JPH0825942A - Air-conditioning control device - Google Patents

Abstract

PURPOSE:To improve operability by correcting an integrated signal so as to correspond to the change point of a specified operating quantity characteristic in the case of judging air-conditioning capacity to be fixed and the integrated signal to have been changed by human initiation. CONSTITUTION:Various doors 5, 16, 22, 23, the electromagnetic clutch 14 of a compressor 9, and the motor 7a of a blower 7 are controlled on the basis of an output signal from a control unit 25. A multiplexer 29 receives a signal from an outside air temperature sensor 31 for detecting outside air temperature, a signal from a cabin internal temperature sensor 32 for detecting the cabin internal temperature, and a signal (integrated signal) from a solar radiation sensor 33 for detecting the quantity of solar radiation. A microcomputer 27 receives a signal from a control panel 35 for outputting a control command by the operation of an occupant. In the case of judging air-conditioning capacity to be fixed and the integrated signal to have been changed by the operation of the occupant, the integrated signal is corrected so as to become the integrated signal corresponding to the change point of an operating quantity characteristic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is used in vehicles and the like.
The present invention relates to an air conditioning control device that controls the air-conditioned space.

[0002]

2. Description of the Related Art As an air conditioner for automatic control, an air conditioner that variably controls a blower (blower voltage) and a heating / cooling capacity so that an air-conditioned space has a comfortable temperature is disclosed in, for example, Japanese Patent Publication No. 5-25.
It is known in Japanese Patent Publication No. 26, etc. In this publication, in an air conditioner that air-conditions a passenger compartment, a comprehensive signal (a signal calculated based on a passenger compartment temperature, an outside air temperature, an amount of solar radiation, and a set temperature) that is correlated with a heat load is used as an outlet temperature blown from an outlet. The calculation is performed and the opening degree of the air mix door and the blower voltage are controlled based on the blowout temperature.

[0003]

However, in the conventional air conditioner in which the operation amount of the air conditioner is determined by the total signal as described above, for example, the blower voltage characteristic and the air mix door opening degree shown in FIG. Many of the characteristics, such as the characteristics, have been determined in advance for the total signal. When the total signal is calculated, the blower voltage and the air mix door opening are determined from the values, but the outside air temperature is -10 °.
When the temperature is extremely low, ie, C or less, the heating capacity is kept high even when the stable state is reached, the blower voltage is maximized, and the air mix door is fully heated. In such a case, even if the set temperature is lowered slightly due to a request to lower the room temperature a little, the total signal does not change so much as to get out of the area where the heating capacity is maximized, and therefore the set temperature is considerably reduced. Unless it is lowered (in the worst case, the setting temperature is not lowered to MAX-COOL which is the lowest), the air conditioning capacity cannot be changed, and the operability is poor. In addition, the same inconvenience can be said when the cooling capacity is fixed at the maximum at the extremely warm time.

The state in which the air conditioning capacity is fixed in this way is not limited to extremely warm and cold conditions, and when the temperature inside the vehicle is largely deviated from the target temperature, the process for rapidly bringing the temperature inside the vehicle to the target temperature is performed. It also occurs during so-called cool down and warm up. Even when the air conditioning capacity is temporarily fixed in such a transitional state that reaches a stable state, a request for changing the air conditioning capacity is conceivable similarly to the above, and it is necessary to be able to cope with this.

Further, if the sensor for detecting the calculation factor of the total signal fails, the total signal will change only within the range of the characteristic region where the operation amount of the air conditioner is constant, and the set temperature can be changed. It is possible that the air conditioning capacity cannot be changed even if the air conditioning capacity is changed.

Therefore, in the present invention, even if the air conditioning capacity is fixed, if there is a request for artificially changing the air conditioning capacity, even if the change is slight, the air conditioning capacity can be varied. It is an object to provide a good air conditioning control device.

[0007]

SUMMARY OF THE INVENTION The applicant has found that even if the set temperature is slightly changed, the air conditioning capacity may be fixed without changing the operation amount of the air conditioning equipment. When the air conditioning capacity is fixed, if the total signal at the stage of capacity change request is shifted to a value corresponding to the change point of the operation amount of the air conditioning equipment, the operation amount is changed according to the change of the set temperature. In view of the fact that it can be done, the present invention has been completed.

That is, the air-conditioning control device according to the present application automatically controls an air-conditioning device involved in air-conditioning the air-conditioned space so that a predetermined operation amount characteristic is obtained by a comprehensive signal calculated based on various factors related to heat load. In the control device, first determining means for determining that the air conditioning capacity is fixed, second determining means for determining whether or not the total signal is artificially changed, and the first determining means. If the air conditioning capacity is fixed at, and the second determining means determines that the total signal is artificially changed, the total signal is changed to the total signal corresponding to the change point of the predetermined operation amount characteristic. And a correcting means for correcting the above. (Claim 1)

As a concrete mode, in an air conditioning control device for automatically controlling an air conditioner involved in air conditioning of an air-conditioned space so as to obtain a predetermined operation amount characteristic by a comprehensive signal calculated based on various factors relating to heat load. First determining means for determining that the operation amount of the air conditioner obtained based on the total signal is in the invariant region of the operation amount characteristic, and the air-conditioned space which is one of the calculation factors of the total signal The second determining means for determining that the set temperature of No. 1 has been changed, the third determining means for determining whether the air conditioning control of the air-conditioned space is in a stable state, and the first determining means When it is determined that the operation amount of the air conditioner is in the invariable region, the second determination unit determines that the set temperature is changed, and the third determination unit determines that the air conditioning control is in a stable state. To the above settings Correction means for correcting the total signal to be the total signal corresponding to the change point, with the difference between the total signal at the time of changing the degree and the total signal corresponding to the change point of the predetermined operation amount characteristic as a correction amount. It may be an air-conditioning control device having (Claim 2).

Further, a first judging means for judging that the operation amount of the air conditioner obtained based on the comprehensive signal within a predetermined time is in the invariable region of the operation amount characteristic, and at least one of the comprehensive signals. A second determining means for determining that one of the calculation factors is artificially changed, and the first determining means determines that the operation amount of the air conditioner is in an invariable region,
When the second determining means determines that the calculation factor is artificially changed, a total signal at the time when the calculation factor is changed and a total signal corresponding to a change point of the predetermined manipulated variable characteristic. The air-conditioning control device may include a correction unit that corrects the total signal so as to become the total signal corresponding to the change point by using the difference of (1) as a correction amount (claim 3). In this case, determination means for determining whether or not the detector for detecting the environmental condition affecting the total signal is defective may be added (Claim 4). You may provide the means to display.

[0011]

Therefore, when the first determining means determines that the air conditioning capacity is fixed and the second determining means determines that the total signal is artificially changed, the correcting means determines the total signal. Is corrected so that it becomes a total signal corresponding to the change point of the predetermined operation amount characteristic, so even if the total signal slightly deviates from it, the operation amount of the air conditioning equipment can be changed, and the air conditioning capacity is fixed. If there is an artificial change request, it can respond to the situation even when the situation is high.

Further, under the condition that one calculation factor of the total signal shows an extreme value, the operation amount of the air conditioner scheduled for the total signal may not change even in the stable state. For example, if the air-conditioned space is a vehicle compartment and the outside air temperature, which is one of the calculation factors of the overall signal, is extremely low,
Even in the stable state, the operation amount of the air conditioner determined based on the total signal is fixed to the state where the heating capacity is maximized. In such a case, if the control of the configuration as claimed in claim 2 is used, by the operation of changing the set temperature in the vehicle interior,
Since the comprehensive signal is corrected to the position corresponding to the change point of the manipulated variable characteristic, it is possible to change the air conditioning capacity in response to the temperature change request of the occupant.

Further, although the operation amount of the air conditioner is not fixed in the stable state of the air conditioning, the operation amount is fixed in order to maximize the air conditioning capacity in the transition period until reaching the stable state, or the total signal Since the sensor for detecting the calculation factor has failed, the total signal becomes difficult to change, and therefore, the total signal may be variable only in a region where the operation amount does not change. In such a case, if the control having the configuration as claimed in claim 3 is used, the total signal is similarly corrected to a value corresponding to the change point of the manipulated variable characteristic by an artificial ability change request, so that the change request is requested. The air conditioning capacity can be changed accordingly. Here, as in claim 4, if it is possible to determine that the detector that detects the environmental condition that affects the overall signal is in failure, the fixed state of the manipulated variable is caused by the failure of the detector. It is possible to determine whether the cause is the cause or another factor.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, the vehicle air conditioner is provided with an intake door switching device 2 on the most upstream side of an air conditioning duct 1. The intake door switching device 2 is divided into an inside air inlet 3 and an outside air inlet 4. The inside / outside air switching door 5 is disposed in the open portion, and the inside / outside air switching door 5 is operated by the actuator 6 to select the air introduced into the air conditioning duct 1 between the inside air and the outside air, and the desired intake mode is selected. Is obtained.

The blower 7 sucks air into the air conditioning duct 1 and blows the air downstream, and an evaporator 8 is arranged behind the blower 7. The evaporator 8 is connected to a compressor 9, a condenser 10, a receiver tank 11 and an expansion valve 12 by piping to form a cooling cycle, and the compressor is connected to an engine 13 of a vehicle via an electromagnetic clutch 14. Is operated by connecting and disconnecting the electromagnetic clutch 14,
Stop control is performed.

The high-temperature and high-pressure refrigerant compressed by the compressor 9 dissipates heat when passing through the condenser 10 and is condensed, and adiabatically expanded by the expansion valve 12 to become a mist-like refrigerant. The atomized refrigerant absorbs heat when passing through the evaporator 8, evaporates and vaporizes. By repeating the heat absorbing action of the evaporator 8 and the heat dissipating action of the capacitor 10, the evaporator 8
It is designed to cool the air passing through.

A heater core 15 is arranged behind the evaporator 8 and an air mix door 16 is provided on the upstream side of the heater core 15, and the opening degree of the air mix door 16 is adjusted. By adjusting with the actuator 17, the ratio of the air passing through the heater core 15 and the air bypassing the heater core 15 is changed, whereby the temperature of the blown air is controlled.

The air mix door 16 opens when the air ratio for bypassing the heater core 15 is maximum (the air ratio passing through the heater core is minimum or the air passing through the heater core is exhausted) when the opening is 0%. At 100%, the air ratio passing through the heater core 15 is maximum (the air ratio bypassing the heater core is minimum, or the bypass air is exhausted).

On the downstream side of the air-conditioning duct 1, a defrost outlet 18 (in the figure, it is opened in a horizontal direction for convenience, but it is actually provided facing the windshield) and a vent outlet are provided. The passenger compartment 2 through an outlet 19 (opened to face the upper half of the occupant) and a heat outlet 20 (opened to face the lower half of the occupant)
The opening mode is changed by controlling the opening and closing of the mode doors 22 and 23 provided at the divided portions of the outlets 18 to 20 by the actuator 24.

The various doors 5, 16, 22, 2
3. The electromagnetic clutch 14 of the compressor 9 and the motor 7a of the blower 7 are controlled based on an output signal from the control unit 25. This control unit 25
Is a drive circuit 26 for driving and controlling the actuators 6, 17, 24, the electromagnetic clutch 14, and the motor 7a of the blower.
a to 26e, a microcomputer 27 for controlling the driving circuits 26a to 26e, an A / D converter 28 and a multiplexer (MPX) 29 for inputting signals to the microcomputer 27, and a display unit 4 of an operation panel 35 described later.
The microcomputer 27 includes a central processing unit (CPU), a ROM, a RAM, and the like. The multiplexer (MPX) 29 receives a signal from the outside air temperature sensor 31 that detects the outside air temperature, a signal from the vehicle interior temperature sensor 32 that detects the vehicle interior temperature, a signal from the solar radiation sensor 33 that detects the amount of solar radiation, and the like. Is entered.

Further, the microcomputer 27 is adapted to receive a signal or the like from the operation panel 35 which outputs a control command in response to an operation of an occupant. This operation panel 35 manually sets an AUTO switch 36 for outputting a command for automatically controlling each air conditioner such as various doors, electromagnetic clutches, and blowers, and an intake mode to an internal air circulation mode (REC) or an external air introduction mode (FRESH). REC
A switch 37, an A / C switch 38 for individually instructing the operation of the cooling cycle, an OFF switch 39 for outputting an instruction for controlling the OFF mode of each air conditioner, and a DEF switch 4 for forcibly setting the blowout mode to the defrost mode.
0, up and down switches 42a and 42b of the temperature setter 41 for setting the target temperature in the vehicle compartment, a FAN switch 43 for switching the blowing capacity, and a MODE switch 44 for manually setting the blowout mode, and an up and down switch 42a, 42b, the target temperature set by 42b, the blowing capacity set by the FAN switch 43, and the MODE switch 44
The blowout mode set in step 1 is displayed on the display unit 45 provided on the panel surface.

FIG. 2 is a flow chart showing an example of total signal calculation processing by the microcomputer 27. This arithmetic processing example shows one of the modes for surely changing the air conditioning capacity by operating the operation panel 35 when the air conditioning capacity is fixed at the maximum or minimum state. Since the heating capacity is maximized even when the temperature control is stable, it is difficult to change the air conditioning capacity even if the set temperature is operated. The temperature control ability is changed accordingly.

This will be described below. The microcomputer 27 includes the outside air temperature sensor 31 and the vehicle interior temperature sensor 3
2. After inputting various signals necessary for air conditioning control such as the solar radiation sensor 33 and the operation panel 35, in step 50,
After the ignition switch (IG), which is off, is turned on, this step is started and it is determined whether or not to pass. Step 5 if this is the first pass
If it is the second time or later, the process proceeds to step 58.

In step 52, the battery (B
After the ATT) is disconnected (OFF) and connected (ON) to the electric system, this step is started to determine whether or not to pass. If the ignition switch is turned on for the first time after the battery is connected and the routine shown in FIG. 2 is passed for the first time, it is necessary to initialize the correction amount α and the flag (FLAG) which will be described later.
Then, α = 0 and FLAG = 0 are set, and the routine proceeds to step 58. When the battery is already connected and the ignition switch is turned on again, if the routine shown in FIG. 2 is passed for the first time, the routine proceeds to step 56, where the correction amount α stored in step 70 described later is stored.
Of the stored value α m and the outside air temperature Tam when the correction amount α is set in step 70 and the current outside air temperature Ta (Tam
Based on −Ta), the corrected correction amount α is calculated by the equation 1, and then the process proceeds to step 58.

[0026]

## EQU1 ## α = αm + B (Tam-Ta)

In step 58, the vehicle interior temperature T
Based on r, the outside air temperature Ta, the amount of solar radiation Ts, and the set temperature Tset, the control signal corresponding to the heat load is calculated as the total signal T of Formula 2. The set temperature Tset is set to 25 ° C. at the initial operation of the air conditioner, that is, when the artificial temperature setting operation has never been performed after the ignition switch is turned on. Further, B, C, D and E are arithmetic constants, and α is a correction amount described later.

[0028]

[Formula 2] T = (Tr-25) + B (Ta-25) + C ·
Ts-D (Tset-25) + E + α

Then, in the next step 60, a flag (FLAG) for identifying the presence or absence of correction of the total signal.
Is set to "1". here,
When the flag (FLAG) is "0", it indicates that the total signal is not corrected, and when it is "1", it indicates that the total signal is corrected.

When it is determined in step 60 that the flag is not "1", the process proceeds to step 62, in which the vehicle interior temperature sensor recognizes whether or not the air conditioning condition in the vehicle interior has reached a stable state. It is determined whether or not the indoor temperature (Tr) has become higher than the target vehicle interior temperature (target Tr). The recognition that the stable state has been reached may be determined by the rate of change of the temperature inside the vehicle being equal to or less than a predetermined value. By this step 62, it is determined whether the air conditioning control of the air-conditioned space is in the stable state. A third determination means for determining whether or not is configured.

By the way, the air-conditioning capacity is changed by the air-blowing capacity, the opening adjustment of the air-mix door 16 and the like. The air-blowing capacity has a predetermined characteristic based on the total signal T, for example, the characteristic shown in FIG. The operation amount of the blower 7 shown, that is,
It is determined by the blower voltage (V) applied to the motor 7a of the blower. This characteristic is known per se, and in the intermediate region (T3 to T4) of the total signal T, the voltage becomes V _LOW that realizes low air blowing capacity, and the total signal T becomes T1.
In a smaller area, the voltage V _HI realizes a high air blowing capacity, and in an area where the total signal T is larger than T2, the voltage V _HI or V _MAX realizes a high air blowing capacity or a maximum air blowing capacity. The blower voltage continuously changes from V _HI to V _LOW with an increase, and the blower voltage continuously changes from V _LOW to V _HI with an increase in T in the section from T4 to T2. . Further, the opening degree (%) of the air mix door 16 is determined based on the comprehensive signal T so as to have the characteristic of FIG. This characteristic is also known per se, and the total signal T
In a region of a predetermined value T5 or less, the opening is 100% full hot, and in a region of a predetermined value T6 or more, the opening is 0% full cool, and in the meantime, from full hot to full cool. It has continuous characteristics. Hereinafter, for the sake of convenience, the case where the air conditioner as the control target is a blower and the air conditioning capacity is adjusted in relation to the operation amount of the blower will be described.

In extremely cold weather, since the outside air temperature Ta is very low, the total signal T is very small, and the blowing capacity is MAX even in a stable state (in this state, the air mix door 16 is also in a full heat state (opening 100). %) And)). In principle, even if the set temperature is changed to 25 ° C or higher in such a state, the heating capacity cannot be further increased, but if the temperature is set to 25 ° C or lower, the blowing capacity is lowered. In principle, it should be possible to reduce the heating capacity by doing the same. Therefore, when it is determined that the vehicle interior has reached a stable state, the routine proceeds to step 64, where the up and down switches 42a and 42b of the temperature setting device 41 are operated to set the temperature inside the vehicle interior from 25 ° C to 25 ° C. It is determined whether or not the operation is performed below C. If the set temperature Tset is changed, the total signal T in step 58 is changed.
This step 64 corresponds to the second judging means for judging whether or not the total signal is artificially changed.

However, in spite of the change of the set temperature to less than 25 ° C., when the above-mentioned high heating capacity is used, the total signal T cannot be changed so much that the operation amount of the air conditioner is changed by a slight change. . Therefore, in order to be able to change the air conditioning capacity by operating the set temperature even in such a state, it is necessary to forcefully shift the total signal. Therefore, first, if it is determined that the set temperature has been changed to less than 25 ° C,
Proceeding to step 66, the total signal at 25 ° C. is calculated. The calculation of the total signal at 25 ° C. may be calculated based on Formula 3 based on the vehicle interior temperature Tr, the outside air temperature Ta, and the solar radiation amount Ts at the time when the set temperature is operated to 25 ° C. or less.

[0034]

[Equation 3] T25 = (Tr-25) + B (Ta-25) + C
・ Ts + E

Then, in step 68, the total signal T1 at the change point where the manipulated variable (blower voltage V) changes from V _HI is compared with the total signal T25 calculated in step 66. In this embodiment, the change point of the operation amount of the blower 7 is described, but instead of this,
When the operation amount of the air mix door of FIG. 3B is used, the total signal T5 at the change point where the heating capacity changes from the maximum state may be compared with T25.

In the extremely cold weather, as described above, T25 becomes smaller than T1 even if the vehicle interior temperature control becomes stable. As is clear from FIG. 3, in the region of T1 and below, the air conditioner (blower) The manipulated _{variable of} is constant at V _HI . From this, the process of step 68 can be used as the first determining means for determining whether or not the air conditioning capacity is fixed.

If it is determined that the air conditioning capacity is fixed, the routine proceeds to step 70, where the correction amount α of the total signal is set to | T25-T1 |. Further, in this step, the flag (FLAG) is set to "1", and the correction amount α and the outside air temperature Tamb at this point are αm = α and Tam = Ta.
Memorize as.

On the other hand, if it is determined in step 60 that the flag is "1", the process proceeds to step 72, and it is determined whether the set temperature has been changed from less than 25 ° C to 25 ° C or more. To determine. In this step,
As long as the set temperature is set to less than 25 ° C, the correction amount α of the total signal T is maintained at | T25-T1 |
If the setting is changed to C or more, the process proceeds to step 74, the flag is set to "0" and the correction amount α is changed to 0.

In the above process, first, in the initial stage of turning on the ignition switch (IG) and in the initial stage of connection of the battery (BATT), the correction amount α is set to 0 in step 54, and the α In step 58, the total signal T is calculated, and thereafter, the operation amount of the blower 7 is determined by the total signal in which the correction amount α is 0 while the temperature control in the vehicle interior is not stable. After that, the temperature control in the passenger compartment is stable and the set temperature is 25 ° C.
To less than 25 ° C, step 66
At, T25 is calculated. In the extremely cold season when the outside air temperature Ta is extremely low, T25 is much lower than T1. In this case, the correction amount α of the total signal is calculated in step 70, and when the process of step 58 is performed again. The total signal T is corrected by the calculated α.

Once T is corrected, the flag is set to "1" in step 70, so step 60
From step 72 to step 72, the manipulated variable is determined based on the corrected total signal unless the set temperature is set to 25 ° C or higher.

Then, the set temperature is changed from 25 ° C or lower to 25
When the setting is changed to ° C or more, the correction amount is set to zero in step 74, and unless the set temperature is changed to less than 25 ° C, the air conditioning is controlled by the uncorrected general signal.

That is, as shown in FIG. 4 (a), unless the set temperature is artificially changed, T is considerably smaller than T1 in the initial stage because the outside air temperature is low (a position corresponding to, for example, ), If the set temperature is changed to 25 ° C or lower in this state, T first shifts to T1 (the position corresponding to), and the total signal changes from this shifted state according to the change of the set temperature ( The amount of change ΔT) is applied (the position corresponding to). For this reason, the blower voltage V becomes small, the air blowing capacity is changed by an amount corresponding to the change amount (ΔV) of the voltage, and the air conditioning capacity can be lowered. Then, if there is a request to change the set temperature to 25 ° C. or higher, the total signal T becomes smaller by α = | T25−T1 | corrected by T1 + ΔT, and the position (maximum air blowing capacity) is requested again. Return to the position corresponding to.

In the above, the control in the extremely cold weather has been described. However, even in the extremely warm time, the processing of the flowchart shown in FIG. I'll do it. Hereinafter, the different points will be mainly described.

In this control, in steps 80 to 86, the same processing as the processing in steps 50 to 56 of the above-described embodiment is performed, and in step 88, the total signal T is calculated based on equation (4). Since the direction in which the total signal T is desired to be corrected during extremely warm is the direction in which the total signal becomes smaller, in Expression 4, the sign before α is negative.

[0045]

[Equation 4] T = (Tr-25) + B (Ta-25) + C ·
Ts-D (Tset-25) + E-α

Then, after the presence or absence of the correction is determined by the flag as in the above-described embodiment (step 90), in step 92, the vehicle interior temperature Tr is set as to whether or not the air conditioning state in the vehicle interior has reached a substantially stable state. Vehicle temperature (target T
It is determined by whether it is smaller than r). Similarly, also here, the recognition that the stable state has been reached may be performed by the rate of change of the temperature inside the vehicle being equal to or less than a predetermined value.

If it is determined that the passenger compartment has reached a stable state, the routine proceeds to step 94, where the set temperature in the passenger compartment is set to 25.
It is determined whether the temperature is increased from ° C to more than 25 ° C. At extremely warm temperatures, the total signal T becomes extremely large,
Even in a stable state, the blowing capacity is MAX, and the air mix door is also in a fully cool state (opening 0%). In principle, even if the set temperature is changed to 25 ° C or lower in such a state, the cooling capacity cannot be further increased.
If it is set higher than ° C, it should be possible in principle to lower the cooling capacity by lowering the blowing capacity or decreasing the air mix door opening. Therefore, when it is determined that the vehicle interior has reached a stable state, the process proceeds to step 94, and the up / down switch 42
It is determined whether or not the set temperature in the vehicle compartment is increased from 25 ° C to more than 25 ° C by operating a and 42b.

However, even if the setting is changed to be larger than 25 ° C., at the time of the high cooling capacity described above, the total signal T cannot be changed so much that the operation amount is changed by a slight change. Therefore, in such a case, in order to change the air conditioning capacity by operating the set temperature, it is necessary to forcefully shift the total signal. Therefore, first, the set temperature is 25 ° C.
If it is determined that the value has been changed to a larger value, the routine proceeds to step 96, where the total signal T25 at 25 ° C. is calculated based on Equation 3.

Then, in step 98, the total signal T2 at the change point where the manipulated variable (blower voltage V) changes from V _MAX is compared with the total signal T25 obtained in step 96. Also in this embodiment, the operation amount of the blower is described, but when the operation amount of the air mix door of FIG. 4B is used instead, the change point at which the cooling capacity changes from the maximum state. The total signal T6 at T should be compared with T25.

At the time of extremely warm, T25 becomes larger than T2 even if the vehicle interior temperature control becomes stable as described above, and as is clear from FIG. 3, in the region of T2 and above, the air conditioner (blower The operation amount of) is constant at VMAX. From this, it is possible to determine whether or not the air conditioning capacity is fixed by the processing of step 98.

When it is determined that the air conditioning capacity is fixed, the routine proceeds to step 100, where the total signal correction amount α is set to | T25-T2 |. Further, in this step, the flag (FLAG) is set to "1" and the correction amount α and the outside air temperature Tamb at this point are αm = α and Tam = T.
Store as a.

On the other hand, when it is determined in step 90 that the flag is "1", the process proceeds to step 102, where the set temperature is set to be higher than 25 ° C and the temperature is set to 25 ° C or lower. It is determined whether the setting has been changed to. In this step, the set temperature is 25 ° C
As long as it is determined that it is larger, the correction amount α of the total signal T is maintained at | T25−T2 |, but if it is determined that the temperature is changed to 25 ° C. or less, the process proceeds to step 104 and the flag is set to “0”. And the correction amount α is changed to 0.

In the above process, first, when the ignition switch (IG) is initially turned on and the battery (BATT) is initially connected, the correction amount α is set to 0 in step 84, and α In step 88, the total signal T is calculated, and thereafter, the operation amount of the blower is determined by the total signal in which the correction amount α is 0 while the temperature control in the vehicle interior is not stable. After that, when the temperature control in the passenger compartment is stable and the set temperature is changed from 25 ° C to more than 25 ° C, step 9 is performed.
In T6, T25 is calculated. In the extremely warm period when the outside air temperature Ta is extremely high, T25 is much higher than T2. In this case, the correction amount α of the total signal is calculated in step 100, and the process of step 88 is performed again. Then, the total signal T is corrected by the calculated α.

Once T is corrected, the flag is set to "1" in step 90, so step 90
To step 102, and thereafter set temperature is 25 ° C.
Unless otherwise changed below, the manipulated variable is determined based on the corrected total signal.

When the set temperature is changed from a state of higher than 25 ° C. to a temperature of 25 ° C. or lower, the correction amount is set to zero in step 104, and unless the set temperature is set higher than 25 ° C. The air conditioning is controlled by the total signal which is not corrected.

That is, as shown in FIG. 4 (b), unless the set temperature is artificially changed, T is initially in a position largely deviated from T2 because the outside air temperature is high (corresponding to, for example, Position) and if the set temperature is changed more than 25 ° C in this state, T
(The position corresponding to the position), and the total signal is changed (change amount ΔT) in accordance with the change of the set temperature. Therefore, the blower voltage V
Becomes smaller, the blowing capacity changes by an amount corresponding to the amount of change (ΔV) in the voltage, and the air conditioning capacity can be reduced. Then, if there is a request to change the set temperature to 25 ° C or less, the total signal T becomes larger by the amount α = | T25-T2 | corrected by T2-ΔT, and the position for requesting the maximum blowing capacity again. Return to (position corresponding to).

Next, another example of a mode for surely changing the air conditioning capacity by operating the operation panel when the air conditioning capacity is fixed at the maximum or minimum state will be described. In this example, if there is a request to change the air conditioning capacity during warm-up or cool-down that temporarily maximizes the air conditioning capacity in the early stages of air conditioning, such as in the winter or summer, respond to this request. When the total signal change width becomes small due to the change of the air conditioning capacity and the sensor failure, etc., and the air conditioning capacity that should originally change does not change, the area where the total signal changes is air-conditioned. The feature is that the air conditioning capacity is changed by shifting to the area where the capacity changes.

FIG. 6 shows an example of control processing relating to this, and the detailed description thereof will be given below.
2. After inputting various signals necessary for air conditioning control, such as the solar radiation sensor 33 and the operation panel 35, in step 110, the ignition switch (I
After G) is turned on, this step is started and it is determined whether or not the vehicle passes. When it is determined that the process of this step is the first time after the ignition switch is turned on, it is necessary to initialize a correction amount α and a flag (FLAG) described later, and therefore the process proceeds to step 112, where α = 0, F
LAG = 0 is set, and the routine proceeds to step 114. If the ignition switch has been turned on before the previous time, the process directly proceeds to step 114.

In step 114, the vehicle interior temperature T
Based on r, the outside air temperature Ta, the amount of solar radiation Ts, and the set temperature Tset, a control signal that changes according to the heat load is calculated as the total signal T of the mathematical expression 2.

Then, in the next step 116, a flag (FLA for identifying the presence or absence of correction of the total signal is detected.
It is determined whether G) is set to "1". Here, if the flag (FLAG) is "0", it indicates that the total signal is not corrected, and if it is "1", it indicates that the total signal is corrected.

When it is judged at step 116 that the flag is not "1", the routine proceeds to step 118, where whether the time measured by the timer (Time) has passed a predetermined time (t0) since the ignition switch was turned on. Determine whether or not.

When it is judged in Step 118 that Time> t0, the routine proceeds to Step 120, where it is judged whether or not the set temperature in the vehicle compartment is set from 25 ° C to less than 25 ° C, and this Step 120 When it is determined that the set temperature is set to less than 25 ° C in step 122, the process proceeds to step 122, and the total signal T25 at 25 ° C is calculated. This 2
Computation of the total signal at 5 ° C is performed at 25 ° C
The temperature may be calculated based on the equation 3 according to the temperature inside the vehicle, the temperature of the outside air, and the amount of solar radiation at the time of operating below.

Thereafter, in step 124, as in the case of step 68, for example, the total signal T1 at the changing point where the operation amount of the blower changes and the total signal T25 calculated in step 122 are compared. Here, for example, the operation amount of the air conditioner for changing the air conditioning capacity is the air mix door 1
Assuming that the opening is 6, the above T1 is changed to a total signal at the change point (T5) of the air mix door opening.

If it is determined that T25 <T1, the routine proceeds to step 126, where sensors such as the outside air temperature sensor 31, the passenger compartment temperature sensor 32, and the solar radiation sensor 33 which detect the calculation factor of the total signal, That is, it is determined whether or not the sensor that detects the environmental condition that affects the overall signal has failed. This failure determination is required when the air conditioning capacity is fixed during warm-up when the vehicle interior is rapidly approaching the target temperature, or when a sensor failure causes the overall signal to broaden according to environmental changes. This is because it does not change, and as a result, it is determined whether the air conditioning capacity is fixed.

If it is determined that the sensor is out of order, the process proceeds to step 128, where the air conditioning panel 35
Alternatively, the failure is displayed by using a display device specially provided for displaying the failure, and the process proceeds to step 130. If it is determined that there is no malfunction, the process proceeds to step 130 without displaying the malfunction. In step 130, the correction amount α of the total signal is calculated as | T25−T1 | so that the total signal T25 at 25 ° C. comes to the position T1 corresponding to the change point of the operation amount.

By the way, if it is determined in step 116 that the flag is "1", step 132
Then, it proceeds to and determines whether or not the set temperature is changed from less than 25 ° C to 25 ° C or more. In this step, unless it is determined that the set temperature has been changed to 25 ° C or higher, the correction amount α of the total signal T is maintained at | T25-T1 |, but it is determined that it has been changed to 25 ° C or higher. In step 134, the flag is set to "0", the correction amount α is changed to 0, and the total signal T which has been shifted by the correction amount is returned to the original state.

The above shows the case where there is a request for heating.
In the control when there is a cooling request, the process of the flowchart shown in FIG. 7 may be performed. Hereinafter, the different points will be mainly described.

In this control, steps 140 to 142 are executed.
In step (1), the same processing as the processing of steps 110 to 112 of the above-described embodiment is performed, and in step 144, the total signal is calculated based on the mathematical expression 4. Since the direction in which the total signal is desired to be corrected when the cooling is requested is the direction in which the total signal becomes smaller, the sign before α is negative.

After that, after the presence or absence of the correction is determined by the flag as in the above-described embodiment (step 146), it is determined whether or not a predetermined time has elapsed (step 148), and a predetermined time has elapsed after the ignition switch was turned on. When the time has elapsed, it is determined whether or not the set temperature is changed from 25 ° C to more than 25 ° C. When it is determined in step 150 that the set temperature has been changed from 25 ° C to more than 25 ° C, the process proceeds to step 152, and the total signal T25 at 25 ° C is calculated. The calculation of the total signal T25 at 25 ° C. may be carried out based on the equation 3 according to the vehicle interior temperature, the outside air temperature, and the amount of solar radiation at the time when the setting temperature is changed to be larger than 25 ° C.

Then, in step 154, for example, the total signal T2 at the changing point where the operation amount of the blower changes and the total signal T25 calculated in step 152 are compared. Here, for example, assuming that the operation amount of the air conditioner for changing the air conditioning capacity is the opening degree of the air mixing door, the above T2 is a change point of the opening degree of the air mixing door (T6
) Is changed to the total signal.

Then, in step 154, T25>
If it is determined to be T2, the routine proceeds to step 156, where it is determined whether or not the sensors such as the outside air temperature sensor 31, the inside air temperature sensor 32, and the solar radiation sensor 33 that detect the calculation factor of the total signal have failed. Judge for the same reason as above.

If it is determined in step 156 that the sensor is out of order, the process proceeds to step 158.
The failure is displayed using an air conditioning panel or a display specially provided for displaying the failure, and the process proceeds to step 160.
If it is determined that there is no failure, the failure is not displayed and the process proceeds to step 160. In step 160, the total signal correction amount α is set to | T so that the total signal T25 at 25 ° C. comes to the position T2 corresponding to the change point of the operation amount.
Calculate as 25-T2 |.

When it is determined in step 146 that the flag is "1", the process proceeds to step 162, and it is determined whether or not the set temperature has been changed from 25 ° C or higher to 25 ° C or lower. . In this step, unless it is determined that the set temperature has been changed to 25 ° C or lower,
The correction amount α of the total signal T is maintained at | T25-T2 |, but if it is determined that the temperature is changed to 25 ° C or lower,
The process proceeds to step 164, the flag is set to "0", the correction amount α is set to 0, and the total signal T which has been shifted so far is restored.

In the above-described integrated signal calculation process of FIGS. 6 and 7, first, in the initial stage of air conditioning when the ignition switch (IG) is turned on, steps 112 and 142 are set.
, Α = 0 and FLAG = 0 are set, and in that state, the total signal T is calculated in steps 114 and 144. That is, the total signal T = (Tr-25) where α = 0
+ B (Ta-25) + C · Ts-D (Tset-25) +
E is calculated. Thereafter, when it is determined in steps 118 and 148 that the predetermined time has elapsed, the set temperature is changed by the operation panel, and when it is determined that T25 is in the characteristic region in which the operation amount is fixed, the warm The air conditioning capacity is temporarily reduced to MA due to the request for up or cool down.
The air conditioning capacity is MAX because the total signal changes only in the range of the operation amount fixed area due to the sensor failure or the sensor failure, so in this case,
In steps 130 and 160, a correction amount α for shifting the total signal is calculated. Therefore, this correction amount α
If steps 114 and 144 are calculated with, the total signal T shifts to a value corresponding to the change point of the manipulated variable. Therefore, even if the set temperature is slightly changed, the manipulated variable can be changed as in the above-described embodiment. Will be able to.

Therefore, if the occupant has an intention to change the air conditioning capacity by operating the temperature setting device when the air conditioning capacity happens to be fixed due to a transition period before the air conditioning state stabilizes or a sensor failure, the Such intentions can be reflected as much as possible. Further, according to the embodiment corresponding to FIGS. 6 and 7, when the air conditioning capacity happens to be fixed due to a sensor failure, the control signal is restored by shifting the change area of the total signal to the change area of the operation amount. It also has the ability to do so.

[0076]

As described above, in any of the inventions, when the air conditioning capacity is fixed and there is a request for changing the air conditioning capacity, the total signal is shifted to the point where the operation amount of the air conditioning equipment can be changed. This is common in that the air conditioning capacity is changed by the above, and the operability can be improved. That is, not only when the air conditioning capacity is greatly changed, but also when it is desired to slightly change the air conditioning capacity, a reliable change can be obtained, and the air conditioning capacity can be finely adjusted.

In particular, according to the second aspect of the invention, even if the air conditioning capacity is fixed in a stable state, the total signal corresponds to the change point of the manipulated variable characteristic by artificially changing the set temperature. Since it is corrected to the value that is set, the air conditioning capacity can be surely changed in response to the temperature change request of the occupant.

Further, according to the third aspect of the present invention, even when the air conditioning capacity is fixed due to a failure in the transient period until reaching a stable state or in the detector for detecting the calculation factor of the total signal, the occupant is fixed. It is possible to reliably change the air conditioning capacity in response to the temperature control change request.

Further, according to the invention of claim 4, it is possible to determine whether the air-conditioning capacity is fixed due to a detector failure or another factor.
You can know exactly whether maintenance is required.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a vehicle air conditioner in which an air conditioning control device according to the present invention is used.

FIG. 2 is a flowchart showing an example of control processing by the microcomputer of FIG. 1, particularly showing an example of total signal calculation processing in extremely cold weather.

FIG. 3A is a diagram showing a characteristic of a blower voltage, which is an operation amount of a blower, with respect to a total signal, and FIG.
(B) shows the diagram which shows the characteristic with respect to the integrated signal of the air mix door opening.

FIG. 4 (a) is an enlarged view of a part of FIG. 3 (a) for explaining the change of the blower voltage when the total signal is small, and FIG. It is a figure which expanded a part of FIG.3 (a) explaining the change of a blower voltage at the time of being large.

FIG. 5 is a flow chart showing an example of control processing by a microcomputer, particularly showing an example of total signal calculation processing in extremely warm time.

FIG. 6 is a flowchart showing another example of total signal calculation processing by a microcomputer.

FIG. 7 is a flowchart showing still another example of total signal calculation processing by the microcomputer.

[Explanation of symbols]

 7 Blower 16 Air mix door 21 Vehicle compartment 27 Microcomputer 31 Outside air temperature detection sensor 32 Inside air temperature detection sensor 33 Solar radiation sensor 41 Temperature setting device

Claims (4)

[Claims] Claim: What is claimed is: 1. An air conditioning control device for automatically controlling an air conditioner involved in air conditioning of an air-conditioned space to obtain a predetermined manipulated variable characteristic by a comprehensive signal calculated based on various factors related to heat load. First determining means for determining that the total signal has been changed, and second determining for determining whether or not the total signal has been artificially changed.
If the air conditioning capacity is fixed by the determining means and the first determining means, and the overall signal is artificially changed by the second determining means, the total signal is changed to the predetermined operation. An air-conditioning control device, comprising: a correction unit that corrects a total signal corresponding to a change point of the quantity characteristic. 2. An air conditioning control device for automatically controlling an air conditioner engaged in air conditioning of an air-conditioned space so as to obtain a predetermined operation amount characteristic by a total signal calculated based on various factors related to heat load, based on the total signal. First determining means for determining that the operation amount of the air conditioning equipment obtained as a result is in the invariable region of the operation amount characteristic, and changing the set temperature of the air-conditioned space which is one of the calculation factors of the comprehensive signal A second determining means for determining that the air-conditioned space is in a stable state, a third determining means for determining whether or not the air conditioning control of the air-conditioned space is in a stable state, and an operation amount of the air conditioner by the first determining means. Is determined to be in the invariable region, the second determining means determines that the set temperature has been changed, and the third determining means determines that the air conditioning control is in a stable state. When you change Of the total signal and the total signal corresponding to the change point of the predetermined operation amount characteristic are used as a correction amount, and the total signal is corrected to be a total signal corresponding to the change point. Air conditioning control device. 3. An air conditioning controller for automatically controlling an air conditioner involved in air conditioning of an air-conditioned space to obtain a predetermined manipulated variable characteristic by a total signal calculated based on various factors related to heat load, within a predetermined time. First determining means for determining that the operation amount of the air conditioner obtained based on the total signal is in the invariant region of the operation amount characteristic, and at least one calculation factor of the total signal is artificially changed. It is determined that the operation amount of the air conditioner is in the invariable region by the second determination unit that determines that the calculation factor is artificially changed by the second determination unit. If determined, the difference between the total signal at the time when the calculation factor is changed and the total signal corresponding to the change point of the predetermined manipulated variable characteristic is used as a correction amount, and the total signal corresponds to the change point. Belief And a correcting means for correcting so that the air-conditioning control device has the same number. 4. The air-conditioning control device according to claim 3, further comprising a determination unit that determines whether or not a detector that detects an environmental condition affecting the overall signal is defective.