JP2646493B2 - Auto air conditioner - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile air conditioner, and more particularly to a storage unit for various information.

[Conventional technology]

Conventionally, a controller for controlling an auto air conditioner of an automobile includes an inside air temperature at the time of starting the auto air conditioner,
Input values of each sensor that detects the outside air temperature, solar radiation, cooling water temperature, etc., error information such as short-circuit and open of each sensor, control state of actuators and blower fans that switch between inside and outside air, vehicle interior set temperature, etc. A RAM is provided for storing information when the automatic air conditioner is operating, and is used for control during the operation of the automatic air conditioner.

At this time, when the ignition switch of the automobile is turned off, the power of the controller is turned off, and the information stored in the RAM disappears.

However, if the information of the RAM stored during the operation of the auto air conditioner, especially the set temperature, etc., is stored until the next time the ignition switch is turned on and the engine is restarted, the operation of the auto air conditioner can be efficiently performed and the operation of the auto air conditioner can be efficiently performed. User operation can be reduced.

Therefore, even when the ignition switch is turned off
In order to retain the information of the RAM, a method of continuously supplying power to the CPU with a battery or the like has been considered.

[Problems to be solved by the invention]

However, with the ignition switch turned off, the CPU
If power is continuously supplied to the battery, there is little problem if the time until the next start of the engine is short, but if left for a long time, there is a problem that the battery runs out.

An object of the present invention is to provide an automatic air conditioner that can store information even when the power is turned off for a long time.

[Means for solving the problem]

The present invention is characterized in that an actuator used for an auto air conditioner is used as a storage medium for information, and includes an actuator, control means for controlling the actuator, and storage means for storing predetermined information,
The control unit drives the actuator to a position corresponding to different information that is not directly related to the control position at the time of operation of the actuator stored in the storage unit when the power of the auto air conditioner is turned off, and Wherein the information corresponding to the position of the actuator is stored in the storage means when the power is turned on.

[Action]

In the present invention, when the power supply of the auto air conditioner is turned off, the control unit such as the CPU uses the backup power supply or the like to store the predetermined information stored in the storage unit such as the RAM, for example, the in-vehicle setting. The temperature and the like are converted into actuator position data, and the actuator is driven in accordance with the position data, and predetermined information is replaced with the displacement of the actuator. After that, the power supply of the auto air conditioner is completely cut off.

When the power of the auto air conditioner is turned off, the information stored in the storage means such as the RAM disappears. Also, since no power is supplied to the control means, the actuator is held at the moved position.

When the power supply of the auto air conditioner is turned on again, the control means detects the position of the actuator, and further outputs the position data of the actuator, contrary to the case of the power off,
The information is converted into predetermined information and stored in the storage means.

Thereafter, the control means performs normal air conditioner control using this information.

(Example of the invention)

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a configuration diagram of an automatic air conditioner. The air conditioner 1 is provided with an air conditioning duct 2, and the air conditioning duct 2 is formed with an inside air inlet 3 and an outside air inlet 4. A motor-type internal / external air actuator 6 with a built-in potentiometer to which an internal / external air switching damper 5 is attached is provided at a branch portion between the internal air introduction port 3 and the external air introduction hole 4.

The inside / outside air actuator 6 is controlled by the controller 30 to adjust the ratio of inside air and outside air introduced into the air conditioning duct 2 and the switching between inside and outside air.

An evaporator 8 connected to a cooling cycle such as a compressor 7 and a condenser (not shown) is provided downstream of the inside / outside air actuator 6 in the air conditioning duct 2. The air introduced into the air conditioning duct 2 is cooled and dehumidified by the evaporator 8. The operation of the compressor 7 is controlled by the controller 30.

Downstream of the evaporator 8, an air mix actuator 11 with a heater core 9 and an air mix damper 10 is provided.
Are provided respectively. This air mix actuator 11 is also of a motor type with a built-in potentiometer like the inside / outside air actuator 6.

The heater core 9 is provided in the engine cooling water passage 9A,
Water heated by engine cooling is supplied. A water valve 12 for adjusting the supply amount of hot water is provided in the cooling water passage 9A, and is adjusted by the controller 30 together with the air mix actuator 11. Therefore, the temperature of the air in the air conditioning duct 2 is set by the opening and closing of the water valve 12 and the opening of the air mix damper 10.

An air mix chamber scroll 13 is provided downstream of the heater core 9 and the air mix damper 10, and a blower fan 14 is provided in the chamber scroll 13. The number of revolutions of the blower fan 14 is changed by a blower fan motor 15 controlled by a controller 30 to change the flow rate of air in the air conditioning duct 2.

In the air mix chamber scroll 13,
The air that has passed through the heater core 9, that is, the hot air, and the air that has bypassed the heater core 9, that is, the cold air are mixed,
It will be at an appropriate temperature.

On the downstream side of the blower fan 14, there are provided outlet switching actuators 18A and 18B for moving the ventilation damper 16 and the defroster damper 17, respectively. The air outlet switching actuators 18A and 18B are controlled by the controller 30 so that the air outlet in the air conditioning duct 2 is removed from the passenger compartment 22.
It is set to one of the defroster outlet 19, vent outlet 20, and heat outlet 21 which are respectively opened.

A controller 30 for controlling each of the actuators 6, 11, 18A, 18B includes a CPU (central processing unit) 31, a RAM (random access memory) 32, an A / D converter 33, a main power supply circuit 34, a backup power supply circuit 35, and the like. It is configured.

The A / D converter 33 includes an inside air sensor 41 that detects the temperature inside the vehicle interior 22 using a thermistor or the like, an outside air sensor 42 that detects the outside air temperature, and the amount of solar radiation entering the vehicle interior 22 using a photodiode or the like. Sensors, such as a solar radiation sensor 43 for detecting the temperature of the evaporator 8, an evaporator sensor 44 for detecting the temperature of the evaporator 8, and a water temperature sensor 45 for detecting the temperature of the cooling water for the engine. I have.

The A / D converter 33 is connected to a temperature setting VR (variable resistor) 46 for setting the temperature in the passenger compartment 22, and sends set temperature data to the CPU 31.

On the other hand, a switch panel 47 provided in the passenger compartment 22 is connected to the CPU 31, and sends operation instruction information of the automatic air conditioner 1 by the A / C switch, the blower switch, the outlet mode selection switch, and the like to the CPU 31.

The CPU 31 stores information input from the sensors 41 to 45, the temperature setting VR 46, the switch panel 47, and the like in the RAM 32.

As a power supply for the CPU 31, a main power supply circuit 34 connected to the battery 48 via an ignition switch 49 and a backup power supply circuit 35 connected to the battery 48 via a backup switch 50 are provided. The backup switch 50 is controlled by the CPU 31 so as to maintain the connection for a short time after the ignition switch 49 is turned off.

Then, in this Jikki example, the set temperatures T ₁ to the temperature set amount VR46 stored in RAM32 of the controller 30, the operation of the case of storing converted to the displacement of the air mix actuator 11, FIG. 2, second The operation will be described with reference to the operation explanatory diagram of FIG. 5 and the flowchart of FIG.

FIG. 2 is an operation explanatory diagram when the ignition switch 49 is turned on. In this case, a main power supply circuit 34 is used as a power supply for the CPU 31 and the RAM 32.

The CPU 31 sets the set temperature T ₁ input from the temperature setting VR 46.
Was stored in the RAM 32 (S1), the input value, etc. The temperatures T ₁ and the respective sensors, and controls the air mix actuator 11,
The temperature of the air blown out to the passenger compartment 22 is adjusted (S
2).

The CPU 31 determines whether the switch 49 has been turned off (S
3) If the switch 49 is not turned off, the control of the air mix actuator 11 is continued (S2). On the other hand, when the switch 49 is turned off and power is not supplied from the main power supply circuit 34, the CPU 31 receives power supply from the backup power supply circuit 35 (S4).

Then, CPU 31, as shown in FIG. 3, reads the setting temperature T ₁ of which has been stored in the RAM 32 (S5), and converted into position data L ₁ of the air mixing actuator 11 (S
6), moving the actuator 11 to the position of the position data L ₁ (S7). From this set temperature T ₁ to position data L ₁
Is converted to, for example, the total movement amount of the actuator 11 by 10
Perform the aliquoting at every 1 ° C. between 15 ° C. and 25 ° C. according to the temperature.

After the actuator 11 moves to the predetermined position, the CPU 31 turns off the backup switch 50 (S8). Therefore, as shown in FIG. 4, the power of the CPU 31 is completely cut off,
No power is supplied to the power supply 32, and the data stored in the RAM 32 disappears. Further, the actuator 11 is also held at a predetermined position.

The CPU 31 determines again whether the ignition switch 49 has been turned on (S9), and when the switch 49 has been turned on, as shown in FIG. 5, reads the position of the actuator 11 (S10), and reads the position data L _1. Set temperature T ₁
(S10). At this time, the backup switch 50 is also turned on by the CPU 31.

Further, CPU 31 stores the set temperatures T ₁ in RAM 32 (S
1), and return to the control of the air mix actuator 11 (S2).

According such a present embodiment, the set temperatures T ₁ which has been stored in the RAM 32, remembers replaced with displacement of the air mix actuator 11 when the ignition switch 49 off, even if it is not supplied with power it can store the set temperature T _1.

Therefore, there is no need to continue power supply for data retention, and the battery does not run down even if the engine is restarted for a long time.

Furthermore, since the stored set temperatures T ₁ as a displacement amount of the actuator 11, there is no need to re-enter the setting temperature T ₁ of the time of the restart, it is possible to reduce the operation of the automatic air conditioning 1 operator, air conditioning 1 It can be controlled efficiently.

The set temperature T ₁ can be stored by using the air mix actuator 11 which has been conventionally used for the auto air conditioner 1,
Since no new parts or the like are required, it can be manufactured easily and at low cost.

It should be noted that the present invention is not limited to the configuration of the above-described embodiment, and modifications within a range that can achieve the object of the present invention are included in the present invention.

For example, in the above embodiment, by using the air mix actuator 11, but remembers the set temperatures T _1, outside air actuator 6, etc., it may store setting temperatures T ₁ using another actuator. Further, information to be stored, an input value of each sensor 41 to 45 to limited to the set temperature T _1, the control state of the blower fan 14, the error information of the respective sensors 41 to 45 may store other information . Further, different information may be stored in each actuator.

Although each actuator used a motor type with a built-in potentiometer, a diaphragm or the like having a potentiometer may be used, in short, it is physically displaced,
What is necessary is just to be able to hold that position.

In the above embodiment, when the ignition switch 49 is disconnected, it is used when it has stored the actuator 11 moves set temperatures T ₁ by CPU 31, which disconnects the switch automatic air conditioner 1 instead of the ignition switch 49 Good.

Furthermore, each actuator 6, 11, 18A, 1 in the air conditioning duct
The arrangement and shape of the 8B and the blower fan 14 and the like are not limited to those of the above-described embodiment, but may be other shapes.

〔The invention's effect〕

According to the present invention as described above, there is an effect that information can be stored even if the power is cut off for a long time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention. FIG. 1 is a block diagram of an automatic air conditioner, FIGS. 2 to 5 are operation explanatory diagrams, and FIG. It is. 1 ... automatic air conditioner, 6 ... inside / outside air actuator,
11 ... air mix actuator, 18A, 18B ... outlet switching actuator, 31 ... CPU as control means, 3
2 ... RAM as storage means, 34 ... Main power supply circuit, 49 ...
Ignition switch.

Claims (1)

(57) [Claims] 1. An automatic air conditioner comprising: an actuator used in an automatic air conditioner; control means for controlling the actuator; and storage means for storing predetermined information, wherein the control means stores the information when the power of the automatic air conditioner is turned off. A function of driving the actuator to a position corresponding to different information that is not directly related to the control position at the time of operation of the actuator stored in the information processing device, and information corresponding to the position of the actuator when the power of the auto air conditioner is turned on. An automatic air conditioner having a function of storing the information in the storage means.