JP3518053B2 - Vehicle air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system for a vehicle, which controls the air conditioning in consideration of the intensity of solar radiation.

[0002]

2. Description of the Related Art A vehicle air conditioner is known which detects the intensity of solar radiation and performs air conditioning control (for example, air mix door control, outlet control, blower fan air volume control, etc.) based on the detection result (Nissan). Automobile New model manual U13-
1 September 1991).

[0003]

However, even if the intensity of solar radiation changes, humans cannot sense the change sensitively, and the human senses differ depending on the amount of change and the direction of change of the solar radiation intensity. For example, FIG. 7A is a diagram showing the relationship between the measured value of the solar radiation intensity and the solar radiation intensity that humans actually feel on the skin. The curve a shown by the solid line is the measured value, and the curve b shown by the alternate long and short dash line is human. Indicates the insolation intensity felt by the skin.
As shown in the figure, when the solar radiation intensity is rapidly increased, humans experience an increase in solar radiation intensity with a slight delay, and when the solar radiation intensity is rapidly reduced, humans experience a decrease in solar radiation intensity at a slow speed.

However, the conventional vehicle air conditioner is
The air-conditioning control is performed simply in accordance with the absolute amount of the solar radiation intensity without taking into consideration the deviation of the human sense as shown in FIG. 7. Therefore, for example, when the insolation intensity changes rapidly, the control is such that the opening of the air mix door and the air flow rate of the blower fan are changed correspondingly, that is, the insolation intensity actually felt by the occupant's skin is Different air conditioning controls were performed, and as a result, the occupants may feel discomfort.

An object of the present invention is to provide an air conditioning system for a vehicle in which the insolation intensity detected by the insolation sensor is corrected so as not to give an occupant an uncomfortable feeling and air conditioning control can be performed.

[0006]

The present invention will be described with reference to FIGS. 1 and 2 showing an embodiment. The present invention is based on a solar radiation sensor 63 for detecting the solar radiation intensity, and an air conditioner based on the detected solar radiation intensity. The present invention is applied to a vehicle air conditioner including a control unit 68 for controlling, and includes a correction unit that corrects the solar radiation intensity based on the detected amount and direction of change of the solar radiation intensity. It is a coefficient relating to the correction of the solar radiation intensity according to the magnitude relation between the detected solar radiation intensity and the stored solar radiation intensity and the storage means 68a for storing the solar radiation intensity, and the outside air temperature is closer to the reference temperature of the air conditioner. A coefficient setting means for setting a coefficient so that the response speed of correction of the solar radiation intensity becomes slow, and a deviation between the stored solar radiation intensity and the detected solar radiation intensity, the set coefficient, and the stored solar radiation intensity. On the basis of Correct the detected irradiance, control means, air mixing when the detection value of the solar irradiance is increased
Rotate the door 13 to the closed side to reduce the amount of reheat,
When the detected value of solar radiation intensity decreases Air mix door 13
Rotate to the open side to increase the amount of reheat,
The rotation speed on the closing side will be faster than the rotation speed on the opening side.
The air mix door 1 on the basis of the intensity of solar radiation, which is sea urchin modified
By performing the opening degree control of 3 , the above object is achieved. The invention according to claim 2, in which the air-conditioning system according to claim 1, the correction means includes a is filtering means, for setting the coefficient setting means the coefficients of the filtering means.

[0007]

In the invention described in claim 1, the solar radiation sensor 63
The solar radiation intensity is corrected based on the amount of change and the direction of change of the solar radiation intensity detected by, and the air conditioning control is performed based on the corrected solar radiation intensity. In the correction processing of the solar radiation intensity, the corrected solar radiation intensity is stored in the storage unit 68a, and the coefficient relating to the correction of the solar radiation intensity is stored according to the magnitude relation between the detected solar radiation intensity and the solar radiation intensity stored in the storage unit 68a. In addition, the coefficient is determined such that the response speed of the correction of the solar radiation intensity becomes slower as the outside air temperature approaches the reference temperature of the air conditioner. Then, the solar radiation intensity detected by the solar radiation sensor 63 is corrected based on the deviation between the stored solar radiation intensity and the detected solar radiation intensity, the set coefficient, and the stored solar radiation intensity. According to the second aspect of the present invention, different coefficient values are set for a plurality of air conditioning controls such as the air mix door opening control, the blower fan air volume control, and the outlet control. According to the invention described in claim 3, the correction is performed by the filter processing, and the coefficient is used as the coefficient of the filter processing.

Incidentally, in the section of means and action for solving the above-mentioned problems for explaining the constitution of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. It is not limited to.

[0009]

1 is a schematic configuration diagram of an embodiment of a vehicle air conditioner according to the present invention. In FIG. 1, reference numeral 1 denotes a variable displacement compressor that increases its inclination angle and discharge capacity when the suction pressure exceeds a set pressure. Compressor 1
Is driven and controlled by the engine 2, and its set pressure is controlled by the solenoid current supplied from the controller 68 shown in FIG. A constant-capacity compressor whose discharge capacity does not change may be used. 3 is a condenser for cooling and liquefying the high temperature gaseous refrigerant compressed by the compressor 1, 4 is a liquid tank, and 5 is an expansion valve.

Reference numeral 6 denotes an outside air introduction port 7a and an inside air introduction port 7b.
This is an evaporator that cools the air introduced into the air conditioning duct 8 from the. Reference numeral 9 denotes an inside / outside air switching door (intake door) that controls the flow rate of air introduced into the air conditioning duct 8 from the respective inlets 7a and 7b. A blower fan 10 ventilates the inside of the air conditioning duct 8 and rotates according to the driving force of the blower motor 11.

Reference numeral 12 is a heater core for warming the air cooled by the evaporator 6, and an air mix door 13 is provided between the heater core 12 and the evaporator 6. The air mix door 13 is controlled to open and close by an actuator (not shown), and adjusts the ratio of air passing through the heater core 12 and air bypassing the heater core 12. That is, the air cooled by the evaporator 6 is
Depending on the opening degree of the air mix door 13, a part of the air mix door 13 passes through the heater core 12 to be warmed, and the rest is heated by the heater core 1.
It bypasses 2 and is blown out with the cold wind.

The air that has passed through the air mix door 13 and the heater core 12 is introduced into the air mix chamber 14 to create conditioned air in which cold air and warm air are mixed.
The air mix chamber 14 has a ventilator outlet 15 that blows conditioned air toward the upper body of the occupant, and a foot outlet 16 that blows conditioned air toward the feet of the occupant.
A defroster outlet 17 that blows out conditioned air toward the windshield is installed, and a ventilator door 18 and a foot door 1 are provided in front of the outlets 15 to 17, respectively.
9 and a defroster door 20 are provided.

FIG. 2 is a block diagram showing a control system of the vehicle air conditioner of FIG. In FIG. 2, reference numeral 51 is a main switch for instructing start and stop of operation of the air conditioner, and 5
Reference numeral 2 is an auto switch for setting the automatic air conditioning mode.
Reference numeral 53 is an economy switch for setting a mode in which the compressor 1 is stopped to perform air conditioning (hereinafter referred to as economy mode), 54 is a fan switch for gradually changing the rotation speed of the blower fan, and 55 is for removing the fog on the windshield. It is a defrost switch for doing. 5
Reference numeral 6 denotes an outlet switch for switching the outlets, and each time the switch 56 is pressed, the vent outlet mode → bi-level outlet mode → foot outlet mode → defrost outlet mode → vent outlet mode is switched in this order. Reference numeral 57 is an inside air circulation switch for performing air conditioning by circulating inside air, 58 is an outside air introduction switch for introducing outside air to perform air conditioning, and 59 is a temperature setting device for setting the temperature inside the vehicle compartment.

Reference numeral 61 is an outside air temperature sensor for detecting the outside air temperature,
Reference numeral 62 denotes an inside air sensor for detecting the temperature inside the vehicle. 63
Is a solar radiation sensor that detects the amount of solar radiation, and is mounted, for example, near the differential grill on the passenger side. Reference numeral 64 is a suction temperature sensor (intake sensor) that detects an air temperature (hereinafter, referred to as suction temperature) Tint immediately after passing through the evaporator 6. Reference numeral 65 is a vehicle speed sensor that detects the traveling speed of the vehicle, 66 is a water temperature sensor that detects the cooling water temperature of the engine, and 67 is an opening sensor that detects the opening of the air mix door 13.

68 is a microcomputer and memory 6
8a, etc., which is a controller, and includes various switches 51 to 58, a setter 59, and various sensors 61 to 6
An air conditioning control program, which will be described later, is executed based on the input information from the compressor 7, the drive circuit 69 of the blower motor 11, the air mix door actuator 70.
Drive circuit 71, ventilator door actuator 7
2 drive circuit 73, foot door actuator 74 drive circuit 75, defroster door actuator 76 drive circuit 77, and intake door actuator 78 drive circuit 79. Reference numeral 80 denotes a display device that displays switch information and the like regarding the operated switch.

FIG. 3 is a flow chart showing an outline of the air conditioning control program executed by the controller 68. Less than,
The operation of this embodiment will be described based on this flowchart. The controller 68 is the main switch 5
The execution of this program is started when 1 is input.

In step S1 of FIG. 3, the room temperature set value Tpt is set.
c, inside temperature Tinc, outside temperature Tamb, suction temperature Tint, water temperature T
Initialize w, solar radiation Qsun, air mix door opening Xdsc, and various operation switches. In step S2,
Fail-safe processing such as backup is performed to deal with system malfunctions such as microcomputer runaway.

Next, in step S3, each sensor 61-
The value detected by 67 is fetched. Next, in step S4,
The outside air temperature Tamb detected by the outside air temperature sensor 61 is corrected. Normally, since the outside air temperature sensor 61 is attached to the radiator core support in the engine room, there is a risk that the detected value will suddenly rise due to the heat effect of the radiator during idling immediately after running, and in such a case, The outside air temperature is corrected so that the recognition temperature of the controller 68 slowly rises.

Next, in step S5, the solar radiation sensor 63
The solar radiation amount Qsun detected by is corrected. Details of the solar radiation sensor value processing in step S5 will be described later. Next, in step S6, the suction temperature detected by the suction temperature sensor 64 is corrected. The step S6 is provided, because the temperature of the surface of the evaporator 6 to which the suction temperature sensor 64 is attached has a predetermined temperature distribution, and therefore the detected temperature varies depending on the attachment position of the suction temperature sensor 64, so that it is corrected. This is because.

In step S7, the vehicle interior temperature detected by the inside air sensor 62 is corrected. By this correction processing, the temperature error caused by the mounting position of the inside air sensor 62 is corrected. In step S8, the room temperature set value set by the occupant with the temperature setting device 59 is corrected. For example,
When the outside air temperature Tamb is 20 ° C. or higher, the room temperature set value Tptc is lowered as the outside air temperature increases, and when the outside air temperature Ta is lower than 20 ° C., the room temperature set value Tpt decreases.
Increase ptc.

In step S9, as shown in the equation (1), the correction value T ^* ptc for the room temperature set value and the correction value T for the passenger compartment temperature are set.
^The target outlet temperature Xm is calculated based on ^* inc, the outside air temperature correction value T ^* am, and the solar radiation intensity correction value Q ^* sun, and the opening degree of the air mix door 13 is controlled based on the calculation result.

## EQU1 ## Xm = (A + D) × T ^* ptc + B × Tam + C × Q ^* sun−D × Tinc + E (where A to E are constants) ... (1)

Next, in step S10, the outlet is controlled. For example, when the automatic air conditioning mode is set, the opening degree of the air mix door 13 and the suction temperature sensor 6
The air outlet is set in consideration of the detected temperature of 4, the amount of solar radiation, and the like. On the other hand, when the outlet switch 56 is operated, the outlet is set based on the operation.

Next, in step S11, the compressor 1 is drive-controlled by the discharge capacity according to the set outlet, the outside air temperature, and the like. Next, in step S12, a signal is sent to the drive circuit 79 of the intake door actuator 78 to drive and control the intake doors 7a and 7b to selectively switch the outside air introduction port and the inside air introduction port. For example, when the compressor 1 is operating in the automatic air conditioning mode (when the REC switch is off), the outside air, the inside air, and the half outside air are selected according to the target outlet temperature Xm.

Next, in step S13, a signal is sent to the drive circuit 69 of the blower motor 11 to control the air volume of the blower fan 10 based on the target blowout temperature Xm calculated in step S9. Next, in step S14, a diagnostic program (not shown) is executed to perform self-diagnosis of the apparatus, and if there is an abnormality, a predetermined process is performed, and then the process returns to step S2 to repeat the above process.

FIG. 4 is a flow chart showing an interrupt process performed by the controller 68 when each of the switches 51 to 58 is operated. In step S51 of FIG. 4, the operating state of the controller 68 immediately before the interrupt processing is stored in the memory 68a. For example, controller 68
The value of the internal register is saved in the memory 68a. In step S52, the switch information of the operated switch is read.

In step S53, the display of the display device 80 is switched according to the switch information of the operated switch, and the processing according to the operated switch information is performed.
In step S54, the information saved in the memory 68a in step S51 is returned to the register or the like, and then the process returns.

FIG. 5 is a detailed flowchart of the solar radiation sensor value processing in step S5 of FIG. Step S of FIG.
At 101, the measured value Qsun of the solar radiation intensity detected by the solar radiation sensor 63 is fetched. In step S102,
It is determined whether or not the measured value Qsun of the solar radiation intensity is a value equal to or greater than the previous calculated value Q ^* sun1 (t-1) stored in the memory 68a. When the determination is affirmative, the process proceeds to step S103, and the time constant a1 is substituted into the coefficient tQ1 used for the first-order lag filter processing. On the other hand, if the determination in step S102 is negative, the process proceeds to step S104, and the time constant b1 (where a1 <b1) is substituted into the coefficient tQ1.

When the processes of steps S103 and S104 are completed, the process proceeds to step S105, where the first-order lag filter process is performed on the measured value Qsun of the solar radiation intensity based on the equation (2) to calculate the calculated value of solar radiation intensity Q ^* sun1. Ask for. In addition, when the process of step S105 is performed for the first time, the memory 6
When the previous calculated value Q ^* sun (t-1) is not stored in 8a, the measured value Qsun of the solar radiation intensity is set to the calculated value Q ^* sun1 of the solar radiation intensity.

[Formula 2] Q ^* sun1 = Q ^* sun1 (t−1) + (1 / tQ1) × {Qsun−Q ^* sun1 (t−1)} (2)

The constants a1 and b1 described above are values that change depending on the outside air temperature as shown in FIG. 6, and both a1 and b1 decrease with a peak near the reference temperature of the air conditioner (for example, 25 ° C.). The smaller the values of these constants a1 and b1, the more
As shown in the equation (2), the calculated value Q ^* sun1 becomes smaller.

Thus, the constants a1 and b depend on the outside temperature.
The reason for changing the value of 1 is to change the response speed of the solar radiation intensity according to the outside air temperature. Specifically, the closer the outside air temperature is to the reference temperature of the air conditioner (for example, 25 ° C.), the slower the response speed becomes. To prevent passengers from feeling uncomfortable.

In step S106, step S105
Store the calculated value Q ^* sun1 in the memory 68a. That is, the previous calculated value Q ^* sun stored in the memory 68a
Replace 1 (t-1) with the current calculated value Q ^* sun1.

The calculated value Q ^* sun1 calculated by the above-described steps S101 to S106 is used, for example, to control the opening degree of the air mix door 13 in step S9 of FIG.

Next, in step S107, it is determined whether or not the measured value Qsun of the solar radiation intensity is equal to or greater than the previous calculated value Q ^* sun2 stored in the memory 68a. If the determination is affirmative, the process proceeds to step S108, and the constant a2 is substituted into the coefficient tQ2 used for the first-order lag filter process. on the other hand,
If the determination in step S107 is negative, step S10
9, the coefficient tQ2 is set to the constant b2 (where a2 <b
Substitute 2).

When the process of step S108 or S109 is completed, the process proceeds to step S110, and the first-order lag filter process is performed on the measured value of the solar radiation intensity Qsun based on the equation (3) to obtain the calculated value of solar radiation intensity Q ^* sun2. Ask.

[Formula 3] Q ^* sun2 = Q ^* sun2 (t-1) + (1 / tQ2) * {Qsun-Q ^* sun2 (t-1)} (3)

In step S111, step S110
The calculated value Q ^* sun2 of is stored in the memory 68a.

The calculated value Q ^* sun2 calculated by the above steps S107 to S111 is used, for example, for the outlet control in step S10 and the air volume control in step S13 in FIG.

As described above, in the solar radiation sensor value processing of FIG. 5, the coefficient tQ for performing the first-order lag filter processing on the actual measurement value Qsun of the solar radiation amount by the solar radiation sensor 63 is calculated as the previous calculation value Q ^* of the solar radiation amount ^. It is determined by sun and the outside air temperature Tamb, and the coefficient tQ is used to perform the primary delay processing to obtain the correction calculation value Q ^* sun of the solar radiation amount.

As described above, the response speed of the calculated value of the solar radiation intensity can be adjusted so as to match the sense of human skin even if the measured value of the solar radiation intensity changes abruptly. Further, since the calculated value of the solar radiation intensity is corrected separately for each individual air conditioning control such as the opening control of the air mix door 13 and the air volume control, a more comfortable air conditioning control becomes possible.

For example, FIG. 7 (b) is a diagram showing a change in the opening degree of the air mix door 13 when the measured value of the solar radiation intensity changes as shown in FIG. 7 (a). As shown in the figure, when the solar radiation intensity increases rapidly, the opening degree of the air mix door 13 is changed to a relatively high speed in the closing direction. On the other hand, when the solar radiation intensity sharply decreases, the opening degree of the air mix door 13 is changed at a slow speed in the opening direction. As described above, the opening degree of the air mix door 13 can be changed so as to match the human sense of skin shown by the one-dot chain line in FIG.

In the above embodiment, the example in which the coefficient tQ used in the first-order lag filter process is changed according to the outside air temperature as shown in FIG. 6 has been described. However, in order to simplify the process, the coefficient tQ is changed.
Q may be constant regardless of the outside temperature. In the above-described embodiment, the calculated value of the solar radiation intensity used for controlling the opening degree of the air mix door 13 and the calculated value of the solar radiation intensity used for the outlet control and the air volume control are different, but each control is performed by the same calculated value. You may go. Conversely, the calculation value used for the outlet control and the calculation value used for the air volume control may be different. Further, a calculated value may be provided separately for air conditioning control other than the above three controls.

In the embodiment constructed as described above, the controller 68 serves as the control means and performs step S10 of FIG.
5, S110 is the correcting means, the memory 68a is the storing means, and steps S102 to S104 and step S1 in FIG.
07 to S109 respectively correspond to the coefficient setting means.

[0042]

As described in detail above, according to the present invention, the air conditioning control is performed after the solar radiation intensity is corrected based on the amount and direction of change of the solar radiation intensity. The temperature and air volume can be changed to suit the conditions, and comfortable air conditioning control can be performed. That is, since the air conditioning control is performed in consideration of the delay in the sense of the human skin with respect to the change in the solar radiation intensity, the occupant does not feel uncomfortable. Further, the deviation between the correction value of the past insolation intensity stored in the storage means and the detected value of the current insolation intensity is calculated, and the insolation intensity is corrected based on this deviation. The air conditioning control can be performed in consideration of the above. Further, the coefficient for correcting the solar radiation intensity detected by the solar radiation sensor 63 is determined by the magnitude relationship between the solar radiation intensity detected by the solar radiation sensor 63 and the solar radiation intensity stored in the storage unit, and the outside temperature is Since the response speed of the correction of solar radiation intensity becomes slower as it approaches the reference temperature of the air conditioner, the coefficient value can be changed based on the amount and direction of change of solar radiation intensity, and more practical correction processing can be performed. In addition, the air conditioning control can be performed in consideration of the difference in the sense of human skin due to the change of the outside temperature. According to the second aspect of the present invention, the coefficient of the filter processing means can be changed according to the environment, so the accuracy of the first-order lag filter processing is improved.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a control system of the vehicle air conditioner of the present embodiment.

FIG. 3 is a flowchart showing an outline of an air conditioning control program executed by a controller.

FIG. 4 is a flowchart showing interrupt processing performed by a controller.

FIG. 5 is a detailed flowchart of solar radiation sensor value processing in step S5 of FIG.

FIG. 6 is a diagram showing changes in coefficients a1, b1, a2 and b2 depending on the outside air temperature.

FIG. 7 (a) is a diagram showing a temporal change in solar radiation intensity,
(B) is a figure which shows the time change of the opening degree of an air mixing door.

[Explanation of symbols]

1 compressor 6 evaporator 7a Outside air inlet 7b Inside air inlet 8 air conditioning duct 9 Inside / outside air switching door 10 Blower Fan 11 Blower motor 12 heater core 13 Air mix door 61 Outside temperature sensor 62 Inside air sensor 63 solar radiation sensor 68 Controller

Continuation of front page (56) Reference JP-A-2-155823 (JP, A) Actual development Sho 63-169307 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60H 1 / 00-3/06

Claims (2)

(57) [Claims] 1. A vehicle air conditioner comprising a solar radiation sensor for detecting the solar radiation intensity and a control means for performing air conditioning control based on the detected solar radiation intensity, comprising: a change amount and a change of the detected solar radiation intensity. A correction unit that corrects the detected solar radiation intensity based on a direction; the correction unit stores the corrected solar radiation intensity; and the detected solar radiation intensity and the stored solar radiation intensity. And a coefficient setting means for setting the coefficient so that the response speed of the correction of the solar radiation intensity becomes slower as the outside air temperature becomes closer to the reference temperature of the air conditioner. Having, the deviation between the stored solar radiation intensity and the detected solar radiation intensity, the set coefficient, and based on the stored solar radiation intensity, correct the detected solar radiation intensity, Serial control means, the air when the detected value of the solar irradiance is increased
Rotate the mix door to the closed side to reduce the amount of reheat.
When the detected value of solar radiation intensity decreases, the air mix door
Rotate to the open side to increase the amount of reheat,
The rotation speed on the closing side will be faster than the rotation speed on the opening side.
Air mixed on the basis of the intensity of solar radiation that is Uni the modified
(A) An air conditioner for a vehicle, which controls the opening degree of the vehicle. 2. The vehicle air conditioner according to claim 1 , wherein the correction means includes a filter processing means, and a coefficient of the filter processing means is set by the coefficient setting means. .