JP2002029238A - Vehicle air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the deterioration of air conditioning feeling at an open travel in an opened state of a roof in an air conditioner mounted on a vehicle having the openable/closeable roof. SOLUTION: The opened/closed state of the roof is judged, and the detection value of the indoor temperature immediately before the opened/closed state of the roof is held to control an air conditioning state if the roof is kept at an opened state. The indoor temperature for air conditioning control can be prevented from being quickly changed before and after the opening/closing of the roof regardless of changes of the external air temperature caused by a change of seasons, thereby the control of the air conditioning state can be prevented from being abruptly fluctuated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner mounted on a vehicle (a so-called open car) having a roof that can be opened and closed.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Application Laid-Open No. Hei 5-38926 proposes air conditioning control in an open car air conditioner. In this prior art, the target blowing temperature TAO of the air blown into the passenger compartment is set to a set temperature T set by an occupant.
When calculating based on the set, the inside temperature Tr, the outside temperature Tam, and the amount of solar radiation Ts, the gain corresponding to each sensor detection value of the inside temperature Tr, the outside temperature Tam, and the amount of solar radiation Ts is changed according to the open / close state of the roof. This aims to eliminate unnecessary air-conditioning operation when the roof is open and improve the energy saving effect.

[0003]

By the way, when the roof of an open car is opened, the atmosphere in the vehicle interior changes at once to a state similar to the outside air atmosphere by opening the roof.
The temperature inside the vehicle (inside temperature Tr) near the inside air sensor is the outside temperature T
It suddenly changes to almost the same value as am. The above prior art describes that when an open state of the roof (full open or semi-open state) is detected, the inside air gain corresponding to the detected value of the inside air sensor is changed to a smaller value than when the roof is closed. The value of the inside air gain after the change is a predetermined value set in advance, and is always a fixed value (fixed value) irrespective of a wide change in the outside air temperature due to a seasonal change.

As a result, there is a case where the value of the inside air gain after the change becomes an inappropriate value with respect to the change of the outside air temperature. In this case, the target outlet temperature TAO before and after the roof is opened and closed.
Abruptly changes, and the air-conditioning state in the vehicle compartment, that is, the blow-out temperature, the blow-out air amount, etc. fluctuate rapidly, and the air-conditioning feeling of the occupant is deteriorated.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide an air conditioner mounted on a vehicle having a roof that can be opened and closed so as to suppress a deterioration in air conditioning feeling when the roof is opened and the vehicle is running open. I do.

[0006]

According to the first aspect of the present invention, there is provided a vehicle air conditioner mounted on a vehicle having a roof (40) openable and closable. Is detected, and the air-conditioning state of the vehicle interior is controlled based on the vehicle interior temperature. When the open state of the roof (40) is determined, the roof (4)
The air conditioning state is controlled by holding the detected value of the vehicle interior temperature immediately before the opening state of 0).

[0007] Thus, it is possible to prevent a sudden change in the temperature of the vehicle interior for air-conditioning control before and after opening and closing the roof irrespective of changes in the outside air temperature due to seasonal changes. Therefore, it is possible to prevent a sudden change in the air-conditioning state of the vehicle interior and to suppress the deterioration of the air-conditioning feeling during the open running.

According to the second aspect of the present invention, the roof (4
In the vehicle air conditioner mounted on a vehicle configured to be able to open and close 0), at least the temperature of the vehicle interior is detected, and the air conditioning state of the vehicle interior is controlled based on the temperature of the vehicle interior. ) Immediately after the opening of the roof (40), the vehicle interior temperature used for controlling the air-conditioning state is taken as the vehicle interior temperature immediately before the opening of the roof (40).
0), the vehicle interior temperature used for controlling the air-conditioning state is gradually changed toward a corrected vehicle interior temperature calculated based on the actual vehicle interior temperature.

Thus, when the roof (40) is opened, the vehicle interior temperature used for controlling the air-conditioning state is reduced to the roof (4).
0) Since the vehicle interior temperature is changed gradually from the vehicle interior temperature immediately before the open state to the corrected vehicle interior temperature calculated based on the actual vehicle interior temperature, the vehicle interior temperature for air conditioning control suddenly changes before and after opening and closing the roof. Can be prevented. Therefore, it is possible to prevent a sudden change in the air-conditioning state of the vehicle interior and to suppress the deterioration of the air-conditioning feeling during the open running.

According to the third aspect of the present invention, if the set time (t0) is made longer as the opening of the roof (40) increases, the correction cabin is adjusted according to the degree of opening of the roof (40). By changing the calculated value of the temperature, fine air-conditioning control can be realized in consideration of the degree of opening of the roof (40).

As a heat exchange means for exchanging heat with air blown into the vehicle interior, a heat exchange means (13) for heating the air using hot water from a vehicle engine as a heat source. And the setting time (t0) is shortened as the temperature of the hot water rises.

This makes it possible to prevent the feeling from being deteriorated due to the feeling of excessive heating when the temperature of the hot water is high and the heating capacity is large, as exemplified in FIG. 9 described later.

According to the present invention, the target blow temperature of the air blown into the vehicle interior based on at least the vehicle interior temperature and the set temperature set by the occupant. May be calculated, and the air-conditioning state may be controlled based on the target outlet temperature.

In the invention according to claim 6, the roof (4
In the vehicle air conditioner mounted on a vehicle configured to be able to open and close 0), the target outlet temperature of the air blown into the vehicle interior based on at least the interior temperature of the vehicle and the set temperature of the interior of the vehicle set by the occupant. The air condition in the passenger compartment is controlled on the basis of the calculated target air temperature, and when the open state of the roof (40) is determined, the temperature is set higher than the set temperature immediately before the open state of the roof (40). Also, a correction set temperature approaching the outside air temperature is calculated, and a target outlet temperature is calculated using the correction set temperature.

Thus, after the roof (40) is opened, the target outlet temperature can be calculated based on the corrected set temperature that is closer to the outside air temperature than the set temperature before the roof (40) is opened. Therefore, even if the cabin temperature changes suddenly before and after the opening and closing of the roof (40), the sudden change in the cabin temperature is offset by the correction set temperature approaching the outside air temperature, so that a significant change in the target outlet temperature can be prevented. The deterioration of the air conditioning feeling during open running can be suppressed.

Preferably, the correction set temperature is calculated based on the outside air temperature and the comfortable reference temperature in the vehicle compartment. Here, the comfort reference temperature in the vehicle compartment may be a fixed value set in advance (for example, 25 ° C.), but the set temperature immediately before opening the roof (40) may be used as the comfort reference temperature.

According to this, the correction set temperature can be calculated according to the deviation between the outside air temperature and the comfort reference temperature in the vehicle interior.

The reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiments described later.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 is a schematic diagram of the overall configuration of a vehicle air conditioner according to a first embodiment of the present invention. It is composed of a unit 1 and an air conditioning unit 2.

The blower unit 1 comprises an inside / outside air switching box 3 and a blower 4, and the inside / outside air switching door 5 in the inside / outside air switching box 3 opens and closes the outside air inlet 6 and the inside air inlet 7. As a result, outside air (vehicle outside air) or inside air (vehicle inside air) is switched into the inside / outside air switching box 3. The inside / outside air switching door 5 is driven by an electric drive device 8 including a servomotor. The blower 4 is provided with a centrifugal blower fan 9 and a drive motor 10.

The air conditioning unit 2 is provided with an air conditioning case 2a forming an air passage. An evaporator (cooling heat exchange means) 11 of a refrigeration cycle is disposed upstream of the air conditioning case 2a. An air mix door 12 is disposed downstream. On the downstream side of the air mix door 12, a hot water heater core (heating heat exchange means) 1 for heating air using hot water (cooling water) of a vehicle engine as a heat source.
3 are installed. On the side (upper portion) of the hot water type heater core 13, a bypass passage 14 for flowing air while bypassing the hot water type heater core 13 is formed.

The air mix door 12 is a rotatable plate-like door, and is driven by an electric drive device 15 composed of a servomotor. The air mix door 12 adjusts the flow rate of the hot air passing through the hot water heater core 13 and the cool air passing through the bypass passage 14, and the air blown into the vehicle compartment by adjusting the flow rate of the cool / hot air. Adjust the temperature. Therefore, in this example, the air mix door 12
This constitutes a means for adjusting the temperature of the air blown into the vehicle interior.

On the downstream side of the hot water type heater core 13, a hot air passage 16 extending upward from below is formed. The hot air from the hot air passage 16 and the cool air from the bypass passage 14 are mixed in the air mixing section 17. Thus, air at a desired temperature can be produced.

Further, in the air-conditioning case 2a, a blowing mode switching unit is provided downstream of the air mixing unit 17. That is, a defroster opening 18 is formed in the upper surface of the air-conditioning case 2a, and the defroster opening 18 blows air to the inner surface of the vehicle windshield through a defroster duct (not shown). The defroster opening 18 is
It is opened and closed by a rotatable plate-shaped defroster door 19.

A face opening 20 is formed on the upper surface of the air-conditioning case 2a at a position rearward of the vehicle with respect to the defroster opening 18. The face opening 20 is connected to an upper body of an occupant of the vehicle interior through a face duct (not shown). It blows air toward. The face opening 20 is opened and closed by a rotatable plate-like face door 21.

In the air-conditioning case 2a, a foot opening 22 is formed below the face opening 20.
Air is blown from the foot opening 22 toward the feet of the occupant in the vehicle. The foot opening 22 is opened and closed by a rotatable plate-like foot door 23.

The above-mentioned blow mode doors 19, 21, 23
Are connected to a common link mechanism (not shown), and an electric drive 24 composed of a servomotor is connected via the link mechanism.
Driven by

Next, an outline of the electric control unit in this embodiment will be described.
It is composed of a well-known microcomputer such as an OM and a RAM, and its peripheral circuits. Evaporator 1
Temperature sensor 2 comprising a thermistor as temperature sensor 1
6. This temperature sensor 26 is used for the air conditioning case 2a.
The evaporator 11 is disposed at a position immediately after the air is blown out of the evaporator 11 and detects the evaporator blowout temperature Te.

The air-conditioning electronic control unit 25 includes, in addition to the temperature sensor 26, a well-known sensor 27 for detecting an internal temperature Tr, an external temperature Tam, a solar radiation amount Ts, a hot water temperature Tw, and the like for air-conditioning control. 30 to 30. The detection signal is input. The inside air sensor 27 that detects the inside temperature Tr is, for example,
It is arranged at the lower part (near the center cluster) of the center part in the left-right direction of the vehicle interior instrument panel, and detects the representative temperature in the vehicle interior as the internal temperature Tr.

The air-conditioning control panel 31 installed near the instrument panel in the passenger compartment is provided with operation switches 32 to 36 which are manually operated by an occupant.
The operation signal of 6 is also input to the air-conditioning electronic control device 25.

As the operation switches, specifically, a temperature setting switch 32 for generating a temperature setting signal Tset,
An air volume switch 33 for generating an air volume switching signal, a blow mode switch 34 for generating a blow mode signal, an inside / outside air switch 35 for generating an inside / outside air switching signal, and an air conditioner for interrupting the operation of a compressor (not shown) of a refrigeration cycle. A switch 36 and the like are provided.

Further, a detection signal of the roof switch 38 is inputted to the electronic control unit 25 for air conditioning. Here, FIG.
2 is a vehicle in which the roof 40 is configured to be openable and closable, that is, a so-called open car. FIG. 2A shows a closed (fully closed) state of the roof 40, and FIG.
0 is stored in the storage space at the rear of the vehicle (open)
Indicates the status. The roof 40 is in the fully closed position shown in FIG.
It is also possible to select a semi-open state intermediate between the fully open position of (b).

The roof switch 38 is connected to such a roof 4
In this example, the roof switch 38 is opened (OFF) when the roof 40 is closed in this example.
When the roof 40 is opened by a predetermined opening degree or more, the roof switch 38 is closed (ON).

Next, the operation of the present embodiment in the above configuration will be described. The flowchart of FIG. 3 shows an outline of the control processing executed by the microcomputer of the air-conditioning electronic control unit 25. The control routine of FIG. 3 turns on the ignition switch of the vehicle engine (not shown) and supplies power to the control unit 25. Start when done.

First, in step S1, flags, timers and the like are initialized, and in the next step S2, operation signals of the operation switches 32-36 of the air-conditioning control panel 31 are read. In the next step S3, a signal of the vehicle environment state, that is, a detection signal from the sensors 26 to 30, a detection signal of the roof switch 38, and the like are read.

Subsequently, in step S4, a target blowing temperature TAO of the conditioned air blown into the vehicle compartment is calculated. The target outlet temperature TAO is an outlet temperature required to maintain the vehicle interior at the set temperature Tset of the temperature setting switch 32, and is calculated based on the following equation (1).

[0037]

## EQU1 ## TAO = Kset × Tset−Kr × Tr−Kam ×
Tam−Ks × Ts + C where, Tr: internal temperature detected by the internal air sensor 27 Tam: external temperature detected by the external air sensor 28 Ts: solar radiation detected by the solar radiation sensor 29 Kset, Kr, Kam, Ks: control Gain C: Correction Constant Next, in step S5, a target air blowing amount of the air blown by the blower 4, specifically, a blower voltage level which is a voltage applied to the blower driving motor 10 is determined based on the TAO. I do. As shown in FIG. 4, the blower voltage level is increased by increasing the blower voltage level on the high-temperature side (maximum heating side) and the low-temperature side (maximum cooling side) of the TAO so that the maximum air flow (H
i), and the blower voltage level is reduced in the intermediate temperature range of the TAO to obtain the minimum air volume (Lo).

Here, the blower voltage level is the maximum air volume (H
In order to control the air volume in multiple stages between I) and the minimum air volume (LO), there are multiple stages (for example, 31 stages) according to TAO.
To change. In the example of FIG. 4, the maximum air flow (H) on the high temperature side (maximum heating side) of the TAO is described.
i) is the maximum air flow (Hi) on the low temperature side (maximum cooling side)
It is slightly smaller.

Next, in step S6, the inside / outside air mode is determined. In the inside / outside air mode, for example, the inside air mode is set when the inside temperature Tr is higher than or equal to a predetermined temperature with respect to the set temperature Tset and is significantly higher (at the time of a high cooling load). Alternatively, as the TAO increases from the low temperature side to the high temperature side, the entire inside air mode → the inside / outside air mixing mode →
The setting may be switched to the all outside air mode.

Next, in step S7, the blowing mode is determined according to the TAO. As is well known, as the TAO rises from the low-temperature side to the high-temperature side, the blowing mode is switched and set in the face mode → the bi-level mode → the foot mode.

Next, in step S8, the target opening degree SW of the air mix door 12 is set to the above TAO and the evaporator outlet temperature T.
e, and the hot water temperature Tw is calculated by the following equation (2).

[0042]

## EQU2 ## SW = [(TAO-Te) / (Tw-Te)]
× 100 (%) Here, the target opening degree SW of the air mix door 12 is 0% at the maximum cooling position (solid line position in FIG. 1) of the air mix door 12, and the maximum heating position of the air mix door 12 (FIG. 1).
(Dashed-dotted line position) is 100%.

Then, the process proceeds to a step S9, wherein the temperature sensor 2
6 to determine the voltage applied to the electromagnetic clutch of the air-conditioning compressor (not shown) by comparing the actual evaporator outlet temperature Te detected by 6 with the target evaporator temperature TEO determined based on the TAO and the like. Intermittent compressor operation (ON-OFF)
To determine.

Next, proceeding to step S10, the control state determined in steps S5 to S9 is obtained.
Control signals are output to various actuator units (8, 10, 15, 24, etc.). In the next step S11, the control cycle τ
When it is determined that the control period τ has elapsed, the process returns to step S2.

FIG. 5 shows a specific example of the TAO calculation method in step S4. First, in step S41, it is determined whether or not the roof 40 of the vehicle is in an open state based on a signal from the roof switch 38. When the roof 40 of the vehicle is in the open state, in the next step S42, the TAO using the detection value Tr0 of the inside air sensor 27 immediately before the open state of the roof 40 is used as the internal temperature Tr in Expression 1 above.
Is calculated.

That is, when calculating the TAO when the roof is opened, the TAO is calculated while holding the inside air temperature Tr at the inside air sensor detection value Tr0 immediately before the roof is opened.
Therefore, even if the periphery of the inside air sensor 27 suddenly changes to the outside air atmosphere at once with the opening of the roof, and the detection value of the inside air sensor 27 changes suddenly, the TAO calculation value does not change abruptly before and after the opening of the roof, and is substantially constant. Is maintained.

As a result, it is possible to prevent a large change in the blown air temperature and the blown air amount due to a change in TAO before and after the roof is opened.

Note that the actual inside air sensor 2 is
The detection value (raw value) of No. 7 is applied to the above equation 1 as it is and T
When the AO is calculated, the following behavior occurs to deteriorate the air conditioning feeling. For example, when the roof 40 is opened at a high outside air temperature in summer, the ambient temperature around the inside air sensor 27 rapidly rises to a temperature near the outside air temperature at once, and the detection value of the inside air sensor 27 rises rapidly. As a result, TAO
Sharply decreases to lower the blowout temperature and increase the blowout airflow.

Then, even when the roof is opened, the detection value of the inside air sensor 27 decreases due to the effect of the low-temperature large-volume blown air, so that TAO rises to increase the blow-out temperature and decrease the blow-out air volume. In this manner, a vicious cycle (hunting) of a sudden change in the detection value of the inside air sensor 27 with the opening of the roof → a sudden change in the TAO → a sudden change in the air-conditioning state (blowing temperature, blowing air volume) → a sudden change in the detection value of the inside air sensor 27 ) Occurs to deteriorate the air conditioning feeling.

However, according to the first embodiment, the internal temperature T
By maintaining r at the inside air sensor detection value Tr0 immediately before the roof opening state and calculating TAO, it is possible to prevent a sudden change in the air conditioning state (blowing temperature, blowing air volume) when the roof is opened.

In step S41, the vehicle roof 40
If it is determined that is not in the open state, step S43
And applying the actual detection value (raw value) of the inside air sensor 27 as the inside air temperature Tr in the above-described formula 1, and calculating TAO based on the sensor detection value (raw value),
Perform air conditioning control as usual.

The roof 4 determined in step S41
The open state of 0 is not limited to the fully open state of the roof 40, and a partially open state having a predetermined opening degree (for example, an opening degree of 50%) or more may be determined as the roof open state. .

(Second Embodiment) In the first embodiment described above, the case where the TAO is calculated while holding the inside air sensor detection value Tr0 immediately before the roof is opened when the roof 40 is opened has been described. Calculates TAO based on the corrected inside air temperature Trx calculated based on the detected value Tro of the inside air sensor immediately before the roof opening state and the actual detected value (raw value) Trn of the inside air sensor 27 when the roof 40 is opened. It is.

FIG. 6 shows the control (TAO calculation method) according to the second embodiment. When the roof 40 is opened, the corrected internal temperature Trx is calculated by the following equation 3 in step S44, and the corrected internal temperature Trx is calculated in the next step S45. TAO is calculated using the temperature Trx.

[0055]

## EQU3 ## Trx = (t / t0) × Trn + ｛(t0−
t) / t0｝ × Tr0 Here, t: elapsed time after opening of the roof 40 t0: predetermined set time Trn: actual detected value of the inside air sensor Tr0: detected value of the inside air sensor immediately before the roof is opened. t0 is a time required to smoothly transition the internal temperature Tr used for calculating TAO when the roof is opened from Tr0 to Trn without causing a rapid change in TAO, and is, for example, about 15 to 20 minutes.

According to the above equation (3), immediately after the roof is opened (t
= 0), Trx = Tr0, and Trx gradually approaches the actual inside air sensor detected value (raw value) Trn as time t elapses, and when the elapsed time t reaches the set time t0, Trx = Tr0. Trn.

As described above, also in the second embodiment, immediately after the roof is opened, the corrected inside air temperature Trx becomes the inside air sensor detection value Tr0 immediately before the roof is opened, and thereafter, the set time t0
And the corrected inside air temperature Trx becomes the actual inside air sensor detection value T.
rn gradually approaching, so TAO when the roof is opened
Does not change suddenly compared to before the roof is opened. Therefore, it is possible to prevent a sudden change in the air-conditioning state (blowing temperature, blowing air volume) due to a sudden change in TAO when the roof is opened,
The deterioration of the air conditioning feeling when the roof is opened can be suppressed.

(Third Embodiment) In the above-described second embodiment, when calculating the corrected inside air temperature Trx by the equation 3,
Although the set time t0 is a predetermined fixed value, in the third embodiment, the set time t0 is varied according to the opening LN of the roof 40 as shown in the map of FIG.

Accordingly, in the third embodiment, instead of the roof switch 38, an opening sensor capable of continuously detecting the opening LN of the roof 40 of the vehicle is used, and based on the detected opening of the opening sensor, the opening sensor shown in FIG. The set time t0 is lengthened as the opening LN of the roof 40 increases as in the map of FIG. Specifically, when the opening degree LN of the roof 40 is 50%, the set time t0
= 15 minutes, and when the opening degree LN of the roof 40 becomes 100%, the set time t0 = 20 minutes.

The greater the opening LN of the roof 40, the more the ambient temperature around the inside air sensor 27 tends to approach the outside temperature. Therefore, the larger the opening LN of the roof 40, the more the inside air before and after opening and closing the roof 40. The range of change in the detection value of the sensor 27 increases.

Therefore, in the third embodiment, in consideration of the above points, the set time t0 is made longer as the opening LN of the roof 40 increases. Thereby, the corrected inside air temperature Trx is gradually changed from the inside air sensor detection value Tr0 immediately before the roof opening to the actual inside air sensor detection value (raw value) Trn by an appropriate set time t0 according to the roof opening degree LN. be able to.

(Fourth Embodiment) In the above-described third embodiment, the calculation of the corrected inside air temperature Trx requires the set time t0.
Is changed in accordance with the opening LN of the roof 40,
In the embodiment, the set time t0 is varied according to the hot water temperature Tw of the hot water heater core 13 as shown in FIG.

More specifically, when Tw = 10 ° C., the set time t0 is set to 20 minutes, the set time t0 is shortened as the hot water temperature Tw increases, and Tw = 80
When the temperature is ° C, the set time t0 is 15 minutes. The reason why the set time t0 is shortened as the hot water temperature Tw increases as described above will be described below.

At the time of low outside air temperature in winter, the hot water temperature T
When w is low, the temperature of the air blown out of the heater core 13 becomes low, and the heating capacity is inevitably reduced. Control (warm-up control) for gradually increasing the amount of air blown into the vehicle interior.

The third embodiment is effective in the warm-up control at the time of such a low outside temperature. In the third embodiment, the corrected inside temperature Trx is calculated by the following equation (4).

[0066]

## EQU4 ## Trx = (t / t0) × ｛Trc + (Trn−
Trc) / 2｝ + ｛(t0−t) / t0｝ × Tr0 where t: elapsed time after opening of the roof 40 t0: preset time Trn: actual detection value of the inside air sensor Tr0: roof open state The immediately preceding inside air sensor detection value Trc: a predetermined comfort reference temperature in the vehicle interior (for example, 25
(° C.) According to the above-described Expression 3, when the set time t0 elapses after the roof 40 is opened, the corrected inside air temperature Trx reaches the actual inside air sensor detection value (a temperature almost close to the outside air temperature) Trn. When the outside air temperature is low, the corrected inside air temperature Trx finally reaches a low temperature of, for example, 5 ° C. However, if such a low temperature is used as the internal air temperature Tr used for calculating the TAO, the TAO becomes excessively high and the air conditioning control becomes inappropriately warm.

Therefore, in the third embodiment, when calculating the corrected internal air temperature Trx as shown in the above equation 4, the corrected internal air temperature Trx is changed to Trc + (Trn−
Trc) / 2 is changed so as to reach the final value.
Specifically, when Trc = 25 ° C. and Trn = 5 ° C., Trx reaches 15 ° C. after a lapse of a set time t0.

FIG. 9 shows the corrected internal temperature Trx and the target outlet temperature TAO when the vehicle engine is started and the air conditioner is started after the roof 40 is left open while the outside temperature Tam = 5 ° C. , And changes in the blower voltage (the amount of air blown into the vehicle compartment). Note that FIG.
In the lower blowing air volume, the one-dot chain line shows the air volume change of the warm-up control when the hot water temperature Tw is low (for example, Tw = 10 ° C.), while the solid line shows the case where the vehicle engine is restarted after a short stop after a short stop. Thus, the change in the air volume when the hot water temperature Tw of the hot water heater core 13 is already high from the start of air conditioning (for example, Tw = 80 ° C.) is shown.

Here, if a constant value (for example, 20 minutes) is used as the set time t0 regardless of the level of the hot water temperature Tw in Equation 4, the corrected internal air temperature Trx becomes the final corrected temperature (in the above example). And 15 ° C.) is constant regardless of the level of the hot water temperature Tw. That is, the solid line in the upper part of FIG. 9 is a change in the corrected internal air temperature Trx when the set time t0 = 20 minutes, and the Trx reaches the final corrected temperature at time t5 after the start of the air conditioner.

With the change (increase) of the corrected internal temperature Trx, the target outlet temperature TAO changes (decreases) as shown in the middle part of FIG. Here, the predetermined temperature a shown in the middle part of FIG.
When TAO is higher than (same as the predetermined temperature a in FIG. 4), the blower voltage (blowing air volume) becomes the highest value (Hi) as shown in the lower part of FIG.

Therefore, when the set time t0 = 20 minutes, the state of the blown air volume = Hi is continued from time t1 to t4.
At that time, when Tw = 80 ° C., the high-temperature warm air is continuously blown out to the feet of the occupant for a long time, so that the feeling of heating becomes excessive,
Worse feeling.

On the other hand, when Tw = 80 ° C., if the set time t0 is reduced to 15 minutes, Trx reaches the final correction temperature at time t3 after the start of the air conditioner. TAO drops below a predetermined temperature a at time t2. Therefore, from time t2, the blower voltage (blowing air volume) starts to fall below the maximum value (Hi). Therefore, when Tw = 80 ° C., that is, when the temperature of the hot air blown into the vehicle compartment is high and the heating capacity is large, the blown air volume = Hi.
Is shortened between times t1 and t2. as a result,
Deterioration of feeling due to excessive heating feeling can be avoided.

(Fifth Embodiment) In all of the first to fourth embodiments described above, the deterioration of the air conditioning feeling when the roof is opened is suppressed by the correction control of the inside air temperature (the detection value of the inside air sensor 27) when the roof is opened. However, the sixth embodiment suppresses the deterioration of the air conditioning feeling when the roof is opened by the correction control of the set temperature Tset, which is based on the following concept.

That is, the set temperature Tset of the vehicle interior temperature
Is usually set to a temperature around 25 ° C. by the occupant, but when the occupant opens the roof 40, the occupant determines that the state of the outside air matches his / her own feeling. Can be considered.

Therefore, in the fifth embodiment, when the roof is opened, the set temperature Tset is corrected so as to approach the outside air temperature. FIG. 10 shows a control example of the fifth embodiment.
If it is determined in step S41 that the roof 40 has been opened, the process proceeds to step S46, in which the correction set temperature Tsetx is calculated as a function of the outside air temperature Tam. Specifically, the correction set temperature Tsetx when the roof is opened is calculated by the following equation (5).

[0076]

Tsetx = Trc + α × (Tam−Trc) 0.00 mm 22.20 mm; text-indent: −4.44 mm ”> where Tr
c: Predetermined comfort reference temperature in the cabin (for example, 25 ° C.) α: Preset coefficient (where 0 <α <1) In the above equation 5, when α = 0.5 and Trc = 25 ° C. For example, if Tam = 32 ° C. (during high summer outside temperature), Tsetx = 28.5 ° C. vice versa,
If Tam = 15 ° C (middle season of spring and autumn), Tset
x = 20 ° C. As described above, in step S46 with the opening of the roof, the correction set temperature Tsetx that causes the comfort reference temperature Trc in the vehicle compartment to approach the outside temperature is calculated.

Here, before the roof is opened, the set temperature T
The set is usually set to a value around 25 ° C. by the occupant (ie, T
(value near rc), so that step S46 is performed.
Then, the correction set temperature Tsetx approaching the outside temperature from the set temperature Tset before the roof is opened is calculated.

In the next step S47, the set temperature Tset
TAO is calculated using the correction set temperature Tsetx. Here, since the inside temperature Tr uses the actual detection value (raw value) detected by the inside air sensor 27, the detection value (raw value) Tr of the inside air sensor 27 rapidly changes to the outside temperature Tam with the opening of the roof. Change towards. However, the correction set temperature Tsetx corrected in the direction approaching the outside air temperature with opening the roof is used as the set temperature, and the set temperature gain Kset is usually about twice as large as the inside air gain Kr. (Raw value) Tr
Can be offset by the correction of the set temperature.
Thereby, it is possible to prevent the TAO from suddenly changing before and after the roof 40 is opened, and to suppress deterioration of the air conditioning feeling.

In the equation 5 of the fifth embodiment, a fixed value (for example, 25 ° C.) set in advance is used as the comfort reference temperature Trc in the vehicle compartment. Set temperature Tset
May be used. Similarly, in Expression 4 of the fourth embodiment, the set temperature Tset immediately before the roof 40 is opened may be used as the comfortable reference temperature Trc.

(Other Embodiments) In the example shown in FIG. 2 described above, a vehicle in which the roof 40 is movably mounted on the vehicle body and the roof 40 can be opened and closed has been described. Of course, the present invention can be applied to a vehicle that is detachably attached to a part. In this case, the state in which the roof 40 is attached to the ceiling of the vehicle body is defined as a closed state of the roof 40, and the roof 4 is closed.
A state in which the roof 40 is removed from the ceiling of the vehicle body may be determined as an open state of the roof 40.

In the third embodiment, the opening L of the roof 40
Although the set time t0 is lengthened as N increases,
The vehicle speed may be detected instead of the opening LN of the roof 40, and the set time t0 may be set longer as the vehicle speed increases. Further, the set time t0 may be made longer in accordance with an increase in both the opening degree LN of the roof 40 and the vehicle speed.

One or both of the opening LN of the roof 40 and the vehicle speed, and the hot water temperature Tw according to the third embodiment.
May be combined to determine the set time t0.

Although only the case where the raw sensor value is directly used as the detection value Tr of the inside air sensor 27 has been described, a relaxation process (gradual change process such as a time constant process) for reducing a change in the raw sensor value is performed as necessary. Then, the value subjected to the relaxation processing may be used as the detection value Tr of the inside air sensor 27.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a convertible car to which the first embodiment is applied.

FIG. 3 is a flowchart illustrating overall control according to the first embodiment.

FIG. 4 is a control characteristic diagram of a blower voltage level in the first embodiment.

FIG. 5 is a flowchart illustrating control of a main part of the first embodiment.

FIG. 6 is a flowchart illustrating control of a main part of the second embodiment.

FIG. 7 is a characteristic diagram of a set time for calculating a corrected internal temperature according to a third embodiment.

FIG. 8 is a characteristic diagram of a set time for calculating a corrected internal temperature according to a fourth embodiment.

FIG. 9 is an explanatory diagram of an operation according to a fourth embodiment.

FIG. 10 is a flowchart illustrating control of a main part of the fifth embodiment.

[Explanation of symbols]

4 ... Blower (Blower), 11 ... Evaporator (Heat Exchanger), 13 ... Heater Core (Heat Exchanger), 40 ... Roof.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Takamasa Kawai 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Corporation (72) Inventor Tomohiro Inagaki 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Denso Corporation (72) Inventor Yoshihisa Shimada 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F-term (reference) 3L011 AF02

Claims (7)

[Claims] 1. A vehicle air conditioner mounted on a vehicle configured to open and close a roof (40), wherein at least a vehicle interior temperature is detected, and an air conditioning state in the vehicle interior is controlled based on the vehicle interior temperature. When the open state of the roof (40) is determined, the air-conditioning state is controlled by holding the detected value of the vehicle interior temperature immediately before the open state of the roof (40). Vehicle air conditioners. 2. A vehicle air conditioner mounted on a vehicle having a roof (40) openable and closable, wherein at least a vehicle interior temperature is detected, and an air conditioning state in the vehicle interior is controlled based on the vehicle interior temperature. Immediately after the roof (40) is opened, the vehicle interior temperature used for controlling the air-conditioning state is set as the vehicle interior temperature immediately before the roof (40) is opened, and after the roof (40) is opened, The vehicle interior temperature used for controlling the air-conditioning state is gradually changed over a set time (t0) toward a corrected interior temperature calculated based on an actual interior temperature. Air conditioner. 3. The vehicle air conditioner according to claim 2, wherein the set time (t0) is made longer as the opening of the roof (40) increases. 4. Heat exchange means (13) for heating air using hot water from a vehicle engine as a heat source as heat exchange means for exchanging heat with air blown into the vehicle interior, wherein the temperature of the hot water rises. The set time (t)
The vehicle air conditioner according to claim 2, wherein 0) is shortened. 5. A method for calculating a target outlet temperature of air blown into the vehicle interior based on at least the vehicle interior temperature and a set temperature set by an occupant, and controlling the air conditioning state based on the target outlet temperature. The vehicle air conditioner according to any one of claims 1 to 4, characterized in that: 6. A vehicle air conditioner mounted on a vehicle having a roof (40) configured to be openable and closable, wherein the air is blown into the vehicle interior based on at least a vehicle interior temperature and a vehicle interior set temperature set by an occupant. Calculating the target air temperature of the air to be blown, controlling the air-conditioning state of the vehicle interior based on the target air temperature, and further determining the open state of the roof (40) when the open state of the roof (40) is determined. 40) A vehicle air conditioner which calculates a correction set temperature approaching to the outside air temperature from the set temperature immediately before the open state of 40), and calculates the target outlet temperature using the corrected set temperature as the set temperature. . 7. The air conditioner for a vehicle according to claim 6, wherein the correction set temperature is calculated based on the outside air temperature and a comfortable reference temperature in a vehicle cabin.