TWI656352B - Fault detection device for rotating electric machine - Google Patents

Abstract

The fault detection device (70) is applicable to a system (10, 110). The system (10, 110) includes: a rotating electric machine (30, 130), which is connected to the engine (20) to transmit power; an inverter (50), Power conversion is performed between the rotating electric machine and the DC power supply (40); and the phase control section (60) controls the phase of each phase of the inverter on / off during power conversion according to the operating state of the engine. The failure detection device includes a memory section (71) and a failure determination section (72). The memory section stores the phases of the rotating electric machine that are controlled according to the operating state of the engine during power conversion. The failure determination unit determines the failure of the rotating electric machine based on the deviation between the phase at the time of power conversion controlled by the phase control unit and the phase at the time of normal power conversion of the rotating electrical machine memorized by the memory unit.

Description

Fault detection device for rotating electric machine

[0001] The present disclosure relates to fault detection technology for rotating electrical machines.

[0002] For example, Patent Document 1 discloses the following failure detection. When the output torque of the AC motor is less than the torque command value, the voltage phase of the rectangular wave voltage is increased within a range below a predetermined upper limit phase. When the voltage phase and the upper limit phase are kept consistent for a predetermined time, the abnormality of the inverter is detected. In the technique described in Patent Document 1, the upper limit phase is set to a predetermined value in advance. This is because in the AC motor, the voltage phase system in which the output torque becomes maximum becomes a constant value. [Prior Art Document] [Patent Document] [0003] [Patent Document 1] JP 2010-119268

[Problems to be Solved by the Invention] 0004 [0004] However, in the technology described in Patent Document 1, unless the voltage phase and the upper limit phase agree, and the state continues for a predetermined time, an abnormality of the inverter cannot be detected. That is, conventionally, a predetermined period of time is required to detect an abnormality of the inverter. Therefore, the abnormality of the inverter cannot be detected early, and there is room for improvement. [0005] The present disclosure provides a fault detection technique for a rotating electric machine that can detect a fault early and correctly. [Means for Solving the Problems] [0006] A fault detection device according to one aspect of the technology of the present disclosure has the following configuration. [0007] The fault detection device (70) of the present disclosure is suitable for a system person having an engine (20), a rotating electric machine (30, 130), a DC power supply (40), an inverter (50), and a phase control unit (60) . The rotating electric machine is connected to the engine to transmit power. Inverter is used to convert power between rotating electric machine and DC power supply. The phase control unit controls the phase of each phase of the turn-on / turn-off inverter during power conversion according to the running state of the engine. The failure detection device includes a memory unit (71) and a failure determination unit (72). The memory section memorizes the phase that is controlled in accordance with the operating state of the engine during power conversion when the rotating electrical machine is normal. The failure determination unit determines the failure of the rotating electric machine based on the deviation between the phase at the time of power conversion controlled by the phase control unit and the phase at the time of normal power conversion of the rotating electric machine memorized by the memory unit. [0008] According to the above configuration, in the system of the present disclosure, the engine is connected to the rotating electric machine so as to transmit power. Therefore, for example, the rotating electric machine can be powered by the driving force of the engine, or the driving force of the engine can be boosted by the driving force of the rotating electric machine. In addition, the inverter performs power conversion between the rotating electrical machine and the DC power source. In the disclosed system, the phase control unit controls the phase of each phase of the inverter during power conversion according to the operating state of the engine. [0009] At this time, in the case of a rotating electrical machine failure, the phase that is controlled during the power conversion by the inverter will deviate from the normal phase. Therefore, in the fault detection device of the present disclosure, the failure of the rotating electric machine can be determined based on the deviation between the phase at the time of power conversion controlled by the phase control section and the phase at the time of normal power conversion of the rotating electrical machine memorized by the memory section. Furthermore, the memory unit memorizes the phase that is controlled in accordance with the operating state of the engine during power conversion when the rotating electric machine is normal. Therefore, the fault detection device disclosed in this disclosure can reflect the running state of the engine, determine the failure of the rotating electric machine, and detect the failure of the rotating electric machine early and correctly. [0010] The phase of each phase of the inverter is turned on / off, and includes a correction amount (control amount) for correcting the phase. The rotating electric machine may be at least one of generating power and driving.

[0012] The form of implementing the technology of the present disclosure will be described in detail below with reference to the drawings. <First Embodiment> This embodiment describes an example in which the technology of the present disclosure is applied to a system such as a motorcycle (vehicle). [0013] As illustrated in FIG. 1, the system 10 includes an engine 20, an MG (Motor Generator) 30, a DC power source 40, an inverter 50, a voltage phase control amount calculation unit (hereinafter referred to as a "control amount calculation unit" ") 60, fault detection device 70, 1 or a plurality of supplementary machines 80, etc. [0014] The engine 20 generates power by burning fuel. The engine 20 may be, for example, a gasoline engine, a diesel engine, or another engine. [0015] MG30 is a generator with starter function. The MG30 in this embodiment is equivalent to a three-phase rotary electric machine. Therefore, the MG30 of this embodiment has the functions of a three-phase AC motor and a three-phase AC generator. The MG 30 includes a U-phase winding 31, a V-phase winding 32, and a W-phase winding 33 as stator windings. One end of the windings 31, 32, and 33 of each phase is connected to the neutral point in common. The rotor of MG30 is equipped with a magnet. The rotor is directly connected to a crank shaft of the engine 20. That is, the engine 20 and the MG30 are connected so that power can be transmitted. An angular position sensor 36 that detects the angular position of the rotor is mounted on the MG 30. [0016] The DC power source 40 is a secondary battery or a capacitor formed of a Pb battery, a Li-ion battery, a NiH battery, or the like. The voltage Vdc of the DC power source 40 is detected by a voltage sensor (not shown). When the MG30 generates power, the voltage sensor detects the MG30's power generation voltage. [0017] An inverter 50 is connected between the MG 30 and the DC power source 40. The inverter 50 of this embodiment is a three-phase inverter including a U-phase arm, a V-phase arm, and a W-phase arm. Each phase arm includes two switching elements connected in series between a positive electrode and a negative electrode of the DC power source 40. The diodes are connected in antiparallel to the switching elements, respectively. The on / off of the switching element is controlled by the applied voltages Vu, Vv, and Vw (applied voltage command values) from the control amount calculation section 60. The applied voltages Vu, Vv, and Vw are calculated based on the voltage phase control amounts calculated by the control amount calculation section 60. Each phase arm is connected to the other ends of the windings 31, 32, 33 of each phase. [0018] The DC power source 40 and the inverter 50 are connected with one or more supplementary machines 80. The supplementary machine 80 includes, for example, a headlight, a dimmer switch, a turn signal, a brake light, a horn (siren), and the like. In addition, the dimming on relationship is used to switch the optical axis of the headlight to a downward direction (switching to a long distance beam and a short distance beam). [0019] The control amount calculation unit 60 and the failure detection device 70 are configured by an ECU including a CPU, a ROM, a RAM, an I / O (input / output interface), and the like. Examples of the ECU include MGECU, engine ECU, and hybrid ECU. MGECU controls MG30. The engine ECU controls the engine 20. Hybrid ECU is a higher-level ECU that controls MGECU and engine ECU. [0020] The control amount calculation unit 60 is input with the rotation speed Ne of the crank shaft directly connected to the rotor of the MG 30. The angular velocity ω can be calculated by time-differentiating the angular position θ of the rotor of MG30. This angular velocity ω corresponds to the rotation speed (the rotation speed of the engine 20) Ne of the crank shaft directly connected to the rotor of the MG30. The control amount calculation unit 60 receives a voltage Vdc detected by the voltage sensor. [0021] The control amount calculation unit 60 of this embodiment includes a phase control unit that controls the phase of each phase of the inverter 50 on / off during power conversion according to the operating state of the engine 20. The control amount calculation unit 60 executes the calculation of the voltage phase control amount (performs the lead / lag phase control of the voltage phase control amount) according to the processing sequence illustrated in the flowchart of FIG. 2. This series of processing is repeatedly executed by the control amount calculation unit 60 at a predetermined cycle. In this embodiment, an example of a case where MG30 performs power generation will be described. Specifically, in the case where MG30 performs power generation, the control amount calculation unit 60 repeatedly sets each phase of the inverter 50 according to the rotation angle (electrical angle) of the rotor to be turned on during 180 ° and turned off during 180 ° Off. [0022] The control amount calculation unit 60 of this embodiment sets an initial value for the voltage phase control amount (step S11). The voltage phase control amount is a lead phase amount / lag phase amount of the applied voltages Vu, Vv, and Vw relative to the magnetic pole position sensor signal. The initial value is the voltage phase control amount at the idle speed of the engine 20 when the MG30 is normal. That is, the initial value is a normal value at idle. [0023] Next, the control amount calculation unit 60 determines whether the target power generation voltage is higher than the current power generation voltage (step S12). The target power generation voltage is set according to the operation state of one or more supplementary machines 80 (electrical load of the supplementary machine 80). For example, the greater the number of supplementary machines 80 in operation, the greater the electrical load. Therefore, the target power generation voltage is set to be high. The generated voltage is detected by the voltage sensor. [0024] When the control amount calculation unit 60 determines that the target power generation voltage is higher than the current power generation voltage (step S12: YES), it calculates the lag phase addition amount (step S13). The hysteresis phase addition amount is an amount that lags the phases of the applied voltages Vu, Vv, and Vw with respect to the signal of the magnetic pole position sensor. In this embodiment, by setting the phase of the switch to lag, the amount of power generation can be increased. In the present embodiment, the relationship between the difference ΔV between the target power generation voltage and the current power generation voltage (ΔV = target power generation voltage-current power generation voltage) and the lag phase addition amount is set in advance in a table. That is, in this embodiment, the correspondence between the difference ΔV and the lag phase addition amount is established as map data, and the map data is stored in advance in a memory device provided in the memory control amount calculation unit 60. Therefore, the control amount calculation unit 60 refers to the table and calculates the lag phase addition amount based on the difference ΔV. The table may be set in accordance with the rotation speed Ne of the engine 20. [0025] Next, the control amount calculation unit 60 adds the lag phase addition amount to the voltage phase control amount set in the process of step S11, and calculates the voltage phase control amount (step S14). The control amount calculation unit 60 once ends (ends) this series of processing. [0026] On the other hand, when the control amount calculation unit 60 determines that the target power generation voltage is lower than the current power generation voltage (step S12: No), it calculates the leading phase addition amount (step S15). The advanced phase addition amount is an amount (phase angle) that advances the phases of the applied voltages Vu, Vv, and Vw to the signals of the magnetic pole position sensor. In this embodiment, the amount of power generation can be reduced by advancing the phase of the switch. In addition, in this embodiment, the relationship between the difference ΔV between the target power generation voltage and the current power generation voltage and the leading phase addition amount is set in the table in advance. The control amount calculation unit 60 refers to this table and calculates the advanced phase addition amount based on the difference ΔV. The table may be set in accordance with the rotation speed Ne of the engine 20. [0027] Next, the control amount calculation unit 60 calculates the voltage phase control amount by subtracting the advanced phase addition amount from the voltage phase control amount set in the process of step S11 (step S16). The control amount calculation unit 60 once ends (ends) this series of processing. [0028] The failure detection device 70 includes a memory section 71 and a failure determination section 72. The memory section 71 is a non-volatile memory. The storage unit 71 is composed of a ROM, a rewritable nonvolatile memory, a backup RAM, and the like. The memory section 71 stores a voltage phase (a voltage phase control amount in a normal state) that is controlled based on the operating state of the engine 20 during power conversion of the inverter 50 when the MG 30 is normal. Specifically, as shown in the example of FIG. 3, in the memory section 71, the relationship between the magnitude of the electrical load when the MG30 is normal, the speed of the engine 20, the speed of rotation Ne, and the voltage phase control amount of the inverter 50 is used as mapping data and Remember it. The memorized data is a value measured by, for example, performing a predetermined experiment or the like when the MG30 is normal. The mapping data associates the value of the electrical load with the value of the rotation speed Ne of the engine 20 and the value of the voltage phase control amount of the inverter 50 in correspondence. That is, the information used to indicate the operating state of the engine 20 includes the electrical load of the supplementary machine 80 and the rotation speed Ne of the engine 20. In the memory unit 71, a failure determination threshold value (a reference value for determining a failure) of a deviation amount of the voltage phase control amount and / or a deviation amount of the voltage phase control amount with respect to a speed of change described later is used as data and memorized. Of it. [0029] The exemplary relationship of FIG. 3 is a case where the MG30 performs power generation. For example, as the electrical load becomes larger and the rotation speed Ne of the engine 20 becomes slower, the voltage phase control amount of the inverter 50 becomes a lag phase. The voltage phase control amount (voltage phase) may be stored in at least one of the U-phase, V-phase, and W-phase. [0030] The failure determination unit 72 detects a failure of the MG 30 according to the sequence illustrated in the flowchart of FIG. 4. This series of processes is repeatedly executed by the failure determination unit 72 at a predetermined cycle when the MG 30 generates power. In this embodiment, a case where MG30 performs power generation is described as an example. [0031] The fault determination unit 72 of this embodiment controls the voltage phase control amount in the normal state (the normal time in the memory section 71 when the current voltage phase control amount (actual control amount) corresponds to the running state of the engine 20 at that time. Data) is calculated (step S21). The voltage phase control amount in the normal state can be obtained by reading the voltage phase control amount corresponding to the current operating state of the engine 20 by referring to the map data of FIG. 3 stored in the memory section 71. The current voltage phase control amount is a voltage phase control amount used for the control of the inverter 50 in the current operating state of the engine 20, and it can be obtained by input from the control amount calculation section 60. The failure determination unit 72 subtracts the voltage phase control amount in the normal state from the current voltage phase control amount. Based on this, the failure determination unit 72 calculates the amount of deviation (amount of deviation = current voltage phase control amount-normal voltage phase control amount). [0032] Next, the failure determination unit 72 determines whether the deviation amount calculated in the process of step S21 is greater than the failure determination threshold value (step S22). The failure judgment threshold (equivalent to a prescribed amount) is set to a prescribed deviation amount that does not occur during normal MG30. When the failure determination unit 72 determines that the amount of deviation is larger than the failure determination threshold (step S22: YES), it is determined that the MG 30 is abnormal (step S23). That is, the failure determination unit 72 determines that the MG 30 has failed. Specifically, the process of step S23 sets the failure determination flag to a high level (1). In addition, the failure of MG30 can be considered as a disconnection or short circuit of any of the windings 31, 32, and 33 of each phase. The failure determination unit 72 once ends (ends) this series of processing. [0033] On the other hand, in the determination processing of step S22, the failure determination unit 72 determines that the deviation amount is below the failure determination threshold (step S22: No), and determines that there is no abnormality in MG30 (step S24). That is, the failure determination unit 72 determines that the MG 30 is not broken. Specifically, the processing of step S24 is to set the failure determination flag to a low level (0). In this case, the failure determination unit 72 may determine that there is a possibility that the MG30 is abnormal depending on the magnitude of the deviation, or temporarily determine that the MG30 is abnormal. The failure determination unit 72 once ends (ends) this series of processing. [0034] FIG. 5 is a sequence diagram of an example of fault detection in this embodiment. [0035] Prior to time t1, the voltage phase control amount (actual voltage phase control amount) at this time is calculated according to the electrical load of the supplementary machine 80. In this sequence, the actual voltage phase control amount is the same as the voltage phase control amount (normal time data) during normal time. Therefore, the deviation between the actual voltage phase control amount and the normal voltage phase control amount is approximately 0. The fault determination flag is set to a low level (0). [0036] At time t1, for example, suppose that the U-phase winding 31 of MG30 is disconnected. Based on this, the current generation voltage becomes lower than the target generation voltage, and the amount of lag phase addition increases. The lag phase addition amount is added to the initial value of the voltage phase control amount, and the voltage phase control amount increases. As a result, the deviation between the actual voltage phase control amount and the normal voltage phase control amount increases. [0037] After that, at time t2, the deviation between the actual voltage phase control amount and the normal voltage phase control amount is greater than the fault determination threshold. Based on this, it is determined that the MG30 is abnormal. The failure determination flag is set to on. [0038] The embodiment described above has the following advantages. [0039] In the case of an MG30 failure, the phase controlled by the inverter 50 when performing power conversion will deviate from the normal phase. Therefore, the fault detection device 70 of the present embodiment is based on the deviation between the phase at the time of power conversion controlled by the control amount calculation unit 60 and the phase at the time of normal power conversion of the MG 30 that is associated and memorized in the memory 71 Can determine the failure of MG30. Further, the memory section 71 of the fault detection device 70 stores a phase that is controlled in accordance with the operating state of the engine 20 when power conversion is performed when the MG 30 is normal. Therefore, the fault detection device 70 can reflect the running state of the engine 20 to determine the fault of the MG30, and can detect the fault of the MG30 early and correctly. [0040] The failure detection device 70 of this embodiment includes a failure determination unit 72. When the amount of deviation between the phase at the time of power conversion controlled by the control amount calculation section 60 and the phase at the time of normal power conversion of the MG 30 memorized by the memory section 71 is greater than the failure determination threshold, the failure determination section 72 Determined that MG30 is faulty. Accordingly, the failure detection device 70 can easily detect a failure of the MG30. [0041] The power generation voltage generated by the MG30 varies according to the rotation speed Ne of the engine 20. Therefore, the phase for setting each phase of the inverter 50 to ON (conducting) during power conversion also changes in accordance with the rotation speed Ne of the engine 20. Here, the memory section 71 of the fault detection device 70 of this embodiment associates and memorizes the phase controlled during the normal power conversion of the MG 30 with the rotation speed Ne of the engine 20. Accordingly, the failure detection device 70 can accurately reflect the failure of the MG 30 by reflecting the rotation speed Ne of the engine 20. [0042] The target power generation voltage when the MG30 generates power varies according to the electrical load of the supplementary machine 80. Therefore, the phase at which each phase of the inverter 50 is set to be turned on during power conversion also changes in accordance with the electrical load of the supplementary machine 80. Here, the memory section 71 of the fault detection device 70 of this embodiment associates and memorizes the phase controlled during the normal power conversion of the MG 30 with the electrical load of the supplementary machine 80. According to this, the fault detection device 70 can reflect the electrical load of the supplementary machine 80 and correctly determine the fault of the MG 30. [0043] The first embodiment can be modified as follows. [0044] In a modified example of the first embodiment, when the speed of change in the amount of deviation between the phase controlled at the time of power conversion and the phase at the normal time of MG30 is greater than the failure determination threshold (when the speed of change is not normal, the In the case where the speed is high), the failure determination unit 72 may determine that the MG30 is malfunctioning. [0045] FIG. 6 is a flowchart showing a processing procedure of failure detection in a modification of the first embodiment. The failure determination unit 72 calculates the change speed of the deviation amount calculated by the same method as the processing of step S21 in FIG. 4 (step S31). The rate of change of the deviation amount can be calculated, for example, by subtracting the deviation amount calculated previously from the deviation amount calculated this time. Next, the failure determination unit 72 determines whether the rate of change of the deviation amount calculated in the process of step S31 is greater than the failure determination threshold value (step S32). The threshold value of failure judgment related to the change speed of the deviation amount (equivalent to the specified change speed) is set to the specified change speed that would not occur during normal MG30. When the failure determination unit 72 determines that the change speed of the deviation amount is greater than the failure determination threshold (step S32: YES), the process of step S33 is performed. On the other hand, the failure determination unit 72 determines that the speed of change in the amount of deviation is below the failure determination threshold (step S32: NO) and executes the processing of step S34. The processing in steps S33 and S34 is the same as the processing in steps S23 and S24 in FIG. 4, respectively. [0046] FIG. 7 is a timing chart showing an example of failure detection in a modification of the first embodiment. The operation up to time t1 is the same as that shown in FIG. 5. At time t3 before time t2, it is assumed that the rate of change of the deviation amount becomes greater than the failure determination threshold. Based on this, it was determined that MG30 was abnormal. The failure determination flag is set to on. According to the above configuration, in this modification, when the amount of deviation between the phase controlled at the time of power conversion and the phase at the normal time of the MG30 increases rapidly, the failure of the MG30 can be detected early. [0047] <Second Embodiment> Hereinafter, the second embodiment will be described focusing on the differences from the first embodiment. The same components as those in the first embodiment are assigned the same reference numerals as those in the first embodiment, and descriptions thereof are omitted. [0048] FIG. 8 shows a schematic block diagram of a system 110 according to this embodiment. [0049] The MG130 includes a first group of windings 31A, 32A, and 33A and a second group of windings 31B, 32B, and 33B. The windings of windings 31A, 32A, 33A (three-phase windings of the first group) are more than the windings of windings 31B, 32B, 33B (three-phase windings of the second group). The MG 130 can switch the group of three-phase windings (windings of each phase corresponding to U-phase, V-phase, and W) connected to the inverter 50 to the first group and the second group. Specifically, the MG 130 includes switching units 37, 38, and 39. The switching section 37 switches between the winding 31A and the winding 31B. The switching unit 38 switches between the winding 32A and the winding 32B. The switching unit 39 switches between the winding 33A and the winding 33B. The operations of the switching sections 37, 38, and 39 are controlled by a winding switching control section (hereinafter referred to as a “switching control section”) 65. [0050] The switching control unit 65 is similar to the control amount calculation unit 60 and the failure detection device 70, and is configured of, for example, an MGECU, an engine ECU, a hybrid ECU, and the like. MGECU controls MG130. The engine ECU controls the engine 20. Hybrid ECU is a higher-level ECU that controls MGECU and engine ECU. When the rotation speed Ne of the engine 20 is slower than a predetermined rotation speed, the switching control unit 65 operates the switching units 37, 38, and 39 to switch the three-phase windings connected to the inverter 50 to the windings 31A, 32A, and 33A. Specifically, when the rotation speed Ne of the engine 20 is slower than the predetermined rotation speed, the switching sections 37, 38, and 39 are switched from windings 31B, 32B, and 33B (second group) to windings 31A, 32A, and 33A (second team 1). When the rotation speed Ne of the engine 20 is faster than a predetermined rotation speed, the switching control unit 65 operates the switching units 37, 38, and 39 to switch the three-phase windings connected to the inverter 50 to the windings 31B, 32B, and 33B. Specifically, when the rotation speed Ne of the engine 20 is faster than a predetermined rotation speed, the switching sections 37, 38, and 39 are switched from windings 31A, 32A, and 33A (the first group) to windings 31B, 32B, and 33B (the first group), respectively. 2 teams). [0051] The memory section 71 performs voltage phases (normally controlled voltage phase control amounts) of the three-phase windings in accordance with the operating state of the engine 20 during power conversion of the MG130 through the inverter 50 during normal conversion. memory. Specifically, as shown in the example of FIG. 10, the memory section 71 is the electrical load in the state of the windings 31A, 32A, and 33A (three-phase windings in the first group) connected to the inverter 50 in the normal state of the MG130. The relationship between the size and the rotation speed Ne of the engine 20 and the voltage phase control amount of the inverter 50 are used as mapping data and memorized. As shown in the example of FIG. 11, the memory section 71 stores the magnitudes of the electrical loads in the state of the windings 31B, 32B, and 33B (second-phase three-phase windings) connected to the inverter MG130 in the normal state 50. The relationship between the speed of the rotation speed Ne of the engine 20 and the voltage phase control amount of the inverter 50 is used as mapping data and memorized. The memorized data is a value measured in the same manner as in the first embodiment when the MG130 is normal, for example, by performing a predetermined experiment. The mapping data associates the value of the electrical load with the value of the rotation speed Ne of the engine 20 and the value of the voltage phase control amount of the inverter 50 in association with each other. That is, the information indicating the operating state of the engine includes the electrical load of the supplementary machine 80 and the rotation speed Ne of the engine 20. [0052] In this embodiment, the failure determination unit 72 determines the voltage phase control amount at the normal time that is referred to when the failure detection processing illustrated in FIGS. 4 and 6 is executed as follows. The failure determination section 72 corresponds to a group of three-phase windings connected to the inverter 50, and determines reference data from among the data of the voltage phase control amount at the normal time stored in the storage section 71. FIG. 9 is a flowchart for determining a processing sequence of reference data in a normal state. This series of processing is repeatedly executed by the failure determination unit 72 at a predetermined cycle. [0053] The failure determination unit 72 of this embodiment determines whether or not the group of three-phase windings connected to the inverter 50 is before switching (step S41). Specifically, the failure determination unit 72 determines whether the group of three-phase windings is switched from the windings 31A, 32A, and 33A (the first group) to the windings 31B, 32B, and 33B (the second group) through the switching control unit 65. When the failure determination unit 72 determines that the group of three-phase windings is before switching (step S41: YES), the reference data of the group of three-phase windings is determined as the voltage phase control amount at the time of normal before switching (step S42). That is, if the determination of step S41 is affirmative, the failure determination unit 72 will memorize the state of the windings 31A, 32A, and 33A (the three-phase windings of the first group) connected to the inverter 50 when the MG130 is normal. The data (refer to FIG. 10) of the relationship between the magnitude of the electrical load in the engine, the speed Ne of the engine 20 and the voltage phase control amount of the inverter 50 (see FIG. 10) is determined as the reference data. After that, the failure determination unit 72 once ends (ends) this series of processing. [0054] On the other hand, in the determination processing of step S41, if the failure determination unit 72 determines that the group of three-phase windings is not before switching (step S41: No), the reference data of the group of three-phase windings is determined as The voltage phase control amount in the normal state after switching (step S43). That is, when the determination in step S41 is negative, the failure determination unit 72 will memorize the state of the windings 31B, 32B, and 33B (second-phase three-phase windings) connected to the inverter 50 when the MG130 is normal. The data (see FIG. 11) of the relationship between the magnitude of the electrical load and the rotation speed Ne of the engine 20 and the voltage phase control amount of the inverter 50 are determined as reference data. After that, the failure determination unit 72 once ends (ends) this series of processing. [0055] According to this embodiment, the MG130 includes a first group of windings 31A, 32A, and 33A and a second group of windings 31B, 32B, and 33B. The MG130 can switch the group of the three-phase windings connected to the inverter 50 through the switching sections 37, 38, and 39. The memory section 71 of the fault detection device 70 memorizes the phases that are controlled by the inverter 20 according to the operating state of the engine 20 when the inverter 50 performs power conversion according to each group of the three-phase windings when the MG 130 is normal. The fault determination section 72 of the fault detection device 70 corresponds to the group of three-phase windings connected to the inverter 50, and determines the fault detection processing time from the data of the voltage phase control amount at the normal time stored in the memory section 71. Reference data used. The failure determination unit 72 determines the failure of the MG130 based on the amount of deviation between the phase at the time of power conversion controlled by the control amount calculation unit 60 and the phase at the time of normal power conversion memorized by the storage unit 71 of the MG130. According to this, the failure detection device 70 can detect the failure of each of the three-phase windings included in the MG 130 early and correctly. [0056] In addition, the first and second embodiments can be implemented as modified as follows. [0057] In the modified examples of the first and second embodiments, the rotation speed Ne of the engine 20 may be calculated based on the detection value of the crank angle sensor that detects the crank angle of the engine 20. In addition, as information showing the operating state of the engine 20, instead of the rotation speed Ne of the engine 20, a value obtained by calculating the rotation speed Ne or a rotation speed of a cam shaft (not shown) provided in the engine 20 may be used instead. . [0058] In a modification of the first embodiment, the failure determination unit 72 adds the counter from the point when the determination in step S22 in FIG. 4 or step S32 in FIG. 6 is affirmative. The failure determination unit 72 determines that the MG 30 is abnormal under the condition that the counter value is greater than a predetermined counter value. That is, the failure determination unit 72 may determine that the MG 30 is abnormal based on the condition that the determination in step S22 in FIG. 4 or step S32 in FIG. 6 is positive within a predetermined time. In the second embodiment, the data of the voltage phase control amount at the normal time referred to when the fault detection processing illustrated in FIGS. 4 and 6 is executed is switched according to the group of the three-phase windings connected to the inverter 50. Here, in the modification of the second embodiment, the failure determination unit 72 may set a counter for each group of the three-phase windings. According to this configuration, even when the set of the three-phase windings connected to the inverter 50 is switched during the counting of the counter, the counter value can be held in the counter before the switching. The failure determination unit 72 may detect a disconnection or the like of each of the three-phase windings based on the counter value of the counter of each of the three-phase windings. [0059] In the first and second embodiments, an example of detecting a failure of the MG30 or MG130 when the MG30 or MG130 is performing power generation will be described. On the other hand, in this modification, if the power supplied by the DC power source 40 is used to boost the driving force of the engine 20 by MG30 or MG130, the failure of MG30 or MG130 may be detected. That is, when the MG30 or MG130 is driven (powered), the failure of the MG30 or MG130 may be detected. In this case, instead of the lead / lag phase control shown in FIG. 2, the control amount calculation unit 60 executes lead / lag phase control of the voltage phase control amount based on the target drive torque instead. Specifically, when the MG30 is driven, the control amount calculation unit 60 repeatedly sets each phase of the inverter 50 according to the rotation angle (electrical angle) of the rotor to be turned on during 180 ° and turned off during 180 °. Off. This type of control is called a rectangular wave voltage control. In addition, instead of the rectangular wave voltage control, the control amount calculation unit 60 may use a sine wave drive control, an overmodulation drive control, or a conduction period that is repeatedly turned on and off between 180 ° of the rotation angle (electrical angle) of the rotor. (on-period) 120 degree energization control of 120 °. When the target driving torque is larger than the current MG30 driving torque, the control amount calculation unit 60 sets the voltage phase control amount to a leading phase. When the target drive torque is smaller than the current MG30 drive torque, the control amount calculation unit 60 sets the voltage phase control amount to a lag phase. In this modification, the relationship obtained by replacing the power supply voltage with the electrical load of FIG. 3 and replacing the advanced phase amount with a lag phase amount is measured in advance, and the measurement results are memorized. The control amount calculation unit 60 may perform the failure detection processing of at least one of FIG. 4 and FIG. 6 using the measurement result. [0060] The torque T of the motor can be calculated from the calculation formula of T = p ･ Φ ･ iq. p is the number of magnetic pole pairs, Φ is the induced voltage constant, and iq is the q-axis current. p and Φ are fixed values. Therefore, the torque T can be simply calculated using iq. iq can be obtained by referring to mapping data set in advance based on a voltage phase control amount, a power supply voltage, and a motor rotation speed. [0061] The lead / lag phase control of the voltage phase control amount in this modification will be specifically described using the flowchart of FIG. 12. The control amount calculation unit 60 of this modification sets an initial value for the voltage phase control amount (step S51). The initial value is an amount of voltage phase control (normal value at idle) of the engine 20 at idle when the MG30 or MG130 is normal. [0062] Next, the control amount calculation unit 60 determines whether the target torque is greater than the current torque (step S52). When the control amount calculation unit 60 determines that the target torque is greater than the current torque (step S52: YES), it calculates the advanced phase addition amount (step S53). The advanced phase addition amount is an amount that advances the phase of the applied voltages Vu, Vv, and Vw to the phase of the signal of the magnetic pole position sensor. In this modification, the relationship between the difference ΔT (ΔT = target torque-current torque) between the target torque and the current torque and the leading phase addition amount is set in advance in a table. That is, in this embodiment, the mapping data in which the correspondence relationship between the difference ΔT and the advanced phase addition amount is set is stored in advance in a memory device provided in the control amount calculation unit 60. Therefore, the control amount calculation unit 60 refers to the table and calculates the advanced phase addition amount based on the difference ΔT. The table may be set in accordance with the rotation speed Ne of the engine 20. [0063] Next, the control amount calculation unit 60 adds the leading phase addition amount to the voltage phase control amount set in the process of step S51, and calculates the voltage phase control amount (step S54). The control amount calculation unit 60 once ends (ends) this series of processing. [0064] On the other hand, when the control amount calculation unit 60 determines that the target torque is lower than the current torque (step S52: No), it calculates the lag phase addition amount (step S55). The lag phase addition amount is an amount that lags the phases of the applied voltages Vu, Vv, and Vw to the phases of the magnetic pole position sensor signals. In this modification, the relationship between the difference ΔT between the target torque and the current torque and the lag phase addition amount is stored in advance in a table. The control amount calculation unit 60 refers to this table and calculates the lag phase addition amount based on the difference ΔT. The table may be set in accordance with the rotation speed Ne of the engine 20. [0065] Next, the control amount calculation unit 60 calculates the voltage phase control amount by subtracting the lag phase addition amount from the voltage phase control amount set in the process of step S51 (step S56). The control amount calculation unit 60 once ends (ends) this series of processing. [0066] As described above, in this modification, a case where the MG30 or MG130 performs driving (power operation) is assumed. In this case, the power supply voltage is low, and the faster the rotation speed Ne of the engine 20 is, the more the voltage phase control amount of the inverter 50 is advanced. [0067] As in the case where the MG30 or MG130 performs power generation, in this modification, the fault determination unit 72 of the fault detection device 70 detects a fault of the MG30 or MG130 according to the processing sequence illustrated in the flowchart of FIG. [0068] For example, suppose that the U-phase winding 31 of MG30 is disconnected. As a result, the current torque becomes smaller than the target torque, and the lead phase addition amount increases. Here, the leading phase addition amount is added to the initial value of the voltage phase control amount, and the voltage phase control amount increases. As a result, the amount of deviation between the actual voltage phase control amount and the normal voltage phase control amount appears to increase. After that, the deviation between the actual voltage phase control amount and the normal voltage phase control amount becomes larger than the failure determination threshold. Based on this, it was determined that MG30 was abnormal. The fault determination flag is set to a high level (1). [0069] When a three-phase rotating electric machine detects a failure of the three-phase rotating electric machine while generating power, an MG or an alternator may be used as the three-phase rotating electric machine. In addition, when a failure of the three-phase rotary electric machine is detected when the three-phase rotary electric machine is driven (powered), the three-phase rotary electric machine may be an MG or a motor. [0070] Above, the embodiments of the technology of the present disclosure have been described, but the technology of the present disclosure is not limited to the above embodiments. The technology of the present disclosure is applicable to various embodiments without departing from the gist of the present disclosure. [0071] For example, as another embodiment [1], when the amount of deviation between the current voltage phase control amount and the normal voltage phase control amount is larger than the failure determination threshold (predetermined amount), the failure determination section 72 Make a temporary judgment on the fault judgment of MG30 and keep it for a while. Next, when the change rate of the deviation between the phase controlled at the time of power conversion and the phase when the MG30 is normal becomes greater than the failure determination threshold (predetermined speed), the failure determination unit 72 may determine that the MG30 is a true failure. . [0072] The memory section 71 stores the voltage phase controlled by the inverter 50 according to the operating state of the engine 20 during normal power conversion of the MG 30 and the speed of change of the voltage phase. [0073] In another embodiment [1], the above-mentioned fault determination threshold is determined according to the voltage phase and the change rate of the voltage phase stored in the memory section 71. The above determination is performed in accordance with the processing sequence of the flowcharts illustrated in FIGS. 4 and 6. [0074] Also, as another embodiment [2], the failure determination unit 72 may reverse the execution order of the temporary determination and the true determination of the other embodiment [1]. That is, when the variation rate of the deviation amount is larger than the failure determination threshold, the failure determination section 72 sets the failure determination of the MG30 as a temporary determination and reserves it for a time. When the amount of deviation between the current voltage phase control amount and the normal voltage phase control amount is greater than the failure determination threshold, the failure determination section 72 may determine that the failure of the MG30 is a true failure. [0075] In another embodiment [2], when the variation speed of the deviation amount becomes large and is momentarily larger than the failure determination threshold, the failure determination unit 72 does not immediately determine that MG30 is abnormal. When the amount of deviation between the current voltage phase control amount and the normal voltage phase control amount becomes larger than the failure determination threshold, the failure determination section 72 determines that the failure of the MG30 is a true failure. Therefore, in the other embodiment [2], it is possible to perform more accurate fault determination. [0076] According to this, in the other embodiment [2], it is possible to suppress the transmission of unintentional abnormalities to passengers, and it is possible to correctly detect the failure of the rotating electrical machine.

[0077]

10, 110‧‧‧ system

20‧‧‧ Engine

30, 130‧‧‧MG

40‧‧‧DC Power

50‧‧‧ Inverter

60‧‧‧Voltage phase control amount calculation section (phase control section)

70‧‧‧Fault detection device

71‧‧‧Memory Department

72‧‧‧Fault determination department

[0011] [FIG. 1] A block diagram schematically showing a system of the first embodiment.图 [Figure 2] Flow chart of processing sequence of lead / lag phase control. [Fig. 3] Map data showing the relationship between the engine rotation speed and the electrical load and the voltage phase control amount in the normal state. [Fig. 4] A flowchart showing a processing procedure of failure detection in the first embodiment.图 [Fig. 5] A timing chart showing an example of fault detection. [Fig. 6] A flowchart showing a processing procedure of a modified example of failure detection. [Fig. 7] A timing chart showing another example of failure detection. [Fig. 8] A schematic block diagram showing a system of the second embodiment.图 [Fig. 9] A flowchart showing a processing procedure of reference data determination in a normal state.图 [Fig. 10] A map showing the relationship between the engine rotation speed, the electrical load, and the voltage phase control amount when the three-phase windings in the first group are connected normally.图 [Fig. 11] shows the mapping of the relationship between the engine rotation speed and the electrical load and the voltage phase control amount when the three-phase windings in the second group are connected normally. [Fig. 12] A flowchart of a processing sequence of a modification of the lead / lag phase control.

Claims (7)

A fault detection device for a rotating electrical machine is a fault detection device (70) for a rotating electrical machine suitable for a system (10, 110). The system (10, 110) includes: an engine (20); a rotating electrical machine (30, 130), Connected to the engine to transmit power; a DC power supply (40); an inverter (50) to perform power conversion between the rotating electric machine and the DC power supply; and a phase control unit (60) according to the operating state of the engine Controlling the phases of turning on / off the phases of the inverter during the power conversion; the fault detection device is provided with a memory section (71), which remembers that when the rotating electrical machine is normal, the power conversion is based on the engine The phase controlled by the operating state; the failure determination unit (72), based on the phase during the power conversion controlled by the phase control unit, and the power conversion during the normal period of the rotating electrical machine memorized by the memory unit The amount of deviation between the phases at the time determines the failure of the rotating electric machine; the phase is the phase of the voltage applied to each phase of the inverter; the above Memory unit, the phase of the line voltage is applied during the normal operation state of the engine and the rotary electric machine corresponding to the given association and memory. For example, the fault detection device for a rotating electric machine according to the first patent application range, wherein the above-mentioned failure determination unit determines the failure of the rotating electric machine when the deviation amount is greater than a predetermined amount. For example, the fault detection device for a rotating electric machine according to item 1 or 2 of the patent application, wherein the failure determining unit determines the failure of the rotating electric machine when a change rate of the deviation amount is faster than a predetermined change rate. For example, the fault detection device for a rotating electrical machine in the scope of patent application No. 1 or 2, in which the above-mentioned rotating electrical machine (130) is a group with a three-phase winding of a complex array (31A, 32A, 33A: 31B, 32B, 33B). The group of the three-phase windings connected to the inverter is switched, and the memory unit is controlled according to the operating state of the engine when the power of the rotating electrical machine is stored in each group of the three-phase windings as normal The phase of the above-mentioned fault determination unit is in the group of the three-phase windings connected to the inverter, based on the phase at the time of the power conversion controlled by the phase control unit, and the phase memorized by the memory unit. The amount of deviation between the phases during the power conversion is used to determine the failure of the rotating electric machine. For example, the fault detection device for a rotating electrical machine in the scope of patent application No. 1 or 2, wherein the operating state of the engine includes the rotation speed of the engine. For example, the fault detection device for a rotating electric machine in the scope of patent application No. 1 or 2, wherein the rotating electric machine can perform power generation by the power transmitted by the engine, and the system has more than one supplementary machine (80), and the operation of the engine The state is the electrical load including the above-mentioned supplementary machine. A fault detection device for a rotating electrical machine is a failure detection device suitable for a rotating electrical machine of a system. The system includes: an engine; a rotating electrical machine connected to the engine to transmit power; a DC power source; and an inverter. Power conversion is performed between the DC power sources; and a phase control unit controls a phase of each phase of the inverter to be turned on / off during the power conversion according to an operating state of the engine; the fault detection device includes a memory unit, When the rotating electric machine is normal, the phase controlled by the engine operating state during the power conversion is memorized; and the fault determination unit is based on the phase during the power conversion controlled by the phase control unit, and the phase The amount of deviation between the phases of the rotating electrical machine in the normal state and the power conversion, which is memorized by the memory unit, determines the failure of the rotating electrical machine; the rotating electrical machine is provided with a complex three-phase winding group, and The group of the three-phase windings connected to the inverter is switched, The memory unit is configured to memorize each phase of the three-phase winding according to the phases of the rotating electrical machine which are controlled during the power conversion according to the operating state of the engine, and the fault determination unit is connected to the inverter. The connected three-phase winding group is determined based on the amount of deviation between the phase at the time of power conversion controlled by the phase control section and the phase at the time of power conversion memorized by the memory section. Failure of the above rotating electric machine.