JP3677879B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle air conditioner capable of independently controlling the temperature of two or more positions in a vehicle interior based on respective set temperatures.
[0002]
[Prior art and its problems]
2. Description of the Related Art A vehicle air conditioner is known in which the air blowing temperature can be adjusted independently in the front-rear direction according to the set temperatures of the front and rear seats. (For example, Nissan Motors new model car manual Y33-0 June, 1995).
In this type of air conditioner, when the blowout temperature control based on the set temperature reaches the limit (for example, when the air mix door reaches the full cool position or the full hot position), the blower fan air volume is increased. Although the desired air-conditioning conditions are satisfied, there is a problem that the comfort of the other occupant is impaired if the blower fan is common in the front seat / rear seat and the air flow is set to satisfy either of the front and rear occupant requirements. is there. Therefore, a manual switch (which is different from a normal fan speed changeover switch) that can adjust the air flow is conventionally provided, but this increases the cost and increases the operation frequency.
[0003]
An object of the present invention is, for example, in an air conditioner capable of left / right or front / rear independent control, without providing a manual air volume adjustment switch, even when one of the blowout temperature controls reaches the limit, both comforts are not lost as much as possible. There is in doing so.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a vehicle air conditioner according to the present invention includes a blower fan that is driven to blow air from the first and second outlets into the vehicle interior, and the first and second blowers. First and second temperature adjusting means for adjusting the outlet temperature from the outlet, command means for independently commanding the first and second set temperatures, and the first set temperature and the vehicle thermal load Temperature control means for controlling the first temperature adjusting means and controlling the second temperature adjusting means based on the second set temperature and the vehicle thermal load, and the first based on the first set temperature and the vehicle thermal load. When calculating the air flow control value of the engine and calculating the second air flow control value based on the second set temperature and the vehicle thermal load, and when the temperature adjustment by the first temperature adjusting device reaches a limit. Corrected the second airflow control value The air volume of the blower fan is increased based on the measured value, and when the temperature adjustment by the second temperature adjusting means reaches the limit, the air volume of the blower fan is increased based on the value obtained by correcting the first air volume control value. Air volume control means.
The invention of claim 2 corrects the first air flow control value by adding a correction value corresponding to the difference between the first and second air flow control values to the first air flow control value, and also corrects the correction value according to the difference. Is added to the second air flow control value to correct the second air flow control value.
According to a third aspect of the present invention, the correction value increases as the absolute value of the difference between the first and second air volume control values increases.
According to a fourth aspect of the present invention, there is provided a first fan request based on the blower fan, the first and second temperature adjusting means, the command means, the temperature control means, the first set temperature and the vehicle thermal load. Calculating means for calculating a first control value according to the air volume, and calculating a second control value according to the second fan required air volume based on the second set temperature and the vehicle thermal load; When the temperature adjustment by either one of the second temperature adjusting means reaches the limit, the first and second airflows are obtained so as to obtain an airflow intermediate between the first fan required airflow and the second fan required airflow. Air volume control means for controlling the blower fan based on the control value.
In the invention of claim 5, the first air outlet is the driver seat side air outlet, and the second air outlet is the passenger seat side air outlet.
[0005]
【The invention's effect】
According to the first aspect of the present invention, for example, when the temperature adjustment by the first temperature adjusting means reaches a limit, the air volume of the blower fan is increased based on the value obtained by correcting the second air volume control value. Therefore, unlike the case where the air volume is increased using the first air volume control value, the air volume from the second air outlet does not increase significantly. According to this, for example, when the first air outlet is the driver seat side air outlet and the second air outlet is the passenger seat side air outlet, one of the driver side passenger and the passenger seat side passenger is requested to some extent. Satisfy and do not greatly impair the comfort of the other.
In particular, if a correction value corresponding to the difference between the first and second air volume control values is added to the air volume control value, correction is made, for example, regardless of the difference between the required air volume on the driver seat side and the required air volume on the passenger seat side. Air volume can be set.
According to the fourth aspect of the present invention, when the temperature adjustment by either one of the first and second temperature adjusting means reaches the limit, it is intermediate between the first fan required air volume and the second fan required air volume. Since the air volume is obtained, the same effect as that of the first aspect can be obtained.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a configuration diagram of a vehicle air conditioner according to the present invention. An air conditioning duct 10 is provided with an air introduction port 11, a blower fan 12, an evaporator 13, and a heater core 14. The evaporator 13 constitutes a part of a known refrigeration cycle, and cools the air by exchanging heat between the refrigerant pumped by the compressor and the air. Reference numeral 15 denotes an intake door that sets an introduction ratio of outside air and inside air.
[0007]
The air conditioner according to the present embodiment can control the left and right independent control, that is, the air conditioning control can be performed independently on the driver seat side and the passenger seat side. For this reason, the inside of the air conditioning duct 10 is located immediately downstream of the evaporator 13 from the driver seat side. It is partitioned into a space 10DR and a passenger seat side space 10AS. In the spaces 10DR and 10AS, air mix doors 16DR and 16AS, vent air outlets 17DR and 17AS, foot air outlets 18DR and 18AS, defroster air outlets 19DR and 19AS, and mode doors 20DR and 21DR for adjusting the amount of air discharged from each air outlet 22DR: 20AS, 21AS, and 22AS are provided, respectively.
[0008]
When the blower fan 12 is driven, outside air or inside air is introduced into the air conditioning duct 10 from the air introduction port 11, cooled by the evaporator 13, and then guided to the spaces 10 DR and 10 AS. The air guided to the spaces 10DR and 10AS passes through the heater core 14 by an amount corresponding to the opening degree of the air mix doors 16DR and 16AS, respectively, and the remainder bypasses the heater core 14 and is mixed again. In particular, when the air mix doors 16DR and 16AS are at the full hot position indicated by the solid line, all the air passes through the heater core 14, and when the air mix doors 16DR and 16AS are at the full cool position indicated by the two-dot chain line, all the air bypasses the heater core 14.
[0009]
The air whose temperature has been adjusted according to the opening degree of the air mix door is blown into the vehicle interior from the outlet. Air from the air outlets 17DR, 18DR, and 19DR is blown to the driver seat side, and air from the air outlets 17AS, 18AS, and 19AS is blown to the passenger seat side. In addition, by controlling the mode door drive, the vent mode is mainly used for blowing air from the vent outlet, the foot mode for mainly blowing air from the foot outlet, and the defroster mode for mainly blowing air from the defroster outlet. The exit mode can be set.
[0010]
31 is an intake door actuator for driving an intake door, 32 is a power transistor for driving a blower fan, 33DR and 33AS are air mix door actuators for driving the air mix doors 16DR and 16AS, and 34 is a mode door actuator for driving a mode door. These are connected to the control circuit 35. The control circuit 35 also includes an indoor temperature sensor 41 for detecting the vehicle interior temperature, an outside air temperature sensor 42 for detecting the outside air temperature, a solar radiation sensor 43DR for detecting the driver seat side solar radiation amount, and a solar radiation sensor for detecting the passenger seat side solar radiation amount. 43AS, an intake sensor 44 for detecting the air temperature downstream of the evaporator, and various operation members 50 provided in the passenger compartment are connected.
[0011]
The operation member 50 performs a driver's seat side set temperature dial 51DR for adjusting the driver's seat side set temperature, a passenger's seat side set temperature dial 51AS for adjusting the passenger's seat side set temperature, and right / left independent control. Left and right independent control switch 52 for commanding the air flow, air volume changeover switch 53 for manually switching the blower fan air volume, and the like. The driver's seat side set temperature dial 51DR is disposed on the driver's seat side so that it can be easily operated from the driver's seat, and the passenger's seat side set temperature dial 51AS is disposed on the passenger's seat side so that it can be easily operated from the driver's seat.
[0012]
In the vehicle air conditioner configured as described above, when the left and right independent control is not instructed, the control circuit 35 and the driver seat side set temperature set by the driver seat side temperature setting dial 51DR and the indoor temperature sensor 41 are set. Based on the detection outputs (vehicle thermal load) of the outside air temperature sensor 42, the solar radiation sensors 43DR, 43AS, etc., the driver seat side and passenger seat side air mix door openings are controlled to be the same. Therefore, the blowing temperature is the same on the driver's seat side and the passenger seat side. On the other hand, when the left / right independent control is instructed, the driver side air mix door opening is controlled based on the driver side set temperature and the vehicle thermal load set by the driver side temperature setting dial 51DR, and the assistant The passenger-side air mix door opening is controlled based on the passenger-side set temperature and vehicle heat load set by the seat-side temperature setting dial 51AS. Therefore, when the driver's seat side set temperature and the passenger seat side set temperature are different, the blowing temperature is different between the driver seat side and the passenger seat side.
[0013]
When the passenger side occupant lowers the set temperature, for example, at the time of cooling in the left and right independent control, the passenger side air mix door 16AS moves to the full cool side accordingly, and the blowing temperature on the passenger seat side decreases. However, if the air mix door 16AS is already in the full cool position and the blowout temperature cannot be lowered any further (for example, this may occur when the outside air temperature is high and the amount of solar radiation is large), the passenger's seat side passenger's request is satisfied. Can only increase the blower fan airflow. However, when the blower fan air flow rate is increased, the air flow rate on the driver seat side is increased simultaneously with the air flow rate on the passenger seat side, and the driver's seat side passenger may feel uncomfortable. Therefore, in this embodiment, in such a case, depending on the difference between the required air volume on the driver's side and the required air volume on the passenger's side, the passenger's side passengers satisfy the passenger's side passengers to some extent and the driver's side passengers feel uncomfortable. Increase the air volume to the extent that you do not feel it.
[0014]
FIG. 2 shows a flow for realizing such air volume control.
This control is executed by the control circuit 35 and is periodically called from the main program. In step S1, it is determined whether or not the air volume changeover switch 53 has been operated. If it has been operated, the blower fan applied voltage VF is set in accordance with the operation in step S2. The higher the applied voltage VF, the higher the fan speed, that is, the air volume.
[0015]
If the air volume changeover switch 53 is not operated, the process proceeds to step S3 to set the air volume automatically, and variables L, M, N, and P are set. In step S4, blower fan target applied voltages VFDR and VFAS corresponding to the driver seat side and passenger seat side target blowing temperatures XMDR and XMAS are obtained from the illustrated characteristics, respectively. These target applied voltages VFDR and VFAS are values corresponding to the required air volumes on the driver's seat side and the passenger seat side, respectively. As is well known, the target blowout temperatures XMDR and XMAS are values calculated by the vehicle interior temperature, the outside air temperature, the suction temperature detected by each sensor, the set temperature set by each temperature setting dial 51DR, 51AS, and the like. The driver seat side set temperature is taken into account, and the passenger seat side set temperature is added to XMAS. In addition to the target applied voltage, an air mix door opening degree, an air outlet, and the like are controlled by the target blowing temperatures XMDR and XMAS.
[0016]
In step S5, it is determined whether the left and right independent flag is on or off. This flag is turned on when a left / right independent control command (for example, operation of the left / right independent control switch 52) is made, and is turned off when there is no command. When the left and right independent flag is off, that is, when the left and right independent control is not performed, VFDR is set as the blower fan applied voltage VF in step S6. If the left / right independent flag is on, that is, if left / right independent control is performed, the process proceeds to step S7, and whether or not any of the current driver's seat side and passenger seat side air mix doors 16DR, 16AS is at the full cool position or the full hot position. If NO is determined, the process proceeds to step S6. In this case, there is not much increase or decrease in the blower fan air volume, and air conditioning control is mainly performed by changing the air mix door opening.
[0017]
On the other hand, if either of the air mix doors 16DR and 16AS is in the full cool position or the full hot position, it is determined that the air volume must be increased to satisfy the passenger's request, and the process proceeds to step S8. In step S8, it is determined whether the target applied voltage VFDR corresponding to the required air volume on the driver's seat side and the target applied voltage VFAS corresponding to the required air volume on the passenger seat side are larger. If the air mix door is in the full cool position or the full hot position, the process proceeds to step S9.
[0018]
In step S9,
VF = VFAS + αVF
Thus, the blower fan applied voltage VF is obtained. αVF is a correction value determined according to the absolute value of the difference between VFDR and VFAS as shown in FIG. 3, and increases as the absolute value increases.
[0019]
The reason for obtaining VF by the above equation will be described with reference to FIG.
For example, it is assumed that the air mix door reaches the full cool position or the full hot position when the target blowing temperature reaches a predetermined value, and at this time, the target applied voltage is set to the predetermined value VFL. In the present embodiment, as shown in FIG. 4, the difference between the minimum value VFMIN of the applied voltage VF and the applied voltage VFL when the air mix door reaches the full hot position or the full cool position is 0.5V. . The target applied voltage VFDR is shown by operating the driver side temperature setting dial 51DR or increasing the amount of solar radiation on the driver side when the driver side and passenger side target applied voltages are both the minimum value VFMIN when the cooling is stable. When VFDR1 (> VFL) is reached, the driver side air mix door 16DR is naturally driven to the full cool position, and VF = VFDR1 needs to be satisfied in order to satisfy the requirements of the driver side occupant.
[0020]
However, when VF = VFDR1, the required air volume (depending on VFMIN) of the passenger on the passenger seat side is greatly exceeded. According to the above formula, if the absolute value of VFDR1-VFMIN, that is, VFDR-VFAS is within 2V,
VF = VFAS + αVF = VFMIN + 0.5 = VFL
It becomes. Thus, VF is an intermediate value between the driver's seat side required voltage and the passenger's seat side required voltage, satisfying the passenger's seat side passenger's request to some extent, and preventing the driver's seat side passenger from feeling uncomfortable. Similarly, if VFDR1-VFMIN is greater than 2 and within 5, VF = VFMIN + 1.5 = VFL + 1, and if VFDR1-VFMIN is greater than 5, VF = VFMIN + 2.5 = VFL + 2, both of which are VF This is an intermediate value between the passenger side required voltage and the passenger side required voltage.
[0021]
If it is determined in step S8 that the passenger-side target applied voltage is greater, that is, the passenger-side air mix door is in the full cool or full hot position, the process proceeds to step S10.
VF = VFDR + αVF
Thus, the blower fan applied voltage VF is obtained. In this case as well, VF is an intermediate value between the driver seat side required voltage and the passenger seat side required voltage, as described above.
[0022]
In the configuration of the above embodiment, the driver side air mix door 16DR is the first temperature adjusting means, the passenger side air mix door 16AS is the second temperature adjusting means, and the driver side and passenger side temperature settings. Dials 51DR and 51AS constitute command means, and control circuit 35 constitutes temperature control means, calculation means, and air volume control means.
[0023]
Note that the value of αVF is not limited to that shown in FIG. 4, and the formula for obtaining VF when the air mix door is at the full cool position or the full hot position is not limited to the above. Further, although an example in which the driver's seat side and the passenger seat side are independently controlled has been shown, the present invention can be similarly applied to those in which the front seat and the rear seat are independently controlled.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a vehicle air conditioner according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a procedure of air volume control.
FIG. 3 is a diagram showing correction values used for air volume control.
FIG. 4 is a diagram for explaining air volume control when the air mix door opening exceeds a limit value.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Air conditioning duct 11 Air inlet 12 Blower fan 13 Evaporator 14 Heater core 16DR, 16AS Air mix door 17DR, 17AS, 18DR, 18AS, 19DR, 19AS Air outlet 33DR, 33AS Air mix door actuator 35 Control circuit 41 Indoor temperature sensor 42 Outside temperature Sensor 43DR, 43AS Solar radiation sensor 51DR, 51AS Temperature setting dial 52 Left and right independent control switch

Claims (5)

A blower fan driven to blow air from the first and second outlets into the vehicle interior;
First and second temperature adjusting means for adjusting the temperature of air blown from the first and second air outlets, respectively;
Command means for independently commanding the first and second set temperatures;
Temperature control for controlling the first temperature adjusting means based on the first set temperature and the vehicle thermal load, and for controlling the second temperature adjusting means based on the second set temperature and the vehicle thermal load. Means,
Calculating means for calculating a first air flow control value based on the first set temperature and the vehicle thermal load, and calculating a second air flow control value based on the second set temperature and the vehicle heat load;
When the temperature adjustment by the first temperature adjustment means reaches a limit, the air volume of the blower fan is increased based on the value obtained by correcting the second air volume control value, and the second temperature adjustment means An air conditioner for vehicles, comprising: an air volume control means for increasing the air volume of the blower fan based on a value obtained by correcting the first air volume control value when the temperature adjustment reaches a limit. The air volume control means corrects the first air volume control value by adding a correction value corresponding to the difference between the first and second air volume control values to the first air volume control value, and according to the difference. The vehicle air conditioner according to claim 1, wherein the second air flow control value is corrected by adding the corrected value to the second air flow control value. The vehicle air conditioner according to claim 2, wherein the correction value increases as the absolute value of the difference between the first and second air flow control values increases. A blower fan driven to blow air from the first and second outlets into the vehicle interior;
First and second temperature adjusting means for adjusting the temperature of air blown from the first and second air outlets, respectively;
Command means for independently commanding the first and second set temperatures;
Temperature control for controlling the first temperature adjusting means based on the first set temperature and the vehicle thermal load, and for controlling the second temperature adjusting means based on the second set temperature and the vehicle thermal load. Means,
A first control value corresponding to the first fan required air volume is calculated based on the first set temperature and the vehicle thermal load, and a second fan request is calculated based on the second set temperature and the vehicle thermal load. Computing means for computing a second control value according to the air volume;
When the temperature adjustment by either one of the first and second temperature adjusting means reaches the limit, an air volume intermediate between the first fan required air volume and the second fan required air volume is obtained. An air conditioner for a vehicle comprising: an air volume control means for controlling the blower fan based on the first and second control values. The first air outlet is a driver's seat side air outlet that blows out air to the driver's seat side in the passenger compartment, and the second air outlet is a passenger seat side outlet that blows air out to the passenger's seat side in the passenger compartment. It is an exit, The air conditioner for vehicles in any one of Claims 1-4 characterized by the above-mentioned.

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