WO2018030217A1

WO2018030217A1 - Failure detection device of rotating electrical machine

Info

Publication number: WO2018030217A1
Application number: PCT/JP2017/027886
Authority: WO
Inventors: 康宏不破; 永田　孝一; 俊和地高
Original assignee: 株式会社デンソー
Priority date: 2016-08-12
Filing date: 2017-08-01
Publication date: 2018-02-15
Also published as: CN109562756B; JP2018024377A; CN109562756A; TWI656352B; JP6750386B2; TW201821820A

Abstract

A failure detection device (70) is utilized in a system (10, 110) which comprises: a rotating electrical machine (30, 130) that is connected to an engine (20) such that motive power can be transmitted; an inverter (50) that performs power conversion between the rotating electrical machine and a direct current power source (40); and a phase control unit (60) that controls, on the basis of the operation state of the engine, a phase that turns on/off each phase of the inverter during power conversion. The failure detection device includes a storage unit (71) and a failure determination unit (72). The storage unit stores a phase to be controlled on the basis of the operation state of the engine during power conversion when the rotating electrical machine is operating normally. The failure determination unit determines a failure in the rotating electrical machine on the basis of a deviation amount between the phase during power conversion that is controlled by the phase control unit and the phase during power conversion during normal operation of the rotating electrical machine that is stored in the storage unit.

Description

Rotating electrical machine failure detection device

This disclosure relates to a technique for detecting a failure in a rotating electrical machine.

For example, Patent Document 1 discloses the following failure detection. When the output torque of the AC motor is smaller than the torque command value, the voltage phase of the rectangular wave voltage is increased within a range equal to or less than a predetermined upper limit phase. Then, when the voltage phase continuously matches the upper limit phase for a predetermined time, an abnormality of the inverter is detected. In the technique described in Patent Document 1, the upper limit phase is set to a constant value in advance. This is because in an AC motor, the voltage phase at which the output torque is maximum is a constant value.

JP 2010-119268 A

However, in the technique described in Patent Document 1, an inverter abnormality cannot be detected unless the voltage phase matches the upper limit phase and the state continues for a predetermined time. In other words, conventionally, a predetermined time is required to detect an abnormality of the inverter. For this reason, the abnormality of the inverter cannot be detected at an early stage, and there is still room for improvement.

This disclosure provides a failure detection technique for a rotating electrical machine that can detect a failure early and accurately.

The failure detection apparatus which is an aspect of the technology of the present disclosure has the following configuration.

The failure detection device (70) of the present disclosure is applied to a system including an engine (20), a rotating electrical machine (30, 130), a DC power supply (40), an inverter (50), and a phase control unit (60).
The rotating electrical machine is connected to the engine so that power can be transmitted.
The inverter converts power between the rotating electrical machine and the DC power source.
The phase control unit controls the phase at which each phase of the inverter is turned on / off during power conversion based on the operating state of the engine.
The failure detection apparatus includes a storage unit (71) and a failure determination unit (72). The storage unit stores a phase controlled based on the operating state of the engine during power conversion when the rotating electrical machine is normal.
The failure determination unit, based on the amount of divergence between the phase at the time of power conversion controlled by the phase control unit and the phase at the time of power conversion when the rotating electrical machine is normal stored in the storage unit, Determine failure.

According to the above configuration, in the system according to the present disclosure, the engine and the rotating electrical machine are coupled so that power can be transmitted. For this reason, for example, it is possible to cause the rotating electrical machine to generate electric power with the driving force of the engine, or to assist the driving force of the engine with the driving force of the rotating electrical machine. In addition, power is converted between the rotating electrical machine and the DC power source by the inverter. In the system according to the present disclosure, the phase that controls each phase of the inverter during power conversion is controlled by the phase control unit based on the operating state of the engine.

At this time, if the rotating electrical machine is out of order, the phase controlled during power conversion by the inverter deviates from the normal phase. For this reason, the failure detection device of the present disclosure is based on the amount of deviation between the phase at the time of power conversion controlled by the phase control unit and the phase at the time of power conversion when the rotating electrical machine is normal stored in the storage unit. Based on this, it is possible to determine the failure of the rotating electrical machine. Furthermore, the storage unit stores a phase controlled based on the operating state of the engine during power conversion when the rotating electrical machine is normal. For this reason, the failure detection device according to the present disclosure can determine the failure of the rotating electrical machine by reflecting the operating state of the engine, and can detect the failure of the rotating electrical machine early and accurately.

Note that the phase at which each phase of the inverter is turned on / off includes a correction amount (control amount) for correcting the phase. The rotating electrical machine only needs to perform at least one of power generation and driving.

It is a block diagram which shows the outline of the system of 1st Embodiment. It is a flowchart which shows the process sequence of advance / retard angle control. It is map data which shows the relationship between the engine speed at the time of normal, an electric load, and a voltage phase control amount. It is a flowchart which shows the process sequence of the failure detection of 1st Embodiment. It is a time chart which shows an example of failure detection. It is a flowchart which shows the process sequence of the modification of a failure detection. It is a time chart which shows the other example of failure detection. It is a block diagram which shows the outline of the system of 2nd Embodiment. It is a flowchart which shows the process sequence of the reference data determination at the time of normal. It is a map which shows the relationship between the engine speed at the time of normal at the time of a 1st set of three-phase winding connection, an electrical load, and a voltage phase control amount. It is a map which shows the relationship between the engine speed at the time of normal at the time of the 2nd set of three-phase winding connection, an electric load, and a voltage phase control amount. It is a flowchart which shows the process sequence of the modification of advance / retard angle control.

Hereinafter, modes for carrying out the technology of the present disclosure will be described in detail with reference to the drawings.
<First Embodiment>
In the present embodiment, an example in which the technology of the present disclosure is applied to a system such as a motorcycle (vehicle) will be described.

As illustrated in FIG. 1, the system 10 includes an engine 20, an MG (Motor Generator) 30, a DC power supply 40, an inverter 50, a voltage phase control amount calculation unit (hereinafter referred to as “control amount calculation unit”) 60, a failure detection device. 70, one or a plurality of auxiliary machines 80 and the like.

Engine 20 generates power by burning fuel. As the engine 20, for example, a gasoline engine, a diesel engine, or another engine can be adopted.

MG30 is a generator with a starter function. The MG 30 of this embodiment corresponds to a three-phase rotating electrical machine. Therefore, MG30 of this embodiment is provided with the function of a three-phase alternating current motor and a three-phase alternating current 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 each phase winding 31, 32, 33 is commonly connected to the neutral point. The rotor of MG30 includes a magnet. The rotor is directly connected to the crankshaft of the engine 20. That is, engine 20 and MG 30 are coupled so as to be able to transmit power. An angular position sensor 36 for detecting the angular position of the rotor is attached to the MG 30.

The DC power supply 40 is a secondary battery or a capacitor made of a Pb battery, a Li ion battery, a NiH battery, or the like. The voltage Vdc of the DC power supply 40 is detected by a voltage sensor (not shown). During power generation of MG30, the voltage sensor detects the power generation voltage of MG30.

An inverter 50 is connected between the MG 30 and the DC power supply 40. The inverter 50 of the present 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 the positive electrode and the negative electrode of DC power supply 40. Diodes are connected in antiparallel to the switching elements. The on / off of the switching element is controlled by applied voltages Vu, Vv, and Vw (applied voltage command values) from the control amount calculation unit 60. The applied voltages Vu, Vv, and Vw are obtained based on the voltage phase control amount calculated by the control amount calculation unit 60. Each phase arm is connected to the other end of each phase winding 31, 32, 33.

The DC power supply 40 and the inverter 50 are connected to one or more auxiliary machines 80. The auxiliary machine 80 includes, for example, a headlight, a dimmer switch, a blinker, a brake lamp, a horn (horn). The dimmer switch is a switch for switching the optical axis of the headlight downward (to switch between a high beam and a low beam).

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. As the ECU, for example, an MGECU, an engine ECU, a hybrid ECU, or the like can be adopted. The MGECU controls the MG30. The engine ECU controls the engine 20. The hybrid ECU is a host ECU that controls the MGECU and the engine ECU.

Rotational speed Ne of the crankshaft directly connected to the MG 30 rotor is input to the control amount calculation unit 60. The angular velocity ω can be calculated by differentiating the angular position θ of the rotor of the MG 30 with respect to time. This angular speed ω corresponds to the rotational speed Ne of the crankshaft directly connected to the rotor of the MG 30 (the rotational speed of the engine 20) Ne. In addition, the control amount calculation unit 60 receives the voltage Vdc detected by the voltage sensor.

The control amount calculation unit 60 of the present embodiment corresponds to a phase control unit that controls the phase at which each phase of the inverter 50 is turned on / off during power conversion based on the operating state of the engine 20. The control amount calculation unit 60 calculates the voltage phase control amount according to the processing procedure illustrated in the flowchart of FIG. 2 (executes advance / retard angle control of the voltage phase control amount). This series of processing is repeatedly executed by the control amount calculation unit 60 at a predetermined cycle. In the present embodiment, a case where the MG 30 performs power generation will be described as an example. Specifically, when the MG 30 performs power generation, the control amount calculation unit 60 turns on each phase of the inverter 50 for a period of 180 ° with the rotation angle (electrical angle) of the rotor, and turns it off for a period of 180 °. Repeat to do.

The control amount calculation unit 60 of the present embodiment sets an initial value for the voltage phase control amount (step S11). The voltage phase control amount is the advance / retard amount of the applied voltages Vu, Vv, and Vw with respect to the magnetic pole position sensor signal. The initial value is a voltage phase control amount when the engine 20 is idling when the MG 30 is normal. That is, the initial value is a normal value during idling.

Subsequently, the control amount calculation unit 60 determines whether or not the target power generation voltage is higher than the current power generation voltage (step S12). The target generated voltage is set based on the operating state of one or more auxiliary machines 80 (electric load of auxiliary machine 80). For example, the greater the number of operating auxiliary machines 80, the greater the electrical load. Therefore, the target power generation voltage is set high. The generated voltage is detected by the voltage sensor described above.

When it is determined that the target power generation voltage is higher than the current power generation voltage (step S12: YES), the control amount calculation unit 60 calculates the retard addition amount (step S13). The retardation addition amount is an amount that retards the phase of the applied voltages Vu, Vv, and Vw with respect to the magnetic pole position sensor signal. In the present embodiment, the amount of power generation can be increased by retarding switching. In this 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 amount of delay addition is set in a table in advance. That is, in the present embodiment, map data in which the correspondence relationship between the difference ΔV and the retard addition amount is set is stored in advance in a storage device included in the control amount calculation unit 60. Therefore, the control amount calculation unit 60 refers to this table and calculates the retard addition amount based on the difference ΔV. This table may be set according to the rotational speed Ne of the engine 20.

Subsequently, the control amount calculation unit 60 calculates the voltage phase control amount by adding the retardation addition amount to the voltage phase control amount set in the process of step S11 (step S14). Then, the control amount calculation unit 60 once ends this series of processing (END).

On the other hand, when it is determined that the target power generation voltage is equal to or lower than the current power generation voltage (step S12: NO), the control amount calculation unit 60 calculates the advance angle addition amount (step S15). The advance angle addition amount is an amount by which the phase of the applied voltage Vu, Vv, Vw is advanced with respect to the magnetic pole position sensor signal. In the present embodiment, the amount of power generation can be reduced by advancing the switching. In this embodiment, the relationship between the difference ΔV between the target power generation voltage and the current power generation voltage and the advance angle addition amount is set in the table in advance. The control amount calculation unit 60 refers to this table and calculates the advance addition amount based on the difference ΔV. This table may be set according to the rotational speed Ne of the engine 20.

Subsequently, the control amount calculation unit 60 calculates the voltage phase control amount by subtracting the advance angle addition amount from the voltage phase control amount set in the process of step S11 (step S16). Then, the control amount calculation unit 60 once ends this series of processing (END).

The failure detection device 70 includes a storage unit 71 and a failure determination unit 72. The storage unit 71 is a nonvolatile memory. The storage unit 71 includes a ROM, a rewritable nonvolatile memory, a backup RAM, and the like. Storage unit 71 stores a voltage phase (normal voltage phase control amount) controlled based on the operating state of engine 20 during power conversion by inverter 50 when MG 30 is normal. Specifically, as illustrated in FIG. 3, the storage unit 71 stores the magnitude of the electrical load, the speed of the rotational speed Ne of the engine 20, the voltage phase control amount of the inverter 50, when the MG 30 is normal. Is stored as map data. The stored data is a value measured by, for example, performing a predetermined experiment when the MG 30 is normal. In the map data, the value of the electric load, the value of the rotational speed Ne of the engine 20, and the value of the voltage phase control amount of the inverter 50 are associated with each other. That is, the information indicating the operating state of the engine 20 includes the electric load of the auxiliary machine 80 and the rotational speed Ne of the engine 20. Further, the storage unit 71 stores, as data, a failure determination threshold value (reference value for determining failure) with respect to a deviation amount of the voltage phase control amount and / or a change rate of the deviation amount of the voltage phase control amount, which will be described later. is doing.

The relationship illustrated in FIG. 3 assumes a case where the MG 30 performs power generation. For example, the voltage phase control amount of the inverter 50 is retarded as the electrical load is large and the rotational speed Ne of the engine 20 is slow. The voltage phase control amount (voltage phase) only needs to be stored for at least one of the U phase, the V phase, and the W phase.

The failure determination unit 72 detects a failure of the MG 30 according to the procedure illustrated in the flowchart of FIG. This series of processing is repeatedly executed at a predetermined cycle by the failure determination unit 72 during power generation by the MG 30. In the present embodiment, a case where the MG 30 performs power generation will be described as an example.

The failure determination unit 72 according to the present embodiment includes a current voltage phase control amount (actual control amount) and a normal voltage phase control amount corresponding to the operation state of the engine 20 at that time (normal data in the storage unit 71). ) Is calculated (step S21). The normal voltage phase control amount can be obtained by referring to the map data of FIG. 3 stored in the storage unit 71 and reading out the voltage phase control amount corresponding to the current operating state of the engine 20. The current voltage phase control amount can be acquired by inputting the voltage phase control amount used for controlling the inverter 50 from the control amount calculation unit 60 in the current operating state of the engine 20. Then, failure determination unit 72 subtracts the normal voltage phase control amount from the current voltage phase control amount. As a result, the failure determination unit 72 calculates a deviation amount (deviation amount = current voltage phase control amount−normal voltage phase control amount).

Subsequently, the failure determination unit 72 determines whether or not the deviation amount calculated in the process of step S21 is larger than the failure determination threshold (step S22). The failure determination threshold value (corresponding to a predetermined amount) is set to a predetermined deviation amount that cannot occur when the MG 30 is normal. If the failure determination unit 72 determines that the deviation amount is larger than the failure determination threshold (step S22: YES), the failure determination unit 72 determines that the MG 30 is abnormal (step S23). That is, failure determination unit 72 determines that MG 30 has failed. Specifically, the process of step S23 sets the failure determination flag to ON. In addition, as a failure of MG30, the disconnection of one of the

windings

31, 32, and 33 of each phase, a short circuit, etc. can be considered. Then, the failure determination unit 72 once ends this series of processes (END).

On the other hand, when determining that the divergence amount is equal to or less than the failure determination threshold in the determination process of step S22 (step S22: NO), failure determination unit 72 does not determine that MG30 is abnormal (step S24). That is, failure determination unit 72 determines that MG 30 has not failed. Specifically, the process of step S24 sets the failure determination flag to OFF. In this case, the failure determination unit 72 may determine that the MG 30 is likely to be abnormal, or tentatively determine that the MG 30 is abnormal, depending on the amount of deviation. Then, the failure determination unit 72 once ends this series of processes (END).

FIG. 5 is a time chart showing an example of failure detection according to the present embodiment.

Prior to time t1, the voltage phase control amount at that time (actual voltage phase control amount) is calculated based on the electric load of the auxiliary machine 80. At this timing, the actual voltage phase control amount matches the normal voltage phase control amount (normal data). For this reason, the amount of deviation between the actual voltage phase control amount and the normal voltage phase control amount is substantially zero. Then, the failure determination flag is set to off.

It is assumed that, for example, a disconnection occurs in the U-phase winding 31 of the MG 30 at time t1. As a result, the current power generation voltage becomes lower than the target power generation voltage, and the retard addition amount is increased. Then, the retardation 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 increases.

Thereafter, it is assumed that the deviation amount between the actual voltage phase control amount and the normal voltage phase control amount becomes larger than the failure determination threshold at time t2. Thereby, it is determined that MG30 is abnormal. Then, the failure determination flag is set to ON.

The embodiment described above has the following advantages.

When the MG 30 is out of order, the phase controlled during power conversion by the inverter 50 deviates from the normal phase. For this reason, the failure detection device 70 according to the present embodiment has the phase during power conversion controlled by the control amount calculation unit 60 and the power conversion time during normal operation of the MG 30 stored in association with the storage unit 71. A failure of the MG 30 can be determined based on the amount of deviation from the phase. Further, the storage unit 71 of the failure detection device 70 stores a phase that is controlled based on the operating state of the engine 20 during power conversion when the MG 30 is normal. For this reason, the failure detection device 70 can determine the failure of the MG 30 reflecting the operating state of the engine 20, and can detect the failure of the MG 30 early and accurately.

The failure detection device 70 of this embodiment has a failure determination unit 72. The failure determination unit 72 determines that the difference between the phase during power conversion controlled by the control amount calculation unit 60 and the phase during power conversion when the MG 30 stored in the storage unit 71 is normal is a failure determination. When it is larger than the threshold, it is determined that the MG 30 has failed. Thereby, failure detection device 70 can easily detect a failure of MG 30.

The power generation voltage generated by the MG 30 changes according to the rotational speed Ne of the engine 20. For this reason, the phase at which each phase of the inverter 50 is turned on during power conversion also changes according to the rotational speed Ne of the engine 20. Therefore, the storage unit 71 of the failure detection device 70 of the present embodiment stores the phase controlled during power conversion in association with the rotational speed Ne of the engine 20 when the MG 30 is normal. Thereby, failure detection device 70 can accurately determine the failure of MG 30 by reflecting the rotational speed Ne of engine 20.

The target generated voltage when the MG 30 generates power changes according to the electric load of the auxiliary machine 80. For this reason, the phase at which each phase of the inverter 50 is turned on during power conversion also changes in accordance with the electrical load of the auxiliary machine 80. Therefore, the storage unit 71 of the failure detection device 70 of the present embodiment stores the phase controlled during power conversion in association with the electric load of the auxiliary machine 80 when the MG 30 is normal. As a result, failure detection device 70 can accurately determine the failure of MG 30 by reflecting the electrical load of auxiliary device 80.

Note that the first embodiment may be modified as follows.

In the modification of the first embodiment, the failure determination unit 72 is configured when the rate of change in the amount of deviation between the phase controlled during power conversion and the phase during normal operation of the MG 30 is greater than the failure determination threshold ( It may be determined that the MG 30 has failed (when the rate of change is faster than a rate that cannot occur when normal).

FIG. 6 is a flowchart showing a processing procedure of failure detection in the modification of the first embodiment. The failure determination unit 72 calculates the change rate of the divergence amount calculated by the same method as the process of step S21 of FIG. 4 (step S31). The change rate of the divergence amount can be calculated, for example, by subtracting the previously calculated divergence amount from the divergence amount calculated this time. Subsequently, the failure determination unit 72 determines whether or not the change rate of the divergence amount calculated in the process of step S31 is larger than the failure determination threshold (step S32). A failure determination threshold value (corresponding to a predetermined change rate) relating to the change rate of the deviation amount is set to a predetermined change rate that cannot occur when the MG 30 is normal. If the failure determination unit 72 determines that the change rate of the divergence amount is greater than the failure determination threshold (step S32: YES), the failure determination unit 72 executes the process of step S33. On the other hand, when the failure determination unit 72 determines that the change rate of the divergence amount is equal to or less than the failure determination threshold (step S32: NO), the failure determination unit 72 performs the process of step S34. The processes in steps S33 and S34 are the same as the processes in steps S23 and S24 in FIG. 4, respectively.

FIG. 7 is a time chart showing an example of failure detection in the modification of the first embodiment. The operation up to time t1 is the same as in FIG. Assume that the change rate of the divergence amount becomes larger than the failure determination threshold at time t3 before time t2. Thereby, it is determined that MG30 is abnormal. Then, the failure determination flag is set to ON. According to the above configuration, in this modification, when the amount of divergence between the phase controlled during power conversion and the phase when MG 30 is normal increases rapidly, a failure of MG 30 can be detected early.

Second Embodiment
Hereinafter, the second embodiment will be described focusing on differences from the first embodiment. About the same member as 1st Embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol as 1st Embodiment.

FIG. 8 is a block diagram showing an outline of the system 110 of the present embodiment.

The MG 130 includes a first set of

windings

31A, 32A, and 33A and a second set of

windings

31B, 32B, and 33B. The number of turns of the

windings

31A, 32A, and 33A (first set of three-phase windings) is larger than the number of turns of the

windings

31B, 32B, and 33B (second set of three-phase windings). The MG 130 can switch the set of three-phase windings (windings of respective phases corresponding to the U-phase, V-phase, and W-phase) connected to the inverter 50 between the first set and the second set. Yes. Specifically, the MG 130 includes switching

units

37, 38, and 39. The switching unit 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

units

37, 38, 39 are controlled by a winding switching control unit (hereinafter referred to as “switching control unit”) 65.

The switching control unit 65 includes, for example, an MGECU, an engine ECU, a hybrid ECU, and the like, similar to the control amount calculation unit 60 and the failure detection device 70. The MGECU controls the MG 130. The engine ECU controls the engine 20. The hybrid ECU is a host ECU that controls the MGECU and the engine ECU. When the rotational speed Ne of the engine 20 is slower than the predetermined rotational speed, the switching control unit 65 operates the switching

units

37, 38, and 39 to connect the three-phase windings connected to the inverter 50 to the

windings

31A and 32A. , 33A. Specifically, when the rotational speed Ne of the engine 20 is lower than a predetermined rotational speed, the switching

units

37, 38, 39 are respectively switched from the

windings

31B, 32B, 33B (second set) to the

windings

31A, 32A, 33A (second set). Switch to the first set). When the rotational speed Ne of the engine 20 is higher than the predetermined rotational speed, the switching control unit 65 operates the switching

units

windings

31B and 32B. , 33B. Specifically, when the rotational speed Ne of the engine 20 is higher than a predetermined rotational speed, the switching

units

37, 38, 39 are respectively switched from the

windings

31 A, 32 A, 33 A (first set) to the

windings

31 B, 32 B, 33 B (first set). Switch to the second set).

Storage unit 71 stores, for each set of three-phase windings, a voltage phase (normal voltage phase control amount) controlled based on the operating state of engine 20 during power conversion by inverter 50 when MG 130 is normal. is doing. Specifically, as illustrated in FIG. 10, in the storage unit 71, the windings 31 </ b> A, 32 </ b> A, and 33 </ b> A (first set of three-phase windings) are connected to the inverter 50 when the MG 130 is normal. The relationship among the magnitude of the electric load, the speed of the rotational speed Ne of the engine 20, and the voltage phase control amount of the inverter 50 is stored as map data. In addition, as illustrated in FIG. 11, the storage unit 71 includes the electric power in a state where the

windings

31B, 32B, and 33B (second set of three-phase windings) are connected to the inverter 50 when the MG 130 is normal. The relationship between the magnitude of the load, the rotational speed Ne of the engine 20 and the voltage phase control amount of the inverter 50 is stored as map data. The stored data is, for example, a value measured by performing a predetermined experiment or the like when the MG 130 is normal, as in the first embodiment. In the map data, the value of the electric load, the value of the rotational speed Ne of the engine 20, and the value of the voltage phase control amount of the inverter 50 are associated with each other. That is, the information indicating the engine operating state includes the electric load of the auxiliary machine 80 and the rotational speed Ne of the engine 20.

In the present embodiment, the failure determination unit 72 determines the voltage phase control amount at the normal time to be referred to when executing the failure detection processing illustrated in FIGS. The failure determination unit 72 determines reference data from the normal voltage phase control amount data stored in the storage unit 71 according to the set of three-phase windings connected to the inverter 50. FIG. 9 is a flowchart illustrating a processing procedure for determining reference data in a normal state. This series of processing is repeatedly executed by the failure determination unit 72 at a predetermined cycle.

The failure determination unit 72 of the present embodiment determines whether or not it is before switching the set of three-phase windings connected to the inverter 50 (step S41). Specifically, the failure determination unit 72 causes the switching control unit 65 to change the three-phase winding group from the

windings

31A, 32A, 33A (first group) to the

windings

31B, 32B, 33B (second group). It is determined whether or not it has been switched to. If the failure determination unit 72 determines that it is before switching the three-phase winding set (step S41: YES), it determines the normal voltage phase control amount before switching the three-phase winding set as reference data. (Step S42). That is, when the determination in step S41 is affirmative, failure determination unit 72 is in a state where

windings

31A, 32A, 33A (first set of three-phase windings) are connected to inverter 50 when MG 130 is normal. The data (see FIG. 10) in which the relationship between the magnitude of the electrical load, the rotational speed Ne of the engine 20 and the voltage phase control amount of the inverter 50 is stored is determined as reference data. Thereafter, the failure determination unit 72 once ends this series of processing (END).

On the other hand, when the failure determination unit 72 determines in the determination process in step S41 that the set is not before switching the three-phase winding set (step S41: NO), the failure determination unit 72 is in a normal state after switching the three-phase winding set. The voltage phase control amount is determined as reference data (step S43). That is, when the determination in step S41 is negative, failure determination unit 72 is in a state where

windings

31B, 32B, and 33B (second set of three-phase windings) are connected to inverter 50 when MG 130 is normal. The data (see FIG. 11) in which the relationship among the magnitude of the electrical load, the rotational speed Ne of the engine 20 and the voltage phase control amount of the inverter 50 is stored is determined as reference data. Thereafter, the failure determination unit 72 once ends this series of processing (END).

According to the present embodiment, the MG 130 includes a first set of

windings

31A, 32A, and 33A and a second set of

windings

31B, 32B, and 33B. The MG 130 can switch a set of three-phase windings connected to the inverter 50 by switching

units

37, 38, and 39. The storage unit 71 of the failure detection device 70 stores, for each set of three-phase windings, a phase controlled based on the operating state of the engine 20 during power conversion by the inverter 50 when the MG 130 is normal. Then, the failure determination unit 72 of the failure detection device 70 selects the normal voltage phase control amount data stored in the storage unit 71 according to the set of three-phase windings connected to the inverter 50. The reference data to be used during the failure detection process is determined. The failure determination unit 72 is based on the amount of deviation between the phase during power conversion controlled by the control amount calculation unit 60 and the phase during power conversion when the MG 130 is normal stored in the storage unit 71. A failure of MG 130 is determined. Thereby, failure detection device 70 can detect the failure early and accurately for each set of three-phase windings included in MG 130.

It should be noted that the first and second embodiments can be modified as follows.

In the modification of the first and second embodiments, the rotational speed Ne of the engine 20 may be calculated based on a detection value of a crank angle sensor that detects the crank angle of the engine 20. Further, as information indicating the operating state of the engine 20, a value obtained by performing arithmetic processing on the rotational speed Ne, a rotational speed of a camshaft (not shown) provided in the engine 20 or the like is used instead of the rotational speed Ne of the engine 20. May be.

In the modification of the first embodiment, the failure determination unit 72 adds a counter from the time point when the determination in step S22 of FIG. 4 or step S32 of FIG. 6 is affirmed. Then, failure determination unit 72 may determine that MG 30 is abnormal on condition that the count value exceeds a predetermined count value. That is, failure determination unit 72 may determine that MG 30 is abnormal on the condition that the determination in step S22 in FIG. 4 or step S32 in FIG. 6 is affirmed for a predetermined time. In the second embodiment, the voltage phase control amount data at the normal time referred to when executing the failure detection processing illustrated in FIGS. 4 and 6 depends on the set of three-phase windings connected to the inverter 50. Can be switched. Therefore, in the modification of the second embodiment, the failure determination unit 72 may set a counter for each set of three-phase windings. According to such a configuration, the failure determination unit 72 can hold the count value in the counter before switching even if the set of three-phase windings connected to the inverter 50 is switched during counting by the counter. And the failure determination part 72 can detect the disconnection etc. for every group of a three-phase winding based on the count value by the counter of each group of a three-phase winding.

In the first and second embodiments, the example in which a failure of the MG 30 or MG 130 is detected when the MG 30 or MG 130 executes power generation has been described. On the other hand, in this modification, when MG 30 or MG 130 assists the driving force of engine 20 with the power supplied from DC power supply 40, a failure of MG 30 or MG 130 may be detected. That is, when MG 30 or MG 130 executes driving (powering), a failure of MG 30 or MG 130 may be detected. In this case, the control amount calculation unit 60 executes advance / retard angle control of the voltage phase control amount based on the target drive torque instead of the advance / retard angle control of FIG. Specifically, even when the MG 30 executes driving, the control amount calculation unit 60 turns on each phase of the inverter 50 for a period of 180 ° in terms of the rotation angle (electrical angle) of the rotor and turns off the period of 180 °. Repeat the process. Such control is called rectangular wave voltage control. Further, the control amount calculation unit 60, instead of the rectangular wave voltage control, repeats on / off between rotation angles (electrical angles) of the rotor of 180 °, sine wave drive control, overmodulation drive control, and on period You may use 120 degree | times conduction control which becomes 120 degrees. Then, the control amount calculation unit 60 advances the voltage phase control amount when the target drive torque is larger than the current drive torque of the MG 30. Control amount calculation unit 60 retards the voltage phase control amount when the target drive torque is smaller than the current drive torque of MG 30. Furthermore, in this modification, the relationship in which the electric load in FIG. 3 is replaced with the power supply voltage and the retardation amount is replaced with the advance amount is measured in advance, and the measurement result is stored. The control amount calculation unit 60 may perform at least one of the failure detection processes in FIGS. 4 and 6 using the measurement result.

The torque T of the motor can be calculated by the equation T = p · Φ · iq. p is the number of magnetic pole pairs, Φ is an induced voltage constant, and iq is a q-axis current. p and Φ are fixed values. Therefore, the torque T can be easily calculated using iq. iq can be obtained by referring to map data set in advance based on the voltage phase control amount, the power supply voltage, and the motor rotation speed.

The advance / retard angle control of the voltage phase control amount in this modification will be specifically described with reference to the flowchart of FIG. The control amount calculator 60 of the present modification sets an initial value for the voltage phase control amount (step S51). The initial value is a voltage phase control amount at the time of idling of engine 20 when MG30 or MG130 is normal (normal value at idling).

Subsequently, the control amount calculation unit 60 determines whether or not the target torque is larger than the current torque (step S52). When it is determined that the target torque is larger than the current torque (step S52: YES), the control amount calculation unit 60 calculates the advance angle addition amount (step S53). The advance angle addition amount is an amount by which the phase of the applied voltage Vu, Vv, Vw is advanced with respect to the magnetic pole position sensor signal. In this modification, the relationship between the difference ΔT between the target torque and the current torque (ΔT = target torque−current torque) and the advance angle addition amount is set in a table in advance. That is, in the present embodiment, map data in which the correspondence relationship between the difference ΔT and the advance angle addition amount is set is stored in advance in a storage device included in the control amount calculation unit 60. Therefore, the control amount calculation unit 60 refers to this table and calculates the advance angle addition amount based on the difference ΔT. This table may be set according to the rotational speed Ne of the engine 20.

Subsequently, the control amount calculation unit 60 calculates the voltage phase control amount by adding the advance angle addition amount to the voltage phase control amount set in the process of step S51 (step S54). Then, the control amount calculation unit 60 once ends this series of processing (END).

On the other hand, when it is determined that the target torque is equal to or less than the current torque (step S52: NO), the control amount calculation unit 60 calculates the retard addition amount (step S55). The retardation addition amount is an amount that retards the phase of the applied voltages Vu, Vv, and Vw with respect to the magnetic pole position sensor signal. In this modification, the relationship between the difference ΔT between the target torque and the current torque and the retard addition amount is set in the table in advance. The control amount calculation unit 60 refers to this table and calculates the retard addition amount based on the difference ΔT. This table may be set according to the rotational speed Ne of the engine 20.

Subsequently, the control amount calculation unit 60 calculates the voltage phase control amount by subtracting the retardation addition amount from the voltage phase control amount set in the process of step S51 (step S56). Then, the control amount calculation unit 60 once ends this series of processing (END).

As described above, in this modification, it is assumed that the MG 30 or the MG 130 executes driving (powering). In this case, the voltage phase control amount of the inverter 50 is advanced as the power supply voltage is lower and the rotational speed Ne of the engine 20 is higher.

As in the case where the MG 30 or MG 130 executes power generation, in the present modification, the failure determination unit 72 of the failure detection device 70 causes the failure of the MG 30 or MG 130 according to the processing procedure illustrated in the flowchart of FIG. 4 or FIG. Is detected.

For example, assume that a wire breakage occurs in the U-phase winding 31 of the MG 30. Thereby, the current torque becomes smaller than the target torque, and the advance angle addition amount is increased. Then, the advance angle 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 increases. Thereafter, it is assumed that the amount of deviation between the actual voltage phase control amount and the normal voltage phase control amount is larger than the failure determination threshold. Thereby, it is determined that MG30 is abnormal. Then, the failure determination flag is set to ON.

MG and alternator can be adopted as a three-phase rotating electric machine when a failure of the three-phase rotating electric machine is detected during power generation by the three-phase rotating electric machine. Further, in the case of detecting a failure of the three-phase rotating electrical machine when executing the driving (powering) by the three-phase rotating electrical machine, an MG or a motor can be adopted as the three-phase rotating electrical machine.

As mentioned above, although embodiment of the technique of this indication was described, the technique of this indication is not limited to the said embodiment. The technology of the present disclosure can be applied to various embodiments without departing from the gist of the present disclosure.

For example, as another embodiment [1], the failure determination unit 72 has a deviation amount between the current voltage phase control amount and the normal voltage phase control amount larger than the failure determination threshold (predetermined amount). In such a case, the failure determination of the MG 30 is temporarily suspended as a temporary determination. Then, the failure determination unit 72 determines that the change rate of the amount of deviation between the phase controlled during power conversion and the phase when the MG 30 is normal is greater than the failure determination threshold (predetermined speed). As a determination, it may be determined that the MG 30 has failed.

The storage unit 71 stores the voltage phase controlled based on the operating state of the engine 20 during power conversion by the inverter 50 and the change rate of the voltage phase when the MG 30 is normal.

In another embodiment [1], the failure determination threshold is determined based on the voltage phase stored in the storage unit 71 and the change rate of the voltage phase. And the said determination is performed according to the process sequence of the flowchart illustrated in FIG.4 and FIG.6.

Further, as another embodiment [2], the failure determination unit 72 may reverse the execution order of the temporary determination and the main determination of the other embodiment [1]. That is, the failure determination unit 72 temporarily holds the failure determination of the MG 30 as a temporary determination when the change rate of the deviation amount becomes larger than the failure determination threshold. The failure determination unit 72 determines that the MG 30 has failed as the main determination when the difference between the current voltage phase control amount and the normal voltage phase control amount is larger than the failure determination threshold. May be determined.

In another embodiment [2], the failure determination unit 72 does not immediately determine that the MG 30 is abnormal even if the rate of change of the divergence increases and the failure determination threshold is exceeded momentarily. The failure determination unit 72 determines that the MG 30 has failed as the main determination when the difference between the current voltage phase control amount and the normal voltage phase control amount is larger than the failure determination threshold. To do. Therefore, in other embodiment [2], failure determination with higher accuracy can be performed.

Thereby, in the other embodiment [2], it is possible to suppress the transmission of an unintended abnormality to the passenger, and it is possible to accurately detect the failure of the rotating electrical machine.

DESCRIPTION OF SYMBOLS 10,110 ... System, 20 ... Engine, 30, 130 ... MG, 40 ... DC power supply, 50 ... Inverter, 60 ... Voltage phase control amount calculation part (phase control part), 70 ... Fault detection apparatus, 71 ... Memory | storage part, 72: A failure determination unit.

Claims

An engine (20);
A rotating electrical machine (30, 130) coupled to the engine to transmit power;
DC power supply (40),
An inverter (50) for converting power between the rotating electrical machine and the DC power source;
A phase control unit (60) for controlling a phase of turning on / off each phase of the inverter at the time of power conversion based on an operating state of the engine;
A failure detection device (70) for a rotating electrical machine applied to a system (10, 110) comprising:
A storage unit (71) for storing the phase controlled based on the operating state of the engine at the time of power conversion when the rotating electrical machine is normal;
Based on the amount of divergence between the phase at the time of the power conversion controlled by the phase control unit and the phase at the time of the power conversion at the normal time of the rotating electrical machine stored in the storage unit, A failure determination unit (72) for determining a failure of the rotating electrical machine;
A failure detection apparatus for a rotating electrical machine.
The failure determination unit
The rotating electrical machine failure detection device according to claim 1, wherein when the deviation amount is larger than a predetermined amount, it is determined that the rotating electrical machine has failed.
The failure determination unit
The failure detection device for a rotating electrical machine according to claim 1 or 2, wherein when the change rate of the deviation amount is faster than a predetermined change rate, it is determined that the rotating electrical machine has failed.
The rotating electrical machine (130)
A plurality of sets of three-phase windings (31A, 32A, 33A: 31B, 32B, 33B) are provided, and the set of three-phase windings connected to the inverter can be switched.
The storage unit
During normal operation of the rotating electrical machine, the phase controlled based on the operating state of the engine at the time of the power conversion is stored for each set of the three-phase windings,
The failure determination unit
In the set of three-phase windings connected to the inverter, the phase during the power conversion controlled by the phase control unit, and the phase during the power conversion stored in the storage unit The failure detection apparatus for a rotating electrical machine according to any one of claims 1 to 3, wherein a failure of the rotating electrical machine is determined based on the deviation amount.
The operating state of the engine is
The failure detection apparatus for a rotating electrical machine according to any one of claims 1 to 4, comprising a rotation speed of the engine.
The rotating electric machine is
Power generation can be performed by power transmitted from the engine,
The system
One or more auxiliary machines (80)
The operating state of the engine is
The failure detection apparatus for a rotating electrical machine according to any one of claims 1 to 5, including an electric load of the auxiliary machine.