JP2016208791A - Controller for switched reluctance motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controller for switched reluctance motor capable of appropriately updating an excitation pattern.SOLUTION: The controller for switched reluctance motor includes a control part which executes application control to a coil of a switched reluctance motor. The control part executes application control based on an excitation pattern corresponding to a rotational speed and a command torque of the switched reluctance motor. The control part generates an update request from a present excitation pattern to another excitation pattern (step S30-Y) while applying an excitation voltage to the coil (step S40-Y), and prohibits update to another excitation pattern (step S60) when an excitation voltage by another excitation pattern becomes a value of a reverse symbol to the excitation voltage by the current excitation pattern or zero (step S50-Y).SELECTED DRAWING: Figure 4

Description

  The present invention relates to a control device for a switched reluctance motor.

  Conventionally, there is a technique for changing the excitation condition of a switched reluctance motor. For example, Patent Document 1 discloses a technique for controlling an SR motor that switches an excitation start angle and an excitation end angle in each control mode at low load, medium load, and high load. According to Patent Document 1, it is controlled to an optimum excitation start angle and excitation end angle in order to maintain the rotation speed and torque required in the operation condition, and as a result, the operation efficiency is improved.

JP2013-240200A

  When the excitation pattern of the switched reluctance motor is updated according to a load or the like, torque fluctuation or efficiency reduction may occur due to the update of the excitation pattern. For example, when the excitation pattern is updated while the excitation voltage is being applied to the coil, if the difference between the applied voltage by the excitation pattern before the update and the applied voltage by the excitation pattern after the update is large, Noise and vibration may increase due to fluctuations, and efficiency may be reduced. It is desirable that the excitation pattern can be updated appropriately while suppressing torque fluctuations and efficiency reductions.

  The objective of this invention is providing the control apparatus of the switched reluctance motor which can update an excitation pattern appropriately.

  A control device for a switched reluctance motor according to the present invention includes a control unit that performs application control on a coil of the switched reluctance motor, and the control unit has an excitation pattern according to a rotational speed and a command torque of the switched reluctance motor. The control unit performs an application control based on the current excitation pattern while the excitation voltage is applied to the coil, and an update request from the current excitation pattern to the other excitation pattern is generated. When the excitation voltage has a value opposite to the excitation voltage of the current excitation pattern or 0, updating to another excitation pattern is prohibited.

  The control device for the switched reluctance motor has an effect that the excitation pattern can be appropriately updated by prohibiting the update of the excitation pattern when a sudden fluctuation of the excitation voltage occurs.

  The control device for a switched reluctance motor according to the present invention generates an update request from the current excitation pattern to another excitation pattern while applying the excitation voltage to the coil, and the excitation voltage by the other excitation pattern is generated. When the excitation voltage of the current excitation pattern has a value opposite to that of the excitation voltage or 0, updating to another excitation pattern is prohibited. According to the switched reluctance motor control device of the present invention, it is possible to suppress an abrupt change in the excitation voltage accompanying the update of the excitation pattern and to update the excitation pattern appropriately.

FIG. 1 is a schematic configuration diagram of a vehicle according to an embodiment. FIG. 2 is a cross-sectional view of a main part of the switched reluctance motor according to the embodiment. FIG. 3 is a diagram illustrating an example of excitation pattern switching. FIG. 4 is a flowchart showing the operation of the switched reluctance motor control apparatus according to the embodiment. FIG. 5 is a flowchart illustrating an operation according to the first modification of the embodiment. FIG. 6 is a flowchart illustrating an operation according to the second modification of the embodiment. FIG. 7 is a schematic configuration diagram of a vehicle according to a third modification of the embodiment. FIG. 8 is a schematic configuration diagram of a vehicle according to a fourth modification example of the embodiment. FIG. 9 is a schematic configuration diagram of a vehicle according to a fifth modification example of the embodiment. FIG. 10 is a schematic configuration diagram of a vehicle according to a sixth modification example of the embodiment. FIG. 11 is a schematic configuration diagram of a vehicle according to a seventh modification example of the embodiment. FIG. 12 is a schematic configuration diagram of a vehicle according to an eighth modification example of the embodiment.

  Hereinafter, a switched reluctance motor control apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

[Embodiment]
The embodiment will be described with reference to FIGS. 1 to 4. The present embodiment relates to a control device for a switched reluctance motor. FIG. 1 is a schematic configuration diagram of a vehicle according to an embodiment of the present invention.

  As shown in FIG. 1, a vehicle 1 includes a switched reluctance motor (hereinafter referred to as “SRM”) 2, wheels 3, an engine 4, a transmission 5, a battery 9, and a switched reluctance motor. And the control device 100. The switched reluctance motor control device 100 of this embodiment includes a control unit 30 and a detection unit 8. Wheel 3 includes a left front wheel 3FL, a right front wheel 3FR, a left rear wheel 3RL, and a right rear wheel 3RR.

  The engine 4 and the SRM 2 are power sources for the vehicle 1. The engine 4 converts the combustion energy of fuel into rotational motion. The engine 4 of this embodiment is an internal combustion engine. The engine 4 is connected to left and right drive shafts 7 and 7 via a transmission 5 and a differential gear 6. The transmission 5 is, for example, a stepped or continuously variable automatic transmission or a manual transmission. One of the drive shafts 7, 7 is connected to the left front wheel 3FL, and the other is connected to the right front wheel 3FR. Accordingly, the front wheels 3FL and 3FR are driven by the output torque of the engine 4 (hereinafter referred to as “engine torque”).

  The left rear wheel 3RL and the right rear wheel 3RR can rotate independently of each other. The rear wheels 3RL and 3RR are driven by the output torque of the SRM 2 (hereinafter referred to as “motor torque”). The SRM 2 is connected to the battery 9. The SRM 2 has a function of an electric motor that converts electric power supplied from the battery 9 into torque, and a function of an electric generator that converts the torque transmitted from the wheels 3 into electric power and charges the battery 9. The SRM 2 of this embodiment is a so-called in-wheel motor. The SRM 2 includes a left motor 2L and a right motor 2R. The left motor 2L is connected to the left rear wheel 3RL and drives the left rear wheel 3RL. The right motor 2R is connected to the right rear wheel 3RR and drives the right rear wheel 3RR.

  The control unit 30 has a function of controlling the engine 4 and the SRM 2 and is, for example, an electronic control unit (ECU). The control unit 30 adjusts the output torque of the engine 4 to a target torque value by intake control, fuel injection control, ignition control, and the like of the engine 4.

  As shown in FIG. 2, the SRM 2 has a stator 21 and a rotor 22. The stator 21 is fixed so as not to rotate with respect to the vehicle body. The stator 21 has a cylindrical stator body 23. A plurality of salient poles 24 made of a magnetic material are provided on the inner peripheral surface of the stator body 23. The salient poles 24 project from the inner peripheral surface of the stator body 23 toward the radially inner side of the stator body 23. The salient poles 24 are arranged at a predetermined interval, for example, at equal intervals along the circumferential direction. Coils 25 are wound around the salient poles 24, respectively.

  The rotor 22 is connected to the wheel 3 and rotates integrally with the wheel 3. The rotor 22 has a cylindrical rotor body 26. A plurality of salient poles 27 made of a magnetic material are provided on the outer peripheral surface of the rotor body 26. The salient poles 27 protrude from the outer peripheral surface of the rotor body 26 toward the radially outer side of the rotor body 26. The salient poles 27 are arranged at a predetermined interval, for example, at equal intervals along the circumferential direction. The rotor 22 is disposed on the inner side of the stator 21 so that the central axis of the stator 21 and the central axis of the rotor 22 coincide with each other. The rotor 22 is supported by a bearing so as to be rotatable relative to the stator 21.

  When a current flows through the coil 25 of a certain salient pole 24 in the stator 21, a magnetic flux generated between the salient pole 24 and the salient pole 27 of the rotor 22 due to the current causes a gap between the salient pole 24 and the salient pole 27. A suction force F is generated. A component Fr in the circumferential direction of the suction force F becomes a rotational force that rotates the rotor 22. The SRM 2 has a control circuit that controls energization timing and energization amount for each coil 25. The control circuit performs energization control of each coil 25 according to a command from the control unit 30. The rotor 22 is rotationally driven by appropriately switching the coil 25 to be energized according to the rotational position of the rotor 22. Further, the energization amount of each coil 25 is adjusted according to the command value of the output torque of SRM2.

  Returning to FIG. 1, the detection unit 8 detects the rotational position of the SRM 2. The rotational position of the SRM 2 is the rotational position of the rotor 22 that is a rotor. The detection unit 8 is a resolver, for example, and can detect the rotational position of the rotor 22 with high accuracy. The detection unit 8 includes a left detection unit 8L and a right detection unit 8R. The left detection unit 8L detects the rotational position of the rotor 22 of the left motor 2L. The right detector 8R detects the rotational position of the rotor 22 of the right motor 2R. A signal indicating the detection result of the detection unit 8 is output to the control unit 30.

  The control unit 30 adjusts the output torque of the SRM2 to a target torque value by current control of the SRM2. The control unit 30 of the present embodiment performs application control on the coil 25 of the SRM 2 based on a predetermined excitation pattern. The control unit 30 according to the present embodiment adjusts the voltage applied to the coil 25 with reference to a predetermined excitation pattern. The control unit 30 adjusts the effective value of the voltage applied to the coil 25 by duty control, for example, PWM control. As described with reference to FIG. 3, the control unit 30 switches ON / OFF of energization of the coil 25 of one salient pole 24 according to the rotational position of the SRM 2.

  FIG. 3 shows an example of excitation pattern switching for one coil 25. FIG. 3A shows a first application pattern Vp1 and a first excitation pattern Ip1. Further, (b) shows a second application pattern Vp2 and a second excitation pattern Ip2. The excitation patterns Ip1 and Ip2 define the correspondence between the rotational position of the SRM2 and the current value that flows through the coil 25. In the SRM 2 of the present embodiment, the plurality of coils 25 are divided into three phases. The phases of the excitation patterns Ip1 and Ip2 of each phase are shifted from each other.

  The application patterns Vp1 and Vp2 are a correspondence relationship between the rotation position of the SRM 2 and the application command to the coil 25 corresponding to each excitation pattern Ip1 and Ip2. For example, the control unit 30 determines the target applied voltage of the coil 25 based on the current values of the excitation patterns Ip1 and Ip2 and the current value that actually flows through the coil 25. The control unit 30 issues an application command to the coil 25 based on the target application voltage. The control unit 30 of the present embodiment can execute three modes of a positive application command, a negative application command, and a non-application command as application command modes for the control circuit of the SRM 2. The control unit 30 outputs any one application command from three application commands to one coil 25.

  The positive application command is a command for applying a predetermined positive voltage + V1 to the coil 25. Here, the positive voltage is a voltage for driving the SRM 2 in the positive rotation direction. The positive rotation direction is the rotation direction of the rotor 22 of the SRM 2 when the vehicle 1 travels forward. The negative application command is a command for applying a predetermined negative voltage −V1 to the coil 25. The negative voltage −V1 is a voltage value having the same magnitude as that of the positive voltage + V1 but having an opposite sign. The non-application command is a command that does not apply a voltage to the coil 25.

  The control unit 30 calculates a command value (hereinafter referred to as “motor command torque”) of the output torque of the SRM 2 based on the total required torque of the driver, as will be described below. The control unit 30 calculates the total required torque of the driver based on the acceleration operation amount by the driver, typically the accelerator opening. The total required torque is a driver's required value related to the total torque of the axial torques of the front wheels 3FL and 3FR and the rear wheels 3RL and 3RR. The control unit 30 calculates the driver's required driving force based on the accelerator opening and the vehicle speed, and calculates the total required torque from the required driving force.

  The control unit 30 distributes the total required torque to the front wheels 3FL, 3FR and the rear wheels 3RL, 3RR. For example, the control unit 30 distributes the total required torque to the target shaft torque of the front wheels 3FL and 3FR and the target shaft torque of the rear wheels 3RL and 3RR according to a predetermined distribution ratio. The control unit 30 calculates a command value of output torque for the engine 4 (hereinafter referred to as “engine command torque”) from the target shaft torques of the front wheels 3FL and 3FR. The control unit 30 executes intake control, fuel injection control, ignition control, and the like of the engine 4 so that the output torque of the engine 4 is the engine command torque.

  The control unit 30 calculates a motor command torque for the SRM 2 from the target shaft torque of the rear wheels 3RL and 3RR. For example, the control unit 30 causes the left motor 2L and the right motor 2R to output the target shaft torque of the rear wheels 3RL and 3RR equally. In this case, the control unit 30 sets the motor command torque of the left motor 2L and the motor command torque of the right motor 2R to the same value, and calculates the sum of the motor command torque of the left motor 2L and the motor command torque of the right motor 2R as the rear wheel 3RL. , 3RR target shaft torque. When there is a speed reduction mechanism between the SRM 2 and the rear wheels 3RL and 3RR, the motor command torque is calculated based on the speed reduction ratio. Control unit 30 selects the excitation pattern of SRM2 based on the rotational speed of SRM2 and the motor command torque.

  The excitation pattern varies depending on the rotation speed of the SRM 2 and the motor command torque. For example, the excitation interval determined in the excitation pattern varies depending on the rotation speed and the motor command torque. The excitation interval is an interval from the start of excitation to the end of excitation in the excitation pattern. For example, in the first excitation pattern Ip1 shown in FIG. 3A, excitation is started from the rotational position θ1, and excitation is ended at the rotational position θ4. Therefore, the excitation interval of the first excitation pattern Ip1 is the interval from the rotation position θ1 to the rotation position θ4. The excitation interval of the second excitation pattern Ip2 shown in (b) is from the rotational position θ3 to the rotational position θ5. In each of the excitation patterns Ip1 and Ip2, energization ON (positive or negative application command) and energization OFF (non-application command) for the coil 25 are alternately repeated in the excitation interval. The voltage applied to the coil 25 is increased or decreased by increasing or decreasing the ratio of the time during which energization is turned on.

  The excitation interval tends to be longer when the rotational speed is high than when the rotational speed is low. As an example, when the rotational speed is high, the starting point of the excitation interval is advanced before the rotational speed is low. When the magnitude of the motor command torque is large, the excitation interval tends to be longer than when the magnitude of the motor command torque is small. As an example, when the magnitude of the motor command torque is large, the starting point of the excitation interval is put forward than when the magnitude of the motor command torque is small.

  The control unit 30 updates the excitation pattern according to changes in the rotation speed of the SRM 2 and the motor command torque. For example, the control unit 30 repeats the determination of whether or not the excitation pattern needs to be updated at a predetermined cycle. When it is time to determine whether or not the excitation pattern needs to be updated, the control unit 30 reads the current rotation speed and motor command torque of the SRM 2. The control unit 30 determines an excitation pattern (hereinafter referred to as “update candidate pattern”) corresponding to the current rotation speed and the motor command torque. When the update candidate pattern is different from the current excitation pattern, an excitation pattern update request is generated.

  When the excitation pattern update request is generated while the excitation voltage is being applied to the coil 25, the control unit 30 according to the present embodiment determines whether or not the update to the update candidate pattern is permitted. The control unit 30 prohibits the update of the excitation pattern when the drivability and the efficiency are likely to decrease due to the update of the excitation pattern. With reference to FIG. 3, an example will be described in which drivability and efficiency decrease due to update of the excitation pattern.

  In FIG. 3, an update request from the first excitation pattern Ip1 to the second excitation pattern Ip2 is generated at the rotational position θ2. The comparative example (c) shows a transition Vc of applied voltage and a transition Ic of current when an excitation pattern update request is permitted at the rotational position θ2. From the rotational positions θ1 to θ2, application control to the coil 25 is performed according to the first excitation pattern Ip1. A positive application command is issued from the rotational position θ1 to the rotational position θ2, and the value of the current flowing through the coil 25 increases. The excitation pattern is updated at the rotational position θ2, and application control based on the second excitation pattern Ip2 is started. Since the rotational position θ2 is outside the excitation interval of the second excitation pattern Ip2, the target current value is zero. On the other hand, the actual current value at the rotational position θ2 is a positive value. As a result, a negative application command is issued so that the current value becomes zero. When the application command is switched, problems such as an increase in torque ripple, an increase in radial force, and a decrease in efficiency are likely to occur.

  On the other hand, the control unit 30 of the present embodiment generates an update request from the current excitation pattern to another excitation pattern while applying an excitation voltage to the coil 25, and excitation by another excitation pattern. When the voltage has a value opposite to the excitation voltage of the current excitation pattern or 0, updating to another excitation pattern is prohibited. For example, a positive application command is issued between the rotational position θ1 and the rotational position θ2, and the excitation voltage according to the current excitation pattern is a predetermined positive voltage + V1. On the other hand, the excitation voltage based on the second excitation pattern Ip2 at the rotational position θ2 is a predetermined negative voltage −V1 and has an opposite sign. As described above, when the excitation voltage of the coil 25 has an opposite sign due to the update of the excitation pattern, the update of the excitation pattern is prohibited.

  On the other hand, when the application command based on the current excitation pattern and the application command based on another excitation pattern are in the same mode, update of the excitation pattern is permitted. When the excitation voltage based on the current excitation pattern and the excitation voltage based on the update candidate excitation pattern have the same sign or are both 0, the excitation pattern update is permitted. Thus, according to the switched reluctance motor control device 100 of the present embodiment, the torque ripple is reduced by preventing the mode switching of the application command from occurring. Further, noise and vibration due to an increase in radial force are suppressed. Further, a decrease in efficiency due to switching of the application command is suppressed. It is also effective in preventing erroneous determination.

  With reference to FIG. 4, the operation of the switched reluctance motor control apparatus 100 of the present embodiment will be described. The flowchart in FIG. 4 is repeatedly executed at predetermined intervals, for example. Note that the flowchart of FIG. 4 may be executed for one SRM2 or may be executed for all SRM2. The control unit 30 executes, for example, the processing according to the flowchart of FIG. 4 for the left motor 2L and the processing according to the flowchart of FIG. 4 for the right motor 2R alternately or in parallel. Here, the operation when the flowchart of FIG. 4 is executed for the left motor 2L will be described.

  In step S10, the control unit 30 reads information. The control unit 30 acquires the vehicle speed, the accelerator opening, the rotational position of the left motor 2L, the rotational speed of the left motor 2L, and the like. When executing step S10, the control unit 30 proceeds to the process of step S20.

  In step S20, the control unit 30 derives a command torque (requested torque) for the SRM2. The control unit 30 newly calculates the motor command torque of the left motor 2L, or acquires the current motor command torque of the left motor 2L that has already been calculated. When executing step S20, the control unit 30 proceeds to the process of step S30.

  In step S30, the control unit 30 determines whether or not an excitation pattern update request has occurred. The control unit 30 selects an excitation pattern corresponding to the current rotation speed and motor command torque of the left motor 2L from among the stored excitation patterns. When the selected excitation pattern is different from the current excitation pattern, the control unit 30 makes an affirmative determination (step S30-Y) in step S30 and proceeds to the process of step S40. On the other hand, when the selected excitation pattern is the same as the current excitation pattern, the control unit 30 makes a negative determination (step S30-N) in step S30 and proceeds to the process of step S80.

  In step S40, the control unit 30 determines whether or not it is within the excitation interval. The control unit 30 determines whether or not the current rotation position of the left motor 2L is a rotation position within the excitation interval of the current excitation pattern. When the current rotational position of the left motor 2L is a position included in any of the three-phase excitation sections, the control unit 30 of the present embodiment makes an affirmative determination (step S40-Y) in step S40 and performs step S50. Proceed to the process. On the other hand, if the rotation position of the left motor 2L is not included in any of the three-phase excitation sections, the control unit 30 makes a negative determination (step S40-N) in step S40 and proceeds to the process of step S70.

  In step S50, the control unit 30 determines whether or not the excitation voltage according to the updated excitation pattern is the reverse sign or 0. In step S50, it is determined whether or not the mode switching of the application command is generated by updating the excitation pattern for the coil 25 of the phase that is currently controlled for application among the three-phase coils 25. Based on the excitation pattern (update candidate excitation pattern) selected in step S30 and the current rotational position of the left motor 2L, the control unit 30 determines the application determined from the update candidate excitation pattern when the excitation pattern is updated. Predict orders. When the application command determined from the update candidate excitation pattern is an application command in a mode different from the application command determined from the current excitation pattern, the control unit 30 makes an affirmative determination (step S50-Y) in step S50. The process proceeds to step S60. On the other hand, if the application command determined from the update candidate excitation pattern is a command in the same mode as the application command determined from the current excitation pattern, a negative determination is made in step S50 (step S50-N), and the process of step S70 is performed. Proceed to

  In step S60, the control unit 30 prohibits updating of the excitation pattern. The control unit 30 prohibits changing the excitation pattern for the left motor 2L. When executing step S60, the control unit 30 proceeds to the process of step S80.

  In step S70, the control unit 30 permits the update of the excitation pattern. The control unit 30 updates the excitation pattern used for the application control of the left motor 2L to the update candidate excitation pattern. When executing step S70, the control unit 30 proceeds to the process of step S80.

  In step S80, the control unit 30 executes application control. The control unit 30 determines and outputs an application command for the control circuit of the left motor 2L based on the excitation pattern currently employed. The control unit 30 issues a non-application command to the control circuit of the SRM 2 when the current rotational position of the left motor 2L is outside the excitation section of the excitation pattern currently employed. The control part 30 will once complete | finish a control process, if step S80 is performed.

  As described above, the control unit 30 of the switched reluctance motor control device 100 according to the present embodiment applies another excitation pattern from the current excitation pattern while applying the excitation voltage to the coil 25 (step S40-Y). When an update request to the excitation pattern is generated (step S30-Y) and the excitation voltage based on the other excitation pattern has the opposite sign or 0 from the excitation voltage based on the current excitation pattern (step S50-Y), Updating to the excitation pattern is prohibited (step S60). Therefore, the switched reluctance motor control device 100 can suppress a sudden change in the excitation voltage accompanying the update of the excitation pattern, and can appropriately update the excitation pattern.

  In the present embodiment, the case where the rotational position of the SRM 2 is within the excitation interval is referred to as “while the excitation voltage is being applied to the coil 25”, but instead, the application command to the coil 25 is a positive application command. The negative application command may be “while applying the excitation voltage to the coil 25”.

  In this embodiment, if the rotational position of the SRM2 is within the excitation interval of any phase, updating of the excitation pattern of all phases is prohibited, but instead, the rotational position of the SRM2 is within the excitation interval. The update of the excitation pattern may be prohibited only for the phases that are present, and the update of the excitation pattern may be permitted for the other phases.

[First Modification of Embodiment]
A first modification of the embodiment will be described with reference to FIG. In the first modified example of the embodiment, the difference from the above embodiment is that whether or not to update the excitation pattern is determined based on the length of the excitation interval. More specifically, when an excitation pattern update request is generated while the excitation voltage is being applied to the coil 25, the control unit 30 determines whether the excitation interval is shortened due to the excitation pattern update. The control unit 30 prohibits the update of the excitation pattern when the excitation interval of the updated excitation pattern is shorter than the excitation interval of the current excitation pattern. The control unit 30 inhibits the torque ripple from increasing by prohibiting the update of the excitation pattern that shortens the excitation interval.

  With reference to FIG. 5, the operation | movement which concerns on the 1st modification of the control apparatus 100 of a switched reluctance motor is demonstrated. The flowchart shown in FIG. 5 is repeatedly executed at predetermined intervals, for example. When the vehicle 1 is equipped with a plurality of SRMs 2, the flowchart of FIG. 5 may be executed for each SRM 2.

  Steps S110 to S130 are the same as steps S10 to S30 in the above embodiment (FIG. 4). In step S140, the control unit 30 determines whether or not the current rotational position is within the excitation interval. The control unit 30 proceeds to the process of step S150 when an affirmative determination is made in step S140 (step S140-Y), and proceeds to the process of step S170 when a negative determination is made (step S140-N).

  In step S150, the control unit 30 determines whether or not the updated excitation interval is equal to or greater than the current excitation interval. When the angle range in the excitation interval of the excitation pattern of the update candidate is equal to or larger than the angle range in the excitation interval of the current excitation pattern, the control unit 30 makes an affirmative determination in step S150 (step S150-Y) and performs the process in step S160. Proceed to On the other hand, when the excitation interval of the excitation pattern of the update candidate is an angle range narrower than the excitation interval of the current excitation pattern, the control unit 30 makes a negative determination (step S150-N) in step S150 and performs the process of step S170. Proceed to

  In step S160, the control unit 30 allows the excitation pattern to be updated for the determination target SRM2. When executing step S160, the control unit 30 proceeds to the process of step S180.

  In step S170, the control unit 30 prohibits the update of the excitation pattern for the determination target SRM2. When executing step S170, the control unit 30 proceeds to the process of step S180.

  In step S180, the control unit 30 executes application control. The control unit 30 determines an application command for the control circuit of the SRM 2 based on the excitation pattern currently employed. The control unit 30 issues a non-application command to the control circuit of the SRM 2 when the current rotational position of the SRM 2 is outside the excitation section of the excitation pattern currently employed. The control part 30 will once complete | finish a control process, if step S180 is performed.

  As described above, in the first modification, the control unit 30 generates an excitation pattern update request while applying the excitation voltage to the coil 25, and the excitation interval is shortened by updating the excitation pattern. Prohibits renewal of excitation pattern. Therefore, in addition to the effect of the above-described embodiment, it is possible to achieve an effect of improving the processing speed by renewing the excitation pattern as necessary.

[Second Modification of Embodiment]
A second modification of the embodiment will be described with reference to FIG. In the second modification of the embodiment, the difference from the above embodiment is that whether or not to update the excitation pattern is determined based on whether or not the current rotational position of the SRM 2 is within the excitation interval. It is. When the current rotational position of the SRM 2 is a position within the excitation interval of the current excitation pattern, the control unit 30 prohibits updating of the excitation pattern. The control unit 30 inhibits the torque ripple from increasing by prohibiting the update of the excitation pattern at the rotational position within the excitation interval.

  With reference to FIG. 6, the operation | movement which concerns on the 2nd modification of the control apparatus 100 of a switched reluctance motor is demonstrated. The flowchart shown in FIG. 6 is repeatedly executed at predetermined intervals, for example. When the vehicle 1 is equipped with a plurality of SRMs 2, the flowchart of FIG. 5 may be executed for each SRM 2.

  Steps S210 to S230 are the same as steps S10 to S30 in the above embodiment (FIG. 4). In step S240, the control unit 30 determines whether or not the current rotational position is within the excitation interval. The control unit 30 proceeds to the process of step S250 when an affirmative determination is made in step S240 (step S240-Y), and proceeds to the process of step S260 when a negative determination is made (step S240-N).

  In step S250, the control unit 30 prohibits the update of the excitation pattern for the determination target SRM2. When executing step S250, the control unit 30 proceeds to the process of step S270.

  In step S260, the control unit 30 allows the excitation pattern to be updated for the determination target SRM2. When executing step S260, the control unit 30 proceeds to the process of step S270.

  In step S270, the control unit 30 executes application control. The control unit 30 determines an application command for the control circuit of the SRM 2 based on the excitation pattern currently employed. The control unit 30 issues a non-application command to the control circuit of the SRM 2 when the current rotational position of the SRM 2 is outside the excitation section of the excitation pattern currently employed. The control part 30 will once complete | finish a control process, if step S270 is performed.

  As described above, in the second modification, the control unit 30 generates an excitation pattern update request while applying the excitation voltage to the coil 25, and the current rotational position of the SRM 2 is the current excitation pattern. If it is within the excitation interval, update of the excitation pattern is prohibited. According to the 2nd modification, there can exist the same effect as the above-mentioned embodiment.

[Third Modification of Embodiment]
A third modification of the embodiment will be described with reference to FIG. The third modification is different from the above embodiment in that SRMs 2 are arranged on all the wheels 3 of the vehicle 1. The vehicle 1 has four SRMs 2 including a left front motor 2FL, a right front motor 2FR, a left rear motor 2RL, and a right rear motor 2RR. The left front motor 2FL is connected to the left front wheel 3FL and drives the left front wheel 3FL. The right front motor 2FR is connected to the right front wheel 3FR and drives the right front wheel 3FR. The left rear motor 2RL is connected to the left rear wheel 3RL and drives the left rear wheel 3RL. The right rear motor 2RR is connected to the right rear wheel 3RR and drives the right rear wheel 3RR.

  The left front detector 8FL detects the rotational position and rotational speed of the left front motor 2FL. The right front detection unit 8FR, the left rear detection unit 8RL, and the right rear detection unit 8RR detect the rotational positions and rotational speeds of the right front motor 2FR, the left rear motor 2RL, and the right rear motor 2RR, respectively. Signals indicating detection results of the detection units 8FL, 8FR, 8RL, and 8RR are output to the control unit 30. The battery 9 is connected to each motor 2FL, 2FR, 2RL, 2RR, and exchanges electric power with each motor 2FL, 2FR, 2RL, 2RR.

  The controller 30 controls each motor 2FL, 2FR, 2RL, 2RR. The controller 30 determines the motor command torque of each motor 2FL, 2FR, 2RL, 2RR based on the total required torque of the driver. The control unit 30 performs application control of each motor 2FL, 2FR, 2RL, 2RR with an excitation pattern corresponding to the rotation speed and motor command torque of each motor 2FL, 2FR, 2RL, 2RR.

  The control unit 30 determines whether or not to permit the update of the excitation pattern in the same manner as in the embodiment and the first and second modifications of the embodiment. For example, the control unit 30 generates an update request from the current excitation pattern to another excitation pattern while applying the excitation voltage to the coil 25, and the excitation voltage based on the other excitation pattern depends on the current excitation pattern. When the value is opposite to the excitation voltage or 0, updating to another excitation pattern is prohibited. The control unit 30 may prohibit the update of the excitation pattern when the excitation interval becomes narrow due to the update of the excitation pattern, or the excitation pattern when the rotational position of the SRM 2 is within the excitation interval of the current excitation pattern. The update of may be prohibited.

[Fourth Modification of Embodiment]
A fourth modification of the embodiment will be described with reference to FIG. The fourth modification is different from the above embodiment in that the SRM 2 drives the front wheels 3FL and 3FR, and the engine 4 drives the rear wheels 3RL and 3RR.

  As shown in FIG. 8, the engine 4 is connected to the left rear wheel 3RL and the right rear wheel 3RR via a transmission 5, a differential gear 6, and left and right drive shafts 7,7. The left motor 2L is connected to the left front wheel 3FL and drives the left front wheel 3FL. The right motor 2R is connected to the right front wheel 3FR and drives the right front wheel 3FR. The control unit 30 determines whether or not to update the excitation pattern of the SRM 2 in the same manner as in the above embodiment and the first and second modifications of the above embodiment.

[Fifth Modification of Embodiment]
A fifth modification of the embodiment will be described with reference to FIG. The fifth modification is different from the above embodiment in that the vehicle 1 uses the SRM 2 as the only power source. As shown in FIG. 9, the front wheels 3FL and 3FR of the vehicle 1 are driven wheels. The left motor 2L drives the left rear wheel 3RL, and the right motor 2R drives the right rear wheel 3RR. The control unit 30 distributes the total required torque of the driver to the left motor 2L and the right motor 2R. The motor command torque may be equally distributed to the left and right motors 2L and 2R. The control unit 30 determines whether or not to permit the update of the excitation pattern in the same manner as in the embodiment and the first and second modifications of the embodiment.

[Sixth Modification of Embodiment]
A sixth modification of the embodiment will be described with reference to FIG. The sixth modification differs from the fifth modification (FIG. 9) of the above embodiment in that the rear wheels 3RL and 3RR are driven by one SRM2. As shown in FIG. 10, the front wheels 3FL, 3FR of the vehicle 1 are driven wheels. The SRM 2 is connected to the left rear wheel 3RL and the right rear wheel 3RR via the differential gear 10 and the left and right drive shafts 11, 11. The differential gear 10 distributes the torque output from the SRM 2 to the left rear wheel 3RL and the right rear wheel 3RR.

  The control unit 30 calculates the motor command torque of the SRM 2 based on the total required torque of the driver. Based on the reduction gear ratio of differential gear 10, control unit 30 determines the motor command torque of SRM2 so that the total shaft torque of rear wheels 3RL and 3RR is equal to the total required torque. The control unit 30 determines whether or not to permit the update of the excitation pattern in the same manner as in the embodiment and the first and second modifications of the embodiment.

[Seventh Modification of Embodiment]
A seventh modification of the embodiment will be described with reference to FIG. The seventh modification is different from the sixth modification in that an engine 4 for driving the front wheels 3FL and 3FR is provided. As shown in FIG. 11, the engine 4 is connected to the left front wheel 3FL and the right front wheel 3FR via a transmission 5, a differential gear 6, and left and right drive shafts 7,7. The control unit 30 distributes the total required torque of the driver to the engine command torque and the motor command torque. The control unit 30 determines whether or not to permit the update of the excitation pattern in the same manner as in the embodiment and the first and second modifications of the embodiment.

[Eighth Modification of Embodiment]
With reference to FIG. 12, an eighth modification of the embodiment will be described. The eighth modification differs from the fifth modification (FIG. 9) in that the SRM 2 drives the front wheels 3FL and 3FR. As shown in FIG. 12, the left motor 2L is connected to the left front wheel 3FL and drives the left front wheel 3FL. The right motor 2R is connected to the right front wheel 3FR and drives the right front wheel 3FR. About others, it is the same as that of the said 5th modification.

[Ninth Modification of Embodiment]
The power source mounted in addition to the SRM 2 is not limited to the engine 4 and may be, for example, a motor. An example of a motor used as a power source other than the SRM 2 is an AC synchronous motor using a permanent magnet.

  The contents disclosed in the above embodiments and modifications can be executed in appropriate combination.

1 Vehicle 2 Switched Reluctance Motor (SRM)
3 Wheel 8 Detection Unit 9 Battery 21 Stator 22 Rotor 100 Switched Reluctance Motor Control Device Ip1 First Excitation Pattern Ip2 Second Excitation Pattern Vp1 First Application Pattern Vp2 Second Application Pattern

Claims (1)

A control unit that performs application control on the coil of the switched reluctance motor is provided.
The control unit performs the application control based on an excitation pattern according to a rotational speed and a command torque of the switched reluctance motor,
The controller generates an update request from the current excitation pattern to another excitation pattern while applying the excitation voltage to the coil, and the excitation voltage according to the other excitation pattern is the current excitation voltage. An apparatus for controlling a switched reluctance motor, characterized by prohibiting updating to another excitation pattern when the excitation voltage by the pattern has a value opposite in sign or 0.

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