JP2730350B2 - 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 a vehicle air conditioner which controls air conditioning based on the amount of solar radiation and can set a differential mode.

[0002]

2. Description of the Related Art There is known an air conditioner for a vehicle which detects a vehicle heat load including an amount of solar radiation and performs air conditioning control (for example, blow-off temperature control, blower fan air volume control, outlet control) based on the detection result. (For example, Nissan Motor Publishing Service Bulletin No. 578 (June 1987)). Generally, in this type of air conditioner, a differential mode can be set by operating a manual switch, and when the differential mode is set, dehumidified air is blown from a defroster outlet to a window glass,
Remove window fogging. Further, there is also known a device capable of automatically setting such a differential mode. In this method, a humidity sensor is used, and when the detection value is equal to or more than a predetermined value, it is determined that the window glass is easily clouded, and the differential mode is automatically set. As a result, the fogging of the window can be removed without the occupant having to perform the manual operation each time.

[0003]

However, the above humidity sensor has a problem that its structure is complicated and expensive, and its processing circuit is also complicated.

An object of the present invention is to provide a vehicle air conditioner capable of automatically setting a differential mode with a simple configuration.

[0005]

Means for Solving the Problems When described in association with FIG. 1 (a) which is a claim correspondence diagram, the invention of claim 1 is as follows.
While performing air conditioning control based on the detected solar radiation,
First defroster outlet 101 to remove window fog
The present invention is applied to a vehicle air conditioner that can set a differential mode in which air is blown toward a window glass WG from a vehicle. The predetermined area E of the window glass WG is set regardless of whether the differential mode is set.
A second defroster outlet 102 for constantly blowing air to R
A first solar radiation sensor 103 for detecting an amount of solar radiation entering the vehicle interior through an area other than the predetermined area ER of the window glass WG; and a first solar radiation sensor 103 entering the vehicle interior through a predetermined area ER of the window glass WG. Second solar radiation sensor 10 for detecting the amount of solar radiation
Determining means 105 for determining whether or not the difference between the amount of solar radiation detected by the second solar radiation sensor 104 and the amount of solar radiation detected by the first solar radiation sensor exceeds a predetermined value;
A mode setting unit for setting a differential mode when the difference in the amount of solar radiation exceeds a predetermined value, thereby solving the above problem. 1B, an air conditioning control is performed based on the amount of solar radiation, and a differential mode in which air is blown from a defroster outlet toward a window glass to remove window fogging is set. Applicable to possible vehicle air conditioners. Then, the first solar radiation sensor 103 'provided inside the vehicle interior, the second solar radiation sensor 104' provided outside the vehicle interior, the amount of solar radiation detected by the second solar radiation sensor 104 'and the first solar radiation A determining means 105 'for determining whether or not the difference from the amount of solar radiation detected by the sensor 103' exceeds a predetermined value; and a mode for setting a differential mode when it is determined that the difference between the amounts of solar radiation exceeds a predetermined value. Setting means 106 'to solve the above problem.

[0006]

[Action]

(1) Since air is constantly blown from the second defroster outlet 102 to the predetermined area ER of the window glass WG regardless of the setting of the differential mode, the predetermined area ER is always foggy. Has been removed. Therefore, the second solar radiation sensor 1 for detecting the amount of solar radiation passing through the predetermined region ER
The fact that the difference between the output of the first solar radiation sensor 103 and the output of the first solar radiation sensor 103 for detecting the amount of solar radiation passing outside the predetermined area ER is equal to or greater than a predetermined value indicates that the window is fogged. I have. Therefore, the mode setting means 106 sets the differential mode when such a state is determined. Thus, the differential mode can be automatically set without using the humidity sensor. (2) Invention of Claim 2 Since the second solar radiation sensor 104 'is provided outside the vehicle compartment, its detection value is not affected at all by window fogging. on the other hand,
Since the first solar radiation sensor 103 'is provided in the vehicle interior, its detection value is affected by the presence or absence of window fogging. Therefore, the fact that the difference between the output of the second solar radiation sensor 104 'and the output of the first solar radiation sensor 103' is equal to or greater than a predetermined value indicates that window fogging has occurred. Therefore, the mode setting means 106 sets the differential mode when such a state is determined. Thereby, the same effect as described above can be obtained.

[0007]

An embodiment of the present invention will be described with reference to FIGS. FIG. 2A is a perspective view showing an external appearance of a vehicle air conditioner according to the present invention, and FIG. 2B is an internal configuration diagram thereof. 1
0 is a blower unit that houses the blower fan 1, 20 is a cooling unit that houses the evaporator 2, 30 is a heater unit that houses the heater core 3 and the air mix door 4, and the units 10 to 30 are connected to each other. I have. The outside air is introduced into the blower unit 10 from the outside air inlet 11 or the air inside the vehicle is introduced from the inside air inlet 12 in accordance with the opening degree of the intake door 8. Is blower fan 1
Evaporator 2, air mix door 4 and heat sink
The air passes through the tacho 3 and is blown into the passenger compartment from the outlets 31 to 33. 31 is a vent outlet, 32 is a foot outlet, 33
Denotes a first defroster outlet, and the outlet is selected by a vent door 5, a foot door 6, and a defroster door 7.

In this embodiment, the outside air is always blown from the second defroster outlet 14 through the duct 13 from the vicinity of the outside air inlet 11. Here, the first defroster outlet 33 and the second defroster outlet 14 are provided below the windshield FG in the vehicle interior, as shown in FIG. 3 which is a plan view of the vehicle. The region ER of the windshield FG indicated by the two-dot chain line is always free from fogging by the air constantly blown out from the second defroster outlet 14. 45a and 45b are first and second insolation sensors provided near the first and second defroster outlets 33 and 14, respectively. The first insolation sensor 45a is located outside the region ER of the windshield FG. , The amount of solar radiation Qsun1 incident on the vehicle interior through the area is detected. The second solar radiation sensor 45b detects the amount of solar radiation Qsun2 that enters the vehicle interior via the above-mentioned region ER of the windshield FG. Here, when fogging occurs on the windshield FG, the sunshine is blocked by the fogging.
Becomes smaller. On the other hand, Qsun2 is not affected at all by the amount of haze other than the area ER.

FIG. 4 is a block diagram showing a control system of the air conditioner. A control circuit (hereinafter, simply referred to as a CPU) 41 including a CPU, a ROM, a RAM, etc., is connected via an input circuit 42 to an outside air temperature sensor 43 for detecting an outside air temperature Tamb, and an indoor temperature for detecting a vehicle interior temperature Tinc. Sensor 4
4, first and second insolation sensors 45a and 45b for detecting the insolation amounts Qsun1 and Qsun2, respectively, are connected, and various kinds of temperature information and heat amount information are input to the CPU 41 from these sensors.

Further, the input circuit 42 is connected to an air volume setting switch 51, an air outlet selection switch 52, a REC switch 53, an air conditioner switch 54, and a differential switch 55 provided on a control panel of a driver's seat.
The air volume setting switch 51 is a switch for manually commanding the blower fan air volume. The outlet selection switch 52 is a switch for instructing the selection of the outlet.
The REC switch 53 is a switch that commands the inside air circulation. The air conditioner switch 54 is a switch that commands the operation of the compressor 68. The differential switch 55 is a switch for instructing a setting of a differential mode described later.

An air mix door actuator 61, a vent door actuator 62, a foot door actuator 63, a defroster door actuator 64, an intake door actuator 65, and a blower fan control circuit 66 are connected to the CPU 41 via an output circuit 49. A motor (blower fan motor) 1a for driving the blower fan 1 is connected to the fan control circuit 66. The blower fan motor 1a rotates at a speed according to the voltage applied from the blower fan control circuit 66, and blows an air volume according to the rotation speed into the vehicle interior. The output circuit 49 further includes a compressor 68 via a relay 67.
Is connected.

Next, the procedure of the air-conditioning control executed by the CPU 41 will be described with reference to the flowcharts of FIGS.
FIG. 5 is a main flowchart.
Initial setting is performed at 10, and in a normal auto air conditioner mode, for example, the set temperature Tptc is initially set to 25 ° C. In step S20, various information from each sensor is input. The data information of these sensors will be specifically described. The set temperature Tptc is obtained from a control panel (not shown), the vehicle interior temperature Tinc is obtained from the indoor temperature sensor 44, the outside air temperature Tamb is obtained from the outside air temperature sensor 43, and the amount of solar radiation Qsun1,
Qsun2 is provided from the first and second solar radiation sensors 45a and 45b, respectively.

Next, at step S30, the outside air temperature sensor 4
The outside temperature Tamb obtained from step 3 is processed to a value Tam corresponding to the actual outside temperature, excluding the influence from other heat sources. In step S40, as will be described in detail later, the amount of solar radiation Qsun1, from the first and second solar radiation sensors 45a, 45b
Process Qsun2 to Q'sun. In step S50, the set temperature Tptc set on the control panel is processed to a value T'ptc corrected according to the outside air temperature. Step S60
Then, from T'ptc, Tinc, Tam, and Q'sun, the target outlet temperature Xm is calculated from Xm = (A + D) T'ptc + B.Tam + C.Q'sun-D.Tinc + E (where A to E are constants). At the same time, the opening of the air mix door 4 is controlled in accordance with the target opening Xm. The blowout temperature is determined by this air mix door opening control.

In step S70, the actuators 62,
The vent door 5, foot door 6, and defroster door 7 are driven by 63 and 64 to control each outlet. Step S
At 80, the blower fan air volume is controlled by controlling the voltage applied to the blower fan motor 9a. In step S90, the compressor 68 is controlled. In step S100, the intake door 8 is driven by the intake door actuator 65 to perform suction port control, that is, control of switching between outside air introduction and inside air circulation. Thereafter, the process returns to step S20.

FIG. 6 shows details of the solar radiation sensor processing in step S40. First, in step S41, the solar radiation amounts Qsun1 and Qsun2 are compared. If Qsun1> Qsun2, Qsun = Qsun1 is set in step S42, and Qsun1 ≦
If it is Qsun2, then in step S43 Qsun2-Qsun1>
It is determined whether it is K. If Qsun2−Qsun1 ≦ K, at step S44 Qsun = (Qsun1 + Qsun2) /
2, if Qsun2−Qsun1> K, that is, Qsu
If the difference between n2 and Qsun1 exceeds a predetermined value, Qsun = Qsun2 is set in step S45. Next, step S46
Then, the insolation Qsun as the light amount is processed into a value Q'sun as the heat amount suitable for the subsequent conversion, and the process returns to the processing in FIG. Here, FIG. 12 shows the solar radiation amounts Qsun1, Qsun2 and Qsun.
An example of the change over time of the sun is shown.
The broken line indicates Qsun2, and the one-dot chain line indicates Qsun. According to the procedure of FIG. 6, Qsun = Qsun1 when Qsun1> Qsun2, and Qsun2−Qsun when Qsun1 ≦ Qsun2, as indicated by regions A and C.
If 1 ≦ K, Qsun = (Qsun1 +
Qsun2) / 2, and if Qsun2-Qsun1> K, then Qsun = Qsun2.

FIG. 7 shows details of the outlet control in step S70 (FIG. 5). In FIG. 7, it is first determined in step S701 whether or not the outlet selection switch 52 or the differential switch 55 is operated, and if affirmative, the outlet is determined in step S702 according to the operation. Although the details are omitted, for example, the differential switch 55
Is turned on, the first defroster outlet 33 is selected so that air is blown out from the outlet. If step S701 is denied, the process proceeds to step S703, and
It is determined whether the Todef flag ADF is set to 1. If it is not set, the process proceeds to step S704, and it is determined whether or not Qsun2−Qsun1> K. If the result is negative, the process proceeds to step S718 in FIG. In step S718, a timer to be described later is stopped, and in step S719, the timer is reset and the process proceeds to step S720.
Proceed to. In step S720, the above step S60
The outlet is selected in accordance with the target outlet temperature Xm obtained in (FIG. 5), and thereafter, the process returns to the processing of FIG.

On the other hand, if step S704 is affirmed, that is, if the difference between Qsun2 and Qsun1 exceeds a predetermined value K, the process proceeds to step S705 to determine whether or not the timer is operating. If it is operating, the process proceeds to step S707. If it is not operating, the timer is started in step S706, and the process proceeds to step S707. Step S707
Then, it is determined whether three seconds have elapsed from the start of the timer. If not, the process proceeds to step S720 in FIG. 8, and if it has elapsed, the process proceeds to step S708. In step S708, it is determined whether the flag F is 1 or not. If it is 1, the process proceeds to step S711.
Go to 09. In step S709, the amount of solar radiation Qsun1,
Qsun2 is detected, and using this, α (3) is obtained from α (3) = Qsun2− (Qsun1 + K) (where K is a constant), and the process proceeds to step S710. In step S710, the flag F is set to 1 and the process proceeds to step S711.

In step S711, it is determined whether or not 5 seconds have elapsed since the start of the timer. If not, the process proceeds to step S720 in FIG.
In step 2, the flag F is set to 0, and the amount of solar radiation Q at that time is set.
sun1 and Qsun2 are detected, respectively, and using these, α (5) is obtained from α (5) = Qsun2− (Qsun1 + K), and the flow advances to step S713.

In step S713, α (3) and α
(5) That is, α after 3 seconds from the timer start and α after 5 seconds are compared. If α (3)> α (5), the process proceeds to step S718 in FIG. 8 and α (3) ≦ If α (5), the process proceeds to step S714. In step S714,
The auto differential flag ADF is set to 1, and then in step S715, the first defroster outlet 33 is selected, and the flow advances to step S716. In step S716, the timer is stopped. Subsequently, in step S717, the timer is reset, and the process returns to the processing in FIG. Here, in this embodiment, setting the auto differential flag ADF from 0 to 1 corresponds to the setting of the differential mode.

On the other hand, if it is determined that the auto differential flag ADF is set to 1, the process proceeds to step S721 in FIG. Step S721
Then, it is determined whether or not Qsun1 = Qsun2. If the result is affirmative, the process proceeds to step S715 in FIG. 7. If the result is affirmative, the auto differential flag ADF is reset to zero in step S722, and the process proceeds to step S720.

According to the above outlet control, Qsun2-Qs
When un1 ≦ K, normal outlet control is performed in step S720, that is, control for automatically selecting the outlet based on the target outlet temperature Xm. On the other hand, when Qsun2−Qsun1> K, timing is started from that point, and α
(3) = Qsun2- (Qsun1 + K) becomes α after 5 seconds
(5) = Qsun2- (Qsun1 + K) is obtained, and when α (3) ≦ α (5), the auto differential flag A
DF is set to 1 and the differential mode is set.

Here, as described above, Qsun2 is the amount of solar radiation incident on the vehicle interior through the region ER of the windshield FG (having fog removed), and Qsun1 is the region other than the region ER (having fog). (Which may occur) into the vehicle interior, and Qsun1 decreases as the amount of cloud increases, but Qsun2 is not affected by the amount of cloudiness other than the region ER. From this, Qsun
The fact that 2-Qsun1> K indicates that the amount of haze other than the area ER has become equal to or more than a predetermined amount, and that after 5 seconds, α (3) ≦ α (5) That is, the amount of fogging does not decrease even after a lapse of time. Therefore, in this case, the differential mode is set, and the defroster outlet is selected in the same manner as when the differential switch 55 is turned on. After setting the differential mode,
When n1 = Qsun2, the auto differential flag ADF becomes 0, the differential mode is released, and the state returns to the state before the differential mode was set.

FIG. 9 shows a detailed procedure of the air volume control in step S80 (FIG. 5). In FIG. 9, first, in step S81, it is determined whether or not the air volume setting switch 51 has been operated.
At 82, a voltage corresponding to the operation is supplied to the blower fan motor 1a.
To the blower fan 1 with the air flow according to the applied voltage.
Drive. On the other hand, if the air volume setting switch 51 has not been operated, the process proceeds to step S83, where an applied voltage is obtained based on the target outlet temperature Xm and applied to the blower fan motor 1a to drive the blower fan 1. Although the details are omitted, for example, during cooling, the blower fan airflow is increased as the target outlet temperature Xm is lower.

FIG. 10 shows the detailed procedure of the compressor control in step S90 (FIG. 5). In FIG. 9, it is first determined in step S91 whether or not the blower fan 1 is operating.
At 92, the compressor 68 is turned off. If the blower fan 1 is operating, it is determined in step S93 whether the differential switch 55 is on or off.
The compressor 68 is operated at 94, and if it is off, the process proceeds to step S95. In step S95, it is determined whether or not the auto differential flag ADF is set to 1.
If it is set, the process proceeds to step S94, and if it is not set, the process proceeds to step S96. In step S96, it is determined whether or not the air conditioner switch 54 is on. If the air conditioner switch 54 is off, the process proceeds to step S92;
Proceed to.

FIG. 11 shows a step S100 (FIG. 5).
3 shows the procedure of suction port control. In FIG. 11, the on / off state of the differential switch 55 is determined in step S101. If it is on, outside air introduction is selected in step S102. If it is off, the flow proceeds to step S103. Step S
At 103, it is determined whether or not the auto differential flag ADF is set to 1. If the determination is affirmative, the process proceeds to step S102, and if the determination is negative, the process proceeds to step S104. Step S
At 104, the on / off of the REC switch 53 is determined,
If it is on, the inside air circulation is selected in step S105, and if it is off, the process proceeds to step S106. Step S106
Then, one of the outside air introduction and the inside air circulation is selected based on the target outlet temperature Xm.

The above is the procedure of the air conditioning control by the CPU 41. According to this procedure, the auto differential flag ADF
Is set to 1, that is, when the differential mode is set, the following control is performed. FIG.
3 is an outlet for a change in the amount of solar radiation Qsun1, Qsun2,
This shows changes in the suction port, blower fan air volume, and air mix door opening, and it is assumed that the differential mode has been set at time t1. When the differential mode is set, the first defroster outlet 33 is selected (FIG. 13B), and the introduction of outside air is selected (FIG. 13C). Further, while the compressor 68 is turned on, the blower fan air volume maintains the state before the setting of the differential mode (FIG. 13).
(D)).

Here, the differential mode is set in Qsu
Since n2−Qsun1> K, at this time, according to the processing of FIG. 9, the amount of solar radiation Qsun becomes Qsun2 (> Qsun1), and the target blowing is performed using the processing value Q′sun of the amount of solar radiation Qsun. The temperature Xm is calculated, and the blower fan air volume is controlled based on the target outlet temperature Xm. At this time, in the case where only the first solar radiation sensor 45a is provided as in the conventional air conditioner, only Qsun1 is obtained.
When the window fogging occurs, the value becomes smaller than the value corresponding to the actual amount of solar radiation. Therefore, when Qsun1 is used, the target blowing temperature Xm rises, and the blower fan air volume increases as shown by the broken line in FIG. Will rise. On the other hand, in this embodiment, Qsun2 which is not affected by window fogging is used as Qsun, so that the target blowing temperature Xm does not increase and the air volume of the blower fan does not increase.

Further, when the differential mode is set, FIG.
As shown by a broken line, the air mix door opening also maintains the previous state. Here, in the case where only the first solar radiation sensor 45a is provided, as described above, the value of Qsun1 is affected by the fogging of the window, and its value becomes small. Therefore, when Qsun1 is used, the target outlet temperature Xm increases. As shown by the broken line in FIG. 13 (e), the opening of the air mix door is on the hot side, and the blowing temperature is reduced. On the other hand, in this embodiment, Qsun
Since Qsun2 which is not affected by window fogging is used, the air mixing door opening degree is maintained at the previous state, and the rise of the blow-out temperature can be prevented.

Further, in this embodiment, as shown in FIG. 12, Qsun is obtained from Qsun1 and Qsun2, and air-conditioning control is performed based on this Qsun, so that accurate solar radiation can be obtained even when the differential mode is not set. Based on this, it is possible to accurately control the outlet temperature, the outlet, and the blower fan air volume.

In the configuration of the above embodiment, the CPU 41
Constitute the determination means 105 and the mode setting means 106, respectively.

The first defroster outlet 33 and the second
The arrangement position of the defroster outlet 14 is not limited to the embodiment, and the positions of the first and second solar radiation sensors 45a, 45b can be changed according to the arrangement position of the defroster outlets 33, 14. In the above, Qsun2-Qsun1> K
Is determined, timing is started from that point, and the above α
Although the differential mode is set when (3) ≦ α (5), the differential mode may be set when, for example, Qsun2−Qsun1> K is determined.

In the above description, the second solar radiation sensor 45b is provided at a position for detecting the solar radiation from the region ER from which the window fogging has been constantly removed. For example, as shown in FIG. It may be provided outside the vehicle compartment. According to this, even if the second defroster outlet 14 is not provided, the detection value of the second solar radiation sensor 14 is not affected by the fogging of the window, so that the same operation and effect as described above can be obtained.

[0033]

According to the first aspect of the present invention, the first solar radiation sensor for detecting the amount of solar radiation entering through the normal region of the window glass and the vehicle interior through the region of the window glass where air is constantly blown are provided. The differential mode is automatically set when the output difference from the second solar radiation sensor that detects the amount of incident solar radiation exceeds a predetermined value. Therefore, one solar radiation sensor used for normal air conditioning control is provided. The differential mode can be automatically set without using a humidity sensor simply by adding the sensor, thereby simplifying the configuration and reducing the cost. Further, by using the second solar radiation sensor capable of detecting the amount of solar radiation without being affected by window fogging,
The effect that the air conditioning control in the differential mode can be performed accurately can also be obtained. According to the second aspect of the present invention, the first solar radiation sensor provided inside the vehicle compartment and the second solar radiation sensor provided outside the vehicle compartment are provided, and the same control as described above is performed based on the outputs thereof. As a result, the same effect as described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to claims.

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

FIG. 3 is a plan view of a vehicle for explaining a mounting position of a solar radiation sensor.

FIG. 4 is a block diagram of a control system.

FIG. 5 is a main flowchart for explaining the operation of the embodiment.

FIG. 6 is a subroutine flowchart showing details of solar radiation sensor processing.

FIG. 7 is a subroutine flowchart showing details of outlet control;

FIG. 8 is a flowchart following FIG. 7;

FIG. 9 is a subroutine flowchart showing details of air volume control.

FIG. 10 is a subroutine flowchart showing details of compressor control.

FIG. 11 is a subroutine flowchart showing details of suction port control.

FIG. 12 is a time chart showing Qsun with respect to solar radiation amounts Qsun1 and Qsun2.

FIG. 13 is a time chart showing changes in the air outlet, the air inlet, the blower fan airflow, and the air mix door opening with respect to changes in the amount of solar radiation.

FIG. 14 is a view showing a mounting position of a solar radiation sensor in another embodiment.

[Explanation of symbols]

 Reference Signs List 1 blower fan 2 evaporator 3 heater core 4 air mix door 8 intake door 14, 102 second defroster outlet 33, 101 first defroster outlet 41 CPU 45a, 103, 103 'first solar radiation sensor 45b, 104 , 104 'Second solar radiation sensor 68 Compressor 105, 105' Judging means 106, 106 'Mode setting means

Claims (2)

(57) [Claims] 1. A vehicle air conditioner that performs air conditioning control based on a detected amount of solar radiation and that can set a differential mode in which air is blown from a first defroster outlet toward a window glass in order to remove window fogging. The second defroster outlet that constantly blows air to a predetermined area of the window glass regardless of the setting of the differential mode, and enters the vehicle cabin through an area other than the predetermined area of the window glass. A first solar radiation sensor for detecting the amount of solar radiation, a second solar radiation sensor for detecting the amount of solar radiation entering the vehicle interior through the predetermined area of the window glass, and a second solar radiation sensor for detecting the solar radiation. Solar radiation and the first
Determining means for determining whether or not the difference from the amount of solar radiation detected by the solar radiation sensor exceeds a predetermined value; and setting the differential mode when it is determined that the difference between the amounts of solar radiation exceeds a predetermined value. And a vehicle air conditioner. 2. A vehicular air conditioner capable of performing a differential mode in which air conditioning is controlled based on a detected amount of solar radiation and air is blown from a defroster outlet toward a window glass in order to remove window fog. A first solar radiation sensor provided indoors, a second solar radiation sensor provided outside the vehicle interior, an amount of solar radiation detected by the second solar radiation sensor, and a first
Determining means for determining whether or not the difference from the amount of solar radiation detected by the solar radiation sensor exceeds a predetermined value; and setting the differential mode when it is determined that the difference between the amounts of solar radiation exceeds a predetermined value. And a vehicle air conditioner.