JP2008068794A - Vehicular air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adequately enhance the air-conditioning feeling of a vehicular air-conditioner controlling the operation of a room temperature adjustment means based on the deviation between the room temperature and the set temperature. <P>SOLUTION: When the deviation En between the room temperature Tr and the set temperature Tset is not less than the preset first reference value Es1, and the deviation En is not higher than the preset third reference value Es3, the control constant T for correcting the integrated value for performing the proportional integration control of the room temperature adjustment means is extended to the reference control constant Ts. When the deviation between the room temperature Tr and the set temperature Tset is increased, the degree of the room temperature adjustment by the room temperature adjustment means can be extended, and the air-conditioning feeling can be adequately enhanced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner.

Conventionally, Patent Literature 1 discloses a vehicle air conditioner that changes a control constant of an air conditioning control device in accordance with a deviation between an actual indoor temperature and a target temperature (set temperature) in a passenger compartment set by an occupant. . In the vehicle air conditioner disclosed in Patent Document 1, for example, the control constant for controlling the room temperature adjusting means is changed at the time of cool-down for rapidly lowering the passenger compartment temperature and warm-up for rapidly raising the passenger compartment temperature. The air conditioning feeling is improved.
JP 61-163012 A

  However, in Patent Document 1, for example, by changing a control constant for controlling the operation of an air mix door, which is one of room temperature adjusting means, to an appropriate value, the control characteristics at the time of cool-down and warm-up are changed. It only describes that it can be optimized, and does not disclose the specific contents on how to change the control constant (see the third page of Patent Document 1 and the lower right paragraph).

  In view of the above points, an object of the present invention is to appropriately improve the air conditioning feeling of a vehicle air conditioner that controls the operation of a room temperature adjusting means based on the room temperature, the set temperature, and the deviation.

  In order to achieve the above object, in the present invention, a temperature detecting means (32) for detecting an actual indoor temperature, a temperature setting means (36) for setting a target indoor temperature, and a room temperature for adjusting the indoor temperature. The adjustment means (8, 17), the room temperature control means (S6) for controlling the operation of the room temperature adjustment means (8, 17) by the calculation including the integral element, and the control constant used for correcting the integral value (SEn) in the calculation. Control constant determining means (S5) for determining (T), and the control constant determining means (S5) is set by the temperature setting means (36) from the room temperature (Tr) detected by the temperature detecting means (32). When the absolute value of the deviation (En) obtained by subtracting the set temperature (Tset) is equal to or greater than a predetermined reference value, the control constant (T) is changed with respect to the predetermined reference control constant (Ts). Become Wherein the vehicle air conditioner.

  According to this, when the absolute value of the deviation (En) exceeds a predetermined reference value, the control constant (T) is changed with respect to the predetermined reference control constant (Ts). When the difference between the room temperature (Tr) and the set temperature (Tset) becomes large, the degree of adjustment of the room temperature by the room temperature adjusting means (8, 17) by correcting the integral value (SEn) in the calculation including the integral element. Can be changed.

  That is, for example, when the deviation (En) is equal to or greater than a predetermined reference value, the degree of decrease in room temperature by the room temperature adjusting means (8, 17) can be increased. Furthermore, when the deviation (En) becomes equal to or less than a predetermined reference value, the degree of increase in the room temperature by the room temperature adjusting means (8, 17) can be increased. As a result, the air conditioning feeling can be improved appropriately.

  In the vehicle air conditioner having the above characteristics, the room temperature control means (S6) may correct the integral value (SEn) by multiplying the integral value (SEn) by the control constant (T). . According to this, since the integral value (SEn) can be easily changed by changing the control constant (T), the air conditioning feeling can be easily improved.

  Moreover, in the vehicle air conditioner having the above-described characteristics, for example, a blower may be employed as the room temperature adjusting means (8) to adjust the amount of air blown into the room. Further, as the room temperature adjusting means (17), for example, an air mix door may be employed to adjust the temperature of the air blown into the room.

  Further, in the vehicle air conditioner having the above-described characteristics, the control constant determining means (S5) specifically, the deviation (En) after the deviation (En) becomes equal to or greater than a predetermined first reference value (Es1). The control constant (T) may be determined to be larger than the reference control constant (Ts) until the value becomes equal to or less than a predetermined second reference value (Es2).

  According to this, when the deviation (En) becomes equal to or larger than the first reference value (Es1), for example, at the time of cool down in which rapid cooling of the room is required, the room temperature adjusting means (8, 17). It is possible to increase the degree of decrease in indoor temperature due to.

  Further, when the deviation (En) becomes equal to or less than the second reference value (Es2), the increased decrease degree can be returned to the reference decrease degree based on the reference control constant (Ts). As a result, the degree of decrease in room temperature can be increased as necessary, and the air conditioning feeling can be further improved appropriately.

  Further, in the vehicle air conditioner having the above-described characteristics, the control constant determining means (S5) specifically, the deviation (En) after the deviation (En) becomes equal to or smaller than a predetermined third reference value (Es3). The control constant (T) may be determined to be larger than the reference control constant (Ts) until the value becomes equal to or greater than a predetermined fourth reference value (Es4).

  According to this, when the deviation (En) becomes equal to or larger than the third reference value (Es3), for example, at the time of warm-up where rapid heating of the room is required, the room temperature adjusting means (8, 17) It is possible to increase the degree of increase in the room temperature due to.

  Furthermore, when the deviation (En) becomes equal to or greater than the fourth reference value (Es4), the increased degree of increase can be returned to the standard degree of increase based on the reference control constant (Ts). As a result, the degree of increase in the room temperature can be increased as necessary, and the air conditioning feeling can be further improved appropriately.

  In the vehicle air conditioner having the above-described features, the control constant determining means (S5) calculates the difference between the control constant (T) and the reference control constant (Ts) as the absolute value of the deviation (En) decreases. It may be reduced. According to this, as the absolute value of the deviation (En) is reduced, the degree of adjustment of the room temperature by the room temperature adjusting means (8, 17) can be reduced, so that the operation of the room temperature adjusting means (8, 17) is suddenly changed. Can be suppressed.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an overall configuration diagram of a vehicle air conditioner according to the present embodiment. This vehicle air conditioner is applied to a construction machine (construction machine) vehicle such as a hydraulic excavator.

  First, the vehicle air conditioner of the present embodiment includes an air conditioning unit 1 disposed on a lower rear portion of a seat (not shown) on which a passenger is seated, that is, on a floor behind the seat. The air conditioning unit 1 includes a resin-made case (for example, polypropylene) case 2 that forms an outer shell, and an air passage through which air flows toward the vehicle interior is formed inside the case 2.

  An inside / outside air switching box 5 is arranged in the most upstream part of the air flow in the air passage of the case 2. The inside / outside air switching box 5 has an inside air introduction port 3 for introducing inside air (vehicle compartment air) and an outside air introduction port 4 for introducing outside air (vehicle compartment outside air). An air switching door 6 is rotatably arranged.

  The inside / outside air switching door 6 is driven by a servo motor 7. The inside air mode for introducing inside air from the inside air introduction port 3, the outside air mode for introducing outside air from the outside air introduction port 4, and the inside air and the outside air simultaneously. This switches between the inside / outside air mode to be introduced. The servo motor 7 is driven and controlled by a control signal from an air conditioning control device 30 described later.

  On the downstream side of the inside / outside air switching box 5, a blower 8 that blows air toward the passenger compartment is disposed. In the present embodiment, as the blower 8, an electric blower that rotationally drives a centrifugal blower fan 8a by an electric motor 8b is employed.

  The rotational speed of the electric motor 8b is controlled by a control voltage output from the air conditioning control device 30 described later, and the amount of blown air blown toward the vehicle interior is adjusted by the rotational speed control. Therefore, the blower 8 constitutes a room temperature adjusting means for adjusting the temperature in the passenger compartment.

  An evaporator 9 serving as a cooling heat exchanger for cooling the blown air is disposed on the downstream side of the blower 8. The evaporator 9 is one of the elements constituting the refrigeration cycle 10, and the low-pressure refrigerant that has flowed into the evaporator 9 absorbs heat from the blown air blown by the blower 8 and evaporates, thereby blowing the blown air. It is designed to cool.

  Here, the refrigeration cycle 10 will be described. The refrigeration cycle 10 includes an evaporator 9, a compressor 11, a condenser 12, a gas-liquid separator 13, an expansion valve 14, and the like.

  First, the compressor 11 sucks, compresses, and discharges the refrigerant in the refrigeration cycle 10, and in this embodiment, a known fixed capacity compressor is employed. A driving force is transmitted to the compressor 11 from the vehicle travel engine E via the electromagnetic clutch 11a and the belt V.

  Moreover, this compressor 11 adjusts refrigerant | coolant discharge capability by intermittently supplying with electricity to the electromagnetic clutch 11a. Specifically, by controlling the energization of the electromagnetic clutch 11a, the ratio of the operation time and the non-operation time of the compressor 11 (operation rate) is changed, and the refrigerant discharge capacity of the compressor 11 is adjusted. Yes.

  The electromagnetic clutch 11a is intermittently controlled by a control voltage output from an air conditioning control device 30 described later.

  A condenser 12 is connected to the refrigerant discharge port of the compressor 11. The condenser 12 is a radiator that cools the refrigerant by exchanging heat between the refrigerant discharged from the compressor 11 and the outside air blown by the blower fan 12a. The blower fan 12a is rotationally driven by an electric motor 12b, and the electric motor 12b is rotationally controlled by a control voltage output from an air conditioning controller 30 described later.

  The refrigerant that has flowed out of the condenser 12 flows into a gas-liquid separator 13 (receiver) that separates the refrigerant into a gas-phase refrigerant and a liquid-phase refrigerant and stores excess refrigerant. An expansion valve 14 is connected to the liquid-phase refrigerant outlet side of the gas-liquid separator 13.

  The expansion valve 14 decompresses and expands the liquid-phase refrigerant separated by the gas-liquid separator 13, and in this embodiment, the throttle valve opening degree is set so that the degree of superheat of the refrigerant sucked into the compressor 11 becomes a predetermined value. A temperature-type expansion valve that controls the temperature is used.

  The refrigerant expanded under reduced pressure flows into the evaporator 9 and evaporates, and then flows into the compressor 11 again. Thus, in this embodiment, a refrigeration cycle in which the refrigerant circulates in the order of the compressor 11 → the condenser 12 → the gas-liquid separator 13 → the expansion valve 14 → the evaporator 9 → the compressor 11 is configured.

  On the other hand, in the indoor air conditioning unit 1, a heater core 15 that heats the air flowing in the case 2 is disposed on the downstream side of the evaporator 9. The heater core 15 is a heating heat exchanger that reheats the air (cold air) that has passed through the evaporator 9 by using cooling water that cools the vehicle traveling engine E as a heat source. For convenience of illustration, the engine coolant circuit is not shown in FIG.

  A cold air bypass passage 16 is formed on the side of the heater core 15. The cold air bypass passage 16 forms a cold air passage through which the cold air after passing through the evaporator 9 flows around the heater core 15.

  Further, an air mix door 17 is rotatably disposed between the evaporator 9 and the heater core 15. The air mix door 17 is driven by a servo motor 18 so that its rotational position (opening) can be continuously adjusted. The servo motor 18 is driven and controlled by a control signal from an air conditioning control device 30 described later.

  The ratio of the amount of air passing through the heater core 15 (warm air amount) and the amount of air passing through the bypass passage 16 and bypassing the heater core 15 (cold air amount) is adjusted by the opening of the air mix door 17. The temperature of the air blown into the passenger compartment is adjusted. Therefore, the air mix door 17 constitutes a room temperature adjusting means for adjusting the temperature in the room.

  At the most downstream part of the air passage of the case 2, a defroster outlet 19 for blowing conditioned air toward the front window glass of the vehicle, a face outlet 20 for blowing conditioned air toward the occupant's face, and A total of three types of air outlets 21 are provided, which are foot outlets 21 for blowing air-conditioned air toward the feet of passengers.

  A defroster door 22, a face door 23, and a foot door 24 are rotatably disposed upstream of the air outlets 19 to 21. These air outlet doors 22 to 24 are opened and closed by a common servomotor 25 via a link mechanism (not shown). The servo motor 25 is also driven and controlled by a control signal from the air conditioning controller 30.

  Next, the outline of the electric control unit according to the present embodiment will be described. The air conditioning control device 30 includes a known microcomputer including a CPU, a ROM, a RAM, and the like and peripheral circuits thereof. The air conditioning control device 30 stores a program for controlling the air conditioning device in the ROM, and performs various calculations and processes based on the program.

  A sensor detection signal is input from the air conditioning sensor group to the input side of the air conditioning control device 30, and various air conditioning operation switches 34 to 36 provided on the air conditioning operation panel 33 disposed in the vicinity of the instrument panel in the front part of the passenger compartment. An operation signal is input from.

  Specifically, the air-conditioning sensor group includes an evaporator temperature sensor 31 that is disposed in the air blowing portion of the evaporator 9 and detects the evaporator blowing air temperature Te, and a temperature detection means that detects the actual temperature in the passenger compartment. An internal air temperature sensor 32 or the like is provided.

  The air conditioning operation panel 33 includes various air conditioning operation switches, including an air conditioner switch 34 for outputting an operation command signal for the compressor 11, an auto switch 35 for issuing a command signal for an air conditioning automatic control state, and a temperature setting means for setting a vehicle interior target temperature. A temperature setting switch 36 and the like are provided.

  On the other hand, servo motors 7, 18, 25, electric motors 8 b, 12 b and the like are connected to the output side of the air conditioning control device 30, and the operation of these devices is controlled by the output signal of the air conditioning control device 30.

  Next, control processing executed by the air conditioning control device 30 in the present embodiment will be described based on the flowchart of FIG. This control routine starts when the auto switch 35 is turned on while an ignition switch of a vehicle travel engine (not shown) is turned on.

  First, in step S1, flags, timers, etc. are initialized. Specifically, the setting of the cool-down control described later is canceled, the setting of the warm-up control is canceled, the reference control constant Ts is set (specifically, Ts = 0.05), and the integral value SEn is initialized (specifically Specifically, SEn = 0) is performed.

  In the next step S2, an operation signal of the air conditioning operation panel 33 is read. Then, in the next step S3, a vehicle environmental state signal, that is, a detection signal detected by the air conditioning sensor group is read.

Next, in step S4, a deviation En between the vehicle interior temperature (inside air temperature) Tr, which is the detected temperature of the inside air temperature sensor 32, and the set temperature Tset set by the temperature setting switch 36 is calculated. Specifically, it is calculated by the following formula F1.
En = Tr−Tset (F1)
Next, a control constant T is determined in step S5. That is, this step S5 is a control constant determining means in the present embodiment. The control constant T is a value obtained by dividing the sampling period τ (10 seconds in this embodiment) by a predetermined integration constant, and the temperature adjustment degree by the room temperature adjusting means 8 and 17 is an appropriate adjustment degree. Thus, it is a constant for correcting an integral value SEn described later.

  The details of step S5 will be described with reference to the flowchart of FIG. First, in step S501, it is determined whether or not the deviation En is greater than or equal to a first reference value Es1 (Es1 = 5 in the present embodiment). In step S501, if En ≧ Es1, the process proceeds to step S502, and if En ≧ Es1, the process proceeds to step S503.

  If the deviation En is greater than or equal to the first reference value Es1 in step S501, it is assumed that the inside air temperature Tr is significantly higher than the set temperature Tset, and in step S502, rapid cooling of the vehicle interior is performed. The cool-down control to be performed is set, and the process proceeds to step S504.

In step S504, the control constant T is determined by the following mathematical formula F2, and the process proceeds to step S6.
T = Ts + 0.05 × (En−1) / 4 (F2)
Here, when the above-described cool-down control is set, the control constant T is determined to be larger than the reference control constant Ts.

  Specifically, as will be described later in steps S503 and S505, the deviation En is always greater than the second reference value Es2 during the setting of the cool-down control, so the control constant determined in step S504. T becomes a value larger than the reference control constant Ts. Furthermore, in Formula F2, the difference between the control constant T and the reference control constant Ts is also reduced as the absolute value of the deviation En is reduced.

  Next, in step S503, it is determined whether or not the deviation En is equal to or less than a second reference value Es2 (Es2 = 1 in the present embodiment). In step S503, if En ≦ Es2, the process proceeds to step S505, and if En ≦ Es2, the process proceeds to step S506.

  If the deviation En is equal to or smaller than the second reference value Es2 in step S503, it is assumed that the absolute value of the difference between the internal temperature Tr and the set temperature Tset has decreased, and the cool-down control is forced in step S505. And the process proceeds to step S507.

  On the other hand, if En ≦ Es2 is not satisfied in step S503, it is determined in step S506 whether cool-down control is set. If the cool-down control is set, the process proceeds to step S504, the control constant T is determined by the above-described mathematical formula F2, and the process proceeds to step S6.

  In step S506, if the cool-down control is not set, the process proceeds to step S513, the control constant T is determined as the reference control constant Ts, and the process proceeds to step S6.

  Next, in step S507, it is determined whether or not the deviation En is equal to or smaller than a third reference value Es3 (Es3 = −5 in the present embodiment). In step S507, if En ≦ Es3, the process proceeds to step S508, and if En ≦ Es3, the process proceeds to step S509.

  If the deviation En is equal to or smaller than the third reference value Es3 in step S507, it is assumed that the inside air temperature Tr is significantly lower than the set temperature Tset, and in step S508, the vehicle interior is rapidly heated. The warm-up control to be performed is set, and the process proceeds to step S510.

In step S510, the control constant T is determined by the following formula F3, and the process proceeds to step S6.
T = Ts + 0.05 × (En + 1) / − 4 (F3)
Here, when the warm-up control is set, the control constant T is determined to be a value larger than the reference control constant Ts.

  Specifically, as will be described later in steps S509 and S511, during the setting of the warm-up control, the deviation En is always smaller than the fourth reference value Es4. Therefore, the control constant determined in step S510. T becomes a value larger than the reference control constant Ts. Further, in Formula F3, as the absolute value of the deviation En is reduced, the difference between the control constant T and the reference control constant Ts is also reduced.

  Next, in step S509, it is determined whether or not the deviation En is equal to or greater than a fourth reference value Es4 (Es4 = −1 in the present embodiment). In step S509, if En ≧ Es4, the process proceeds to step S511, and if En ≧ Es4 is not satisfied, the process proceeds to step S512.

  If the deviation En is greater than or equal to the fourth reference value Es4 in step S509, it is assumed that the absolute value of the difference between the internal temperature Tr and the set temperature Tset has decreased, and the warm-up control is forced in step S511. And the process proceeds to step S513. In step S513, the control constant T is set as the reference control constant Ts, and the process proceeds to step S6.

  On the other hand, if En ≧ Es4 is not satisfied in step S509, it is determined in step S512 whether warm-up control is set. If the warm-up control is set, the process proceeds to step S510, the control constant T is determined by the above-described equation F3, and the process proceeds to step S6.

  If the warm-up control is not set in step S512, the process proceeds to step S513, the control constant T is determined as the reference control constant Ts, and the process proceeds to step S6.

  As described above, when the control constant T is determined, as shown in FIG. 2, the process proceeds to step S6, where the air conditioning control devices (room temperature adjusting means) 8, 17 are controlled. Here, the details of step S6 will be described with reference to the flowchart of FIG.

First, in step S601, the control value Y is calculated by the following formula F4. This control value Y is a value used when reading out an actual output signal for controlling the room temperature adjusting means 8 and 17 from the map.
Y = T × (SEn + En) + En (F4)
Here, SEn is an integrated value obtained by adding the deviation En every sampling period.

  Further, as shown in Formula F4, the control constant T plays a role as a constant used for correcting the integral value SEn. When the deviation En is large, the control value Y can be easily increased, and when the deviation En is small. It is easy to make the control value Y small.

  Next, in step S602, the amount of air blown by the blower 8 is determined. Specifically, it is determined based on the control value Y with reference to the control map shown in FIG. In the present embodiment, as shown in FIG. 5, the air flow rate is decreased in the region where the control value Y is 0 to −2, the air volume is increased as the control value Y increases from 0, and the control value Y is − The air volume is increased as it falls below 2.

  Next, in step S603, the opening degree of the air mix door is determined. Specifically, it is determined based on the control value Y with reference to the control map shown in FIG. In the present embodiment, as shown in FIG. 6, as the control value Y decreases, the amount of air passing through the heater core 15 from the maximum cooling side that maximizes the amount of air that bypasses the heater core 15 (cooling air amount) (temperature). It is gradually changed to the maximum heating side that maximizes the air volume.

  Next, in step S604, an output signal is output from the air conditioning control device 30 to the drive devices 8b and 18 of the room temperature adjusting means 8 and 17 so that the control state determined in steps S602 and S603 is obtained. .

Next, in step S605, as shown in the following formula F5, the deviation En is added to the integral value SEn (integral calculation).
SEn = SEn + En (F5)
Then, the process proceeds to step S7 in FIG.

  Therefore, step S6 controls the operation of the fan 8 and the air mix door 17, which are room temperature adjusting means, by an operation including the integral element shown in Formula F5 (more specifically, by proportional integral control (PI control)). The room temperature control means is configured.

  Next, in step S7 in FIG. 1, the process waits for the sampling period τ, and returns to step S2 when it is determined that the sampling period τ has elapsed.

  In the vehicle air conditioner of the present embodiment, since the above control is performed, the operations of the room temperature adjusting means 8 and 17 are controlled so that the absolute value of the deviation En between the internal temperature Tr and the set temperature Tset is reduced. . As a result, for example, the vehicle interior temperature (inside air temperature) Tr can be brought close to the set temperature Tset without providing a solar radiation sensor, an outside air temperature sensor, and the like, so that the cost of the vehicle air conditioner can be reduced.

  Furthermore, since the integral value SEn is corrected by multiplying the integral value SEn by the control constant T, the doors on which passengers get on and off are frequently opened and closed as in construction machinery vehicles, etc., and rapid cooling and heating in the passenger compartment is required. In a vehicle with a high frequency, air conditioning feeling can be improved appropriately and reliably.

  More specifically, since the control constant T is determined to be larger than the reference control constant Ts from when the deviation En becomes equal to or greater than the first reference value Es1 until it becomes equal to or less than the second reference value Es2, rapid change in the vehicle interior At the time of cool-down where cooling is required, the degree of decrease in room temperature by the room temperature adjusting means 8 and 17 can be increased.

  Further, the control constant T is determined to be larger than the reference control constant Ts until the deviation En becomes equal to or less than the fourth reference value Es4 after the deviation En becomes equal to or less than the third reference value Es3. During the warm-up, the degree of increase in the room temperature by the room temperature adjusting means 8 and 17 can be increased. As a result, the air conditioning feeling can be improved appropriately.

  Further, as shown in the mathematical expressions F2 and F3, the control constant T is determined so that the difference between the control constant T and the reference control constant Ts is reduced as the absolute value of the deviation En is reduced. It is also possible to suppress sudden fluctuations in the operation of 8 and 17.

  Here, the air conditioning feeling improvement effect by the vehicle air conditioner of the present embodiment will be specifically described with reference to FIG. The solid line in FIG. 7 shows the change over time of the internal temperature Tr at the time of cool-down by the vehicle air conditioner of the present embodiment, and the broken line shows the room temperature adjusting means 8 at the reference control constant Ts without changing the control constant T. , 17 shows a change with time of the internal temperature Tr at the time of cool-down by the vehicle air conditioner (hereinafter referred to as a comparative example air conditioner).

  As shown in FIG. 7, in the vehicle air conditioner of the present embodiment, the time required for cool down (cool down time) Tc1 is reduced with respect to the cool down time Tc2 of the comparative example air conditioner. This means that according to the vehicle air conditioner of the present embodiment, the vehicle interior can be rapidly cooled during the cool-down.

  In the vehicle air conditioner of the present embodiment, the overshoot amount Os1 at which the internal temperature Tr becomes lower than the set temperature Tset is larger than the overshoot amount Os2 of the comparative example air conditioner. In general, since the occupant's body temperature also rises during the cool-down period, such an appropriate increase in the amount of overshoot further improves the air conditioning feeling.

  In addition, in FIG. 7, although the air conditioning feeling improvement effect at the time of cool-down is shown, of course, the same effect can be acquired also at the time of warm-up.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be variously modified as follows.

  (1) In the above-described embodiment, an example in which the vehicle air conditioner of the present invention is applied to a construction machine vehicle has been described. However, the application of the vehicle air conditioner of the present invention is not limited to this. For example, the present invention may be applied to agricultural vehicles such as tractors, bus vehicles, and ordinary vehicles.

  (2) In the above-described embodiment, the overshoot amount is increased in order to improve the air conditioning feeling, but this overshoot amount is appropriately adjusted according to the vehicle to which the vehicle air conditioner is applied. be able to. Specifically, the overshoot amount may be adjusted by changing the coefficient of the deviation En in the above-described mathematical formulas F2 and F3.

  (3) In the above-described embodiment, the operation of the blower 8 and the air mix door 17 is controlled based on the control value Y in step S6. Further, the operation of the inside / outside air switching door 6 is controlled based on this control value Y. The operation of the blowout doors 22 to 24 may be controlled.

  (4) In the above-described embodiment, the description of the control of the compressor 11 is omitted, but the air conditioning control device 30 may control the operation of the compressor 11 in addition to the room temperature adjusting means 8 and 17. Good. Specifically, the air conditioning control device 30 may intermittently control the electromagnetic clutch 11a so that the evaporator blown air temperature Te falls within a predetermined temperature range.

  Furthermore, in the above-described embodiment, a fixed capacity type compressor is adopted, but a variable capacity type compressor may be adopted and the refrigerant discharge capacity may be adjusted by changing the discharge capacity. Further, the refrigerant discharge capacity may be adjusted by adopting an electric compressor and adjusting the rotation speed of the electric motor.

1 is an overall configuration diagram of a vehicle air conditioner according to an embodiment. It is a flowchart which shows control of the air-conditioning control apparatus of one Embodiment. It is a flowchart which shows the principal part of control of the air-conditioning control apparatus of one Embodiment. It is a flowchart which shows another principal part of control of the air-conditioning control apparatus of one Embodiment. It is a control characteristic figure for determining the blast volume of the air blower of one embodiment. It is a control characteristic figure for determining the opening of the air mix door of one embodiment. It is a graph which shows the change of internal temperature Tr by the vehicle air conditioner of one Embodiment.

Explanation of symbols

8 ... Blower, 17 ... Air mix door, 32 ... Inside air temperature sensor,
36 ... Temperature setting switch, S5 ... Control constant determining means, S6 ... Room temperature control means En ... Deviation, SEn ... Integral value, T ... Control constant, Ts ... Standard control constant,
Tr ... Inner temperature, Tset ... Set temperature, Es1 ... First reference value, Es2 ... Second reference value,
Es3: third reference value, Es4: fourth reference value.

Claims (7)

Temperature detection means (32) for detecting the actual temperature in the room;
Temperature setting means (36) for setting a target temperature in the room;
Room temperature adjusting means (8, 17) for adjusting the temperature in the room;
Room temperature control means (S6) for controlling the operation of the room temperature adjusting means (8, 17) by a calculation including an integral element;
Control constant determining means (S5) for determining a control constant (T) used for correcting the integral value (SEn) in the calculation,
The control constant determining means (S5) is a deviation (En) obtained by subtracting the set temperature (Tset) set by the temperature setting means (36) from the room temperature (Tr) detected by the temperature detecting means (32). When the absolute value of becomes greater than or equal to a predetermined reference value, the control constant (T) is changed with respect to a predetermined reference control constant (Ts). . The room temperature control means (S6) corrects the integral value (SEn) by multiplying the integral value (SEn) by the control constant (T). The vehicle air conditioner described. The vehicle air conditioner according to claim 1 or 2, wherein the room temperature adjusting means (8) adjusts the amount of air blown into the room. The vehicle air conditioner according to any one of claims 1 to 3, wherein the room temperature adjusting means (17) adjusts the temperature of air blown into the room. The control constant determining means (S5) reduces the deviation (En) to a predetermined second reference value (Es2) after the deviation (En) is equal to or higher than a predetermined first reference value (Es1). The vehicle air conditioning according to any one of claims 1 to 4, wherein the control constant (T) is determined to be larger than the reference control constant (Ts). apparatus. The control constant determining means (S5) determines that the deviation (En) is equal to or greater than a predetermined fourth reference value (Es4) after the deviation (En) is equal to or less than a predetermined third reference value (Es3). 6. The vehicle air conditioning according to claim 1, wherein the control constant (T) is determined to be larger than the reference control constant (Ts). apparatus. The control constant determining means (S5) reduces the difference between the control constant (T) and the reference control constant (Ts) as the absolute value of the deviation (En) decreases. The vehicle air conditioner according to any one of claims 1 to 6.

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