JPS61207206A - Air-conditioning controller for vehicles - Google Patents

Abstract

PURPOSE:To select external resistance values properly as well as to make an air-conditioning mode and a blast quantity automatically selectable, by shifting a sliding contact according to displacement in an expansion actuator consisting of a form memory alloy corresponding to a temperature variation inside a car. CONSTITUTION:A tension coil springlike expansion actuator 40 consisting of a form memory alloy is attached to a shift-adjustable frame 42 and free of movement along the longitudinal direction of a shaft 44. In addition, spring 46 is shiftably installed along the longitudinal direction of the shaft 44, and a sliding contact 78 is held in between the spring 46 and the actuator 40 whereby it is made shiftable according to displacement in the actuator 40. A contact 48 moves as coming into contact with a fixed contact 50, so that air flow of a blower motor 56, positional control over an air-mix damper, etc., are performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle air conditioning control device, and more particularly to an air conditioning control device with a simplified structure.

[Prior Art] As shown in FIG. 5, a conventional vehicle air conditioning control device includes an automatic temperature controller (ATC) 10, which includes a temperature setting lever 12) a room temperature sensor 14
．． Duct sensor 4 no 169 solar radiation sensor 18. The amount of detected signals from the potentiometer 20 was taken and these signals were manipulated. The calculation result is sent to the three-way solenoid valve 22, which opens the valve 11 to the hot side or the cool side in response to the command from the automatic temperature controller 10, and controls the power servo 24. was.

The power servo 24 includes a blower changeover switch 36- and the potentiometer 20.
By controlling the air mix damper 26, blower motor 28, and hot water valve 30, the vehicle was comfortably air-conditioned.

In the figure, the water shortage valve 30 closes the valve and stops the supply of water to the heater core 34 when the state is "strongly cold", and the duct sensor 16 detects the inside air after passing through the cooling unit 32 or Detects the temperature of the outside air,
In addition, the potentiometer 20 is the air mix damper 2.
6. BuE1a changeover switch 36. The state of the hot water valve 30 is detected.

[Problems to be Solved by the Invention] Conventional Problems However, the conventional device requires an automatic temperature controller (ATC), has a complicated overall device structure, and requires a lot of effort to attach to the vehicle body. It took a lot of man-hours.

This went against the industry's goal of reducing product costs by reducing the number of parts as much as possible, and was one of the issues that had been desired to be improved.

Purpose of the Invention The present invention was made to solve the above problems, and it is an object of the present invention to provide a simplified air conditioning control device for a vehicle by using a telescopic actuator made of a shape memory alloy as a temperature sensor. The purpose is to

[Means and effects for solving the problems] The vehicle air conditioning control device according to the present invention includes a telescopic actuator made of a shape memory alloy that changes its shape in response to changes in the temperature within the city, and a The contact includes a sliding contact that moves along the sliding contact, and a fixed contact that is provided along the moving direction of the sliding contact.

A feature of the present invention is to provide a vehicle air conditioning control system with a simplified structure by using a shape memory alloy as a temperature sensor.

As described above, the shape memory alloy approaches the memorized shape as the humidity increases, and conversely, as the temperature decreases, the resistance to external force decreases, or the property of expanding and contracting depending on the temperature is utilized.

Then, the sliding contact is slid according to the displacement of the telescopic actuator at this time, and the value of the external resistance connected to the blower motor or the like is appropriately selected by the sliding contact. Therefore, the air conditioning mode and the amount of airflow are automatically switched depending on the temperature inside the vehicle.

[Example〕 Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 is an explanatory diagram of the configuration of the present invention. In the figure, the expansion/contraction actuator 40 is made of a shape memory alloy that changes its shape in response to the temperature inside the vehicle, and is formed in the shape of a tension coil spring.

The telescopic actuator 40 is attached to a frame 42 whose movement can be adjusted, and is movable along the longitudinal direction of a shaft 44 provided on the frame 42.

The frame 42 is provided with a spring (tension) 46 that is movable along the longitudinal direction of the shaft 44 in the same manner as the telescopic actuator 40, and a sliding member is provided between the spring 46 and the telescopic actuator 40. A moving contact 48 is clamped. This sliding contact 48 is integrally attached to the telescopic actuator 40 and the spring 46, and is movable in accordance with the displacement of the telescopic actuator 40.

Also, along the moving direction of this sliding contact 48, a fixed contact 50
is provided, and the sliding contact 48 moves while contacting the fixed contact 50. This fixed contact 50 has three fixed contacts 50-
1.50-2 and 50-3, and a fixed contact 50-1 provided in the middle is made of an insulator.

The characteristic feature of the present invention described above is that the sliding contact 4
8 is either fixed contact 50-1 and 50-2 or 50-
3 to control the air volume of the blower motor 56.

In this embodiment, the sliding contact 48 has an insulator 48-1.4.
8-2. A first contact portion 48a partitioned by 48-3,
It has a second contact part 48b and a third contact part 48c,
Each of these contact portions 48a.

/I8b, 48c corresponds to the first fixed contact 50° and the second
Fixed contact 52. Third fixed contacts 54 are respectively arranged.

A blower motor 56 is connected to the first contact portion 48a, and the blower motor 56 is connected to a power source via a water temperature switch 58 and a device operation switch 60.

The contact portion 48b of the @memory 2 is connected to the power source via a switch 62 that is turned on and off in conjunction with the device activation switch 60, and the third contact portion 48c is connected to the device activation switch 60 as described above. It is connected to a power source via a switch 64 that is turned on and off in conjunction with the switch 60.

The first fixed contact 50 is an insulator 50-1 in the embodiment.
Resistors 50-2 and 50-3 are extended on both sides of the resistor. One ends of these resistors 50-2 and 50-3 are each connected to ground.

Further, the second fixed contact 52 has resistors 52-2 and 52- on both sides of the insulator 52-1, as described above.
3 is extended, and one end of each is connected to air mix dampers 66-1, 66-2 for cold air and hot air. Then, by adding the resistance value of the fixed contact 52 to the air mix damper 66, the air mix damper 66
position control is performed.

The third fixed contact 54 is provided on the resistor body 50-2. A cooling unit 68 is connected to one end.

FIG. 3 shows a stress-displacement diagram of the telescopic actuator 40 made of a unidirectional shape memory alloy.

As is clear from this figure, when the temperature is high, the telescopic actuator 40 generates a large internal stress and tries to approach the memorized shape, but as the temperature decreases, the resistance force against external force decreases. It has the property of being easily deformed.

The present invention having the above configuration will be explained in detail.

In FIG. 1, the frame 42 can be moved in the left and right directions (directions C and D) by manual operation. That is,
The sliding contact 48 can be moved relative to the fixed contact 50, 52, 54 by moving the frame 42.

Note that the water temperature switch 58 is turned ON when the temperature exceeds the set temperature, and when the device operation switch 60 is closed, the air conditioner starts operating.

Here, since the telescopic actuator 40 deforms continuously in response to changes in temperature, when the temperature is high (for example, 30° C. or higher), the telescopic actuator 40 deforms under the tension of the spring 46 as shown in FIG. 2(a). , and at the same time move the sliding contact 48 in the same direction.

On the other hand, when the fA is low (for example, 30° C. or less), the telescopic actuator 40 is extended by the tension of the spring 46, and the sliding contact 48 is moved in the direction of extension, as shown in FIG. 2(b). let

That is, in this example, a unidirectional shape memory alloy (as the temperature increases, it approaches the memorized shape,
Conversely, as the temperature decreases, the resistance to external forces decreases. ), a spring is required to apply an external force.

For this reason, for example, the room temperature is 10℃ to 20℃, and even 30℃.
4(c), (a), and (b), respectively, conceptually □.

Therefore, when the room temperature is 20° C., if the sliding contact 48 is initially set at an intermediate position between the fixed contacts 50° and 52 as shown in FIG.
．． 52, in contact with each insulator 50~1°52~1,
No current flows through the blower motor 56, air mix damper 66, or cooling unit 68, and they are in a stopped state. Therefore, the device does not operate, and neither cooling nor heating occurs.

Next, if the room temperature rises to 30°C or higher, the telescopic actuator 40 contracts as shown in FIG. 2(a),
The sliding contact 48 stops at the right end position with respect to the fixed contact 50.52° 54 as shown in FIG. 4(b). At this time, since a small external resistance is added to the propeller motor 56, a large current flows and the motor is driven at high speed.

At the same time, the cold air air mix damper 66-1 connected to the fixed contact 52-2 is opened wide, and cold air is supplied to the inside of the car to create a cooling state, and the cooling unit 68 connected to the fixed contact 54 is It is operated in the ``strongest'' condition.

On the other hand, when the temperature inside the vehicle drops to 10°C or less, the telescopic actuator 40 extends as shown in FIG. 2(b), and the active contact 48 moves to the left end as shown in FIG. 4(C). Stop at the position.

That is, the blower motor 56 and the air mix damper 6
A small external resistance is added to 6-2, and a large current flows through it. Therefore, the blower motor 56 rotates at a high speed, and the hot air mix damper 66-2 is wide open, creating a so-called heating state and supplying a large amount of warm air into the vehicle.

In the above, the material of the telescopic actuator 40 is a bidirectional shape memory alloy (within a certain temperature range, it gradually contracts as the temperature rises, and conversely, as the temperature falls, it gradually expands, or vice versa). ), it is also possible to eliminate the spring 46 for applying an external force to the telescopic actuator 40.

In addition, the switches 62 and 64 connected to the contact portions 48b and 48C of the sliding contact 48 are not configured to operate in conjunction with the device actuation switch 60, but instead are connected to the contact portion 48a of the sliding contact 48.
, 48b, and 48c may be short-circuited and a common power source may be used.

Furthermore, the telescopic actuator 40 and the spring 46 can be interchanged left and right. However, in this case,
Both need to be formed as compression coil springs.

As described above, in this embodiment, the conventional complicated automatic ff1f
The structure of the fi control device can be simplified, and the number of man-hours required for installation on the vehicle body can be reduced.
C) can be omitted to obtain a low-cost device.

[Effects of the Invention 121] As explained above, the present invention uses a shape memory alloy as a temperature sensor, thereby making it possible to obtain an air conditioner with a simple structure at low cost.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of an automatic ffl control device for a vehicle air conditioner according to the present invention, FIGS. 2(a) and 2(b) are diagrams showing the expansion and contraction states of the telescoping actuator, and FIG. Stress-displacement diagram of the telescopic actuator, Figures 4(a), 4(b), and 4(C) are diagrams showing the stop positions of the active contacts. Figure 5 is a diagram of a conventional vehicle air conditioning control system. FIG. 40... Telescopic actuator 42... Frame 44... Shaft 46... Spring 48... Sliding contact 50.52.54... Fixed contact 56...
Pro motor Fig. 1 Fig. 2 (a) (b) Fig. 3 Mugi Fig. 4 Fig. 50-3 50 5 (J-1 Fig. 5

Claims (2)

[Claims] (1) A telescopic actuator made of a shape memory alloy that changes its shape in response to changes in the temperature inside the vehicle, a sliding contact that moves in accordance with the displacement of the telescopic actuator, and a telescopic actuator provided along the direction of movement of the sliding contact. A vehicle air conditioning control device having a switch section with a fixed contact. (2) The device according to claim 1, wherein the resistance value of the switch portion is changed by changing the contact position between the fixed contact and the sliding contact. Control device.