JPS6349437B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an actuator used in an air conditioning control system such as an air conditioner system or a heat source control system.

For example, in conventional air conditioning control systems,
When monitoring and controlling control valves, control dampers, power panels for driving motors, etc., they are monitored via a data collection panel and controlled by an air conditioning control section, and generally have the configuration shown in the block diagram in Figure 1. has been adopted.

In other words, a central device CE such as a computer, and data collection boards DGP _{1 to 1} distributed in various locations.
In addition to connecting the data collection panels DGP ₁ to DGPn with the common transmission path L, the temperature sensor T ₁ and humidity sensor H ₁ for measurement are individually connected to the data collection panels DGP 1 to DGPn, and the air conditioning control unit AC and air conditioning The power panel PP for equipment is connected, and the output of temperature sensor T ₁ and humidity sensor H ₁ is sent to data collection panels DGP ₁ to DGPn.
After converting it to a digital signal, the central equipment
The central equipment CE that received this while sending it to the CE
will be monitored.

On the other hand, the AC control unit calculates a control amount using the connected control temperature sensor T ₂ and humidity sensor H ₂ and operates the connected control valve MV and control damper MD.

Furthermore, the setting values set in the central device CE are
The data is transmitted to the air conditioning control unit AC via the data collection panels DGP ₁ to DGPn. The on/off signal determined by the central device CE is transmitted to the power panel PP via the data collection panel DGP.

However, in such a conventional system, although the central device CE and the data collection boards DGP ₁ to DGPn are connected by a common transmission path L, the data collection boards DGP ₁ to DGPn, the temperature sensor T ₁ , and the humidity sensor Between H ₁ and data collection board DGP ₁ to DGPn
and the air conditioning control unit AC and the power panel PP, and further between the air conditioning control unit AC and the temperature sensor T ₂ and humidity sensor.
H ₂ , control valve MV ₁ , MV ₂ , control damper MD ₁ ,
Between MD ₂ and MD ₃ , each individual wiring is required, resulting in a disadvantage that the wire material cost and the wiring man-hour cost are high.

In addition, in the conventional system, data collection panels DGP ₁ to DGPn and air conditioning control unit AC are required, and data collection panels DGP ₁ to DGPn and air conditioning in various formats are required depending on the number and type of devices connected to these. The control unit AC has to be prepared, and the lack of commonality reduces the effectiveness of mass production, and as these components become expensive, the system as a whole becomes expensive.

The present invention aims to fundamentally solve such drawbacks of the conventional technology, and is extremely effective in that it integrates a transmission circuit, a driver for a controlled device, etc., and has a data transmission and reception function as well as an operation function. The present invention provides an actuator for an air conditioning control system.

For convenience, the system configuration to which the present invention is applied will be described first.

That is, as shown in the block diagram of Figure 2,
Since the actuators ATm and ATs of the present invention have data transmission and reception functions, they can be connected to the air conditioning control unit ACD through a common line, and
Since each has a unique address, the control valve MV,
The control damper and power panel PP can be controlled individually, and their control status can be collected individually using polling signals, and these are connected only by a common transmission path L. Therefore, the cost of connecting wires and wiring man-hour costs are significantly reduced.

In addition, if you prepare a temperature sensor TS, humidity sensor HS, etc. that have equivalent functions, they can all be connected via a common transmission path L, and
The electric actuator ATm for control and the step actuator ATs that sends on/off signals directly control the control valve MV, control damper, and power panel.
Since the PP can be controlled, it becomes possible to integrate the conventional data collection panels DGP ₁ to DGPn and the air conditioning control unit AC, greatly simplifying the system configuration.

FIG. 3 is a block diagram of an electric actuator showing an embodiment of the present invention, in which a transmission circuit SR is provided which is connected to a transmission line L consisting of lines L ₁ and L ₂ and transmits and receives data signals via this line. The command signal and polling signal from the air conditioning control unit ACD are given to the control unit CNT via the transmission circuit SR, where they are decoded and a control signal corresponding to the command signal is given to the driver DR. , the motor control valve MV is controlled by the drive output of this
A motor M is driven as a controlled device to control the opening and closing of the valve.

However, the potentiometer RV coupled with the valve
is provided, which sends a signal according to the opening degree of the valve, and the output of this is converted to a digital signal by an analog-to-digital converter (hereinafter referred to as ADC) and then controlled. Department
The control unit CNT receives the valve opening value commanded by the command signal and the ADC/A/D
The opening value of the valve indicated by the output of is compared with the opening value of the valve, and the motor M is controlled in a direction in which the difference between the two opening values becomes zero.

In addition, since the air conditioning control unit ACD performs control calculations after checking the valve opening value at that time, the output of the ADC/A/D is sent to the air conditioning control unit.
It is necessary to send the data to the ACD, and in response to a polling signal from the air conditioning control unit ACD via the transmission circuit SR, the control unit CNT sends the output of the ADC/A/D to the transmission circuit SR, and via this, the valve The opening value data is sent to the air conditioning control unit ACD.

Note that the command signal and polling signal include information indicating the address, and it is determined that the unique address set by the address setter AS matches the address specified by the command signal and polling signal. The control part
The CNT makes the determination and, depending on the match, performs the above-mentioned operations.

In addition, the control unit CNT stores programs for various purposes in its memory in order to facilitate sharing through high-density integrated circuits, etc., and the programs in the memory are specified by the mode setter MS. It is becoming. In this case, the mode setting device
MS is used to set the operating mode as an electric actuator.

In addition, in order to prevent the valve opening degree from being left unspecified in the event that data signal transmission/reception becomes impossible, a reference value setter SS is provided to ensure accurate command signal transmission. If reception is no longer performed, the control unit CNT determines this and controls the motor M by determining the opening degree of the valve to the value preset by the reference value setter SS. Also provided is a pulse generator PG that generates clock pulses for regulating the operation of the ADC/A/D.

However, in this case, in addition to transmission line L,
A power supply path Lp consisting of L ₃ and L ₄ is used, and the power supply AC such as 24V AC is used.
is given to the motor M, and the power supply AC is supplied to the power supply circuit.
After being rectified and stabilized by PS, it is supplied as power source E to each part.

FIG. 4 is a circuit diagram showing the circuits of the driver DR and the motor M. When the control unit CNT sends a signal F for normal rotation of the motor, the transistor Q ₁ is turned on and the light emitting diode of the photo triax PT ₁ is turned on. The light is emitted, and the triax opposite to it turns on, and the triax TA ₁ is connected through the resistor R ₁ .
In order to apply gate voltage to
TA ₁ is also turned on, and the windings of motor M are connected from the power supply AC.
At the same time as energizing L ₁ , the winding L ₂ is energized via the phase advancing capacitor C, causing the motor M to rotate forward and, for example, a valve connected to it to open. ing.

Furthermore, if signal B for motor reversal is given from the control unit CNT, transistor _Q2 is turned on.
The light emitting diode of the photo triac PT ₂ emits light, and the corresponding triac turns on, applying a gate voltage to the triac TA ₂ through the resistor R ₂ , so that the triac TA ₂ is also turned on, and the voltage is removed from the power supply AC. The winding _L2 of the motor M is energized, and the winding _L1 is energized via the capacitor C, so that the motor M performs reverse rotation, and in this case,
The valve becomes obstructed.

In addition, there is a manual (M) and automatic (A) selector switch _S1 , and when this is set to manual (M), turning on switch _S2 causes the motor M to rotate forward and the valve to open. On the other hand, when switch _S3 is turned on, the motor M reverses and the valve rotates in the (CLOSE) direction, so the valve can also be opened and closed by manual operation. has become something that can be controlled.

The main functions of the control unit CNT are "START" when the power is turned on, "initial processing" that sets the initial state of each part, "measurement processing" such as capturing the count value of counter CUT and storing it in memory,
There are five types: "contact information processing" that captures information from contact S and stores it in memory, "transmission processing" that transmits measurement data in response to requests from the center, and "command processing" such as execution based on commands from the center. It is.

FIG. 5 is a flowchart showing the details of the transmission process, and it is determined whether the received data arrives within a predetermined time after "setting the measurement data obtained by the measurement process" into the transmission register. After performing a "timer start" to monitor the data, it enters a standby state, performs a parity check etc. in response to data reception, and checks for errors.
If “Reception error occurred?” is NO, whether or not it is a command signal is determined by “Command signal?”
If NO, it is determined whether or not it is a polling signal by "Polling signal?", and then, in response to YES, the address specified by the polling signal and its own address are determined by "Does address match?"

If "Address match?" is YES, perform "preparation for transmission" and then transmit the contents of the transmit register by "data transmission", and then select YES for "transmission completed?"
Terminate the transmission accordingly.

In addition, if ``reception error occurred?'' is YES, the ``error flag is set'' in response to YES in ``timer time up?'', while if ``command signal?'' is YES, the command value indicated by the command signal is set. ``Receive command data'', determine whether ``address matches?'' in the same manner as above, and then ``set command flag'' according to YES, and then ``set command data to command register.'' and “command processing”
Make preparations.

FIG. 6 is a flowchart showing the details of "command processing", and it is determined whether "transmission is normal" according to the status of "error flag set" in FIG. Based on the status of “Command flag set” in “Is there a command flag?”
“Is the command data normal?” Checks whether the command value indicated by the command data is within the specified range.
Judgment will be made accordingly.

If “Command data normal?” is YES,
Stop sending control signals to driver DR,
After “motor stop”, the opening value indicated by the command and the output of ADC/A/D are adjusted according to NO of “Command data fully closed?” and NO of “Command data fully open?” The difference from the opening value thus indicated is determined by calculation, and then set in the output register of the opening value difference, and the predetermined tolerance error of the opening value difference "D ₁ opening value difference" is set. After determining this, in response to NO, a "monitoring timer preset" is performed to check whether the response of the motor M and the valve is performed normally, and then the opening value difference is reduced. A direction control signal is sent to the driver DR by "command sending".

Also, “Monitoring timer time up?”
In NO, "opening measurement" is performed by sequentially storing the output of ADC/A/D in memory, and in response to this, "opening value difference is set in the output register" as described above, and a control signal is sent to driver DR. is sent by "command sending", and by "opening sending" due to excessive rotation of the valve, the sign of the opening value difference is reversed due to excessive rotation of the valve, and the control signal changes from F to B accordingly. , or check whether there is a change from B to F with “Command polarity change?” ” and perform the “command flag reset,” or judge the predetermined tolerance of the opening value difference “D ₂ opening value difference” and if this is YES, perform the “command flag reset”. After this, the sending of the control signal is stopped and the "motor is stopped".

If "transmission normal?" is NO, "preset value set by reference value setter AS is set to output register" and "error flag reset" is then performed. In this case, the control after "motor stop" and "command data fully closed?" is performed based on the preset value, and the opening degree is determined according to the preset value.

In addition, in response to NO in the “Command data normal?”, “Error flag set” is performed,
If ``Command Data Fully Closed?'' is YES, a ``Full Close Command'' is sent, and if ``Command Data Fully Open?'' is YES, a ``Full Open Command is sent'', and the motor M is immediately moved in the fully closed or fully open direction. continuously controlled.

In addition, if an abnormality occurs in the motor M or valve mechanism, "Monitoring timer time up?"
becomes YES, the "motor failure flag is set" and the process immediately shifts to "motor stop".

Therefore, the motor M is controlled in response to data exchanged with the air conditioning control section, and the opening degree of the valve is set in accordance with the command data of the command signal.

However, the air conditioning control unit ACD
A command signal and a polling signal are paired and periodically transmitted to ATm and ATs, and a space period is provided at the timing of transmitting these signals to indicate the current opening value. The data signal is transmitted during this space period, and is received by the air conditioning control unit ACD.

In addition, each setting device MS, AS,
It is preferable for the SA etc. to use a diode matrix circuit and generate a predetermined code by cutting out a predetermined diode, but it is also possible to use a digital switch, a strap terminal, etc.

Further, the configuration of the driver DR can be selected arbitrarily depending on the conditions, and a rotary code generator or the like may be used instead of the potentiometer RV.
Phantom power is supplied through the transmission line L, and the power supply line
The same applies even if Lp is omitted.

As is clear from the above explanation, according to the present invention, it is possible to obtain an actuator that can connect a plurality of actuators directly to a control device, thereby greatly simplifying the configuration of an air conditioning control system, etc., and reducing the cost of interconnecting wires and wiring. The man-hour cost is reduced, the system configuration can be changed and expanded easily, and the entire system can be constructed at low cost, and a remarkable effect can be obtained as an actuator in an air conditioning control system.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional air conditioning control system, Fig. 2 is a block diagram showing an air conditioning control system to which the present invention is applied, Fig. 3 is a block diagram showing an embodiment of the present invention, and Fig. 4 5 is a circuit diagram of the driver and motor circuit, FIG. 5 is a flowchart showing details of "transmission processing", and FIG. 6 is a flowchart showing details of "command processing". SR...Transmission circuit, CNT...Control unit, DR,
DR ₁ ~ DRn...Driver, AS...Address setter.

Claims (1)

[Scope of Claims] 1: a transmission circuit that transmits and receives data signals; a driver that drives a controlled device; an analog-to-digital converter that converts a signal according to a control amount of the controlled device into a digital signal; When the address specified by the command signal via the transmission circuit matches the own address, the controlled device is controlled via the driver in response to the command signal, and the device is controlled by the polling signal specified by the transmission circuit. an actuator for an air conditioning control system, comprising: a control section that transmits the output of the analog-to-digital converter as data via the transmission circuit when an address of the actuator matches its own address.