 4. ing.

The boss portion 29 formed in the derivation tank 15 has a first
A first air mix door 30 is provided as an operating means for opening and closing the introduction passage 23, and at the upstream end of the first bypass passage 26, in cooperation with the first air mix store 30,
A vent bypass door 31 is provided to open and close this first bypass passage 26, and further, at the edge of the introduction tank 14,
A second air mix door 32 is provided as an operating means for opening and closing the second bypass passage 28.

A first air mix chamber 33 and a second air mix chamber 34 are provided on both sides of the downstream air guide 21. The first air mix chamber 33 has a defrost outlet 35 oriented toward the front window.
A center ventilator outlet 36 located in the center and side ventilator outlets 37 and 37 located on both sides of an instrument panel disposed in the vehicle interior communicate with each other.

An air distribution control door 38 is provided between the side ventilator outlets 37, 37, and an air distribution control door 38 is provided at the downstream end of the first air mix chamber 33 for opening and closing the respective ventilator outlets 36, 37, 37. ventilator door 39
A defrost door 40 that opens and closes the defrost Suita port 35 is also provided.

The first option 2 air mix chamber 34 communicates with a foot outlet 41 provided at the lower part of the vehicle interior, and is also provided with a foot door 42 for opening and closing the foot outlet 41. 2nd air mix chamber 33
, 34 communicate with each other, a bypass door 43 is provided.

On the other hand, as shown in FIG. 1, a room temperature setting section 45 as a setting means is connected to the input port of the arithmetic and control unit 44, and an outside air sensor 465, a solar radiation sensor 47, as a detection means are connected. Room temperature sensor 48. A blowout temperature sensor 49 is connected via an A/D converter 50. The arithmetic and control device 44 is also provided with a reference target blowout temperature calculation circuit 51 that selects a reference target Suita temperature Tab based on the outside air temperature 'ra detected by the outside air temperature sensor 46.

The reference target outlet temperature Tdb is a function '! using the outside air temperature Ta, as illustrated by the dashed line in FIG.゛db=f
A value that provides good sensation when a harmonized wind blows from (Ta) is predetermined for each outside temperature 1'a.

[1 shot sensor 47 and reference target blowout temperature selection circuit 51]
On the output side, solar radiation ff1Z and standard target blowout temperature Tab
Using the equation (1) below, the solar radiation corresponding correction value 'r d b
A solar radiation correction target outlet temperature calculation circuit 57 is provided to calculate z.

1'dbz=Tdb-aZ -・・・・・・・・・(1
) (where a is a constant, for example 7/660)
The solar radiation correction target outlet temperature calculation circuit 57
<b, (for example b=to'c), Tdbz=
b, and has a function of calculating the lower limit value of the solar radiation corresponding correction value Tdbz by limiting it to a predetermined value b (10° C.) or more.

Furthermore, the arithmetic and control device 44 is provided with a target room temperature calculation circuit 52 that calculates a target room temperature TsO based on the set room temperature Ts output from the room temperature setting section 45 and the vehicle interior ITr detected by the room temperature sensor 48.

At the output stage of the target room temperature calculation circuit 52, a solar radiation corresponding correction value Tdbz, a target room temperature Tso, and a room temperature 'r' are output.

A target outlet temperature calculation circuit 53 is provided that calculates a target outlet temperature Tdo based on the set room temperature Ts using the following equation (2).

Tdo=Tdbz+c (Tso-'rr)+d (2
5-Ts) ・・・・・・・・・(2) (However, c,
Both d are constants, for example C1d=2) On the output side of the target outlet temperature calculation circuit 53, there is a comparison circuit 54 for comparing the target outlet temperature Tdo and the actual outlet temperature Td.
is provided. The comparison circuit 54 is provided with a drive circuit 56 that outputs a door opening degree signal according to the comparison result to a near mix door actuator 55 serving as a drive means.
are linked to the first and second air mix doors 30 and 32.

Next, the operation of this embodiment having the above configuration will be explained according to the flowchart shown in FIG.

When the air conditioning switch (not shown) is turned on, the arithmetic and control unit 44 is activated together with the air conditioning system main body 1, and the outside temperature Ta1 solar radiation ff
1Z, the vehicle interior temperature Tr, the outlet temperature Td, and the set room temperature Ts are read (step ■), and based on these values, the target room temperature Tso required to set the vehicle interior to the set temperature Ts is calculated (step ■). .

In the next step (2), the standard target outlet temperature Tdb (Z=0) corresponding to the outside temperature Ta at that time is selected according to the characteristics shown by the dashed line in FIG. , solar radiation correction value Tdbz
is calculated, and if the value of the solar radiation corresponding correction value Tdbz is 10°C or less, it is output limited to 10°C.

That is, as shown in detail in FIG.
Then, in step 402, it is determined whether Tdbz is larger than a predetermined value b (=10'C). Then, if this determination is YES, the Tdbz
The value of Tdbz=b (=10'C) is outputted as is, while if the answer is NO, it is outputted as Tdbz=b (=10'C) in step 403.

Then, in step ■ following step 403, the above (
The target blowout temperature Tdo is calculated using equation 2). At this time, the interior of the vehicle is in a cool-down state, and the temperature is T.
When r is a high temperature, (Tso-T
r) becomes a large negative value.

Therefore, even if the lower limit value of Tdbz is limited to lOoC, the target blowing temperature Tdo during cool-down can be set to a lower value than this, and excellent cool-down characteristics are ensured.

Also, during steady cooling after the end of cool-down, for example, assuming that the target room temperature Tso and the room 1iTr are all 25°C, c (Tso-Tr) in the above equation (2)
The value of +d (25-'rs) is O, and the value of the target blowout temperature T do depends only on T d b z'. During this steady cooling, day Q, fffi
is large, as can be understood from equation (1) above, the value of the solar radiation corresponding correction value T d b z is equal to the solar radiation ff1Z
decreases depending on the value of . However, as mentioned above, the lower limit value of the solar radiation correction value Tdbz is limited to lOoC as shown by the solid line in Fig. 5, and it cannot be lower than 10'C as in the conventional device shown by the two-dot chain line. Therefore, the target outlet temperature Tdo during steady cooling will not be as low as 10°C or lower, unlike the conventional device shown by the two-dot chain line (the target outlet temperature Tdo during steady cooling is , is set to a value of at least 1060 or more.

Then, in the next step (2), the target outlet temperature TdO is compared with the actual outlet temperature Td detected by the outlet temperature controller 49, and if Td o < Td, the IK
(Tdo-Td) Drive the air mix doors 30, 32 to the full cool side for 1 minute (Step ■), and Tdo>Td
If it is 1K (7do-Td)l, a command signal to drive to the full hot side (steel knob ■) is outputted to the air mixer door actuator 55 via the drive circuit 56.

Here, driving to the full cool side means air mix door 30
, 32 in a direction that reduces the amount of air passing through the heater core 16, and driving to the full hot side means rotating the air mix doors 30, 32 in a direction that increases the amount of air passing through the heater core 16. It means to do. Then, when Tdo=T'd by processing Ste knob ■ or ■, Air Mi Tuxtor 30.32 is fixed at the relevant position (
Ste.knob ■), the blowout temperature Td is maintained at the target blowout temperature Tdo.

At this target blowout temperature Tdo, during steady cooling,
As mentioned above, since it is maintained at at least 1000 or higher, the blowing temperature is also maintained at a value that does not feel uncomfortable,
This eliminates the disadvantage that the occupants are uncomfortable due to the low-temperature air being blown out for a long period of time during steady cooling as in the past.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention uses a solar radiation corresponding correction value calculated based on the amount of solar radiation for calculating the target outlet temperature by limiting its lower limit to a predetermined value or more. Under conditions where the value of the target air temperature is highly dependent on the solar radiation correction value, such as during steady cooling, it is possible to suppress an extreme drop in the target air temperature. Therefore, as a result of suppressing an extreme drop in the target air outlet temperature during steady cooling, the actual air outlet temperature is also maintained at a value that does not feel uncomfortable,
It is possible to eliminate the disadvantage that the passenger feels uncomfortable due to the low temperature air being blown out for a long time during steady cooling as in the conventional case.

Furthermore, under conditions where the room temperature is high, such as during cool-down, the value of the target outlet temperature is less dependent on the solar radiation correction value, so even if the lower limit of the solar radiation correction value is limited in this way, This makes it possible to obtain the same cool-dan characteristics as in the past, which is a problem.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a conceptual diagram of an air conditioner main body according to the embodiment, Fig. 3 is a flowchart showing the operation of the embodiment, and Fig. 4 is a flowchart of the same. FIG. 5 is a detailed flowchart of step (2) and a control characteristic diagram of the same embodiment. DESCRIPTION OF SYMBOLS 1... Air conditioner body, 30... First air mix door (tffi ([3R), 32... Second air mix store (operating element), 44... Arithmetic control unit, 45
. . . Room temperature setting unit (setting means), 46 . . . Outside air sensor, 48 . . . Room temperature sensor, 53 . Figure 4

Claims (1)

[Claims] (1) Detection means that detects physical environmental factors related to temperature and outputs them as electrical signals, and setting means that sends out electrical signals according to the setting operations by the occupants in order to set physical environmental factors related to temperature inside the vehicle interior. and a drive device that drives an operating element related to the blowout temperature provided in the air conditioner main body.
In the automatic air conditioner, the automatic air conditioner includes a calculation control device that executes calculations based on the output signals of the detection device and the setting device, and sends a command signal to the drive device based on the calculation results, wherein the detection device is configured to detect the amount of solar radiation. A solar radiation sensor is provided to detect the solar radiation, and the arithmetic and control device is provided with a solar radiation correction target blowout that calculates a solar radiation corresponding correction value based on the amount of solar radiation and limits the lower limit value of the calculated solar radiation corresponding correction value to a predetermined value or more. A blowout temperature control structure for an automatic air conditioner for a vehicle, characterized in that a temperature calculation circuit is provided, and a target blowout temperature calculation circuit is provided that calculates a target blowout temperature using the solar radiation corresponding correction value.