JPH0310963B2 - - 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, an electric washing machine equipped with such an electronic control unit can perform a series of operations from washing to spin-drying, or only spin-dry, depending on the user's wishes.

However, in order to faithfully execute the operations set by the user, such electric washing machines, for example, change settings such as washing → rinsing → spin-drying.
If the user mistakenly makes meaningless settings such as washing → spin-drying, omitting the "rinsing", the settings will be carried out faithfully.

In addition, such settings are made by changing the connection state of the mechanical contacts in the input setting switch and outputting a signal according to the connection state to the electronic control unit. There was a risk that the signal output during chattering could enter the electronic control unit and cause the equipment to malfunction.

In order to solve the above-mentioned drawbacks, the present invention has been proposed to prevent the signal output from the input setting switch when the user makes an incorrect setting and the signal output when the input setting switch is chattering to be input to the electronic control section. The present invention provides an input circuit that can input only correctly set signals to an electronic control unit while preventing such problems. 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, in which 1 is an electronic control unit that controls the load section 2 according to a predetermined program, and 3 is a block diagram that modifies the program such as process order and time. The input setting switch section 4, which has a mechanical contact for setting the signal for the input setting switch section 4, stores the output signal of the input setting switch section 3 at each predetermined sampling time, and outputs the stored signal until the next sampling time. The first storage means 5 determines whether the output signal of the input setting switch section 3 and the output signal of the first storage means 4 match or not, and outputs a match signal when they match. The first match determining means 6 is a counter that starts operating when a match signal is output from the first match determining means 5 and returns to the initial state when the first match determining means 5 stops outputting the match signal. . Here, the counter 6 measures the number of samplings in synchronization with the sampling time while the coincidence signal is being output, and when the number of times reaches a predetermined value (a value determined in consideration of the chattering time). , the output is inverted.
A second storage means 7 stores the output signal of the first storage means 4 when the output of the counter 6 is inverted, and outputs the stored signal to the electronic control unit 1. Reference numeral 8 indicates a prohibition input storage means for storing a predetermined input prohibition signal and outputting the signal. Reference numeral 9 indicates whether the output signal of the input setting switch section 3 and the output signal of the prohibition input storage means 8 match. This is a second coincidence determining means which outputs a reset signal to the counter 6 when the two match. Here, the output signal of the second coincidence determination means 9 is also output to the electronic control section 1, and at the time when the reset signal is output, the electronic control section 1 controls the load section 2 to notify the user. In contrast, it is notified that the currently set information will not be input to the electronic control unit 1.

In the input circuit according to the present invention configured as described above, when the user completes the setting operation and the chatter subsides, the output of the input setting switch section 3 becomes stable and the counter 6 starts counting the number of sampling times. do. If the set signal is the correct signal, the counter 6 continues counting, and when the predetermined value is reached, the output is inverted, so the second storage means 7 stores the correct signal. Output to electronic control unit 1. If the set signal is incorrect, a reset signal is output from the second coincidence determination means 9 and the counter 6 is reset.
does not count the number of samplings and its output is not inverted, so the second storage means 7 does not store this erroneous signal, and furthermore, the electronic control section 1 controls the load section 2 to Notify the user that the information is incorrect. Examples of the present invention will be described in detail below.

FIG. 2 shows the configuration of an embodiment of the present invention, and the same reference numerals as in FIG. 1 indicate the same components. Here, switches 10 and 11 are provided inside the input setting switch section 3, and the input setting switch section 3 can output four types of signals depending on the connection state of the switches 10 and 11. The first storage means 4 is composed of two D flip-flop circuits 12 and 13, and an oscillator 14.
At the rising edge of the sampling pulse output from
The signals output from the switches 10 and 11 are stored, and the stored signals are output until the rising edge of the next sampling pulse. The first coincidence determination means 5 is composed of exclusive OR circuits 15 and 16 and an OR circuit 17, and the two signals input to the exclusive OR circuit 15 coincide, and the two signals input to the exclusive OR circuit 16 OR circuit 17 only when two signals match
The output of becomes Low. The counter 6 starts operating when the output of the first match determining means 5 becomes Low,
Counting is performed at the falling edge of the sampling pulse output from the oscillator 14, and the value is a predetermined value (40 milliseconds to 100 milliseconds in terms of time).
, the output changes from Low to High.
Here, while the counter 6 is in operation, when the output of the first coincidence determining means 5 changes from Low to High, the count number is reset to 0. counter 6
The output signal is input to the second storage means 7 via a selection circuit composed of AND circuits 18, 19 and an OR circuit 20. 21 is a start switch that outputs a start signal instructing the start of a process operation, 22 is a flip-flop circuit that stores this start signal, and the selection circuit outputs the output signal of the counter 6 before the start signal is issued. However, after the start signal is output, the output of counter 6 changes from low to high after a certain period of time from the time when the output of counter 6 changes from low to high.
Outputs the output signal of timer 23 which changes to High.
The second storage means 7 is composed of two D flip-flop circuits 24 and 25, and the output of the OR circuit 20 is
At the rising edge from Low to High, the output signal of the first storage means 4 is stored, and the stored signal is output to the electronic control section 1. The electronic control unit 1 controls a predetermined program and a second
The display 26, the alarm 27, and the mechanical parts 28 such as motors are controlled according to the program to be executed determined by the signal output from the storage means 7 of the controller. The inhibit input storage means 8 is composed of flip-flop circuits 29 and 30, and outputs a predetermined input inhibit signal. The second coincidence determining means 9 is composed of exclusive OR circuits 31, 32 and an OR circuit 33, and when the signals input to the exclusive OR circuit 31 match and the two signals input to the exclusive OR circuit 32 match, Only when the signal output from the input setting switch section 3 matches the input prohibition signal output from the prohibition input storage means 8, the output of the OR circuit 33 becomes Low. in this way
When the output of the OR circuit 33 becomes Low, the counter 6
is reset and its output does not go high.
Further, when the output of the OR circuit 33 becomes Low, the electronic control section 1 controls the display 26 and the alarm 27.
to notify the user that there is a setting error.

Next, the operation of this embodiment configured as above will be explained. First, before setting the program, the output signal (Low) of counter 6
is input to D flip-flop circuits 24 and 25 via an AND circuit 19 and an OR circuit 20.
When the user operates the input setting switch section 3, the connection state of the switches 10 and 11 changes in accordance with the operation, and finally a signal corresponding to the content desired by the user is sent to the input setting switch section 3. is output from. If the content set by the user is correct, the output of the second match determination means 9 is High, the signal output from the input setting switch section 3 is stored in the first storage means 4, and When the output of the counter 6 rises from Low to High, it is stored in the second storage means 7 and output to the electronic control unit 1. In the above operation, when chattering occurs in the switches 10 and 11, the output of the first coincidence determination means 5 is unstable and the output of the counter 6 does not become High. 3
The signal output from the second storage means 7 is never input to the second storage means 7. Further, if the contents set by the user are incorrect, the output of the second match determination means 9 becomes Low, so the counter 6 does not operate and the second storage means 7 inputs the input setting switch section 3. Do not store the signals output from the . Further, in such a case, the electronic control section 1 controls the display 26, the alarm 27, etc. to notify the user that the set contents are incorrect.

As explained above, according to the present invention, it is possible to reliably prevent a signal of a chattering state of the input setting switch section or an external noise signal from being input to the electronic control section, which may cause malfunction, and also to prevent the user from entering the electronic control section. This has the remarkable effect that it also prohibits the input of an erroneous setting signal when the erroneously set signal is set, and only the correctly set signal is always inputted.

[Brief explanation of drawings]

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. 1...Electronic control section, 2...Load section, 3
...Input setting switch unit, 4...First storage means, 5...First coincidence determination means, 6...Counter, 7...Second storage means, 8...Prohibition input storage means, 9... ...Second match determining means.

Claims (1)

[Claims] 1 In an input circuit that inputs a signal for modifying the program to an electronic control section that controls the load section according to a predetermined program, an input setting switch that outputs a High or Low signal for modifying the program. a first storage means for sampling and storing the output of the input setting switch section at regular intervals;
a first coincidence determining means for determining whether each output of the first storage means and the input setting switch section match; and counting a period during which the coincidence determining means outputs a coincidence signal; A timer having a function of inhibiting input of a chattering state signal or an external noise signal to the input setting switch unit, and storing an output of the first storage means when a count number of the timer reaches a certain number. Whether the outputs of the second storage means outputting to the electronic control unit, the inhibition input storage means storing a predetermined input inhibition signal, and the outputs of the inhibition input storage means and the first storage means match. a second device which determines whether or not the two clocks match, and outputs a reset signal to the clocking means if they match;
a coincidence determination means, and is characterized in that a chattering state signal, an external noise signal, and an erroneous setting signal from the input setting switch section are not output from the second storage means to the electronic control section. input circuit.