JPS6349367Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to an automobile air conditioner, so-called an auto air conditioner, which has an automatic temperature control function.

(Prior Art) In this type of automotive air conditioner, one of the objects to be controlled is the position of the air mix door that adjusts the mixing ratio of cold air and hot air. and an electric control device for controlling at least the position of. The temperature inside the vehicle is set by a temperature setting device, but as disclosed in Japanese Patent Laid-Open No. 55-68417, this temperature setting device may be replaced with a conventional volume type device and be replaced with a push button type, for example. At the same time, a system has recently been developed in which a temperature display is provided separately from the temperature setting device and the set temperature is displayed on the temperature display.

However, in the above conventional example, the set temperature is set digitally, and the electric control device is connected to the power source via the ignition key switch, so the ignition key switch is opened to start the car engine. Once stopped,
The memory of the set temperature that was set before the engine was stopped is lost from the electric control device at the same time as the engine is stopped. For this reason, conventionally, when the ignition key switch is closed, an intermediate set temperature (for example, 25°C) is stored in a fixed storage device in the electric control device.
Based on the memory in this storage device, initial settings are made when the engine is started again.

On the other hand, a comfortable set temperature varies depending on individual differences in response to outside temperature, physical condition at the time, etc., and may be set to a temperature other than the above-mentioned initial setting temperature of 25°C. In particular, when setting the vehicle interior temperature to a temperature significantly different from the intermediate temperature, such as in summer or winter, even though it is common to set the same temperature before and after the engine is stopped, when the engine is started again, the initial setting is significantly different from the desired temperature, which causes the inconvenience of having to reset the temperature setting operation every time the engine is started.

(Problem to be solved by the invention) This invention solves the troublesome temperature setting operation caused by the memory of the previously set temperature being lost from the electrical control device when the ignition key switch is opened as described above. This was developed by focusing on providing a memory function to the potentiometer that detects the position of the air mix door.

(Means for Solving the Problems) The gist of this invention is to include an electric control device that controls at least the position of the air mix door so that the temperature inside the vehicle matches a desired target value, and this electric control device is equipped with a switch. In the automotive air conditioner, the air conditioner is connected to a power source via a potentiometer that detects the position of the air mix door, and a push-button temperature setting device that sets the temperature inside the vehicle, when the switch is opened. A driving means for displacing the air mix door in accordance with the set temperature is provided, and a storage device is configured to store the set temperature when the switch is opened as the position of the air mix door using the potentiometer.

(Function) Therefore, the target cabin temperature when the ignition key switch is opened is stored in the potentiometer, so the next time the ignition key switch is closed and the engine is started, the potentiometer will be If you initialize the electric control device based on the yometer's memory, the cabin temperature will be automatically set to the same temperature as the last time it was set.
Therefore, the above-mentioned problem can be achieved.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of an electric control device for an automobile air conditioner according to the present invention, and this electric control device controls at least the position of an air mix door 1 so that the temperature inside the vehicle matches a desired target value. It is connected to a power source 3 via an ignition key switch 2 that starts and stops the engine of the automobile.

The air mix door 1 is provided in the air conditioning case 4, and is movable from a full cool position F/C, which completely closes the passage to the heater core 5, to a full heat position F/H, which completely opens the passage to the heater core 5. Adjust the mixing ratio with the wind. Further, the air mix door 1 is operated by an actuator 6 of an electric control device, and the position of the air mix door 1 is controlled by a potentiometer 7 of the electric control device.
It is now being detected by The actuator 6 is driven by, for example, a DC electric motor or negative pressure introduced via a transducer, and is driven by a drive signal output from a microcomputer 8, which is the main body of the electric control device, to the air mix door drive circuit 9. Moved.

In addition, the air mix door drive circuit 9 is a relay RY.
A power source 3 is supplied through a switch 20 .

On the other hand, the potentiometer 7 is connected to the constant voltage circuit 10.
The position of the air mix door 1 is detected as a voltage value by dividing a constant voltage supplied through a variable resistor.

The microcomputer 8 includes, for example, pushbutton switches 11a, 1 for raising and lowering the set temperature.
A setting signal for the vehicle interior temperature set by the temperature setting device 12 consisting of the microcomputer 8 is inputted and digitally displayed on the temperature display 13 via an up/down counter built into the microcomputer 8. Each time the pushbutton switches 11a and 11b of the temperature setting device 12 are pressed once, the temperature inside the vehicle is set, for example, by 1°C.

The microcomputer 8 also receives switch signals from switches 14 such as an air conditioner switch, a fan switch, an inside/outside air changeover switch, a mode changeover switch, etc. The detection signal S ₁ as a voltage value from the potentiometer 7 and the detection signal S ₂ fed back as a voltage value from the potentiometer 7 are sent to the multiplexer 15 and the A/D converter 1.
6.

Microcomputer 8, multiplexer 15
A voltage is supplied to the A/D converter 16 via the constant voltage circuit 10.

This microcomputer 8 not only sends drive signals to the air mix door drive circuit 9 described above, but also sends drive signals to other control devices 17. Other control devices 17 include a blower, a compressor, an inside/outside air switching door, a mode door, and the like.

The configuration up to this point is almost the same as the conventional configuration, and one of the features of this invention is that when the ignition key switch 2 is opened, the air mix door 1
The present invention is provided with a driving means for displacing the temperature in accordance with the set temperature. To explain an example of this driving means, first, the A port, which is one of the input ports of the microcomputer 8, is connected to the ignition key switch 2 via the resistor 18.
Opening/closing signals of the ignition key switch 2 are inputted. 19 is a Zener diode. Further, a relay RY switch 20 is provided in parallel with the ignition key switch 2 via a diode 21, and this relay RY switch 20 is connected to the collector of a transistor 23 via a coil 22 of the relay RY. As long as the base of the transistor 23 is connected to the B port, which is one of the output ports of the microcomputer 8, via the resistor 24, and the emitter of the transistor 23 is grounded, the output from the B port is H. Maintain power supply voltage. 25 is a diode provided in parallel with the coil 22 of the relay RY. The operation is completed by moving the air mix door 1 to a position corresponding to the set temperature according to a program stored in the microcomputer 8 in advance, and the relationship of the position of the air mix door 1 with respect to the set temperature is As shown in the figure. That is, the set temperature when ignition key switch 2 is opened is, for example, 30°C.
In the above case, the air mix door 1 is moved to the full heat position F/H, and when the temperature is below 20°C, for example, the air mix door 1 is moved to the full cool position F/C, so that the temperature changes linearly between them. Incidentally, how the positions of the air mix door 1 are allocated to the set temperature can be determined freely other than that shown in FIG. 2 as long as there is a certain relationship.

Therefore, the set temperature when the ignition key switch 2 is opened is stored in the potentiometer 7 as the position of the air mix door 1, thereby forming a storage device that stores the set temperature in a readable and writable manner.

Next, an example of the control operation of the automobile air conditioner configured as described above will be explained according to the flowchart of FIG. 3 and supplies voltage to the microcomputer 8, multiplexer 15, and A/D converter 16. The microcomputer 8 starts processing at step 26. Then, when the ignition key switch 2 is closed, the A port becomes H in step 27, so an H signal is sent from the B port in step 28. This turns on the transistor 23, current flows through the coil 22 of the relay RY to excite it, and the switch 20 of the relay RY is closed.

Next, in step 29, the position of the air mix door 1 is selected and read from the potentiometer 7 via the multiplexer 15, and in step 30, the position of the air mix door 1 is displayed on the temperature display 13 so as to follow the characteristic line shown in FIG. to finish the initial settings. Furthermore, in step 30,
The abbreviation TD means set temperature, and the same meaning will be used in other steps below.

Next, the process advances to step 32, where normal control is performed. That is, initially, the temperature inside the vehicle is at step 26.
31, the position of the air mix door 1 is controlled so that the temperature indicator 13 has the initially set value.
Here, the initial set value is the set temperature when the engine is stopped, which is stored from the position of the air mix door 1, and the processing for this is performed in steps 34 to 34, which will be described later.
36.

After this, the air mix door position is changed to the temperature setting device 12 until the ignition key switch 2 is opened.
The vehicle interior temperature is controlled to be in accordance with the set value (displayed on the temperature display 13). Here, the set value of the temperature setting device 12 is as described above.
This can be arbitrarily replaced by push button switches 11a and 11b.

When the ignition key switch 2 is opened to stop the engine, the signal input to the A port becomes L, so it is determined in step 33 that the ignition key switch 2 has been opened. Then, in step 34, the position of the air mix door 1 is selected and read from the potentiometer 7 via the multiplexer 15, and it is determined whether this read value is the air mix door position (target value) for the set temperature shown in FIG. A determination is made in step 35. If the target value has not been reached, proceed to step 3.
At step 6, a drive signal is sent to the air mix door drive circuit 9, and steps 34 to 36 are repeated until the target value is reached. Proceed to step 37, which is the target value, and send a drive signal to the air mix door drive circuit 9.
OFF, and outputs an L signal from the B port in step 38. This causes the transistor 23 to
Since it is turned OFF, the switch 20 of relay RY is opened, and in step 39, the power supply 3 to the electric control device is turned OFF, and the process ends. In this way, when the ignition key switch 2 is opened to stop the engine, the set temperature is stored in the potentiometer 7 as the position of the air mix door 1.

In addition to the embodiments described above, this invention can also be applied to a system in which power is supplied from the ignition key switch 2 to an electric control device via an air conditioner switch.

As mentioned above, according to this invention, the set temperature when the engine is stopped is memorized by the position of the air mix door, so the next time the engine is started, it can be initialized based on that memory, and the temperature Setting operations can be made easier. Additionally, since the information is memorized based on the position of the air mix door, there is no need for a special memory circuit, and no power source is required for memorization, resulting in energy savings, and conventional electrical control equipment can be used as is. This has advantages such as being inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a circuit configuration diagram showing an embodiment of an electric control device for an automobile air conditioner of this invention;
The figure is a characteristic diagram showing the position of the air mix door with respect to the set temperature for storage in the same as above, and FIG. 3 is a flowchart showing an example of control operation in the same as above. 1... Air mix door, 2... Ignition key switch, 3... Power supply, 7... Potentiometer,
12... Temperature setting device, 13... Temperature display device.

Claims (1)

[Scope of utility model registration request] An air conditioner for an automobile comprising an electric control device which at least controls the position of an air mix door so that the temperature inside the passenger compartment coincides with a desired target value, the electric control device being connected to a power source via a switch, and having a potentiometer which detects the position of the air mix door, and a push-button type temperature setter which sets the temperature inside the passenger compartment, the air conditioner for an automobile comprising: a drive means which displaces the air mix door in response to a set temperature when the switch is opened; and a storage device which stores the set temperature when the switch is opened as the position of the air mix door by the potentiometer.