JP2021136738A - Switching device control method and switching device control system - Google Patents

Abstract

To provide a switching device control method and a switching device control system, capable of executing a spreading mode in a more appropriate operation point range of a rotary electric machine.SOLUTION: A switching device control method executes a spreading mode of changing a carrier frequency of a carrier wave at a predetermined switching cycle depending on an operation point of a rotary electric machine by controlling a switching device for converting power from a DC power supply using PWM control and supplying converted power to the rotary electric machine. The spreading mode is executed in the case that the operation point of the rotary electric machine is in a power running time spreading region set for power running time during power running of the rotary electric machine. The spreading mode is also executed in the case that the operation point of the rotary electric machine is in a regeneration time spreading region set for regeneration time during regeneration of the rotary electric machine.SELECTED DRAWING: Figure 3

Description

The present invention relates to a switching device control method and a switching device control system.

Patent Document 1 discloses a control method for executing PWM (Pulse Width Modulation) control of an inverter as a switching device for adjusting the electric power supplied to a load (three-phase AC motor).

In particular, in the control method of Patent Document 1, in the high torque region or high rotation speed region of the motor in which the ripple current of the inverter increases, a diffusion mode for changing (spreading) the frequency (carrier frequency) of the carrier wave is executed to execute the ripple current. The noise (sound vibration) caused by the increase in the frequency is suppressed.

Japanese Unexamined Patent Publication No. 2015-106979

However, the increase in the ripple current of the inverter does not necessarily occur only in the high torque region or the high rotation speed region of the motor. Therefore, with the conventional control method described above, there is a possibility that the diffusion mode cannot be executed in an appropriate scene. In particular, the preferred motor operating point differs between the power running state and the regenerative state of the motor from the viewpoint of executing the diffusion mode. Therefore, there is a concern that noise may be generated due to improper execution of the diffusion mode in the scene where the diffusion mode should be executed.

Therefore, an object of the present invention is to provide a switching device control method and a switching device control system capable of executing a diffusion mode in a more appropriate operating point range of a rotating electric machine.

According to an aspect of the present invention, a switching device that converts electric power from a DC power source and supplies it to a rotary electric machine by PWM control is controlled, and a carrier frequency of a carrier is changed at a predetermined switching cycle according to an operating point of the rotary electric machine. A switching device control method for executing a varying diffusion mode is provided.

In this switching device control method, the diffusion mode is executed when the operating point of the rotary electric machine is included in the power running diffusion region set for the power running during the power running of the rotating electric machine, and the rotating electric machine rotates during the regeneration. The diffusion mode is executed when the operating point of the electric machine is included in the regeneration diffusion region set for regeneration.

According to the above aspect, the diffusion mode can be executed in a more suitable operating point range of the rotary electric machine.

FIG. 1 is a diagram illustrating a configuration of a switching device control system common to each embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a carrier frequency setting mode in the diffusion mode. FIG. 3 is a flowchart illustrating a switching device control method according to the first embodiment. FIG. 4 is a flowchart illustrating the details of the power running diffusion region determination. FIG. 5 is a flowchart illustrating the details of the diffusion region determination during regeneration. FIG. 6 is a flowchart illustrating the details of the diffusion mode setting process. FIG. 7 is a map showing an operating point range that defines a power running diffusion region and a power running normal region. FIG. 8 is a map showing an example of the operating point range for setting the diffusion mode and the normal mode at the time of regeneration. FIG. 9 is a flowchart illustrating a process of changing the second switching time during power running according to the operating point of the motor during power running according to the second embodiment. FIG. 10 is a flowchart illustrating a process of changing the second switching time during regeneration according to the operating point of the motor during regeneration according to the second embodiment. FIG. 11 is a map for explaining the operating point range corresponding to the divided region for changing the second switching time during power running in the power running diffusion region. FIG. 12 is a map for explaining the operating point range corresponding to the divided region for changing the second switching time during regeneration in the diffusion region during regeneration. FIG. 13 is a diagram illustrating a configuration of a power supply system to which an external circuit is attached according to the third embodiment. FIG. 14 is a diagram showing an equivalent circuit of the power supply system. FIG. 15 is a map showing an example of an operating point range that defines a diffusion region during power running. FIG. 16 shows the frequency spectrum of the ripple current when an external circuit is attached. FIG. 17 is a flowchart illustrating a switching device control method according to the fourth embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Prerequisite configuration common to each embodiment]
FIG. 1 is a diagram illustrating a configuration of a switching device control system 200 common to each embodiment.

As shown in the figure, the switching device control system 200 includes an inverter 10 as a switching device and a control device 100 that controls the inverter 10.

The inverter 10 includes a battery 1 as a DC power source composed of a power storage device such as a lithium ion secondary battery, and a motor 2 as a rotary electric machine which is, for example, a three-phase AC motor (particularly a three-phase AC motor for vehicles). Placed between.

The inverter 10 includes a switching circuit 11 composed of a plurality of semiconductor elements and a smoothing capacitor 15.

The switching circuit 11 is composed of three phases and six arms, that is, an upper arm and a lower arm in each of the three phases of UVW, and includes six switching elements 12 configured as semiconductor elements.

Then, when the motor 2 is powered, the switching operation (opening / closing of the switching element 12) in the switching circuit 11 is executed in response to the PWM signal input from the control device 100, so that the DC power from the battery 1 is a desired AC. It is converted into electric power and supplied to the motor 2. On the other hand, when the motor 2 is regenerated, the switching operation in the switching circuit 11 is executed, so that the rotational energy of the motor 2 is converted into DC power and supplied to the battery 1.

Further, the smoothing capacitor 15 is provided between the positive electrode line and the negative electrode line of the battery 1 in parallel with the switching circuit 11 and on the battery 1 side with respect to the switching circuit 11. The smoothing capacitor 15 smoothes the ripple current generated in the inverter 10.

Further, the switching device control system 200 includes a current sensor 4 that detects the current supplied from the switching element 12 to the motor 2, a resolver 5 as a magnetic position sensor that detects the magnetic position of the rotor of the motor 2, and a battery 1. A voltage sensor 16 for detecting the terminal voltage of the above is provided. The detection signal of each sensor is output to the control device 100. In the following, the detected value of the current sensor 4 is also simply referred to as "three-phase current detected value (i _ur ^* , i _vr ^* , i _wr ^* )". Further, the detected value of the voltage sensor 16 is also _{simply referred to as "DC voltage V dc".}

Next, the configuration of the control device 100 will be described. The control device 100 includes a central computing device (CPU), a read-only memory (ROM), a random access memory (RAM), and an input / output interface (I / O interface), and is programmed so that each process described later can be executed. Consists of computers. It is also possible to configure the control device 100 with a plurality of computer hardware that distributes and executes each process.

^{In particular, the control device 100 has a required torque (torque command value T *} ) and a three-phase current detection value ( _ir ) of the motor 2 determined based on an externally required load (in the case of a vehicle, the amount of operation on the accelerator pedal, etc.). , I _vr , i _wr ), the detected value of the resolver 5, and the DC voltage V _dc are acquired as inputs, and a PWM signal is generated based on each of these detected values and output to the inverter 10.

Specifically, the control device 100 includes a current command value calculation unit 101, a current control unit 102, a dq / uvw conversion unit 103, a signal conversion unit 104, a uvw / dq conversion unit 105, and a motor position calculation unit 106.

The current command value calculation unit 101 receives ^{inputs of the torque command value T *} , the DC voltage V _dc , and the electric angular velocity ω from the motor position calculation unit 106. Based on these inputs, the current command value calculation unit 101 calculates the dq-axis current command value ( _id ^* , i _q ^* ) using a predetermined map. Then, the current command value calculation unit 101 outputs the calculated dq-axis current command value ( _id ^* , i _q ^* ) to the current control unit 102.

The current control unit 102, dq axis current command value from the current command value calculating section ^{_{101 (i d *, i q}} *), and, dq axis current detection values from the uvw / dq conversion unit 105 (i _dr, i _qr ) Is accepted. The current control unit 102 uses feedback control such as PI control so that the deviation between the _{dq-axis current command value (id} ^* , i _q ^* ) and the dq-axis current detection value ( _{id dr} , i _{qr) becomes zero.} , Dq Calculate the voltage command value (v _d ^* , v _q ^*). The current control unit 102 outputs the dq voltage command value (v _d ^* , v _q ^* ) to the dq / uvw conversion unit 103.

The dq / uvw conversion unit 103 uses the dq voltage command value (v _d ^* , v _q ^* _{) from the current control unit 102 as the three-phase voltage command value (v u)} using the magnetic pole position θe from the motor position calculation unit 106. ^* , V _v ^* , v _w ^* ). The dq / uvw conversion unit 103 outputs the obtained three-phase voltage command values (v _u ^* , v _v ^* , v _w ^* ) to the signal conversion unit 104.

The signal conversion unit 104 uses a three-phase voltage command value (v _u ^* , v _v ^* , v _w ^* ) and a carrier wave generated by a carrier wave generator (not shown) (generally, a triangular wave having a carrier frequency of about several kHz to several kHz. ), And a PWM signal used for switching control of the inverter 10 is generated. Then, the signal conversion unit 104 outputs the generated PWM signal to the inverter 10. Then, the inverter 10 operates the switching element 12 of the switching circuit 11 in a switching pattern corresponding to the PWM signal.

As a result, at the time of power running, the DC power supplied from the battery 1 is supplied to the motor 2 with the three-phase AC power corresponding _{to the three-phase voltage command values (v u} ^* , v _v ^* , v _w ^*). Further, at the time of regeneration, the rotational energy of the motor 2 is converted into DC power according to the _{three-phase voltage command values (v u} ^* , v _v ^* , v _w ^{*) and supplied to the battery 1.}

The uvw / dq conversion unit 105 uses the three-phase current detection value (i _ur , i _vr , i _wr ) detected by the current sensor 4 as the dq axis current detection value using the magnetic pole position θe from the motor position calculation unit 106. Convert to (i _dr , i _qr). Then, the uvw / dq conversion unit 105 outputs the dq-axis current detection value (i _dr , i _qr ) to the current control unit 102.

The motor position calculation unit 106 calculates the magnetic pole position θe and the electric angular velocity ω from the detected values of the resolver 5. The motor position calculation unit 106 outputs the calculated magnetic pole position θe and the electric angular velocity ω to the dq / uvw conversion unit 103 and the uvw / dq conversion unit 105, respectively.

The control device 100 (particularly the signal conversion unit 104) having the configuration described above makes the carrier frequency constant according to the operating point of the motor 2 in each of the case where the motor 2 is in the power running state and the case where the motor 2 is in the regenerative state. Set the normal mode and the diffusion mode to change this.

Here, in the normal mode, the carrier frequency is set to the fundamental frequency F0 corresponding to twice the control cycle t of the voltage command value. On the other hand, in the normal mode in which a single carrier frequency is set, the ripple current is concentrated on a predetermined frequency depending on the operating point of the motor 2, and the ripple voltage level of the frequency becomes large. Therefore, in the scene where the ripple current should be suppressed, the diffusion mode is set. In the diffusion mode, the fundamental frequency F0 (first frequency) and the diffusion frequency F1 (second frequency), which is an integral multiple of the fundamental frequency F0, are alternately set as the carrier frequency. The details of the diffusion mode will be described below.

FIG. 2 is a diagram illustrating an example of a carrier frequency setting mode in the diffusion mode. In the example shown in FIG. 2, the diffusion frequency F1 is set to twice the fundamental frequency F0. Further, in the diffusion mode, the time for setting the fundamental frequency F0 (hereinafter, _{also referred to as “first switching time t 21} ”) is set to twice the control cycle t. Further, the time for setting the diffusion frequency F1 (hereinafter, _{also referred to as “second switching time t 22} ”) is set to twice the control cycle t.

Therefore, in the example shown in FIG. 2, in the diffusion mode, the carrier frequency is set to alternately repeat between the fundamental frequency F0 and the diffusion frequency F1 at intervals of twice the control cycle t.

The diffusion frequency F1 is not limited to twice the fundamental frequency F0. That is, if the diffusion frequency F1 has a value different from the fundamental frequency F0 (particularly a value larger than the fundamental frequency F0), it can be appropriately set to an arbitrary value. However, for the reason described later, it is preferable that the diffusion frequency F1 is set to an integral multiple such as twice, three times, or four times the fundamental frequency F0. Further, the first switching time t ₂₁ and the second switching time t ₂₂ can be appropriately set in addition to those shown in FIG. In particular, the first switching time t ₂₁ and the second switching time t ₂₂ may be set to different values.

By executing the above-mentioned diffusion mode, an increase in the ripple voltage due to the carrier frequency being concentrated on a specific frequency is suppressed. As a result, the capacitance required for the smoothing capacitor 15 can be reduced from the viewpoint of smoothing the ripple voltage, and the smoothing capacitor 15 can be miniaturized.

Further, the control device 100 compares the magnitude relationship between the voltage command value and the carrier wave, transmits an off signal (or an on signal) when the instantaneous value of the carrier wave is equal to or higher than the voltage command value, and the instantaneous value is the voltage command. When it becomes lower than the value, the PWM signal is generated by repeating the transmission of the on signal (or the off signal). In particular, the control device 100 sets the time during which the on signal (or off signal) continues as the pulse width, and periodically changes the pulse width.

Further, the period of the carrier wave (the reciprocal of each of the fundamental frequency F0 and the diffusion frequency F1) is set to an integral multiple of the control period t. As a result, it is possible to suppress a change in the difference (phase difference) between the timing of switching the carrier frequency and the timing of updating the voltage command value, and it is possible to preferably synchronize the carrier wave and the voltage command value. Therefore, in the inverter 10, it is possible to suppress a decrease in torque accuracy and the occurrence of torque ripple when the carrier frequency is switched. In particular, it is preferable to make the phase difference between the carrier wave and the voltage command value zero by synchronizing the carrier wave and the voltage command value.

The carrier frequency can be switched when the instantaneous value of the carrier wave reaches a position in the middle (zero point) of the amplitude of the carrier wave, and the instantaneous value is the peak (maximum value or the maximum value) of the amplitude of the carrier wave. It is also possible to switch when the position reaches the minimum value.

In each of the embodiments described below, the control device 100 suppresses the ripple current, suppresses the heat rise of the switching circuit 11, and suppresses noise based on the operating point of the motor 2 when the motor 2 is power running and regenerating. The normal mode and the diffusion mode are switched in a preferable manner from the viewpoint of suppression and balance between the energy efficiency (electricity cost) of the motor 2.

[First Embodiment]
Hereinafter, the first embodiment will be described.

FIG. 3 is a flowchart illustrating a switching device control method according to the first embodiment. The control device 100 (particularly, the signal conversion unit 104) repeatedly executes the routine shown in FIG. 3 at predetermined control cycles.

First, in step S110, the control device 100 determines whether or not the motor 2 is in the power running state. Specifically, the control device 100 determines that the motor 2 is in the power running state when at least one of the motor rotation speed N and the q-axis current command value i _q ^* is a positive value, and if not, the motor 2 is in a power running state. It is determined that the motor 2 is not in the power running state (that is, in the regenerative state). Whether or not the motor 2 is in the power running state may be determined by whether or not the torque command value T _m ^* is positive instead of the motor rotation speed N or the q-axis current command value i _q ^*. ..

Then, when the control device 100 determines that the motor 2 is in the power running state, the control device 100 proceeds to step S120 and executes the power running diffusion region determination. On the other hand, when the control device 100 determines that the motor 2 is in the regenerative state, the control device 100 proceeds to step S130 and executes the regeneration time diffusion region determination.

FIG. 4 is a flowchart illustrating the details of the power running diffusion region determination.

As shown in the figure, in the power running diffusion region determination, the control device 100 has the q-axis current detection value i _qr corresponding to the current motor torque T equal to or higher than the power running basic current threshold i _{q_d0} , and the motor rotation speed N. _{When is equal to} or greater than the basic lower limit rotation speed N_ d0_inf during power running and less than or equal to the basic upper limit rotation speed N_ _{d0_up} during power running (when the determination results in steps S121 and S122 are both Yes), the operating point of the motor 2 is in the diffusion region (when the determination results in steps S121 and S122 are both Yes). Hereinafter, it is determined that the vehicle is included in the “powering diffusion region _{Adp”) (step S123).}

On the other hand, in other cases (when at least one of the determination results in step S121 and step S122 is No), the operating point of the motor 2 is included in the normal region (hereinafter, also referred to as " _{normal region A db during power running").} (Step S124).

Further, FIG. 5 is a flowchart illustrating the details of the determination of the diffusion region during regeneration. As shown in the figure, in the control device 100, the q-axis current detection value i _{qr is equal to} or higher than the basic current threshold i q_r0 during regeneration, the motor rotation speed N is _{equal to} or higher than the basic lower limit rotation speed N_ r0_inf during regeneration, and the basic upper limit rotation during regeneration. When the number is N_ _{r0_up} or less (when the determination results of steps S131 and S132 are both Yes), the operating point of the motor 2 is included in the diffusion region (hereinafter, also referred to as _{“regeneration diffusion region A rp”).} (Step S133).

On the other hand, in other cases (when at least one of the determination results in step S131 and step S132 is No), the operating point of the motor 2 is included in the normal region (hereinafter, also referred to as " _{normal region during regeneration Arb").} (Step S134).

Returning to FIG. 3, the control device 100 shifts to the process of step S140 after the power running diffusion region determination in step S120 or the regeneration diffusion region determination in step S130.

In step S140, when the control device 100 determines that the operating point of the motor 2 is included in the power running diffusion region _Adp or the regeneration diffusion region A _rp , the control device 100 shifts to the diffusion mode setting process in step S150. On the other hand, if this is not the case (when it is determined that the operating point of the motor 2 _{is included in the normal region A db} during power running or the normal region _{Ar rb} during regeneration), the control device 100 shifts to the normal mode setting process in step S160. ..

Here, in the normal mode setting process, the control device 100 keeps the carrier frequency constant. On the other hand, in the diffusion mode setting process, the control device 100 changes the carrier frequency in a mode determined for each of the power running state and the regenerative state. The details of the diffusion mode setting process will be described below.

FIG. 6 is a flowchart illustrating the details of the diffusion mode setting process.

As shown in the figure, when the operating point of the motor 2 _{is included in the power running diffusion region Adp} , the control device 100 executes a diffusion mode defined for power running (hereinafter, “power running diffusion mode”). (Yes in step S151 and step S152).

Specifically, alternately during power running spreading mode, the control device 100, the carrier frequency, between the fundamental frequency F0 with a predetermined be power running spread frequency F1_ _d as spread frequency F1 for power running of the first frequency Switch to.

Further, the control device 100 sets the first switching time t ₂₁ _ _{d during power running as the first switching time t 21} described above, which is the time for setting the first frequency as the carrier frequency. Further, the control device 100 sets the second switching time t ₂₂ _ _{d during power running as the above-mentioned second switching time t 22} which is the time for setting the second frequency as the carrier frequency.

In the present embodiment, to set the power running spread frequency F1_ _d to two times the fundamental frequency F0. However, not limited to this, the power running time spread frequency F1_ _d may be set to an integral multiple of the least three times the fundamental frequency F0. Further, in the present embodiment, the first switching time t ₂₁ _ _d during power running and the second switching time t ₂₂ _ _d during power running are the same as each other and are set to an integral multiple (for example, twice) of the control cycle t. ..

On the other hand, when the operating point of the motor 2 _{is included in the regeneration diffusion region Arp} , the control device 100 executes a diffusion mode defined for regeneration (hereinafter, “regeneration diffusion mode”) (step). No of S151 and step S153).

Specifically, alternating in the regeneration time spreading mode, the control device 100, the carrier frequency, between the fundamental frequency F0 with a predetermined be regenerated when spread frequency F1_ _r as spread frequency F1 for regeneration when the first frequency Switch to.

The control device 100 includes a first switch time t _21, set the first switching time during regenerative defined for regeneration at t ₂₁ _ _r. Further, the control unit 100, a second switching time t _22, set the second switching time during regenerative defined for regeneration at t ₂₂ _ _r.

In the present embodiment, the regeneration time spread frequency F1_ _r similarly to the power running spread frequency F1_ _d, is set to twice the fundamental frequency F0. However, not limited thereto, and may be set during regeneration spread frequency F1_ _r an integer multiple of the least three times the fundamental frequency F0, it may be set to a value different from the power running time spread frequency F1_ _d.

As described above, in the switching device control method in the present embodiment, when the motor 2 is in the power running state, the _{diffusion mode is executed when the operating point is included in the power running diffusion region Adp} , and the power running normal Execute normal mode when it is included in the area A _db. On the other hand, when the motor 2 is in the regenerative state, the _{diffusion mode is executed when the operating point is included in the regeneration diffusion region A rp} , and the normal mode is executed when the operation point is included in the regeneration normal region _{Ar b.} That is, the diffusion mode and the normal mode are switched based on the diffusion region and the normal region individually defined according to each of the power running and the regeneration.

Next, the technical significance of switching between the diffusion mode and the normal mode during power running and regeneration of the present embodiment will be described.

FIG. 7 is a map showing an operating point range that defines the _{power running diffusion region Adp} and the power running normal region A _db. FIG. 8 is a map showing an operating point range that defines the _{regeneration diffusion region A rp} and the regeneration normal region A _rb. In FIG. 8, the vertical axis and the horizontal axis are reversed for convenience from the viewpoint of representing the motor torque T (<0) and the motor rotation speed N (<0) at the time of regeneration.

Further, the maps shown in FIGS. 7 and 8 are determined in advance by experiments or the like, and are stored in a memory (not shown) in the control device 100 or a storage area of an arbitrary device that the control device 100 can communicate with in order to acquire the map. It will be saved.

First, as shown in FIG. 7, during powering diffusion region A _dp is a the motor torque T is higher during power running basic torque threshold T _{Q_d0} (corresponding to power running operation basic current threshold i _{q_d0),} motor rotation speed N is powering It is set as an operating point range that is equal to or greater than the basic lower limit rotation speed N_ _{d0_inf} and less than or equal to the basic upper limit rotation speed N_ _{d0_up during power running.}

Here, in the diffusion mode during power running of this embodiment, as the carrier frequency, the fundamental frequency F0 equivalent to twice the control cycle t, set alternately equivalent to twice the power running spread frequency F1_ _d of the fundamental frequency F0 .. Therefore, as described above, it is possible to suppress an increase in the ripple current, while suppressing a decrease in torque accuracy and the occurrence of torque ripple when switching the carrier frequency. On the other hand, since the average value of the carrier frequencies per hour increases by performing such switching, the energy loss due to switching becomes larger than when the carrier frequency is fixed at the fundamental frequency F0, and the energy efficiency of the motor 2 becomes higher. It is also expected to decrease. Therefore, it is desirable to keep the range of operating points where the diffusion mode is executed to the minimum necessary.

In response to such a situation, in the present embodiment, in particular, in the operating point range in which the request for suppressing the decrease in energy efficiency should be prioritized over the request for changing the carrier frequency in order to suppress the increase in the ripple current (noise). A certain energy suppression region C1 (shown by a broken line in FIG. 7) is set, and at least the power running diffusion region _Adp is set so as to avoid the energy suppression region C1.

In particular, it determined in view of avoiding energy suppression region C1, during powering diffusion region A power running as a lower limit value of the motor torque T which defines the _dp basic torque threshold T _{Q_d0} and (during power running basic current threshold i _{q_d0). Therefore, the power running basic current threshold value i q_d0} used in the determination in step S121 of FIG. 4 is set so as to exceed the value _{of the q-axis current i q} corresponding to the maximum value of the motor torque T in the energy suppression region C1.

Further, in the heat generation region C2 (particularly, the operating point range that can be taken during low rotation and high torque operation and when the motor is locked), which is the operating point range in which the motor rotation speed N is relatively low and the motor torque T is equal to or higher than a certain value. Is concentrated in the switching element 12 because the current is concentrated in the specific switching element 12.

Therefore, in the present embodiment, the diffusion mode is executed in the heat generation region C2 from the viewpoint of suppressing the generation of heat generation exceeding the design heat resistant capacity of the inverter 10 due to the increase in the frequency of switching operations. Set the _{diffusion region Adp} during power running so that it does not occur. Specifically, the heat generation region C2 is defined as an operating point range of the motor rotation speed N such that the heat generation amount of the inverter 10 exceeds the permissible value when the diffusion mode is executed. _{Therefore, the basic lower limit rotation speed N_d0_inf} during power running used in the determination in step S122 of FIG. 4 is set to be a value equal to or higher than the upper limit of the rotation speed in the heat generation region C2.

In the present embodiment, the upper limit of the motor torque T in the power running diffusion region _Adp is set so as to substantially coincide with the upper limit torque according to the characteristics of the motor 2. As a result, the range of the maximum torque according to the specifications of the motor 2 _{can be set in the diffusion region Adp} during power running, so that the diffusion mode can be executed more reliably in the high torque region where the ripple current is more likely to increase. Can be done.

The upper limit of the motor rpm N at power running diffusion region A _dp (power running operation basic upper limit rotation speed _{N_} d0_up) is characteristic of the motor 2 is set to be less than the rotational speed of transition from the constant torque region to the constant output area.

Next, as shown in FIG. 8, in the regeneration diffusion region A _rp , the motor torque T is _{equal to or higher than the regeneration basic torque threshold T q_r0} (corresponding to the regeneration basic current threshold i q_r0), and the motor rotation speed N is It is set as an operating point range that is equal to or greater than the basic lower limit rotation speed N_ _{r0_inf} during regeneration and less than or equal to the basic upper limit rotation speed N_ _{r0_up during regeneration.}

Here, in the case of the motor 2 mounted on the vehicle, the scene in which the motor 2 is in the regenerative state is mainly assumed to be when the vehicle is decelerating (particularly, just before the vehicle stops). Therefore, during regeneration, the noise heard by the occupant, such as the running noise of the vehicle, is relatively small as compared with the time of power running. Therefore, it is assumed that the occupant is more likely to perceive the noise caused by the increase in the ripple current during regeneration. In consideration of this point, in the present embodiment, the diffusion mode is executed in the range of the motor torque T lower than that during power running during regeneration. Therefore, the lower limit of the motor torque T in the regeneration diffusion region A _{rp (regeneration basic torque threshold T q_r0} ) is lower than the lower limit of the motor torque T in the power running diffusion region A _{dp (power running basic torque threshold T q_d0).} Set to a value.

_{That is, the regeneration basic current threshold i q_r0} used in the determination in step S132 of FIG. 5 is set to a value lower than the power running basic current threshold i _{q_d0.} In particular, as described above, when the motor 2 is mounted on a vehicle, the current flowing through the switching element 12 of the inverter 10 is smaller during regeneration (immediately before stopping) than during power running (running), so that switching is performed. There is little energy loss due to. Therefore, even if the lower limit of the motor torque T in the regeneration region A _rp is set lower than that in the power running diffusion region _Adp to widen the range of the motor torque T that executes the diffusion mode than in the power running region, the motor The decrease in energy efficiency of 2 can be relatively suppressed. That is, the regeneration diffusion region _Arp is defined as an operating point range (particularly, a motor torque T range) including at least a part of the above-mentioned energy suppression region C1.

On the other hand, in order to further suppress the decrease in energy efficiency, _{the lower limit of the motor torque T in the regeneration diffusion region Arp} does not substantially increase the ripple current that causes at least the level of noise perceived by the occupants of the vehicle. It is preferable to set it so as to exceed the low torque region.

Further, in the present embodiment, the _{basic lower limit rotation speed N_ r0_inf} and the basic upper limit rotation speed N_ _{r0_up} during regeneration, which define the lower limit and the upper limit of the motor rotation speed N _{in the regeneration diffusion region A rp} , respectively, are the power running diffusion region. _Set to substantially the same values as the basic lower limit rotation speed N_ _{d0_inf} during power running and the basic upper limit rotation speed N_ d0_up during power running in A _dp. However, depending on the application to which the switching device control system 200 of the present embodiment is applied, the motor rotation speed N that defines the _{diffusion region Adp} during power running is considered in consideration of the balance between the suppression of the ripple current and the suppression of the decrease in energy efficiency. The range of the motor rotation speed N that defines the range and the diffusion region A _rp during regeneration may be set to different ranges from each other.

According to the switching device control method of the present embodiment described above, the following effects are obtained.

According to the present embodiment, the inverter 10 as a switching device that converts the electric power from the battery 1 as a DC power source by PWM control and supplies it to the motor 2 as a rotary electric machine is controlled according to the operating point of the motor 2. A switching device control method for executing a diffusion mode (see FIG. 2) in which a carrier frequency of a carrier wave is changed at a predetermined switching cycle is provided.

In this switching device control method, during power running of the motor 2 (in the case of Yes in step S110 of FIG. 3), diffusion occurs when the operating point of the motor 2 is included _{in the power running diffusion region Adp set for power running.} Execute the mode (step S120, step S140, step S150, and step S160).

On the other hand, at the time of regeneration of the motor 2 (in the case of No in step S110 of FIG. 3), the diffusion mode is executed _{when the operating point of the motor 2 is included in the regeneration time diffusion region Arp set for the regeneration (regeneration).} Step S130, step S140, step S150, and step S160).

As a result, the diffusion mode can be executed in a more appropriate operating point range of the motor 2 at least during power running and during regeneration. In particular, in consideration of the difference between the scenes during power running and regeneration, the diffusion is preferably balanced between suppressing the increase in ripple current (suppression of noise) and suppressing the decrease in energy efficiency of the motor 2. The mode can be executed.

Further, according to the present embodiment, the operating point range of the motor 2 (basic lower limit rotation speed during power running N_ _{d0_inf} or basic lower limit rotation speed during regeneration) such that the calorific value of the inverter 10 exceeds the permissible value when the diffusion mode is executed. The heat generation region C2, which is the rotation speed region (rotation speed region less than _{N_ r0_inf), is set.} Then, at least one of the power running diffusion region _Adp and the regeneration diffusion region A _rp is set while avoiding the heat generation region C2 (FIGS. 7 and 8).

As a result, the diffusion mode can be executed while more reliably observing the heat resistance limitation of the inverter 10 while balancing the suppression of the increase in the ripple current and the suppression of the decrease in the energy efficiency as described above.

Further, according to the present embodiment, the energy suppression region C1 is set as an operating point range in which the suppression of the decrease in energy efficiency of the motor 2 is prioritized over the suppression of noise generated by the operation of the switching device during power running. Then, the diffusion region _Adp during power running is set while avoiding the energy suppression region C1 (see FIG. 7).

As a result, the diffusion mode can be executed while more preferably balancing between the suppression of noise and the suppression of the decrease in energy efficiency during power running.

Then, the regeneration diffusion region _Arp is set to include at least a part of the energy suppression region C1 (the range surrounded by the broken line in FIG. 7).

When the switching device control method of the present embodiment is applied to a traveling body such as a vehicle, as described above, even if the noise is at a level that cannot be perceived or noticed by the occupant during power running, it is during regeneration. Is expected to cause discomfort to the occupants. Further, during regeneration, the loss due to switching of the switching element 12 is smaller than that during power running.

In consideration of this point, the diffusion region A _rp during regeneration is set to include a part of the energy suppression region C1 that does not execute the diffusion mode during power running. More specifically, the minimum torque at the time of regeneration diffusion region A _rp (regenerative operation basic torque threshold _T q_r0), is set smaller than the lower limit torque during power running diffusion region A _dp (power running operation basic torque threshold _T q_d0) ( 7 and 8).

Thereby, the diffusion mode is executed so that the balance between the suppression of noise and the suppression of the decrease in energy efficiency of the motor 2 is more preferably maintained according to the respective scenes during power running and regeneration. Can be done.

Further, in the diffusion mode (both the power running diffusion mode and the regeneration diffusion mode) in the present embodiment, the voltage command value (dq voltage command value (v _d ^* , v _q ^{*) calculated as the value of the voltage to be applied to the motor 2 is calculated.} )) and the fundamental frequency F0 as twice the first frequency substantially matches the control cycle t of a second frequency that is an integral multiple of the first frequency spread frequency F1 (power running spread frequency F1_ _d and regeneration time spread frequency and F1_ _r), a set alternately.

As a result, it is possible to suppress a change in the difference (phase difference) between the timing of switching the carrier frequency and the timing of updating the voltage command value, and it is possible to preferably synchronize the carrier wave and the voltage command value. Therefore, in the inverter 10, it is possible to suppress a decrease in torque accuracy and the occurrence of torque ripple when switching the carrier frequency.

Further, in the present embodiment, there is provided a switching device control system 200 in which the above switching device control method is executed. In particular, the switching device control system 200 controls the switching device (inverter 10) that converts the electric power from the DC power supply (battery 1) by PWM control and supplies it to the rotary electric machine (motor 2), and the PWM control of the inverter 10. A device 100 is provided (FIG. 1). The control device 100 (particularly, the signal conversion unit 104) executes a diffusion mode (see FIG. 2) in which the carrier frequency of the carrier wave is changed in a predetermined switching cycle according to the operating point of the motor 2.

Then, the control device 100 diffuses when the operating point of the motor 2 is included _{in the power running diffusion region Adp} set for power running during power running of the motor 2 (in the case of Yes in step S110 of FIG. 3). It functions as a power running diffusion mode execution unit (step S120, step S140, step S150, and step S160) for executing the mode.

Further, the control device 100 diffuses when the motor 2 is regenerated (in the case of No in step S110 in FIG. 3) when the operating point of the motor 2 is included _{in the regeneration diffusion region Arp set for the regeneration.} It functions as a regeneration mode execution unit (step S130, step S140, step S150, and step S160) that executes the mode.

In particular, in the switching device control system 200, the inverter 10 includes a smoothing capacitor 15 arranged on the battery 1 side and a switching element 12 arranged on the motor 2 side. _{Further, the switching device control system 200 includes a current sensor 4 for detecting the current (three-phase current detection values (i ur} , i _vr , i _wr )) input from the inverter 10 to the motor 2, and a voltage (direct current) of the battery 1. Further includes a voltage sensor 16 for detecting a voltage V _{dc). Then, the control device 100 calculates a three-phase voltage command value (v u} ^* , v _v ^* , v _w ^* ) as a voltage command value based on the detection value of the current sensor 4 and the detection value of the voltage sensor 16. PWM signal generation that generates a PWM signal based on the command value calculation unit (current control unit 102 and dq / uvw conversion unit 103), the three-phase voltage command value (v _u ^* , v _v ^* , v _w ^{*) and the carrier.} A unit (signal conversion unit 104) is provided (see FIG. 1).

As a result, a suitable system configuration for executing the switching device control method of the present embodiment is realized.

[Second Embodiment]
Hereinafter, the second embodiment will be described. The same elements as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the present embodiment, the carrier frequency switching cycle (first switching time t ₂₁ _ _d during power running or second switching time t ₂₂ _ _d during power running) and the diffusion mode during regeneration are set when the power running diffusion mode is set. The carrier frequency switching cycle (first switching time t ₂₁ _ _r during regeneration or second switching time t ₂₂ _ _r during regeneration) is changed according to the operating point of the motor 2.

More specifically, the control device 100 sets the second switching time t ₂₂ _ _d during power running and the second switching time t ₂₂ _ _r during regeneration, which are the times for maintaining a relatively high carrier frequency, as the operating points of the motor 2. Change in stages accordingly.

In particular, in the present embodiment, a plurality of divided regions according to the magnitude of the ripple current (noise) are set in advance in _{the power running diffusion region Adp} and the regeneration diffusion region _{Arp. Then, the second switching time t 22} _ _d during power running and the second switching time t ₂₂ _ _r during regeneration are changed according to whether the operating point of the motor 2 is included in the plurality of divided regions.

_{More specifically, in the present embodiment, the second switching time t 22} _ during power running depends on which division region in the _{diffusion region Adp} during power running includes the q-axis current detection value i _qr and the motor rotation speed N. _d is switched between the basic time t0, the first time t1, and the second time t2. Further, depending on which division region in the _{diffusion region A rp} during regeneration includes the q-axis current detection value i _qr and the motor rotation speed N _{, the second switching time t 22} _ _r during regeneration is set to the first time t1, And switch between the second time t2. The relationship of t0 <t1 <t2 is established between the basic time t0, the first time t1, and the second time t2.

FIG. 9 is a flowchart illustrating a process of changing _{the second switching time t 22} _ _d during power running according to the operating point of the motor 2 during power running.

As shown, the control device 100, in accordance with respective determination results of step S210~ step S240, changes the second switching time power running t ₂₂ _ _d.

More specifically, in the control device 100, the q-axis current detection value i _qr is less than the first current threshold i _{q_d1} during power running, or the motor rotation speed N is _{less than the first lower limit rotation speed N_ d1_inf} during power running or the first upper limit during power running. When it is determined that the rotation speed N_ _{d1_up} is exceeded (when step S210 or step S220 is No determination), the second switching time t ₂₂ _ _d during power running is set to the basic time t0 (step S270).

Further, in the control device 100, when the determination results in steps S210 and S220 are both positive, the q-axis current detection value i _{qr is equal to} or higher than the second current threshold i q_d2 during power running, or the motor rotation speed N. _{When it is determined that is} less than the second lower limit rotation speed N_ d2_inf during power running or exceeds the second upper limit rotation speed N_ _{d2_up} during power running (when step S230 or step S240 is No determination), the second switching time t ₂₂ _ during power running. _d is set to the first time t1 (step S260).

Furthermore, the control device 100, the decision result in the step S210~ step S240 is if all positive, sets the second switching time power running t ₂₂ _ _d in the second time t2 (step S250).

FIG. 10 is a flowchart illustrating a process of changing _{the second switching time t 22} _ _r at the time of regeneration according to the operating point of the motor 2 at the time of regeneration.

_{As shown in the figure, the control device 100 changes the second switching time t 22} _ _r at the time of regeneration according to the determination results of step S310 and step S320.

More specifically, in the control device 100, the q-axis current detection value i _qr is less than the first current threshold i _{q_r1} at the time of regeneration, or the motor rotation speed N is _{less than the first lower limit rotation speed N_ r1_inf} at the time of regeneration or the first at the time of force regeneration. When it is determined that the upper limit rotation speed N_ _{r1_up} is exceeded (when step S310 or step S320 is No determination), the second switching time t ₂₂ _ _r at the time of regeneration is set to the first time t1 (step S340).

On the other hand, the control device 100, when the determination result of step S310 and step S320 are both positive, sets the second switching time during regeneration t ₂₂ _ _r the second time t2 (step S330).

Next, the technical significance of changing _{the second switching time t 22} _ _d during power running and the second switching time t ₂₂ _ _r during regeneration according to the operating point of the motor 2 will be described.

FIG. 11 is a map for explaining the operating point range corresponding to the divided region for changing _{the second switching time t 22} _ _d during power running in the power running _{diffusion region Adp.} Further, FIG. 12 is a map for explaining the operating point range corresponding to the divided region for changing _{the second switching time t 22} _ _r at the time of regeneration in the _{diffusion region at the time of regeneration A rp.} In FIG. 12, the positive and negative axes of the vertical axis and the horizontal axis are reversed for convenience from the viewpoint of representing the motor torque T (<0) and the motor rotation speed N (<0) at the time of regeneration.

The maps shown in FIGS. 11 and 12 are determined in advance by experiments or the like, and are stored in a memory (not shown) in the control device 100 or a storage area of an arbitrary device that the control device 100 can communicate with in order to acquire the map. It will be saved.

First, as shown in FIG. 11, the power running when the diffusion region A _dp, as a plurality of divided areas defining the operating point of the motor 2 in accordance with the magnitude of the noise, the basic power running during diffusion region A _dp0, first powering The time diffusion region _Adp1 and the second power running diffusion region _Adp2 are set.

Here, the basic power running diffusion region A _dp0 is the operating point range of the motor 2 in which the second switching time t ₂₂ _ _{d during power running should be set to the basic time t0.} The first power running diffusion region A _dp1 is the operating point range of the motor 2 in which the second power running switching time t ₂₂ _ _{d should be set to the first time t1.} The second power running diffusion region A _dp2 is the operating point range of the motor 2 in which the second power running switching time t ₂₂ _ _{d should be set to the second time t 2.}

Thus, in this embodiment, during power running diffusion region A _dp basic power running diffusion region A _dp0 defining three operating points range noise becomes gradually large, first powering time diffusion region A _dp1, and a second powering _{The second switching time t 22} _ _d during power running, which is divided into the time diffusion region A _dp2 and maintains the power running diffusion frequency F1_ _d, is set to be gradually lengthened in this order.

On the other hand, as shown in FIG. 12, in the regeneration process diffusion region A _rp, as a plurality of divided areas defining the operating point of the motor 2 in accordance with the magnitude of the noise, the first powering time diffusion region A _dp1, and the _{The diffusion region Adp2} at the time of two power running is set. Therefore, the diffusion region A _rp during regeneration is divided into two operating point ranges in which noise gradually increases, and the second switching time t ₂₂ _ _{r during regeneration in which the diffusion frequency F1_ r} during regeneration is maintained is in this order. It will be set to be gradually lengthened.

According to the switching device control method of the present embodiment described above, the following effects are obtained.

According to the switching device control method of the present embodiment, a plurality of divided regions according to the strength of noise generated by the switching operation in the inverter 10 are set in _{the power running diffusion region Adp} and the regeneration diffusion region _Arp. (FIGS. 11 and 12). Then, depending on whether the operating point of the motor 2 is contained in any of a plurality of divided regions, the switching time of the carrier frequency (second switching time power running t ₂₂ _ _d and during regeneration the second switching time t ₂₂ _ _r ) is changed (FIGS. 9 and 10).

As a result, when the diffusion mode is executed during both power running and regeneration, the second switching time t during power running according to the change in noise intensity (noise sound amplitude or frequency, etc.) according to the change in the operating point. ₂₂ _ _d or the second switching time t ₂₂ _ _r at the time of regeneration can be adjusted. That is, it is possible to realize a more appropriate switching frequency from the viewpoint of suppressing the noise according to the strength of the noise.

In this embodiment, an example has been described in _{which the powering diffusion region Adp} is divided into three divided regions and the regenerative diffusion region _{Arp is divided into two divided regions according to the noise intensity.} However, the present invention is not limited to this, and the power running diffusion region _Adp and the regeneration diffusion region A _rp may be appropriately divided into an arbitrary number of divided regions.

In particular, the number of the divided regions is such that the carrier frequency switching cycle can be changed stepwise from the viewpoint of alleviating the discomfort of a person listening to the noise according to the physical quantity such as the frequency that characterizes the generated noise. And it is preferable to set the operating point range. Thereby, for example, when the switching device control method of the present embodiment is applied to a vehicle, an execution mode of a diffusion mode capable of further reducing the discomfort given to the occupant due to noise is realized.

[Third Embodiment]
Hereinafter, the third embodiment will be described. The same elements as those in the first embodiment or the second embodiment are designated by the same reference numerals, and the description thereof will be omitted. _{In this embodiment, in particular, the setting of the power running diffusion region Adp} when the external circuit 30 is attached to the power supply system (battery 1, inverter 10, and motor 2) in the switching device control system 200 will be described.

FIG. 13 is a diagram illustrating a configuration of a power supply system to which an external circuit 30 is attached. Further, FIG. 14 is a diagram showing an equivalent circuit 40 of the power supply system.

As shown, the external circuit 30 is connected in parallel between the battery 1 and the inverter 10. In particular, in the present embodiment, the external circuit 30 is composed of a vehicle accessory circuit 30a such as a vehicle accessory or another inverter, and a filter circuit 30b that protects the vehicle accessory circuit 30a. In addition, such an external circuit 30 may be retrofitted to the power supply system.

In the equivalent circuit 40 of FIG. 14, a series circuit 41 consisting of a battery 1, a resistor 42, and an inductor 43 is arranged in the center, and the right side circuit 44 and the left side circuit 49 are connected in parallel to the series circuit 41.

The right circuit 44 is, for example, a circuit on the inverter 10 side, in which a parallel circuit of the capacitor 47 (smoothing capacitor 15) and the current source 48 is connected in series to the series circuit of the resistor 45 and the inductor 46.

The left circuit 49 is, for example, a circuit on the external circuit 30 side, in which a parallel circuit of the capacitor 52 (filter circuit 30b) and the current source 53 is connected in series to the series circuit of the resistor 50 and the inductor 51.

As described above, the ripple voltage is generated in the inverter 10. Therefore, in FIG. 14, the ripple current loops in the right circuit 44 and the series circuit 41, but the ripple voltage is reduced by the capacitor 47 (smoothing capacitor 15) smoothing the ripple voltage.

The equivalent circuit 40 is a coupling circuit with the series circuit 41, the right side circuit 44, and the left side circuit 49. Here, when the frequency of the ripple current component of the sideband wave of the carrier (basic frequency F0) is close to the resonance frequency of the coupling circuit (resonance frequency of resonance in the LCR circuit), the ripple current is the equivalent circuit 40. It is expected to be amplified as a whole.

On the other hand, in the present embodiment, the operating point range for generating the ripple current component of the sideband wave having a frequency close to the resonance frequency of the coupling circuit is set in advance during power running, and this is set as the power running diffusion region _Adp. do.

FIG. 15 is a map showing an operating point range that defines the _{power running diffusion region Adp in the present embodiment.}

As shown, during power running diffusion region A _dp of the present embodiment, in addition to the areas shown in FIG. 7 or 11, further being set to include a third power running diffusion region A _dp3. In particular, the third power running diffusion region _Adp3 is set to a rotation speed region higher than the energy suppression region C1.

Therefore, in the present embodiment, the control device 100 has a diffusion mode when the operating point of the motor 2 is included in the region shown in FIG. 7 or 11, and also when it is included in the third power running diffusion region _Adp3. To execute.

Hereinafter, the action and effect of setting the diffusion mode when the operating point is included in the third power running diffusion region _{Adp3 will be described.}

FIG. 16 shows the frequency spectrum of the ripple current when the external circuit 30 is attached. In particular, FIG. 16A shows the frequency spectrum of the ripple current when the third power running diffusion region _{Adp3 is set. Further, FIG. 16B} shows a frequency spectrum of the ripple current when the third power running diffusion region Adp3 is not set.

As shown in FIG. 16B, when the frequency of the ripple current component of the sideband wave is close to the resonance frequency (particularly F0) of the coupling circuit due to the attachment of the external circuit 30 to the inverter 10, the ripple current The component is amplified.

On the other hand, in the present embodiment, _{by setting the third power running diffusion region Adp3} , the diffusion mode is executed in the operating point range in which the ripple current component of the sideband wave having a frequency close to the resonance frequency of the coupling circuit is generated. I try to do it. Therefore, as shown in FIG. 16A, the ripple current component having a frequency close to the resonance frequency of the coupling circuit is further reduced.

According to the switching device control method of the present embodiment described above, the following effects are obtained.

In the present embodiment, the difference between the power running diffusion region _Adp and the resonance frequency of the coupling circuit (equivalent circuit 40) composed of the inverter 10 and the external circuit 30 connected to the inverter 10 is equal to or less than a predetermined value. _{The third power running diffusion region Adp3} is included as the operating point range in which the ripple current component of the frequency is generated.

As a result, when an external circuit 30 such as a filter circuit 30b is connected to the inverter 10, the diffusion mode is used so as to more reliably suppress the amplification of the ripple current due to the electrical resonance of the coupling circuit including the inverter 10 and the external circuit 30. Can be executed.

In this embodiment, an example in which _{the third power running diffusion region Adp3} is set as the operating point range in which the diffusion mode should be executed in consideration of resonance when the external circuit 30 is connected to the inverter 10 during power running. explained. On the other hand, even at the time of regeneration, the operating point range in which the diffusion mode should be executed may be set in consideration of the resonance when the external circuit 30 is connected to the inverter 10 in the same manner.

[Fourth Embodiment]
Hereinafter, the fourth embodiment will be described. The same elements as those in the first to third embodiments are designated by the same reference numerals, and the description thereof will be omitted. In the fourth embodiment, in any of the switching device control methods of the first to third embodiments, the hysteresis determination is executed when switching from the state in which the diffusion mode is executed to the normal mode.

FIG. 17 is a flowchart illustrating a switching device control method according to the fourth embodiment. The processing of steps S110 to S140 and step S150 is the same as that of the first embodiment.

On the other hand, in the present embodiment, when the control device 100 determines that the operating point of the motor 2 _{is not included in either the power running diffusion region Adp or the} regeneration diffusion region A _rp (in the case of No in step S140), the step The hysteresis determination of S141 is executed.

Specifically, the control device 100 defines the motor torque T and the motor that define the boundary between _{the power running diffusion region Adp} (or the regeneration time diffusion region A _rp ) and the power running normal region A _db (or the regeneration normal region A _rb). Based on the comparison between the threshold value obtained by giving a hysteresis width to the value of the rotation speed N (for example, the basic current threshold i _{q_d0} during power running and the basic lower limit rotation speed N_ _{d0_inf during power running) and the current operating point of the motor 2.} It is determined whether or not to switch from the diffusion mode to the normal mode (step S142).

Then, when the control device 100 determines that the operating point exceeds the threshold value provided with the hysteresis width and is included in the region on the normal mode side, the process proceeds to step S160, and the diffusion mode is switched to the normal mode. If the normal mode is already set, this is maintained as it is. On the other hand, if the determination result in step S142 is negative, the control device 100 returns the process to step S140.

As described above, by executing the hysteresis determination at the time of determining the switching from the diffusion mode to the normal mode, the chattering that occurs at the time of the switching can be suppressed.

Although the embodiments of the present invention have been described above, each of the above embodiments shows only a part of the application examples of the present invention, and the purpose is to limit the technical scope of the present invention to the specific configuration of the above embodiments. is not it.

For example, in each of the above embodiments, the motor torque T (q-axis current detection value i _qr ) and the motor rotation speed N are set within a predetermined range (diffusion region _Adp during power running or diffusion region A _{rp during regeneration) as the operating point of the motor 2.} An example of executing the diffusion mode when it is included has been described. However, the present invention is not limited to this, and a range in which the diffusion mode should be executed is set for any parameter that can specify an operating point other than the motor torque T and the motor rotation speed N, and the range is set as the execution reference of the diffusion mode. Is also good.

Examples of such parameters include a current command value, a d-axis current, and a modulation factor Mf. In particular, the modulation factor Mf may be further used as a parameter for defining the diffusion region (powering diffusion region _Adp or regeneration diffusion region _{Arp) described in each of the above embodiments.} In particular, since the modulation factor Mf correlates with the motor rotation speed N in the low to medium load region, it can be used in place of or together with the motor rotation speed N as a parameter that defines the diffusion region.

In addition, each of the above embodiments can be arbitrarily combined within a consistent range.

1 Battery 4 Current sensor 5 Resolver 10 Inverter 11 Switching circuit 12 Switching element 15 Smoothing capacitor 16 Voltage sensor 30 External circuit 100 Control device 101 Current command value calculation unit 102 Current control unit 103 dq / uvw conversion unit 104 Signal conversion unit 105 uvw / dq conversion unit 106 Motor position calculation unit 200 Switching device control system

Claims (9)

Switching that controls a switching device that converts power from a DC power supply by PWM control and supplies it to a rotary electric machine, and executes a diffusion mode that changes the carrier frequency of the carrier wave in a predetermined switching cycle according to the operating point of the rotary electric machine. It is a device control method
During power running of the rotary electric machine, the diffusion mode is executed when the operating point of the rotary electric machine is included in the power running diffusion region set for power running.
At the time of regeneration of the rotary electric machine, the diffusion mode is executed when the operating point of the rotary electric machine is included in the regeneration time diffusion region set for regeneration.
Switching device control method. The switching device control method according to claim 1.
A heat generation region, which is an operating point range in which the heat generation amount of the switching device exceeds the permissible value when the diffusion mode is executed, is set.
At least one of the power running diffusion region and the regeneration diffusion region is set while avoiding the heat generation region.
Switching device control method. The switching device control method according to claim 1 or 2.
An energy suppression region is set as an operating point range in which the suppression of the decrease in energy efficiency of the rotary electric machine is prioritized over the suppression of noise generated by the operation of the switching device during power running.
The power running diffusion region is set while avoiding the energy suppression region.
Switching device control method. The switching device control method according to claim 3.
The regeneration diffusion region is set to include at least a part of the energy suppression region.
Switching device control method. The switching device control method according to any one of claims 1 to 4.
A plurality of divided regions according to the magnitude of noise generated by the operation of the switching device are set in at least one of the power running diffusion region and the regeneration diffusion region.
The switching time of the carrier frequency is changed according to which of the plurality of divided regions the operating point of the rotary electric machine is included in.
Switching device control method. The switching device control method according to any one of claims 1 to 5.
The diffusion region during power running
The operating point range includes a ripple current component having a frequency at which the difference is equal to or less than a predetermined value with respect to the resonance frequency of the switching device and the coupling circuit composed of the external circuit connected to the switching device.
Switching device control method. The switching device control method according to any one of claims 1 to 6.
In the diffusion mode,
The first frequency, which substantially coincides with twice the control cycle of the voltage command value calculated as the value of the voltage to be applied to the rotary electric machine, and the second frequency, which is an integral multiple of the first frequency, are alternately set.
Switching device control method. A switching device that converts electric power from a DC power source and supplies it to a rotary electric machine and a control device that performs PWM control on the switching device are provided, and the control device has a carrier wave according to an operating point of the rotary electric machine. A switching device control system that executes a diffusion mode in which the carrier frequency is changed in a predetermined switching cycle.
The control device is
During power running of the rotary electric machine, a power running diffusion mode execution unit that executes the diffusion mode when the operating point of the rotary electric machine is included in the power running diffusion region set for power running.
In the regeneration of the rotary electric machine, the regeneration time diffusion mode execution unit that executes the diffusion mode when the operating point of the rotary electric machine is included in the regeneration time diffusion region set for the regeneration time is included.
Switching device control system. The switching device control system according to claim 8.
The switching device includes a smoothing capacitor arranged on the DC power supply side and a switching element arranged on the rotary electric machine side.
Further including a current sensor for detecting a current input from the switching device to the rotary electric machine and a voltage sensor for detecting the voltage of the DC power supply.
The control device is
A voltage command value calculation unit that calculates a voltage command value based on the detection value of the current sensor and the detection value of the voltage sensor, and a voltage command value calculation unit.
A PWM signal generation unit that generates a PWM signal based on the voltage command value and the carrier wave is provided.
Switching device control system.

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