JP2548531B2 - Control device for air conditioning door - Google Patents

Description

The present invention relates to a control device for a motor-driven air conditioning door such as an air mix door.

[Description of Prior Art] FIG. 4 is a block diagram showing a conventional example of a control device of this type.

As is well known, 1 is an air mix door, which is arranged in a duct 4 between an evaporator 2 and a heater core 3, and is operated by the full heat side a to cause the evaporator 2 to move.
All the air given through is sent to the heater core 3,
By operating on the full cool side b, all the air is sent downstream without being given to the heater core 3. Such an air mix door 1 is driven by a motor 5 via a link mechanism, and an operating angle θ between the full heat side a and the full cool side b is connected to the motor 5 via a forward / reverse rotation circuit 6. It is regulated by the stop circuit 7.
The stop circuit 7 includes a conductive pattern 8 and a sliding contact 9 that slides on the conductive pattern 8 in association with the rotation of the motor 5. The conductive pattern 8 includes a common conductive track 8a connected to a power source and a full heat side a of the air mix door 1.
And a conductive track 8c that regulates the stop position on the full-cool side b of the air mix door 1. The forward / reverse rotation circuit 6 is an interlocking changeover switch 1 inserted in the energizing circuit of the motor 5.
0, 11 and select terminals 12 for each of these changeover switches.
a to 12c and 13a to 13c are prepared. The terminals 12a and 13a are normal terminals, the terminal 12a is connected to the conductive track 8b, and the terminal 13a is grounded. Changeover switch 10,
11 selects these terminals 12a and 13a, the motor 5
The air mix door 1 is driven toward the full heat side a via the and the sliding contact 9 is moved to the full heat side a at the same time. The sliding contact 9 is the conductive track 8b.
The electric power to the motor 5 is cut off when the air mix door 1 is removed, and the air mix door 1 is operated to the full heat side a. Terminals 12c and 13c
Is the reverse terminal, terminal 12c is grounded, terminal 1
3c is connected to the conductive track 8c. Changeover switch 1
When 0 and 11 select these terminals 12c and 13c, the air mix door 1 is driven toward the full cool side b through the motor 5, and at the same time, the sliding contact 9 moves to the full cool side b. Is performed. The sliding contact 9 is a conductive track.
When the motor 5 is removed from 8c, the motor 5 is de-energized and the air mix door 1 is operated to the full cool side b. Terminals 12b and 1
3b is an OFF terminal, and the changeover switches 10 and 11 select these terminals so that the air mix door 1 is stopped at an arbitrary opening within the range of the operating angle θ.

In the prior art having such a configuration, when the air mix door 1 is operated to the full heat side a or the full cool side b, and the motor 5 is de-energized due to the movement of the sliding contact 9, the air mix door 1 is always operated. There is no problem if it becomes a sealed state. However, the hermetically sealed state is not always caused due to variations in component accuracy or variations in the attachment position of the link mechanism between the air mix door 1 and the motor 5, and the like.
In addition, there is a possibility that the non-sealed state may be similarly caused due to wear of the component parts accompanying use, and as a result, the sheet property of the air mix door is defective, and there is a problem that cooling or heating efficiency is reduced. there were.

[Object of the Invention] The present invention has been made based on the above viewpoint, and an object of the present invention is to provide a control device for an air-conditioning door that can always obtain a good seat property.

[Means for Achieving the Object] According to the present invention, in a control device for controlling energization of a motor for driving an air conditioning door provided in a ventilation system of an air conditioner, when the air conditioning door is not in a closed position, A voltage signal generating means for applying a voltage signal of 1 and a second voltage signal larger than the first voltage signal when the air-conditioning door is in the closed position, through two resistors connected in series. At least one conductor pattern having a first conductive track connected to a power source and a second conductive track grounded shorter than the first conductive track, and sliding on the conductive pattern in association with rotation of the motor. A sliding contact, wherein the sliding contact is in contact with both the first and second conductive tracks, so that the first voltage signal is given by the voltage division by the two resistors, and the sliding contact contact Deviating from the second conductive track, the voltage signal generating means for applying the second voltage signal by applying the power supply voltage via one of the two resistors, and the voltage signal from the voltage signal generating means. Is compared with a reference voltage set to be larger than the first voltage signal and smaller than the second voltage signal to determine whether the voltage signal generating means has given the second voltage signal. The comparing means for detecting and outputting the motor stop signal when the second voltage signal is given, and the motor stop signal from the comparing means are input, and the predetermined time elapses after the input of the motor stop signal. A motor stop delay means for stopping energization of the motor, the delay circuit having a capacitor inserted between the output side of the comparison means and the ground, for delaying the motor stop signal, and the delay circuit. A transistor having a base connected to the output side of the transistor and a collector connected to the power supply; and a relay having a relay coil inserted between the emitter and the ground of the transistor and a normally-closed contact inserted between the power supply and the motor. Of the air-conditioning door having the motor stop delay means for stopping energization to the motor by opening the normally-closed contact by turning on the transistor by the motor stop signal given through the delay circuit. The above-mentioned object is achieved by the control device.

[Embodiment of the Invention] FIG. 1 is a configuration diagram showing an embodiment of the present invention, and the same reference numerals as those in FIG. 4 denote the same components.

The feature of this example is that delay relays 20 and 21 are provided between the forward / reverse rotation circuit 6 and the stop circuit 7, and it is detected that the air mix door 1 is switched to the closed position via the stop circuit 7. This is because the power supply to the motor 5 is turned off after a short time has passed after the detection. The delay relays 20 and 21 are electrically delayed so that their responses can be sent for a predetermined time, and both have normally-open contacts 20a and 21a. Delay relay 20
The normally open contact 20a is inserted and connected between the selection terminal 12a of the forward / reverse rotation circuit 6 and the power supply, and its relay coil 20b is inserted and connected between the conductive track 8b of the stop circuit 7 and the ground. . The normally open contact 21a of the other delay relay 21 is inserted and connected between the selection terminal 13c of the forward / reverse rotation circuit 6 and the power supply, and its relay coil 21b is connected between the conductive track 8c of the stop circuit 7 and the ground. Inserted and connected. The rest of the configuration is the same as in FIG.

With such a configuration, if the air mix door 1 is in the intermediate position as shown, for example, the sliding contact 9 of the stop circuit 7 is also in the intermediate position, so that both the delay relays 20 and 21 are in the excited state, and therefore The normally open contacts 20a, 21a of the are maintained in the closed state. In this state, assuming that the normal rotation terminals 12a and 13a are selected in the normal rotation reverse rotation circuit 6, the motor 5 is driven in the normal rotation direction, whereby the air mix door 1 is driven toward the full heat side a. At the same time, the sliding contact 9 is moved toward the full heat side a. When the air mix door 1 reaches the full heat side a, the sliding contact 9 is disengaged from the conductive track 8b, so that the excitation of the delay relay 20 is released. However, since the normally open contact 20a of the delay relay 20 is delayed for a short time without closing immediately,
The power supply to the motor 5 is continued during this delay time.
As a result, the motor 5 is driven into the locked state, and the air mix door 1 is inevitably closed on the full heat side a. From this state, in the forward / reverse rotation circuit 6, the reverse rotation terminal 12
If c and 13c are selected, the normally open contact 21a is closed because the delay relay 21 is in the excited state, so the motor 5 is driven in reverse and the air mix door 1 and sliding contact 9 are fully cooled. Driven towards side b. When the air mix door 1 reaches the full cool side b and the sliding contact 9 comes off the conductive track 8c, the delay relay 21 delays the motor 5 into a locked state.
The air mix door 1 is inevitably closed at the full cool side b. In this state, since the delay relay 20 is in the excited state, it can be driven to the full heat side a by switching to the normal rotation terminals 12a and 13a.

FIG. 2 is a block diagram showing another embodiment of the present invention, and the same reference numerals as those in FIG. 1 show the same parts.

In the figure, 30 is a conductor pattern that regulates the stop position on the full heat side a of the air mix door 1, 31 is a sliding contact that slides on the conductor pattern 30 in conjunction with the rotation of the motor 5, and 32 is an air mix door. 1 is a conductor pattern that regulates the stop position on the full-cool side b, and 33 is a sliding contact that slides on the conductor pattern 32 in conjunction with the rotation of the motor 5. The conductor patterns 30 and 31 are respectively composed of two conductive tracks 30a, 30b and 31a, 31b, and each of them is electrically independent. Conductive tracks 30a and 32a correspond to conductive track 8a in FIG. 1, conductive track 30b corresponds to conductive track 8b in FIG. 1, and conductive track 32b corresponds to conductive track 8c in FIG. . The sliding contacts 31 and 33 are electrically independent of each other and have the same moving direction and moving amount.

The conductive track 30a of the conductor pattern 30 that regulates the full-heat side a is connected to the power supply through the series connection of the detection resistors 34a and 34b, and the conductive track 30b is grounded. The connection point between the detection resistors 34a and 34b is connected to the (+) input terminal of the comparator 35, whereby the sliding contact 31 moves to the (+) input terminal of the comparator 35 and moves to the full heat side a. The power source voltage is applied via the resistor 34a when the sliding contact 31 is out of the conductive track 30b, and a lower partial voltage is applied by the resistors 34a and 34b when the sliding contact 31 does not reach the full heat side a. ing. A reference voltage is applied to the (-) input terminal of the comparator 35 by series resistors 36a and 36b layered between the power source and the ground. This reference voltage is smaller than the voltage applied to the (+) input terminal when the sliding contact 31 is disengaged from the conductive track 30b on the side of full heat a, and the sliding contact 31 has the conductive track 30b.
It is set to be larger than the divided voltage given in the state of being in electrical contact with, and when the sliding contact 31 is disengaged from the conductive track 30b on the full heat side a, the output of the comparator 35 is inverted to the H level. Is configured. The output terminal of the comparator 35 is a resistor inserted between it and ground.
It is connected to one end of the resistor 38 via 37. This resistance
The other end of 38 is connected to the base of a transistor 40 via a delaying capacitor 39 inserted between the ground and the other end. The collector-emitter circuit of the transistor 40 consists of a relay coil 41 of a relay 41 with one end grounded.
It is inserted between a and the power supply. The contact 41b of the relay 41 is a normally closed contact, one end of which is connected to the power supply and the other end of which is connected to the selection terminal 12a of the forward / reverse rotation circuit 6.

Regarding the conductor pattern 32 that regulates the full-cool side b, the normally closed contact 49b of the relay 49 at the final stage and the forward / reverse rotation circuit 6 are also included.
Except the connection between and, the detection resistor 42a, 42b, the comparator 43, the reference resistor 44a, 44b, the resistor 45, 46, the delay capacitor 47, the transistor 48 and the relay 49 constitute the exact same circuit as above. Has been done. The normally closed contact 49b of the relay 49 is inserted and connected between the power source and the selection terminal 13c of the forward / reverse rotation circuit 6.

With the above configuration, when the air mix door 1 is located between the full heat side a and the full cool side b, the sliding contact 31
Is in a state in which the conductive tracks 30a and 30b are electrically connected to each other. Therefore, a divided voltage lower than the reference voltage is applied to the (+) input terminal of the comparator 35, and the output of the comparator 35 is It is at the L level. Therefore, the transistor 40 is off, and the normally-closed contact 41b of the relay 41 is closed. Similarly, the other sliding contact 33 is also in a state of conducting between the conductive tracks 32a and 32b, so that the output of the comparator 43 is at the L level and the relay 49
The normally closed contact 49b of is closed.

In such a state, in the forward / reverse rotation circuit 6, the forward rotation terminal is
If 12a and 13a are selected, normally closed contact 41b of relay 41
A power supply voltage is applied to the motor 5 via the motor 5, and the forward rotation of the motor 5 drives the air mix door 1 toward the full heat side a, and at the same time, the sliding contacts 31 and 33 move the full heat side a.
Be moved to. When the air mix door 1 reaches the full heat side a, the sliding contact 31 is disengaged from the conductive track 30b, so a voltage higher than the reference voltage is applied to the (+) input terminal of the comparator 35, which causes the output of the comparator 35. Turns to H level. However, the transistor 40 does not turn on immediately because of the interposition of the capacitor 39, and the inversion to the on state is delayed until the charging of the capacitor 39 is completed. As a result, the power supply to the motor 5 is continued during this delay time, the motor 5 is driven into the locked state, and the air mix door 1 is inevitably closed at the full heat side a.

On the other hand, even if the sliding contact 31 is disengaged from the conductive track 30b, the other sliding contact 33 makes conduction between the conductive tracks 32a and 32b. Therefore, in the forward / reverse rotation circuit 6, the reverse rotation terminals 12c, 13 are provided.
When c is selected, the motor 5 is energized in the reverse direction via the normally closed contact 49b of the relay 49 in the closed state, and the motor 5 is rotated in the reverse direction. As a result, the air mix door 1 is driven toward the full cool side b, and the sliding contacts 31 and 33 are moved to the full cool side b. By this movement, the sliding contact 31 restores the conduction between the conductive tracks 30a and 30b, so that the output of the comparator 35 becomes L level, the capacitor 39 is discharged through the resistors 38 and 37,
The following delay operation becomes possible. When the air mix door 1 reaches the full cool side b, the sliding contact 33 becomes the conductive track 32b.
As described above, the output of the comparator 43 becomes H level, the motor 5 is driven into the locked state by the presence of the capacitor 47, and the air mix door 1 is inevitably closed on the full cool side b. In this state,
Since the sliding contact 31 is in a conductive state between the conductive tracks 30a and 30b, it is possible to drive to the full heat side a by switching to the normal rotation terminals 12a and 13a.

FIG. 3 is a constitutional view showing still another embodiment of the present invention, and the same reference numerals as those in FIG. 2 indicate the same components.

The feature of this example is that the air mix door 1 has a full heat side a.
Alternatively, the limit switches 50 and 51 are configured to detect that the full cool side b is reached. Limit switch 50 has air mix door 1 full heat side a
It detects that it has been driven to, and has a normally closed contact 50a. The limit switch 51 detects that the air mix door 1 is driven to the full cool side b, and has a normally closed contact 51a. When the air mix door 1 is located between the full heat side a and the full cool side b, the contacts 50a and 51a of the limit switches 50 and 51 are both closed.
Since the air mix door 1 is opened by reaching the full heat side a or the full cool side b, the closed state of the air mix door 1 is achieved by the same operation as in the case of FIG.

It goes without saying that each of the embodiments described above can be applied to the control of other air conditioning doors described by taking the air mix door as an example.

[Effects of the Invention] According to the present invention as described above, when the air conditioning door is closed, the motor for driving the door is driven into the locked state for a short time, so that the seating property when the air conditioning door is closed is improved. In addition, even if there are variations in component accuracy or variations in the attachment position of the link mechanism, it is possible to eliminate these effects and seal the air-conditioning door, thereby improving the cooling and heating efficiency. It is possible to provide a control device for an air conditioning door that contributes to further improvement.
Further, according to the present invention, since the sliding contact is in contact with both the first and second conductive tracks, the first voltage signal is given by the voltage division by the two resistances, and the sliding contact has the second voltage. Since the second voltage signal is provided by applying the power supply voltage through one of the two resistances by deviating from the conductive track, the first voltage signal is changed by changing the resistance value of the two resistances. And the voltage value of the second voltage signal can be easily changed, and it is easy to set a large voltage difference between the first voltage signal and the second voltage signal. According to this, it is possible to further prevent malfunction. Furthermore, according to the present invention, since the delay circuit having the capacitor inserted between the output side of the comparison means and the ground is provided to delay the motor stop signal, the delay time can be changed by changing the capacitance of the capacitor. Can be set freely, for example, due to an error in mounting the actuator that drives the air conditioning door, an error in forming the conductive pattern, or the like, the air conditioning door actually operates even though the sliding contact reaches the closed position of the air conditioning door. Even if the closed state does not occur, it can be easily adjusted by selecting the capacitance of the capacitor.

[Brief description of drawings]

1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention, FIG. 3 is a block diagram showing yet another embodiment of the present invention, and FIG. FIG. 1 is a block diagram showing a conventional example of a control device for an air conditioning door. 1 ... Air mix door, 5 ... Motor, 6 ... Forward / reverse rotation circuit, 8,30, 32 ... Conductor pattern, 9, 31, 33 ... Sliding contact, 20, 21 ... Delay relay, 34a , 34b, 42a, 42b …… Detection resistance, 36a, 36b, 44a, 44b …… Reference resistance, 35 …… Comparator, 39,47 …… Capacitor, 40,48 …… Transistor, 4
1,49 …… Relay, 50,51 …… Limit switch

Claims (1)

(57) [Claims] 1. A control device for controlling energization of a motor for driving an air conditioning door provided in a ventilation system of an air conditioner, wherein a first voltage signal is given when the air conditioning door is not in a closed position, When the air conditioning door is in the closed position, the first
Voltage signal generating means for providing a second voltage signal larger than the voltage signal of the first conductive track, the first conductive track being connected to the power source via two resistors connected in series, and the second grounded track shorter than the first conductive track. At least one conductive pattern and a sliding contact that slides on the conductive pattern in association with rotation of the motor, the sliding contact including the first and second conductive patterns. By contacting both of the tracks, the first voltage signal is given by the voltage division by the two resistors, and the sliding contact is separated from the second conductive track, so that the first voltage signal is applied via one of the two resistors. The voltage signal generating means for applying the second voltage signal by applying a power supply voltage, and the voltage signal from the voltage signal generating means is higher than the first voltage signal and higher than the second voltage signal. By comparing with the reference voltage set to be small, it is detected whether or not the voltage signal generating means gives the second voltage signal, and when the second voltage signal is given, a motor stop signal is given. Comparing means for outputting and a motor stop delay means for inputting a motor stop signal from the comparing means and stopping energization to the motor after a lapse of a predetermined time after the input of the motor stop signal. A delay circuit having a capacitor inserted between the output side and the ground to delay the motor stop signal, a transistor having a base connected to the output side of the delay circuit and a collector connected to a power supply, and a relay coil The normally-closed contact inserted between the emitter of the transistor and the ground has a relay inserted between the power supply and the motor,
A controller for an air conditioning door, comprising: a motor stop delay means for stopping energization to the motor by turning on the transistor and opening the normally closed contact by the motor stop signal given through the delay circuit.