JP4737093B2 - Control device for multiphase rotating electrical machine - Google Patents

Description

  The present invention relates to a control device for a multi-phase rotating electrical machine that controls an output of the multi-phase rotating electrical machine by operating a power conversion circuit that converts the power when power is exchanged between the multi-phase rotating electrical machine and a battery. .

  As a control device for this type of multiphase rotating electrical machine, for example, as seen in Patent Document 1 below, a battery is connected to a pair of input terminals, a capacitor and a discharge resistor of a power conversion circuit (inverter) via a contactor. A parallel connection has also been proposed. According to this, by closing the contactor, the battery and the inverter become conductive and the capacitor is charged. As a result, voltage fluctuation between the pair of input terminals of the inverter can be reduced. In addition, after disconnecting the inverter and the battery by opening the contactor, the charge of the capacitor can be discharged via the discharge resistor.

Further, in the above control device, when the voltage of the capacitor after the predetermined time has elapsed after the contactor is opened, it is determined that the abnormality is in the closed state even though the contactor is opened. is doing.
Japanese Patent No. 3330050

  By the way, in the control device for a multi-phase rotating electrical machine, the voltage of the battery can be variously set according to the specification. For this reason, a voltage detection circuit for detecting the voltage of the capacitor may need to be newly designed according to the voltage of the battery. Furthermore, some control devices for multi-phase rotating electrical machines have a booster circuit between the battery and the inverter, and the difference between the voltages at both ends of the capacitor is very significant between the one with and without the booster circuit. Become. For this reason, the voltage detection circuit must be designed according to the presence or absence of the booster circuit, and a large design change is required for the members constituting the control device.

  Further, in the above control device, when the contactor is in the closed state, even if the discharge resistor is disconnected, it is impossible to determine whether the discharge resistor is disconnected or not, so there is an abnormality in the discharge resistor. Therefore, it is impossible to grasp the situation where the capacitor is not discharged.

  The present invention has been made in order to solve the above-described problems, and its object is to provide a polyphase capable of suppressing design changes as much as possible even if the required specifications for the input voltage of the power conversion circuit are variously changed. The object is to provide a control device for a rotating electrical machine. Another object of the present invention is to provide a control device for a multi-phase rotating electrical machine capable of appropriately determining the presence or absence of abnormality of a discharge resistor connected in parallel with a pair of input terminals and a capacitor of a power conversion circuit. is there.

  Hereinafter, means for solving the above-described problems and the operation and effects thereof will be described.

The invention according to claim 1 is a series connection body of a plurality of resistors connected between a pair of input terminals of the power conversion circuit, and the plurality of resistors as voltage divisions between the pair of input terminals. And a voltage detection circuit for converting the input voltage into a voltage capable of detection operation for the control device, and an input voltage of the power conversion circuit based on an output voltage of the voltage detection circuit. And the voltage detection circuit includes a differential amplifier circuit, a capacitor is connected between a pair of input terminals of the power conversion circuit, and the resistor includes: It is characterized by comprising a discharging resistor for discharging the electric charge of the capacitor when the power conversion circuit and the capacitor are interrupted .

In the said invention, the voltage between a pair of input terminals is divided by the serial connection body of a some resistor, and the input voltage of a power converter circuit is calculated according to this. For this reason, since it is possible to cope with a change in the required specification for the input voltage of the power conversion circuit by changing the voltage dividing mode by changing the series connection body, the voltage for detecting the input voltage based on the divided voltage value It is possible to avoid changing the detection circuit . For this reason, the design change by a specification change can be suppressed as much as possible.

Further, when a capacitor is connected between the pair of input terminals of the power conversion circuit, voltage fluctuation between the pair of input terminals of the power conversion circuit can be suppressed, and as a result, the output control of the multiphase rotating electrical machine can be stabilized. it can. However, in this case, when the power conversion circuit and the battery are disconnected, it is desirable to provide a discharge resistor that discharges the charge of the capacitor. Here, in the above invention, a new means is provided for detecting the input voltage by making the resistor and the discharge resistor the same as the means for dividing and detecting the input voltage of the power conversion circuit. It can be avoided.

According to a second aspect of the present invention, in the first aspect of the present invention, a divided voltage value of the voltage between the pair of input terminals by the resistor is equal to or lower than a first threshold voltage or higher than the first threshold voltage. When the voltage is equal to or higher than the second threshold voltage, it is provided with a determination unit that determines that the resistor is abnormal.

  When the resistor below the connection point between the series connection body and the calculation means is disconnected, the divided voltage value becomes the potential on the positive terminal side of the pair of input terminals of the power conversion circuit. Even if the resistor above the connection point between the series connection body and the calculation means is short-circuited, the divided voltage value is the potential on the positive terminal side of the pair of input terminals of the power conversion circuit. On the other hand, when the resistor above the connection point between the series connection body and the calculation means is disconnected, the divided voltage value becomes the potential on the negative electrode terminal side of the pair of input terminals of the power conversion circuit. Moreover, even if the resistor below the connection point between the series connection body and the calculation means is short-circuited, the divided voltage value becomes the potential on the negative electrode terminal side of the pair of input terminals of the power conversion circuit. On the other hand, when there is no abnormality in the resistor, the divided voltage value is a value obtained by dividing the pair of input voltages of the power conversion circuit by the resistor. In the above invention, paying attention to this point, the first threshold value is set to a value smaller than the value obtained by dividing the pair of input voltages of the power conversion circuit by the resistor, and the second threshold value is set to the power conversion. A pair of input voltages of the circuit is set to a value larger than a value obtained by dividing by a resistor. Thereby, the presence or absence of abnormality of a resistor can be judged appropriately.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the calculation value is calculated by the detection value of the means for detecting the voltage of the battery and the calculation means regardless of the divided voltage value of the voltage at the pair of input terminals. Correction amount calculation means for calculating a correction amount of the input voltage calculated by the calculation means based on the comparison with the input voltage, and correction means for correcting the calculation mode of the input voltage by the calculation means by the correction amount And further comprising.

  Since the resistor is connected between a pair of input terminals of the power conversion circuit, it becomes a resistor for high power, and the resistance value increases because of the necessity of limiting the current. It tends to be low in accuracy. For this reason, the calculation accuracy of the input voltage based on the divided voltage value may be reduced. In this regard, in the above invention, the correction means is provided and the calculation mode of the calculation means is corrected, so that the low accuracy of the resistor can be compensated, and the input voltage can be calculated with high accuracy.

According to a sixth aspect of the present invention, in the invention according to any one of the third to fifth aspects, a boosting unit that boosts a voltage of the battery is provided between the power conversion circuit and the battery, and the resistor A body is provided between the boosting means and the power conversion circuit, and the correction amount calculating means calculates the correction amount when the boosting means is stopped.

  When the boosting means is provided, the correction amount cannot be calculated appropriately because the voltage of the battery and the input voltage of the power conversion circuit are not equal during the operation of the boosting means. In this regard, in the above-described invention, the correction amount can be calculated with high accuracy by calculating the correction amount when the booster is stopped.

  Hereinafter, a first embodiment in which a control device for a multi-phase rotating electrical machine according to the present invention is applied to a control device for a three-phase motor generator mounted on a hybrid vehicle will be described with reference to the drawings.

  FIG. 1 shows an overall configuration of a control system according to the present embodiment.

  As shown in the figure, an inverter 12 is connected to three phases (U phase, V phase, and W phase) of the motor generator 10. The inverter 12 is a three-phase inverter, and appropriately applies the voltage on the high-voltage battery 14 side to the three phases of the motor generator 10, and appropriately outputs the electric power generated by the motor generator 10 to the high-voltage battery 14. The voltage of the high voltage battery 14 is a predetermined high voltage (for example, “288V”) by storing the generated electric power.

  Specifically, the inverter 12 switches the switching elements SW1 and SW2 (U-phase arm) and the switching elements SW3 and SW4 (V-phase arm) so that each of the three phases is electrically connected to the positive electrode side or the negative electrode side of the high-voltage battery 14. It comprises a parallel connection body with switching elements SW5 and SW6 (W-phase arm). A connection point for connecting switching element SW <b> 1 and switching element SW <b> 2 in series is connected to the U phase of motor generator 10. Further, a connection point for connecting switching element SW3 and switching element SW4 in series is connected to the V phase of motor generator 10. Furthermore, a connection point for connecting switching element SW5 and switching element SW6 in series is connected to the W phase of motor generator 10. Further, flywheel diodes D1 to D6 are connected in antiparallel to these switching elements SW1 to SW6, respectively.

  A capacitor 20 and a discharge resistor 22 that discharges the electric charge of the capacitor 20 are connected to a pair of input terminals (points connecting U, V, and W phases) of the inverter 12. Since the capacitor 20 functions as a bypass capacitor, for example, when the motor generator 10 functions as an electric motor and consumes the power of the high-voltage battery 14, the capacitor 20 suppresses a rapid change in the input voltage of the inverter 12. On the other hand, the discharge resistor 22 is a series connection body of a pair of resistor 22a and resistor 22b.

  Further, a booster circuit 24 that boosts the voltage of the high-voltage battery 14 to a predetermined voltage (for example, “600 to 750 V”) is connected to the pair of input terminals. Between the high voltage battery 14 and the booster circuit 24, relays 26, 28, and 30 are provided for conducting and blocking between them. The relay 28 conducts and cuts off between the high voltage battery 14 and the booster circuit 24 via the resistor 32.

  The hybrid electronic control device (hybrid ECU 40) is an electronic control device that comprehensively manages the hybrid system. The hybrid ECU 40 includes a voltage detection circuit 42 that detects the voltage of the high-voltage battery 14 and a central processing unit 44.

  The motor generator electronic control device (MGECU 50) is an electronic control device for controlling the output of the motor generator 10 by operating the switching elements SW1 to SW6 of the inverter 12. The MGECU 50 includes, for example, an operation amplification circuit, and includes a voltage detection circuit 52 that detects a voltage drop amount due to the resistor 22b. The MGECU 50 includes a microcomputer (microcomputer 54) and a gate drive circuit 56 that applies a voltage to the gates of the switching elements SW1 to SW6.

  When operating the motor generator 10, the MGECU 50 (the microcomputer 54) first closes the relay 28 and the relay 30. Thereby, the electric power of the high voltage battery 14 is stored in the capacitor 20. At this time, the resistor 32 avoids an excessive amount of current flowing when the relays 28 and 30 are turned on. When the capacitor 20 is charged, the relay 26 is closed and the relay 28 is turned off, so that the relays 26 and 30 connect the inverter 12 and the high voltage battery 14 with low resistance. Further, the MGECU 50 boosts the voltage of the high-voltage battery 14 and outputs it to the inverter 12 by operating the booster circuit 24 at the time of acceleration control of the motor generator 10 or the like.

  Further, the MGECU 50 takes in the divided voltage value of the input voltage (voltage between the pair of input terminals) of the inverter 12 by the resistor 22a and the resistor 22b, and calculates the input voltage of the inverter 12 based on this value.

  By the way, the resistor 22a and the resistor 22b handle a large amount of power, and the power between the inverter 12 and the capacitor 20 and the high-voltage battery 14 when at least one of the relays 26 and 28 and the relay 30 are closed. The resistance value is set to be large so as not to hinder the transfer. For this reason, the resistors 22a and 22b are likely to have large errors in their resistance values, which may hinder the detection of the divided voltage value of the input voltage of the inverter 12 with high accuracy. Therefore, in this embodiment, when the booster circuit 24 is stopped, the input voltage calculation mode is corrected based on the voltage information (battery voltage Vb) of the high-voltage battery 14. FIG. 2 shows a procedure for calculating the input voltage of the inverter 12 according to the present embodiment. This process is repeatedly executed by the microcomputer 54 in the MGECU 54, for example, at a predetermined cycle.

  In this series of processing, first, in step S10, the divided voltage value V0 that is the output of the voltage detection circuit 52 is captured. Here, the divided voltage value V0 is obtained by converting an actual divided voltage value of the input voltage by the resistor 22a and the resistor 22b into a voltage value within the operating voltage of the microcomputer 54 by the voltage detection circuit 52. In the subsequent step S12, the input voltage Va of the inverter 12 is calculated. The input voltage Va is obtained by multiplying a ratio “(R1 + R2) / R2” of the resistance value R2 of the resistor 22a and the resistance value R2 of the resistor 22b to the resistance value R2 of the resistor 22b by the divided value V0. is there.

  In subsequent steps S14 to S18, processing for determining whether or not an execution condition of processing for calculating the correction amount H of the input voltage Va by the battery voltage Vb is satisfied is performed. That is, in step S14, it is determined whether or not the booster circuit 24 is stopped. This process is to determine whether or not the voltage of the high voltage battery 14 and the input voltage of the inverter 12 are assumed to be the same. In step S16, it is determined whether or not the relay 26 and the relay 30 are continuously closed (conductive state) for a certain period of time. This process determines whether or not the input voltage of the inverter 12 is stable. This is performed because the input voltage of the inverter 12 may fluctuate immediately after the relays 26 and 30 are closed, and the divided voltage value V0 may fluctuate. Further, in step S18, it is determined whether or not a fixed time has elapsed since all of the switching elements SW1 to SW6 of the inverter 12 are turned off. This process determines whether or not the input voltage fluctuates as the inverter 12 is operated.

  When an affirmative determination is made in all of the above steps S14 to S18, it is considered that the fluctuation between the input voltage Va and the battery voltage Vb of the inverter 12 is small, so that the calculation execution condition for the correction amount H is satisfied. The process proceeds to step S20. In step S20, an average value AVa of the input voltage Va is calculated. This process is a process for removing fluctuations in the input voltage Va. In subsequent step S22, an average value AVb of the battery voltage Vb is calculated. This process is a process for removing fluctuations in the battery voltage Vb. In step S24, the correction amount H is calculated based on the average value AVa of the input voltage Va and the average value AVb of the battery voltage Vb. Specifically, the correction amount H is calculated as the ratio of the average value AVb of the battery voltage Vb to the average value AVa of the input voltage Va.

  When a negative determination is made in any of the above steps S14 to S18, or when the process of step S24 is completed, the process proceeds to step S26. In step S26, the input voltage Va is corrected by the correction amount H. That is, the final input voltage Va is calculated by multiplying the input voltage Va calculated in step S12 by the correction amount H.

  In addition, when the process of step S26 is completed, this series of processes is once complete | finished.

  The MGECU 50 further performs a process of determining whether the resistor 22a and the resistor 22b are abnormal. FIG. 3 shows a procedure for determining whether there is an abnormality. This process is repeatedly executed by the microcomputer 54 in the MGECU 50, for example, at a predetermined cycle.

  In this series of processing, first, in step S30, it is determined whether or not at least one of the relay 26 and the relay 28 and the relay 30 are in a conductive state. In the subsequent step S32, it is determined whether or not the divided voltage value V0 output from the voltage detection circuit 52 is equal to or lower than the threshold voltage α. This process is to determine whether there is a disconnection abnormality of the resistor 22a and whether there is a short circuit abnormality of the resistor 22b. Here, the threshold voltage α is set to a value lower than the divided voltage value of the battery voltage Vb by the resistors 22a and 22b. In the present embodiment, the threshold voltage α is set to a minute voltage value about the voltage of the negative terminal of the pair of input terminals of the inverter 12. When it is determined that the voltage is equal to or lower than the threshold voltage α, it is determined in step S34 that there is an abnormality in which the upper resistor 22a is disconnected or an abnormality in which the lower resistor 22b is short-circuited. That is, when at least one of the relay 26 and the relay 28 and the relay 30 are in a conductive state, the voltage across the resistor 22a and the resistor 22b is considered to be equal to or higher than the battery voltage Vb. The value V0 should be equal to or higher than the value “Vb × R2 / (R1 + R2)” obtained by dividing the battery voltage Vb by the resistor 22a and the resistor 22b. Therefore, when the divided voltage value V0 is excessively lower than this value, the resistor 22a is disconnected or the resistor 22b is short-circuited so that the divided value V0 is an input terminal on the negative side of the inverter 12. It is thought that it has been lowered.

  On the other hand, when it is determined that the voltage is higher than the threshold voltage α, the process proceeds to step S36. In step S36, it is determined whether or not the booster circuit 24 is being driven. When the booster circuit 24 is being driven, in step S38, a threshold voltage β for determining whether or not the resistor 22b is disconnected or whether or not the resistor 22a is short-circuited is assumed when the booster circuit 24 is driven. Is set to a value obtained by multiplying the output voltage Vmax by the coefficient K. On the other hand, when the booster circuit 24 is not being driven, the threshold voltage β is set to a value obtained by multiplying the battery voltage Vb by the coefficient K in step S40. And if the process of step S38 and the process of step S40 are completed, it will transfer to step S42.

  In step S42, it is determined whether or not the divided voltage value V0 is equal to or higher than the threshold voltage β. This process is for determining the presence or absence of a disconnection abnormality in the resistor 22b and the presence or absence of a short circuit abnormality in the resistor 22a. Here, the coefficient K is set to a value larger than the ratio “R2 / (R1 + R2)” of the resistor 22b to the sum of the resistance values of the resistor 22a and the resistor 22b and not more than “1”. Yes. If there is no abnormality in the resistor 22a and the resistor 22b, the divided voltage value V0 should be about the value obtained by multiplying the input voltage Va of the inverter 12 by the ratio “R2 / (R1 + R2)”. That is, while the booster circuit 24 is being driven, the output voltage of the booster circuit 24 is approximately multiplied by the ratio “R2 / (R1 + R2)”. When the booster circuit 24 is stopped, the battery voltage Vb is compared with the ratio “R2”. / (R1 + R2) "should be about the value obtained by multiplication. Therefore, when the actual divided voltage value V0 is higher than this value, the resistor 22b is disconnected or the resistor 22a is short-circuited, so that the divided value reaches the potential of the input terminal on the positive side of the inverter 12. Judge that it has been raised.

  When it is determined in step S42 that the threshold voltage β is equal to or higher than the threshold voltage β, it is determined in step S44 that a short circuit abnormality of the upper resistor 22a or a disconnection abnormality occurs in the lower resistor 22b. In the process of step S34 or step S44, it is desirable to notify the outside that there is a disconnection abnormality, for example, via the display device 60 shown in FIG. Incidentally, when a negative determination is made in steps S30 and S42 described above, or when the processes in steps S34 and 44 are completed, this series of processes is temporarily terminated.

  By the above process, it is possible to accurately determine whether or not the resistor 22a and the resistor 22b constituting the discharge resistor 22 are abnormal. For this reason, when the discharge resistor 22 is disconnected, the capacitor 20 is maintained at a high voltage due to the disconnection abnormality of the discharge resistor 22 even though the relays 26, 28, and 30 are off. It can be notified to the outside that it is in a state. The presence or absence of this disconnection abnormality can be made by configuring the discharge resistor 22 with a plurality of resistors 22a and 22b and detecting the voltage (divided voltage value) at these connection points. On the other hand, for example, in the configuration in which the discharge resistor 23 is constituted by a single resistor as in the conventional example shown in FIG. I can't judge. In FIG. 4, members corresponding to those shown in FIG. 1 are given the same reference numerals for convenience.

  Furthermore, in this embodiment, as described above, in order to calculate the input voltage Va of the inverter 12 based on the divided voltage value V0, the design change of the MGECU 50 is performed regardless of the change in the specification of the drive voltage of the motor generator 10. Can be suppressed as much as possible. That is, for example, there is a large difference in the input voltage Va of the inverter 12 between the specification with the booster circuit 24 and the specification without the booster circuit 24. Therefore, in the configuration of the conventional example shown in FIG. Must be redesigned. Specifically, the voltage detection circuit 52 includes, for example, an operation amplification circuit, and the allowable maximum input voltage is determined in the voltage detection circuit 52 (operation amplification circuit or the like). For this reason, it may be necessary to change the design of the voltage detection circuit 52 for each specification so that the allowable maximum input voltage is equal to or greater than the maximum value of the input voltage Va of the inverter 12. This is not limited to the presence or absence of the booster circuit 24, and even when the voltage of the high-voltage battery 14 changes according to the specifications, the voltage detection circuit 52 may need to be redesigned accordingly.

  On the other hand, according to the present embodiment, an area (voltage level) in which the voltage value input to the voltage detection circuit 52 can be taken only by changing the resistance values of the resistors 22a and 22b constituting the discharge resistor 22. Can be at the same level regardless of the specifications. For this reason, it is not necessary to change the design of the voltage detection circuit 52, and the design change of the MGECU 54 is a software change that changes the unit of the divided voltage value V0 output from the voltage detection circuit 52 (the previous figure). 2 or modification of the processing program of FIG. 3) is sufficient. Incidentally, this software change is also a necessary change in the conventional example shown in FIG.

  According to the embodiment described in detail above, the following effects can be obtained.

  (1) The input voltage Va of the inverter 12 was calculated based on the divided value of the input voltage Va of the inverter 12 by the plurality of resistors 22a and 22b connected between the pair of input terminals of the inverter 12. Thereby, it is possible to cope with a change in the specification of the drive voltage of the inverter 12 by changing the voltage dividing mode by changing the resistance values of the resistors 22a and 22b. Therefore, the input voltage Va is set based on the divided value. It is possible to avoid changing the voltage detection circuit 52 to be detected. For this reason, the design change by a specification change can be suppressed as much as possible.

  (2) A capacitor 20 that functions as a bypass capacitor is connected between a pair of input terminals of the inverter 12, and the discharge resistor 22 that discharges the electric charge of the capacitor 20 is configured by the resistors 22a and 22b. Thereby, the discharge resistor 22 for discharging the electric charge of the capacitor 20 can be shared with the resistors 22a and 22b for dividing the input voltage Va and detecting it.

  (3) When the input voltage Va is equal to or lower than the first threshold voltage (the divided voltage value V0 is equal to or lower than the threshold voltage α) or equal to or higher than the second threshold voltage (the divided voltage value V0 is equal to or higher than the threshold voltage β), the discharge resistor 22 It was judged that there was an abnormality. Thereby, the presence or absence of abnormality of the discharge resistor 22 can be determined appropriately.

  (4) The calculation mode of the input voltage Va is corrected based on the comparison between the battery voltage Vb detected by the hybrid ECU 40 and the input voltage Va calculated by the MGECU 50. As a result, the low accuracy of the discharge resistor 22 can be compensated, and the input voltage Va can be calculated with high accuracy.

  (5) When the booster circuit 24 is stopped, the correction amount H of the input voltage Va is calculated. Thereby, the correction amount H can be calculated with high accuracy.

(Other embodiments)
Each of the above embodiments may be modified as follows.

  In FIG. 3, the conduction state of the relays 26, 28, 30 is used as an execution condition for determining whether there is an abnormality. However, this condition may not be provided. That is, even immediately after the relays 26, 28, and 30 are shut off, the presence or absence of abnormality can be quickly determined by the same process as the process illustrated in FIG. For this reason, it is possible to quickly determine whether or not the capacitor 20 is in an undischargeable state due to the disconnection of the discharge resistor 22.

  In the process shown in step S12 of FIG. 2, the input voltage Va is calculated from the divided voltage value V0 each time. However, a process for relaxing the change in the input voltage Va may be further performed. For example, instead of calculating the input voltage Va directly after obtaining the divided voltage value V0 in step S10, a predetermined sampling value is set for each of the previous sampling value and the current sampling value for the divided voltage value V0. This can be realized by performing weighted average processing (smoothing processing) for averaging by weighting. According to such change mitigation processing, resistance to noise or the like can be improved. If the relaxation process is performed, the correction amount H can be calculated with high accuracy even if the process of step S20 is removed.

  In the above embodiment, the calculation mode of the input voltage Va is corrected by correcting the input voltage Va calculated from the divided voltage value V0 by the correction amount H, but the present invention is not limited to this. For example, the output of the voltage detection circuit 52 itself may be corrected according to the correction amount. This can be performed, for example, by configuring the voltage detection circuit 52 with a differential amplification circuit including an operational amplifier and making the resistance value of a resistor connected to the operational amplifier variable.

  In the above embodiment, the correction amount H is calculated by the MGECU 50 at a predetermined period even after the hybrid system is shipped, but the present invention is not limited to this. For example, the correction amount may be calculated based on detection of an error in the resistance value of the discharge resistor 22 before product shipment and stored in the MGECU 50. At this time, a computer for a production line or the like may be used without providing the MGECU 50 with a function of detecting an error in the resistance value of the resistor in the manufacturing process of the hybrid system. However, in this case, since an error is detected in the manufacturing process, problems such as an increase in manufacturing time and an increase in human costs are caused. Therefore, an error in the resistance value of the discharge resistor 22 is detected. It is desirable to mount a processing function for calculating the correction amount H in the MGECU 50. In addition, since the resistance value of the discharge resistor 22 has temperature characteristics, it is desirable to update the correction amount H at a predetermined period.

  The discharge resistor 22 is not limited to being constituted by two resistors, but may be constituted by three or more resistors. Further, even if the hybrid system does not include the capacitor 20, such as a configuration that does not require the discharge resistor 22, by detecting the divided value of the input voltage Va of the inverter 12 using a plurality of resistors, The effect (1) of the embodiment can be obtained.

  -As a control apparatus of polyphase rotary electricity, it is not restricted to what is mounted in a hybrid system, For example, you may mount in an electric vehicle.

The figure which shows the whole structure of the control system concerning one Embodiment. The flowchart which shows the procedure of the calculation process of the input voltage of the inverter concerning the embodiment. The flowchart which shows the procedure of the judgment process of the presence or absence of abnormality of the discharge resistor concerning the embodiment. The figure which shows the whole structure of the conventional control system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Motor generator, 12 ... Inverter, 20 ... Capacitor, 22 ... Discharge resistor, 50 ... MGECU, 52 ... Voltage detection circuit.

Claims (6)

In the control device for a multi-phase rotating electrical machine that controls the output of the multi-phase rotating electrical machine by operating a power conversion circuit that converts the power when transferring power between the multi-phase rotating electrical machine and the battery,
A series connection body of a plurality of resistors connected between a pair of input terminals of the power conversion circuit;
A voltage detection circuit that takes as input a voltage across both ends of the plurality of resistors as voltage division between the pair of input terminals, and converts the input voltage into a voltage that can be detected by the control device; ,
Calculating means for calculating an input voltage of the power conversion circuit based on an output voltage of the voltage detection circuit;
The voltage detection circuit is configured to include a differential amplifier circuit,
A capacitor is connected between a pair of input terminals of the power conversion circuit,
The control device for a multi-phase rotating electrical machine , wherein the resistor is constituted by a discharging resistor for discharging the electric charge of the capacitor when the power conversion circuit and the capacitor are disconnected . When the divided voltage value of the voltage between the pair of input terminals by the resistor is equal to or lower than the first threshold voltage or higher than the second threshold voltage higher than the first threshold voltage, the resistor is abnormal. controller of the multi-phase electric rotating machine according to claim 1 Symbol mounting, characterized in that it comprises a determining means for determining that there is. The input calculated by the calculation means based on the comparison between the detected value of the means for detecting the voltage of the battery and the input voltage calculated by the calculation means without depending on the divided voltage value of the voltage at the pair of input terminals. A correction amount calculating means for calculating a voltage correction amount;
The correction amount by the controller of the multi-phase electric rotating machine according to claim 1, wherein further comprising a correction means for correcting the mode of calculating the input voltage by the calculating means. The battery and the capacitor are connected via a relay,
4. The multiphase rotating electric machine according to claim 3 , wherein the comparison between the detected value and the input voltage calculated by the calculating means is performed on the condition that a predetermined time has passed since the relay was turned on. Control device. The comparison between the detected value and the input voltage calculated by the calculating means is performed on condition that a certain time has elapsed since all the switching elements constituting the power conversion circuit are turned off. The control device for a multiphase rotating electrical machine according to claim 3 or 4 . Boosting means for boosting the voltage of the battery is provided between the power conversion circuit and the battery, and the resistor is provided between the boosting means and the power conversion circuit;
6. The control apparatus for a multi-phase rotating electrical machine according to claim 3 , wherein the correction amount calculation means calculates the correction amount when the boosting means is stopped.

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