JPH03263201A - Operation controller for apparatus - Google Patents

Abstract

PURPOSE:To surely stop the operation even in the case of the occurrence of circuit trouble of an input port or the like by only stopping the operation at the time when the operation state of a switch is detected by a single input port out of plural input ports. CONSTITUTION:An operation switch 31 is an automatic reset switch having a normally opened contact, and a microcomputer 40 of a controller 30 monitors the state of the operation switch through input ports 41a and 41b out of input/ output ports 41 repeatedly with a minute time with the unit; and when the close state of the contact is continuously detected with respect to these ports, the microcomputer 40 discriminates the switch 31 to be closed to start or stop the operation of an apparatus. When the operation state of the switch 31 is detected by only one of input ports 41a and 41b, the operation is not started but is only stopped. By this constitution, the apparatus is not operated by the malfunction due to external noise, and the operation is stopped even in the case of the occurrence of circuit trouble of either of input ports 41a and 41b.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a device control device for controlling the start and stop of device operation using a microcomputer-based control device, and particularly to a control device for controlling device operation for safety. Related to improvements to stop it.

[Prior Art] Various electrical appliances and gas appliances are often equipped with microcomputers (hereinafter referred to as microcomputers), and the optimum control state of each can be easily obtained.

These microcontrollers read signals from various switches as pulse signals in a short time, so it is easy to mistakenly read external noise as signals from the switches.

Therefore, when reading the state of a switch, if the closed state of the contact is read multiple times in succession, it can be detected as the operating state of the switch, and the switch can be connected to multiple input ports of the microcontroller. By detecting the switch operation signal from multiple input ports, it is distinguished from signals caused by noise, and by starting or stopping operation only when operation signals are obtained from multiple input ports, more accurate operation can be achieved. I'm trying to get the driving status.

[Problems to be Solved by the Invention] However, in equipment that involves combustion using a burner, such as a gas hot air heater, it is necessary to ensure safety, so it is not only necessary to obtain accurate operating conditions. When it is necessary to extinguish a fire, the operation must be stopped and the extinguishing operation and fuel stop operation must be performed reliably.

However, in conventional equipment, measures have only been taken to deal with external noise, and no measures have been taken in the event that an abnormality occurs in the input port due to a circuit failure in the microcomputer, etc. If a circuit failure occurs in an input port or the like, there is a problem in that even if the user attempts to stop the operation of the device, the device cannot be stopped.

The present invention prevents the device from starting operation due to a malfunction caused by external noise, etc. in a device where the operation of the device is controlled by a microcomputer, and also prevents the device from starting operation due to a malfunction due to external noise, etc., and in the unlikely event that a circuit failure occurs at the input port of the microcomputer while the device is operating. An object of the present invention is to provide an operation control device for equipment that can reliably stop the operation of the equipment according to the user's intention.

[Means for Solving the Problems] The present invention provides an operation control device that reversibly controls the operation and stopping of equipment by detecting the contact state of an automatic reset type switch using a microcomputer. is detected through a plurality of input ports, the operation of the device is started only when the operation state of the switch is detected by the plurality of input ports, and the operation of the device is started by any one of the plurality of input ports. The technical means is to stop the operation of the device when the operating state of the switch is detected.

[Operations] The present invention provides that the contact state of a switch is detected through a plurality of input ports, and when the operating state of the switch is detected through a plurality of input ports when the device is in a stopped state, the device The operation of the device is started, and if the operation state of the switch is detected through the plurality of input ports while the device is in the operating state, the operation of the device is stopped.

Additionally, if the operating state is detected through at least one of the multiple input ports,
It does not start operation, but only stops operation.

[Effects of the Invention] According to the present invention, operation is started only when at least a plurality of input ports are normal and the operation state of a switch is detected through each input port. never be done.

Furthermore, even if a circuit failure occurs in any of the plurality of input ports in a device that has just started operating, the operation can be stopped as long as the operation state of the switch is detected by at least one input port.

Therefore, it is less likely that the operation cannot be stopped due to a circuit failure, and if it is necessary to stop the operation, the operation can be reliably stopped.

[Example] Next, the present invention will be explained based on examples.

The gas hot air heater 1 of this embodiment, the schematic configuration of which is shown in FIG. 2, allows indoor air circulation! i! Gauging 10a formatting 10
In this case, room air is sucked in by the operation of a convection fan 13 through a suction port 12 provided with a filter 11, and a portion of the air is guided to a fuel mixing chamber 15 through an air guide pipe 14.

Further, a nozzle 21 from which the fuel gas supplied by the fuel supply pipe 22 is ejected is disposed in the upstream part of the fuel mixing chamber 15, and the fuel gas becomes a mixture in the fuel mixing chamber 15 and is combusted in the burner 16. I do.

The combustion gas is mixed with air in an air mixing chamber 17 within the casing 10a and blown out from a hot air outlet 18.

On the other hand, the fuel supply pipe 22 is provided as a fuel supply path 20, and the fuel supply pipe 22 includes solenoid valves 23, 24,
A governor 25 that keeps the fuel gas pressure constant and a proportional valve 26 that adjusts the amount of fuel supplied are provided.

Note that the upstream side and the downstream side of the proportional valve 26 are communicated with each other by a bypass 28 provided with a gas amount adjusting screw 27.

The gas warm air/heater 1 having the above configuration is started and stopped, and the amount of heating is controlled by a control device 30 (not shown) provided in the main body.

The control device 30 will be explained below.

The control device 30 includes an operation switch 31 for instructing the gas hot air heater 1 to start and stop operation, a temperature setting device 32 for setting a desired indoor temperature, and a timer mechanism (not shown). It is provided as a.

Further, a thermistor 33 for detecting indoor temperature is provided outside the casing 10a near the suction port 12, and a thermocouple 34 for detecting combustion temperature and an ignition electrode 35 are provided near the burner 16 inside the casing 10a. .

As shown in FIG. 3, the control device 30 includes a microcomputer (hereinafter referred to as "microcomputer") 40 and a microcomputer 4
It consists of a drive circuit 50 for driving each part of the gas hot air heater 1 according to the operating condition of the gas warm air heater 1, and when the operating state of the operation switch 31 is detected, it reversibly controls the start and stop of the operation, and during operation, the convection fan 13 and a proportional valve 26, the amount of fuel in the burner 16 and the convective flow of room air are regulated.

In the control device 30 having the above configuration, the operation of the gas hot air heater 1 will not be started due to external noise regardless of the operation of the operation switch 31, and if the operation needs to be stopped, the operation of the gas hot air heater 1 will not be started by the operation switch 31. The operation switch 31 is connected to the two input ports 41a and 41b of the input/output port 41 of the microcomputer 40, and
The PU 42 performs the following control based on the control program stored in the memory 43.

The operation switch 31 is an automatic return type having a normally open contact, and the microcomputer 40 repeatedly operates the input port 41a and 41b in predetermined minute time units through two input ports 41a and 41b of the input/output ports 41. The state of the switch 31 is monitored, and when the closed state of the contact point is detected continuously (2 to 3 times or more) for each port, the operating switch 31 is activated.
It is determined that the state is closed.

Hereinafter, the operation control operation of the microcomputer 40 during start and stop of operation will be explained based on FIG. 4.

In the following explanation, to simplify the explanation, the case where the closed state of the operation switch 31 is detected for both the input ports 41a and 41b will be referred to as "and port", and the input ports 41a and 41b will be referred to as "and ports". The state in which the closed state of the operation switch 31 is detected through only one of the ports is referred to as an "or port."

Furthermore, the state change permission flag that is to be determined when determining whether or not to permit reversal of the operating state is simply referred to as a "permission flag."

When a power plug (not shown) is connected to a power line, the operation is stopped as an initial state, and a permission flag for permitting reversal of the operating state is set to "1" (step 1).

Next, it is determined whether or not it is an AND port, and if it is an AND port (YES in step 2), it is determined whether or not the permission flag is "l", and the permission flag is "1". If (YES in step 3),
Reverse the operating state (step 4), start operation, and temporarily set the permission flag to r□ (step 5)
, and waits until it is determined whether or not the AND port continues (YE in step 6).
S).

In step 3, if the permission flag is not "1" (NO), step 4.5 is passed and step 6 is proceeded to.

If it is no longer an and port (No in step 6), return the permission flag to "1" (step 7)
, move on to step 2.

On the other hand, in step 2, if it is not an AND port (NO), it is determined whether it is an OR port.

If it is not an or port, then NO in step 8)
Then, the process moves to step 2 and waits until the closed state of the operation switch 31 is detected as an AND port or an OR port.

If it is an or port (YES in step 8)
), it is determined whether the permission flag is "1", and if the permission flag is "1" (YES in step 9), it is further determined whether or not the vehicle is in operation, and if it is in operation. YES in step 10), the operation is stopped (step 11), the permission flag is set to "0" (step 12), and it is determined whether or not the or port is continuing and the wait is made until it is no longer an or port ( Step 1
3: YES).

In step 10, if it is not in operation (No>
, move on to step 2.

Further, in step 9, if the permission flag is not "1" (No), step 10.11.12 is passed and step 13 is proceeded to.

If the port is no longer an orre port (NO in step 13), the permission flag is returned to "1" (step 14).
), move on to step 2.

By performing the above operation control operation, the gas hot air heater 1 according to the present embodiment is configured to perform the step 2 in FIG. Since it is not possible to leave the loop from step 8 to step 14, once the operation is stopped, it becomes impossible to start operation with Mitaka,
It operates as follows.

When the control device 30 is connected to the power line and the operation switch 31 is operated (YES in step 21)
), if it is an and port (YES in step 22) - it is operating normally without any circuit defects, and if it is stopped, it will start operation, if it is running, it will start operation. or performs a reversing operation (step 23).

Even if it is not an and port (in step 22
O), if it is an or port (YES in step 24), only if it is in operation (step 25)
(YES in step 26).

If it is not an AND port (No in step 22, and NO in step 24 if it is not an or port), the closed state of the operation switch 31 is not detected in either of the input ports 41a and 41b due to a circuit failure or the like. In this case, the process moves to step 21.

Also, in step 24 of the or port, Y
ES), if not in operation (NO in step 25)
>, that is, when the operation is stopped, the operation moves to step 21 without reversing the operation.

As described above, in this embodiment, the operation state of the operation switch 31 is detected through the two input ports 41a and 41b, and furthermore, if a circuit failure occurs regarding one of the input ports, the operation cannot be started. Even if an abnormality occurs, operation can be reliably stopped, and operation will not be started due to malfunction caused by external noise.

In this embodiment, a gas hot air heater is shown, but a stove, rice cooker, oven, etc. may be used as long as the operating state is controlled by a similar switch.

Moreover, it is not limited to gas equipment, and may be electrical equipment.

[Brief explanation of drawings]

Fig. 1 is a flowchart for explaining the operation of a gas hot air heater showing an embodiment of the present invention, Fig. 2 is a schematic diagram showing the bottom of the tank of the gas hot air heater, and Fig. 3 is a configuration of the control device. FIG. 4 is a flowchart for explaining the operation control operation of the microcomputer of the control device.

Claims (1)

[Scope of Claims] 1) An operation control device that detects the contact state of an automatic reset type switch using a microcomputer to reversibly control the operation and stop of equipment, comprising: the operation of the device is started only when the operation state of the switch is detected by the plurality of input ports, and the operation of the device is started by any one of the plurality of input ports. 1. An operation control device for equipment, characterized in that the operation of the equipment is stopped when an operating state of a switch is detected.