JPH03263101A - Controller of apparatus - Google Patents

Abstract

PURPOSE:To always set a desired control target value by setting the upper limit value or the lower limit value as an initial target value, at the time of starting the control, and changing the control target value by the other switch, even if one of two switches becomes a state that a contact remains closed. CONSTITUTION:As one of data groups in a memory 34, in order to set the heating quantity to six stages as the stage control, six pieces of control target value groups 36 extending from a first level H1 in which the heating quantity, that is, power consumption is minimum to a sixth level H6 in which the heating quantity is maximum are stored. In such a state, even if a sixth level H6 is set as an initial target value, and one of an up-switch 42 and a down-switch 43 becomes a state that a contact remains closed due to a failure, the control target value can be lowered by the other switch. In such a way, setting as desired can be executed surely.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device control device for selecting and setting a control target value for controlling a device using two switches.

[Prior Art] For example, in heating devices such as water heaters, electric stoves, space heaters, etc., the heating amount of burners, electric heaters, etc. is controlled by a control device, and in order to set these heating amounts, for example, The setting device is equipped with two switches, one for increasing the set temperature and the other for lowering it, and each switch has, for example, an automatic return contact that closes the contact only when manually operated. It is used.

In this case, it is not detected that each switch has been operated simply because the switch contact is closed, but only when the contact changes from an open state to a closed state is detected as an operation of each switch. By,
This prevents the set value from continuously changing even if the contacts remain closed due to a defect in each switch.

[Problems to be Solved by the Invention] As described above, in the conventional device, if the contact of one switch remains closed due to a defect, the setting must be made only with the other switch, so it is difficult to operate that switch. There is a problem in that the set value that is supposed to be changed cannot be obtained due to this, and the desired set value cannot be changed.

The present invention provides a device in which setting values are changed using two switches, and even if at least one switch becomes defective and the contact remains closed, the desired setting value will be maintained as long as the other switch is normal. The purpose is to provide a control device that can be obtained without fail.

[Means for Solving the Problems] The present invention includes a first switch and a second switch whose operation is detected in response to a change in a contact to a closed state, and has an upper limit value and a lower limit value, and has a continuous switch. A device that controls the device according to control target values selected from a group of control target values that are selectably provided in the control target values that are changed to opposite sides by detecting the operation of the first switch or the second switch. In the control device, when starting control of the device, either the upper limit value or the lower limit value is selected as the initial target value, and during control of the device, the control target value is set to the When the operation of the first switch for changing to the initial target value side is detected, if the contact of the second switch is not closed, changing the control target value to the initial target value side, If the contact of the second switch is closed, the technical means is to change the control target value to the opposite side of the initial target value.

[Operation] In the present invention, when the device starts operating, one of the upper limit value and the lower limit value is selected from the control target value group as the initial target value. Here, to simplify the explanation, we will temporarily assume that
It is assumed that the initial target value is "-limit value," the first switch changes the control target value toward the upper limit value, and the second switch changes the control target value toward the lower limit value.

If both the first switch and the second switch are normal, desired set values can be easily obtained by each switch.

Now, if the first switch becomes defective and its contacts remain closed, its operation will not be detected.
If there is no abnormality in the second switch, the control target value for controlling the device can be changed from the upper limit value as the initial target value toward the lower limit value.

Conversely, if the second switch becomes defective and its contact remains closed, when the first switch is operated, the control target value will be changed to the opposite side of the initial target value, that is, to the lower limit value side. Therefore, a desired control target value can be selected.

Note that even when the initial target value is the lower limit value, the desired control target value can be selected in the same way.

[Effects of the Invention] In the present invention, when starting control, either the upper limit value or the lower limit value is set as the initial target value, and if one of the two switches remains closed, the other one is set as the initial target value. The control target value is changed by the switch toward the upper limit value or lower limit value that is not set as the initial target value.
Since the control target value can be set, the desired control target value can be set without fail.

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

Fig. 2 shows an electric range 1 to which the present invention is applied. Each heater forms a glass top 2, a halogen stove 3, a nichrome stove 4, and a heat retaining stove 5. Also, a grill 7 with a grill heater is installed at the front of the front grill door 6. It is provided.

Each stove has a control circuit 30 installed in the electric range 1.
As a result, each heater is controlled according to the operation state of the operation panel 40 on the front, thereby achieving the heating state desired by the user.

The present invention is applied to the above-mentioned halogen stove, nichrome stove, and grill, but in this embodiment, only the control of the halogen heater 10 of the halogen stove 3 will be explained.

The control circuit 30 includes a microcomputer 31 (hereinafter referred to as "microcomputer") and a heater energizing circuit 32, as shown in FIG. The control state of the halogen heater 10 includes an up switch 42 and a down switch 43 for setting the heating amount and heating temperature, and a separately provided temperature sensor 8 to detect the temperature of the food to be cooked. , a temperature control switch 44 for controlling the temperature to a predetermined temperature is provided, and the amount of electricity supplied to the halogen heater 10 is controlled according to operation signals of each switch, and according to signals from various sensors (not shown). , performs safety control such as overheating prevention of the halogen heater 10.

Each switch is a push-button switch with an automatic return contact, and the contact closes only when the button is pressed.
When the push operation stops, the contact opens.

The up switch 42 is provided as a heating amount setting switch for increasing the heating capacity or setting temperature, and the down switch 43 is provided as a heating amount setting switch for decreasing heating capacity or setting temperature. , when temperature control is specified by the temperature control switch 44, it acts to set the target temperature for the temperature control performed based on the detection signal from the separately provided temperature sensor 8. If there is no control,
It is used for stage control in which the amount of heating is set in six stages according to the power consumption of the halogen heater 10.

In the following, only the case of stepwise control in which the power consumption of the halogen heater 10 is set by each heating amount setting switch will be described.

The microcomputer 31 is, for example, a one-chip microcomputer in which a CPU 33, a memory 34, and an input/output board 35 are integrated, and various data groups are prewritten in the memory 34 along with a control program.

As one of the data groups in the memory 34, in order to set the heating amount in six stages as stepwise control, six levels are set, from level H1, which has the minimum heating amount, that is, power consumption, to sixth level H6, which has the maximum heating amount. A control target value group 36 is stored.

Here, the halogen heater 1 is activated by the activation switch 41.
When energization of 0 is started, the sixth level H6 with the maximum heating amount is read out as the control target value and is set as the initial heating amount, and then the down switch 4 is operated as necessary.
When 3 operations are detected, the CPU is
33, the fifth level H5, the fourth level H4,...
, . . ., the control target value is changed in order up to the level H1.

Furthermore, if it is necessary to increase the amount of heating that was previously reduced, each time the operation of the up switch 42 is detected, the control target value is sequentially changed by the CPO 33 so that the amount of heating increases.

Here, only when the contact of each switch is detected to change from the open state to the closed state is detected as an operation, and if the contact remains closed, it is detected that the switch has been operated. do not.

Thereby, in a normal case where there is no abnormality in each switch, the necessary heating amount can be easily set.

Furthermore, in the present invention, even if one of the up switch 42 and down switch 43 has a contact failure and the contact remains closed, in order to ensure that the required heating amount can be set, When the microcomputer 31 detects the operation of the up switch 42, it activates the down switch 4.
When the contact of the down switch 43 is closed, the control target value is changed to decrease the amount of heating, and only when the contact of the down switch 43 is open, the control target value is changed to increase the amount of heating. do.

The target value setting control operation of the CPU 33 for this purpose will be explained below based on FIG. 5.

After the operation switch 41 is operated and the control of the halogen heater 10 by the microcomputer 31 is started, if it is detected that the down switch 43 has closed its contacts (YES in step 1), the down switch 43 is closed. The down flag to indicate that the contact is closed is “1”.
” is determined.

If the down flag is not "l" (No in step 2), this means that the closed contact of the down switch 43 has been newly detected, so the control target value is changed from, for example, the sixth level H6 to the fifth level. Lower the level by one step to H5 (step 3), and set the down flag to "1" (
step 4), and further starts a timer (step 5) to measure a predetermined time t.

If the down flag is "1" (YES in step 2), it is determined whether or not the timer is up, and if the timer has finished measuring time (step 6), it is determined that the timer is up. Set the timer flag to “
1” (step 7).

On the other hand, in step 1, if it is not detected that the down switch 43 has closed its contacts (No>,
Set the down flag to "0" (step 8) to indicate that the contact of the down switch 43 is open, and clear the timer (step 9) to stop the timer from measuring time and set the timer flag to "0". (Step 10).

If you went through step 5.7.10, then step 1
1, it is determined whether the contact of the up switch 42 is closed.

If the contact of the up switch 42 is not closed (NO in step 11), the up flag indicating that the up switch 42 is closed is set to "0" (step 12), and the process moves to step 1.

If the contact of the up switch 42 is closed (YES in step 11), it is determined whether the timer flag is "1", and if the timer flag is not "1", NO in step 13). , down switch 4
3 is normal, and the up switch 42 is operated again after it has been operated, and the user wants to operate the up switch 42, so if the up flag is 'IJ' ( (No in step 14), the control target value is increased by one step (step 15), and the up flag is set to "1" (step 16).
), then proceed to step 1.

Conversely, if the up flag is "1" (YES in step 14), it is considered that the up switch 42 is being operated continuously, so the control target value is not changed and the process moves to step 1. do.

In step 13, if the timer flag is "1" (YES), it means that the down switch 43 has closed its contacts for a predetermined period of time or more, and the down switch 43 has been operated at the same time as the up switch 42, or the down switch 43 is defective.

Therefore, if the up flag is "0", indicating that the contact of the up switch 42 does not remain closed (NO in step 17), the control target value is lowered (step 18), and Set the up flag to “1”
'' (step 19), and is used in place of the down switch 43 to lower the control target value, and then the process moves to step l.

Also, if the up flag is "1" (YES in step 17), this means that the up switch 42 is being operated continuously or the contact remains closed due to a failure. Proceed to step 1 without changing the control target value.

Note that power is first supplied to the control circuit 30 by operating the power switch 9 provided at the front of the electric range 1 as well.

Next, the operation for setting the control target value in the electric range 1 of this embodiment having the above configuration will be briefly explained based on FIG. 1.

When the operation switch 41 is operated to start controlling the halogen heater 10, initially the sixth level H, which has the maximum heating amount,
6 is set as the control target value (step 21).

Next, it is determined whether or not the operation of the down switch 43 is detected, and if the operation of the down switch 43 is detected (YES in step 22), the control target value is set to 1.
It is lowered by a step (step 23).

If the operation of the down switch 43 is not detected (NO in step 22), it is determined whether or not the operation of the up switch 42 is detected.

If the operation of the up switch 42 is not detected (No in step 24), the process moves to step 22 and the operation detection of each switch is repeated.

If the operation of the up switch 42 is detected (YES in step 24), it is detected whether the down switch 43 has closed its contacts.

If the contact of the down switch 43 is not closed (NO in step 25), the control target value is increased by one step (step 26), and the process proceeds to step 22.

If the contact of the down switch 43 is closed (YES in step 25), proceed to step 23,
Lower the control target value by one step.

In addition, in the above operation, when changing the control target value, if the control target value is at the sixth level H6, the control target value is not lowered; The target value is never increased, and each level is used as the lower limit and upper limit of the control target value.

As described above, in this embodiment, the sixth level H6 is set as the initial target value, and even if one of the up switch 42 and down switch 43 remains closed due to a defect, the other switch Since the control target value can be lowered by , desired settings can be made reliably.

In the above embodiment, the upper limit value was set as the initial setting value, but even if the lower limit value is set, if the control operation is changed depending on the state of the contact point of the up switch when the operation of the down switch is detected, You can also make the desired settings.

In the above embodiment, an electric range is shown, but the present invention can also be applied to air conditioners such as heaters and air conditioners, water heaters, and the like.

[Brief explanation of drawings]

Fig. 1 is a flowchart for explaining the operation of the electric range of this embodiment, Fig. 2 is a perspective view showing the appearance of the electric range to which the present invention is applied, Fig. 3 is a block diagram of the control circuit of the electric range, and Fig. 3 is a block diagram of the control circuit of the electric range. FIG. 4 is a front view showing the operation panel of the electric range of this embodiment, and FIG. 5 is a flowchart for explaining the target value setting control operation of the microcomputer in the control circuit of this embodiment. In the figure, 10... halogen heater (equipment), 30...
Control circuit (equipment control device f), 36... Control target value group, 42... Up switch (first switch), 4
3... Down switch (second switch), H6...
- 6th level (upper limit value), Hl... th level (lower limit value).

Claims (1)

[Claims] 1) A first switch and a second switch whose operation is detected in response to a change in a contact to a closed state, and which have an upper limit value and a lower limit value and are continuously selectable. In a device control device that controls the device according to control target values selected from a group of control target values changed to opposite sides by detecting operation of the first switch or the second switch, When starting control of the device, either the upper limit value or the lower limit value is selected and set as the initial target value, and during control of the device, the control target value is shifted to the initial target value side. When the operation of the first switch for changing is detected and the contact of the second switch is not closed, the control target value is changed to the initial target value side, and the second switch A device control device for equipment, characterized in that when a contact point is closed, the control target value is changed to the opposite side of the initial target value.