JP3570179B2 - Vehicle air conditioning controller - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle air-conditioning control device, and more particularly to a vehicle air-conditioning control device that suppresses noise generated by a blowing unit by limiting a maximum value of an air volume.
[0002]
[Prior art]
The occupant feels the heat or cold in the passenger compartment and activates cooling or heating in hopes that this will be adjusted to an optimum temperature. Therefore, it is desirable that cooling or heating be performed promptly. Therefore, immediately after the cooling or heating operation, a control is generally performed in which the air volume is set to the maximum and the cool air or the hot air is blown out. However, it is known that when the air volume is increased, the noise of the blower fan increases with the air volume. Since the noise of the blower fan gives the occupant a feeling of discomfort, control has been considered in which air conditioning is performed at the maximum air flow until a certain condition is satisfied, and then the upper limit of the air flow is limited with an emphasis on noise reduction of the blower fan. Was. Examples of such conventional examples include JP-A-57-104406, JP-A-59-40918, JP-A-1-289712, and JP-A-1-153317.
[0003]
In Japanese Patent Application Laid-Open No. 57-104406, the upper limit of the air volume is limited after a certain period of time from the start of air conditioning. In JP-A-59-40918, the upper limit of the air flow is limited according to the total heat load in the vehicle compartment. In Japanese Patent Application Laid-Open No. 1-289712, when the temperature in the upper part of the vehicle compartment is controlled to an appropriate temperature, the upper limit of the airflow is limited. In Japanese Patent Application Laid-Open No. 1-153317, the upper limit of the airflow is controlled according to the noise in the vehicle interior.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional example, only the control that emphasizes quick temperature control or the noise reduction of the blower fan is mainly performed with one being the main and the other being the sub.
[0005]
[Object of the invention]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle air-conditioning control device which can solve the disadvantages of the conventional example and, in particular, can promote quick temperature control while reducing noise of a blower fan. .
[0006]
[Means for Solving the Problems]
In order to achieve this object, the present invention includes a blower that blows air into the vehicle compartment, and a blowout temperature controller that controls the temperature of air blown into the vehicle interior. In addition, a control unit is provided for controlling the temperature of air blown into the vehicle compartment and the amount of air blown by controlling the blowout temperature adjusting means and the air blowing means. The control unit determines a basic air flow based on the outside air temperature and a deviation between the set temperature and the inside air temperature, calculates a target air flow based on the basic air flow and a corrected air flow considering the insolation, and determines an air flow limit value based on the outside air temperature. It is determined whether the target air volume does not exceed the air volume limit value.If not, the target air volume is adopted.If the target air volume is exceeded, the air volume limit value is adopted and the air volume is used. And the blowout temperature is set higher or lower than the reference so as to compensate for this . This aims to achieve the above-mentioned object. In the present invention, for example, when cooling control is being performed, if the amount of air to be blown is limited to suppress noise by the blowing means, the blow-out temperature is set to be somewhat lower than the reference so as to compensate for this.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram of a vehicle air-conditioning control device according to the present embodiment. The control unit 5 is connected with an outside air temperature detecting means 1, an inside air temperature detecting means 2, an insolation detecting means 3, and a temperature setting means 4. The storage unit 6 is connected. Further, a blowing means 7, an outlet temperature adjusting means 8, an outlet selecting means 9, and an inlet selecting means 10 are connected.
[0008]
More specifically, the outside air temperature detection means 1 detects the temperature outside the vehicle. A sensor such as a thermistor may be used, or a unit that estimates the outside air temperature from the output of another element such as an inside air temperature detection unit may be used. The inside air temperature detecting means 2 detects the temperature inside the vehicle. A sensor such as a thermistor may be used, or a unit that estimates the inside air temperature from the output of another element such as an outside air temperature detection unit may be used. The solar radiation detecting means 3 detects the amount of solar radiation into the vehicle, and may employ a conventional general solar radiation sensor. The temperature setting means 4 is for the occupant to set a desired temperature in the vehicle, and may employ a rotary switch or the like. The control unit 5 includes a microcomputer that performs processing by executing a program prepared in advance, and a conventional general driving unit for driving a control target. The storage unit 6 is preferably a RAM or a ROM, and stores programs executed by the control unit 5 and parameters required for processing. The blower 7 is, for example, a blower fan. The blowout temperature adjusting means 8 includes conventional temperature adjusting elements such as an evaporator, a compressor, a heater, and an air mix damper. The outlet selecting means 9 includes, for example, a damper capable of switching a blowing mode such as a vent mode, a bi-level mode, and a heat mode, and an actuator thereof. The inlet selection means 10 includes a damper that can switch between inside air introduction and outside air introduction, and an actuator thereof.
[0009]
Next, the operation of the present embodiment will be described. FIG. 2 is a flowchart of the air conditioning control performed by the control unit 5. When the ignition is turned on (Ig ON), the control unit 5 starts the processing in FIG. First, necessary initial settings are made (S1). Next, the outside temperature Ta is obtained from the outside temperature detection means 1, the inside temperature TR is obtained from the inside temperature detection means 2, the insolation S is obtained from the insolation detection means 3, and the set temperature Ts is obtained from the temperature setting means 4. The parameters are stored in the storage unit 6 (S2). Subsequently, the amount of air blown into the vehicle is determined (S3). Subsequently, the temperature of air blown into the vehicle is determined (S4). Subsequently, the air outlet into the vehicle is determined (S5). The determination of the outlet can be performed, for example, by the following method. Assuming that the blowing temperature is TBLW, control may be performed such that vent blowing is performed when TBLW <T1, bi-level blowing is performed when T1 ≦ TBLW <T2, and heat blowing is performed when T2 ≦ TBLW. Here, T1 and T2 are predetermined thresholds. Next, it is determined whether to perform air conditioning by introducing outside air or to perform air conditioning by circulating inside air (S6). The introduction port can be determined, for example, by the following method. Assuming that the outside air temperature is Ta, control may be performed such that outside air is introduced when Ta <T3, and inside air circulation is selected when T3 ≦ Ta. When the processes up to this point are completed, the control unit 5 performs the next drive control (S7). The blowing means 7 is driven according to the determined air volume. The blowout temperature adjusting means 8 is driven according to the determined blowout temperature. The outlet selection means 9 is driven according to the determined outlet. The inlet selector 10 is driven according to the determined inlet.
[0010]
Next, the processing for determining the air volume shown in S3 will be described in detail with reference to the flowchart of FIG. When it is time to execute the processing for determining the air volume, the control unit 5 calculates the target air volume FAN based on the following equation (1) (S31).
[0011]
FAN = f1 (Ts, Ta, TR) + f2 (S) (1)
[0012]
Here, f1 () is a function indicating the basic airflow. For example, it can be defined as a function having the characteristics shown in FIG. As described above, Ts is the set temperature, Ta is the outside air temperature, and TR is the inside air temperature. Each value read from the storage unit 6 is used. Further, f2 () is a function indicating a corrected air volume in consideration of solar radiation. For example, it can be defined as a function having the characteristics shown in FIG. As described above, S is the amount of solar radiation, and the value read from the storage unit 6 is used. In FIGS. 5 and 6, the vertical axis represents a percentage with the maximum blowing capacity of the blowing means 7 being 100%. In FIG. 5, f1 is proportional to Ta. F1 is proportional to | Ts-TR |. The proportional coefficient may be different between the positive side and the negative side. However, f1 does not exceed 100%. In FIG. 6, f2 is proportional to S. However, f2 does not exceed 25%.
[0013]
Subsequently, the control unit 5 calculates the air volume limit value FANLIT based on the following equation (2) (S32).
[0014]
FANLIT = f3 (Ta) (2)
[0015]
Here, f3 () can be defined as a function having the characteristics shown in FIG. 7, for example. As described above, Ta is the outside air temperature, and the value read from the storage unit 6 is used. In FIG. 7, the vertical axis indicates a percentage with the maximum blowing capacity of the blowing means 7 being 100%. In FIG. 7, f3 has a minimum value of 60% in the range of about 10 ° C. <Ta <20 ° C. The maximum value on the negative side is 100%, and the maximum value on the positive side is about 90%. In the meantime, the characteristics are set to change linearly.
[0016]
Subsequently, the control unit 5 determines whether the target air volume FAN exceeds the air volume limit value FANLIT (S33). As a result, if not exceeded, the target air volume FAN calculated in S31 is adopted as it is. On the other hand, when the airflow limit value FANLIT is exceeded, the value of the airflow limit value FANLIT is adopted as the target airflow FAN (S34). Therefore, the target air volume FAN does not exceed the air volume limit value FANLIT. The noise of the blowing means 7 is suppressed by the air volume restriction.
[0017]
Next, the blowout temperature determination processing shown in S4 will be described in detail with reference to the flowchart of FIG. In step S4, the control unit 5 calculates the basic blowout temperature TBLW based on the following equation (3) (S41).
[0018]
TBLW = KsTs−KaTa−KRTR−KSUNS + C (3)
[0019]
Here, Ks, Ka, KR, and KSUN are gains in the control system, and experimental values suitable for converging the internal air temperature to the set temperature are employed. C is a constant. Subsequently, the control unit 5 determines whether or not the target air volume FAN obtained by equation (1) exceeds the air volume limit value FANLIT obtained by equation (2) (S42). As a result, if it does not exceed, the basic blowing temperature TBLW obtained in S41 is adopted as the blowing temperature as it is. On the other hand, if the airflow limit value is exceeded, it is determined whether the cooling control is currently being performed (S43). For example, when the basic blowing temperature TBLW is lower than the set temperature Ts, it can be determined that the cooling control is being performed. As a result, if the cooling control is being performed, the basic blowing temperature TBLW is corrected by the following equation (4), and a blowing temperature somewhat lower than the basic blowing temperature is adopted (S44). Here, KF is a predetermined coefficient.
[0020]
TBLW = TBLW−KF {f1 (Ts, Ta, TR) + f2 (S) −FANIT} (4)
[0021]
On the other hand, if the cooling control is not being performed, the basic blowing temperature TBLW is corrected by the following equation (5), and a blowing temperature somewhat higher than the basic blowing temperature is adopted (S45). Here, KF is a predetermined coefficient.
[0022]
TBLW = TBLW + KF {f1 (Ts, Ta, TR) + f2 (S) -FANLIT} (5)
[0023]
As described above, according to the present embodiment, when the calculated target air volume exceeds the air volume limit value, the air volume itself is controlled not to exceed the air volume limit value, and the blowing temperature is adjusted so as to compensate for the limited air volume. Is set to be higher or lower than the reference, it is possible to promote quick temperature control while reducing noise of the blowing means.
[0024]
Next, another embodiment of the present invention will be described based on the flowchart of FIG. The present embodiment is different from the previous embodiment only in the part of the air volume determination process corresponding to S3 in FIG. Other configurations are the same as those of the above-described embodiment. Therefore, the same parts as those in the previous embodiment are denoted by the same reference numerals, and redundant description will be omitted.
[0025]
In the present embodiment, in the air volume determination process, it is determined whether or not there is a certain difference or more between the internal temperature TR and the set temperature Ts before calculating the air volume limit value FANLIT (S35). For example, it is determined whether or not Ts-TR <TRref is satisfied, using TRref as a fixed threshold value. As a result, when there is no large difference between the inside air temperature and the set temperature, the processing from S32 is executed as in the previous embodiment. On the other hand, when there is a certain gap or more, the airflow limit value is set to the maximum so as not to limit the airflow (S36). According to this, when the inside of the vehicle is extremely hot due to summer sunshine, the air volume can be prevented from being restricted, and the air conditioning control can be performed with the comfort of the occupant as the highest priority.
[0026]
Here, in each of the above-described embodiments, in the flowchart of FIG. 2, the air volume determination process is performed first, and then the blowout temperature is determined. However, including the order of these processes, the processes from S3 to S6 are performed. The order can be determined arbitrarily.
[0027]
【The invention's effect】
Since the present invention is configured and functions as described above, according to this, when the calculated target air volume exceeds the air volume limit value, the air volume itself is controlled so as not to exceed the air volume limit value, and the air volume is limited. An unprecedented superior air-conditioning control device for vehicles that sets the blow-out temperature higher or lower than the reference so as to compensate for the blown air volume, thereby facilitating quick temperature control while reducing the noise of the blowing means. Can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of one embodiment of the present invention and another embodiment.
FIG. 2 is a flowchart showing a flow of air conditioning control according to one embodiment and another embodiment of the present invention.
FIG. 3 is a flowchart illustrating in detail a process of determining an air volume employed in an embodiment of the present invention.
FIG. 4 is a flowchart showing in detail a blowout air flow rate determination process employed in one embodiment and another embodiment of the present invention.
FIG. 5 is a characteristic diagram illustrating a function f1 of a basic air volume.
FIG. 6 is a characteristic diagram illustrating a function f2 of the solar radiation correction air volume;
FIG. 7 is a characteristic diagram illustrating a function f3 of an airflow limit value.
FIG. 8 is a flowchart showing in detail a process of determining an air volume employed in another embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 outside temperature detecting means 2 inside temperature detecting means 3 insolation detecting means 4 temperature setting means 5 control unit 6 storage unit 7 blowing means 8 blowing temperature control means 9 outlet selecting means 10 inlet selecting means

Claims (2)

Blowing means for blowing air into the cabin, blowing temperature adjusting means for adjusting the temperature of air blown into the cabin, and controlling the blowing temperature adjusting means and the blowing means to control the temperature and amount of air blown into the cabin. And a control unit for controlling the vehicle air conditioning control device,
The control unit determines a basic air flow based on an outside air temperature and a deviation between a set temperature and an inside air temperature, calculates a target air flow based on the basic air flow and a corrected air flow considering solar radiation, and sets an air flow limit value based on the outside air temperature. Calculate and judge whether the target air volume does not exceed the air volume limit value.If not, the target air volume is adopted.If the target air volume is exceeded, the air volume limit value is adopted to adopt the air volume. with the restriction that, vehicular air conditioning control apparatus and sets the outlet temperature to higher or lower than the reference so as to compensate for this. The determination whether the target air volume does not exceed the air volume limit value is performed when a deviation between the set temperature and the inside air temperature is less than a predetermined value.If the deviation is equal to or more than a predetermined value, the determination is performed without performing the determination. The air conditioning control device for a vehicle according to claim 1, wherein a target air volume is adopted .

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