JP2005090912A - Controller for refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect the abnormality of a fan motor causing severance of wire, lock, etc. in such the case that the number of revolutions set by the fan motor is different from the actual number of revolutions. <P>SOLUTION: This refrigerator comprises an in-refrigeration fan motor 1 and a machine room fan motor 2 and it also comprises a controller adjusting the voltage applied to the fan motor and executing control on the number of revolutions. The controller comprises an in-refrigerator fan motor revolution number detecting means 6 for detecting the number of revolutions of the machine room fan motor 2 and a fan motor control means 7 for controlling the fan motor, and it can determine the abnormality of the fan motor from the difference between the detected number of revolutions of fan motor and the number of set revolutions. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a refrigerator that includes a fan motor and includes a control device that controls a rotational speed by adjusting a voltage applied to the fan motor.

  Conventionally, as this type of refrigerator control device, there is one that detects an abnormality of a fan motor by current detection and issues an alarm (see, for example, Patent Document 1).

  Hereinafter, the conventional refrigerator control device will be described with reference to the drawings.

FIG. 3 is an electric circuit diagram of a conventional refrigerator abnormality detection device. As shown in FIG. 3, in the conventional refrigerator abnormality detection device, the internal fan motor drive circuit 102 that varies the voltage applied to the internal fan motor 101 and the condensing fan motor that varies the voltage applied to the condensing fan motor 103. A drive circuit 104 and a current detection circuit 105 that detects the currents of the two fan motors are included. By comparing the detected current value with a preset current value, the fan motor is disconnected or motor-locked. And the like, the corresponding fan is specified, and the notification means notifies the abnormality.
Japanese Patent Laid-Open No. 10-259981

  However, in the above-described conventional configuration, an abnormality such as disconnection or motor lock of the fan motor can be detected, but an abnormality up to disconnection or lock cannot be detected when the set rotation speed is different from the actual rotation speed. Had.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a refrigerator control device that can detect an abnormality in the rotational state of a fan motor.

  In order to solve the above-described conventional problems, a refrigerator control device of the present invention includes a fan motor, and a refrigerator including a control device that adjusts a voltage to be applied to the fan motor and executes rotation speed control. The control device includes rotation speed detection means for detecting the rotation speed of the fan motor, and fan motor control means for controlling the fan motor, and the fan motor speed is determined by a difference between the detected fan motor rotation speed and the set rotation speed. It is configured to make an abnormality determination.

  This makes it possible to reliably detect an abnormality in the fan motor.

  The refrigerator control device of the present invention can reliably detect and notify abnormality including the rotation state of the fan motor by detecting the difference between the fan motor rotation speed and the set rotation speed.

  The invention according to claim 1 is a refrigerator including a fan motor, and a control device that performs a rotational speed control by adjusting a voltage applied to the fan motor, wherein the control device determines the rotational speed of the fan motor. A rotation speed detection means for detecting and a fan motor control means for controlling the fan motor, wherein a fan motor abnormality is determined based on a difference between the detected fan motor rotation speed and a set rotation speed; It is possible to reliably detect abnormalities including the rotation state.

  According to a second aspect of the present invention, in the first aspect of the present invention, a notification means is provided, and when the fan motor abnormality is detected, the notification means is operated to notify the abnormality, and the user can be notified of the abnormality quickly. it can.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the rotational speed of the fan motor is detected based on an average value of a constant period of the rotational speed detected by the rotational speed detecting means. The number detection accuracy is improved and erroneous detection can be prevented.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein an upper limit value and a lower limit value of the rotational speed detected by the rotational speed detection means are provided, and the upper limit value or more is provided. Alternatively, the fan speed is detected by obtaining an average value for a certain period based on the rotation speed detection value other than the lower limit value. If the rotation speed signal is disturbed due to noise, etc., erroneous detection of the rotation speed is prevented. can do.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the fan motor is forcibly operated at a specified rotational speed for a certain period of time, and the rotational speed of the fan motor is reduced. After the stabilization, the rotational speed of the fan motor is detected by the rotational speed detection means. After the rotational speed is stabilized, the rotational speed of the fan motor is detected by the rotational speed detection means. It is possible to prevent erroneous detection of the rotational speed due to the rotational speed variation at the start.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments. In addition, the same components as those in the related art are denoted by the same reference numerals, and detailed description thereof is omitted.

(Embodiment 1)
FIG. 1 is a block diagram of a control device for a refrigerator in Embodiment 1 of the present invention, and FIG. 2 is a flowchart showing the operation, which will be described below with reference to FIGS.

  In FIG. 1, the internal fan motor 1 performs cool air circulation in the refrigerator, and the machine room fan motor 2 is installed in the machine room and performs air cooling of the compressor. The internal fan motor driving means 3 drives the internal fan motor 1, and the machine room fan motor driving means 4 drives the machine room fan motor 2. The internal fan motor rotational speed detection means 5 detects the rotational speed of the internal fan motor 1, and the machine room fan motor rotational speed detection means 6 detects the rotational speed of the mechanical room fan motor 2. The fan motor control means 7 controls the operating states of the internal fan motor 1 and the machine room fan motor 2. The notification unit 8 displays a warning display on the display unit 9 when an abnormality of the internal fan motor 1 and the machine room fan motor 2 is detected by the fan motor control unit.

  The operation of the refrigerator control apparatus configured as described above will be described with reference to FIG. Since the method of detecting the number of revolutions of the internal fan motor 1 and the machine room fan motor 2 is the same, the internal fan motor 1 will be described, and the description of the mechanical room fan motor 2 will be omitted.

  First, when the fan is ON in step 100, the process proceeds to step 101, where the internal fan motor rotational speed detecting means detects the internal fan motor rotational speed. Next, in step 102, the fan motor control means 7 compares the set rotational speed with the detected current rotational speed, and the difference between the set rotational speed and the detected current rotational speed is a comparison value (for example, the set rotational speed) If it is determined that the fan motor rotation abnormality is 30% or more, if it is greater than 30% of the set rotation speed), the routine proceeds to step 103, where it is determined that the rotation speed is abnormal. In step 102, if the difference between the set rotational speed and the detected current rotational speed is smaller than the comparison value used for abnormality determination, the routine proceeds to step 104, where it is determined that the rotational speed is normal.

  As described above, the abnormality including the rotational state of the fan motor is reliably detected by determining the abnormality of the fan motor based on the difference between the rotational speed of the fan motor detected by the rotational speed detection means and the set rotational speed. Can do.

  In step 102, the fan motor control means 7 compares the set rotational speed with the detected current rotational speed. If the difference between the set rotational speed and the detected current rotational speed is larger than the comparison value used for abnormality determination, the process proceeds to step 103. It is determined that the rotation speed is abnormal. Next, the process proceeds to step 200 where a warning display is output to the display means 9 by the notification means 8.

  As described above, the abnormality of the fan motor is determined based on the difference between the fan motor rotation speed detected by the rotation speed detection means and the set rotation speed. When an abnormality is detected, a warning display is displayed on the display means 9 by the notification means. Can display and inform.

  In step 101, the internal fan motor rotational speed detection means detects the internal fan motor rotational speed, and in step 300, the rotational speed detection value is added. Next, in step 301, it is determined whether or not the rotation speed detection operation has passed a certain period. If not, rotation speed detection is continued in step 101. When the fixed period has passed in step 301, the process proceeds to step 302, and the rotation speed detection value added in step 300 is divided by the number of periods to obtain an average value of the rotation speed detection values.

  As described above, the rotational speed detection accuracy can be improved by detecting the rotational speed of the fan motor from the average value of the rotational speeds of a fixed period detected by the rotational speed detection means.

  Further, in step 101, the internal fan motor rotational speed detection means detects the internal fan motor rotational speed, and in step 400, the rotational speed detection value is compared with the detection upper limit value. The detection value is not added. When the rotational speed detection value is less than the upper limit value at step 400, it is compared with the detection lower limit value at step 401, and when it is equal to or lower than the lower limit value, the rotational speed detection value is not added. If the rotational speed detection value is smaller than the upper limit value and larger than the lower limit value in step 401, the rotational speed detection value is added in step 300. When the fixed period has passed in step 301, the process proceeds to step 302, and the rotation speed detection value added in step 300 is divided by the number of periods to obtain an average value of the rotation speed detection values.

  As described above, the upper limit value and the lower limit value of the rotation speed detection value are provided, and the fan motor rotation speed is detected by obtaining an average value for a certain period based on the rotation speed detection value other than the upper limit value or the lower limit value or less. Thus, erroneous detection of the rotational speed when the rotational speed signal is disturbed due to noise or the like can be prevented.

  Further, when the fan is ON in step 100, the process proceeds to step 500, where it is determined whether a certain time has elapsed, and if the certain time has not elapsed, step 500 is repeated to wait. When a predetermined time has passed in step 500, the process proceeds to step 101, and the rotation speed is detected.

  As described above, the fan motor is operated at a constant command rotation number forcibly for a certain period of time to stabilize the rotation number, and then the rotation number of the fan motor is detected by the rotation number detection means. It is possible to prevent erroneous detection of the rotational speed due to the rotational speed variation at the start of operation.

  As described above, the refrigerator control device according to the present invention can be used to determine the abnormality of the fan motor based on the difference between the fan motor rotation speed and the set rotation speed, and thus can be applied to all devices using the fan motor.

The block diagram of the control apparatus of the refrigerator in Embodiment 1 by this invention Flowchart of the refrigerator control device in Embodiment 1 according to the present invention. Electric circuit diagram of conventional refrigerator abnormality detection device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inside fan motor 2 Machine room fan motor 4 Inside fan motor rotation speed detection means 5 Machine room fan motor rotation speed detection means 7 Fan motor control means 8 Notification means 9 Display means

Claims (5)

In a refrigerator comprising a fan motor, and a control device that executes a rotational speed control by adjusting a voltage applied to the fan motor, the control device detects a rotational speed of the fan motor; and A refrigerator control device comprising a fan motor control means for controlling a fan motor, and determining abnormality of the fan motor based on a difference between the detected fan motor rotation speed and a set rotation speed. The control device for a refrigerator according to claim 1, further comprising a notifying unit, wherein when the fan motor abnormality is detected, the notifying unit is operated to notify the abnormality. The control device for a refrigerator according to claim 1 or 2, wherein the number of rotations of the fan motor is detected based on an average value of a fixed period of the number of rotations detected by the rotation number detection means. An upper limit value and a lower limit value of the rotation speed detected by the rotation speed detection means are provided, and an average value of a certain period is obtained by a rotation speed detection value other than the upper limit value or the lower limit value to detect the rotation speed of the fan motor. The control apparatus of the refrigerator as described in any one of Claims 1-3. 5. The fan motor of claim 1 to claim 4, wherein the fan motor is operated at a constant command rotation speed for a certain period of time to stabilize the fan motor rotation speed, and then the rotation speed detection means detects the rotation speed of the fan motor. The control apparatus of the refrigerator as described in any one.

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