JPH0241916A - Auto air conditioner - Google Patents

Abstract

PURPOSE:To enable information to be memorized even at the time of a long time power source cut-off, by driving an actuator to a position opposed to a memory information at the time of power source cut-off, and arranging so as to memorize the information opposed to the actuator position at the time of power source putting on. CONSTITUTION:When an ignition switch 49 is switched off, a CPU 31 receives the supply of power from a back up power source circuit 35, and reads a set temperature T1 memorized at an RAM 32, and converts this into the position data L1 of an air mix actuator 11, and moves the actuator 11 to the position of this position data L1. When the actuator 11 has moved to a predetermined position, a back up switch 60 is switched off. And at the time of the ignition switch 49 being switched on, the position of the actuator 11 is read, and memory is accomplished through conversion into the set temperature. Thus, memorizing can be realized even if power source is cut off for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an automatic air conditioner for an automobile, and more particularly to a storage means for various information.

[Conventional technology]

Traditionally, controllers that control auto air conditioners in automobiles have been equipped with input values for each sensor that detects internal air temperature, outdoor air temperature, solar radiation, cooling water temperature, etc. when the auto air conditioner is started, and errors such as short circuits and opens in each sensor. information,
A RAM is provided to store information such as the control status of the actuator for switching between inside and outside air, the blower fan, etc., the set temperature inside the vehicle, and other information when the auto air conditioner is operating, and is used for controlling the auto air conditioner operation.

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

However, if the information stored in the RAM when the auto air conditioner is operating, especially the set temperature, etc., can be saved until the next time the ignition switch is turned on and the engine is restarted, the auto air conditioner can operate more efficiently, and the auto air conditioner can be operated more efficiently. It is possible to reduce the number of operations required by the person.

Therefore, even when the ignition switch is turned off, the R
In order to maintain AM information, methods are being considered in which power is continuously supplied to the CPU using a battery or the like.

[Problem to be solved by the invention]

However, when the ignition switch is turned off, the CPU
Continuing to supply power to the engine poses no problem as long as it takes only a short time to start the engine next time, but if left unattended for a long period of time, it can cause the battery to run out.

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

[Means for Solving the Problems] The present invention is characterized in that an actuator used in an automatic air conditioner is used as an information storage medium, and includes an actuator, a control means for controlling the actuator, and a storage medium for storing predetermined information. and a storage means for driving the actuator to a position corresponding to the information stored in the storage means when the automatic air conditioner is powered off, and driving the actuator to a position corresponding to the information stored in the storage means when the automatic air conditioner is powered on. The automatic air conditioner is characterized in that information corresponding to the position of the actuator is stored in the storage means.

[For production]

In the present invention, when the power of the automatic air conditioner is turned off, the control means such as the CPU uses a backup power source etc. to read predetermined information stored in the storage means such as RAM, for example, the in-vehicle settings. The temperature and the like are converted into actuator position data, and the actuator is further driven according to the position data, thereby replacing predetermined information with the amount of displacement of the actuator. After that, the power to the automatic air conditioner is completely cut off.

When the automatic air conditioner is powered off, information stored in a storage means such as a RAM disappears.

Also, since no power is supplied to the control means, the actuator is held in the moved position.

When the automatic air conditioner is powered on again, the control means will
The position of the actuator is detected, and the position data of the actuator is converted into predetermined information and stored in the storage means, contrary to the case of power cutoff.

Thereafter, the control means uses this information to perform normal air conditioner control.

[Embodiments of the invention] Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a configuration diagram of an automatic air conditioner.

The auto air conditioner 1 is provided with an air conditioning duct 2, and the air conditioning duct 2 is formed with an inside air introduction port 3 and an outside air introduction hole 4. A motor-type internal/external air actuator 6 with a built-in potentiometer is provided at a branching point between the internal air inlet 3 and the external air inlet 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 internal/external 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. Further, the operation of the compressor 7 is controlled by a controller 30.

On the downstream side of the evaporator 8, there is an air mix actuator 1 with a heater core 9 and an air mix damper 10.
1 is provided for each. This air mix actuator 11 is also of a motor type with a built-in potentiometer, similar to the inside/outside air actuator 6.

The heater core 9 is provided within the engine cooling waterway 9A,
Water is supplied warmed by engine cooling. A water valve 12 for adjusting the supply amount of hot water is provided in the cooling water channel 9A, and is controlled by a controller 430 together with the air mix actuator 11. Therefore, the temperature of the air in the air conditioning duct 2 is set by the opening/closing of the water valve 12 and the opening degree 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.
A blower fan 14 is provided within this chamber scroll 13. This blower fan 14 is operated by a blower fan motor 15 controlled by a controller 30.
The rotational speed is changed to change the flow velocity of air within the air conditioning duct 2.

Moreover, in the air mix chamber scroll 13,
The air that has passed through the heater core 9, that is, warm air, and the air that has bypassed the heater core 9, that is, cold air, are mixed,
It will reach the appropriate temperature.

On the downstream side of the blower fan 14, outlet switching actuators 18A and 18B that move the ventilation damper 16 and the defroster damper 17 are provided, respectively. These outlet switching actuators 18A, 18B are
Under the control of a controller 30, the air outlet in the air conditioning duct 2 is set to one of a defroster outlet 19, a vent outlet 20, and a heat outlet 21, which are each opened in the vehicle interior 22.

The controller 30 that controls each actuator 6.11.18A, 18B is a CPU (central processing bag 31, R
It is composed of an AM (random access memory) 32, an A/D converter 33, a main power supply circuit 34, a backup power supply circuit 35, and the like.

The A/D converter 33 uses a thermistor or the like to
Inside the vehicle interior 2
2, an evaporator sensor 44 detects the temperature of the evaporator 8, a water temperature sensor 45 that detects the temperature of the engine cooling water, and other sensors are connected to the sensor. Set the value to CPU31
I am sending it to

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

On the other hand, a switch panel 47 provided in the vehicle compartment 22 is connected to the CPU 31, and sends information on automatic air conditioner operation instructions from the A/C switch, blower switch, outlet mode selection switch, etc. to the CPU 31. .

The CPU 31 controls each sensor 41 to 45 and VR4 for temperature setting.
6. Information input from switch panel 47 etc. is stored in RAM
I remember it at 32.

Also, as a power source for the CPU 31, the main power circuit 3 is connected to a battery 48 via an ignition switch 49.
4 and a backup power supply circuit 35 connected via a backup switch 50 are provided. The backup switch 50 connects the CPU 31 so as to maintain connection for a short time after the ignition switch 49 is turned off.
controlled by.

Next, in this embodiment, the set temperature T stored in the RAM 32 of the controller 30 by the temperature setting VR 46,
The operation of converting and storing the amount of displacement of the air mix actuator 11 will be explained with reference to the operation diagrams of FIGS. 2 to 5 and the flowchart of FIG. 6.

FIG. 2 is an explanatory diagram of the operation when the ignition switch 49 is turned on. In this case, CPU31, RAM
32, a main power supply circuit 34 is used.

The CPU 31 stores the set temperature T1 input from the temperature setting VR 46 in the RAM 32 (sl), and stores this temperature T,
The temperature of the air blown into the vehicle interior 22 is adjusted by controlling the air mix actuator 11 based on the input values of each sensor and the like (S2).

The CPU 31 determines whether the switch 49 has been turned off (33), and if the switch 49 has not been turned off, continues to control the air mix actuator 11 (S2).
. On the other hand, when the switch 49 is turned off and power is no longer supplied from the main power supply circuit 34, the CPU 31 receives power from the backup power supply circuit 35 (S4).

After that, the CPU 31 loads the RAM 3 as shown in FIG.
Read out the set temperature T1 stored in step 2 (S5),
Position data L of air mix actuator 11
, (36), and moves the actuator 11 to the position indicated by the position data L (S7). This set temperature T
1 to position data L1, for example, the total movement amount of the actuator 11 is divided into 10 equal parts, and the conversion is performed from 15°C to
This is done in 1°C increments between 25°C.

After the actuator 11 moves to a predetermined position, the CPU 31 turns off the backup switch 50 (S8). Therefore, as shown in FIG. 4, the power to the CPU 31 is completely cut off, and no power is supplied to the RAM 32.
The data stored in will be deleted. Moreover, the actuator 11 is also held in a predetermined position.

The CPU 31 determines whether the ignition switch 49 is turned on again (S9). If the switch 49 is turned on, as shown in FIG. 5, the CPU 31 reads the position of the actuator 11 (StO) and stores the position data L.
, is converted into a set temperature TI (310). At this time, C.P.
The backup switch 50 is also turned on by U31.

Furthermore, the CPU 31 stores the set temperature T in the RAM 32 (Sl) and returns to controlling the air mix actuator 11 (S2).

According to this embodiment, since the set temperature T1 stored in the RAM 32 is replaced with the displacement amount of the air mix actuator 11 when the ignition switch 49 is turned off, the set temperature can be set even when power is not supplied. Temperature T
1 can be memorized.

Therefore, there is no need to continue power supply for data retention, and the battery will not run out of power even if it takes a long time to restart the engine.

Furthermore, since the set temperature T is stored as the amount of displacement of the actuator 11, there is no need to re-enter the set temperature T when restarting. Can be controlled efficiently.

The set temperature T1 can be memorized using the air mix actuator 11 conventionally used in the auto air conditioner 1, and no new parts are required, making manufacturing easy.
Can be provided at low cost.

It should be noted that the present invention is not limited to the configurations of the embodiments described above, and the present invention includes modifications within a range that can achieve the object of the present invention.

For example, in the embodiment described above, the air mix actuator 11 is used to store the set temperature T, but the set temperature T1 may be stored using another actuator such as the inside/outside air actuator 6.

Further, the information to be stored is not limited to the set temperature T, but may also include other information such as input values of each of the sensors 41 to 45, control status of the blower fan 14, and error information of each of the sensors 41 to 45. Furthermore, different information may be stored in each actuator.

Each actuator uses a motor type with a built-in potentiometer, but a diaphragm or the like having a potentiometer may also be used, as long as it can be physically displaced and maintain its position.

In the embodiment described above, when the ignition switch 49 was turned off, the actuator 11 was moved by the CPU 31 and the set temperature T was memorized. good.

Furthermore, each actuator in the air conditioning duct 6゜11.1
The arrangement, shape, etc. of 8A, 18B, blower fan 14, etc. are not limited to those of the above embodiments, and may be of other shapes.

〔Effect of the invention〕

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 explanation of the drawing]

An embodiment of the present invention is shown in the drawings, in which FIG. 1 is a block diagram of an automatic air conditioner, FIGS. 2 to 5 are diagrams for explaining the operation, and FIG. 6 is a flowchart showing the operation. 1...Auto air conditioner, 6...Inside and outside air actuator, 11...Air mix actuator, 18A. 18B...Blowout outlet switching actuator, 31...CPU as control means, 32...R as storage means
A.M. 4... Main power circuit, 49... Ignition switch.

Claims (1)

[Claims] (1). It includes an actuator used in an automatic air conditioner, a control means for controlling the actuator, and a storage means for storing predetermined information, and the control means stores information stored in the storage means when the power to the automatic air conditioner is turned off. An auto air conditioner characterized by having a function of driving the actuator to a position corresponding to the position of the actuator, and a function of storing information corresponding to the position of the actuator in the storage means when the auto air conditioner is turned on.