JPH033241B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an input circuit that inputs a signal for modifying a program to an electronic control unit that controls a load according to a predetermined program.

Currently, the order of processes determined in advance by the user,
BACKGROUND OF THE INVENTION Household appliances are widely available on the market that include electronic controls that control devices according to time or the like. For example, in an electric washing machine equipped with such an electronic control section, the user can freely set the washing time, number of rinses, dehydration time, etc. according to the purpose. Here, the setting operation will be explained using the washing time as an example.

The operating panel of the washing machine is equipped with a rotatable dial switch, and the surface of the dial switch displays four different wash times: 0 minutes, 3 minutes, 6 minutes, and 9 minutes. The user can select a desired one from these four types of washing time depending on the purpose. A mechanical contact is provided inside the dial switch, and as the dial switch rotates, the connection status of the mechanical contact changes, and signals corresponding to each of the four types of washing times mentioned above are sent to the electronic control section. Output to. When the user selects the desired washing time and turns the dial switch, the dial switch outputs a signal corresponding to the washing time to the electronic control section, allowing the washing time to be set. Settings such as the number of rinses and dehydration time are performed in the same manner.

By the way, such settings such as washing time are made by changing the connection state of the mechanical contacts as described above, so the signal output when the mechanical contacts chatter is input to the electronic control section. There was a fear that the washing machine might malfunction.

In addition, when the user wants to change the initially set program while the washing machine is operating, for example, when the user wants to change the washing time from 9 minutes to 3 minutes, the user can change the washing time from 9 minutes to 3 minutes by pressing the dial switch.
When you turn it from 0 minutes to 3 minutes, the dial switch will go to 0.
Another disadvantage is that the signal output when the minute position is reached is input to the electronic control section, which instructs the electronic control section to proceed to the next program step (for example, draining).

In order to solve the above-mentioned problem, the present invention does not input the output signal when the input setting switch such as a dial type switch is chattering to the electronic control section, but only outputs the signal after the state of the mechanical contact has stabilized. If it is necessary to input data and change the program while the device is operating,
By not inputting the output signal that is output while the input setting switch section is being operated to the electronic control section, and only inputting the correct signal after the change operation is completed, the chatter of the input setting switch can be reduced. The present invention provides an input circuit that can prevent malfunctions of the equipment by not inputting unnecessary output signals to an electronic control unit during the operation of the equipment. Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing the basic configuration of the present invention, where 1 is an electronic control unit that controls the load unit 2 according to a predetermined program, and 3 is an electronic control unit that instructs the electronic control unit 1 to start the load unit 2. a start switch that outputs a start signal to
5 is an input setting switch section having mechanical contacts for setting signals for modifying the program such as process order and time, and 5 stores the output signal of the input setting switch section 4 at each predetermined sampling time. , a first storage means that outputs the stored signal until the next sampling time; 6, an output signal of the input setting switch section 4 and the first storage means 5;
This is a coincidence determination circuit that determines whether or not the output signals of the two match each other and outputs a coincidence signal when they match. Reference numeral 7 denotes a counter that starts operating when a coincidence signal is output from the coincidence discrimination circuit 6 and returns to the initial state when the coincidence discrimination circuit 6 stops outputting the coincidence signal. The number of samplings is measured in synchronization with
When the number of times reaches a predetermined value (a value determined in consideration of the chattering time), a first operation start signal is output. 8 is a timer that operates while the first operation start signal is output from the counter 7, and returns to the initial state when the counter 7 stops outputting the first operation start signal (counter 7 enters the initial state). Yes, the continuous output time is measured from the input of the first operation start signal, and this time is a predetermined time (a time determined in consideration of the speed at which the user moves the input setting switch section 4).
When this happens, a second operation start signal is output. 9 outputs the output signal of the counter 7 before the start signal is output from the start switch 3 (during the initial setting of the program), and outputs the output signal of the timer 8 after the start signal is output (during device operation). A selection circuit 10 outputs a signal, when the first operation start signal (at the initial setting of the program) or the second operation start signal (at the time of device operation) output from the selection circuit 9 is input, the first operation start signal 10 is output. storage means 5
This is a second storage means that stores the output signal of and outputs the stored signal to the electronic control section 1 until the next first or second operation start signal is input.

In the input circuit according to the present invention configured as described above, the counter 7 is stored in the second storage means 10 before outputting the start signal, that is, at the time of initial input setting.
The output signal is inputted via the selection circuit 9.
Even if chattering occurs at the mechanical contact during operation of the input setting switch section 4, the signal output at the time of chattering is the second one because the counter 7 does not output the first operation start signal. It is not stored in the storage means 10. Further, after the start signal is output, that is, while the device is in operation, the output signal of the timer 8 is input to the second storage means 10 via the selection circuit 9. The signal output from the input setting switch section 4 while the user is operating the input setting switch section 4 and the signal generated during chattering after the operation is completed are controlled by the timer 8.
does not output the second operation start signal,
It is not stored in the second storage means 10. Examples of the present invention will be described in detail below.

FIG. 2 shows an embodiment of the present invention (washing time input circuit in a washing machine), and the same reference numerals as in FIG. 1 indicate the same components. Here, the input setting switch section 4 has a switch 1 inside.
1 and 12 are provided, and the input setting switch unit 4 outputs four types of signals corresponding to washing time of 0 minutes, 3 minutes, 6 minutes, and 9 minutes, respectively, depending on the connection state of the switches 11 and 12. It can be output. The first storage means 5 is composed of two D flip-flop circuits 13 and 14, and stores the signals output from the switches 11 and 12 at the rising edge of the sampling pulse output from the oscillator 15, and stores the signals output from the switches 11 and 12. is output until the rising edge of the next sampling pulse. 16 is start switch 3
A flip-flop circuit that stores the output signal of
When a start signal is input, its output is inverted.
Match determination circuit 6 is exclusive OR circuit 1
7, 18 and an OR circuit 19,
Only when the two signals input to the exclusive OR circuit 17 match and the two signals input to the exclusive OR circuit 18 match
The output of the OR circuit 19 becomes Low. The counter 7 starts operating when the output of the coincidence determination circuit 6 becomes Low, and counts at the rising edge of the sampling pulse output from the oscillator 15. milliseconds), its output changes from Low to High. Here, during the operation of the counter 7, when the output of the match determination circuit 6 changes from Low to High,
The count number is reset to zero. timer 8
starts operating when the output of the counter 7 becomes High, measures the time based on the sampling pulse output from the oscillator 15, and when the time reaches a predetermined time (1 to 2 seconds), the output starts. changes from Low to High. Here, while the timer 8 is operating, the output of the counter 7 is
When it goes from High to Low, the initial state (clock time 0)
seconds). The selection circuit 9 is composed of AND circuits 20, 21 and an OR circuit 22, and its output changes from Low to High when the output of the counter 7 becomes High before the start signal is output from the start switch 3. After the start signal is output, the output of timer 8 is
When it goes high, it goes high. Second storage means 10
is composed of two D flip-flop circuits 23 and 24, and the output of the selection circuit 9 changes from Low to
At the rising edge of becoming High, the output signal of the first storage means 5 is stored, and thereafter the output of the selection circuit 9 becomes Low and the stored signal from Low to High again is output to the electronic control section 1. The electronic control section 1 controls a display 25, an alarm 26, and a mechanical section 27 such as a motor according to a program to be executed determined by a predetermined program and a signal output from the second storage means 10. do.

Next, the operation of this embodiment configured as above will be explained. First, at the time of initial setting of the program, that is, before the start signal is output from the start switch 3, the output signal of the counter 7 is inputted to the second storage means 10 via the selection circuit 9. When the user operates the input setting switch section 4, for example, from 0 minutes to 3 minutes to 6 minutes to 9 minutes, the connection state of the switches 11 and 12 changes in accordance with the operation, and the input setting switch section 4 changes. The signals corresponding to each time are sequentially output.
The signals output in this way are sequentially stored in the first storage means 5, and the output of the counter 7 is further stored in the first storage means 5.
The signals are sequentially stored in the second storage means 10 at the time of rising from Low to High. Finally, a signal corresponding to the nine minutes desired by the user is stored in the second storage means 10 and output to the electronic control section 1. In the above operation, when chattering occurs in the switches 11 and 12, the output of the coincidence determination circuit 6 is unstable and the output of the counter 7 does not become High. The signal sent to the second storage means 10 is never inputted to the second storage means 10.
In this manner, during the initial setting of the program, the set information can be inputted into the electronic control unit immediately after the user completes the setting operation, and the initial setting time can be shortened.

When the user sets the washing time, number of rinses, spin-drying time (the input circuit for the number of rinses and spin-drying time is not shown) as described above and operates the start switch 3, the output of the flip-flop circuit 16 is Conversely, the electronic control section 1 starts controlling the load section 2 according to the set program, and the output of the selection circuit 9 changes from the output of the counter 7 to the output of the timer 8.

Next, if it becomes necessary to change the washing time from 9 minutes to 3 minutes while the washing machine is operating, for example during washing operation, the user operates the input setting switch section 4 from 9 minutes to 0 minutes to 3 minutes. At the start of the operation, the output of the match determination circuit 6 changes from Low to High, and the counter 7
And the output of timer 8 changes from High to Low.
In this state, the second storage means 10 outputs a previously stored signal (a signal corresponding to a washing time of 9 minutes) to the electronic control unit 1, and the electronic control unit 1 stores the current information based on the signal. Continue what you are doing. Then, during the operation of the input setting switch section 4, a signal corresponding to the washing time of 0 minutes is output, and the output of the counter 7 is
Even if it becomes High, the output of the timer 8 does not become High for a predetermined period of time (1 to 2 seconds), so the signal corresponding to this washing time of 0 minutes is not input to the second storage means 10. Electronic control unit 1 is the previous signal (signal corresponding to 9 minutes of washing time)
Continue operating based on. Then, when the user's change operation is completed and the chatter of switches 11 and 12 stops, the output of counter 7 changes from Low to low.
becomes High, and from this point on for a certain period of time (1 second to 2 seconds).
seconds), the output of timer 8 changes from Low to High. When the output of the timer 8 rises from Low to High, the correct signal after the change (signal corresponding to the washing time of 3 minutes) output from the first storage means 5 is stored in the second storage means 10. Since it is stored and output to the electronic control unit 1, the electronic control unit 1 controls the load unit 2 based on this correct signal.
control.

In the embodiments described above, the setting of washing time has been explained as an example, but the number of rinses, spin-drying time, etc. can be similarly input to the electronic control unit. Furthermore, in electric washing machines,
By providing dedicated input setting switch sections corresponding to each of the washing time, number of rinses, and spin-drying time, the operability of the electric washing machine can be significantly improved.

As explained above, according to the present invention, at the time of initial input setting before the start signal is output, and at the time of setting change while the device is operating after the start signal is output,
By making a difference in the time it takes to memorize the settings, the device will not operate before the start unless the start switch is operated, so a short counter time is sufficient to determine a normal signal, and the settings After that, you can start operating the device immediately, which improves operability. On the other hand, while the device is operating after starting, setting the settings within a short period of time like using a counter may lead to incorrect settings, so use a timer to allow sufficient time for the settings to be changed. Since the information is memorized, there is an advantage that malfunction of the device can be prevented and the reliability and safety of the settings can be increased.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of the present invention.
FIG. 2 is a circuit diagram showing the configuration of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Electronic control part, 2...Load part, 3...Start switch, 4...Input setting switch, 5...First storage means, 6...Coincidence determination circuit, 7...Counter, 8...Timer, 9...Selection circuit, 10 ...Second storage means.

Claims (1)

[Claims] 1. In an input circuit that includes an electronic control unit that controls a load according to a predetermined program and a circuit that inputs a signal for modifying the program, the circuit that inputs the modification circuit inputs a signal that modifies the program. a start switch section that instructs the unit to start the load; an input setting switch section that sets a plurality of inputs to modify the program; and a first switch section that samples and stores the output of the input setting switch section at regular intervals. a storage means, a coincidence determination circuit for determining whether each output of the first storage means and the input setting switch section match, and a period during which the coincidence determination circuit outputs a coincidence signal; A first timer that counts in synchronization with the sampling operation of the first storage means; and a second timer that operates and outputs an output after the first timer counts a certain number or more. and, before the start switch is closed, the first
a selection circuit that selects the output of the second time measurement means after the start switch is closed; and a selection circuit connected to the first storage means and the selection circuit; an input circuit comprising a second storage means for storing the output of the first storage means based on the output of the first timekeeping means or the output of the second timekeeping means and inputting it to the electronic control section;