JPH056110B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a refrigerator control device that controls defrosting of a refrigerator.

[Prior Art] FIG. 1 is a sectional view schematically showing a conventional refrigerator-freezer. In the figure, 1 is a freezer compartment, 2 is a refrigerator,
A power supply section 3 supplies power to a control circuit section 6 and a drive circuit section 7 equipped with a microcomputer having an A/D conversion function. 4 is thermistor, 5
is a temperature detection section that converts the resistance change of the thermistor 4 into an electrical signal.

The drive circuit 7 is controlled by the control circuit section 6 to drive a compressor (hereinafter referred to as COMP) 8. 9 is a cooler, 10 is a motor, 11 is a fan driven by the motor 10, 12 is a thermistor that detects the defrosting temperature, and 13 is a heater that melts the frost attached to the cooler 9.

Next, the operation will be explained. The internal temperature of the freezer compartment 1 is detected by the temperature detection unit 5 from the resistance value of the thermistor 4, and this is read by the control circuit unit 6.
Decide whether to start or stop COMP8. COMP8
During operation, when the motor 10 is driven and the fan 11 is turned to forcefully circulate cold air to cool the inside of the refrigerator, the resistance of the thermistor 4 changes, and when the control circuit section 6 reaches the stop condition for COMP8, COMP8 is stopped. do. Repeat the above steps to remove freezer compartment 1.
maintain at a certain temperature. At this time, since frost adheres to the cooler 9, defrosting is performed to remove this frost.

Next, the defrost operation will be explained using the flowchart of defrost control shown in FIG. In step 14, the operating mode of COMP8 is determined, and if it is stopped, the process proceeds to step 15. In step 15, the data created by the microcomputer
If the operation integration timer T of COMP8 (hereinafter referred to as COMP8 integration timer or timer T in order to match the flowchart shown in FIG. 2) has elapsed for 12 hours, proceed to step 18. On the other hand, if COMP8 is in operation at step 14, the process advances to step 16, and if the timer T has not elapsed for 13 hours at step 16, the process advances to step 17, where COMP8 is in operation.
Advance the integration timer for a predetermined amount of time. On the other hand, if 13 hours have passed in step 16, step 1
8, in step 18, the thermistor 12
The temperature in the vicinity of the cooler is detected by the temperature detection circuit section 5 based on the resistance value, and this is read by the control circuit section 6. If it is the defrost entry temperature, the process proceeds to step 19.
In step 19, the COMP 8 is stopped, the motor 10 is stopped, the fan 11 is stopped, and the heater 13 is turned on to melt the frost attached to the cooler 9. On the other hand, if it is determined at step 18 that the temperature is not at the frost intake temperature, the process proceeds to step 20, and the process proceeds to step 2.
At 0, turn off the heater 13 and step 2
1, and in step 21, the COMP integration timer is reset.

[Problems to be solved by the invention] Since the conventional refrigerator defrost control device is configured as described above, the RAM of the microcomputer is reset when the power is turned on again or when there is an instantaneous power outage (hereinafter referred to as an instantaneous power outage). Because of this, the COMP8 operation integration timer is reset, and the interval between defrosting becomes longer, and more frost adheres to the cooler, which may reduce cooling capacity and increase power consumption. There were issues such as gender.

This invention was made in order to solve the above-mentioned problems, and prevents the possibility that the defrosting interval becomes longer when the power is turned on again or when there is a momentary power outage, and prevents the increase of frost adhering to the cooler. It is an object of the present invention to provide a refrigerator control device that can reduce the amount of electricity consumed, maintain a normal cooling capacity, and prevent an increase in power consumption.

[Means for Solving the Problems] A refrigerator control device according to the present invention includes a power supply detection means for detecting power-on, a timekeeping means for measuring the operating time of a compressor, and a refrigerator control device disposed in a freezer compartment, a first temperature detection means for detecting the temperature of
A refrigerator control device that controls the removal of frost attached to the cooler of the refrigerator, and usually detects the operating time measured by the timer and the second temperature detector. The defrosting control is performed according to the temperature of the cooler, and when the power is turned on, the time until the defrosting control is measured by the timer means can be changed according to the temperature of the freezer compartment detected by the first temperature detecting means. defrost control.

[Function] Normally, defrosting control is performed based on the operating time measured by the clock means and the temperature of the cooler detected by the second temperature detection means. Depending on the temperature
To make it possible to change the time until defrosting control measured by a timing means.

[Example] Hereinafter, an example of the refrigerator control device according to the present invention will be described.

The cross-sectional shape and basic control of the refrigerator in which the embodiment is installed are based on the conventional example described with reference to FIGS. 1 and 3, so redundant explanation will be omitted.
The control operation for starting defrosting, which is a feature of this embodiment, will be explained with reference to the flowchart shown in FIG.

When the power is turned on again or during a momentary power outage, the power-on is detected by creating a closed loop of the power-on time, and in step 10, the temperature of the freezer compartment 1 is
It is detected from the resistance value of the thermistor 4 placed in the freezer compartment 1, and read by the control circuit section 6, and the temperature is -10℃.
If it is below, proceed to step 11, set the COMP integration timer T to the value A, advance the timer count in advance, and proceed to the main loop. In the main loop, the temperature near the cooler 9 is detected from the resistance value of the thermistor 12, as shown in the flow chart of refrigerator defrost control shown in FIG.
It was read by the control circuit section 6 and proceeded.
Depending on the time of the COMP integration timer T, it is determined whether defrosting is to be performed or not.

In other words, when the power is turned on again after a short period of operation after a long period of operation, or when the power is turned on again after a momentary power outage, a considerable amount of frost is still attached to the cooler 9, and the temperature inside the freezer compartment 1 is low. Since the temperature is low and below the preset temperature, by advancing the initial value of the time measurement means such as the COMP integration timer T by a predetermined time and starting time measurement integration, the time integration value will be lower than when restarting after a long-term stop. By quickly reaching the predetermined cumulative time value, it is possible to start removing the adhering frost. Thereby, it is possible to prevent an abnormal increase in the adhesion of frost, prevent the cooling effect from decreasing excessively, maintain the temperature inside the refrigerator within a predetermined range, and efficiently cool the stored items.

In addition, in the above embodiment, it is stated that the COMP integration timer is shortened when the temperature of the freezer compartment 1 is -10°C or lower, but the temperature of the freezer compartment 1 is determined by detecting whether cooling operation has been performed previously. The temperature can be any degree as long as it is possible to detect that the cooling operation is being performed, and the same effect as in the above embodiment can be obtained.

Further, in the above embodiment, the COMP integration timer has one variable point, but any number of variable points may be provided, and the same operation and effect as in the above embodiment can be achieved.

[Effects of the Invention] According to the present invention, it is possible to prevent an abnormal increase in the adhesion of frost, prevent an excessive decrease in the cooling effect, maintain the temperature inside the refrigerator within a predetermined range, and more reliably perform defrosting control. As a result, food products can be well preserved without having any adverse effects on them.

Moreover, it can be implemented with only slight modifications to conventional equipment, without increasing costs or making the equipment complex or large, and can be easily implemented in home refrigerators. .

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an outline of a refrigerator-freezer, FIG. 2 is a flowchart of defrost control according to an embodiment of the present invention, and FIG. 3 is a flowchart of defrost control. Note that FIGS. 1 and 3 are common to the embodiment of the present invention and the prior art. In the figure, 1 is a freezer compartment, 4 is a thermistor, 5 is a temperature detection section, 6 is a control circuit equipped with a microcomputer having an A/D conversion function, 9 is a cooler, and 12 is a thermistor.

Claims (1)

[Claims] 1. A power supply detection means for detecting power-on, a timer for measuring the operating time of the compressor, a first temperature detection means disposed in the freezing compartment and detecting the temperature of the freezing compartment, and a first temperature detection means disposed near the cooler. and a second temperature detection means for detecting the defrosting temperature, the refrigerator control device controls the removal of frost attached to the cooler of the refrigerator, and usually the operating time is measured by the timer. Defrosting control is performed based on the temperature of the cooler detected by the second temperature detecting means, and when the power is turned on, the defrosting is measured by the clocking means based on the temperature of the freezer compartment detected by the first temperature detecting means. A refrigerator control device that performs defrosting control by being able to change the time until the control is performed.