JP2018121495A - Rotary electric machine control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately grasp an abnormality in a rotary electric machine and, hence, appropriately drive the rotary electric machine.SOLUTION: A field circuit 23 has a first switch 51 and a second switch 52 connected in series between a power source part and the ground, and a field coil 26 is provided in a parallel path part connected to both ends of the second switch 52 and parallel to the second switch 52. The switches 51, 52 are respectively on/off controlled by a duty signal so as to be turned on in opposite periods. A rotary electric machine ECU 24 comprises: an acquiring section that acquires an electric current detection value of energization electric current flowing in the field circuit 23; an abnormality determining section that determines an abnormality in the field circuit 23 on the basis of the duty signal and electric current detection value; and a fail safe processing section that performs a predetermined fail safe process in a case where an occurrence of an abnormality is determined.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rotating electrical machine control device.

  In a wound field type rotating electrical machine, in a field circuit, a pair of switching elements are provided in series between a power supply unit and a ground, and the field winding is obtained by alternately turning on and off the pair of switching elements. A field current flows through. In this case, if any abnormality occurs in the field circuit, the rotating electric machine cannot properly generate a magnetic field, and there is a concern that the driving of the rotating electric machine may be adversely affected.

  For example, in Patent Document 1, as a technique for determining a wear state of a brush, a brush that determines a brush wear state based on a current value flowing through a field winding of a generator via a brush or an output voltage value of the generator. A technique including a wear determination circuit is disclosed. According to the technology, it is not necessary to install a detection element for detecting the brush wear limit near the brush, and it is possible to provide an apparatus with excellent productivity and reliability.

JP 2005-168214 A

  However, it is considered that simply using the current value flowing through the field winding or the output voltage value of the generator is insufficient to accurately diagnose the abnormality of the field circuit. Various abnormalities of the field circuit are assumed besides the wear of the brush. From this point of view, it is considered that an improvement in technology for abnormality diagnosis of field circuits is desired.

  The present invention has been made in view of the above problems, and a main object thereof is to provide a control device for a rotating electrical machine capable of properly grasping the abnormality of the rotating electrical machine and thus appropriately driving the rotating electrical machine. It is in.

  Hereinafter, means for solving the above-described problems and the effects thereof will be described. In the following, for ease of understanding, the reference numerals of the corresponding components in the embodiments of the invention are appropriately shown in parentheses, but are not limited to the specific configurations shown in parentheses.

In the first means,
A rotating electrical machine (21) having an armature winding (25) and a field winding (26), and a plurality of switching elements (51 to 55), and the field windings depending on on / off of the switching elements. A rotating electrical machine control device (24) applied to a rotating electrical machine unit (16) comprising a field circuit (23) to be energized,
The field circuit includes, as the plurality of switching elements, a first switching element (51) and a second switching element (52) connected in series between a power supply unit (11, 12) and a ground. Among these switching elements, the field winding is provided in a parallel path portion connected to both ends of the second switching element on the ground side and in parallel with the second switching element, and the switching elements conflict with each other. Each is turned on and off by a duty signal so that it is turned on in a period,
An acquisition unit that acquires a current detection value for an energization current flowing through the field circuit;
An abnormality diagnosis unit that performs abnormality diagnosis of the field circuit based on the duty signal and the current detection value;
A fail-safe processing unit that performs a predetermined fail-safe process when an abnormality occurrence is diagnosed by the abnormality diagnosis unit;
Is provided.

  In the field circuit of the rotating electrical machine unit, when an abnormality occurs, an abnormal value is generated as the duty ratio of the duty signal, or an abnormal value is generated as a current detection value. In this regard, according to the above configuration, the field circuit abnormality diagnosis is appropriately performed based on the duty signal and the current detection value, and the fail-safe process is appropriately performed based on the result of the abnormality diagnosis. By taking into account the point of current flowing through the field circuit in accordance with the duty signal, the abnormality diagnosis of the field circuit can be properly performed. As a result, it is possible to properly grasp the abnormality of the rotating electrical machine and thereby drive the rotating electrical machine appropriately.

  The second means is a rotating electrical machine control device that calculates a duty ratio of the duty signal based on a target energization current and the detected current value, wherein the abnormality diagnosis unit corresponds to the duty ratio and the duty ratio. In determining the correlation with the energization current of the field circuit, it is determined whether or not there is a correlation shift that deviates to the side where the duty ratio becomes larger than the predetermined normal range according to the current detection value. The abnormality diagnosis is performed.

  In the field circuit, for example, when an element failure that prevents the first switching element from being fully turned on or an increase in the contact resistance of the brush due to wear occurs, the path resistance of the field circuit may increase unintentionally. . In this case, in the correlation between the duty ratio and the energization current, the actual duty ratio deviates from the predetermined normal range. Therefore, the field circuit abnormality diagnosis is preferably performed based on the correlation deviation. Can be implemented.

  A third means is a rotating electrical machine control device that calculates a duty ratio of the duty signal based on a target energization current and the detected current value, wherein the abnormality diagnosis unit corresponds to the duty ratio and the duty ratio. In determining the correlation with the energization current of the field circuit to determine whether or not there is a correlation shift that deviates to the side where the duty ratio becomes smaller than the predetermined normal range according to the current detection value, The abnormality diagnosis is performed.

  In a field circuit, for example, when a short circuit occurs in an intermediate portion of a field winding (intermediate short circuit occurs), it is considered that the path resistance of the field circuit is unintentionally reduced due to the short circuit. In this case, in the correlation between the duty ratio and the energization current, the actual duty ratio deviates from the predetermined normal range, so that the field circuit abnormality diagnosis is preferably performed based on the correlation deviation. Can be implemented.

  In the fourth means, the fail-safe processing unit adds a limit to the energization current flowing in the field winding as the fail-safe processing when the abnormality diagnosis unit determines that the correlation shift has occurred. .

  For example, in the case where a correlation shift occurs that causes the actual duty ratio to deviate from the normal range, the path resistance of the field circuit may be unintentionally increased. In such a case, there is a concern that the amount of heat generated in the field circuit increases if the field winding is energized as usual. In this regard, heat generation in the field circuit can be suppressed by adding a limit to the energization current flowing through the field winding as fail-safe processing.

  Moreover, when the correlation shift | offset | difference which remove | deviates from the actual duty ratio becomes small with respect to a normal range arises, it is possible that the path resistance of a field circuit is unintentionally small. In such a case, if the field winding is energized as usual, there is a concern that the energization current of the field circuit may increase unintentionally. In this respect, by applying a restriction to the energization current flowing through the field winding as a fail-safe process, the energization current of the field circuit can be appropriately controlled.

  In the case where the field circuit has an H-bridge configuration, when an element failure occurs in which the fourth switching element (fourth switch 54 in FIG. 2) provided in parallel with the second switching element cannot be fully turned on, It is conceivable that the path resistance of the magnetic circuit increases unintentionally. In this case, abnormality diagnosis of the field circuit may be performed based on the correlation deviation as described above, and a restriction may be added to the energization current flowing through the field winding as fail-safe processing.

  In the fifth means, the abnormality diagnosis unit determines whether the detected current value remains zero or whether the detected current value decreases when the duty ratio of the duty signal increases. Thus, the abnormality diagnosis is performed.

  In the field circuit, when an off failure (open failure) of the first switching element occurs, it is conceivable that the current does not flow or decreases even when the duty ratio of the duty signal increases. In this case, by monitoring the change in the current detection value when the duty ratio of the duty signal increases, the field circuit abnormality diagnosis can be suitably performed.

  In a sixth means, the field circuit includes, as the plurality of switching elements, a third switching element (53) provided in parallel with the first switching element in addition to the first switching element and the second switching element. And a fourth switching element (54) provided in parallel with the second switching element, and these switching elements are connected in an H-bridge shape, and the third switching element is always connected. Rotation for controlling the energization current of the field winding by alternately turning on and off the first switching element and the second switching element by the duty signal while the fourth switching element is always on. In the electric machine control device, the fail safe processing unit is configured to perform the duty by the abnormality diagnosis unit. When it is determined that the current detection value remains zero or the current detection value decreases when the duty ratio of the signal increases, the first switching element is always off as the fail-safe process, The third switching element and the fourth switching element are alternately turned on and off by the duty signal in a state where the second switching element is always on, and the field winding is reversely excited.

  According to the above configuration, when the energization current does not flow or decreases even when the duty ratio of the duty signal increases due to an off-failure (open failure) of the first switching element, The energization current of the field winding is controlled by performing reverse excitation by alternately turning on and off the third switching element and the fourth switching element while the switching element is always off and the second switching element is always on. . Thereby, field current control can be continuously implemented after the OFF failure of the 1st switching element arises.

  In the seventh means, a diode (Di) is connected in parallel to the second switching element in a direction allowing a current flow from the ground side to the power supply unit side. In the field circuit, Among the electrical paths at both ends of the two switching elements, a reflux current detection unit (56) that detects a reflux current that flows in a state where the first switching element is off and the second switching element is on in the ground-side electrical path The acquisition unit acquires the return current detection value detected by the return current detection unit, and the abnormality diagnosis unit turns on the first switching element according to the duty signal, and the second switching Whether or not the return current detection value in the direction from the ground side to the power supply side through the second switching element is greater than or equal to a predetermined value in a state where the element is turned off. By determining, implementing the abnormality diagnosis.

  In the field circuit, in the state where the first switching element is turned on and the second switching element is turned off by the duty signal, an energization current flows from the power supply unit to the ground via the field winding, and then the first switching element. When the switch is turned off and the second switching element is turned on, the return current continuously flows through the field winding even when the connection with the power supply is cut off. In such an energization mode, when an off failure (open failure) of the first switching element occurs when a current is flowing through the field winding, the first switching element is on and the second switching element is off. Nevertheless, the return current (current flowing from the ground side to the power supply side through the second switching element) flows to the return current detection unit via the diode provided in antiparallel with the second switching element. Can be considered. Therefore, by monitoring the return current detection value in a state where the first switching element is turned on and the second switching element is turned off by the duty signal, the field circuit abnormality diagnosis can be suitably performed.

  In an eighth means, the field circuit includes, as the plurality of switching elements, a third switching element (53) provided in parallel with the first switching element in addition to the first switching element and the second switching element. And a fourth switching element (54) provided in parallel with the second switching element, and these switching elements are connected in an H-bridge shape, and the third switching element is always connected. Rotation for controlling the energization current of the field winding by alternately turning on and off the first switching element and the second switching element by the duty signal while the fourth switching element is always on. In the electric machine control device, the fail safe processing unit is configured to perform the duty by the abnormality diagnosis unit. When the first switching element is turned on and the second switching element is turned off by the signal, the return current detection value in the direction from the ground side to the power supply unit side through the second switching element is greater than or equal to a predetermined value. When the determination is made, as the fail-safe process, the third switching element and the fourth switching element are determined by the duty signal in a state in which the first switching element is always off and the second switching element is always on. Are alternately turned on and off to cause reverse excitation of the field winding.

  According to the above configuration, when the first switching element is turned off and the second switching element is turned off by the duty signal due to an off failure (open failure) of the first switching element, the return current flows. In addition, as a fail-safe process, the third switching element and the fourth switching element are alternately turned on and off in a state where the first switching element is always off and the second switching element is always on. The energization current of the winding is controlled. Thereby, field current control can be continuously implemented after the OFF failure of the 1st switching element arises.

  According to a ninth means, in the field circuit, the parallel path portion includes a field current flowing through the field winding between the field winding and a ground-side end portion of the second switching element. A field current detection unit (55) for detecting a current is provided, and the first switching element is off in the ground-side electrical path among the electrical paths at both ends of the second switching element, and the second switching element A return current detection unit (56) for detecting a return current flowing in a state in which is turned on, the acquisition unit acquires the field current detection value detected by the field current detection unit, The return current detection value detected by the return current detection unit is acquired, and the abnormality diagnosis unit does not decrease and change the field current detection value even when the duty ratio of the duty signal is reduced. Based on the return current detection value of the orientation of the ground side through the switching element to the power supply unit side remains below a predetermined value, carrying out the abnormality diagnosis.

  In the field circuit, when an ON failure (closed failure) of the first switching element occurs, the power source side and the field winding remain connected via the first switching element, and the field winding It is conceivable that an excessive current flows continuously. In addition, it is considered that the return of the energized current (energization in the direction from the ground side to the power supply side through the second switching element) does not occur. Therefore, even if the duty ratio of the duty signal decreases, the field current detection value does not decrease and the return current detection value in the direction from the ground side to the power supply side through the second switching element remains below a predetermined value. Thus, abnormality diagnosis of the field circuit can be suitably performed.

  In a tenth means, the field circuit has a cutoff switch (50) between the power supply unit and the first switching element, which conducts or cuts off between the power supply unit and the first switching element. The fail-safe processing unit is configured such that the field current detection value does not decrease and the return current detection value is zero even when the duty ratio of the duty signal is reduced by the abnormality diagnosis unit. When it is determined, instead of alternately turning on and off the first switching element and the second switching element as the fail-safe process, the cutoff switch and the second switching element are alternately turned on and off.

  As a fail-safe process, instead of alternately turning on and off the first switching element and the second switching element, the cutoff switch and the second switching element are alternately turned on and off. As a result, when an on-failure (closed failure) of the first switching element occurs, field current control equivalent to that before the failure occurs can be performed, and appropriate fail-safe processing can be performed.

  In the eleventh means, the abnormality diagnosis unit determines whether or not the amount of fluctuation of the current detection value within a predetermined time is greater than or equal to a predetermined amount, or the amount of fluctuation of the duty ratio of the duty signal within a predetermined time is predetermined. The abnormality diagnosis is performed by determining whether or not the above is true.

  In the field circuit, when an off failure (open failure) of the second switching element occurs, the return current does not flow, and thus it is conceivable that the amount of fluctuation (current ripple) in the energization current accompanying the on / off of each switching element increases. . Further, in the configuration in which the duty ratio of the duty signal is calculated based on the target energization current and the current detection value, it is conceivable that the variation amount of the duty ratio increases due to the fluctuation of the energization current. Therefore, the abnormality diagnosis of the field circuit is suitably performed based on the fluctuation amount of the current detection value within a predetermined time being equal to or larger than the predetermined value or the fluctuation amount of the duty ratio within the predetermined time being equal to or larger than the predetermined value. be able to.

  In addition to the OFF failure (open failure) of the second switching element, when a short circuit occurs in the middle part of the field winding (intermediate short circuit occurs), the path resistance of the field circuit is unintentionally reduced, As a result, it is conceivable that the variation amount of the duty ratio becomes large. In this case, the abnormality diagnosis may be performed based on the fluctuation amount of the current detection value or the fluctuation amount of the duty ratio as described above.

  In a twelfth means, the fail-safe processing unit determines that the abnormality diagnosis unit determines that the fluctuation amount of the current detection value within a predetermined time is greater than or equal to a predetermined value, or the duty ratio within the predetermined time. When it is determined that the fluctuation amount is greater than or equal to a predetermined amount, a limit is added to the energization current flowing through the field winding as the fail-safe process.

  As a fail-safe process, a limit is added to the energization current flowing in the field winding. As a result, an appropriate fail-safe process is performed when the fluctuation amount of the energizing current (current ripple) increases due to the OFF failure (open failure) of the second switching element or the fluctuation amount of the duty ratio increases. Can be implemented.

  When a diode (for example, a parasitic diode) is provided in the second switching element in antiparallel, that is, when a diode is provided in parallel in the second switching element with the cathode as the power supply side and the anode as the ground side, By adding a restriction to the flowing current, the current flowing through the diode is limited. Therefore, it is possible to protect the diode when the second switching element is off.

  In a thirteenth aspect, in the field circuit, the first switching element is turned off and the second switching element is turned on in the ground-side electric path among the electric paths at both ends of the second switching element. The return current detection unit (56) for detecting the return current flowing through the return current is provided, the acquisition unit acquires the return current detection value detected by the return current detection unit, and the abnormality diagnosis unit Whether the return current detection value in the direction from the power supply side to the ground side through the second switching element is greater than or equal to a predetermined value in a state where the first switching element is turned on and the second switching element is turned off by a signal The abnormality diagnosis is carried out by determining whether or not.

  In the field circuit, when an ON failure (closed failure) of the second switching element occurs, an excessive current (through the second switching element) is passed through the first switching element and the second switching element while the first switching element is turned on. It is conceivable that a through current in the direction from the power supply unit side to the ground side flows. In this case, the abnormality diagnosis of the field circuit can be suitably performed by monitoring the return current detection value in a state where the first switching element is turned on and the second switching element is turned off by the duty signal.

  In a fourteenth means, the field circuit includes, as the plurality of switching elements, a third switching element (53) provided in parallel with the first switching element in addition to the first switching element and the second switching element. And a fourth switching element (54) provided in parallel with the second switching element, and these switching elements are connected in an H-bridge shape, and the third switching element is always connected. Rotation for controlling the energization current of the field winding by alternately turning on and off the first switching element and the second switching element by the duty signal while the fourth switching element is always on. An electric machine control device, wherein the fail-safe processing unit is configured to cause the abnormality diagnosis unit to When the first switching element is turned on and the second switching element is turned off by a signal, the return current detection value in the direction from the power supply unit side to the ground side through the second switching element is greater than or equal to a predetermined value. When the determination is made, as the fail-safe process, the third switching element and the fourth switching element are determined by the duty signal in a state in which the first switching element is always off and the second switching element is always on. Are alternately turned on and off to cause reverse excitation of the field winding.

  According to the above configuration, the third switching element is always turned off and the second switching element is always turned on as a fail-safe process at the time of abnormality diagnosis associated with the on failure (closed failure) of the second switching element. The energizing current of the field winding is controlled by performing reverse excitation by alternately turning on and off the switching element and the fourth switching element. Thereby, field current control can be continuously implemented after the ON failure of the second switching element occurs.

  In a fifteenth aspect, the field circuit includes a cutoff switch (50) between the power supply unit and the first switching element, which conducts or cuts off between the power supply unit and the first switching element. The fail-safe processing unit is configured such that the abnormality diagnosis unit causes the power supply unit side to pass through the second switching element in a state where the first switching element is turned on and the second switching element is turned off by the duty signal. When the return current detection value in the direction from the ground to the ground side is determined to be greater than or equal to a predetermined value, the cutoff switch is set to the cutoff state as the fail-safe process.

  As a fail-safe process, the cutoff switch provided between the power supply unit and the first switching element is put into a cutoff state. Thereby, an appropriate fail-safe process can be performed when an ON failure (closed failure) of the second switching element occurs.

  In a sixteenth means, the field circuit includes, as the plurality of switching elements, a third switching element (53) provided in parallel with the first switching element in addition to the first switching element and the second switching element. And a fourth switching element (54) provided in parallel with the second switching element, and these switching elements are connected in an H-bridge shape, and the third switching element is always connected. Rotation for controlling the energization current of the field winding by alternately turning on and off the first switching element and the second switching element by the duty signal while the fourth switching element is always on. In the electric machine control device, the abnormality diagnosis unit includes the third switching element and the fourth switch. By determining whether more than a predetermined current flows through the series path of the grayed elements, carrying out the abnormality diagnosis.

  In the field circuit, when an ON failure (closed failure) of the third switching element occurs, an excessive current (through current) is passed through the third switching element and the fourth switching element because the fourth switching element is always on. ) May flow. In this case, the field circuit abnormality diagnosis can be suitably performed by determining whether or not a predetermined current or more has flowed through the series path of the third switching element and the fourth switching element.

  In the seventeenth means, the field circuit has a cutoff switch (50) between the power supply unit and the first switching element, which conducts or cuts off between the power supply unit and the first switching element. The fail-safe processing unit, when it is determined by the abnormality diagnosis unit that a current greater than or equal to a predetermined amount flows in a series path of the third switching element and the fourth switching element, as the fail-safe process, In the state where the first switching element is always off and the second switching element is always on, the cutoff switch and the fourth switching element are alternately turned on and off by the duty signal to reversely excite the field winding. To do.

  According to the above configuration, when an excessive current (through current) flows through the third switching element and the fourth switching element due to an ON failure (closed failure) of the third switching element, The energization current of the field winding is controlled by performing reverse excitation by alternately turning on and off the cutoff switch and the fourth switching element in a state where one switching element is always off and the second switching element is always on. Thereby, field current control can be continuously performed after the on-failure of the third switching element occurs.

  In an eighteenth means, the rotating electrical machine unit includes an inverter circuit (22) that supplies an energization current to the armature winding in accordance with a rotational phase of the rotating electrical machine, and the failsafe processing unit includes the inverter The reverse excitation is performed with the current phase of the armature winding in the circuit shifted by 180 degrees.

  As the fail-safe process, the field winding is reversely excited while the current phase of the armature winding in the inverter circuit is shifted by 180 degrees, so that the rotation state of the rotating electrical machine can be changed even after the fail-safe process. Can keep good.

  In a nineteenth means, when the failure safe processing unit determines that the abnormality has occurred, at least after the elapse of a predetermined time having a time width in which the energization current flowing through the field winding is once zero, The reverse excitation is started.

  When reverse excitation of the field winding is performed, the direction of the energization current in the field winding is opposite to that of normal excitation. At this point, when it is determined that an abnormality has occurred, reverse excitation is started after a lapse of a predetermined time having a time width at which the energization current flowing through the field winding is once zero. To reverse excitation can be properly implemented.

  In the twentieth means, the field circuit has a cutoff switch (50) between the power supply unit and the first switching element, for conducting or blocking between the power supply unit and the first switching element. The fail-safe processing unit, when it is determined by the abnormality diagnosis unit that a current greater than or equal to a predetermined amount flows in a series path of the third switching element and the fourth switching element, as the fail-safe process, The cut-off switch is turned off.

  As a fail-safe process, the cutoff switch provided between the power supply unit and the first switching element is put into a cutoff state. Thereby, when an on-failure (closed failure) of the third switching element occurs, an appropriate fail-safe process can be performed.

  In the twenty-first means, the fail-safe processing unit turns off each of the switching elements after the energizing current flowing through the field winding becomes zero as the fail-safe processing by setting the shut-off switch to a shut-off state. To do.

  As a fail-safe treatment, all the switching elements were turned off after the cut-off switch was turned off and the energizing current flowing through the field winding became zero. As a result, it is possible to suppress the inconvenience that the path is interrupted while a large current is still flowing through the energization path including the field winding, and the switching element is surge-damaged due to this.

  In a twenty-second means, in the field circuit, the parallel path section includes a field current flowing through the field winding between the field winding and a ground-side end of the second switching element. A field current detection unit (55) for detecting a current is provided, and the first switching element is off in the ground-side electrical path among the electrical paths at both ends of the second switching element, and the second switching element A return current detection unit (56) for detecting a return current flowing in a state in which is turned on, the acquisition unit acquires the field current detection value detected by the field current detection unit, The return current detection value detected by the return current detection unit is acquired, and the abnormality diagnosis unit detects that the field current detection value is zero even when the duty ratio of the duty signal increases, and the first The return current detection value of the orientation of the ground side through the switching element to the power supply unit side based on the predetermined or higher, carrying out the abnormality diagnosis.

  In the field circuit, when a ground short occurs in the electrical path connected to the ground side terminal (low side terminal) of the second switching element among the electrical paths at both ends of the field winding, Although the field winding is energized and the subsequent energization current is recirculated (current is applied in the direction from the ground side to the power supply unit through the second switching element), current detection by the field current detection unit cannot be performed. It is possible. Therefore, even when the duty ratio increases, the field current detection value is zero, and the return current detection value is equal to or greater than a predetermined value, so that the field circuit abnormality diagnosis can be suitably performed.

  In the twenty-third means, the fail safe processing unit causes the abnormality diagnosing unit to detect the field current detected value is zero even when the duty ratio of the duty signal is increased, and to pass the ground side through the second switching element. The first switching element is turned off as the fail-safe process when it is determined that the detected value of the return current in the direction from the power source to the power source is greater than or equal to a predetermined value.

  The first switching element is turned off as fail-safe processing. This makes it possible to perform an appropriate fail-safe process when a ground short occurs on the low-side terminal side of the second switching element in the electrical path at both ends of the field winding.

  In a twenty-fourth means, the abnormality diagnosis unit performs the abnormality diagnosis based on the fact that the detected current value does not decrease and change even when the duty ratio of the duty signal decreases.

  In the field circuit, when a power supply short circuit (power fault) occurs in the electrical path connected to the power supply side terminal (high side terminal) of the second switching element among the electrical paths at both ends of the field winding, It is conceivable that the magnetic winding is always connected and excessive current continuously flows in the field winding. Therefore, by monitoring the change in the current detection value when the duty ratio of the duty signal becomes small, the field circuit abnormality diagnosis can be suitably performed.

  In addition, even when a power supply short circuit occurs in the electrical path connected to the ground-side terminal (low-side terminal) of the second switching element among the electrical paths at both ends of the field winding, excess is performed regardless of the duty signal. Current will flow continuously. Therefore, when the duty ratio of the duty signal becomes small, abnormality diagnosis of the field circuit can be suitably performed by monitoring the change of the current detection value.

  In the twenty-fifth means, the fail-safe processing unit performs the fail-safe processing as the fail-safe processing when the abnormality diagnosis unit determines that the detected current value does not change even when the duty ratio of the duty signal decreases. The second switching element is turned off.

  The second switching element is turned off as fail-safe processing. As a result, an appropriate fail-safe process can be performed when a power supply short circuit occurs on the high-side terminal side of the second switching element in the electrical path at both ends of the field winding.

  In the twenty-sixth means, the field circuit includes, as the plurality of switching elements, a third switching element (53) provided in parallel with the first switching element in addition to the first switching element and the second switching element. And a fourth switching element (54) provided in parallel with the second switching element, and each of the switching elements is connected in an H-bridge shape, and the first switching element and the In place of turning on and off the second switching element, the abnormality diagnosing unit includes a reverse excitation control unit that performs reverse excitation of the field winding by turning on and off the third switching element and the fourth switching element. Performs the abnormality diagnosis based on a change in the detected current value in a state where the reverse excitation is performed.

  In the field circuit of the H bridge configuration, even if an off failure (open failure) of the second switching element or an off failure (open failure) of the third switching element occurs, the energization of the field winding is continued. That is, the field current is detected within the normal range even if either of the second and third switching elements is turned off. Therefore, it may be difficult to determine the off failure of the second and third switching elements. In such a case, instead of turning on and off the first switching element and the second switching element, reverse excitation is performed by turning on and off the third switching element and the fourth switching element, and the reverse excitation is performed. By monitoring the change in the detected current value, it is possible to suitably perform abnormality diagnosis of the field circuit.

The electric circuit diagram which shows a vehicle system. The circuit diagram which shows the electric constitution of a rotary electric machine unit. The circuit diagram which shows the electricity supply path | route in a field circuit. The figure which shows the correlation with a duty ratio and a field current. The flowchart which shows the abnormality diagnosis and the process procedure of fail safe. The figure which shows the relationship between a power supply voltage, the temperature of a rotary electric machine, and an abnormality determination value. The flowchart which shows the process sequence of abnormality diagnosis in another embodiment. The circuit diagram which shows the field circuit of a half bridge structure.

  Hereinafter, embodiments will be described with reference to the drawings. In this embodiment, in a vehicle system that supplies electric power to various devices of a vehicle that runs using an engine (internal combustion engine) as a drive source, an abnormality diagnosis device that performs abnormality diagnosis of the system is embodied. In the following embodiments, parts that are the same or equivalent to each other are given the same reference numerals in the drawings, and the description of the same reference numerals is used.

  As shown in FIG. 1, the vehicle system is a two-power supply system having a lead storage battery 11 and a lithium ion storage battery 12 as a power supply unit. Each storage battery 11, 12 can supply power to the starter 13, various electric loads 14, 15, and the rotating electrical machine unit 16. Further, each of the storage batteries 11 and 12 can be charged by the rotating electrical machine unit 16. In this system, a lead storage battery 11 and a lithium ion storage battery 12 are connected in parallel to the rotating electrical machine unit 16 and the electrical loads 14 and 15, respectively.

  The lead storage battery 11 is a well-known general-purpose storage battery. The lithium ion storage battery 12 is a high-density storage battery that has less power loss during charging / discharging and higher output density and energy density than the lead storage battery 11. The lithium ion storage battery 12 is desirably a storage battery having higher energy efficiency during charging / discharging than the lead storage battery 11. The lithium ion storage battery 12 is configured as an assembled battery having a plurality of single cells. These storage batteries 11 and 12 have the same rated voltage, for example, 12V.

  The lithium ion storage battery 12 is housed in a housing case and configured as a battery unit U integrated with a substrate. The battery unit U has output terminals P1, P2 and P3, of which the lead storage battery 11, the starter 13 and the electric load 14 are connected to the output terminals P1 and P3, and the electric load 15 and the rotation are connected to the output terminal P2. The electric unit 16 is connected.

  The electric loads 14 and 15 have different requirements for the voltage of power supplied from the storage batteries 11 and 12. Among these, the electric load 14 includes a constant voltage required load that is required to be stable so that the voltage of the supplied power is constant or at least fluctuates within a predetermined range. On the other hand, the electric load 15 is a general electric load other than the constant voltage required load.

  Specific examples of the electric load 14 that is a constant voltage required load include various ECUs such as a navigation device, an audio device, a meter device, and an engine ECU. In this case, by suppressing the voltage fluctuation of the supplied power, it is possible to suppress the occurrence of unnecessary reset and the like in each of the above devices, and ensure stable operation. The electric load 14 may include a travel system actuator such as an electric steering device or a brake device. Specific examples of the electric load 15 include a seat heater, a heater for a defroster for a rear window, a headlight, a wiper for a front window, and a blower fan for an air conditioner.

  The rotating electrical machine unit 16 includes a rotating electrical machine 21, an inverter 22, a field circuit 23, and a rotating electrical machine ECU 24 that controls the operation of the rotating electrical machine 21. The rotating electrical machine unit 16 is a generator with a motor function, and is configured as an electromechanically integrated ISG (Integrated Starter Generator). Details of the rotating electrical machine unit 16 will be described later.

  The battery unit U is provided with an electrical path L1 that connects the output terminals P1 and P2 and an electrical path L2 that connects the point N1 on the electrical path L1 and the lithium ion storage battery 12 as an in-unit electrical path. Among these, the switch 31 is provided in the electrical path L1, and the switch 32 is provided in the electrical path L2.

  The battery unit U is provided with a bypass path L3 that bypasses the switch 31. The bypass path L3 is provided so as to connect the output terminal P3 and the point N1 on the electrical path L1. The output terminal P3 is connected to the lead storage battery 11 via the fuse 35. By this bypass path L3, the lead storage battery 11, the electric load 15, and the rotating electrical machine unit 16 can be connected without using the switch 31. In the bypass path L3, for example, a bypass switch 36 composed of a normally closed mechanical relay is provided. By turning on (closing) the bypass switch 36, the lead storage battery 11, the electrical load 15, and the rotating electrical machine unit 16 are electrically connected even when the switch 31 is turned off (opened).

  The battery unit U includes a battery ECU 37 that controls on / off (opening / closing) of the switches 31 and 32. The battery ECU 37 is constituted by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The battery ECU 37 controls the on / off of the switches 31 and 32 based on the storage state of each of the storage batteries 11 and 12 and the command value from the engine ECU 40 that is the host controller. Thereby, charging / discharging is implemented using the lead storage battery 11 and the lithium ion storage battery 12 selectively. For example, the battery ECU 37 calculates the SOC (State Of Charge) of the lithium ion storage battery 12 and controls the charge amount and discharge amount of the lithium ion storage battery 12 so that the SOC is maintained within a predetermined use range.

  The rotating electrical machine ECU 24 of the rotating electrical machine unit 16 and the battery ECU 37 of the battery unit U are connected to an engine ECU 40 as a host controller that manages the ECUs 24 and 37 in an integrated manner. The engine ECU 40 is composed of a microcomputer including a CPU, ROM, RAM, input / output interface, and the like, and controls the operation of the engine 42 based on the engine operating state and the vehicle traveling state each time. Each of the ECUs 24, 37, 40 and other various in-vehicle ECUs (not shown) are connected to each other via a communication line 41 that constructs a communication network such as a CAN and can communicate with each other, and bidirectional communication is performed at a predetermined cycle. Is done. Thereby, the various data memorize | stored in each ECU24,37,40 can be shared mutually.

  Next, the electrical configuration of the rotating electrical machine unit 16 will be described with reference to FIG. The rotating electrical machine 21 is a three-phase AC motor, and includes three-phase armature windings 25, U-phase, V-phase, and W-phase windings 25 U, 25 V, and 25 W, and a field winding 26. Each phase winding 25U, 25V, 25W is star-connected and connected to each other at a neutral point. The rotating shaft of the rotating electrical machine 21 is drivingly connected to an engine output shaft (not shown) by a belt, and the rotating shaft of the rotating electrical machine 21 is rotated by the rotation of the engine output shaft, while the rotating shaft of the rotating electrical machine 21 is rotated. The engine output shaft rotates. That is, the rotating electrical machine 21 has a power generation function that generates power (regenerative power generation) by rotating the engine output shaft and the axle, and a power running function that applies rotational force to the engine output shaft. For example, the rotating electrical machine 21 is driven by powering at the time of engine restart in idling stop control or power assist for vehicle acceleration.

  The inverter 22 converts the AC voltage output from each phase winding 25U, 25V, 25W into a DC voltage and outputs it to the battery unit U. The inverter 22 converts the DC voltage input from the battery unit U into an AC voltage and outputs the AC voltage to the phase windings 25U, 25V, and 25W. The inverter 22 is a bridge circuit having the same number of upper and lower arms as the number of phases of the phase winding, and constitutes a three-phase full-wave rectifier circuit. The inverter 22 constitutes a drive circuit that drives the rotating electrical machine 21 by adjusting the electric power supplied to the rotating electrical machine 21.

  The inverter 22 includes an upper arm switch Sp and a lower arm switch Sn for each phase, and time-series energization is performed for each phase by alternately turning on and off the switches Sp and Sn of each phase. In the present embodiment, voltage controlled semiconductor switching elements are used as the switches Sp and Sn, and specifically, N-channel MOSFETs are used. An upper arm diode Dp is connected in antiparallel to the upper arm switch Sp, and a lower arm diode Dn is connected in antiparallel to the lower arm switch Sn. That is, each of the diodes Dp and Dn is provided in such a direction that the cathode is the power supply side and the anode is the ground side. In the present embodiment, parasitic diodes of the switches Sp and Sn are used as the diodes Dp and Dn. The diodes Dp and Dn are not limited to parasitic diodes, and may be diodes that are separate from the switches Sp and Sn, for example. An intermediate point of the series connection body of the switches Sp and Sn in each phase is connected to one end of each phase winding 25U, 25V, and 25W.

  The inverter 22 is provided with a current detection unit 29 that detects the phase currents Iu, Iv, and Iw in the current path for each phase. The current detection unit 29 has a configuration including, for example, a shunt resistor and a current transformer.

  The field circuit 23 energizes the field winding 26 in accordance with on / off of a plurality of switching elements. The field circuit 23 includes one cutoff switch 50 and four field switches 51, 52, 53, and 54, and the field switches 51 to 54 constitute an H-bridge rectifier circuit. The basic configuration of each of the switches 50 to 54 is the same as that of each switch of the inverter 22, and a diode Di is connected to the semiconductor switching element in antiparallel.

  In the field circuit 23, field switches 51 and 52 serving as a first switching element and a second switching element are connected in series between a power supply unit (battery unit U in FIG. 2) and the ground, and a third switching element. Field switches 53 and 54 as elements and fourth switching elements are connected in series between the power supply unit and the ground. Then, the high side of the field switches 51 and 53, the intermediate points of the field switches 51 and 52 and the field switches 53 and 54, and the low side of the field switches 52 and 54 are electrically connected to each other. The field switches 51 to 54 are connected in an H bridge shape. In this case, the field switch 53 is provided in parallel with the field switch 51, and the field switch 54 is provided in parallel with the field switch 52. In the following, for convenience of explanation, the field switches 51 to 54 are also referred to as a first switch 51, a second switch 52, a third switch 53, and a fourth switch 54, respectively.

  The field winding 26 is provided in a path portion that connects an intermediate point between the field switches 51 and 52 and an intermediate point between the field switches 53 and 54. Speaking on the basis of the second switch 52, the field winding 26 is connected to both ends of the second switch 52 and is provided in a parallel path section that is in parallel with the second switch 52. One of both ends of the field winding 26 is connected to an F + terminal that is an intermediate point between the field switches 51 and 52, and the other is connected to an F− terminal that is an intermediate point between the field switches 53 and 54. The F + terminal is a power supply side terminal (high side terminal), and the F− terminal is a ground side terminal (low side terminal). The field winding 26 is connected to the F + terminal and the F− terminal via a brush (not shown).

  The cutoff switch 50 is provided between the power supply unit and the first switch 51, more specifically, between the bus connected to the battery unit U and the branch point of the first switch 51 and the third switch 53. The power supply to the field circuit 23 and the power cutoff are switched by turning on and off the cutoff switch 50.

  When the field winding 26 is energized by the field circuit 23, the switches 50 to 54 are turned on and off as follows. FIG. 3 shows an energization path in the field circuit 23. When the field winding 26 is energized due to the operation of the rotating electrical machine 21, the cutoff switch 50 is always on (fixed on), the third switch 53 is always off (fixed off), and the fourth switch 54 is always on ( On-fixed). In this state, the first switch 51 and the second switch 52 are turned on and off in a conflicting period. In this case, when the first switch 51 is turned on and the second switch 52 is turned off, as shown by a broken line in FIG. 3, the cutoff switch 50 → the first switch 51 → the field winding 26 → the fourth switch 54 → A current flows through the path Y1 in the order of the ground. Thereafter, when the first switch 51 is turned off and the second switch 52 is turned on, the field winding 26 → the fourth switch 54 → the second switch 52 → the field as shown by a two-dot chain line in FIG. A current (reflux current) flows through the return path Y2 in the order of the magnetic winding 26.

  Here, a field current detector 55 that detects a field current If flowing through the field winding 26 is provided on the ground side of the electric path at both ends of the fourth switch 54. In addition, on the ground side of the electrical path at both ends of the second switch 52, a return current detection unit 56 that detects the return current Ir that flows while the first switch 51 is off and the second switch 52 is on is provided. ing. If the direction from the power supply side to the ground is positive, the field current If is detected as a positive current, and the return current Ir is detected as a negative current. The current detection units 55 and 56 have a configuration including, for example, a shunt resistor and a current transformer.

  Returning to FIG. 2, a voltage sensor 45 that detects an input / output voltage (that is, a power supply voltage) of the inverter 22 is provided on the high-voltage side path of the inverter 22. The rotary electric machine 21 is provided with a temperature sensor 46 that detects, for example, the temperature of the stator as the temperature of the rotary electric machine 21. The temperature sensor 46 may detect the temperature of the semiconductor switching element. The detection signals of each sensor including these are appropriately input to the rotating electrical machine ECU 24.

  Each switch constituting the inverter 22 and the field circuit 23 is independently switched on / off via a driver 27.

  The rotating electrical machine ECU 24 is configured by a microcomputer including a CPU, a ROM, a RAM, an input / output interface, and the like. The rotating electrical machine ECU 24 adjusts the excitation current flowing through the field winding 26 by an IC regulator (not shown) inside. Thereby, the power generation voltage (output voltage with respect to the battery unit U) of the rotating electrical machine unit 16 is controlled. The rotating electrical machine ECU 24 controls on / off of the switches Sp and Sn of each phase according to the energization phase, and controls the energization current by adjusting the on / off ratio (for example, duty ratio) when energizing each phase. Here, the rotating electrical machine ECU 24 assists the driving force of the engine by controlling the inverter 22 to drive the rotating electrical machine 21 after the vehicle starts running. The rotating electrical machine 21 can apply initial rotation to the crankshaft when starting the engine, and also has a function as an engine starting device.

  It supplements about the field current control by rotary electric machine ECU24. The rotating electrical machine ECU 24 calculates a target field current based on the power running torque command value and the generated voltage command value from the engine ECU 40 which is the host controller, and the target field current and the actual field current (field current). The duty ratio of the control duty signal is calculated based on the deviation from the detected current value of the detection unit 55. Then, the first switch 51 and the second switch 52 are turned on and off by the control duty signal. Thereby, the field current is feedback controlled.

  Next, an abnormality diagnosis process performed in the present system and a fail safe process performed according to the abnormality diagnosis contents will be described. As an outline of the processing, the rotating electrical machine ECU 24 obtains a current detection value of the energization current flowing through the field circuit 23, and performs an abnormality diagnosis of the field circuit 23 based on the control duty signal and the current detection value. . Further, when it is diagnosed that an abnormality has occurred in the field circuit 23, a predetermined fail-safe process is performed.

  In the present embodiment, the field circuit 23 diagnoses abnormalities of the following forms, which will be described.

(Abnormality 1) Correlation deviation abnormality on the duty increasing side In the field circuit 23, for example, when an element failure that prevents the first switch 51 or the fourth switch 54 from being fully turned on or an increase in the contact resistance of the brush due to wear occurs, The path resistance of the field circuit 23 increases unintentionally. In this case, in the correlation between the duty ratio of the control duty signal and the field current, a correlation shift occurs when the actual duty ratio deviates from the predetermined normal range. An abnormality diagnosis of the magnetic circuit 23 is performed.

  FIG. 4 is a diagram showing the correlation between the duty ratio of the control duty signal and the field current corresponding to the duty ratio. The duty ratio and the field current are basically in a relationship indicated by a solid line in FIG. 4, and the field current increases proportionally as the duty ratio increases. Further, when the field current is feedback-controlled, the duty ratio increases proportionally as the field current (actual current) increases. In such a case, when an abnormality occurs in which the path resistance of the field circuit 23 increases, the correlation between the duty ratio and the field current changes as indicated by a broken line A1. An abnormality diagnosis of the field circuit 23 is performed based on this correlation shift.

(Abnormality 2) Correlation deviation abnormality on the duty decreasing side In the field circuit 23, for example, when a short circuit occurs in the middle part of the field winding 26 (intermediate short circuit occurs), the path of the field circuit 23 is caused thereby. Resistance is unintentionally reduced. In this case, in the correlation between the duty ratio of the control duty signal and the field current, a correlation shift occurs when the actual duty ratio deviates from the predetermined normal range. Therefore, the field shift is based on the correlation shift. An abnormality diagnosis of the magnetic circuit 23 is performed.

  In FIG. 4, when an abnormality occurs in which the path resistance of the field circuit 23 decreases, the correlation between the duty ratio and the field current changes as indicated by a two-dot chain line A2. An abnormality diagnosis of the field circuit 23 is performed based on this correlation shift.

(Abnormality 3) Off failure of the first switch 51 When the off failure (open failure) of the first switch 51 occurs in the field circuit 23, the field is generated even if the duty ratio of the control duty signal is increased due to this. Current does not flow or decreases. In this case, an abnormality diagnosis of the field circuit 23 is performed by monitoring a change in the field current detection value (If) when the duty ratio increases.

  In addition to the off failure (open failure) of the first switch 51, the off failure (open failure) of the fourth switch 54, the disconnection of the field winding 26, or the disconnection of the commutator of the field winding 26 occurs. In addition, as described above, it is conceivable that the field current does not flow or decreases when the duty ratio increases. Even in such a case, the abnormality of the field circuit 23 can be diagnosed by monitoring the change in the detected field current when the duty ratio increases.

(Abnormality 4) Off-fault of the first switch 51 In the field circuit 23, when an off-fault (open fault) of the first switch 51 occurs in a state where a field current flows through the field winding 26, the first switch 51 Although the switch 51 is on and the second switch 52 is off, the return current (second switch 52) is supplied to the return current detection unit 56 via the diode Di provided in antiparallel to the second switch 52. Current flows in the direction from the ground side to the power supply side. In this case, the abnormality diagnosis of the field circuit 23 is performed by monitoring the return current detection value (Ir) when the first switch 51 is turned on and the second switch 52 is turned off by the control duty signal.

(Abnormality 5) On failure of the first switch 51 When an on failure (closed failure) of the first switch 51 occurs in the field circuit 23, the power supply unit side and the field winding 26 are connected via the first switch 51. As a result, the excess current continues to flow in the field winding 26. Further, the reflux of the field current (energization in the direction from the ground side to the power supply unit side through the second switch 52) does not occur. In this case, even if the duty ratio of the control duty signal decreases, the field current detection value (If) does not decrease and changes, and the return current detection value (Ir) in the direction from the ground side to the power supply side through the second switch 52. ) Remains below a predetermined value, an abnormality diagnosis of the field circuit 23 is performed.

(Abnormality 6) Off failure of the second switch 52 When the off failure (open failure) of the second switch 52 occurs in the field circuit 23, the return current stops flowing, so the first switch 51 and the second switch 52 are turned on / off. The amount of fluctuation (current ripple) of the energizing current accompanying the increase. Further, when the duty ratio of the control duty signal is calculated based on the target field current and the detected field current value, the amount of fluctuation in the duty ratio increases due to the fluctuation in the field current. In this case, based on the fluctuation amount of the field current detection value (If) within a predetermined time being greater than or equal to a predetermined amount, or the fluctuation amount of the duty ratio within the predetermined time being greater than or equal to a predetermined amount, Carry out abnormality diagnosis.

  In addition to the OFF failure (open failure) of the second switch, if a short circuit occurs in the middle portion of the field winding (intermediate short circuit occurs), the path resistance of the field circuit 23 unintentionally decreases, As a result, it is conceivable that the variation amount of the duty ratio becomes large. In this case, abnormality diagnosis may be performed based on the fluctuation amount of the field current detection value and the fluctuation amount of the duty ratio as described above.

(Abnormality 7) On failure of the second switch 52 In the field circuit 23, when an on failure (closed failure) of the second switch 52 occurs, the first switch 51 and the second switch Excessive current flows through the switch 52 (through current in the direction from the power supply unit side to the ground side through the second switch 52). In this case, the abnormality diagnosis of the field circuit 23 is performed by monitoring the return current detection value (Ir) when the first switch 51 is turned on and the second switch 52 is turned off by the control duty signal.

(Abnormality 8) On failure of third switch 53 In the field circuit 23, when an on failure (closed failure) of the third switch 53 occurs, the fourth switch 54 is always on. An excessive current (through current) flows through the fourth switch 54. In this case, an abnormality diagnosis of the field circuit 23 is performed by determining whether or not a predetermined current or more has flowed through the series path of the third switch 53 and the fourth switch 54 by using the field current detection value (If). .

(Abnormality 9) F-terminal ground fault In the field circuit 23, when a ground short occurs at the F-terminal (low-side terminal) of the field winding 26, the field between the power supply unit and the ground Although energization of the magnetic winding 26 and subsequent recirculation of the energization current (energization in the direction from the ground side to the power supply unit through the second switch 52) occurs, current detection by the field current detection unit 55 cannot be performed. In this case, even if the duty ratio is increased, the field current detection value (If) is zero and the return current detection value (Ir) is greater than or equal to a predetermined value, so that an abnormality diagnosis of the field circuit 23 is performed.

(Abnormal 10) F + terminal power supply fault In the field circuit 23, when a power supply short circuit (power supply fault) occurs at the F + terminal (high side terminal) of the field winding 26, the power supply unit and the field winding 26 The connection is always established, and an excessive current continuously flows through the field winding 26. In this case, an abnormality diagnosis of the field circuit 23 is performed by monitoring a change in the field current detection value (If) when the duty ratio of the control duty signal becomes small.

  Even when a power supply short circuit occurs at the F-terminal (low side terminal) of the field winding 26, an excessive current continuously flows regardless of the control duty signal. Therefore, the abnormality diagnosis of the field circuit 23 is performed by monitoring the change of the field current detection value (If) when the duty ratio of the control duty signal becomes small.

  Next, the fail-safe process corresponding to each abnormality will be described.

(Fail safe 1)
When it is determined that the above abnormality 1, that is, the correlation deviation abnormality on the duty increasing side, or the above abnormality 2, that is, the correlation deviation abnormality on the duty decreasing side has occurred, Add a limit to the flowing field current.

  If energization of the field winding 26 is performed as usual in the case where the correlation deviation abnormality on the duty increase side has occurred, there is a concern that the amount of heat generated in the field circuit 23 increases. In this respect, heat generation in the field circuit 23 is suppressed by adding a limit to the field current as fail-safe processing.

  Further, if the field winding 26 is energized as usual when an abnormality of the correlation deviation on the duty decreasing side occurs, there is a concern that the energizing current of the field circuit 23 may increase unintentionally. In this regard, the field current is appropriately controlled by adding a limit to the field current as fail-safe processing.

(Fail safe 2)
When it is determined that the above-described abnormality 3, that is, the first switch 51 has an off-failure, the control is performed in a state where the first switch 51 is always off and the second switch 52 is always on as a fail-safe process. By the duty signal, the third switch 53 and the fourth switch 54 are alternately turned on and off to perform reverse excitation of the field winding 26.

  According to the above configuration, when the field current does not flow or decreases even when the duty ratio of the control duty signal is increased due to the OFF failure of the first switch 51, the first switch 51 and the second switch 52 are used. The field current is controlled by performing reverse excitation by switching the above control and the control of the third switch 53 and the fourth switch 54. As a result, the field current control is continuously performed after the first switch 51 is turned off.

  In this fail-safe process (fail-safe 2), reverse excitation may be performed with the current phase of the armature winding 25 in the inverter 22 shifted by 180 degrees. Thereby, the rotational state of the rotating electrical machine 21 is kept good even after the fail-safe process is performed.

  In addition, after the determination that the abnormality has occurred, reverse excitation may be started after a lapse of a predetermined time having a time width in which the field current flowing through the field winding 26 is once zero. When reverse excitation of the field winding 26 is performed, the direction of the energization current in the field winding 26 is opposite to that of normal excitation. At this point, when it is determined that an abnormality has occurred, the transition from normal excitation to reverse excitation is started by starting reverse excitation after a lapse of a predetermined time having a time width at which the field current temporarily becomes zero. Can be implemented properly.

  Even when it is determined that the first switch 51 has an off-failure as the abnormality 4, the fail-safe process (fail-safe 2) by reverse excitation of the field winding 26 is performed as described above. Good.

(Fail safe 3)
When it is determined that the above abnormality 5, that is, an on failure of the first switch 51 has occurred, as a fail safe process, instead of alternately turning on and off the first switch 51 and the second switch 52, a cutoff switch 50 and the second switch 52 are alternately turned on and off. This makes it possible to perform field current control equivalent to that before the occurrence of an ON failure of the first switch 51.

(Failsafe 4)
When it is determined that the abnormality 6 described above, that is, an OFF failure of the second switch 52 has occurred, a limit is added to the field current flowing through the field winding 26 as fail-safe processing. In this case, inconveniences such as an unstable operation of the rotating electrical machine 21 due to an increase in the fluctuation amount of the field current (current ripple) or an increase in the fluctuation amount of the duty ratio are suppressed.

  In addition, since the diode Di is connected to the second switch 52 in antiparallel, it is considered that the return current flows through the diode Di even if the second switch 52 has an off failure. In this regard, by limiting the field current, the current flowing through the diode Di is limited, and the diode Di is protected.

(Failsafe 5)
When it is determined that the above abnormality 7, that is, the on failure of the second switch 52 has occurred, the control is performed in a state where the first switch 51 is always off and the second switch 52 is always on as fail-safe processing. By the duty signal, the third switch 53 and the fourth switch 54 are alternately turned on and off to perform reverse excitation of the field winding 26.

  In the fail safe 5, similarly to the fail safe 2, reverse excitation may be performed in a state where the current phase of the armature winding 25 in the inverter 22 is shifted by 180 degrees. In addition, after the determination that an abnormality has occurred, reverse excitation may be started at least after a lapse of a predetermined time having a time width in which the field current flowing through the field winding 26 is once zero.

(Fail Safe 6)
When it is determined that the abnormality 7 described above, that is, the on failure of the second switch 52 has occurred, the fail safe 6 can be implemented instead of the fail safe 5. In the fail-safe process, the cutoff switch 50 is set in a cutoff state.

  In this fail-safe process (fail-safe 6), it is preferable to turn off all the field switches 51 to 54 after the shut-off switch 50 is turned off and the return current flowing through the field winding 26 becomes zero. For example, the field switches 51 to 54 are all turned off after the return current detection value (Ir) reaches zero. As a result, the path is interrupted in a state where a large current is still flowing through the energization path including the field winding 26, and the problem that the switch is surge-damaged due to this is suppressed.

(Failsafe 7)
When it is determined that the above abnormality 8, that is, the on failure of the third switch 53 has occurred, the control is performed in a state where the first switch 51 is always off and the second switch 52 is always on as a fail-safe process. In response to the duty signal, the cutoff switch 50 and the fourth switch 54 are alternately turned on and off to perform reverse excitation of the field winding 26.

  According to the above configuration, when an on failure occurs in the third switch 53, the on / off control of the cutoff switch 50 and the fourth switch 54 is performed instead of the on / off control of the first switch 51 and the second switch 52. The field current control is continuously performed.

  In the fail safe 7, similarly to the fail safe 2, the reverse excitation may be performed in a state where the current phase of the armature winding 25 in the inverter 22 is shifted by 180 degrees. In addition, after the determination that an abnormality has occurred, reverse excitation may be started at least after a lapse of a predetermined time having a time width in which the field current flowing through the field winding 26 is once zero.

(Failsafe 8)
When it is determined that the abnormality 8 described above, that is, the on failure of the third switch 53 has occurred, the fail safe 8 can be implemented instead of the fail safe 7. In the fail-safe process, the cutoff switch 50 is set in a cutoff state.

  In this fail safe process (fail safe 8), it is preferable to turn off all the field switches 51 to 54 after the cutoff switch 50 is turned off and the field current flowing through the field winding 26 becomes zero. For example, all the field switches 51 to 54 are turned off after waiting for the field current detection value (If) to become zero. As a result, the path is interrupted in a state where a large current is still flowing through the energization path including the field winding 26, and the problem that the switch is surge-damaged due to this is suppressed.

(Fail Safe 9)
When it is determined that the above-described abnormality 9, that is, a ground fault of the F-terminal has occurred, the first switch 51 is turned off as fail-safe processing.

(Failsafe 10)
When it is determined that the abnormality 10 described above, that is, the F + terminal power fault has occurred, the second switch 52 is turned off as fail-safe processing.

  Next, the abnormality diagnosis process and the fail safe process performed by the rotating electrical machine ECU 24 will be described with reference to the flowchart of FIG. This process is repeatedly performed by the rotating electrical machine ECU 24 at a predetermined cycle.

  In FIG. 5, in step S <b> 11, it is determined as abnormality 1 whether a correlation deviation abnormality on the duty increasing side has occurred. Further, in step S12, it is determined whether or not the abnormality of correlation deviation on the duty decreasing side has occurred as abnormality 2. In steps S11 and S12, for example, the normal range of the duty ratio is determined according to the field current in the correlation of FIG. 4, and the abnormality determination value including the boundary value (upper limit value and lower limit value) of the normal range is set as the current duty ratio. To determine whether or not there is a correlation error. The abnormality determination value may be variably determined according to the power supply voltage and the temperature of the rotating electrical machine 21. For example, the abnormality determination value Dth is determined based on the relationship of FIG.

  And when either of step S11, S12 is affirmed, it will progress to step S21 and will implement fail safe 1. FIG. In step S21, a restriction is applied to the field current flowing through the field winding 26. When the upper limit value of the field current If is determined as the current limit, the upper limit value may be a fixed value or may be variable according to the amount of correlation shift. For example, the upper limit value of the current limit is decreased (the limit is increased) as the correlation shift amount (duty ratio shift amount with respect to the normal range) increases. Alternatively, the width of the current limit may be variable according to the target field current (for example, the upper limit value of the current limit is increased as the target current is increased).

  In step S13, it is determined whether or not the first switch 51 has an off failure as an abnormality 3. At this time, if the field current detection value (If) remains zero even if the duty ratio of the control duty signal becomes large, or if the field current detection value (If) changes to decrease, an abnormality occurs. Judgment is made.

  Further, in step S14, it is determined whether or not there is an off failure of the first switch 51 as abnormality 4. At this time, under the state where the first switch 51 is turned on and the second switch 52 is turned off by the control duty signal, the return current detection value is greater than or equal to a predetermined value (−Ir ≧ Ith1) in the direction from the ground side to the power supply unit side. If it is, it is determined that an abnormality has occurred. Note that “−Ir” indicates that the return current flows in the direction from the ground side to the power supply unit side. Steps S13 and S14 both determine an off failure of the first switch 51, and may be configured to implement only one of them.

  And when either of step S13, S14 is affirmed, it will progress to step S22 and will implement the fail safe 2. FIG. In step S22, the third switch 53 and the fourth switch 54 are alternately turned on and off by the control duty signal in a state where the first switch 51 is always off and the second switch 52 is always on. Perform reverse excitation.

  In step S <b> 15, it is determined whether or not an ON failure of the first switch 51 has occurred as an abnormality 5. At this time, the field current detection value (If) does not decrease even when the duty ratio of the control duty signal decreases, and the return current detection value is less than or equal to a predetermined value (−Ir ≦≦ I) in the direction from the ground side to the power supply unit side. If it remains Ith2), it is determined that an abnormality has occurred.

  And if step S15 is affirmed, it will progress to step S23 and will implement the fail safe 3. FIG. In step S23, instead of alternately turning on and off the first switch 51 and the second switch 52, the cutoff switch 50 and the second switch 52 are alternately turned on and off.

  In step S <b> 16, it is determined whether there is an off failure of the second switch 52 as abnormality 6. At this time, when the fluctuation amount of the field current detection value (If) within a predetermined time becomes equal to or greater than a predetermined value, or when the fluctuation amount of the duty ratio within a predetermined time becomes equal to or greater than a predetermined value, it is determined that abnormality has occurred. . The predetermined time may be a time corresponding to the cycle of the control duty signal (for example, carrier cycle). Alternatively, the predetermined time may be a cycle correlated with the rotation of the rotating electrical machine 21.

  And if step S16 is affirmed, it will progress to step S24 and will implement the fail safe 4. FIG. In step S23, the field current flowing through the field winding 26 is limited. The upper limit value of the current limit may be a fixed value or may be variable according to the target field current (for example, the upper limit value of the current limit is increased as the target current is larger).

  In step S <b> 17, it is determined whether or not an ON failure of the second switch 52 has occurred as abnormality 7. At this time, when the first switch 51 is turned on by the control duty signal and the second switch 52 is turned off, the return current detection value becomes equal to or greater than a predetermined value (Ir ≧ Ith3) in the direction from the power supply unit side to the ground side. If so, it is determined that an abnormality has occurred.

  And if step S17 is affirmed, it will progress to step S25 and will implement the fail safe 5. FIG. In step S25, the third switch 53 and the fourth switch 54 are alternately turned on and off by the control duty signal in a state where the first switch 51 is always off and the second switch 52 is always on. Perform reverse excitation.

  In step S25, the fail safe 6 may be implemented instead of the fail safe 5. In this case, the cut-off switch 50 is put into a cut-off state as fail-safe processing.

  In step S18, it is determined whether or not an ON failure of the third switch 53 has occurred as an abnormality 8. At this time, when a current greater than or equal to a predetermined value flows through the series path of the third switch 53 and the fourth switch 54, that is, when the field current detection value (If) exceeds a predetermined value, it is determined that an abnormality has occurred.

  And if step S18 is affirmed, it will progress to step S26 and will implement the fail safe 7. FIG. In step S26, in the state where the first switch 51 is always off and the second switch 52 is always on, the cutoff switch 50 and the fourth switch 54 are alternately turned on and off by the control duty signal to reverse the field winding 26. Perform excitation.

  In step S26, fail safe 8 may be implemented instead of fail safe 7. In this case, the cut-off switch 50 is put into a cut-off state as fail-safe processing.

  In step S19, it is determined whether or not an F9 terminal ground fault has occurred as an abnormality 9. At this time, the field current detection value (If) is zero even when the duty ratio increases, and the return current detection value is greater than or equal to a predetermined value (−Ir ≧ Ith1) in the direction from the ground side to the power supply unit side. Next, it is determined that an abnormality has occurred. And if step S19 is affirmed, it will progress to step S27 and will turn off the 1st switch 51 as the fail safe 9. FIG.

  In step S20, it is determined whether or not the F + terminal power fault has occurred as an abnormality 10. At this time, if the field current detection value (If) does not decrease and change even when the duty ratio of the control duty signal decreases, it is determined that an abnormality has occurred. When step S20 is affirmed, the process proceeds to step S28, and the second switch 52 is turned off as the fail safe 10. In steps S21 to S28, diagnostic information representing the occurrence of abnormality for each form of abnormality may be stored in the memory.

  According to the above-described configuration of the present embodiment described in detail above, the field circuit 23 is properly diagnosed for abnormality by the control duty signal and the current detection value, and fail-safe processing is performed based on the result of the abnormality diagnosis. Implemented properly. By taking into consideration that the current flows through the field circuit 23 in accordance with the control duty signal, the abnormality diagnosis of the field circuit 23 can be properly performed. As a result, the abnormality of the rotating electrical machine 21 can be properly grasped, and consequently the rotating electrical machine 21 can be appropriately driven.

  In addition, since various abnormalities in the field circuit 23 are assumed and a diagnosis method is set according to the abnormalities, it is possible to appropriately cope with various abnormalities that may occur when the rotating electrical machine 21 is used.

(Other embodiments)
You may change the said embodiment as follows, for example.

  In addition to the above, the following processing may be performed as abnormality diagnosis processing and fail-safe processing. In the field circuit 23 having the H-bridge configuration, even if the second switch 52 or the third switch 53 is turned off, the field winding 26 is continuously energized. That is, even if either of the second and third switches 52 and 53 is turned off, the field current is detected within the normal range. Therefore, it may be difficult to determine the off failure of the second and third switches 52 and 53. Therefore, the rotating electrical machine ECU 24 performs reverse excitation by turning on and off the third switch 53 and the fourth switch 54 instead of turning on and off the first switch 51 and the second switch 52, and performs the reverse excitation. An abnormality diagnosis of the field circuit 23 is performed by monitoring a change in the current detection value in a state where the current is detected. The abnormality diagnosis process by the rotating electrical machine ECU 24 is shown in FIG.

  In FIG. 7, in step S31, it is determined whether or not the ignition switch is immediately after being turned on. If YES, the field winding 26 is reversely excited in step S32. At this time, the third switch 53 and the fourth switch 54 may be turned on / off with a predetermined duty ratio. Thereafter, in step S33, a current detection value (field current detection value, return current detection value) is acquired in a state where reverse excitation is being performed. In subsequent step S34, based on the current detection value, the second switch 52 is obtained. It is determined whether or not the third switch 53 is operating normally. In a state where reverse excitation is performed, the second switch 52 corresponds to the fourth switch 54 in the case of normal excitation, and the third switch 53 corresponds to the first switch 51 in the case of normal excitation. Therefore, among the above-described abnormality diagnosis methods, the abnormality diagnosis method related to abnormality 3 or the abnormality diagnosis method related to abnormality 4 can be used to determine whether the second switch 52 is off or the third switch 53 is off. . Note that when performing abnormality diagnosis relating to abnormality 3, it is preferable to intentionally increase the duty ratio of the control duty signal and acquire the current detection value at that time.

  If no off failure has occurred in the second switch 52 or the third switch 53, it is determined in step S35 that it is normal. If an off failure has occurred in the second switch 52 or the third switch 53, a step is performed. In S36, it is determined that there is an abnormality.

  When the OFF failure of the second switch 52 is determined, the cutoff switch 50 is put into a cutoff state as a fail safe process. If an off-failure is determined by the third switch 53, nothing is performed as the fail-safe process, and only the diagnosis information indicating the occurrence of abnormality is stored. The abnormality diagnosis in FIG. 7 may be performed when the rotating electrical machine 21 is not in operation, and may be performed immediately after the ignition switch is turned off.

  In the above embodiment, the field circuit 23 is configured with an H-bridge circuit, but the field circuit 23 may be configured with a half-bridge circuit instead. FIG. 8 shows a field circuit 23 having a half-bridge circuit configuration. In the field circuit 23 of FIG. 8, the first switch 51 and the second switch 52 are connected in series between the power supply unit and the ground, and the field winding 26 is connected to the parallel path unit in parallel with the second switch 52. Is provided. Also in this configuration, the first switch 51 and the second switch 52 are on / off controlled in a conflicting period, and abnormality diagnosis using the above-described abnormality diagnosis method is appropriately performed.

  In the above embodiment, the cutoff switch 50 is provided on the high side of the first switch 51. However, the present invention is not limited to this, and the low side of the second switch 52 (more specifically, the bus connected to the ground and the second switch 52 and The cutoff switch 50 may be provided between the branch point of the fourth switch 54).

  In the above-described embodiment, the case where a three-phase AC motor is used as the rotating electrical machine 21 has been described. However, the rotating electric machine 21 may be applied to other than a three-phase AC motor such as a six-phase AC motor.

  In the above embodiment, the rotating electrical machine that performs the power generation operation and the power running operation has been described. However, the present invention can also be applied to a rotating electrical machine that performs only the power generation operation or the power running operation.

  -The power supply system to which this invention is applied can also be used for uses other than a vehicle, for example, a ship, an aircraft, a robot, etc.

  -Each said component is conceptual and is not limited to the said embodiment. For example, the functions of one component may be realized by being distributed to a plurality of components, or the functions of a plurality of components may be realized by one component.

  DESCRIPTION OF SYMBOLS 11 ... Lead storage battery, 12 ... Lithium ion storage battery, 16 ... Rotary electric machine unit, 21 ... Rotary electric machine, 25 ... Armature winding, 26 ... Field winding, 51 ... 1st switch, 52 ... 2nd switch, 24 ... Rotating electrical machine ECU.

Claims (26)

A rotating electrical machine (21) having an armature winding (25) and a field winding (26), and a plurality of switching elements (51 to 55), and the field windings depending on on / off of the switching elements. A rotating electrical machine control device (24) applied to a rotating electrical machine unit (16) comprising a field circuit (23) to be energized,
The field circuit includes, as the plurality of switching elements, a first switching element (51) and a second switching element (52) connected in series between a power supply unit (11, 12) and a ground. Among these switching elements, the field winding is provided in a parallel path portion connected to both ends of the second switching element on the ground side and in parallel with the second switching element, and the switching elements conflict with each other. Each is turned on and off by a duty signal so that it is turned on in a period,
An acquisition unit that acquires a current detection value for an energization current flowing through the field circuit;
An abnormality diagnosis unit that performs abnormality diagnosis of the field circuit based on the duty signal and the current detection value;
A fail-safe processing unit that performs a predetermined fail-safe process when an abnormality occurrence is diagnosed by the abnormality diagnosis unit;
A rotating electrical machine control device comprising: A rotating electrical machine control device that calculates a duty ratio of the duty signal based on a target energization current and the detected current value,
In the correlation between the duty ratio and the energization current of the field circuit corresponding to the duty ratio, the abnormality diagnosis unit increases the duty ratio with respect to a predetermined normal range corresponding to the detected current value. The rotating electrical machine control device according to claim 1, wherein the abnormality diagnosis is performed by determining whether or not a correlation deviation that deviates from the above occurs. A rotating electrical machine control device that calculates a duty ratio of the duty signal based on a target energization current and the detected current value,
In the correlation between the duty ratio and the energization current of the field circuit corresponding to the duty ratio, the abnormality diagnosis unit is configured such that the duty ratio becomes smaller than a predetermined normal range corresponding to the current detection value. 3. The rotating electrical machine control device according to claim 1, wherein the abnormality diagnosis is performed by determining whether or not a correlation deviation that deviates from the above occurs.   The fail-safe processing unit adds a limit to the energization current flowing through the field winding as the fail-safe processing when the abnormality diagnosis unit determines that the correlation shift has occurred. The rotating electrical machine control device described.   The abnormality diagnosis unit determines whether the current detection value remains zero when the duty ratio of the duty signal increases, or determines whether the current detection value decreases or not. The rotating electrical machine control apparatus according to any one of claims 1 to 4, wherein diagnosis is performed. In addition to the first switching element and the second switching element, the field circuit includes a third switching element (53) provided in parallel with the first switching element, and the second switching element as the plurality of switching elements. A fourth switching element (54) provided in parallel with the element, each of these switching elements is provided connected in an H-bridge shape,
In the state where the third switching element is always off and the fourth switching element is always on, the field winding is obtained by alternately turning on and off the first switching element and the second switching element by the duty signal. A rotating electrical machine control device for controlling the energization current of
The fail safe processing unit, when it is determined by the abnormality diagnosis unit that the current detection value remains zero or the current detection value decreases when the duty ratio of the duty signal increases, As a fail-safe process, the third switching element and the fourth switching element are alternately turned on / off by the duty signal in a state where the first switching element is always off and the second switching element is always on. The rotating electrical machine control device according to claim 5, wherein reverse excitation of the field winding is performed. A diode (Di) is connected in parallel to the second switching element in a direction allowing a current flow from the ground side to the power supply unit side,
In the field circuit, a return current flowing in a state where the first switching element is turned off and the second switching element is turned on is detected in a ground-side electric path among electric paths at both ends of the second switching element. A reflux current detector (56) is provided,
The acquisition unit acquires the return current detection value detected by the return current detection unit,
The abnormality diagnosing unit is configured such that the reflux current is directed from the ground side to the power supply unit side through the second switching element in a state where the first switching element is turned on and the second switching element is turned off by the duty signal. The rotating electrical machine control device according to any one of claims 1 to 6, wherein the abnormality diagnosis is performed by determining whether or not a detected value is equal to or greater than a predetermined value. In addition to the first switching element and the second switching element, the field circuit includes a third switching element (53) provided in parallel with the first switching element, and the second switching element as the plurality of switching elements. A fourth switching element (54) provided in parallel with the element, each of these switching elements is provided connected in an H-bridge shape,
In the state where the third switching element is always off and the fourth switching element is always on, the field winding is obtained by alternately turning on and off the first switching element and the second switching element by the duty signal. A rotating electrical machine control device for controlling the energization current of
The fail-safe processing unit is configured such that the abnormality diagnosis unit causes the first switching element to be turned on and the second switching element to be turned off by the duty signal, and from the ground side to the power supply unit side through the second switching element. When it is determined that the detected value of the return current in the direction to the predetermined value is equal to or greater than a predetermined value, the fail-safe process is performed in a state in which the first switching element is always off and the second switching element is always on. 8. The rotating electrical machine control device according to claim 7, wherein the third switching element and the fourth switching element are alternately turned on / off by a duty signal to cause reverse excitation of the field winding. In the field circuit, the parallel path section includes a field magnet for detecting a field current flowing through the field winding between the field winding and the ground-side end of the second switching element. A current detection unit (55) is provided, and among the electrical paths at both ends of the second switching element, the ground-side electrical path has a state where the first switching element is off and the second switching element is on. A reflux current detector (56) for detecting the flowing reflux current is provided,
The acquisition unit acquires the field current detection value detected by the field current detection unit, and acquires the return current detection value detected by the return current detection unit,
The abnormality diagnosis unit detects the return current in a direction from the ground side to the power supply unit side through the second switching element, even if the duty ratio of the duty signal becomes small. The rotating electrical machine control device according to any one of claims 1 to 8, wherein the abnormality diagnosis is performed based on a value remaining below a predetermined value. The field circuit has a cut-off switch (50) between the power supply unit and the first switching element for conducting or blocking between the power supply unit and the first switching element,
The fail safe processing unit determines that the field current detection value does not decrease and the return current detection value is zero even when the duty ratio of the duty signal decreases by the abnormality diagnosis unit. In this case, as the fail-safe process, the cutoff switch and the second switching element are alternately turned on and off instead of alternately turning on and off the first switching element and the second switching element. Rotating electrical machine control device.   The abnormality diagnosis unit determines whether the fluctuation amount of the current detection value within a predetermined time is equal to or greater than a predetermined value, or whether the fluctuation amount of the duty ratio of the duty signal within a predetermined time is equal to or greater than a predetermined value. The rotating electrical machine control device according to any one of claims 1 to 10, wherein the abnormality diagnosis is performed based on the determination.   The fail-safe processing unit is configured such that when the abnormality diagnosis unit determines that the variation amount of the current detection value within a predetermined time is greater than or equal to a predetermined amount, or the variation amount of the duty ratio within a predetermined time is greater than or equal to a predetermined amount The rotating electrical machine control device according to claim 11, wherein when it is determined that there is a limit, a restriction is applied to an energization current flowing through the field winding as the fail-safe process. In the field circuit, a return current flowing in a state where the first switching element is turned off and the second switching element is turned on is detected in a ground-side electric path among electric paths at both ends of the second switching element. A reflux current detector (56) is provided,
The acquisition unit acquires the return current detection value detected by the return current detection unit,
The abnormality diagnosing unit is configured such that the return current is directed from the power supply unit side to the ground side through the second switching element in a state where the first switching element is turned on and the second switching element is turned off by the duty signal. The rotating electrical machine control device according to any one of claims 1 to 12, wherein the abnormality diagnosis is performed by determining whether or not a detected value is equal to or greater than a predetermined value. In addition to the first switching element and the second switching element, the field circuit includes a third switching element (53) provided in parallel with the first switching element, and the second switching element as the plurality of switching elements. A fourth switching element (54) provided in parallel with the element, each of these switching elements is provided connected in an H-bridge shape,
In the state where the third switching element is always off and the fourth switching element is always on, the field winding is obtained by alternately turning on and off the first switching element and the second switching element by the duty signal. A rotating electrical machine control device for controlling the energization current of
The fail safe processing unit is configured such that the abnormality diagnosis unit causes the first switching element to be turned on and the second switching element to be turned off by the duty signal, and from the power supply unit side to the ground side through the second switching element. When it is determined that the detected value of the return current in the direction to the predetermined value is equal to or greater than a predetermined value, the fail-safe process is performed in a state in which the first switching element is always off and the second switching element is always on. The rotating electrical machine control device according to claim 13, wherein the third switching element and the fourth switching element are alternately turned on / off by a duty signal to cause reverse excitation of the field winding. The field circuit has a cut-off switch (50) between the power supply unit and the first switching element for conducting or blocking between the power supply unit and the first switching element,
The fail safe processing unit is configured such that the abnormality diagnosis unit causes the first switching element to be turned on and the second switching element to be turned off by the duty signal, and from the power supply unit side to the ground side through the second switching element. The rotating electrical machine control device according to claim 13, wherein, when it is determined that the detected value of the return current in the direction toward is greater than or equal to a predetermined value, the cutoff switch is set to a cutoff state as the failsafe process. In addition to the first switching element and the second switching element, the field circuit includes a third switching element (53) provided in parallel with the first switching element, and the second switching element as the plurality of switching elements. A fourth switching element (54) provided in parallel with the element, each of these switching elements is provided connected in an H-bridge shape,
In the state where the third switching element is always off and the fourth switching element is always on, the field winding is obtained by alternately turning on and off the first switching element and the second switching element by the duty signal. A rotating electrical machine control device for controlling the energization current of
16. The abnormality diagnosis unit according to claim 1, wherein the abnormality diagnosis unit performs the abnormality diagnosis by determining whether or not a predetermined current or more has flowed through a series path of the third switching element and the fourth switching element. The rotating electrical machine control device according to item 1. The field circuit has a cut-off switch (50) between the power supply unit and the first switching element for conducting or blocking between the power supply unit and the first switching element,
The fail-safe processing unit is configured as the first fail-safe process when the abnormality diagnosis unit determines that a predetermined current or more has flowed through a series path of the third switching element and the fourth switching element. In a state where the switching element is always off and the second switching element is always on, the cutoff switch and the fourth switching element are alternately turned on and off by the duty signal to perform reverse excitation of the field winding. The rotating electrical machine control apparatus according to claim 16. The rotating electrical machine unit includes an inverter circuit (22) that supplies an energization current to the armature winding according to a rotational phase of the rotating electrical machine,
18. The fail safe processing unit according to claim 6, wherein the reverse excitation is performed in a state in which a current phase of the armature winding in the inverter circuit is shifted by 180 degrees. Rotating electrical machine control device.   When it is determined that the abnormality has occurred, the fail-safe processing unit starts the reverse excitation at least after the elapse of a predetermined time having a time width in which the energization current flowing through the field winding is once zero. The rotating electrical machine control apparatus according to claim 18. The field circuit has a cut-off switch (50) between the power supply unit and the first switching element for conducting or blocking between the power supply unit and the first switching element,
When the abnormality diagnosis unit determines that a current greater than or equal to a predetermined amount has flowed through a series path of the third switching element and the fourth switching element, the fail-safe processing unit is configured to use the cutoff switch as the fail-safe process. The rotating electrical machine control device according to claim 16, wherein the motor is turned off.   The fail-safe processing unit, as the fail-safe processing, sets the cutoff switch in a cutoff state and turns off all the switching elements after the energization current flowing through the field winding becomes zero. Item 20. The rotating electrical machine control device according to Item 20. In the field circuit, the parallel path section includes a field magnet for detecting a field current flowing through the field winding between the field winding and the ground-side end of the second switching element. A current detection unit (55) is provided, and among the electrical paths at both ends of the second switching element, the ground-side electrical path has a state where the first switching element is off and the second switching element is on. A reflux current detector (56) for detecting the flowing reflux current is provided,
The acquisition unit acquires the field current detection value detected by the field current detection unit, and acquires the return current detection value detected by the return current detection unit,
The abnormality diagnosis unit is configured such that the field current detection value is zero even when the duty ratio of the duty signal increases, and the return current detection value is directed from the ground side to the power supply unit side through the second switching element. The rotating electrical machine control device according to any one of claims 1 to 21, wherein the abnormality diagnosis is performed on the basis of a predetermined value being equal to or greater than a predetermined value.   The fail safe processing unit has the field current detection value of zero even when the duty ratio of the duty signal is increased by the abnormality diagnosis unit, and from the ground side to the power source unit side through the second switching element. The rotating electrical machine control device according to claim 22, wherein the first switching element is turned off as the fail-safe process when it is determined that the return current detection value of the direction is equal to or greater than a predetermined value.   The rotation according to any one of claims 1 to 23, wherein the abnormality diagnosis unit performs the abnormality diagnosis based on the fact that the current detection value does not decrease and change even when the duty ratio of the duty signal decreases. Electric control device.   The fail-safe processing unit performs the second switching element as the fail-safe processing when the abnormality diagnosis unit determines that the detected current value does not change even when the duty ratio of the duty signal decreases. The rotating electrical machine control apparatus according to claim 24, wherein In addition to the first switching element and the second switching element, the field circuit includes a third switching element (53) provided in parallel with the first switching element, and the second switching element as the plurality of switching elements. A fourth switching element (54) provided in parallel with the element, each of these switching elements is provided connected in an H-bridge shape,
Instead of turning on and off the first switching element and the second switching element, a reverse excitation control unit that performs reverse excitation of the field winding by turning on and off the third switching element and the fourth switching element. With
The rotating electrical machine control device according to any one of claims 1 to 25, wherein the abnormality diagnosis unit performs the abnormality diagnosis based on a change in the current detection value in a state where the reverse excitation is performed.

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