JP2778596B2 - Showcase self-diagnosis device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-diagnosis device for a device requiring temperature control such as a showcase.

2. Description of the Related Art FIG. 3 is a block diagram of a conventional self-diagnosis device for a showcase, and FIG. 4 is an operation flowchart thereof.

In FIG. 3, reference numeral 1 denotes a temperature detector for detecting a temperature inside the showcase, 2 denotes a variable resistor for setting a control temperature,
Reference numeral 3 denotes a control temperature determining unit to which a signal from the variable resistor 2 is input. 4 is a temperature control means, 5 is a load such as a compressor, and the temperature control means 4 is a temperature detector 1 and a variable resistor 2
Is input and output to the load 5.

Reference numeral 6 denotes an abnormal temperature determining means to which a signal from the control temperature determining means 3 is input. Reference numeral 7 denotes an abnormal temperature detecting means to which signals from the temperature detector 1 and the abnormal temperature determining means 6 are inputted. Reference numeral 8 denotes a timer for inputting a signal from the abnormal temperature detecting means 7. 9 is an abnormal temperature control means, 10 is a lamp, 11 is a buzzer, the abnormal temperature control means 9 inputs a signal of the timer 8,
Output to 11.

The operation of the conventional showcase self-diagnosis apparatus configured as described above will be described below with reference to the flowchart of FIG.

First, when the power is turned on, the timer 8 is reset in step a, and the signal S ₁ from the temperature detector 1 is reset in step b.
The input to the temperature control unit 4 (the input temperature at this time is T _1). Next, in step c, the signal S ₂ from the variable resistor ₂
Is input to the control temperature determining means 3 (input temperature at this time is
T _O ). Next, at step d, the control temperature determining means 3
The signals S ₁ from the signal S ₃ and the temperature detector 1 from input to temperature control means 4 compares the input temperature T ₁ and T _O, otherwise the ON load 5 if I satisfies (1) If so, the signal S4 is output from the temperature control means ₄ to the load 5 to turn it off (step e).

In T _O T ₁ ...... ₍₁₎ then step f, determining the control temperature determining means to input signal S ₅ to the abnormal temperature determining means 6 from 3 (2) abnormal temperature T ₂ in accordance with equation.

T ₂ = T _O + K ₁ (2) (K ₁ : a predetermined constant) Next, at step g, the signal S ₆ from the temperature detector 1 and the signal S ₇ from the abnormal temperature determination means 6 The abnormal temperature detecting means 7
Entered, compares the input temperature T ₁ of the abnormal temperature T _2, if I satisfies (3), the process proceeds to step h and otherwise to step j.

T ₂ T ₁ (3) In step h, the signal S ₈ of the abnormality detecting means 7 is input to the timer 8 to reset the timer 8, and in step i, through the abnormal temperature control means 9, the lamp 10 and the buzzer 11
Is turned off, and the logic returns to step b.

In step i, the signal S ₈ of the abnormality detecting means 7 is
To start counting.

Next, at step k, a signal S ₉ is input from the timer 8 to the abnormal temperature control means 9 (the input time at this time is t ₁ ),
The detection time t _O preset in the abnormal temperature control means 9 is compared with the input time t ₁ , and if the expression (4) is satisfied, the process proceeds to step 1; otherwise, the process proceeds to step i.

t _O T ₁ (4) In step l, the abnormal temperature control means 9 controls the lamp 10
And signals 11 and 11 to the buzzer 11 and the lamp 10
Turn on the buzzer 11. Then, the logic returns to step b, and this control is repeated thereafter.

Problems to be Solved by the Invention However, in the configuration as described above, there is a possibility that an erroneous determination may be made when the variable resistor 2 is operated, and further, when the temperature is determined to be abnormal, including the erroneous determination. Until the condition is resolved, the buzzer 11, the warning by the lamp 10,
There was a problem of giving uncomfortable feeling.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a self-diagnosis device for a showcase that does not cause erroneous detection and issues an alarm only in an appropriate period by an appropriate method.

Means for Solving the Problems In order to achieve this object, a self-diagnosis device for a showcase according to the present invention comprises a temperature detector for detecting an inside temperature of the showcase, and a variable resistor for setting a control temperature in the cabinet. A control temperature determining unit that receives a signal of the variable resistor, an abnormal temperature determining unit that receives a signal of the control temperature determining unit,
An abnormal temperature comparing means that receives a signal from the abnormal temperature determining means, an abnormal temperature comparing means, an abnormal temperature storing means for receiving and transmitting an input / output signal, and a signal from the temperature detector and the abnormal temperature comparing means. It comprises an abnormal temperature detecting means and a detection timer to which signals of the abnormal temperature detecting means are inputted, and a signal of the detecting timer to be inputted, and comprises an abnormal temperature alarm means.

Operation With this configuration, when the signal of the abnormal temperature determining means changes by a certain amount or more due to the operation of the variable resistor, the abnormal temperature detection is reset.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a self-diagnosis device of a showcase in one embodiment of the present invention, and FIG. 2 is a flowchart of a self-diagnosis device of a showcase in one embodiment of the present invention.

In FIG. 1, reference numeral 12 denotes a temperature detector for detecting the temperature inside the showcase, 13 denotes a variable resistor for setting a control temperature,
Reference numeral 14 denotes a control temperature determining unit that inputs a signal from the variable resistor 13. 15 is a temperature control means, 16 is a load such as a compressor, and the temperature control means 15 is a temperature detector 12 and a variable resistor.
The load 16 is controlled by inputting the signal 13.

17 is a control temperature storage means, and 18 is a control temperature comparison means. The control temperature comparing means 18 receives the signal from the control temperature determining means 14 and also receives the signal from the control temperature storing means 18, compares the signals, and outputs the result to the control temperature storing means 18.

Reference numeral 19 denotes a sampling timer for inputting a signal of the control temperature comparing means 18. Reference numeral 20 denotes an abnormal temperature determination circuit to which signals from the sampling timer 19 and the control temperature storage means 17 are input. Reference numeral 21 denotes an abnormal temperature determining means, a control temperature storing means 17, a control temperature comparing means 18, a sampling timer 19, and an abnormal temperature determining circuit 20.
Consists of

22 is an abnormal temperature storage means and 23 is an abnormal temperature comparison means. The abnormal temperature comparing means 23 inputs and compares the signals of the abnormal temperature determining circuit 20 and the abnormal temperature storing means 22 and outputs the result to the abnormal temperature storing means 22. Reference numeral 24 denotes a lock timer to which a signal from the abnormal temperature comparison means 23 is input. 25 is an abnormal temperature detecting circuit, a lock timer 24 and an abnormal temperature determining circuit.
Input 20 signals. 26 is an abnormal temperature detecting means, which comprises an abnormal temperature detecting circuit 25 and a lock timer 24.

27 is a detection timer to which the signal of the abnormal temperature detection circuit 25 is input. Reference numeral 28 denotes an abnormal temperature control means, which inputs a signal of the detection timer 27 and a signal of the lock timer 24. 29 is a reset switch for resetting the alarm. 30 is a self-diagnosis output control means, 31 is a lamp, and 32 is a buzzer. The self-diagnosis output control means 30 includes an abnormal temperature control means 28 and a reset switch 29.
And outputs signals to the lamp 31 and the buzzer 32. Numeral 33 denotes alarm means, which comprises abnormal temperature control means 28, reset switch 29, self-diagnosis output control means 30, lamp 31, and buzzer 32.

The operation of the temperature control device configured as described above will be described below with reference to the flowchart of FIG.

First, when the power is turned on, in step 1, the sampling timer 19, the lock timer 24, and the detection timer 27 are reset. Next, in step 2, and inputs the signal S ₁₂ from the temperature detector 12 to the temperature control unit 15 (the input temperature at this time is T _3). Then input at Step 3 the signal S ₁₃ from the variable resistor 13 to control temperature determining means 14 (an input temperature at this time is T _4). In step 4, enter the signal S ₁₂ from the signal S ₁₄ and the temperature detector 12 from the controlled temperature determining means 14 to the temperature control unit 15 compares the input temperature T ₃ and T ₉ (5) expression Mitsuru long as, when the load 16 is otherwise the oN order to OFF, the output signal S ₁₅ from the temperature control unit 15 to the load 16 (step 5).

T ₄ T ₃ ... (5) Next, the timer count of the sampling timer 19 is started in step 6, and the signal S ₁₆ (input temperature T ₄ ) is sent from the control temperature storage means 17 to the control temperature determination means 14 in step 7. Signal S
₁₇ Type of (the input temperature and T ₅₎ to control the temperature comparing means 18 compares the input temperature T ₄ and T _5, if the full (6) below, otherwise step to step 10 Advance the logic to 8. However if in first step after power T ₅ is not stored advances to step 8.

T ₅ = T ₄ (6) In step 8, the signal S ₁₉ from the control temperature comparing means 18
The input to the sampling timer 19, the timer is reset cans count, at step 9, and input from the control temperature comparing unit 18 a signal S ₁₈ to the control temperature storage unit 17 stores the input temperature T ₄ as the input temperature T ₅ , Return logic to step 2. Next, in step 10, the signal S _{20 is} output from the sampling timer 19.
(The input time at this time is t ₂ ) is the abnormal temperature determination circuit 20
The timer time t ₃ preset in the abnormal temperature determination circuit 20 is compared with the input time t ₂ , and if the equation (7) is satisfied, the process proceeds to step 11.
Advance the logic to

t ₂ T ₃ (7) In step 11, the signal S ₂₁ (input temperature T ₅ ) is input from the control temperature storage means 17 to the abnormal temperature determination circuit 20, and (8)
Abnormal temperature T ₆ is determined in accordance with Equation.

T ₆ = T ₅ + K ₂ (8) (K ₂ : a predetermined constant) Next, at step 12, the abnormal temperature comparing means 23 sends the signal S ₂₂ from the abnormal temperature determination circuit 20 (the abnormal temperature T ₆₎ receives the signal S ₂₃ from the abnormal temperature storage unit 22 (the input temperature T _7), (if otherwise to step 15 if 9) be satisfied, advances the logic to step 13 . However if in first step after power T ₇ is not stored advances to step 13.

T ₇ −T ₆ K ₃ (9) (K ₃ : a predetermined constant) In step 13, the signal S of the abnormal temperature comparing means 23
₂₄ is input to the lock timer 24, the timer count is reset, and the logic proceeds to step 16. In step 14, abnormal temperature comparison means 23 signals S ₂₄ and the signal S ₂₅ from, respectively,
The count value is input to the lock timer 24 and the abnormal temperature storage means 22 to start the count operation of the lock timer 24 (if the count operation has already been performed, continue), and the abnormal temperature T ₆
The stored as input temperature T ₇ of abnormal temperature storage unit 22.

In step 15, the timer count of the lock timer 24 is checked, and if expression (10) is satisfied, step
If not, go to step 17.

t ₄ t ₅ (10) (t ₄ : timer time of the lock timer) (t ₅ : preset timer time) Next, in step 17, the signal S ₂₆ is input from the lock timer 24 to the abnormal temperature control means 28. Self-diagnosis output control means 3
Through 0, the lamp 31 and the buzzer 32 are turned off, and the logic returns to step 2. In step 16, the abnormal temperature detection circuit
25, a signal S ₂₇ from the abnormal temperature determination circuit 20 (abnormal temperature
T ₆ ), the signal S ₂₈ (input temperature T ₃ ) from the temperature detector 12 and the signal S ₂₉ from the lock timer 24 are input, and the abnormal temperature T ₆ is compared with the input temperature T ₃ to satisfy the equation (11). If so, step
Go to 19 otherwise proceed to step 18.

T ₆ T ₃ (11) In step 18, the signal S ₃₀ is input from the abnormal temperature detection circuit 25 to the detection timer 27, the timer count of the detection timer is reset, and the logic proceeds to step 17. Next step
In 19, abnormal temperature detection circuit 25 signals S ₃₀ from the detection timer 2
7 and the detection timer 27 starts the timer counting operation. (Continue if counting has already been performed.) Next, in step 20, the detection timer 27
₃₁ (this is referred to as input time t ₆ ) is input to the abnormal temperature control circuit 28, and the preset timer time t ₇ is compared with the input time t ₆ , and if formula (12) is satisfied, the process proceeds to step 21. Otherwise, the logic proceeds to step 17.

In step 21, the signal S ₃₂ than abnormal temperature control means 28 and input to the diagnostic output control unit 30, and outputs a signal S _33, S ₃₄ to the lamp 31 and the buzzer 33 turned ON. In step 22, receives the signal S ₃₅ from the reset switch 29 to the diagnostic output control unit 30, the reset switch 29 is 1
It is determined whether or not the switch has been pushed, and the reset switch 29 is set to 1
If pushed, go to step 23, otherwise go to step 2.

In step 23, the signal S ₃₄ to turn OFF the buzzer from the diagnostic output control unit 30 is output, advances the logic to step 2.

As described above, according to the present embodiment, when the temperature detected by the temperature detector 12 is higher than the abnormal temperature, not only an alarm is issued, but also when the control temperature in the refrigerator is changed by a certain amount or more by operating the variable resistor 13. In this case, a lock timer is provided to reset the abnormality detection and not perform the abnormal temperature detection until the temperature is controlled to the changed temperature, thereby preventing erroneous detection. In addition, a sampling timer is provided for the operation of the variable resistor 13 in a mischievous manner, so that the self-diagnosis can be performed correctly without resetting the abnormal temperature detection unnecessarily. Further, only the buzzer can be turned off by the reset switch, so that the alarm by the buzzer 32 is not always continued during abnormal temperature continuation, and the discomfort can be eliminated. Further, since the lamp 33 is continuously displayed, it is not forgotten that the lamp 33 is abnormal by turning off the buzzer.

Effects of the Invention As described above, the present invention provides a temperature detector that detects the temperature in a refrigerator, a variable resistor that sets a control temperature in the refrigerator, and a control temperature determination unit that receives a signal from the variable resistor as an input. An abnormal temperature determining unit that receives a signal of the control temperature determining unit, an abnormal temperature comparing unit that receives a signal of the abnormal temperature determining unit,
An abnormal temperature comparing means, an abnormal temperature storing means for transmitting and receiving an input / output signal, a detection timer for inputting signals of the temperature detector and the abnormal temperature comparing means, and an abnormal temperature alarm means for inputting a signal of the detecting timer. With this configuration, when the control temperature is changed by a certain amount or more by operating the variable resistor, abnormal temperature detection can be reset to prevent erroneous detection. or,
A control temperature comparison unit that inputs the signal of the control temperature determination unit to the abnormal temperature determination unit, a control temperature storage unit that performs transmission and reception of the control temperature comparison unit and the input / output signal, and inputs a signal of the control temperature comparison unit. And an abnormal temperature determination circuit that receives signals from the control temperature storage unit and the sampling timer, and outputs signals to the abnormal temperature storage unit, the abnormal temperature detection unit, and the abnormal temperature comparison unit. In addition, it is possible to prevent the abnormal temperature detection from being reset due to the mischievous operation of the variable resistor.

Further, the signal of the abnormal temperature comparing means is inputted to the abnormal temperature detecting means. When a lock timer, an abnormal temperature determination means and a signal of the lock timer are input and an abnormal temperature detection circuit that outputs a signal to the detection timer is provided, when the abnormality detection is reset by operating the variable resistor, Until the inside of the refrigerator is controlled to the changed temperature, the abnormal temperature detection can be ignored, and erroneous detection can be prevented.

Further, the abnormal temperature alarm means includes a reset switch for resetting an alarm, an abnormal temperature control means for inputting a signal of a detection timer, a self-diagnosis output control means for inputting signals of the reset switch and the abnormal temperature control means. By using the signal of the self-diagnosis output control means as an input and having a lamp and a buzzer for giving an alarm, it is possible to prevent discomfort that the alarm by the buzzer always continues during the abnormal temperature, and its effect Is enormous.

[Brief description of the drawings]

FIG. 1 is a block diagram of a showcase self-diagnosis device in one embodiment of the present invention, FIG. 2 is an operation flowchart of the showcase self-diagnosis device in one embodiment of the present invention, and FIG. 3 is a conventional showcase. FIG. 4 is a block diagram of the self-diagnosis device, and FIG. 4 is an operation flowchart of the conventional showcase self-diagnosis device. 12: Temperature detector, 13: Variable resistor, 14: Control temperature determination means, 17: Control temperature storage means, 18: Control temperature comparison means, 19: Sampling timer, 20: Abnormal temperature determination Circuit, 21 ... abnormal temperature determination means, 22 ... abnormal temperature storage means, 23 ... abnormal temperature comparison means, 24 ... lock timer,
25: abnormal temperature detection circuit, 26: abnormal temperature detection means, 27
... Detection timer, 28 ... Abnormal temperature control means, 29 ... Reset switch, 30 ... Self-diagnosis output control means, 31 ... Lamp, 32 ... Buzzer, 33 ... Alarm means.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F25D 11/00 101 F25D 23/00 301

Claims (4)

(57) [Claims] 1. A temperature detector for detecting a temperature in a refrigerator of a showcase, a variable resistor for setting a control temperature in the refrigerator, a control temperature determining means for inputting a signal of the variable resistor, and a control temperature determining device. Abnormal temperature determining means for inputting a signal of the means, abnormal temperature comparing means for inputting a signal of the abnormal temperature determining means, abnormal temperature comparing means for receiving the abnormal temperature comparing means and input / output signals, temperature detecting means, Of a showcase including an abnormal temperature detecting means for inputting a signal of the detector and the abnormal temperature comparing means, a detecting timer for inputting a signal of the abnormal temperature detecting means, and an abnormal temperature alarming means for inputting a signal of the detecting timer. Diagnostic device. 2. A control temperature comparing means for inputting a signal from a control temperature determining means as the abnormal temperature determining means, a control temperature storing means for transmitting and receiving an input / output signal to and from the control temperature comparing means, and a control temperature comparing means. And an abnormal temperature determination circuit that receives the signals of the control temperature storage means and the sampling timer, and outputs signals to the abnormal temperature storage means, the abnormal temperature detection means, and the abnormal temperature comparison means. The self-diagnosis device for a showcase according to claim 1, wherein: 3. An abnormal temperature detecting means for inputting a signal of an abnormal temperature comparing means as an abnormal temperature detecting means, receiving a signal of a lock timer and an abnormal temperature determining means and a signal of a lock timer, and outputting a signal to a detecting timer. The self-diagnosis device for a showcase according to claim 1, further comprising a circuit. 4. An abnormal temperature alarm means, wherein a reset switch for resetting an alarm and a signal of a detection timer are inputted, and a self-diagnosis output control which receives signals of the reset switch and the abnormal temperature control means. 2. The showcase self-diagnosis device according to claim 1, further comprising a means, a lamp and a buzzer for inputting a signal of the self-diagnosis output control means and issuing an alarm.