JPH0585143A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To obtain a blowoff temperature which satisfies the responsiveness and stability for a sudden change of a preset temperature of an air conditioner for a vehicle. CONSTITUTION:An air conditioner 100 for a vehicle is feedback-controlled according to output signals from the respective sensors by ECU 4, and the driving time and rotating direction of a servo motor 26 are decided. According to the conditions set for obtaining the responsiveness and the stability, a gain value for deciding the driving time is changed. That is, in the case of improving the responsiveness, the gain value is made larger than that in the normal control, and in the case of improving the stability, the gain value is made smaller than that in the normal control. Thus the blowoff temperature is changed in such a manner to be quick in the case of needing the responsiveness and be gentle in the case of needing the stability. Accordingly, air at such a radical blowoff temperature as to cause a feeling of physical disorder near the normal set temperature is kept from being blown off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner for automatically controlling a vehicle interior temperature to approach a control target temperature.

[0002]

2. Description of the Related Art Conventionally, a vehicle air conditioner has an inside air temperature sensor for detecting a temperature inside a vehicle, an outside air temperature sensor for detecting a disturbance factor,
A method of inputting signals from a solar radiation sensor, a water temperature sensor, an evaporator outlet temperature sensor, and an outlet temperature sensor provided at each outlet to an arithmetic circuit, and feedback-controlling the adjustment amount of an air mix damper, which is a temperature adjusting member, based on the signals. It has been known.

[0003]

In the blow-out temperature feedback control by the various sensors of the above-mentioned vehicle air conditioner, if the responsiveness based on the set temperature is increased, the blow-out temperature hunting occurs, and if the blow-out temperature hunting is eliminated. There was a problem of poor responsiveness.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a vehicular air-conditioning system having good responsiveness and stability of the outlet temperature with respect to a rapid change in the set temperature. Is to provide.

[0005]

The structure of the invention for solving the above problems is for a vehicle for controlling the adjustment amount of an adjusting member for changing the vehicle interior temperature based on the vehicle interior temperature, a control target temperature and a disturbance factor. In an air conditioner, a determination means for determining whether to prioritize the responsiveness to the outlet temperature or the stability based on the set temperature which is the parameter for determining the control target temperature and the amount of change thereof, and the determination result by the determination means When responsiveness is important, the predetermined gain value in the adjustment amount calculation of the adjusting member based on the vehicle interior temperature, the control target temperature and the disturbance factor is temporarily changed from the value in the normal control or the value in the normal control. In the case where stability is emphasized in the determination result by the first calculating means for increasing the internal temperature and the determination means, the vehicle interior temperature, the control target temperature, and the disturbance Wherein and wherein said predetermined gain value in the regulation amount calculation of the adjustment member further comprising a second calculating means for temporarily reduced from the value in the normal control based on.

[0006]

The discriminating means discriminates, based on the set temperature, which is a parameter for determining the control target temperature, and the amount of change thereof, which one of the responsiveness and the stability with respect to the blowout temperature is to be emphasized. When the determination result by the determination unit emphasizes the responsiveness by the first calculation unit, the predetermined gain value in the adjustment amount calculation of the adjustment member based on the vehicle interior temperature, the control target temperature and the disturbance factor is equal to that in the normal control. The value or the value in the normal control is temporarily increased. In this case, the fluctuation range of the blowout temperature becomes equal to or larger than that in the normal control, so that the responsiveness until reaching the control target temperature is accelerated. Further, when the determination result of the determining unit emphasizes stability by the second calculating unit, the predetermined gain value in the adjustment amount calculation of the adjusting member based on the vehicle interior temperature, the control target temperature and the disturbance factor is It is temporarily reduced from the value in normal control. In this case, since the fluctuation range of the blowout temperature is smaller than that in the normal control, hunting does not occur until the control target temperature is reached, and the stability is increased.

[0007]

EXAMPLES The present invention will be described below based on specific examples. FIG. 1 is a schematic configuration diagram showing a vehicle air conditioner 100 according to the present invention, and FIG. 2 is an enlarged perspective view showing a part of the air outlet switching unit 6 as seen through. Vehicle air conditioner 100
Blows the inside / outside air separated or mixed by the inside / outside air switching damper 7 by the blower 8 arranged in the inside / outside air switching unit 5 and rotated by the blower motor to the evaporator 2 arranged in the casing 1. This wind is cooled and dehumidified by the evaporator 2 and reaches the heater core 3 arranged in the outlet switching unit 6. Air mix dampers 16 and 18 are arranged adjacent to the inlet and outlet of the heater core 3.
The servomotor 26 drives the air mix dampers 16 and 18 connected by a link mechanism (not shown) to separate the air passing through the heater core 3 and the air bypassing. A target air temperature is created by mixing both winds downstream. Then, it is blown out from the defroster outlet 9, the vent outlet 10, the side vent outlet 11, the heat outlet 12 and the rear heat outlet 12a. Further, a mode switching damper (DEF) 13 for opening and closing the defroster outlet 9 by mode switching, a vent outlet 1
0 and the side vent outlet 11 are provided with a mode switching damper (VENT) 14, a heat outlet 12 and a rear heat outlet 12a with a mode switching damper (FOOT) 15 and the like. The adjusting members for changing the temperature inside the vehicle are the air mix dampers 16 and 18 and the servo motor 26.
Composed of etc.

The vehicle air conditioner 100 is provided with an electronic control unit (hereinafter referred to as ECU) 4. This E
The CU 4 has a set temperature T _set , an outside air temperature T _am , and an insolation amount T, which are output signals from the temperature setter 27 of the operation panel, the outside air temperature sensor 28, the insolation sensor 29, and the inside air temperature sensor 30.
_s and the inside air temperature T _r are input. Further, the ECU 4 includes an evaporator outlet temperature sensor 31 disposed downstream of the evaporator 2, a water temperature sensor 32 of the heater core 3, a VENT outlet temperature sensor 37 disposed upstream of the vent outlet 10, a heat outlet 12, and a rear heat outlet. Output signals from the FOOT outlet temperature sensor 38 disposed upstream of the 12a and the DEF outlet temperature sensor 39 disposed upstream of the defroster outlet 9 are input.

The vehicle air conditioner 100 is normally feedback-controlled based on the servo motor drive time SWh of the following equation (1). SWh = K _p {E _n −E _n-1 + (θ / T _i ) E _n } ... (1) K _p is a drive time gain, θ is a control period, and T _i is an integration time. Here, E _n is a deviation from the actual outlet temperature T _AR detected by the sensor of each outlet based on the switching mode from the target outlet temperature T _AO blown out from each outlet of the vehicle air conditioner 100, It is calculated by the following equation (2). _{E n = T AO -T AR .........} (2) the target outlet air temperature T _AO is based on the respective output signal correction constant C
Is calculated by the following equation (3). T _AO = K _set × T _set −K _r × T _r −K _am × T _am −K _s × T _s + C (3) where K _set is the temperature setting gain and K _r is the inside air temperature gain.
K _am is the outside air temperature gain, and K _s is the solar radiation gain.
Further, the outlet temperature T _AR is VENT outlet temperature sensor 37 in the VENT mode, FOOT outlet temperature sensor 38 in the FOOT mode, B /
VENT outlet temperature sensor 37 and FOOT outlet temperature sensor 38 in L mode, DEF outlet temperature sensor 3 in DEF mode
It is calculated as a function of each output signal from 9.

Next, the EC used in the apparatus of this embodiment
Description will be given based on the flowchart of FIG. 3 showing the processing procedure of U4. In addition, this flow chart shows the temperature setting device 27.
Is executed every time a new set temperature T _set is input by operating. First, it is determined whether or not the absolute value of the difference between the current set temperature (T _set ) _n and the previous set temperature (T _set ) _n-1 newly input in step 100 is 3 ° C. or more. .. This judgment criterion of 3 ° C. varies depending on the characteristics of the air conditioning unit and a predetermined value corresponding to that unit is set. If the absolute value of the difference between the set temperatures is less than 3 ° C. in step 100, the process immediately proceeds to step 110, and the drive time gain (hereinafter referred to as gain value) K _p in the above equation (1) is set to the normal control value. Leave as it is and end this program. That is, in this case, since there is not much difference between the set temperatures, the value of the normal control that substantially satisfies the responsiveness and stability of the blowout temperature is adopted. In step 100 described above, the absolute value of the difference between the set temperatures is 3
If the temperature is equal to or higher than ° C, the process proceeds to step 102. At step 102, it is judged if the current set temperature (T _set ) _n is between 24 ° C and 26 ° C. This criterion is 24 ° C to 26
C is a driver's usual set temperature ± 1 to 1.5 C, and this temperature range can be changed as appropriate. If the current set temperature (T _set ) _n is between 24 ° C. and 26 ° C. in step 102, the process proceeds to step 104, the gain value K _{p in the} equation (1) above is removed from the normal control, and the normal control value is used. Change to a smaller value. That is, if the absolute value of the difference between the set temperatures is large, the blowout temperature may change greatly (hunting may occur). Since the preset temperature this time is within the temperature range of 24 ° C. to 26 ° C., for example, hot air is temporarily blown out from the air outlet so that the air conditioning device does not feel uncomfortable. Therefore, the gain value is set to a small value, and the stability of the blowout temperature is emphasized. If the current set temperature (T _set ) _n is not between 24 ° C. and 26 ° C. in step 102, the process proceeds to step 106 and the gain value K _p in the above equation (1) remains the value of the normal control or Remove from normal control and change to a value larger than that of normal control. That is, if the absolute value of the difference between the set temperatures is large, the blowout temperature may change greatly (hunting may occur). However, since the set temperature this time is not within the temperature range of 24 ° C to 26 ° C, the air mix dampers 16 and 18 do not stop in the intermediate region,
If the temperature is 20 ° C, it will be CO
Hunting is less likely to occur because the transition is made in one direction, such as the OL side and the HOT side at 30 ° C. Therefore, the gain value is set to a large value and control is performed with emphasis on the responsiveness of the blowout temperature. Step 10 above
4 or after the processing of step 106, a predetermined time elapses in step 108, for example, after about 12 seconds elapse, the process proceeds to step 110, the gain value is returned from the value up to that time to the value of the normal control, and the program ends. To do. The determining means is achieved by steps 100 and 102, the first computing means is performed by step 106, and the second computing means is performed by step 104.

Next, the responsivity and stability of the blowout temperature with respect to changes in the gain value K _p will be described with reference to FIG.
Note that FIG. 4A shows the case where the gain value K _p is large, and FIG. 4B shows the case where the gain value K _p is small. As shown in FIG. 4A, when the gain value K _p is large, the set temperature T
_{When the set} is changed from 19 ° C. to 25 ° C., the blowout temperature T _AR has good responsiveness, but it converges to the set temperature with a large change (hunting occurs). Moreover, as shown in FIG. 4B, when the gain value K _p is small, the set temperature T
_{When the set} is changed from 19 ° C to 25 ° C, the blowout temperature T _AR has poor responsiveness, but gradually changes to converge to the set temperature (no hunting occurs).

Next, assuming that the set temperature T _set is changed from 19 ° C. to 25 ° C. in the vehicle air conditioner 100 described above,
An example of control using specific numerical values will be described. Assuming that K _set = 7 in the above equation (3), the value of the target outlet temperature T _AO rises by (25−19) × 7 = 42, assuming that the other terms remain unchanged. Assuming that the previous target outlet temperature T _AO is −36 and the outlet temperature T _AR is 5, the previous deviation E _n−1 is −
It becomes 41 (= -36-5). Similarly, the deviation E _n this time is 1
It becomes {= (-36 + 42) -5}. Here, the control cycle θ is 4
Let sec and integration time T _i be 5 sec, respectively.
Further, the gain value K _p is a large value with good response described above.
Assuming 0.04, substitute each value into Eq. (1). Then, SWh = 0.04 {1-(− 41) + (4/5)} ≈1.71. In other words, the servo motor 26 is C for 1.71sec.
Driven from the OOL side to the HOT side (Fig. 5 (a) → Fig. 5
(b)). The blowing temperature T _AR changes from 5 ° C to 29.2 ° C based on the change in the servo motor position. Here, the servo motor 2
6 is configured to reach the HOT side (right end position) from the COOL side (left end position) by being driven for about 4 seconds. Next, as for the deviation E _{n + 1} of the next time, the value of the target outlet temperature T _AO remains 6 (= −36 + 42) immediately after the outlet temperature changes, and remains at −23.2 (= 6−). 29.
2) As a result, the equation (1) is obtained as follows: SWh = K _p {E _{n + 1} −E _n + (θ / T _i ) E _{n + 1} } = 0.04 {−23.2-1 + (4/5) (− 23.2)} ≒ -1.71, that is, as shown in Fig. 5 (c), the servo motor 2
6 is driven from the HOT side to the COL side for 1.71 seconds. Based on this change in the servo motor position, the outlet temperature T _AR
Is 29.2 ° C to 5 ° C. Then, if the same calculation is performed, the servo motor 26 is next 0.94se as shown in FIG. 5 (d).
It is driven from the COL side to the HOT side only during c. Based on this change in the servo motor position, the outlet temperature T _AR will change from 5 ° C
It becomes 15.8 ℃. Next, as shown in FIG. 5 (e), the servo motor 26 is driven from the HOT side to the COL side for 0.69 sec. The blowing temperature T _AR changes from 15.8 ° C to 5 ° C based on the change in the servo motor position. As described above, when the gain value K _p = 0.04, the blowout temperature T _AR largely changes (hunting occurs) and lacks stability, but the responsiveness is good.

Similarly, when the gain value K _p of the normal control is 0.03, the relationship between the servo motor position and the blowout temperature is as shown in FIG. That is, in this case, the blowout temperature T _AR has satisfactory responsiveness, but hunting occurs, resulting in lack of stability. Further, when the gain value K _p = 0.02, the relationship between the servo motor position and the blowout temperature is as shown in FIG. That is, in this case, the outlet temperature T
As mentioned above, _AR has good stability at the expense of some responsiveness.

[0014]

According to the present invention, there is provided a discriminating means for discriminating which of the responsiveness to the blowout temperature or the stability is to be emphasized, based on the set temperature which is a parameter for determining the control target temperature and the variation thereof, and the discriminating means. When the determination result by the means emphasizes the responsiveness, the predetermined gain value in the adjustment amount calculation of the adjusting member based on the vehicle interior temperature, the control target temperature and the disturbance factor is temporarily changed from the value in the normal control or the value in the normal control. When the determination result by the determination unit emphasizes stability, on the other hand, the predetermined gain in the adjustment amount calculation of the adjustment member based on the vehicle interior temperature, the control target temperature and the disturbance factor. The second calculation means for temporarily reducing the value from the value in the normal control is provided, and when responsiveness until reaching the control target temperature is required, promptly Also, gently air temperature is changed in the case that requires stability. Therefore, in the vehicle air conditioner of the present invention, it is possible to match the human sensibilities without blowing out the wind having the extreme blowing temperature that causes a feeling of strangeness near the normal set temperature.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a vehicle air conditioner according to a specific embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a part of the outlet switching unit of FIG. 1 as seen through.

FIG. 3 is a flowchart showing a processing procedure of an ECU used in the apparatus of the embodiment.

FIG. 4 is an explanatory diagram showing changes in the blow-out temperature T _AR when the gain value K _p changes in the device of the embodiment.

FIG. 5 is an explanatory diagram showing the relationship between the servo motor position and the blowout temperature when the gain value K _p = 0.04 in the apparatus of the embodiment.

FIG. 6 is an explanatory diagram showing a relationship between a servo motor position and a blowing temperature when a gain value K _p = 0.03 in the apparatus of the embodiment.

FIG. 7 is an explanatory diagram showing the relationship between the servo motor position and the blowout temperature when the gain value K _p = 0.02 in the apparatus of the embodiment.

[Explanation of symbols]

1-Casing 2-Evaporator 3-Heater core 4-ECU (discrimination means, first and second computing means) 5-Inside / outside air switching section 6-Blowout outlet switching section 7-Inside / outside air switching damper 8-Blower 16, 18- Air mix damper 2
6-Servo motor 27-Temperature setting device 31-Evaporator outlet temperature sensor 32-Water temperature sensor 37-VENT outlet temperature sensor 38-FOOT outlet temperature sensor 39-DEF outlet temperature sensor 100-Vehicle air conditioner step 100, 102-Discriminating means Step 104
-Second calculation means Step 106-First calculation means

Claims (1)

[Claims] 1. A vehicle air conditioner for controlling an adjustment amount of an adjusting member for changing a vehicle interior temperature based on a vehicle interior temperature, a control target temperature and a disturbance factor, a set temperature being a parameter for determining the control target temperature. And a determination unit that determines whether to attach importance to responsiveness or stability to the blowout temperature based on the change amount, and when the determination result of the determination unit attaches importance to responsiveness, the vehicle interior temperature, the First calculation means for temporarily increasing a predetermined gain value in the adjustment amount calculation of the adjustment member based on the control target temperature and the disturbance factor from the value in the normal control or the value in the normal control, and the determination by the determination means When the result emphasizes stability, the predetermined value in the adjustment amount calculation of the adjustment member based on the vehicle interior temperature, the control target temperature, and the disturbance factor. And a second arithmetic means for temporarily reducing the gain value of the above from the value in the normal control.