JPH07101068B2 - Motor valve opening / closing control device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing control device for various electric valves such as an electric expansion valve provided in a refrigerant circuit, and particularly to measures for improving starting torque.

(Prior Art) Generally, a refrigerant circuit of an air conditioner is disclosed in JP-A-59-1705.
As disclosed in Japanese Patent No. 78, an expansion valve is provided between the condenser and the evaporator to expand the high-pressure refrigerant and supply it to the evaporator. A pulse motor is connected to the expansion valve to form an electric expansion valve. The pressure of the refrigerant discharged from the evaporator is detected by a pressure sensor, and the pulse motor is controlled by a controller to control the expansion valve to open and close.

Since the pulse motor reversibly rotates at a fixed angle depending on the number of energizing pulses, the expansion valve opening can be controlled accurately. Then, when controlling the pulse motor, it is necessary to set the reference position of the valve opening degree with respect to the output of the opening / closing pulse. Therefore, the fully closed state of the expansion valve is set to the reference position. In other words, the number of pulses corresponding to the full open / close range from full open to full close is output to the pulse motor as a fully closed pulse at the time of initialization to start the control. Since the pulse motor rotates only the magnetic field and the rotor does not rotate, an accurate reference position can be set in the fully closed state.

(Problems to be Solved by the Invention) In the electric expansion valve described above, when the pulse motor is energized with a closing pulse while the expansion valve is fully closed, the rotor does not rotate. The valve is supposed to open exactly according to the number of pulses.

However, when the pulse motor is energized with a valve closing pulse from the fully closed state of the expansion valve, the valve body is further pressed to the valve seat rather than seated on the valve seat, resulting in a so-called tightening state. That is, as shown in FIG. 5 A, with respect to the valve-closing pulse number P _S of the expansion valve is fully closed, the number of valve opening pulse to be opened from該全closed
If P _O becomes large (see B and C) and the closing pulse that is energized after the valve body is seated on the valve seat is the tightening pulse, the number of this tightening pulse increases as shown in FIG. As the number of pulses increases, the number of valve opening pulses P _O increases, and the hysteresis increases. Furthermore, as shown in FIG. 7E, as the number of tightening pulses increases, the valve opening torque at the time of start-up increases, and the expansion valve may not open reliably. Therefore, accurate opening / closing control should be performed. However, there was a problem that the comfort of air conditioning was poor.

The present invention has been made in view of such a point, and by outputting a starting valve opening pulse from the fully closed state of the control valve to a predetermined opening at a low frequency, the starting torque is increased to reliably open the valve. The purpose is to do so.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the means taken by the invention according to claim 1 is, as shown in FIG. 1, first, a control valve (4) for controlling a fluid; It is premised on a motor-operated valve including a motor (5) which is controlled by an energizing pulse and which opens and closes the control valve (4).

Then, a valve opening command signal and a valve closing command signal for controlling the opening and closing of the control valve (4) are output, and a valve closing command signal is output during the valve closing control and the valve opening control from the valve closing state is performed. A valve opening command means (63) for outputting a start command signal is provided at times. Further, when receiving the valve opening command signal and the valve closing command signal of the valve opening command means (63), the motor (5)
A valve opening / closing means (64) for outputting a valve opening pulse and a valve closing pulse having a predetermined normal frequency to the drive circuit (7) to normally and reversely rotate the motor (5) and controlling the opening and closing of the control valve (4). It is provided. In addition, when receiving the full closing command signal of the valve opening commanding means (63), a full closing pulse obtained by adding a predetermined tightening pulse to the valve closing pulse for controlling the current opening to the fully closed state is applied to the motor ( There is provided a fully closed control means (62a) for outputting to the drive circuit (7) of 5) and fully closing the control valve (4). In addition, when the start command signal of the valve opening command means (63) is received, a start valve opening pulse of a low frequency lower than the normal frequency is output to the drive circuit (7) of the motor (5) to control the control valve. Starting valve opening means (6) for controlling valve opening of (4)
7) and the start command signal of the valve opening command means (63), the above-mentioned control is performed to a preset starting opening within an opening amount that is a minute opening larger than the opening corresponding to the tightening pulse. When it is determined whether or not the valve (4) is opened and the erroneous control valve (4) is opened to the opening degree, the opening control of the starting valve opening means (67) is terminated to open the valve opening / closing means ( 64) The start control ending means (62b) for shifting to the opening / closing control is provided.

The means taken by the invention according to claim 2 is the above claim 1.
In the invention, the control valve (4) is an expansion valve provided in the refrigerant circuit (1) of the air conditioner, while the valve opening / closing means (64) fully closes the control valve (4) at the time of initialization. A reference setting means (64a) for controlling the state to set the opening reference position is provided.

(Operation) With the above-described configuration, in the invention according to claims 1 and 2, for example, the expansion valve (4) provided in the refrigerant circuit (1) is provided with the valve opening command signal and the valve closing command signal of the valve opening command means (63). The valve opening / closing means (64) based on the valve command signal outputs a valve opening pulse and a valve opening pulse at a normal frequency, and the motor (5) is controlled to open and close by rotating in the forward and reverse directions. When the valve opening command means (63) outputs a fully closed command signal at the end of control, etc., the fully closed control means (62a) increases the valve opening pulse from the current opening to a fully closed state by a predetermined amount. The fully closed pulse added with the closing pulse is output to the drive circuit (7) of the motor (5) to fully close the expansion valve (4).

On the other hand, when the start command signal of the valve opening command means (63) is received by the start valve opening means (67), a start valve opening pulse of a low frequency lower than the normal frequency is given to the drive circuit (7) of the motor (5). To open the expansion valve (4). For example, the valve opening / closing means (64) normally outputs an opening / closing pulse at 200 pps, whereas the starting valve opening means (67) outputs a starting valve opening pulse at 150 pps, opening the expansion valve (4) from the fully closed state. Let me speak.

Then, when the activation control ending means (62b) receives the activation command signal of the valve opening instruction means (63), it is preset within an opening amount which is a minute opening larger than the opening corresponding to the tightening pulse. When it is determined whether or not the expansion valve (4) is opened at the starting opening and the expansion valve (4) is opened at the starting opening, the opening control of the starting valve opening means (67) is terminated. Then, the opening / closing control of the valve opening / closing means (64) is performed, and the expansion valve (4) is opened at the normal frequency.

Further, the reference setting means (64a) sets the opening reference position by controlling the expansion valve (4) to the fully closed state at the time of initialization.

(Effect of the invention) Therefore, according to the invention of claim 1, since the starting valve opening pulse from the fully closed state of the control valve (4) is output at a low frequency, the starting torque can be increased. As a result, the control valve (4) can be reliably opened, and in particular, even when the valve disc is biting the valve seat by the tightening pulse, this biting amount causes the valve to bite with high torque. Since the locked state can be released, the valve can be surely opened, and startup compensation can be performed to perform accurate flow rate control.

Furthermore, when the control valve (4) is opened to the opening degree corresponding to the tightening pulse, the control frequency is returned to the normal frequency. Therefore, after opening at least the biting amount by the tightening pulse,
Since the valve opening speed of the control valve (4) can be returned to normal and the valve can be quickly opened to the control position, the responsiveness can be improved.

Further, according to the invention of claim 2, the expansion valve (4) provided in the refrigerant circuit (1) can be reliably opened, so that comfortable air conditioning control can be performed, while the startup compensation is performed. Since the reference position can be set in the fully closed state while performing the above, it is possible to improve the accuracy of opening / closing control.

(Example) Hereinafter, the Example of this invention is described in detail based on drawing.

As shown in FIG. 2, (1) is a refrigerant circuit in a separate type air conditioner, in which the outdoor unit (2) and the indoor unit (3) are connected to each other to perform reversible operation in a cooling cycle and a heating cycle. It is configured to be possible.

The outdoor unit (2) includes a compressor (21), a four-way switching valve (22), a condenser during a cooling cycle, and an outdoor heat exchanger (23) on the heat source side which serves as an evaporator during a heating cycle.
An electric expansion valve (24) which is an electric valve is provided, and the devices (21 to 24) are connected to each other by a refrigerant pipe (11) so that the refrigerant can flow therethrough. Further, a temperature sensor (25) is provided in the suction side refrigerant pipe (11) of the compressor (21),
The temperature sensor (25) detects the suction pipe temperature.

Further, the indoor unit (3) is configured to include a user-side indoor heat exchanger (31) that functions as an evaporator during a cooling cycle and a condenser during a heating cycle, and the indoor heat exchanger (31) is provided with a refrigerant. The pipe (11) is connected. The outdoor unit (2) and the indoor unit (3) are connected to the closed circuit by the refrigerant pipe (11), and the four-way switching valve (22) is switched as shown by the solid line in FIG. 2 during the cooling cycle. While the refrigerant is circulated as indicated by the solid line arrow to cool and air-condition the room, during the heating cycle, the four-way switching valve (22) is switched as shown by the broken line in FIG. 2 to circulate the refrigerant as indicated by the broken line arrow. I am trying to air-condition. In FIG. 2, (26) is an outdoor blower fan, and (32) is an indoor blower fan.

As shown in FIG. 3, the electric expansion valve (24) is formed by connecting a pulse motor (5) to the expansion valve (4), and a flow path is provided in the valve body (41) of the expansion valve (4). (41a) is drilled,
The refrigerant pipe (11) is connected to the openings at both ends of the flow path (41a), the valve seat (42) is provided in the flow path (41a), and the valve is seatable on the valve seat (42). A body (43) is provided. Further, a valve shaft (44) is connected to the valve body (43), and a bellows (4) is provided between the valve shaft (44) and the valve body (41).
5) is provided to keep the valve body (43) airtight, and a screw member (46) screwed to the valve body (41) is brought into contact with the upper end of the valve shaft (44). There is. An output shaft (47) is connected to the screw member (46), and the output shaft (4
7) is the pulse motor (5) via the gear mechanism (48)
Of the pulse motor (5) is decelerated by the gear mechanism (48) and converted into vertical linear motion by the screw member (46), and the valve body (4) is connected to the valve body (4).
3) is designed to open and close.

The pulse motor 5 is controlled by the energizing pulse output from the opening / closing control device 6, and the controller (61) of the opening / closing control device (6) receives the intake pipe temperature from the temperature sensor (25) to control the degree of superheat. It is configured to calculate and store the valve resolution of the expansion valve (4) and the like.
The output signal of the controller (61) is input to the open / close signal output circuit (62), and the open / close signal output circuit (62)
Includes a valve opening command circuit (63), a valve opening / closing circuit (64), a fully closed control circuit (62a) and a start control ending circuit (62b), and the valve opening command circuit (63) includes Start valve opening circuit (6
7) is connected, the valve opening / closing circuit (64) is provided with a reference setting circuit (64a).

The valve opening command circuit (63) outputs a valve opening command signal and a valve closing command signal for controlling the opening and closing of the expansion valve (4) in response to the output signal of the controller (61) and fully closing the valve. A valve opening command means that outputs a fully closed command signal at the time of control and outputs a start command signal at the time of valve opening control from the fully closed state is configured.

When the valve opening / closing circuit (64) receives the valve opening command signal and the valve opening command signal of the valve opening command circuit (63), the motor drive circuit (7) opens and closes the valve at a predetermined normal frequency. Output a valve pulse to rotate the pulse motor (5) forward and backward,
It constitutes a valve opening / closing means for controlling the opening / closing of the expansion valve (4). For example, the number of pulses in the entire opening / closing range from the fully closed state to the fully opened state of the expansion valve (4) is set to 2000 pulses, 200ppm (pulse per se
cond) to output.

The reference setting circuit (64a) constitutes a reference setting means that controls the expansion valve (4) to a fully closed state at the time of initialization to set an opening reference position for opening adjustment.

When the fully closed control circuit (62a) receives the fully closed command signal from the valve opening command circuit (63), the fully closed control circuit (62a) adds a predetermined tightening pulse to the valve closing pulse for controlling the current opening to the fully closed state. A fully closed control means for outputting a closing pulse to the motor drive circuit (7) to fully close the expansion valve (4) is constituted, and the fully closed control circuit (62a), for example, In consideration of this, a fully closed pulse that is 50 pulses more than the valve closed pulse is output to the motor drive circuit (7). Is output to the motor drive circuit (7),
The pulse is a tightening pulse.

When the start valve opening circuit (67) receives the start command signal of the valve opening command circuit (63), it outputs a start valve opening pulse of a low frequency lower than the normal frequency to the motor drive circuit (7),
The starting valve opening means for controlling the opening of the expansion valve (4) is constituted. That is, the starting valve opening circuit (67) outputs the pulse frequency (200 pp) output by the valve opening / closing circuit (64) only when the valve opening is started.
s), for example, a start valve opening pulse is output to the motor drive circuit (7) at a frequency of 150 pps.

The start control end circuit (62b) is a valve opening command circuit (6
When the start command signal of 3) is received, whether or not the expansion valve (4) is opened to a preset opening degree within an opening amount which is slightly smaller than the opening degree corresponding to the tightening pulse or less. When the expansion valve (4) is opened to the opening degree, the opening control of the starting valve opening circuit (67) is ended and the opening control of the valve opening / closing circuit (64) is started. Constitutes a means. That is, the start control end circuit (62b) is
Even when the valve disc (43) is bitten into the valve seat (42) by the tightening pulse, at least the bite amount is released.
The expansion valve (4) is configured to open at a low frequency up to a starting opening (100 pulses) obtained by adding a small opening of 50 pulses to the tightening pulse, for example, 50 pulses.

Further, the opening / closing control device (6) is provided with a secondary valve opening signal output circuit (65) and a secondary valve closing signal output circuit (66). The secondary valve opening signal output circuit (65) is configured to output the secondary valve opening pulse when the opening / closing signal output circuit (62) outputs the fully closed pulse, that is, the entire secondary opening pulse signal is output at the time of initialization. After the closing pulse is output and after the full closing pulse is output at the end of the operation, the number of pulses at which the expansion valve (4) is slightly opened, for example, the secondary opening pulse of 150 pulses is output to the motor drive circuit (7). It is configured. And
The secondary valve closing signal output circuit (66) outputs the secondary valve opening pulse after the secondary valve opening signal output circuit (65) outputs the secondary valve opening pulse. The number of secondary opening pulses is the same as 150 pulses, and the expansion valve (4) is fully closed again.

Next, the cooling / heating operation of this air conditioner will be described.

First, during the cooling cycle, as shown by the solid line in FIG. 2, the four-way switching valve (22) is switched to circulate the refrigerant, and the outdoor heat exchanger (23) radiates heat to the indoor heat exchanger (31). While collecting heat, during the heating cycle, as shown by the broken line in FIG. 2, the four-way switching valve (22) is switched to circulate the refrigerant and the outdoor heat exchanger (23) collects heat and the indoor heat exchanger is collected. (31) radiates heat to air-condition the room.

Then, in this refrigerant circuit (1), the temperature sensor (2
5) detects the temperature of the suction pipe of the compressor (21), receives the refrigerant pressure signal, the controller (61) calculates the degree of superheat, and the electric expansion valve (24) is controlled. Therefore, the opening / closing control of the electric expansion valve (24) will be described based on the control flow of FIG.

First, in step ST1, when the power is turned on, the process proceeds to step ST2, initialization is performed, and the opening / closing signal output circuit (62) sends a fully closed pulse to the motor drive circuit (7) by the control signal of the reference setting circuit (64). Then, the expansion valve (4) is fully closed by the pulse motor (5). In other words, a fully closed pulse (P _T + Δ) that is obtained by adding the tightening pulse ΔP (50 pulses) in consideration of errors to the fully open / close pulse P _T (2000 pulses) that operates the expansion valve (4) from fully closed to fully open. P) is output at the normal frequency f ₂ (200 pps).

After this fully closed pulse (P _T + ΔP) is output, the secondary valve opening signal output circuit (65) outputs the secondary valve opening pulse P _A to the motor drive circuit (7), for example, 150 pulses are output. Then, the expansion valve (4) is once opened slightly. Then, after the secondary valve opening pulse P _A is output, the secondary valve closing signal output circuit (66) outputs the secondary valve closing pulse P _B to the pulse motor (5) to reopen the expansion valve (4) again. Close it. At this time, since the expansion valve (4) is opened from the fully closed state by the secondary valve opening pulse P _{A, a} low frequency f ₁ lower than the normal frequency f ₂ (for example, by the control signal of the startup valve opening circuit (67) (for example, Output at 150pps). Then, the reference position is set in the fully closed state of the expansion valve (4), for example, the step position is set to 0 and thereafter the valve opening pulse and the valve closing pulse are output.

Then, the process proceeds to step ST3, it is determined whether or not there is a valve opening signal, the process waits until there is a valve opening signal, and if there is a valve opening signal, the process proceeds from step ST3 to step ST4, and the startup valve opening circuit (67 ) When the valve opening command circuit (63) outputs a fully closing command signal, the activation valve opening pulse P _C outputs a normal frequency f ₂ (200 pps) lower than the low frequency f ₁ (150pps), the pulse motor (5 ) Is increased and the start compensation valve opening operation is performed. On the other hand, in response to the full closing command signal of the valve opening command circuit (63) and the output signal of the controller (61), the start control end circuit (62b) opens the expansion valve (4) to a predetermined start opening. It is determined whether or not it is a predetermined pulse (for example, 100 pulses)
Low frequency start valve open pulse P _C to start valve open circuit (67)
Is output and the valve is opened to a predetermined pulse, the control of the start valve opening circuit (67) is terminated and the normal frequency control is performed by the valve opening / closing circuit (64), and the valve is opened at the normal frequency f ₂ up to the set opening. The pulse is output to the motor drive circuit (7) to open the expansion valve (4) to the set opening.

Then, from step ST4 to step ST5,
Control expansion valve (4) in normal mode. That is, the controller (61) outputs a control signal so that the degree of superheat reaches a predetermined value based on the temperature of the suction pipe of the temperature sensor (25), and the valve opening command circuit (63) opens with this control signal. Alternatively, a valve opening command signal is output, and the valve opening / closing circuit (64) outputs a valve opening pulse or a valve closing pulse at the normal frequency f ₂ . As a result, the pulse motor (5) rotates forward and backward, the valve body (43) moves up and down, the expansion valve (4) is adjusted to the set opening, and the refrigerant flow rate is controlled in proportion to the number of pulses.

After that, the process proceeds to step ST6, it is determined whether or not there is a fully closed signal, and the process returns to step ST5 until there is a fully closed signal, while there is a fully closed signal that fully closes the expansion valve (4), the step Move from ST6 to step ST7. When the valve opening command circuit (63) outputs a fully closed command signal via the controller (61) when, for example, ending the air conditioning control,
The fully-closed control circuit (62a) outputs a fully-closed pulse obtained by adding the tightening pulse ΔP to the number of pulses of the current opening to the motor drive circuit (7) at the normal frequency f ₂ so that the expansion valve (4) is fully closed. Close it.
After the output of this fully closed pulse, the above step ST2
Similarly, the secondary valve opening signal output circuit (65) and the startup valve opening circuit (67) output the secondary valve opening pulse P _A at a low frequency f ₁ ,
Next, the secondary valve opening signal output circuit (66) outputs the secondary valve closing pulse.
P _B is output at the normal frequency f ₂ , the expansion valve (4) is slightly opened, and then fully closed.

Subsequently, returning to step ST3, it is determined whether or not the valve opening signal is output, and when the valve opening command signal is output again, the process proceeds to step ST4, while when the power is cut off, the opening / closing control is ended. . Then, when the power is turned on again, the operation from step ST1 is performed.

Therefore, after the opening / closing signal output circuit (62) outputs the fully closed pulse, the secondary valve opening signal output circuit (65) and the secondary valve closing signal output circuit (66) output the expansion valve (4). Since the valve is once opened and fully closed again, even if the tightening pulse ΔP is output to the pulse motor (5), the influence of the tightening pulse ΔP can be eliminated, and FIG. As described above, the expansion valve (4) can be opened with the same number of opening pulses as the closing pulse P _S for fully closing the expansion valve (4), and there is almost no hysteresis. You can
Therefore, it is possible to reliably prevent the valve body (43) from being locked, etc., and it is possible to accurately control the flow rate of the refrigerant and perform comfortable air conditioning control.

Further, as shown in FIG. 6D, the valve opening pulse increased as the tightening pulse ΔP increased, but it is possible to prevent the valve opening pulse from increasing as indicated by point D1. In particular, if the power supply is turned on and off continuously, the initialization has been performed continuously in the past, and the full closing pulse (P _T + ΔP) was all the tightening pulse. However, eliminate the effect of this tightening pulse. You can

Furthermore, as shown in FIG. 7E, the starting torque at the time of opening the valve increased with the increase of the tightening pulse, but the starting torque can be reduced within the E1 range.

Moreover, according to the present embodiment, since the starting valve opening pulse from the fully closed state of the expansion valve (4) is output at a low frequency, the starting torque can be increased.
The expansion valve (4) can be reliably opened, and in particular, even when the valve body is biting into the valve seat by the tightening pulse ΔP, this biting amount causes a high torque to open and bite. Since the state can be released, the valve can be surely opened, and start compensation can be performed to perform accurate flow rate control.

In addition, the expansion valve (4) is set to the opening degree corresponding to the tightening pulse.
When the valve is opened, the frequency is returned to the normal frequency. Therefore, after the valve is opened by at least the biting amount by the tightening pulse ΔP, the valve opening speed of the expansion valve (4) is returned to the normal speed to quickly reach the control position. Since the valve can be opened, the responsiveness can be improved.

Moreover, since the expansion valve (4) provided in the refrigerant circuit (1) can be reliably opened, comfortable air conditioning control can be performed, while the start position is compensated and the reference position is set to the fully closed state. Since it can be set, the opening / closing control accuracy can be improved.

On the other hand, as shown in F1 to F4 of FIG.
If the expansion valve (4) is left as it is after being energized, the starting torque increases with the number of days left, but the rate of increase can be reduced and accurate starting can be compensated.

In the present embodiment, the secondary valve opening pulse P _A and the secondary valve closing pulse P _B are set to 150 pulses, but the present invention is not limited to this, and in particular, the secondary valve opening pulse P _A May be the number of pulses at which the expansion valve (4) is slightly opened, and the secondary valve closing pulse P _B may be the number of pulses at which the expansion valve (4) is closed.

Further, in step ST5 of FIG. 4, the tightening pulse Δ
If P is small, the secondary valve opening pulse P _A and the secondary valve closing pulse
P _B does not necessarily have to be energized.

The frequency of the secondary valve opening pulse P _A may be the normal frequency f ₂ .

The electric valve of the present invention is not limited to the electric expansion valve (24),
It can be applied to various control valves, and the motor may be anything that is controlled by pulses.

Further, in the present invention, the secondary valve opening signal output circuit (65)
It is not always necessary to provide the secondary valve closing signal output circuit (66), but it is desirable to provide it.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention. 2 to 8 show an embodiment of the present invention, FIG. 2 is a refrigerant circuit diagram, FIG. 3 is a longitudinal sectional view of an electric expansion valve, and FIG. 4 is a control showing opening / closing operation of the electric expansion valve. It is a flowchart. FIG. 5 is a flow rate characteristic diagram for the opening / closing pulse in the vicinity of full closing, FIG. 6 is a change diagram of the valve opening pulse with respect to the tightening pulse, FIG. 7 is a characteristic diagram of the valve opening torque required for starting with respect to the tightening pulse, and FIG.
The figure is a diagram showing the change in the valve opening torque required for starting with respect to the number of days left unattended. (1) …… Refrigerant circuit, (4) …… Expansion valve, (5) …… Pulse motor, (6) …… Opening / closing control device, (7) …… Motor drive circuit, (24) …… Electric expansion valve , (25) …… Temperature sensor, (42) …… Valve seat, (43) …… Valve disc, (61) …… Controller, (62) …… Opening / closing signal output circuit, (62a)…
… Fully closed control circuit, (62b) …… Startup control end circuit, (6
3) …… Valve opening command circuit, (64) …… Valve opening / closing circuit, (64
a) …… Reference setting circuit, (65) …… Secondary valve opening signal output circuit, (66) …… Secondary valve closing signal output circuit, (67) …… Starting valve opening circuit.

Continuation of front page (72) Inventor Kei Kakimoto 1304 Kanaoka-cho, Sakai City, Osaka Daikin Industry Co., Ltd., Kanaoka Plant, Sakai Manufacturing Co., Ltd. (56) References JP 62-209279 (JP, A) JP 54-96826 (JP, A) JP 57-181970 (JP, A) JP 56-77439 (JP, A) JP 61-55566 (JP, A) JP 58-217876 (JP, A)

Claims (2)

[Claims] 1. A motor-operated valve comprising a control valve (4) for controlling a fluid and a motor (5) controlled by an energizing pulse to open and close the control valve (4). ) For opening and closing the valve, output a valve opening command signal and a valve closing command signal, output a fully closed command signal at the time of fully closed control, and output a start command signal at the time of valve open control from the fully closed state. When the valve opening commanding means (63) and the valve opening commanding signal and the valve closing commanding signal of the valve opening commanding means (63) are received, the drive circuit (7) of the motor (5) receives a predetermined normal frequency. A valve opening / closing means (64) for outputting a valve closing pulse and a valve opening pulse to normally and reversely rotate the motor (5) to control the opening and closing of the control valve (4), and the valve opening command means (63). When receiving the close command signal,
A full closing pulse obtained by adding a predetermined tightening pulse to the closing pulse for controlling the current opening to the fully closed state is output to the drive circuit (7) of the motor (5) to fully close the control valve (4). When receiving a start command signal for the fully closed control means (62a) for controlling and the valve opening command means (63),
Starting valve opening means (67) for controlling the valve opening of the control valve (4) by outputting a starting valve opening pulse of a low frequency lower than the normal frequency to the drive circuit (7) of the motor (5), and the valve opening valve. When the start command signal of the degree command means (63) is received,
The control valve (4) is set to a preset starting opening within an opening amount that is slightly larger than the opening corresponding to the tightening pulse.
When the control valve (4) is opened to the opening degree, the opening control of the starting valve opening means (67) is terminated to open / close the valve opening / closing means (64). A motor-operated valve opening / closing control device comprising a start control ending means (62b) for shifting to control. 2. The control valve (4) is constituted by an expansion valve provided in the refrigerant circuit (1) of the air conditioner, while the valve opening / closing means (64) fully controls the control valve (4) at the time of initialization. The motor-operated valve opening / closing control device according to claim 1, further comprising a reference setting means (64a) for controlling a closed state by setting the opening reference position.