JPH06288666A - Control device for compressor cooling fan motor of refrigerator - Google Patents

Abstract

PURPOSE:To protect the performance of a compressor from being degraded and save energy as well by driving a compressor cooling fan only when required. CONSTITUTION:A microcomputer 3 is provided with an on-timer which records a continuous operation time of a compressor 1 and an off-timer 5 which counts a continuous shut down time of the compressor. When driving the compressor 1, it is necessary to drive a fan motor 2 if an open air temperature detected by an open air temperature sensor 6 exceeds an operation requirement temperature. The operation requirement temperature is computed from a fuzzy inherence, using the continuous operation time and the continuous shut down operation time detected by the timers 4 and 5 as an input condition and set accordingly. The fuzzy control rule is set so that it may be a lower value as the continuous operation time is longer while it may be a higher value as the continuous shut down time is longer. This construction makes it possible to eliminate the waste of time when driving the fan motor 2 and save power and prevent the performance of the compressor from being degraded by operating the fan motor 2 only when required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of a cooling fan motor for a compressor of a refrigerator in which the cooling fan motor is controlled in synchronism with the operation of the compressor when the outside air temperature is higher than the operating condition temperature. Regarding the device.

[0002]

2. Description of the Related Art A compressor cooling fan motor (hereinafter referred to as a fan motor) used in a refrigerator cooling device is operated in synchronization with the operation of the compressor to cool the compressor when the outside air temperature is high. It is like this. When the outside air temperature is low, the cooling by the cooling fan is not necessary, so the operation is stopped. In this case, specifically, the outside air temperature is detected, and the fan motor is operated when the temperature is equal to or higher than the preset operating condition temperature, and the fan motor is stopped when the temperature is lower than the operating condition temperature. There is. As a result, the compressor is appropriately cooled according to the outside air temperature, and power is saved.

[0003]

By the way, in the refrigerator of the refrigerator, for example, there is an operation mode for enhancing the cooling capacity such as setting of the quick freezing mode. In this mode, the compressor is operated continuously for a long time. Become so. Then, in such a case, even if the outside air temperature is lower than the operating condition temperature and the fan motor is not operated, the fan motor is operated to forcibly cool the compressor. There may be a need. That is, if the compressor is continuously operated for a long time with the fan motor stopped, not only the cooling capacity of the cooling device may decrease, but also the performance of the compressor may deteriorate and the reliability may decrease. Because there is.

Therefore, in order to eliminate such a problem,
Conventionally, for example, the operating condition temperature is set to a low value in advance, but in this case, conversely, in the case where the compressor is normally operated, forced cooling is not necessary. Even if the temperature is high, the fan motor will be operated, and there is a problem that power is wasted.

The present invention has been made in view of the above circumstances, and an object thereof is to control a cooling fan motor for a compressor of a refrigerator in which a fan motor for a compressor can be operated under necessary conditions. To provide the equipment.

[0006]

SUMMARY OF THE INVENTION The present invention provides a controller for a cooling fan motor for a compressor of a refrigerator for controlling the operation of the cooling fan motor in synchronization with the operation of the compressor when the outside air temperature is equal to or higher than the operating condition temperature. And a first time measuring means for measuring the continuous operation time of the compressor, a second time measuring means for measuring the continuous stop time of the compressor, and a first time measuring means. By using the continuous operation time of the compressor and the continuous stop time of the compressor indicated by the second timing means as input conditions, and performing an operation based on fuzzy inference according to a preset fuzzy control rule. , Set the operating condition temperature to a lower value as the continuous operating time increases, and set the operating condition temperature to a higher value as the continuous stop time increases. Characterized in was constructed by providing and setting means for setting.

[0007]

According to the controller of the cooling fan motor for the compressor of the refrigerator of the present invention, the setting means is clocked by the first and second timing means when the drive signal of the compressor is output. The operation condition temperature is set by executing the operation based on the fuzzy inference according to the preset fuzzy control rules with the continuous operation time and the continuous stop time of the compressor as input conditions, and the operation in which the outside air temperature is set When the temperature exceeds the condition temperature, the compressor cooling fan motor is operated in synchronization with the operation of the compressor.

At this time, when setting the operating condition temperature by fuzzy reasoning, the setting means sets the operating condition temperature to a lower value as the continuous operating time of the compressor becomes longer, and the continuous stop time is set. Is based on a fuzzy control rule that sets the operating condition temperature to a higher value.

As a result, when the continuous operation time of the compressor tends to be longer than the continuous stop time, the operating condition temperature is set to a low value accordingly,
Even when the outside air temperature is low, the compressor can be forcedly cooled by operating the compressor cooling fan motor.
On the other hand, in the opposite case, the operating condition temperature is set to a high value, so that forced cooling of the compressor is not necessary, so only natural cooling is performed even when the outside air temperature is relatively high. It becomes possible to suppress unnecessary power consumption.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a drive control system of a compressor 1 of a cooling device and a cooling fan motor 2 for a compressor in a control system of a refrigerator main body (not shown). A microcomputer 3 as a setting means is a CPU. , ROM, R
The control program, which will be described later, is stored in advance, and includes an on-timer 4 and an off-timer 5 as first and second timing means.

The compressor 1 and the fan motor 2 for compressing the refrigerant of the cooling device are connected to the output terminals of the microcomputer 3 via drive circuits 1a and 1b, respectively. The outside air temperature sensor 6 for detecting the outside air temperature is connected to the input terminal of the microcomputer 3 and provides an outside air temperature detection signal. The freezer sensor 7 detects the temperature in the freezer compartment, and its output terminal is connected to the input terminal of the microcomputer 3 so as to provide it as an internal temperature detection signal. The microcomputer 3 sends a drive signal for instructing the operation of the cooling device, that is, the operation of the compressor 1 based on the internal temperature detection signal.
It is designed to output to.

Next, the operation of this embodiment will be described with reference to FIGS. 2 and 3. FIG. 2 shows a flowchart of a program of the microcomputer 3 for controlling the drive of the fan motor 2, and the microcomputer 3 executes this program at an appropriate timing. Based on the internal temperature detection signal from the freezer sensor 7, the microcomputer 3 determines "NO" in step S1 when the cooling device does not need to be operated, that is, when the compressor 1 is not operated. The fan motor 2 is held in a stopped state (step S
2).

Further, when the microcomputer 3 determines that it is necessary to operate the cooling device based on the internal temperature detection signal from the freezer sensor 7, it sends a drive signal to the compressor 1 via the drive circuit 1a. Is given to start the operation, and "YES" is determined in step S1 and the process proceeds to step S3. The microcomputer 3 executes step S
At 3, it is determined whether or not the value of the outside air temperature Ta detected by the outside air temperature sensor 6 is equal to or higher than the operating condition temperature Tc set by another program not shown. In this case, as will be described later, the operating condition temperature Tc is set by the microcomputer 3 in advance based on the fuzzy logic that is the previous continuous operating time Ton and continuous stopping time Toff of the compressor 1 by the on-timer 4 and the off-timer 5 as input conditions. It is set by executing an operation based on fuzzy inference according to a control rule.

The microcomputer 3 has an outside air temperature Ta.
Is equal to or higher than the operating condition temperature Tc, the determination is "YES" and the process proceeds to step S4, where a drive signal is given to the fan motor 2 via the drive circuit 2a to start the operation. On the other hand, when the outside air temperature Ta is lower than the operating condition temperature Tc, the microcomputer 3 determines “NO”, and proceeds to step S2 to stop the operation of the fan motor 2 (if it is in the stopped state, stop the stopped state). Hold.

Now, the microcomputer 3 sets the value of the operating condition temperature Tc by executing the calculation based on the fuzzy inference as follows. That is, the previous continuous operation time Ton measured by the on-timer 4 is “short”, “short”, as shown in FIG.
The degree is quantitatively expressed by five membership functions of "medium", "long" and "long". The previous continuous stop time Toff measured by the off timer 5 is "short", "short", as shown in FIG. 3 (b), for example.
The degree is quantitatively expressed by five membership functions of "medium", "long" and "long". The operating condition temperature Tc determined by the values of these operating times Ton and Toff is five members of "low", "low", "standard", "high" and "high" shown in FIG. 3 (c). It is designed to be calculated from the ship function.

The values obtained by each of these membership functions are calculated according to the fuzzy control rule table shown below. The fuzzy control rule table is set to lower the operating condition temperature Tc as the continuous operating time Ton becomes longer, and to set the operating condition temperature Tc higher as the continuous operating time Toff becomes longer. It is a thing.

[0017]

[Table 1]

Now, the case where the continuous operation time by the on-timer 4 is Ton1 shown in FIG. 9A and the continuous stop time by the off-timer 5 is Toff1 shown in FIG. That is, in the continuous operation time Ton1, the value of the "medium" level is a, the value of the "longer" level is b, and the values of the other levels are zero.
At the continuous stop time Toff 1, the value of the “short” level is c, the value of the “medium” level is d, and the values of the other levels are zero.

Then, when the corresponding membership function of the operating condition temperature Tc is obtained from the above fuzzy control rule table, for example, the continuous operating time Ton is "medium" and the continuous stop time Toff is "medium". The "standard" level is selected, and the corresponding membership function of the operating condition temperature Tc is selected as "low" level corresponding to "medium" of the continuous operation time Ton and "short" of the continuous stop time Toff. can do. Similarly, for the "longer" continuous operation time Ton, the "lower" level and the "lower" level are selected corresponding to the "intermediate" and "shorter" continuous stop times Toff.

Next, with respect to the value of the selected level, the value "a", "b", "c", "d" of the continuous operation time Ton1 and the continuous stop time Toff1 is used to calculate " Values corresponding to the "low", "low" and "standard" levels are obtained and the values of the membership function shown in FIG. Operating condition temperature Tc to be obtained
Is the vertical line drawn from the center of gravity P of the area (indicated by the shaded area in the figure) of the area where the areas below the values plotted in each membership function are added to the horizontal axis (axis of operating condition temperature Tc). The temperature Tc1 indicated by the position is reached.

According to this embodiment, the microcomputer 3 sets the operating condition temperature Tc, which is the lower limit value when the fan motor 2 is operated in synchronization with the operation of the compressor 1, by the microcomputer 3. The previous continuous operation time Ton and continuous stop time Toff of the compressor 1 timed by the off timer 5 are set by executing a calculation based on fuzzy inference according to a fuzzy control rule table set in advance as an input condition. Therefore, the fan motor 2 can be appropriately operated under the necessary conditions corresponding to the operating state of the compressor 1, performance deterioration of the compressor 1 can be prevented, and reliability can be improved.
Power saving can be achieved by not operating the fan motor 2 unnecessarily.

In the above embodiment, the membership function in which the continuous operating time Ton and the continuous stop time Toff of the compressor 1 are divided into 5 stages is used, and the operating condition temperature Tc is divided into 5 stages. I explained about the case of fuzzy inference by, but not limited to this,
The level of the membership function can be set at an appropriate level.

[0023]

As described above, according to the control device for the cooling fan motor for the compressor of the refrigerator of the present invention, the continuous operating time of the compressor indicated by the first and second timing means by the setting means. By setting the continuous stop time as an input condition and executing a calculation based on fuzzy inference according to a preset fuzzy control rule, the operating condition temperature is set to a lower value as the continuous operating time becomes longer. Since the operating condition temperature is set to become a higher value as the continuous stop time becomes longer, when the continuous operating time of the compressor tends to be larger than the continuous stop time, the operating condition temperature is correspondingly increased. Is set to a low value and the cooling fan motor for the compressor is operated to forcibly cool the compressor to prevent performance deterioration even when the outside air temperature is low. It is possible to improve the reliability,
In the opposite case, set the operating condition temperature to a high value,
This has an excellent effect that power consumption can be reduced by suppressing unnecessary power consumption when the outside air temperature is relatively high.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a control system showing an embodiment of the present invention.

FIG. 2 is a flowchart of a program showing control contents

[Figure 3] Membership functions of operating time, stop time, and operating ambient temperature

[Explanation of symbols]

1 is a compressor, 2 is a fan motor (compressor cooling fan motor), 3 is a microcomputer (setting means), 4 is an on-timer (first time measuring means), 5 is an off-timer (second)
6) is an outside air temperature sensor, and 7 is a freezer sensor.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location // G05B 13/02 N 9131-3H

Claims (1)

[Claims] 1. A cooling fan motor is controlled to operate in synchronism with the operation of the compressor when the outside air temperature is equal to or higher than an operating condition temperature, and a first continuous operation time of the compressor is measured. Time measuring means, second time measuring means for measuring the continuous stop time of the compressor, continuous operation time of the compressor indicated by the first time measuring means, and the compressor indicated by the second time measuring means By setting the continuous stop time and the input stop condition as input conditions and executing a calculation based on fuzzy inference according to a preset fuzzy control rule, the operating condition temperature is set to a lower value as the continuous operating time becomes longer. And a setting means for setting the operating condition temperature to a higher value as the continuous stop time becomes longer. Fan motor controller.