JP2007139202A - Control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device capable of minimizing false detection by detecting failure parts with higher accuracy, without a user having to perform unnecessary maintenance and to feel anxiety on failure more than necessary. <P>SOLUTION: This control device of a water heater 100, 200 comprising a plurality of component devices, comprises a determining means for determining the failure of the component device, and a predetermined number setting means. The determining means has a function for detecting abnormality of the component device, temporarily stopping at least the component device on which the abnormality is detected, and restarting the same, counts the number of times of restarting, and determines the failure of the component device when the number of times of restarting reaches the predetermined number of times. The predetermined number setting means returns the number of times of restarting to the predetermined number when the temporarily-stopped component device is once normally operated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a control device such as a device or equipment, and more particularly to a control device for a hot water supply device, and is suitable for being applied to a control device for a heat pump type hot water supply device.

  A heat pump type hot water supply apparatus is a known apparatus, and there is a conventional technique proposed in this regard (for example, see Patent Document 1). In this prior art, it is possible to identify a failure location of the hot water supply apparatus. Patent Document 1 discloses means for detecting a failure when the number of times of stopping and restarting the compressor (compressor) reaches a predetermined number. However, when the outdoor fan stops rotating due to a strong wind such as a typhoon, the fan motor itself is not actually a failure, but it is erroneously detected as a failure on the control device side.

  Such problems of the prior art will be described with reference to FIGS. 11A and 11B. When it is normal during boiling, control is performed so that the target rotational speed (here, 600 rpm) is obtained as in A. However, for example, if the unstable state continues as in B due to strong wind, if the rotational speed of the outdoor fan is below a predetermined value (for example, 100 rpm), the system is detected to be abnormal and the compressor is stopped. Then, it restarts and the frequency | count is measured. If the unstable state continues even after restarting, the number of restarts reaches a predetermined value, so that a failure is detected (see FIG. 11A).

In the case of the example shown in FIG. 11B, since the rotational speed has become equal to or less than a predetermined value due to strong wind, the compressor is once stopped and restarted, and after a normal operation for a certain period, the rotational speed is predetermined again. Even when it is detected that the value is less than or equal to the value, since the number of restarts is added and counted, the number of restarts due to strong winds reaches a predetermined number, so that it is erroneously detected as a failure.
Furthermore, in the hot water supply apparatus, it is desired to prevent the same erroneous detection that occurs in other constituent devices and components other than the fan motor.

Moreover, although there exists another prior art regarding the hot water supply apparatus which uses an ejector cycle (for example, refer patent document 2), the proposal of this invention is not disclosed.
JP2002-213816 JP2004-324930

As described above, in the control device of the prior art, the abnormality is detected, temporarily stopped and then restarted, and when the number of restarts reaches a predetermined number, it is determined that there is a failure. There was a problem of false detection due to disturbance.
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a hot water supply apparatus that detects a fault location with higher accuracy and minimizes erroneous detection as much as possible.
Another object of the present invention is to provide a control device capable of avoiding unnecessary maintenance and performing highly reliable control by improving the accuracy of fault detection.

  According to a first aspect of the present invention, in order to achieve the above-described object, a control device for a device including at least one component device determines that the component device is faulty. And a predetermined number setting means. The determination means has a function of detecting an abnormality of the component device and temporarily stopping and restarting the component device in which the abnormality is detected, measuring the number of restarts, and setting the number of restarts to a predetermined number. When it reaches, it determines with the said component apparatus having failed. The predetermined number setting means resets the number of restarts to a predetermined number (for example, 0) once the component equipment once stopped is in a normal operating state.

  By configuring in this way, for example, in the control at the time of abnormality of components such as a fan motor of a hot water supply device, conventionally, there was a possibility that, for example, the influence of strong winds was measured and erroneously determined as abnormal. 1 is provided with a predetermined number setting means for resetting it to a predetermined number once it is normally operated (for example, clearing it to 0), so that it is determined by counting the number of restarts only when it really fails. Can be reliably determined. Accordingly, it is possible to prevent the user from performing unnecessary maintenance, and to further prevent the user from being unnecessarily concerned about the failure.

According to the second aspect of the present invention, in the form according to the first aspect, the determination that the component device is once operating normally is that the output value of the component device is the component device. Is carried out when it is in a predetermined normal value range in which it can be determined that is operating normally.
According to this embodiment, the normal operation state of the constituent devices is clarified.

According to a third aspect of the present invention, in the form according to the first aspect, the determination that the component device has once normally operated continues with a state in which the component device normally operates. It is performed when a predetermined time elapses.
According to the present embodiment, it is possible to more accurately determine whether the component device is abnormal or normal by setting the time during which the component device is continuously operated for a predetermined time as a normal determination reference (providing a normal determination time). Can do.

Moreover, in the form of Claim 4 of this invention, in the form of the said Claim 1, the determination that the said component apparatus is once operating normally is that the output value of the said component apparatus is predetermined. It is characterized in that the state in the normal range is performed when a predetermined time elapses continuously.
According to the present embodiment, the normality determination is more strictly defined as a condition in which the state in which the output value is in the predetermined normal range continuously elapses for a predetermined time. It is possible to determine whether it is normal with higher accuracy.

Moreover, in the form of Claim 5 of this invention, in the form of the said Claim 2, in determination of whether the said component apparatus is operating normally, the said output value when the frequency | count of restart is zero. The predetermined normal value range is set as the first normal value range, and the predetermined normal value range of the output value in the state where the number of retries is 1 or more, that is, already restarted once or more is the second normal value. As a range, the first normal value range is closer to the output value during normal operation than the second normal value range.
According to this embodiment, it is possible to surely confirm whether or not a failure has occurred by more strictly defining the normal value range when the number of restarts is one or more.

According to a sixth aspect of the present invention, the predetermined number of restarts is individually determined by the component device according to any one of the first to fifth aspects. In addition, the first predetermined number of components that can be easily removed is larger than the second predetermined number of components that are difficult to remove.
According to this embodiment, considering the characteristics of individual devices such as the maintainability of the devices, it is possible to safely perform failure diagnosis early by changing the predetermined number of restarts for each device. It is possible to accurately determine an abnormality according to the situation.

  A control device according to a seventh aspect of the present invention is a control device for a device including at least one component device. The control device detects an abnormality of the component device, temporarily restarts the component device and restarts it, measures the number of restarts, and if the number of restarts reaches a predetermined number, And a predetermined number setting means for returning the number of restarts of the component device to a predetermined number once the component device is in normal operation. One of the plurality of component devices is a first component device B, another one is a second component device C, and a predetermined number of restarts of the first component device B is a first predetermined number. When the number of times b is set and the predetermined number of restarts of the second component device C is the second predetermined number of times b, the first device B is more removed than the second component device C. In the case where it is easy, the first predetermined number of times b is larger than the second predetermined number of times c.

  By configuring in this way, in the control at the time of abnormality of almost all components included in the hot water supply device, for example, in order to prevent erroneous detection of failure due to strong wind or water foreign matter, 0 is cleared once it is normally operated. Since the zero clear means is provided, the device can be operated until it can be clearly determined that there is a failure, and the failure of the component device can be reliably determined. As a result, unnecessary operation interruption and unnecessary maintenance can be avoided, so that the reliability of the apparatus is improved. In addition, considering the characteristics of individual devices such as device maintainability, it is possible to safely perform failure diagnosis early by changing the predetermined number of restarts for each device. It becomes possible to judge abnormalities.

Moreover, in the form of Claim 8 described in this invention, in any one of the forms as described in any one of the said Claims 1-7, the hot water supply apparatus (100, 200) is for storing warm water. Hot water storage tank (5), compressor (1) that compresses and heats the refrigerant, water refrigerant heat exchanger (2) that heats the hot water with the refrigerant, and refrigerant that is heat-exchanged in the water refrigerant heat exchanger And an evaporator (4) for evaporating the refrigerant by exchanging heat with the outdoor air (41) driven by the fan motor (45), and heat exchange between the hot water storage tank and the water refrigerant And a water supply pump (6) for circulating hot water to and from the vessel. The control device is provided in the hot water supply device and controls at least one of the compressor, the fan motor, and the water supply pump.
According to this embodiment, the control target of the control device is clarified.

  In the above description of the present invention, symbols or numbers in parentheses () are attached to show correspondence with the embodiments described below.

  Hereinafter, a control device and a control method thereof according to an embodiment of the present invention will be described in detail with reference to the drawings. The control device is described for a hot water supply device. FIG. 1 is an explanatory diagram schematically showing a configuration of a hot water supply apparatus 100 including a control device according to an embodiment of the present invention. FIG. 3 is a flowchart of control at the time of abnormality in the control device according to the first embodiment of the present invention.

  A configuration of a hot water supply apparatus 100 according to an embodiment of the present invention will be described with reference to FIG. The hot water supply apparatus 100 includes a compressor (compressor) 1, a refrigerant flow path 21 of a water refrigerant heat exchanger 2, an expansion valve 3, an air heat exchanger (evaporator) 4 provided with an outdoor fan 41, and an accumulator (not shown). ) Are connected annularly by a refrigerant pipe 42, a hot water storage tank 5 for storing hot water for hot water supply, and a hot water flow path 22 of the water-refrigerant heat exchanger 2 are connected by a hot water pipe 51, and a circulation pump is provided in the middle 6 is provided with a hot water circuit W interposing 6 and a control device (not shown).

  The compressor 1 is driven by a built-in electric motor, and compresses and discharges the gas-phase refrigerant sucked from the accumulator to a critical pressure or higher. Note that the capacity (rotational speed) of the compressor 1 increases or decreases in accordance with the amount of power supplied to the electric motor.

  The water-refrigerant heat exchanger 2 has a refrigerant channel 21 through which refrigerant (carbon dioxide) discharged from the compressor 1 flows, and a hot water channel 22 through which hot water flows. The refrigerant (hot gas) compressed to high temperature and high pressure by the compressor 1 described above flows in the refrigerant flow path 21 of the water refrigerant heat exchanger 2, and thereby reversely flows in the hot water flow path 22 of the water refrigerant heat exchanger 2. The hot water flowing in is heated and the hot water temperature rises. In addition, a feed water temperature sensor 511 and a hot water supply temperature sensor 512 are disposed on the inlet and outlet sides of the hot water flow path 22, respectively, and a refrigerant temperature sensor 421 and a refrigerant discharge are respectively provided on the outlet side and the inlet side of the refrigerant flow path 21. A temperature sensor 422 is arranged.

  The expansion valve 3 has a valve body that is driven by an actuator, and can vary the valve opening according to the amount of current supplied to the actuator. When the refrigerant passes through the expansion valve 3, it expands to a low pressure.

  The air heat exchanger 4 evaporates the low-temperature refrigerant that has been decompressed through the expansion valve 3 by exchanging heat with the outside air blown by the outdoor fan 41 (atmospheric heat absorption). An accumulator is provided for gas-liquid separation of the refrigerant flowing out of the air heat exchanger 4, and the gas-phase refrigerant is sent to the compressor 1. In addition, the refrigerant | coolant input temperature sensor 411, the frost temperature sensor 412, and the external temperature sensor 413 are each arrange | positioned at the inlet of the air heat exchanger 4, the exit side, and fan vicinity.

  The hot water pipe 51 is a pipe that connects a hot water outlet 52 provided in the lower part of the hot water storage tank 5 and a hot water inlet 53 provided in the upper part. Hot water in the hot water storage tank 5 is discharged from the hot water outlet 52 by the circulation pump 6 and passes through the hot water pipe 51 through the hot water passage 22 of the water / refrigerant heat exchanger 2, and the heated hot water is supplied from the hot water inlet 53 to the hot water storage tank 5. Return inside.

  Based on the outputs of the water supply temperature sensor 511, the hot water supply temperature sensor 512, the refrigerant temperature sensor 421, the refrigerant discharge temperature sensor 422, the refrigerant input temperature sensor 411, the frost temperature sensor 412, and the outside air temperature sensor 413, the hot water storage tank The energization of the circulation pump 6, the expansion valve 3, the outdoor fan 41, and the electric motor of the compressor 1 is controlled within each safe control range so that the temperature of the hot water supplied to the hot water 5 becomes the target hot water temperature.

  Next, a method for controlling hot water supply apparatus 100 having the above-described configuration shown in FIG. 1 will be described with reference to the flowchart in the control apparatus according to the first embodiment of the present invention shown in FIG. In the present embodiment, in particular, since the invention is an invention of an abnormal time control method for the fan motor 45 that drives the indoor fan 41 of FIG. 1, the flowchart of FIG. 3 shows only the abnormal control procedure. The overall control of the hot water supply apparatus is not the subject of the present invention, and it is considered that the present invention can be understood without explaining it, so the description thereof is omitted (for the overall control of the hot water supply apparatus, for example, It may be the same as that disclosed in Reference 1.

  In the control flowchart of the first embodiment in FIG. 3, when the fan motor abnormality control in the fan motor control is started in step 100 (S100), the process proceeds to step 101 (S101). In S101, it is detected whether or not there is a possibility that an abnormality has occurred in the fan motor 45. In the present embodiment, if the number of rotations of the operating fan motor 45 does not exceed a predetermined value (No), it is determined that there is a possibility that an abnormality has occurred, and step 104 (S104) The process proceeds to a process for controlling the stop of the fan motor 45. If the fan motor rotational speed exceeds the predetermined value (Yes), it is determined that no abnormality has occurred in the fan motor 45 (normal), and the process proceeds to step 102 (S102). When the process proceeds to S102, the fan motor is recognized as normal. Next, the process proceeds to step 103 (S103), and the retry counter that measures the number of restarts is cleared to zero. In the present embodiment, when the count value of the retry counter finally exceeds a predetermined value, it is determined that there is an abnormality in the fan motor 45. Therefore, clearing the retry counter to zero has no sign of abnormality. The state, that is, the initial state of the abnormal control of the fan motor 45 is set. Further, the pre-failure flag is turned OFF.

  If NO is determined in S101, the process proceeds to S104, and stop control of the fan motor 45, which is the process of S104, is performed. Next, the process proceeds to step 105 (S105). Here, the pre-failure flag is turned on to indicate that the system is being restarted. Next, the process proceeds to step 106 (S106), and it is determined whether or not the fan motor 45 has failed. In the present embodiment, here, if the retry counter exceeds 3 as the threshold (Yes) (however, the threshold of the retry counter may be larger than 3 or 2), step 108 ( The process proceeds to S108) to notify the user that the fan motor 45 is out of order using the remote controller or the like. For example, a code such as “H15” is displayed at the clock display position of the remote controller. When a user sees such an abnormal code, the user generally contacts a service representative or manufacturer and requests repair.

  If the retry counter does not exceed 3 in S106 (No), the process proceeds to step 107 (S107), the boiling restart is performed and the retry counter is incremented by 1, and the restart is attempted. The destinations of transition from S103, S107, and S108 are all step 109 (S109). Returning to S109, the series of fan motor abnormality control flow in FIG. 3 is terminated, and the process returns to the main fan motor control.

  The effect of the present embodiment will be described with reference to FIG. In FIG. 10, a broken line shows the conventional abnormal control. In the case of the conventional example shown by the broken line, all the retry counters (upper display) were measured due to the strong wind, and the counter was added, so in FIG. 10 it was erroneously determined as abnormal in the third strong wind and the fan motor 45 was stopped. (Dashed line) and the entire system was also stopped. However, by performing the control at the time of abnormality as in the first embodiment of the present invention, the retry counter is cleared to 0 when it operates normally like the retry counter displayed below. Even if the rotation speed is decreased or stopped frequently as shown in FIG. 10, it is not determined that the fan motor 45 is abnormal. On the other hand, if the fan motor 45 really fails, the fan motor 45 is restarted, and if the fan motor speed does not exceed a predetermined value (100 rpm here), the retry counter is incremented by one. When the value exceeds a predetermined value (3 in the above embodiment), it can be clearly determined that there is a failure. Thus, no abnormality determination error occurs.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, in contrast to the first embodiment described above, the normality determination is not a case where no abnormality is detected, but is determined to be normal if the fan motor 45 operates for a predetermined time. In the control flowchart of FIG. 4, steps 200 (S200), 201 (S201), and 203 (S203) to 207 (S207) are the same control flow as in FIG. The difference of the present embodiment from the first embodiment is that the fan motor speed is changed to step 202 (S202) when the fan motor rotational speed exceeds a predetermined value (100 rpm) in step 201 (S201). It is a motor normal judgment.

  In FIG. 4, the process of S202 is a subroutine process, and step 210 (S210) to step 214 (S214) are the control. When the control proceeds to S202, the process proceeds from S202 to S210, and then proceeds to step 211 (S211). Here, the timer is started at the moment when a Yes signal is issued in S201, and the time during which the fan motor rotational speed exceeds a predetermined value (Yes) is measured by the timer. The timer determines whether this Yes state has passed a predetermined continuous time. This timer is cleared to 0 when it is No at S201, and is counted up when it is Yes at S201. In this embodiment, when 60 seconds have elapsed as the continuous predetermined time, the routine proceeds to step 212 (S212) (however, the continuous predetermined time may be longer or shorter than 60 seconds). In S212, the fan motor is identified as normal, and the process proceeds to step 213 (S213). In S213, the fan motor retry counter is cleared to 0, and the pre-failure flag, which is an identification of restart, is turned OFF. If No in S211, the process proceeds from S211 or from S213 to Step 214 (S214). In S214, a series of subroutine processing is completed, and the process returns to S202. Next, the process proceeds from S202 to S208. S208 and subsequent steps are the same as those in the first embodiment.

  Furthermore, a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the subroutine processing relating to the fan motor normal determination in S202 is a different method from the second embodiment. In determining whether the fan motor is normal, it is determined whether or not the rotational speed of the fan motor is equal to or greater than a predetermined value. In S202, the processing from Step 220 (S220) to Step 227 (S227) of the subroutine shown in FIG. 5 is performed. When the process proceeds from S202 to S220 and the control enters a subroutine, the process proceeds to step 221 (S221). In S221, it is detected that the fan motor rotational speed is equal to or higher than a predetermined rotational speed (threshold). In the present embodiment, for example, if it is 150 rpm or more (Yes), the process proceeds to step 223 (S223), otherwise (No), the process proceeds to step 222 (S222) (however, the fan motor rotation speed threshold is It may be higher or lower than 150 rpm). For example, when the fan motor rotation speed is 110 rpm (No in S221), the process proceeds to S222, and the timer for determining whether it is normal is cleared to zero. Thereafter, the process proceeds to step 227 (S227). Control is returned from S227 (ie, the process proceeds to S208 in FIG. 4 and the control is continued).

  If YES in S221, for example, 200 rpm, the process proceeds to S223, and the normality determination timer is counted up. Next, the process proceeds from S223 to step 224 (S224), and it is determined whether or not the normal determination timer has passed a predetermined period of time. If it exceeds a predetermined time, for example, 60 seconds, the process proceeds to step 225 (S225). If not, the process proceeds to step 227 (S227) (however, the continuous predetermined time of the timer may be longer or shorter than 60 seconds). good). If the process proceeds to S225, the fan motor is identified as normal, and the process proceeds to step 226 (S226). In S226, the fan motor retry counter is cleared to 0, and the pre-failure flag, which is the identification of restart, is turned OFF. In the case of No in S224, the process proceeds from S224 and from S226 to S227. The control after S227 has already been described above.

  Furthermore, a fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, fan motor abnormality control as shown in FIG. 6 is performed with respect to the first and second embodiments described above. In the fan motor abnormality control according to the present embodiment, once the pre-failure flag is determined to be before the failure, processing for changing the detection value of the abnormality determination is performed. FIG. 6 is a flowchart corresponding to FIG. 3 or FIG. In FIG. 6, when the abnormality control of the fan motor 45 is started in step 300 (S300), the process proceeds to step 301 (S301). If the pre-failure flag is ON in S301 (a state where there is a possibility of abnormality), the process proceeds to step 302 (S302); otherwise (a state where there is a possibility of normality), the process proceeds to step 303 (S303). In both S302 and S303, a determination value (A) for determining the normal state of the fan motor speed is set, but different determination values are set depending on the state of the pre-failure flag. In this embodiment, as an example, the determination value (A) of the fan motor rotation speed from normal (when normal) is A = 100 rpm, and A = 150 rpm before failure (however, the determination values are different values). May be).

  After performing the processing of S302 or S303, the control proceeds to step 304 (S304). If the fan rotation speed exceeds the determination value A in S304 (Yes), the process proceeds to step 305 (S305), otherwise (No) to S306, and the same as in the second embodiment. Perform the process. S302 may be set to be several times lower than the target value of 600 rpm and set to a more severe condition such as 500 rpm. Further, the determination of the abnormality in S304 may be determined based on the control range in which the abnormality detection does not exceed 150 to 700 rpm instead of the determination that the predetermined rotation speed is exceeded. Thus, failure determination can be controlled with higher accuracy.

  Further, a fifth embodiment of the present invention will be described with reference to FIGS. In the first to fourth embodiments described above, the control is limited to the abnormality control of the fan motor 45. However, in the present embodiment, not only the fan motor 45 but also the entire system diagnosis of the hot water supply device 100 is diagnosed. The configuration of the control at the time of abnormality (control processing) is disclosed. In the present embodiment, the flowcharts shown in FIGS. 7 to 9 are configured from the viewpoint of the abnormality process of each device with respect to the main process. The point is that the number of retries is changed for each device target. The reason for this is that failure diagnosis is performed early, such as by reducing the number of retries, for an object that may cause equipment damage (destruction) if the number of retries is large. This is because the degree of damage that the number of retries gives to the device differs depending on the device.

  FIG. 7 shows a flowchart of the abnormality control of the entire hot water supply system. When abnormality processing for all devices is started in step 400 (S400), the process proceeds to step 401 (S401). In S401, the compressor system abnormality retry count R1 is set. In this embodiment, as an example, R1 = 3. Compressor system abnormality is an example of an inverter (control device) that drives and controls the compressor 1 and, if there is too much output current that drives the compressor and motor, there is a risk of causing damage to the driving elements (IGBT, IPM, etc.) Therefore, detection is stopped as an abnormality. Thereafter, the process proceeds from step S401 to step 402 (S402). In S402, the number of abnormal retries of other devices is set as R2. In the present embodiment, as an example, R2 = 6. The other devices are devices such as the fan motor 45 and the water supply pump 6 that can be easily replaced even if they are broken in maintenance. In the present embodiment, although not shown in the figure, the number of abnormal retries is individually set for a cycle system such as a refrigerant cycle pressure abnormality and a defrosting solenoid valve (65 in FIG. 2).

  Thereafter, the process proceeds from S402 to step 403 (S403). S403 is a fan motor abnormality process, and is different from the above-described configuration of the abnormality control of the fan motor 45 of the first to fourth embodiments, and the retry counter determination in step 415 (S415) is performed in R2. It is to be. From S403, the routine proceeds to a subroutine of control at the time of fan motor abnormality from step 410 (S410) to step 418 (S418). At the same time, the process proceeds to step 404 (S404), and the process proceeds to the abnormality control of the water supply pump 6. In this embodiment, the subroutine of the fan motor abnormality control from step 410 (S410) to step 418 (S418) is the same as the fan motor abnormality control of the first embodiment shown in FIG. The difference is that the determination value of the retry counter in S415 is R2 as described above (S106 in the first embodiment in FIG. 3). The fan motor abnormality control subroutine from step 410 (S410) to step 418 (S418) may be replaced with any of the second to fourth embodiments. However, only the determination value of the retry counter needs to be R2. Except for the above differences, the embodiment is the same as the above-described embodiment, and thus the description thereof is omitted.

  Further, in the abnormality control of the water supply pump in S404 in FIG. 7, the control proceeds to step 420 shown in FIG. 8, and simultaneously shifts to the compressor motor system abnormality control in step 405 (S405). FIG. 8 shows a flowchart of the control when the water supply pump is abnormal (from step 420 (S420) to step 428 (S428)). As shown in FIG. 8, the flow (subroutine) of the feed water pump abnormality control according to the present embodiment is the same as the flow of the fan motor abnormality control subroutine shown in FIG. This is the same as the flow of the fan motor abnormality control of the first embodiment shown in FIG. For the water supply pump abnormality, the same control as the fan motor abnormality can be applied. As shown in step 425 (S425) of FIG. 8, the retry counter is determined at R2 to determine the failure of the water supply pump 6. In the case of a pump, for example, assuming that foreign matter is mixed in water and the pump is temporarily locked, there is a possibility of erroneous detection in the same manner as in the fan motor. Therefore, similar to the first to fourth embodiments. Apply failure determination. The control flow shown in FIG. 8 is basically the same as the control flow shown in FIG. 7 or FIG.

  From S405, the process proceeds to the compressor motor system abnormality control from step 430 (S430) to step 438 (S438). First, the process proceeds from S405 to S430. FIG. 9 shows a flowchart of the control when the compressor motor system is abnormal. As shown in FIG. 9, the flow (subroutine) of compressor motor system abnormality control according to the present embodiment is the same flow as the fan motor abnormality control subroutine shown in FIG. This is the same as the flow of control when the fan motor is abnormal in the first embodiment shown in FIG. 9 is different from the control processing of the abnormal control of the fan motor 45 or the feed water pump 6 shown in FIG. 7 or 8 in the control of the compressor system in S405 shown in FIG. 9, the determination of the retry counter in step 435 (S435) is R1. It is a point that is implemented in. In the present embodiment, the basic control flow of the control when the feed water pump is abnormal and / or the control when the compressor motor system is abnormal is similar to the control flow of the first embodiment. It may be replaced by any of the control flows of the embodiment.

  In case of compressor system abnormality, if the output current that drives the motor mentioned in the previous example is too much, if the motor is stopped and restarted many times, the motor coil built in the compressor has a large output current. There is a danger that the coil itself generates heat and overheats and the coil itself is disconnected. If a failure occurs, the compressor and the refrigeration cycle system have very poor maintainability, and in many cases, the heat pump unit is replaced. Therefore, it is preferable to stop before entering such a failure mode and inform the user so that maintenance can be performed early. In the meantime, the compressor is controlled to reduce the rotation speed of the compressor or set the boiling temperature lower, so that it will not cause fatal equipment damage even if it fails in terms of safety.

FIG. 2 is an explanatory diagram schematically showing the configuration of another hot water supply apparatus 200 according to the embodiment of the present invention. Referring to FIG. 2, the element parts of FIG. 2 that are the same as or similar to the element parts of the hot water supply device 100 disclosed in FIG. 1 are designated by the same reference numerals.
A hot water supply apparatus 200 shown in FIG. 2 is one in which an ejector cycle using an ejector is applied to the heat pump cycle H of the hot water supply apparatus 100 according to the first embodiment of the present invention. In the heat pump cycle H shown in FIG. 1, an ejector 70 is disposed between the water-refrigerant heat exchanger 2 and the air heat exchanger 4. Therefore, in description of this hot water supply apparatus 200, the structure different from the hot water supply apparatus 100 shown in FIG. 1 is mainly demonstrated, and description about the overlapping structure is abbreviate | omitted.

  The ejector 70 expands the refrigerant under reduced pressure and sucks the gas-phase refrigerant evaporated in the evaporator (air heat exchanger) 4 and converts the expansion energy into pressure energy to increase the suction pressure of the compressor 1. . As shown in FIG. 2, the ejector 70 evaporates in the evaporator 4 by converting the pressure energy of the flowing high-pressure refrigerant into velocity energy to decompress and expand the refrigerant, and the high-speed refrigerant flow ejected from the nozzle 71. The mixing unit 72 that mixes the refrigerant flow ejected from the nozzle 71 while sucking the vapor phase refrigerant that has been sucked in, and the velocity energy is converted into pressure energy while mixing the refrigerant ejected from the nozzle 71 and the refrigerant sucked from the evaporator 4. It comprises a diffuser 73 or the like that converts and raises the pressure of the refrigerant.

The gas-liquid separator 50 not shown in FIG. 1 is shown in FIG. 2, and the refrigerant that flows out of the ejector 40 flows in, and the refrigerant that has flowed in is separated into a gas-phase refrigerant and a liquid-phase refrigerant. The gas-phase refrigerant outlet of the gas-liquid separator 50 is connected to the suction side of the compressor 1, and the liquid-phase refrigerant outlet is connected to the inlet side of the evaporator (air heat exchanger) 4 side. Connected.
The bypass circuit 64 is a refrigerant passage that distributes the refrigerant discharged from the compressor 1 to the evaporator 4 and the gas-liquid separator 50 by bypassing the water refrigerant heat exchanger 2 and the ejector 70. The flow rate of refrigerant flowing in is controlled by an electromagnetic valve 65 whose opening / closing operation is controlled by a control device (not shown). In this embodiment, it is assumed that the hot water circuit W shown in FIG. 1 is provided, and therefore the hot water circuit W is omitted in FIG. 2 and is not shown.

The hot water supply apparatus 200 is also provided with an evaporator (air heat exchanger) 4, an outdoor fan 41 is attached to the evaporator 4, and the outdoor fan 41 is driven by a fan motor 45. Therefore, the control when the fan motor 45 is abnormal is necessary, and the hot water supply apparatus 200 performs the same control as the control when the fan motor is abnormal shown in FIG. Since this abnormal control is exactly the same as that described in the first embodiment, description thereof is omitted. That is, in the present embodiment, only the configuration of the hot water supply apparatus 200 is different from the hot water supply apparatus 100 of the first embodiment, and the control at the time of abnormality is the same.
Any one of the abnormality control of the fan motor according to the second to fourth embodiments may be applied to the apparatus configuration using the ejector cycle of the hot water supply apparatus 200. Moreover, the control at the time of abnormality of the whole hot water supply apparatus of 5th Embodiment may be applied to the apparatus structure using the ejector cycle of this hot water supply apparatus 200. FIG.

Next, effects and operations of the above embodiment will be described.
The following effects can be expected by the fan motor abnormality control in the control device of the first embodiment of the present invention.
-In the case of abnormal control of a fan motor, conventionally, for example, a retry counter was measured due to a strong wind and erroneously determined to be abnormal. However, by controlling as in the present invention, that is, when it operates normally, the retry counter is cleared to zero. By doing so, the retry counter is incremented by +1 if the fan motor rotation speed does not exceed a predetermined value only in the case of a real failure, so that it can be correctly determined that the fan motor is clearly broken.
・ Do not allow users to perform unnecessary maintenance, and do not give them more uneasiness that they may have broken down.

The following effects can be expected by the fan motor abnormality control in the control device of the second embodiment of the present invention.
-With this configuration, it is possible to determine whether it is abnormal or normal with higher accuracy by providing a normal determination time (setting the continuous operation time of the fan motor as a reference for normal determination).

The following effects can be expected by the fan motor abnormality control in the control device of the third embodiment of the present invention.
With this configuration, by providing a determination hysteresis between normal determination and abnormal determination, it is possible to determine whether it is abnormal or normal with higher accuracy than in the second embodiment.

The following effects can be expected by the fan motor abnormality control in the control device of the fourth embodiment of the present invention.
-Strict detection of the return judgment from before the failure makes it possible to confirm whether it is a failure or not.

The following effects can be expected by the abnormal control in the control device of the fifth embodiment of the present invention.
-Almost all of the equipment and devices included in the hot water supply device can determine whether or not there is a failure with higher accuracy.
For example, in order to prevent erroneous detection of failure due to strong wind or water foreign matter, once the device is determined to be normal as in the present invention, the determination value for determining the failure is changed as in the retry counter (counter is cleared to 0) In this way, the device can be operated until it is clearly determined that there is a failure.
-As a result, unnecessary operation interruptions and unnecessary maintenance can be avoided, so that the operating efficiency of the device is improved and the reliability is also improved.
・ In addition, considering the characteristics of individual devices such as device maintainability, the number of restarts (retry) can be changed for each device, so that failure diagnosis can be performed safely and early. Accurate abnormality determination is possible.

In the embodiment described above or shown in the accompanying drawings, the control device of the present invention is described for a heat pump type hot water supply device. However, the present invention is not limited to this, and various devices and systems are used. Or you may apply to an installation.
The clearing of 0 in the above description is not limited to returning to 0, but may be an operation of returning to a predetermined number of times (for example, 1).

  The above-described embodiment is an example of the present invention, and the present invention is not limited by the embodiment, but is defined only by matters described in the claims, and other embodiments than the above are also possible. It can be implemented.

FIG. 1 is an explanatory diagram schematically showing a configuration of a hot water supply apparatus including a control device according to an embodiment of the present invention. FIG. 2 is an explanatory diagram schematically illustrating the configuration of another hot water supply apparatus including the control device according to the embodiment of the present invention. FIG. 3 is a flowchart of control in the control apparatus according to the first embodiment of the present invention, and shows a flow of control when the fan motor is abnormal. FIG. 4 is a flowchart of control in the control device according to the second embodiment of the present invention, and shows a flow of control when the fan motor is abnormal. FIG. 5 is a flowchart of control in the control device according to the third embodiment of the present invention, and shows a flow of control when the fan motor is abnormal. FIG. 6 is a flowchart of control in the control apparatus according to the fourth embodiment of the present invention, and shows a flow of control when the fan motor is abnormal. FIG. 7 is a flowchart of control in the control device according to the fifth embodiment of the present invention, and shows a flow of abnormality processing of the entire hot water supply device and a flow of control when the fan motor is abnormal. FIG. 8 is a flowchart of control when the feed water pump is abnormal in the control device of the fifth embodiment. FIG. 9 is a flowchart of compressor motor system abnormality control in the control apparatus of the fifth embodiment. FIG. 10 is an explanatory diagram of the effect of fan motor abnormality control in the control device according to the first embodiment of the present invention. FIG. 11 is an explanatory diagram of the problem of abnormal control in the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Water refrigerant heat exchanger 3 Expansion valve 4 Air heat exchanger (evaporator)
DESCRIPTION OF SYMBOLS 5 Hot water storage tank 6 Circulation pump 21 Refrigerant flow path 22 Hot water flow path 41 Outdoor fan 42 Refrigerant piping 45 Fan motor 100 Hot-water supply apparatus H Heat pump cycle W Hot water circuit

Claims (8)

In a control device for a device comprising at least one component device,
Detecting an abnormality of the component device, having a function of temporarily stopping and restarting the component device in which the abnormality is detected, measuring the number of restarts, and when the number of restarts reaches a predetermined number, A determination unit that determines that the component device is faulty, and a predetermined number setting unit that returns the number of restarts to a predetermined number once the component device that has been once stopped is in a state of normal operation.
A control device comprising:   The determination that the component device is once operating normally is performed when the output value of the component device is within a predetermined normal value range in which it can be determined that the component device is operating normally. The control device according to claim 1, wherein   The control device according to claim 1, wherein the determination that the component device is once normally operating is performed when a predetermined time elapses continuously in a state where the component device normally operates. .   The determination that the component device is normally operating once is performed when a state in which the output value of the component device is in a predetermined normal range continuously elapses for a predetermined time. Item 2. The control device according to Item 1. In determining whether the component device is operating normally, the predetermined normal value range of the output value when the number of restarts is 0 is set as a first normal value range, and the number of retries is 1 or more, that is, already 1 When the predetermined normal value range of the output value in the state of being restarted more than once is a second normal value range,
The control device according to claim 2, wherein the first normal value range is closer to an output value during normal operation than the second normal value range.   The predetermined number of restarts is individually determined by the component device, and the first predetermined number of component devices that are easy to remove is greater than the second predetermined number of component devices that are difficult to remove. It is set as a value, The control apparatus as described in any one of Claim 1 to 5 characterized by the above-mentioned. In a control device for a device comprising at least one component device, the control device comprises:
A restart means for detecting an abnormality of the component device and temporarily stopping and restarting the component device;
When the number of restarts is measured, and the number of restarts reaches a predetermined number, the determination unit determines that the component device is out of order, and further, once the component device is in normal operation, the component device. A predetermined number setting means for returning the number of restarts to a predetermined number;
It has
One of the plurality of component devices is a first component device B, another one is a second component device C, and a predetermined number of restarts of the first component device B is a first predetermined number. When the number of times b is set, and the predetermined number of restarts of the second component device C is the second predetermined number of times b,
When the first device B is easier to remove than the second component device C, the first predetermined number of times b is larger than the second predetermined number of times c. Control device. The control device according to any one of claims 1 to 7,
A hot water storage tank (5) for storing hot water, a compressor (1) for compressing and heating a refrigerant, a water refrigerant heat exchanger (2) for heating hot water with the refrigerant, and the water refrigerant heat exchanger An evaporator (4) for evaporating the refrigerant by exchanging heat between the refrigerant having undergone heat exchange and the outdoor air (41) driven by a fan motor (45), and the hot water storage tank And a water supply pump (6) for circulating hot water between the water refrigerant heat exchanger and at least one of the compressor, the fan motor, and the water supply pump of the hot water supply device (100, 200). Control device characterized by controlling one.

Images