JP2018132134A - Device and method for detecting abnormality of power transmission belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for detecting abnormality of a power transmission belt, allowing for further exact determination of the presence or absence of an abnormality related to the power transmission belt.SOLUTION: A generator 30 automatically stops power generation when the actual number of revolutions of a rotor 32 for generating power by being rotated is reduced, and reaches the prescribed number of revolutions of the rotor or lower. An abnormality detection device 100 of a power transmission belt comprises a control device 70 for setting a target engine speed TER of a gas engine 10, and an engine speed detection sensor 12a for detecting the actual engine speed AER of the gas engine 10. When the generator 30 is automatically stopped, the control device 70 detects the actual engine speed AER of the gas engine 10 by using the engine speed detection sensor 12a, calculates a difference ΔR between the set target engine speed TER of the gas engine 10 and the detected actual engine speed AER of the gas engine 10, and when the calculated difference ΔR is a prescribed threshold RT or lower, determines that an abnormality related to the power transmission belt 34 occurs.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an abnormality detection device and an abnormality detection method for a power transmission belt that transmits the rotational driving force of an engine to a generator. In particular, the present invention relates to an abnormality detection device and an abnormality detection method for a power transmission belt that transmits the rotational driving force of an engine included in a self-supporting engine-driven air conditioner to a generator included in the apparatus.

  For example, a self-supporting engine-driven air conditioner as shown in Patent Document 1 below is known. This self-contained engine-driven air conditioner includes an air-conditioning unit that air-conditions by the rotational driving force of the engine and a generator that generates electric power by the rotational driving force of the engine. The electric power generated by the generator is supplied to the components (electrically driven parts) of the air conditioning unit that is driven by the electric power. For this reason, the self-supporting engine-driven air conditioner can perform air-conditioning operation independently without being supplied with power from an external power source such as a commercial power source. Therefore, the air-conditioning operation can be continued not only in the normal time when power can be supplied from the external power source but also in the non-normal time (for example, during a power failure) where the power cannot be supplied from the external power source. it can.

  Generally, a self-supporting engine-driven air conditioner includes a control device (microcomputer). The control device is one of the electric drive components. Connected to the control device are a temperature sensor that measures the room temperature, an engine speed sensor that detects the actual engine speed, a pressure sensor that detects the discharge pressure of the air-conditioning refrigerant from the compressor, and the like. A control apparatus acquires various data from these sensors, and controls an engine, a compressor, a generator, etc. based on the acquired data.

  The rotational driving force of the engine is transmitted to the rotor of the generator via the power transmission belt. Therefore, when an abnormality occurs in the power transmission belt (for example, when the power transmission belt is loosened), the rotational driving force of the engine is not normally transmitted to the rotor. That is, the number of rotations of the rotor is reduced as compared with the normal operation. In addition, the engine speed may temporarily decrease due to the influence of strong winds, misfire (ignition plug spark failure), and the like. In this case, the rotational speed of the rotor is temporarily reduced as compared with the normal operation.

JP 2004-301343 A

(Problems to be solved by the invention)
Here, when the rotation speed of the rotor is equal to or lower than a predetermined rotation speed, the generator may be configured to automatically stop power generation. In this case, the control device can detect that the generator has automatically stopped. However, the conventional control device cannot analyze the cause of the generator stopping power generation, and always determines that an abnormality relating to the power transmission belt has occurred. That is, actually, even when the generator is stopped due to a temporary decrease in the actual engine speed due to the influence of strong wind, misfire, etc., the control device relates to the power transmission belt. It was erroneously determined that an abnormality occurred. In this case, power generation by the generator remains stopped until a manual operation for restarting power generation is performed by the user. While the power generation by the generator is stopped, the electric drive component is driven by the electric power supplied from the commercial power source.

  It is an object of the present invention to provide a power transmission belt abnormality detection device and abnormality detection method that can more accurately determine the presence or absence of abnormality relating to a power transmission belt.

(Means for solving the problem)
A feature of the present invention resides in a generator (30) that automatically stops power generation when the actual rotational speed of the rotor (32) that rotates to generate electric power decreases and falls below a predetermined rotor rotational speed. A power transmission belt abnormality detection device (100) for detecting an abnormality related to the power transmission belt (34) for transmitting the rotational driving force of the engine (10), wherein the target rotation speed (TER) of the engine is set. A device (70) and an engine speed detection device (12a) for detecting an actual engine speed (AER) of the engine, and the control device rotates the engine speed when the generator is automatically stopped. The actual rotational speed of the engine is detected using a number detection device, and a difference (ΔR) between the set target rotational speed of the engine and the detected actual rotational speed of the engine is calculated, and the calculated difference is predetermined. Threshold (RT) when less, determines that an abnormality relating to the power transmission belt has occurred, in that the abnormality detecting device for a power transmission belt (1).

  If an abnormality (for example, looseness) occurs in the power transmission belt, even if the actual engine speed is equal to the target engine speed, the generator rotor's actual engine speed decreases and the generator automatically generates power. To stop. On the other hand, even if the power transmission belt is normal, if the actual rotational speed of the engine temporarily decreases due to strong wind, misfire, etc., the actual rotational speed of the generator rotor will decrease and the generator will automatically generate power. Stop. The control device determines whether an abnormality has occurred in the power transmission belt based on the difference between the target engine speed and the actual engine speed. That is, if the difference between the target engine speed and the actual engine speed is greater than the predetermined threshold value, it is determined that the power transmission belt is normal. On the other hand, when the generator is automatically stopped, if the difference between the target engine speed and the actual engine speed is equal to or smaller than a predetermined threshold value, it is determined that “an abnormality has occurred in the power transmission belt”. Therefore, according to the present invention, when the generator stops power generation, the presence or absence of abnormality relating to the power transmission belt is always compared with the conventional device that determines that "an abnormality relating to the power transmission belt has occurred" Accurate judgment can be made.

  In addition, a simple control device similar to the conventional one can be used. That is, a sensor for directly detecting the state of the power transmission belt, a sensor for detecting the actual rotational speed of the generator, and an input terminal for inputting information supplied from these sensors are provided. There is no need to use a high-performance microcomputer capable of processing.

  Another feature of the present invention is that the control device is a power transmission belt abnormality detection device that causes the generator to resume power generation when the calculated difference is greater than the predetermined threshold.

  According to this, power generation is automatically resumed. That is, manual operation for restarting power generation is not necessary.

  Another feature of the present invention is that the power transmission belt is abnormal when the calculated difference is greater than the predetermined threshold and the generator has stopped generating power for a predetermined time (T). This is to provide a power transmission belt abnormality detection device including a notification device (50) for notifying that the occurrence of the power failure occurs.

  When the actual rotation speed of the engine temporarily decreases and the generator stops generating power, if the power transmission belt is also abnormal, the engine rotation Since the driving force is not normally transmitted to the generator, power generation is not actually resumed. In addition, it takes a certain amount of time (for example, about 10 seconds) until the actual rotational speed returns to the target rotational speed after the actual rotational speed of the engine temporarily decreases due to strong wind, misfire, or the like. Therefore, even if the power transmission belt is actually normal, it takes a certain amount of time from when a signal for restarting power generation by the generator is supplied to the generator until when power generation is actually restarted. Therefore, when the state where the power generation by the generator is stopped is continued for a predetermined time, it is configured to notify that an abnormality has occurred in the power transmission belt. According to this, the presence or absence of abnormality regarding the power transmission belt can be reported more accurately than the conventional device.

It is a block diagram which shows the structure of the self-supporting engine drive type air conditioner which concerns on this embodiment. It is a flowchart which shows the abnormality determination process of a power transmission belt. It is a time chart which shows the operation | movement sequence which restarts electric power generation. It is a time chart which shows the operation | movement sequence which alert | reports that abnormality has generate | occur | produced in the power transmission belt.

  Hereinafter, a self-contained engine-driven air conditioner 1 to which a power transmission belt abnormality detection device 100 according to an embodiment of the present invention is applied will be described. As shown in FIG. 1, the self-supporting engine-driven air conditioner 1 includes a gas engine 10, an air conditioning unit 20, a generator 30, a battery 40, an indoor unit remote controller 50, a starter motor 60, and a control device 70.

  The gas engine 10 is driven by the supply of gas fuel from the gas pipe 11. The opening degree of the valve 111 that adjusts the amount of gas fuel supplied to the gas engine 10 is controlled by the control device 70 described later, and the rotational speed of the gas engine 10 is controlled. The gas engine 10 includes an output shaft 12, and the rotational driving force of the gas engine 10 is extracted from the output shaft 12 to the outside. The gas engine 10 is configured to be started by a starter motor 60. The gas engine 10 is provided with an engine speed sensor 12a for detecting the actual speed AER.

  The air conditioning unit 20 includes a compressor 21, a refrigerant pipe 22, an indoor heat exchanger 23, an outdoor heat exchanger 24, an expansion valve 25, a four-way switching valve 26, and an accumulator 27. The indoor heat exchanger 23, the outdoor heat exchanger 24, the expansion valve 25, and the four-way switching valve 26 are interposed in the refrigerant pipe 22. A refrigerant flows through the refrigerant pipe 22.

  The compressor 21 has an input shaft 211 connected to the output shaft 12 of the gas engine 10 so that power can be transmitted, and is driven by the rotational driving force of the gas engine 10. The compressor 21 has a suction port 21a and a discharge port 21b. When the compressor 21 is driven, the low-pressure gas refrigerant in the refrigerant pipe 22 is sucked from the suction port 21a, the sucked low-pressure gas refrigerant is compressed inside, and the compressed high-pressure gas refrigerant is discharged to the refrigerant pipe 22 from the discharge port 21b. To do.

  Each of the indoor heat exchanger 23 and the outdoor heat exchanger 24 introduces the refrigerant in the refrigerant pipe 22 and exchanges heat between the introduced refrigerant and ambient air. An expansion valve 25 is interposed in the middle of the refrigerant pipe 22 that connects the indoor heat exchanger 23 and the outdoor heat exchanger 24. The expansion valve 25 expands the refrigerant in the refrigerant pipe 22.

  Two independent passages are formed inside the four-way switching valve 26. The four-way switching valve 26 is configured to be able to selectively switch between a heating connection state and a cooling connection state. When the four-way switching valve 26 is in the heating connection state, the discharge port 21b of the compressor 21 and the indoor heat exchanger 23 are communicated with each other through one passage formed in the four-way switching valve 26, and the suction port 21a of the compressor 21 and the outdoor The heat exchanger 24 communicates with the other passage formed in the four-way switching valve 26. On the other hand, when the four-way switching valve 26 is in the cooling connection state, the discharge port 21b of the compressor 21 and the outdoor heat exchanger 24 are communicated with each other through one passage formed in the four-way switching valve 26, and the suction port 21a of the compressor 21 is connected. And the indoor heat exchanger 23 are communicated with each other through the other passage formed in the four-way switching valve 26. During the heating operation, the four-way switching valve 26 is in a heating connection state, and during the cooling operation, the four-way switching valve 26 is in a cooling connection state.

  The heating operation and cooling operation of the air conditioning unit 20 will be briefly described. First, the heating operation will be described. When the compressor 21 is driven by the gas engine 10, the low pressure gas refrigerant is sucked into the compressor 21 from the suction port 21a and the sucked low pressure gas refrigerant is compressed. The compressed high-pressure gas refrigerant is discharged from the discharge port 21b. The high-pressure gas refrigerant discharged from the discharge port 21 b is introduced into the indoor heat exchanger 23 via the four-way switching valve 26. The high-pressure gas refrigerant introduced into the indoor heat exchanger 23 discharges heat to the indoor air and condenses while circulating in the indoor heat exchanger 23. At this time, the indoor air is warmed by the heat discharged from the high-pressure gas refrigerant, and the room is heated.

  The refrigerant condensed by discharging heat to the indoor air is partially liquefied and discharged from the indoor heat exchanger 23. Then, after the pressure is reduced by expansion by the expansion valve 25, it is introduced into the outdoor heat exchanger 24. The refrigerant introduced into the outdoor heat exchanger 24 takes away the heat of the outside air while flowing through the outdoor heat exchanger 24 and partially evaporates.

  The refrigerant that has partially evaporated due to the heat of the outside air is discharged from the outdoor heat exchanger 24 and supplied to the accumulator 27 via the four-way switching valve 26. In the accumulator 27, the refrigerant is separated into a liquid refrigerant and a low-pressure gas refrigerant. Then, only the low-pressure gas refrigerant returns to the compressor 21 from the suction port 21 a of the compressor 21.

  Next, the cooling operation will be described. When the compressor 21 is driven by the gas engine 10, the high-pressure gas refrigerant is discharged from the discharge port 21 b of the compressor 21. The high-pressure gas refrigerant discharged from the discharge port 21 b is introduced into the outdoor heat exchanger 24 via the four-way switching valve 26. The high-pressure gas refrigerant introduced into the outdoor heat exchanger 24 discharges heat to the outside air and condenses while circulating in the outdoor heat exchanger 24.

  A part of the refrigerant condensed by exhausting heat to the outside air is liquefied and discharged from the outdoor heat exchanger 24. Then, the pressure is reduced by expansion by the expansion valve 25 and then introduced into the indoor heat exchanger 23. While the refrigerant introduced into the indoor heat exchanger 23 flows through the indoor heat exchanger 23, it takes away the heat of the indoor air and partially evaporates. At this time, the refrigerant removes heat from the room air, thereby cooling the room air and cooling the room.

  The refrigerant that has partially evaporated the heat of the indoor air is discharged from the indoor heat exchanger 23 and supplied to the accumulator 27 via the four-way switching valve 26. Then, only the low-pressure gas refrigerant returns to the compressor 21 from the suction port 21 a of the compressor 21.

  As described above, the air conditioning unit 20 performs air conditioning by the driving force of the gas engine 10 during heating and during cooling.

  The air conditioning unit 20 includes various components other than the above-described components, for example, an indoor heat exchanger fan 231 and an outdoor heat exchanger fan 241. The indoor heat exchanger fan 231 and the outdoor heat exchanger fan 241 are driven by receiving power. The four-way switching valve 26 is also switched by receiving power. Furthermore, the opening degree of the expansion valve 25 is also adjusted by receiving power supply. In the following description, a component that is a component of the air conditioning unit 20 and that is driven by receiving power supply is referred to as an electric drive component.

  The generator 30 includes a stator 31, a rotor 32, an electromagnetic clutch 33, and a power transmission belt 34. The stator 31 (or the rotor 32) generates a magnetic field. The rotor 32 (or the stator 31) has a coil. When the rotor 32 rotates with respect to the stator 31, a current flows through the coil. One clutch plate 33 a of the electromagnetic clutch 33 is connected to the rotor 32, and the other clutch plate 33 b is connected to the output shaft 12 of the gas engine 10 via the power transmission belt 34. The rotational driving force of the gas engine 10 is transmitted to the rotor 32 via the power transmission belt 34, and the rotor 32 rotates with respect to the stator 31. Thereby, electric power is generated. The electric power generated in this way is supplied to the electric drive component, the battery 40 and the control device 70 described above. The battery 40 stores the electric power generated by the generator 30. The battery 40 is electrically connected to the starter motor 60 and the control device 70, and is configured to supply power to them.

  Further, when the actual rotational speed of the rotor 32 decreases and becomes less than or equal to the predetermined rotor rotational speed, the generator 30 automatically generates power by disconnecting the clutch plate 33a and the clutch plate 33b of the electromagnetic clutch 33. To stop. At that time, the generator 30 supplies the control device 70 with a stop signal STP indicating that power generation has been automatically stopped. When the reset signal RES is supplied from the control device 70, the generator 30 connects the clutch plate 33a and the clutch plate 33b of the electromagnetic clutch 33. When the rotational speed of the rotor 32 increases and becomes greater than the predetermined rotor rotational speed (for example, 1000 rpm (during 500 W power generation)), the generator 30 controls a restart signal RST indicating that power generation has been restarted. Supply to device 70. The predetermined rotor rotational speed may be stored in advance in the generator 30 or may be set by the control device 70.

  As shown in FIG. 1, the indoor unit remote controller 50 is electrically connected to a commercial power source (external power source) C, and operates when electric power is supplied from the commercial power source C. The indoor unit remote controller 50 is configured to be able to set an operation start / stop instruction of the self-supporting engine-driven air conditioner 1, an air conditioning condition (for example, a target room temperature), and the like. The indoor unit remote controller 50 includes, for example, a push button type start switch. The indoor unit remote controller 50 also includes a temperature sensor that detects the room temperature. The indoor unit remote controller 50 is configured to be able to communicate with the control device 70 so that the set condition can be received by the control device 70. The indoor unit remote controller 50 has a function of notifying the abnormality using an image, sound, etc. when an abnormality occurs in the power transmission belt 34. That is, the indoor unit remote controller 50 corresponds to the notification device of the present invention.

  As described above, the starter motor 60 is electrically connected to the battery 40 and is also electrically connected to the commercial power source C. Accordingly, the starter motor 60 is driven by being supplied with power from the commercial power source C or the battery 40 to start the gas engine 10. When electric power can be supplied from both the commercial power source C and the battery 40, the starter motor 60 is supplied with electric power from the commercial power source C and is driven.

  The control device 70 is a microcomputer including an arithmetic device 71, a storage device 72, a timer 73, and the like. The control device 70 is electrically connected to the generator 30, the battery 40, and the commercial power source C. The control device 70 is based on conditions (for example, target room temperature) set by the indoor unit remote controller 50 and information from various sensors provided in the self-supporting engine-driven air conditioner 1. The apparatus 1 is controlled. For example, the control device 70 sets the rotation speed of the gas engine 10 (the opening degree of the valve 111) based on the difference between the target room temperature and the actually measured room temperature.

  The control device 70 operates by being supplied with electric power from the generator 30 during operation of the self-supporting engine-driven air conditioner 1. When the operation of the self-supporting engine-driven air conditioner 1 is stopped (when the gas engine 10 is stopped), the power supply from the commercial power source C is activated when the commercial power source C can supply power. When the supply is impossible, power is supplied from the battery 40 to operate.

  The power transmission belt abnormality detection device 100 includes a control device 70, an engine speed sensor 12a, and an indoor unit remote controller 50.

  Next, the startup procedure of the self-supporting engine-driven air conditioner 1 will be described. When the user presses the start switch of the indoor unit remote controller 50, a start signal is transmitted from the indoor unit remote controller 50 to the control device 70. Then, the control device 70 activated by receiving power supply from the commercial power source C outputs a drive signal to the starter motor 60. When the starter motor 60 receives a drive signal, power is supplied from the commercial power source C to the starter motor 60. The starter motor 60 is driven by being supplied with electric power from the commercial power source C. The gas engine 10 is started by driving the starter motor 60. Once the gas engine 10 is started, the driving is continued by supplying gas fuel thereafter, so that it is not necessary to drive the starter motor 60. Therefore, the power supply from the commercial power source C to the starter motor 60 is stopped.

  When the gas engine 10 is started, the compressor 21 connected to the gas engine 10 so as to be able to transmit power is driven. When the compressor 21 is driven, the refrigerant flows through the refrigerant pipe 22 and the air conditioning operation is started. The control device 70 sets the target rotational speed TER of the gas engine 10 according to the target room temperature and the actually measured room temperature. When the gas engine 10 is started, the generator 30 connected to the gas engine 10 so as to be able to transmit power is also driven to generate power. The electric power generated by the generator 30 is stored in the battery 40 and supplied to each electric drive component. Further, the power supply source to the control device 70 is switched from the commercial power source C to the generator 30. By supplying power from the generator 30 to each electric drive component and the control device 70, the air-conditioning operation of the self-supporting engine-driven air conditioner 1 is continued. That is, during normal operation, power is supplied from the commercial power source C only for starting the gas engine 10, and the generator 30 supplies power necessary for operation of the self-supporting engine-driven air conditioner 1 after starting. In addition, since power can be supplied from the commercial power source C at normal times, the control device 70 and each electric drive component from the commercial power source C can be used even when the gas engine 10 is started and the generator 30 generates power. You may supply electric power.

  When the power generation of the generator 30 is automatically stopped when the self-supporting engine-driven air conditioner 1 is in the air conditioning operation, the stop signal STP is supplied to the control device 70. Then, the arithmetic unit 71 executes a power transmission belt abnormality determination process shown in FIG. In step S10, the arithmetic device 71 starts a power transmission belt abnormality determination process. Next, the arithmetic unit 71 causes the timer 73 to start a time measuring operation in step S11. That is, the measurement of the time Δt that has elapsed since the generator 30 stopped is started (see FIGS. 3 and 4). Next, the arithmetic unit 71 determines whether or not the power transmission belt 34 is normal. Specifically, the arithmetic unit 71 detects the actual rotational speed AER of the gas engine 10 using the engine rotational speed sensor 12a, and calculates the difference ΔR between the target rotational speed TER and the actual rotational speed AER of the gas engine 10. Calculate. When the difference ΔR is larger than the predetermined threshold RT, the arithmetic device 71 determines that “the power transmission belt is normal”. That is, the generator 30 is automatically stopped because the actual rotational speed AER of the gas engine 10 has temporarily decreased due to strong wind, misfire, etc., and it is determined that no abnormality has occurred in the power transmission belt 34. On the other hand, when the difference ΔR is equal to or smaller than the predetermined threshold RT, the arithmetic device 71 determines that “an abnormality has occurred in the power transmission belt”. That is, it is determined that the rotational driving force of the gas engine 10 is not normally transmitted to the generator 30 because an abnormality has occurred in the power transmission belt 34.

  When the arithmetic device 71 determines in step S12 that “the power transmission belt is normal” (S12: Yes), the processing device 71 proceeds to step S13. In step S <b> 13, the arithmetic device 71 supplies a reset signal RES to the generator 30 and tries to restart power generation. Then, in step S14, the arithmetic unit 71 ends the power transmission belt abnormality determination process. On the other hand, when it is determined in step S12 that "an abnormality has occurred in the power transmission belt" (S12: No), the process proceeds to step S14, and the abnormality determination process for the power transmission belt is terminated.

  In step S13 of the power transmission belt abnormality determination process, the reset signal RES is supplied to the generator 30, whereby the electromagnetic clutch 33 of the generator 30 is connected. If the power transmission belt 34 is normal, the actual rotational speed of the rotor 32 increases and becomes greater than a predetermined rotor rotational speed. Then, the generator 30 supplies a restart signal RST to the control device 70. In this case, the arithmetic unit 71 stops the time measurement operation by the timer 73 (see FIG. 3). On the other hand, if the power transmission belt 34 is abnormal, the actual rotational speed of the rotor 32 does not increase and does not become larger than the predetermined rotor rotational speed, so that the restart signal RST is not supplied from the generator 30 to the control device 70. . In this case, the time measurement operation of the timer 73 is continued.

  When the measured time Δt exceeds a predetermined time T, the timer 73 supplies a timer interrupt signal TI to the control device 70 (see FIG. 4). Then, the arithmetic unit 71 supplies an error signal ERR indicating that an abnormality has occurred in the power transmission belt 34 to the indoor unit remote controller 50. When the error signal ERR is supplied, the indoor unit remote controller 50 notifies that an abnormality has occurred in the power transmission belt 34 using an image, sound, or the like.

  As described above, when an abnormality (for example, looseness) occurs in the power transmission belt 34, the actual rotational speed of the rotor 32 of the generator 30 decreases and the generator 30 automatically stops power generation. Even if the power transmission belt 34 is normal, when the actual rotational speed of the gas engine 10 temporarily decreases due to strong wind, misfire, etc., the actual rotational speed of the rotor 32 of the generator 30 decreases and the generator 30 Automatically stops power generation. Therefore, in the present embodiment, the control device 70 determines whether or not an abnormality has occurred in the power transmission belt 34 based on the difference ΔR between the target rotational speed TER and the actual rotational speed AER of the gas engine 10. That is, if the difference ΔR between the target rotational speed TER and the actual rotational speed AER of the gas engine 10 is larger than the predetermined threshold value RT, it is determined that “the power transmission belt is normal”. On the other hand, when the generator 30 is automatically stopped, if the difference ΔR between the target engine speed TER and the actual engine speed AER of the gas engine 10 is equal to or less than a predetermined threshold RT, “the power transmission belt is abnormal. Is determined. Therefore, according to the present embodiment, when the generator stops generating power, the presence / absence of abnormality relating to the power transmission belt 34 is always compared with the conventional device that determines that “an abnormality relating to the power transmission belt has occurred”. Can be determined accurately.

  In addition, a simple control device 70 similar to the conventional one can be used. That is, a sensor that directly detects the state of the power transmission belt 34, a sensor that detects the actual rotational speed of the generator 30, and an input terminal that inputs information supplied from these sensors are provided. There is no need to use a high-performance microcomputer capable of processing information.

  Further, when it is determined that “the power transmission belt is normal”, the control device 70 causes the generator 30 to resume power generation. According to this, power generation is automatically resumed. That is, manual operation for restarting power generation is not necessary.

  Further, when the actual rotational speed AER of the gas engine 10 temporarily decreases and the generator 30 is stopped, if the power transmission belt 34 is also abnormal, the determination result in step S12 of FIG. It is an error. In this case, even if the reset signal RES is supplied to the generator 30, the rotational driving force of the gas engine 10 is not normally transmitted to the generator 30, so the restart signal RST is not supplied from the generator 30 to the control device 70. Further, after the actual rotational speed AER of the gas engine 10 is temporarily reduced due to strong wind, misfire, etc., a certain amount of time (for example, about 10 seconds) is required until the actual rotational speed AER returns to the target rotational speed TER. Take it. Therefore, even if the power transmission belt 34 is actually normal, it takes some time from when the reset signal RES is supplied to the generator 30 to when the restart signal RST is supplied to the control device 70. Therefore, in the present embodiment, when the state in which the power generation by the generator 30 is stopped is continued for a predetermined time T, it is configured to notify that an abnormality has occurred in the power transmission belt 34. According to this, the presence or absence of abnormality regarding the power transmission belt 34 can be reported more accurately than the conventional device.

  As mentioned above, although embodiment of this invention was described, this invention should not be limited to the said embodiment.

  For example, when it is determined in step S12 of FIG. 2 that “an abnormality has occurred in the power transmission belt”, the error signal ERR may be immediately supplied to the indoor unit remote controller 50 to notify the abnormality. .

DESCRIPTION OF SYMBOLS 1 ... Self-supporting engine drive type air conditioner, 10 ... Gas engine (engine), 11 ... Gas piping, 12 ... Output shaft, 12a ... Engine speed sensor (Engine speed detector) ), 20 ... Air conditioning unit, 30 ... Generator, 31 ... Stator, 32 ... Rotor, 33 ... Electromagnetic clutch, 34 ... Power transmission belt, 40 ... Battery , 50 ... indoor unit remote control (notification device), 60 ... starter motor, 70 ... control device, 71 ... arithmetic device, 72 ... storage device, 73 ... timer, 100 ...・ Power transmission belt abnormality detection device, AER: actual rotation speed, C: commercial power supply, ERR: error signal, RES: reset signal, RST: restart signal, RT: threshold value , STP ... Stop signal, TER ... The target rotational speed, TI ··· interrupt signal

Claims (4)

The present invention relates to a power transmission belt for transmitting the rotational driving force of an engine to a generator that automatically stops power generation when the actual rotational speed of a rotor that generates electric power by rotating is reduced to a predetermined rotor rotational speed or less. An abnormality detection device for a power transmission belt that detects an abnormality,
A control device for setting a target rotational speed of the engine;
An engine speed detecting device for detecting an actual speed of the engine,
The control device detects the actual engine speed using the engine speed detection device when the generator is automatically stopped, and sets the target engine speed and the detected engine speed. A power transmission belt abnormality detection device that calculates a difference from an actual rotational speed and determines that an abnormality relating to the power transmission belt has occurred when the calculated difference is equal to or less than a predetermined threshold value. In the power transmission belt abnormality detection device according to claim 1,
The control device is a power transmission belt abnormality detection device that causes the generator to resume power generation when the calculated difference is greater than the predetermined threshold. In the power transmission belt abnormality detection device according to claim 2,
A notification device for notifying that an abnormality has occurred in the power transmission belt when the calculated difference is greater than the predetermined threshold and the generator has stopped generating power for a predetermined time; , Power transmission belt abnormality detection device. Power that detects abnormality related to the power transmission belt that transmits the rotational driving force of the engine to the generator that automatically stops power generation when the actual rotational speed of the rotor that rotates to generate electric power is equal to or lower than a predetermined rotational speed An abnormality detection method for a transmission belt,
When the generator is automatically stopped, the difference between the target engine speed and the actual engine speed is calculated, and when the calculated difference is equal to or less than a predetermined threshold, an abnormality related to the power transmission belt An abnormality detection method for a power transmission belt, in which it is determined that the power is generated.

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