JPH0585145A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To provide an air conditioner for a vehicle which can perform control according to the proper solar radiation amount regardless of the elevation of the sun. CONSTITUTION:An air conditioner for a vehicle comprises a solar radiation sensor 101 for detecting the solar radiation amount a correcting means 102 for correcting the detected solar radiation amount, a gain setting means 103 for setting a gain by which the correction value of the solar radiation amount is multiplied, and a control means 104 for controlling the air conditioning environment according to the amount obtained by multiplying at least the correction value of the solar radiation amount by the gain. A correcting means 102 comprises a positon detecting mens 105 for detecting the position of a vehicle, a direction detecting means 106 for detecting the direction of a vehicle and a date and hour detecting means 107 for detecting the current date and hour detecting means, wherein according to the detected position of the vehicle and current date and hour, the solar radiation amount of the solar radiation sensor 101 is corrected, and the gain setting means 103 is adapted to set a gain according to the detected direction of the vehicle and current date and hour.

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 controlling an air-conditioning environment (for example, blowout temperature, blown air volume, blowout port, etc.) according to the amount of solar radiation.

[0002]

2. Description of the Related Art A solar radiation sensor for detecting the amount of solar radiation is provided, and an air mix door, a blower fan applied voltage and a mode door actuator are controlled according to the amount of solar radiation, outside air temperature, indoor temperature, etc. (vehicle heat load). Is known as a vehicle air conditioner that automatically controls the temperature, air volume, and air outlet into the passenger compartment (for example, Nissan Motor Issued Service Weekly Report No. 578, June 1987).

[0003]

By the way, since the solar radiation sensor is usually provided near the windshield in the vehicle compartment where it is easy to get sunlight, when the sun elevation angle is high such as daytime and daytime, the solar radiation sensor enters the actual vehicle compartment. Although the amount of solar radiation is small, the detection value of the solar radiation sensor becomes higher than it actually is. On the contrary, when the sun elevation angle is low such as at dawn or at sunset, the detected value is lower than the actual solar radiation amount because the incident angle to the solar radiation sensor is small although the solar radiation amount into the vehicle interior is large. In the past, since the blowout temperature, the blown air amount, and the blowout port were controlled based on the amount of solar radiation different from the actual amount, it was not possible to perform control in accordance with the feeling of the occupant, which might give an occupant an uncomfortable feeling. It was

An object of the present invention is to provide an air conditioning system for a vehicle, which can be controlled based on an appropriate amount of solar radiation regardless of the sun elevation angle.

[0005]

The invention will be described with reference to FIG. 1, which is a diagram corresponding to a claim. In the present invention, a solar radiation sensor 101 for detecting the amount of solar radiation, a correction means 102 for correcting the detected amount of solar radiation, and a solar radiation amount The present invention is applied to a vehicle air conditioner including a gain setting means 103 for setting a gain to be multiplied by a correction value and a control means 104 for controlling an air conditioning environment based on at least an amount of a correction value of solar radiation multiplied by a gain. It The correction means 102 includes a position detection means 105 for detecting the position of the vehicle (for example, latitude and longitude), a direction detection means 106 for detecting the direction of the vehicle, and a date and time detection means 107 for detecting the current date and time. And the above problem is solved by configuring the gain setting means 103 as follows. That is, the correction unit 102 uses the solar radiation sensor 10 based on the detected vehicle position and the current date and time.
1 and the gain setting means 1
03 sets the gain based on the detected vehicle orientation and the current date and time.

[0006]

The correcting means 102 corrects the amount of solar radiation detected by the solar radiation sensor 101 based on the position of the vehicle and the current date and time. Here, the above-mentioned sun elevation angle is substantially determined according to this vehicle position and date and time, so the solar radiation amount after the above correction is the solar radiation amount actually incident on the vehicle interior at that time regardless of the elevation of the sun elevation angle. Is extremely close to. Further, the gain setting means 103 sets a gain to be given to the correction value of the solar radiation amount based on the detected vehicle direction and the current date and time. That is, the gain is set based on the incident direction of solar radiation. Then, the control unit 104 controls the air conditioning environment based on the amount obtained by multiplying the correction value of the solar radiation amount by the gain.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The vehicle air conditioner according to the present invention, as shown in FIG. 2, is a compressor for a compression refrigeration cycle including a variable displacement compressor 2, a condenser 3, an evaporator 4, a liquid tank 5, and an expansion valve 6 driven by an engine 1. The laser unit 100 is provided. Variable displacement compressor 2
When the suction pressure exceeds the set pressure, the inclination angle is increased to increase the discharge capacity, and the set pressure is controlled by the solenoid current supplied from the CPU 41 shown in FIG. A constant capacity compressor may be used. Further, the evaporator 4 is arranged in an air conditioning duct 7 having an outside air introduction port 7a and an inside air introduction port 7b.

Each of the inlets 7a and 7b is provided with an inside / outside air switching door (intake door) 8 for controlling the flow rate of air introduced into the air conditioning duct 7. A blower fan 9, a heater core 10, and an air mix door 11 are provided in the air conditioning duct 7 as is well known. The air mix door 11 controls the blowing temperature by adjusting the amount of air passing through the heater core 10. Further, the air conditioning duct 7 is provided with a vent outlet 7c, a foot outlet 7d, and a defroster outlet 7e. It is adjusted according to the degree.

Here, the bend outlet 7c is for blowing air toward the upper half of the occupant, the foot outlet 7d is for blowing air toward the occupant's feet, and the defroster outlet 7e is a window. It is for blowing air toward the glass. Further, in the present embodiment, as the outlet mode, a vent mode that mainly blows air from the vent outlet 7c, a foot mode that mainly blows air from the foot outlet 7d, and an air that mainly blows air from the defroster outlet 12e. It is possible to set four modes: a differential mode for blowing out air and a bi-level mode (B / L mode) for blowing out air from the vent outlet 7c and the foot outlet 7d.

FIG. 3 shows a control system of the vehicle air conditioner. The control circuit 41 including a CPU, ROM, RAM, etc. (hereinafter simply referred to as the CPU 41) includes an input circuit 42.
An outside air temperature sensor 4 for detecting the outside air temperature Tamb via
3, an indoor temperature sensor 44 for detecting the vehicle interior temperature Tinc,
A solar radiation sensor 45 that detects the amount of solar radiation Qsun and an air mix door opening sensor 46 that detects the opening X of the air mix door 11 are connected, and various temperature information and heat quantity information are input to the CPU 41 from these sensors 43 to 46. It Also,
The CPU 41 has a well-known drive guide system 47.
(For example, "NISSAN MOTOR CO., LTD.
No. June 1989 ”), the current position (latitude, longitude) of the vehicle and the direction of the vehicle detected are input.
Information such as date and time is also input from a clock (not shown).

Further, in the CPU 41, via an output circuit 49, an intake actuator 50 for driving the intake door 8, an air mix door actuator 51 for driving the air mix door 11, a vent door actuator 52 for driving the vent door 12, and a foot door 13 are provided. Is connected to a foot door actuator 53 that drives the defroster door 14, and a blower fan control circuit 55 is connected to the defroster door actuator 54 that drives the defroster door 14. A blower fan motor 9M is connected to the blower fan control circuit 55.

Next, the procedure of the air conditioning control executed by the CPU 41 will be described with reference to the flow charts of FIGS. FIG. 4 shows a main flowchart, and first, step S1.
At 0, the initial setting is performed, and in the normal auto air conditioner mode, for example, the set temperature Tptc is initially set at 25 ° C. Next, in step S20, various information from each sensor is input. The data information of each of these sensors will be specifically described. The set temperature Tptc is from a control panel (not shown), the vehicle interior temperature Tinc is from the indoor temperature sensor 44, the outside air temperature Tamb is from the outside air temperature sensor 43, and the amount of solar radiation Qs.
un is given from the solar radiation sensor 45, respectively.

Next, in step S30, the outside air temperature sensor 4
The outside air temperature Tamb obtained from No. 3 is processed to a value Tam corresponding to the actual outside air temperature by removing influences from other heat sources. In step S40, the solar radiation amount information from the solar radiation sensor 45 is corrected to Q'sun according to the procedure described in detail later. In step S50, the set temperature Tptc set by the control panel is processed into a value T'ptc corrected according to the outside air temperature. In step S60, T'ptc, Tinc, Tam, Q'su
The target outlet temperature Xm is calculated from n, and the opening of the air mix door 11 is controlled according to the target outlet temperature Xm.

In step S70, the compressor 2 is controlled, and in step S80, the mode actuators 52, 5 are controlled.
The doors 12, 13 and 14 are driven by 3, 54 to set a predetermined outlet. In step S90, the intake door actuator 50 drives the intake door 8 to control the selective switching of the intake port, that is, the outside air introduction port and the inside air introduction port. Blower fan 2 in step S100
By controlling the air flow rate from the air outlet.
Then, the process returns to step S20.

FIG. 5 is a subroutine flowchart showing the details of the solar radiation sensor value correction processing in step S40 (FIG. 4) described above. First, in step S41, the position (latitude, longitude) of the vehicle detected by the drive guide system 47 is input, and the current date and time is input from a clock (not shown). Next, in step S42, the sun elevation angle α is obtained from the date and time, latitude and longitude. That is, a table in which the sun elevation angle α is associated with each date, longitude, and latitude is stored in advance in the CPU 41, and the sun elevation angle α corresponding to the input date, longitude, and latitude is selected from the table. Next, in step S43, the detected value of solar radiation Qsun and the sun elevation angle α
Then, the correction value Q'sun of the solar radiation amount is calculated by Q'sun = f (Qsun, α), and then the process is returned to the process of FIG.

That is, as described above, when the sun elevation angle is high (at noon), the detected value of the solar radiation sensor 45 is higher than the actual value although the actual amount of solar radiation into the vehicle interior is small.
On the other hand, when the sun elevation angle is low such as at dawn or sunset, the detected value of the solar radiation sensor is lower than the actual solar radiation amount because the incident angle to the solar radiation sensor 45 is small even though the solar radiation amount into the vehicle interior is large. Become. Therefore, in the process of FIG. 5, Qsun is corrected to Q'sun so as to have a value corresponding to the amount of solar radiation that actually enters the vehicle interior in accordance with the sun elevation angle α at the present time.

FIG. 6 is a subroutine flow chart showing the details of the air mix door control (step S60) described above. First, in step S601 of FIG. 5, the constant A,
B, D, and E are initialized, and then, in step S602, the current aerial door opening X and the vehicle direction d are input. In step S603, the incident directions β1 and β2 of the solar radiation are obtained by β1 = f (α, d) β2 = f (α, d) based on the sun elevation angle α and the heading d of the vehicle. Here, the incident direction β1 indicates an incident angle with respect to the vehicle front-rear direction, as shown in FIG. The incident direction β2 indicates the incident angle with respect to the vehicle left-right direction. The smaller the value, the larger the incident amount from the right side, and the larger the value, the larger the incident amount from the left side.

Next, in step S604, β1, β2
Based on the characteristics of FIGS. 10 (a) and 10 (b),
Ask for. Then, in step S605, the solar radiation gain C is obtained from C = −C1 · C2, and the process proceeds to step S606.

In step S606, Xm = (A + D) T'ptc + B * Tam + C * Q'sun-D * T
The target outlet temperature Xm is calculated based on inc + E, and then step S
At 607, the deviation S between the target outlet temperature Xm and the actual air mix door opening X (the value read in step S602) is calculated by S = Xm-X.

Then, in step S608, the deviation S is compared with a predetermined value So. If S <-So, then in step S609, the air mix door opening is set to the cold side, that is, to the closed side so that the flow rate of air passing through the heater unit 10 is reduced. If S> + So, step S
At 610, the air mix door opening is set to the hot side, that is, to the open side so that the flow rate of air passing through the heater unit 10 increases. If | S | ≦ + So, step S61
At 1, the current opening is maintained.

According to the procedure of FIG. 6 described above, the incident direction β1, of the solar radiation is calculated based on the sun elevation angle α and the vehicle direction d.
β2 is obtained, and the gain C is set based on this incident direction. Then, based on the value obtained by multiplying the correction value Q'sun of the solar radiation amount by this gain C, the target blowout temperature Xm is obtained by the above equation, and the air mix door 11 is drive-controlled so as to become the target blowout temperature Xm. To be done. That is, the blowout temperature is determined based on the amount of solar radiation that actually enters the vehicle interior and the incident direction of the solar radiation.

Further, FIG. 7 shows the above step S80 (FIG. 4).
4 is a subroutine flowchart showing details of the blowout port control of FIG. In FIG. 7, first, in step S81, it is determined whether or not a blowout port is commanded by a manual operation of a blowout port selection switch (not shown). When step S81 is affirmed, the process proceeds to step S82, and the doors 12, 13, 14 are driven according to the operation of the outlet selection switch to set the outlet. If step S81 is denied, step S
At 83, the air outlet is selected from the characteristics shown in the drawing based on the target air outlet temperature Xm calculated in step S606 of FIG. The diff mode is selected by a diff switch (not shown).

FIG. 8 is a subroutine flow chart showing the details of the air volume setting control in step S100 (FIG. 4). In FIG. 8, first, in step S101, it is determined whether or not the air volume is commanded by an air volume setting switch (not shown). When step S101 is affirmed, the process proceeds to step S102, in which the blower fan applied voltage V corresponding to the operation of the air volume setting switch is determined, and step S104 is performed.
Proceed to. When step S101 is denied, in step S103, the blower fan applied voltage V is obtained from the characteristic shown in the figure based on the target blowout temperature Xm calculated in step S606 of FIG. 6, and the process proceeds to step S104. In step S104, the blower fan control circuit 55
The applied voltage V determined in step S102 or S103 is applied to the blower fan motor 9M via. As a result, the blower fan 2 is driven with an air volume according to the applied voltage.

The above is the procedure of the air conditioning control by the CPU 41. According to this procedure, the blowout temperature, the blowout port, and the blower fan airflow are set based on the target blowout temperature Xm. The target outlet temperature Xm is calculated based on a value obtained by multiplying the correction value obtained by correcting the amount of solar radiation according to the sun elevation angle as described above by the gain C taking the incident direction of solar radiation into consideration. By the procedure, the air conditioning is controlled based on the amount of solar radiation that actually enters the vehicle interior regardless of the elevation of the sun elevation, and the incident direction of solar radiation is also added to the air conditioning control.

In the configuration of the above embodiment, the CPU 41
Correction means 102, gain setting means 103, control means 1
04, the drive guide system 47 is the position detecting means 1
05 and the direction detection means 106, respectively.

In the above description, the position and orientation of the vehicle are input from the drive guide system 47. However, in a vehicle not equipped with this drive guide system 47, dedicated detection means may be provided to obtain such information. Good.

[0027]

According to the present invention, the amount of solar radiation by the solar radiation sensor is corrected based on the position of the vehicle and the current date and time, that is, the sun elevation angle, and the air-conditioning environment is controlled based on the corrected value. Regardless of the elevation of the sun, the air-conditioning control is performed based on the amount of insolation that actually enters the vehicle compartment at that time, so that the control suitable for the occupant's feeling is possible. In addition, the gain given to the correction value of the amount of solar radiation is set based on the position and direction of the vehicle and the current date and time. Therefore, the incident direction of solar radiation is also taken into consideration in the air conditioning control, and it is more appropriate. Air conditioning can be controlled.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to a complaint.

FIG. 2 is a diagram showing a configuration of an air conditioner according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a control system of the air conditioner.

FIG. 4 is a main flowchart showing a procedure of air conditioning control.

FIG. 5 is a subroutine flowchart showing the details of the solar radiation amount correction processing.

FIG. 6 is a subroutine flowchart showing details of air mix door control.

FIG. 7 is a subroutine flow chart showing the procedure of outlet control.

FIG. 8 is a subroutine flowchart showing details of air volume control.

FIG. 9 is a diagram illustrating incident directions of solar radiation in a vehicle front-rear direction and a lateral direction.

FIG. 10 is a characteristic diagram showing a gain with respect to each incident direction.

[Explanation of symbols]

 2 Compressor 3 Condenser 4 Evaporator 7a Vent outlet 7b Foot outlet 7c Defroster outlet 9 Blower fan 10 Heater core 11 Air mix door 41 CPU 43 Outside air temperature sensor 44 Indoor temperature sensor 45 Solar radiation sensor 46 Air mix door opening sensor 47 Drive guide system 51 Air mix door actuator 52 Vent door actuator 53 Foot door actuator 54 Defroster door actuator 55 Blower fan control circuit 101 Solar radiation sensor 102 Correction means 103 Gain setting means 104 Control means 105 Position detection means 106 Direction detection means 107 Date / time detection means

Claims (1)

[Claims] 1. A solar radiation sensor for detecting the amount of solar radiation, a correction means for correcting the detected amount of solar radiation, a gain setting means for setting a gain to be multiplied with the correction value of the amount of solar radiation, and at least the amount of solar radiation A vehicle air conditioner including a control means for controlling an air conditioning environment based on an amount obtained by multiplying a correction value by the gain, a position detecting means for detecting a position of a vehicle, and a direction detecting means for detecting a direction of the vehicle. And a date and time detection means for detecting the current date and time, the correction means corrects the amount of solar radiation by the solar radiation sensor based on the detected vehicle position and the current date and time, and the gain setting means The vehicle air conditioner, wherein the gain is set based on the detected vehicle orientation and the current date and time.