Control device, electric compressor, method and program product for identifying a cause of a pulsating voltage anomaly

Abstract

Provided is a method of determining a source of an abnormal pulsating voltage when the abnormal pulsating voltage is detected. A control device is a control device of an electric compressor, which includes a detection unit that detects a pulsating voltage, a determination unit that determines whether the pulsating voltage is abnormal based on a value of the pulsating voltage, and a cause determination unit that determines whether the cause of the abnormality is the electric compressor or an external device other than the electric compressor based on a control result of the electric compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to a control device, an electric compressor, a method for determining a cause of a pulsating voltage anomaly, and a program. This application claims priority from Japanese Patent Application No. 2019-193695 filed on October 24, 2019, and the contents thereof are incorporated herein by reference. BACKGROUND

[0002] Among the components of an automotive air conditioner mounted on a vehicle, there is an electric compressor. In a drive circuit that drives the electric compressor, a pulsating voltage that vibrates at a prescribed cycle is generated. If the pulsating voltage becomes large, resonance occurs and an excessive current flows. The electric compressor is driven with a high-voltage battery as a power source. On this battery, in addition to the automotive air conditioner, a vehicle-side load is sometimes connected.

[0003] In Patent Literature 1, a technology is disclosed in which a pulsating voltage of a vehicle alternator is detected, and if the difference between the maximum value and the minimum value of the pulsating voltage exceeds a prescribed value, it is determined that the alternator has failed.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Publication No. 2004-135393 SUMMARY

[0007] TECHNICAL PROBLEM TO BE SOLVED BY THE INVENTION

[0008] In order to protect equipment from an excessive current generated due to resonance caused by a pulsating voltage, it is conceivable to stop control of the motor of the electric compressor. However, in a case where a vehicle-side load is connected to the battery, it is possible that a pulsating voltage is generated by the vehicle-side load. In order to deal with resonance caused by a pulsating voltage, it is necessary to distinguish the source of generation of the pulsating voltage that is a problem.

[0009] The present application provides a control device, an electric compressor, a method for determining a cause of a pulsating voltage anomaly, and a program that can solve the above-described problem.

[0010] MEANS FOR SOLVING THE TECHNICAL PROBLEM

[0011] The control device of the present application is a control device of an electric compressor, which includes a detection unit that detects a pulsating voltage, a determination unit that determines whether the pulsating voltage is abnormal based on the value of the pulsating voltage, and a cause determination unit that determines whether the cause of the abnormality is the electric compressor or an external device other than the electric compressor based on the control result of the electric compressor.

[0012] The electric compressor of the present application includes the above-described control device.

[0013] In the cause determination method of the pulsating voltage abnormality according to the present application, the control device detects a pulsating voltage, determines whether the pulsating voltage is abnormal based on a value of the pulsating voltage, and determines whether the cause of the abnormality is the control target device or a device other than the control target device based on a control result of the control target device.

[0014] The program according to the present application causes a computer to function as a means for detecting a pulsating voltage, a means for determining whether the pulsating voltage is abnormal based on a value of the pulsating voltage, and a means for determining whether the cause of the abnormality is a specified device or a device other than the specified device based on a control result of the specified device.

[0015] Effects of Invention

[0016] According to the control device, the electric compressor, the cause determination method of the pulsating voltage abnormality, and the program described above, when the pulsating voltage is abnormal, it is possible to determine a source of the pulsating voltage that becomes the cause of the abnormality. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a diagram showing an example of an electric compressor in an embodiment.

[0018] Figure 2 FIG. 1 is a diagram showing an example of an electric compressor in an embodiment.

[0019] Figure 3 FIG. 1 is a diagram showing an example of an electric compressor in an embodiment.

[0020] Figure 4 FIG. 1 is a diagram showing an example of an electric compressor in an embodiment.

[0021] Figure 5 FIG. 1 is a diagram showing an example of an electric compressor in an embodiment.

[0022] Figure 6 FIG. 1 is a diagram showing an example of an electric compressor in an embodiment. DETAILED DESCRIPTION

[0023] Embodiment

[0024] Hereinafter, with reference to Figures 1-6 , an electric compressor according to an embodiment will be described.

[0025] Structure

[0026] Figure 1An example of a schematic configuration of an electric compressor 20 provided in a vehicle air conditioner 30 is shown in FIG. 1. The illustrated battery 1, vehicle air conditioner 30, vehicle equipment 40, and circuits for driving these are mounted on a vehicle. The inductors 5a, 5b represent inductor components of the circuits including the battery 1, vehicle air conditioner 30, and vehicle equipment 40.

[0027] The battery 1 is a power supply unit mounted on the vehicle (outside the vehicle air conditioner 30). The battery 1 supplies high-voltage direct current to the vehicle air conditioner 30 and vehicle equipment 40. The vehicle equipment 40 is provided with a capacitor 2, an inverter 3, and a load 4 connected to the inverter 3. In the vehicle equipment 40, the inverter 3 converts high-voltage direct current supplied from the battery 1 into three-phase alternating current and supplies it to the load 4. If the carrier frequency of the inverter 3 is set to fl, a pulsating voltage of the frequency fl generated in the vehicle equipment 40 sometimes occurs in the circuit (described later).

[0028] The vehicle air conditioner 30 is provided with the electric compressor 20. The electric compressor 20 is an inverter-integrated electric compressor in which an inverter 7 is integrally assembled. The electric compressor 20 is provided with a power supply circuit 8 including the capacitor 6 and inverter 7, a motor 9, a control device 10, a voltage meter 11, a compression section 12, and a storage device 13. The electric compressor 20 is driven by the inverter 7 converting high-voltage direct current supplied from the battery 1 into three-phase alternating current and applying it to the motor 9. The inverter 7 and motor 9 are connected through a power line. The inverter 7 converts direct current supplied from the battery 1 into three-phase alternating current and supplies it to the motor 9. The inverter 7 is controlled by the control device 10. The control device 10 is provided with a microcomputer and controls the motor 9 to desired operation through the inverter 7 according to a control signal acquired from an ECU (Electric Control Unit) or the like not shown. For example, the control device 10 controls the rotational speed of the motor 9. The motor 9 is rotationally driven according to the instruction from the inverter 7, and thus the compression section 12 compresses refrigerant and supplies it to a refrigerant circuit (not shown) provided in the vehicle air conditioner 30. The inverter 7 and voltage meter 11 are connected to the control device 10 through a signal line. The voltage meter 11 detects direct current voltage input to the inverter 7 and outputs the detected voltage value to the control device 10. The voltage value measured by the voltage meter 11 includes a pulsating component. The value obtained by subtracting the direct current voltage value from the battery 1 from the voltage value measured by the voltage meter 11 is referred to as a pulsating voltage. If the carrier frequency of the inverter 7 is set to fo, a pulsating voltage of the frequency fo generated in the electric compressor 20 sometimes occurs in the circuit. If the pulsating voltage of the frequency fo or fl becomes large, resonance occurs in a resonance circuit formed by the capacitors 2, 6 and inductors 5a, 5b, and thus the electric compressor 20 and vehicle equipment 40 are sometimes driven at a frequency different from the carrier frequency of the inverter 7 or inverter 3. Figure 1excessive current flows in the circuit. Therefore, the control device 10 monitors a variation in the voltage value measured by the voltage meter 11, and if the value W of the pulsating voltage becomes equal to or greater than a prescribed threshold value a, determines that the pulsating voltage is abnormal, stops or slows down the motor 9, and performs control for suppressing the pulsating voltage. Thus, the pulsating voltage generated from the electric compressor 20 is suppressed. However, even if the motor 9 is slowed down, the pulsating voltage generated from the vehicle equipment 40 cannot be suppressed.

[0029] The control device 10 can control the electric compressor 20, but cannot control the vehicle equipment 40. That is, the control device 10 can suppress the pulsating voltage generated from the electric compressor 20, but cannot suppress the pulsating voltage generated from the vehicle equipment 40. In the control device 10, the value of the frequency fl can also be unknown.

[0030] The control device 10, if it detects an abnormality in the pulsating voltage using this property, performs cause discrimination processing that distinguishes whether the generation source of the pulsating voltage is the electric compressor 20 or the vehicle equipment 40. The control device 10 is connected to the storage device 13. The control device 10, if it detects an abnormality in the pulsating voltage, discriminates the generation source thereof, and in the case where the generation source is the vehicle equipment 40, records the generation of the abnormality in the pulsating voltage in the storage device 13.

[0031] The control device 10 includes a detection section 101, a determination section 102, a control section 103, a cause discrimination section 104, and a recording section 105.

[0032] The detection section 101 acquires the voltage value measured by the voltage meter 11. The detection section 101 calculates the pulsating voltage from the acquired voltage value by subtracting a prescribed direct-current voltage value based on the battery 1, and analyzes a variation in the pulsating voltage within a prescribed time. For example, the detection section 101 detects a difference between the maximum value and the minimum value of the voltage value acquired within a prescribed small time. This value is referred to as the value W of the pulsating voltage. The detection section 101 detects the value W of the pulsating voltage every small time. Among the pulsating voltages that are the detection targets of the detection section 101, the pulsating voltage generated from the electric compressor 20 (the inverter 7) can be included in addition to the pulsating voltage generated from the vehicle equipment 40 (the inverter 3).

[0033] The determination section 102 compares the value W of the pulsating voltage calculated by the detection section 101 with a prescribed threshold value a. In the case where the value W of the pulsating voltage is equal to or greater than the threshold value a, the determination section 102 determines that cause discrimination processing of an abnormal pulsating voltage is performed.

[0034] The control unit 103 instructs the inverter 7 on the rotational speed of the motor 9. If the determination unit 102 determines to perform cause determination processing, the control unit 103 stops the motor 9. Alternatively, the control unit 103 reduces the rotational speed of the motor 9 to a predetermined target rotational speed X (rpm). By stopping the motor 9 or reducing its rotational speed, the value W of the pulsating voltage generated by the electric compressor 20 can be reduced.

[0035] The cause determination unit 104 determines, based on the control result of the control unit 103 on the electric compressor 20 (motor 9), whether the source of the abnormal pulsating voltage is the electric compressor 20 or other external equipment (vehicle equipment 40).

[0036] If the cause determination unit 104 determines that the source of the abnormal pulsating voltage is the vehicle equipment 40, the recording unit 105 records the abnormality of the pulsating voltage detected as being caused by the vehicle equipment 40 in the storage device 13. The storage device 13 is, for example, a microcomputer equipped with a non-volatile storage medium.

[0037] (Cause identification and handling)

[0038] Next, use Figure 2 , Figure 3 Explain the cause identification and handling process.

[0039] Figure 2 Figure 1 illustrates the cause identification process in one embodiment.

[0040] Figure 2 The vertical axis of the above figure represents the value W of the pulsating voltage detected by the detection unit 101, and the horizontal axis represents time. Figure 2 In the diagram below, the vertical axis represents the rotational speed of motor 9, and the horizontal axis represents time. Figure 2 The above image and Figure 2 In the graph below, the same position on the horizontal axis represents the same time period. These are in... Figure 3 The same applies to China.

[0041] refer to Figure 2 In the diagram above, the value of the pulsating voltage W is 0 at time t0. (Reference) Figure 2 In the diagram below, the rotational speed of motor 9 at time t0 is Y (rpm). Y (rpm) is the required rotational speed determined by the vehicle's ECU based on the user-set cooling and heating temperatures.

[0042] At time t1, the value W of the pulsating voltage becomes higher than or equal to the threshold α. Based on the condition that W exceeds the threshold α, the determination unit 102 instructs the control unit 103 to begin cause determination processing. Therefore, the control unit 103 instructs the inverter 7 to operate at speed 0 (zero). Figure 2As shown by curve C1 in the above figure, when the source of the pulsating voltage is the electric compressor 20, the value W of the pulsating voltage decreases at time t1+1 after the motor 9 stops. On the other hand, when the source of the pulsating voltage is the vehicle equipment 40, it is independent of the operating state of the motor 9, such as... Figure 2 As shown by curve C2 in the figure above, after motor 9 stops, the value of the pulsating voltage W also remains above the threshold α.

[0043] The cause determination unit 104 determines, for example, whether the cause of the abnormal pulse voltage is the electric compressor 20 or the vehicle equipment 40, based on the value W of the pulse voltage detected at a predetermined time t2 after the motor 9 is stopped by the control unit 103.

[0044] For example, if the decrease in the value W before and after reducing the speed of motor 9 is greater than or equal to a predetermined first threshold, the cause determination unit 104 determines that the abnormal pulsating voltage is caused by the electric compressor 20; otherwise, it determines that the abnormal pulsating voltage is caused by the vehicle equipment 40. Alternatively, if the value W after reducing the speed of motor 9 is greater than or equal to a predetermined second threshold (e.g., threshold α), the cause determination unit 104 determines that the abnormal pulsating voltage is caused by the vehicle equipment 40; otherwise, it can determine that the abnormal pulsating voltage is caused by the electric compressor 20.

[0045] The control unit 103 can reduce the speed of the motor 9 instead of stopping the motor 9. Figure 3 Figure 2 illustrates the cause identification process in one implementation method.

[0046] and Figure 2 Similar to the previous case, at time t0, the value W of the pulsating voltage is 0, and the speed of motor 9 is Y (rpm). At time t1, the value W of the pulsating voltage exceeds the threshold α. The determination unit 102 determines the start of the cause determination process at time t1 based on the case where the value W is above the threshold α. The control unit 103 sets the value X (rpm), which is less than Y, as the target speed and instructs the speed X to the inverter 7. If the speed X is instructed at time t1, the speed of motor 9 gradually decreases, and decreases to X (rpm) at time t1-1. When the source of the pulsating voltage is the electric compressor 20, as shown by curve C1, the value W of the pulsating voltage decreases as the speed of motor 9 decreases. On the other hand, when the source of the pulsating voltage is the vehicle equipment 40, as shown by curve C2, the value W of the pulsating voltage remains above the threshold α, for example, regardless of the decrease in the speed of motor 9.

[0047] The cause determination unit 104 determines, for example, whether the cause of the abnormal pulsating voltage is the electric compressor 20 or the vehicle equipment 40, based on the value W of the pulsating voltage detected at a time t2 after a specified time has elapsed after the speed of the motor 9 reaches a specified speed X (rpm).

[0048] For example, in a case where the degree of reduction of the value W of the pulsation voltage before and after the reduction of the rotation speed of the motor 9 is equal to or greater than a first threshold value, the reason discriminating portion 104 discriminates that the reason for the abnormal pulsation voltage is the electric compressor 20, and in other cases, discriminates that it is the vehicle equipment 40. Alternatively, in a case where the value W of the pulsation voltage after the reduction of the rotation speed of the motor 9 is equal to or greater than a second threshold value (for example, the threshold value a), the reason discriminating portion 104 discriminates that the reason for the abnormal pulsation voltage is the vehicle equipment 40, and in other cases, can discriminate that it is the electric compressor 20.

[0049] In the reason discriminating process, the air conditioning can be continued even weakly by reducing the motor 9 to the target rotation speed X without stopping it.

[0050] In the case of stopping the motor 9 and the case of reducing the rotation speed of the motor 9, the values of the first threshold value and the second threshold value can be different.

[0051] Next, the flow of the reason discriminating process of the abnormal pulsation voltage according to the present embodiment will be described.

[0052] Figure 4 is a first flowchart showing an example of the reason discriminating process according to the present embodiment.

[0053] In the electric compressor 20, the motor 9 is driven at a required rotation speed Y corresponding to the air conditioning load of the vehicle air conditioner 30.

[0054] First, the detecting portion 101 detects the pulsation voltage (step S10). The detecting portion 101 detects the value W of the pulsation voltage from the voltage value measured by the voltage meter 11 within a prescribed time. The detecting portion 101 outputs the value W to the determining portion 102. The determining portion 102 determines whether the value W is equal to or greater than the threshold value a (step Sll). In a case where it is less than the threshold value a, (step Sll: No), the process from step S10 is repeated.

[0055] In a case where it is equal to or greater than the threshold value a (step Sll: Yes), the determining portion 102 instructs the control portion 103 to start the reason discriminating process. The determining portion 102 outputs the value W when it becomes equal to or greater than the threshold value a to the reason discriminating portion 104. The control portion 103 stops the motor 9 (step S12). The control portion 103 can reduce the rotation speed of the motor 9 to the target rotation speed X.

[0056] Next, if a predetermined time elapses after the motor 9 is stopped or the rotation speed is reduced, the detection section 101 detects the pulsation voltage (step S13). The detection section 101 outputs the value W of the pulsation voltage to the cause discrimination section 104. The cause discrimination section 104 calculates the degree of reduction of the value W before and after the rotation speed control of the motor 9. For example, the cause discrimination section 104 calculates the difference between the values W before and after the rotation speed control of the motor 9, and sets the difference as the degree of reduction. Alternatively, the cause discrimination section 104 calculates whether the calculated difference corresponds to a certain percentage of the value W before the rotation speed control of the motor 9, and sets the value as the degree of reduction. The cause discrimination section 104 compares the calculated degree of reduction with the first threshold value (step S14).

[0057] In the case where the degree of reduction is equal to or greater than the first threshold value (step S14: YES), the cause discrimination section 104 discriminates that the cause of the abnormal pulsation voltage is the electric compressor 20 (step S15).

[0058] In the case where the degree of reduction is less than the first threshold value (step S14: NO), the cause discrimination section 104 discriminates that the cause of the abnormal pulsation voltage is the vehicle equipment 40 (step S16). In the case where the cause is the vehicle equipment 40, the recording section 105 records the abnormal case of the pulsation voltage in which the vehicle equipment 40 is detected as the cause in the storage device 13 (step S17). For example, the recording section 105 records the time (time t2) at which the cause discrimination section 104 discriminates that the cause of the abnormal pulsation voltage is the vehicle equipment 40 in association with the detection of the abnormality. The detection section 101 also repeatedly performs the detection of the pulsation voltage after the time t2, and the cause discrimination section 104 calculates the degree of reduction from the difference between the value W of the pulsation voltage before the rotation speed control of the motor 9 and the value W of the latest pulsation voltage detected by the detection section 101 each time. Then, until the calculated degree of reduction becomes equal to or greater than the first threshold value, the recording section 105 continuously records the abnormal case of the pulsation voltage in which the vehicle equipment 40 is detected as the cause, for example, together with the time of the detection of the pulsation voltage, in the storage device 13.

[0059] The control section 103 also continuously maintains the operation state of the motor 9 which is stopped or in which the rotation speed is reduced in step S12 thereafter.

[0060] According to the present embodiment, in a case where there are a plurality of generation sources of the pulsating voltage and the abnormality of the pulsating voltage that can generate resonance is detected, the generation source of the pulsating voltage can be determined. Therefore, the abnormality of the pulsating voltage corresponding to the generation source can be coped with. For example, in a case where the device (the electric compressor 20) that is the control target is the generation source, resonance can be avoided by stopping the operation of the device. For example, in a case where the external device (the vehicle device 40) other than the control target is the generation source, a record table indicating the abnormality generation can be recorded in the storage device 13. Thus, the manufacturer of the electric compressor 20 can promote suppression of the generation of the abnormal pulsating voltage by providing the record table recorded in the storage device 13 to the manufacturer of the vehicle device 40.

[0061] In the flowchart of Figure 4 , the degree of reduction of the value W of the pulsating voltage is compared with the first threshold value, and the example of determining the generation source of the pulsating voltage is explained, but the generation source can be determined from the value W after the reduction of the rotation speed of the motor 9. In the flowchart of Figure 4 , after the abnormality of the pulsating voltage is detected, the state of stopping the motor 9 or reducing the rotation speed is maintained, but in a case where safety can be confirmed, the rotation speed of the motor 9 can be restored to the required rotation speed Y. Then, the case where these processes are performed is explained. As for the same processes as Figure 5 , a simple explanation is given. Figure 4

[0062] Figure 5 is the second flowchart indicating an example of the cause determination process in the embodiment.

[0063] First, the detection unit 101 detects the pulsating voltage (step S10). Then, the determination unit 102 determines whether the value W of the pulsating voltage is equal to or greater than the threshold value a (step Sll). In a case where it is less than the threshold value a (step Sll: No), the processes from step S10 are repeated. In a case where it is equal to or greater than the threshold value a (step Sll: Yes), the determination unit 102 instructs the control unit 103 to start the cause determination process. The control unit 103 stops the motor 9 (step S12). Then, if a predetermined time elapses after the motor 9 is stopped, the detection unit 101 detects the pulsating voltage (step S13). The cause determination unit 104 compares the value W of the pulsating voltage after the motor 9 is stopped, which is detected by the detection unit 101, with the second threshold value (step S141).

[0064] ​In a case where the value W of the pulsation voltage is smaller than the second threshold value (step S141: No), the cause discrimination unit 104 discriminates that the cause of the abnormal pulsation voltage is the electric compressor 20 (step S15). The cause discrimination unit 104 outputs the discrimination result to the control unit 103. The abnormality of the pulsation voltage is likely to be caused by the transient phenomenon. In this case, if the transient phenomenon converges, the abnormality of the pulsation voltage does not occur either. Therefore, the control unit 103, after a lapse of a prescribed time T1, causes the rotation speed of the motor 9 to rise to the required rotation speed Y (step S19). In a case where the abnormality of the pulsation voltage does not occur even if the rotation speed of the motor 9 is caused to rise, the control unit 103 maintains the rotation speed of the motor 9. In a case where the abnormality of the pulsation voltage occurs, the control unit 103, if the motor 9 is stopped again and a time T1 elapses, repeats the control to cause the rotation speed of the motor 9 to rise to the required rotation speed Y until the abnormality of the pulsation voltage does not occur or the number of times of restarting the motor reaches a prescribed upper limit number of times. In a case where the abnormality of the pulsation voltage occurs even if the motor is restarted several times, the control unit 103 causes the motor 9 to remain stopped. Thereby, while resonance caused by the pulsation voltage can be prevented, air conditioning based on the vehicle air conditioner 30 is performed, and reduction in comfort of the user is suppressed. In step S12, in a case where the rotation speed of the motor 9 is reduced to X (rpm), the same control can be performed. The control unit 103 can not cause the rotation speed of the motor 9 to rise to Y (rpm) at once, but can cause the rotation speed to rise to the required rotation speed Y in stages. In this case, the control unit 103 can cause the rotation speed of the motor 9 to rise to the maximum rotation speed at which the abnormality of the pulsation voltage does not occur even if the rotation speed cannot be caused to rise to Y, and can continue to remain running.

[0065] On the other hand, in a case where the value W of the pulsation voltage is equal to or more than the second threshold value (step S141: YES), the cause discrimination unit 104 discriminates that the cause of the abnormal pulsation voltage is the vehicle equipment 40 (step S16). The recording unit 105 records the case where the abnormal pulsation voltage caused by the vehicle equipment 40 is detected in the storage device 13 (step S17). Normally, the frequency fl of the pulsation voltage generated from the vehicle equipment 40 is different from the frequency fo of the pulsation voltage generated from the electric compressor 20, and the threshold value for determining the resonance generation is also normally different. For example, in a case where fl and fo are different, or in a case where the threshold value for determining that the vehicle equipment 40 generates the resonance is larger than the threshold value a, when the electric compressor 20 is caused to start, even if the pulsation voltage caused by the electric compressor 20, which has the value W smaller than the threshold value a, is generated, the resonance caused thereby is not generated in the circuit. Thus, for example, in a case where information on the property of the pulsation voltage can be obtained in advance from the manufacturer of the vehicle equipment 40, and even if the electric compressor 20 is restarted and is safe, (fo and fl are different, or the threshold value with respect to fl is sufficiently larger than the threshold value a), the control unit 103 causes the rotation speed of the motor 9 to rise to the required rotation speed Y (step S18). Thereby, it is possible to quickly restore the air conditioning capacity of the vehicle air conditioner 30, and to suppress the reduction in the user's comfort. After the rotation speed of the motor 9 is caused to rise, the control device 10 also performs the process starting from step S10.

[0066] According to the present embodiment, if the value W of the pulsation voltage becomes equal to or more than the threshold value, it is determined that the resonance is likely to be generated in the circuit, and the rotation speed of the motor 9 of the electric compressor 20 is reduced. Then, the cause of the abnormal pulsation voltage is discriminated on the basis of the change in the pulsation voltage caused by the rotation speed reduction. In a case where the cause of the abnormal pulsation voltage is the electric compressor 20, by appropriately controlling the motor 9, it is possible to prevent the resonance generated in the circuit, and it is possible to prevent the electric compressor 20 and the like from being damaged.

[0067] In a case where the cause of the abnormal pulsation voltage is the vehicle equipment 40, by recording the record table in which the abnormality generation is recorded, it is possible to leave evidence of the abnormal pulsation voltage generated by the vehicle equipment 40 as the cause. By providing the recorded record table to the manufacturer of the vehicle equipment 40, it is possible to request that the generation of the abnormal pulsation voltage be suppressed.

[0068] After the generation source of the abnormal pulsation voltage is discriminated, within a range in which safety can be ensured, air conditioning is performed by the vehicle air conditioner 30 by driving the motor 9, and thereby it is possible to improve the reduction in the user's comfort.

[0069] Figure 6 FIG. 1 is a diagram showing an example of a hardware structure of a control device and the like in an embodiment.

[0070] The computer 900 is provided with a CPU 901, a main storage device 902, an auxiliary storage device 903, an input / output interface 904, and a communication interface 905.

[0071] The control device 10 and the storage device 13 described above are installed in the computer 900. Further, each of the functions described above is stored in the auxiliary storage device 903 in the form of a program. The CPU 901 reads the program from the auxiliary storage device 903 and expands it to the main storage device 902, and executes the processing described above according to the program. The CPU 901 secures a storage area in the main storage device 902 according to the program. The CPU 901 secures a storage area for data in the processing in the auxiliary storage device 903 according to the program.

[0072] The program for realizing all or a part of the functions of the control device 10 and the storage device 13 can be recorded in a computer-readable recording medium, and the processing based on each of the functions can be performed by causing a computer to read and execute the program recorded in the recording medium. Here, the "computer system" means a system including an OS, hardware such as a peripheral device, and the like. If it is a case using a WWW system, the "computer system" also includes a web page providing environment (or a display environment). Further, the "computer-readable recording medium" means a portable medium such as a CD, a DVD, a USB, a storage device such as a hard disk built in a computer system. In a case where the program is distributed to the computer 900 through a communication line, the computer 900 that receives the distribution can expand the program to the main storage device 902 and execute the processing described above. The program described above can be used to realize a part of the functions described above, and can also be able to realize the functions described above by being combined with a program already recorded in a computer system.

[0073] As described above, the several embodiments related to the present application have been described, but all of these embodiments are presented as examples, and the scope of the application is not intentionally limited. These embodiments can be implemented in other various ways, and various omissions, substitutions, and changes can be made within the scope of the gist of the application, and these embodiments and modifications thereof are included in the scope or gist of the application, and are also included in the scope of the application and equivalents thereof described in the technical solution.

[0074] For example, the detection unit 101, the determination unit 102, the cause determination unit 104, and the recording unit 105 of the present embodiment can be installed on different computers from the control device 10 of the electric compressor 20.

[0075] <Notes>

[0076] The control device 10, the electric compressor 20, the cause determination method of the pulsating voltage abnormality, and the program described in each of the embodiments are grasped, for example, as follows.

[0077] (1) The control device 10 according to a first aspect is a control device 10 of an electric compressor 20, and includes a detection unit 101 configured to detect a pulsation voltage, a determination unit 102 configured to determine whether the pulsation voltage is abnormal based on a value W of the pulsation voltage, and a cause determination unit 104 configured to determine whether the cause of the abnormality is the electric compressor or an external device other than the electric compressor based on a control result of the electric compressor.

[0078] According to the control device 10, when an abnormality in the pulsation voltage is detected, the source of the pulsation voltage can be determined. Thus, for example, control corresponding to the source can be performed to avoid generation of resonance caused by the abnormality in the pulsation voltage.

[0079] (2) The control device 10 according to a second aspect further includes a control unit 103 configured to control a rotational speed of a motor 9 included in the electric compressor 20, and if the determination unit 102 determines that the pulsation voltage is abnormal, the control unit 103 reduces the rotational speed of the motor 9. In a case where a degree of reduction in the value W of the pulsation voltage before and after the reduction in the rotational speed of the motor 9 is equal to or greater than a first threshold value, the cause determination unit 104 determines that the cause is the electric compressor 20. In a case where the degree of reduction is less than the first threshold value, the cause determination unit 104 determines that the cause is the external device (vehicle device 40).

[0080] By monitoring the degree of reduction in the value W of the pulsation voltage caused by reducing (including stopping) the rotational speed of the motor 9 of the electric compressor 20, in a case where the degree of reduction is large (in a case where the reduction in the rotational speed of the motor 9 greatly affects the pulsation voltage), it can be determined that the cause of the abnormal pulsation voltage is the electric compressor 20, and in a case other than this, it can be determined that the cause is the vehicle device 40.

[0081] (3) The control device 10 according to a third aspect further includes a control unit 103 configured to control a rotational speed of a motor 9 included in the electric compressor 20, and if the determination unit 102 determines that the pulsation voltage is abnormal, the control unit 103 reduces the rotational speed of the motor 9. In a case where the value W of the pulsation voltage after the reduction in the rotational speed of the motor 9 is equal to or greater than a second threshold value, the cause determination unit 104 determines that the cause is the external device (vehicle device 40). In a case where the value W of the pulsation voltage is less than the second threshold value, the cause determination unit 104 determines that the cause is the electric compressor 20.

[0082] By monitoring the value W of the pulsation voltage after the reduction (including stop) of the rotational speed of the motor 9 of the electric compressor 20, in the case where the value W becomes lower than the second threshold value (in the case where the reduction of the rotational speed of the motor 9 greatly affects the reduction of the value W), it is possible to determine that the electric compressor 20 is the cause of the abnormal pulsation voltage, and in other cases, it is possible to determine that the vehicle equipment 40 is the cause.

[0083] (4) The control device 10 according to the fourth aspect, in the control device 10 according to any one of the aspects (2) to (3), wherein, in the case where the cause is determined by the cause determination section 104 to be the external device (vehicle equipment 40), the control section 103 restores the rotational speed of the motor 9 to the rotational speed Y before the reduction.

[0084] In the case where the cause of the abnormal pulsation voltage is the vehicle equipment 40 and is not related to the operation of the electric compressor 20, it is possible to raise the rotational speed of the motor 9 to the original required rotational speed Y.

[0085] (5) The control device 10 according to the fifth aspect, in the control device 10 according to any one of the aspects (2) to (4), wherein, in the case where the cause is determined by the cause determination section 104 to be the electric compressor 20, the control section 103 maintains the rotational speed of the motor 9 at the rotational speed after the reduction.

[0086] In the case where the cause of the abnormal pulsation voltage is the electric compressor 20, by maintaining the state where the rotational speed of the motor 9 is reduced (including stopped), it is possible to avoid the generation of resonance.

[0087] (6) The control device 10 according to the sixth aspect, in the control device 10 according to any one of the aspects (2) to (4), wherein, in the case where the cause is determined by the cause determination section 104 to be the electric compressor 20, the control section 103 controls the value W of the pulsation voltage to be lower than the prescribed threshold value a while raising the rotational speed of the motor 9 toward the rotational speed Y before the reduction.

[0088] In the case where the cause of the abnormal pulsation voltage is the electric compressor 20, by controlling the value W of the pulsation voltage to be lower than the threshold value a while raising the rotational speed of the motor 9, it is possible to restore the capacity of the electric compressor 20.

[0089] (7) The control device 10 according to the seventh aspect, in the control device 10 according to any one of the aspects (1) to (6), further comprising a recording section 105 that records the cause in a storage device, wherein, in the case where the cause is determined by the cause determination section 104 to be the external device (vehicle equipment 40), the recording section 105 records the detection of the abnormality of the pulsation voltage caused by the external device (vehicle equipment 40).

[0090] In a case where the cause of the abnormal pulsating voltage is the vehicle device 40, the control device 10 cannot control the vehicle device 40, and thus cannot suppress the abnormal pulsating voltage, but by recording the detection of the abnormal pulsating voltage using the recording section 105, evidence of the generation of the abnormal pulsating voltage caused by the vehicle device 40 can be left.

[0091] (8) The electric compressor 20 according to the eighth aspect includes the control device according to any one of the first to seventh aspects.

[0092] (9) In the cause discrimination method of the abnormal pulsating voltage according to the ninth aspect, the control device 10 detects a pulsating voltage, discriminates whether the pulsating voltage is abnormal based on a value W of the pulsating voltage, and discriminates whether the cause of the abnormality is the control target device (the electric compressor 20) or a device other than the control target device (the vehicle device 40) based on a control result of the control target device (the electric compressor 20).

[0093] (10) The program according to the tenth aspect causes a computer to function as: a means for detecting a pulsating voltage; a means for discriminating whether the pulsating voltage is abnormal based on a value W of the pulsating voltage; and a means for discriminating whether the cause of the abnormality is a prescribed device or a device other than the prescribed device based on a control result of the prescribed device.

[0094] Industrial Applicability

[0095] According to the above-described control device, electric compressor, cause discrimination method of an abnormal pulsating voltage, and program, when the pulsating voltage is abnormal, the source of the generation of the pulsating voltage that is the cause of the abnormality can be discriminated.

[0096] Explanation of Symbols

[0097] 1 - battery, 2 - capacitor, 3 - inverter, 4 - load, 5a, 5b - inductor, 6 - capacitor, 7 - inverter, 8 - power supply circuit, 9 - motor, 10 - control device, 101 - detection section, 102 - discrimination section, 103 - control section, 104 - cause discrimination section, 105 - recording section, 11 - voltage meter, 12 - compression section, 13 - storage device, 20 - electric compressor, 30 - vehicle air conditioner, 40 - vehicle device, 900 - computer, 901 - CPU, 902 - main storage device, 903 - auxiliary storage device, 904 - input / output interface, 905 - communication interface.

Claims

1. A control device for an electric compressor, comprising: The detection department detects pulsating voltage. The determination unit determines whether the pulsating voltage is abnormal based on the value of the pulsating voltage. The control unit controls the rotational speed of the motor in the electric compressor. If the determination unit determines that the pulsating voltage is abnormal, the control unit reduces the rotational speed of the motor to suppress the pulsating voltage. The cause determination unit determines, based on the change in the pulsating voltage caused by the decrease in rotational speed, whether the cause of the abnormality is the electric compressor or other external equipment.

2. The control device according to claim 1, wherein, If the decrease in the value of the pulsating voltage before and after reducing the rotational speed is greater than or equal to a predetermined first threshold, the cause determination unit determines that the cause is the electric compressor; if the decrease is less than the first threshold, the cause is determined to be the external device.

3. The control device according to claim 1, wherein, If the value of the pulsating voltage after reducing the rotational speed is above a predetermined second threshold, the cause determination unit determines that the cause is the external device; if the value of the pulsating voltage is less than the second threshold, the cause is determined to be the electric compressor.

4. The control device according to any one of claims 2 to 3, wherein, If the cause is determined by the cause determination unit to be the external device, then... The control unit restores the motor's rotational speed to the speed it was before it was reduced.

5. The control device according to any one of claims 2 to 3, wherein, If the cause is determined by the cause determination unit to be the electric compressor, then... The control unit maintains the motor speed at the reduced speed.

6. The control device according to any one of claims 2 to 3, wherein, If the cause is determined by the cause determination unit to be the electric compressor, then... While controlling the value of the pulsating voltage below a specified threshold, the control unit increases the speed of the motor towards the speed before the voltage was reduced.

7. The control device according to any one of claims 1 to 3, further comprising: The recording unit records the cause in the storage device. If the cause is determined by the cause determination unit to be the external device, the recording unit records the abnormality of the pulsating voltage detected as being caused by the external device.

8. An electric compressor comprising the control device according to any one of claims 1 to 7.

9. A method for determining the cause of abnormal pulsating voltage, wherein, The control device performs the following processing: Detecting pulsating voltage; Based on the value of the pulsating voltage, determine whether the pulsating voltage is abnormal; The motor speed is controlled, and if the pulsating voltage is determined to be abnormal, the motor speed is reduced to suppress the pulsating voltage. and Based on the change in the pulsating voltage caused by the decrease in rotational speed, determine whether the cause of the abnormality is the electric compressor equipment or other equipment.

10. A program product comprising a program for enabling a computer to function as a mechanism: A mechanism for detecting pulsating voltage; A mechanism for determining whether the pulsating voltage is abnormal based on the value of the pulsating voltage; A mechanism that controls the motor speed and, if the pulsating voltage is determined to be abnormal, reduces the motor speed to suppress the pulsating voltage; and The cause of the anomaly can be determined by the change in the pulsating voltage caused by the decrease in rotational speed, whether it is caused by the electric compressor or by a mechanism of other equipment.

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