CN111527690A - Motor control device - Google Patents

Motor control device Download PDF

Info

Publication number
CN111527690A
CN111527690A CN201880084240.0A CN201880084240A CN111527690A CN 111527690 A CN111527690 A CN 111527690A CN 201880084240 A CN201880084240 A CN 201880084240A CN 111527690 A CN111527690 A CN 111527690A
Authority
CN
China
Prior art keywords
power supply
battery
supply voltage
motor
motor control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201880084240.0A
Other languages
Chinese (zh)
Inventor
初田匡之
奥畑佳久
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Corp
Original Assignee
Nidec Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nidec Corp filed Critical Nidec Corp
Publication of CN111527690A publication Critical patent/CN111527690A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53875—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/007—Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/13—Maintaining the SoC within a determined range
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/20—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having different nominal voltages
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/42—Drive Train control parameters related to electric machines
    • B60L2240/423—Torque
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The motor control device includes: an inverter circuit that supplies a drive voltage to the motor; and a control unit that supplies a power supply voltage from a 1 st power supply to the inverter circuit when a torque instruction value supplied from an external source is less than a predetermined threshold value, and supplies a power supply voltage from a 2 nd power supply to the inverter circuit when the torque instruction value is equal to or greater than the predetermined threshold value, the 1 st power supply supplying the 1 st power supply voltage, the 2 nd power supply supplying a power supply voltage higher than the 1 st power supply voltage.

Description

Motor control device
Technical Field
The present invention relates to a motor control device for controlling driving of a motor.
Background
A technique is known in which driving power of a motor as motive power of a vehicle or the like is controlled using an inverter circuit.
For example, patent document 1 discloses a power conversion system having a plurality of batteries, and discloses a parallel boosting technique for boosting voltages in parallel in the plurality of batteries.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016-
Disclosure of Invention
Problems to be solved by the invention
However, in the technique disclosed in patent document 1, since a booster circuit is required for each of the plurality of batteries, the entire system of the motor is increased in size.
In view of the above-described problems, an object of the present invention is to provide a motor control device capable of supplying an appropriate power supply voltage corresponding to a torque instruction value to an inverter circuit and contributing to downsizing of a motor.
Means for solving the problems
In order to solve the above problem, according to one aspect of the present invention, there is provided a motor control device including: an inverter circuit that supplies a drive voltage to the motor; and a control unit that supplies a power supply voltage from a 1 st power supply to the inverter circuit when a torque instruction value supplied from an external source is less than a predetermined threshold value, and supplies a power supply voltage from a 2 nd power supply to the inverter circuit when the torque instruction value is equal to or greater than the predetermined threshold value, the 1 st power supply supplying the 1 st power supply voltage, the 2 nd power supply supplying a power supply voltage higher than the 1 st power supply voltage.
Effects of the invention
According to the present invention having the above configuration, the power supply voltage supplied to the inverter circuit is changed depending on whether or not the torque instruction value is less than the predetermined threshold value, whereby an appropriate power supply voltage corresponding to the torque instruction value can be supplied to the inverter circuit, and a booster circuit or the like does not need to be provided, and therefore, it is possible to contribute to downsizing of the motor.
Drawings
Fig. 1 is a block diagram showing a configuration example of a motor control device according to embodiment 1 of the present invention.
Fig. 2 is a diagram showing a relationship among power consumption of the motor, a rotation speed N of the motor, and a torque T.
Fig. 3 is a flowchart showing an example of switching control of the battery.
Fig. 4 is a flowchart showing an example of power conversion control between batteries.
Fig. 5 is a diagram showing an example of a change in the state of charge of the battery.
Fig. 6 is a flowchart showing an example of power conversion control between batteries.
Fig. 7 is a diagram showing an example of a change in the state of charge of the battery.
Fig. 8 is a flowchart showing an example of power conversion control between batteries.
Detailed Description
Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
< embodiment >
Fig. 1 is a block diagram showing a configuration example of a motor control device according to an embodiment.
The motor control device comprises: a motor controller 2 that controls a motor 30 that outputs driving force to a vehicle or the like; a VCU (Vehicle Control Unit) 3 that outputs a torque command (torque instruction value) according to a state of the Vehicle; and an inverter 21 that generates a drive voltage in accordance with control from the motor controller 2. In addition, the motor control device has a switching circuit 50, which is provided with a switching circuit50 supply the inverter 21 by switching the power supply voltages of the battery 4a and the battery 4b in accordance with the power supply voltage (request voltage) requested from the inverter 21, wherein the battery 4a supplies the direct-current power supply voltage (1 st power supply voltage V)BATT1) The battery 4b provides a voltage V higher than the 1 st power supply voltageBATT1High 2 nd supply voltage VBATT2. Since the battery 4b is used for a short time when the torque instruction value is equal to or greater than the predetermined threshold value during acceleration or the like, the capacity of the battery 4b is, for example, one twentieth or less of that of the battery 4a used during normal running.
The motor control device further includes: a battery controller 5 that controls the State of Charge (SoC) of the batteries 4a and 4 b; a DCDC converter (power converter) 40 that performs power conversion between the battery 4a and the battery 4b in accordance with control from the battery controller 5; and a temperature sensor 6 that detects the temperature around the motor 30, the temperature of the refrigerant that cools the motor 30, and the like. The DCDC converter unit 40 includes a bidirectional DCDC converter capable of performing both step-down and step-up operations.
The motor 30 is constituted by, for example, a brushless motor having a rotor provided to be rotatable about a rotation shaft having an output end, a stator having field coils 31u, 31v, 31w and the like that generate a magnetic field by a drive current corresponding to a drive voltage of three phases, and a housing that houses the rotor, the stator, and the like. A permanent magnet is attached to a rotor that rotates around a rotation shaft of the rotor in accordance with a magnetic field generated by an excitation coil, and a driving force is output from one end (output end) of the rotation shaft.
The motor 30 is provided with a position sensor 32 for detecting the angle of the rotor and a temperature sensor 33 for detecting the temperature of the motor 30. The position sensor 32 includes, for example, magnetic sensors such as 3 hall elements arranged around the rotor at intervals of 120 ° to detect the magnetism of the rotor, and the position sensor 32 detects the angle of the rotor. The angle of the rotor may be detected by another member such as a rotary encoder. The temperature sensor 33 has a temperature detection element such as a thermistor, detects the temperature of the motor 30 such as an excitation coil, and supplies the detected temperature to the inverter 21.
The VCU 3 generates a torque command (torque instruction value) indicating a value of a required torque based on a current throttle opening, a vehicle speed, an acceleration at the time of acceleration or deceleration, or other vehicle state, and supplies the torque command to the motor controller 2. The motor controller 2 controls the operation of the inverter 21 based on the torque instruction value.
The inverter 21 includes: a control unit 21b that controls the operation of the entire inverter 21 according to control from the motor controller 2; an Insulated Gate Bipolar Transistor (IGBT) module 21a that generates three-phase drive voltages by switching a voltage V supplied from the switching circuit 50 in accordance with an instruction from the control unit 21 b; and a temperature sensor 21c that detects the temperature of the IGBT21a and the like. The IGBT21a has 3 sets of 6 switching elements (IGBT elements) to generate a drive voltage of three phases. In place of the IGBT element, a switching element such as a MOSFET (Metal oxide semiconductor Field Effect Transistor) may be used.
The control unit 21b detects the angle of the rotor based on the detection voltage of the position sensor 32, for example. The control unit 21b detects the rotation speed of the motor 30 based on the voltage detected by the position sensor 32. Alternatively, the rotation speed of the motor may be detected by a sensor different from the position sensor 32.
The control section 21b calculates necessary electric power required to drive the motor based on the control from the motor controller 2 and the detected rotation speed of the motor 30. The relationship between the rotation speed N and the torque T of the motor 30 changes according to the power consumption of the motor 30 as shown in fig. 2, for example. The relationship between the rotation speed N and the torque T of the motor 30 is, for example, as indicated by a solid line in fig. 2 when the power consumption is 80kW, and as indicated by a broken line when the power consumption is 120 kW. Therefore, the control unit 21b calculates, as the necessary electric power, power consumption that can obtain the required torque from the control from the motor controller 2 and the rotation speed of the motor 30 based on such a relationship.
The control unit 21b controls the operation of the inverter 21 based on the calculated necessary power. Specifically, when the necessary power is less than a predetermined thresholdWhen the value is equal, the control unit 21b supplies the power supply voltage V of the battery 4a to the inverter 21BATT1Provides the switching circuit 50 with the requested voltage. When the required power is equal to or higher than the predetermined threshold, the control unit 21b supplies the inverter 21 with the power supply voltage V of the battery 4bBATT2Provides the switching circuit 50 with the requested voltage. That is, the control unit 21b controls the operation of the switching circuit 50 so that the power supply voltage of any of the battery 4a and the battery 4b is supplied to the inverter 21, based on the necessary electric power calculated based on the control corresponding to the torque instruction value and the like from the motor controller 2. Since the necessary electric power is a value corresponding to the torque instruction value, in other words, the control unit 21b controls the operation of the switching circuit 50 so that an appropriate power supply voltage is supplied to the inverter 21, depending on whether or not the torque instruction value is less than a predetermined threshold value.
The switching circuit 50 includes a controller 51 that controls the operation of the entire switching circuit 50, a switching element Tr11 connected to the battery 4b, a regeneration diode D11 connected to the switching element Tr11, switching elements Tr21 and Tr22 connected to the battery 4a, a regeneration diode D21 connected to the switching element Tr21, and a regeneration diode D22 connected to the switching element Tr 22. In fig. 1, the switching elements Tr11, Tr21, and Tr22 are represented as IGBT elements, but switching elements such as MOSFETs may be used. The regeneration diodes D11, D21, and D22 are provided to supply the electric power supplied from the motor 30 via the inverter 21 to the batteries 4a and 4b during deceleration or the like.
When the power supply voltage V of the battery 4a is supplied to the inverter 21BATT1At this time, the controller 51 turns off the switching element Tr11 and turns on the switching elements Tr21 and Tr 22. In addition, the power supply voltage V of the battery 4b is supplied to the inverter 21BATT2At this time, the controller 51 turns on the switching element Tr11 and turns off the switching elements Tr21 and Tr 22.
The control unit 21b calculates the current value I from the necessary power obtained as described above and the power supply voltage from the switching circuit 50. Then, the control unit 21b controls the switching of each switching element of the IGBT21a based on the detected rotation angle of the rotor and the calculated current value I to generate three-phase (U-phase, V-phase, and W-phase) drive voltages (drive signals). For example, in the case of sinusoidal drive, the drive voltage is generated by performing PWM (Pulse Width Modulation) control so that an effective value (hereinafter, simply referred to as a current value) of the drive current flowing through the exciting coils 31u, 31v, and 31w of the motor 30 becomes the calculated current value I. Specifically, the control unit 21b changes the PWM modulation degree according to the current value I.
The drive voltage generated by the IGBT21a is supplied to the field coils 31u, 31v, and 31w of the stator of the motor 30, a drive current corresponding to the drive voltage flows through the field coils, and a torque is generated in the rotor by the interaction between the magnetic field generated by the field coils and the permanent magnets of the rotor. The torque is output to the outside via the output end of the rotor.
(Battery switching control)
Fig. 3 is a flowchart showing a control process of the motor in the motor control device. The control unit 21b obtains necessary power obtained by control corresponding to a torque instruction value or the like from the motor controller 2, and controls the operation of the switching circuit 50 so that the power supply voltage of any of the battery 4a and the battery 4b is supplied to the inverter 21, depending on whether or not the necessary power is less than a predetermined threshold value. As described above, since the required electric power is a value corresponding to the torque instruction value, the following description will be made: the control unit 21b controls the operation of the switching circuit 50 so that the power supply voltage of any of the battery 4a and the battery 4b is supplied to the inverter 21, based on whether or not the torque instruction value is less than a predetermined threshold value.
First, the control unit 21b supplies the power supply voltage V of the battery 4a to the switching circuit 50BATT1As the requested voltage. Accordingly, the controller 51 turns off the switching element Tr11 and turns on the switching elements Tr21 and Tr22 (S1). Thereby, the power supply voltage V of the battery 4a is adjustedBATT1Is supplied to the inverter 21.
Next, the control section 21b determines the torque instruction value TAnd (S2) whether or not the threshold value is not less than a predetermined threshold value Tth. If the torque instruction value T is less than the predetermined threshold value Tth, the control unit 21b continues the operation of S2 (monitoring the torque instruction value). If the torque instruction value T is not less than a predetermined threshold value Tth, the control section 21b supplies the power supply voltage V of the battery 4b to the switching circuit 50BATT2As the requested voltage. Accordingly, the controller 51 turns on the switching element Tr11 and turns off the switching elements Tr21 and Tr22 (S3). Thereby, the power supply voltage V of the battery 4b is adjustedBATT2Is supplied to the inverter 21.
Then, the control unit 21b determines whether or not the torque instruction value T is less than a predetermined threshold value Tth (S4). If the torque instruction value T is less than the predetermined threshold value Tth, the control unit 21b returns to S1. If the torque instruction value T is equal to or greater than the predetermined threshold value Tth, the control unit 21b continues the operation of S4 (monitoring the torque instruction value).
By performing the control as described above, the power supply voltage supplied to the inverter 21 can be appropriately changed depending on whether or not the torque instruction value is less than the predetermined threshold value. Thus, for example, when a torque is required during acceleration and the torque instruction value is equal to or greater than a predetermined threshold value, the inverter 21 is supplied with the power supply voltage of the battery 4b having a higher power supply voltage than the battery 4a, and the necessary power required to drive the motor 30 can be increased. Further, since the battery 4a and the battery 4b are switched to supply the power supply voltage, it is not necessary to provide a booster circuit or the like, and it is possible to contribute to downsizing of the motor.
The predetermined threshold value Tth may be set in advance, but may be set in response to an input from a user. For example, an input unit such as a switch for a user to input an instruction (information indicating a threshold value) of the user to place importance on acceleration, power consumption, and the like is provided, and the control unit 21b sets the threshold value Tth in accordance with the instruction from the user. This enables coping with a plurality of traveling situations corresponding to the instruction of the user. The control unit 21b may change the threshold value Tth in accordance with a change in the torque instruction value (a change in the required power). For example, when the traveling load is higher than that in traveling on a flat ground or the like, such as traveling on a mountain road or an expressway, the reaction can be improved by lowering the threshold value Tth.
(electric Power conversion control)
In addition, in this motor control device, power is converted from one of the batteries to the other battery according to the State of charge (SoC) of the batteries 4a and 4 b. The battery 4b is used for acceleration or the like, but has a smaller capacity (for example, about one twentieth) than the battery 4a, and therefore, may be insufficiently charged when acceleration or the like ends. Therefore, the battery controller 5 monitors the state of charge of the battery 4b, and when the state of charge (SoC2) of the battery 4b becomes less than a predetermined threshold value (Th1, for example, 80%), the DCDC converter 40 boosts the power supply voltage of the battery 4a to charge the battery 4 b.
Specifically, for example, as shown in fig. 4, the battery controller 5 determines whether or not the state of charge SoC2 of the battery 4b becomes less than the threshold Th1 in a state where the charging of the battery 4b is stopped (S11) (S12). When the state of charge SoC2 of the battery 4b becomes less than the threshold Th1, the battery controller 5 boosts the power supply voltage of the battery 4a by the DCDC converter unit 40 to charge the battery 4b (S13). If the state of charge SoC2 of the battery 4b is equal to or greater than the threshold Th1, the battery controller 5 continues the state in which charging is stopped (S11).
While the battery 4b is being charged, the battery controller 5 determines whether or not the state of charge SoC2 of the battery 4b is equal to or greater than a threshold Th1 (S14). If the state of charge SoC2 of the battery 4b is less than the threshold Th1, the battery controller 5 continues the charging of the battery 4b (S13). If the state of charge SoC2 of the battery 4b is equal to or greater than the threshold Th1, the battery controller 5 stops charging of the battery 4b (S11).
By performing the above control, the state of charge SoC2 of the battery 4b can be appropriately managed.
For example, as shown in fig. 5, when the power supply voltage of the battery 4b is supplied to the inverter 21 by acceleration or the like during a period from time t1 to t2, the state of charge SoC2 of the battery 4b decreases, but when the acceleration or the like ends, the battery 4b is charged from the battery 4a via the DCDC conversion unit 40 under the control of the battery controller 5, and therefore, the state of charge SoC2 of the battery 4b is restored to the threshold Th1(t 3).
When the power supply voltage of the battery 4b is supplied to the inverter 21, the electric power supplied from the motor 30 via the inverter 21 is supplied to the battery 4b via the regenerative diode D11 during deceleration or the like, and therefore, the battery may be overcharged (may not be charged by regeneration) depending on a running state or the like. Therefore, in this motor control device, the battery controller 5 monitors the state of charge of the battery 4b, and when the state of charge (SoC2) of the battery 4b becomes equal to or greater than a predetermined threshold value (Th2, for example, 95%), the DCDC converter 40 lowers the power supply voltage of the battery 4b, thereby charging the battery 4 a.
Specifically, for example, as shown in fig. 6, the battery controller 5 determines whether or not the state of charge SoC2 of the battery 4b is equal to or greater than the threshold Th2 in a state where the charging of the battery 4a is stopped (S21) (S22). When the state of charge SoC2 of the battery 4b is equal to or greater than the threshold Th2, the battery controller 5 lowers the power supply voltage of the battery 4b by the DCDC converter unit 40 to charge the battery 4a (S23). If the state of charge SoC2 of the battery 4b is less than the threshold Th2, the battery controller 5 continues the state of stopping charging (S21).
While the charging of the battery 4a is being performed, the battery controller 5 determines whether the state of charge SoC2 of the battery 4b becomes less than the threshold Th1 (S24). If the state of charge SoC2 of the battery 4b is equal to or greater than the threshold Th1, the battery controller 5 continues charging of the battery 4a (S23). If the state of charge SoC2 of the battery 4b becomes less than the threshold Th1, the battery controller 5 stops charging of the battery 4a (S21).
By performing the above control, the state of charge SoC2 of the battery 4b can be appropriately managed.
For example, as shown in fig. 7, after the state of charge SoC2 of the battery 4b decreases due to acceleration or the like during a period from time t11 to t12, the state of charge SoC2 of the battery 4b is recovered by regeneration, and when the state of charge SoC2 of the battery 4b becomes equal to or greater than the threshold Th2 at time t13, the battery controller 5 lowers the power supply voltage of the battery 4b by the DCDC converter 40, and charges the battery 4 a. Then, when the state of charge SoC2 of the battery 4b is less than the threshold Th1 at time t14, the battery controller 5 stops charging of the battery 4 a.
The control shown in fig. 4 and the power conversion control shown in fig. 6 can be performed simultaneously as shown in fig. 8, for example. When the state of charge SoC2 of the battery 4b is less than the threshold Th1, the battery 4b is charged by the processing of S33 to S34, and when the state of charge SoC2 of the battery 4b is equal to or greater than the threshold Th2, the battery 4a is charged by the processing of S36 to S37. By performing such power conversion, the state of charge SoC2 of the battery 4b can be appropriately managed. By performing such management, it is not necessary to excessively increase the capacity of the battery 4b, and it is possible to contribute to downsizing of the entire system such as a vehicle.
< modification example >
In the above-described embodiment, the drive voltage of the motor 30 is generated by sine wave drive, but instead of sine wave drive, the drive voltage may be generated by rectangular wave drive. In the above-described embodiment, the case where the drive control of the brushless motor is performed has been described, but the present invention is also applicable to the case where the drive control of a three-phase synchronous motor or the like is performed using an inverter.
The present application claims priority of japanese patent application No. 2017-252407, which is a japanese application filed on 27/12/2017, and the entire contents of the description described in the japanese application are cited.
Description of the reference symbols
2: a motor controller; 3: a VCU; 4a, 4 b: a battery; 5: a battery controller; 6. 21c, 33: a temperature sensor; 21: an inverter; 21 a: an IGBT; 21 b: a control unit; 30: a motor; 31u, 31v, 31 w: a field coil; 32: a position sensor; 40: a DCDC conversion unit; 50: a switching circuit; 51: a control unit.

Claims (6)

1. A motor control device is characterized in that,
the motor control device comprises:
an inverter circuit that supplies a drive voltage to the motor; and
and a control unit that supplies a power supply voltage from a 1 st power supply to the inverter circuit when a torque instruction value supplied from an external source is less than a predetermined threshold value, and supplies a power supply voltage from a 2 nd power supply to the inverter circuit when the torque instruction value is equal to or more than the predetermined threshold value, the 1 st power supply supplying the 1 st power supply voltage, the 2 nd power supply supplying a power supply voltage higher than the 1 st power supply voltage.
2. The motor control apparatus according to claim 1,
the capacity of the 2 nd power supply is less than or equal to one twentieth of the capacity of the 1 st power supply.
3. The motor control device according to claim 1 or 2,
the motor control device further has an input section that inputs information indicating a threshold value,
the control unit sets the predetermined threshold value based on information indicating the threshold value.
4. The motor control apparatus according to any one of claims 1 to 3,
the control unit changes the predetermined threshold value in accordance with a variation in the torque instruction value.
5. The motor control apparatus according to any one of claims 1 to 4,
the motor control device includes a power conversion unit that performs power conversion from an arbitrary power source to another power source according to a charging state of the 2 nd power source.
6. The motor control apparatus according to claim 5,
the power conversion unit has a bidirectional DCDC converter.
CN201880084240.0A 2017-12-27 2018-11-15 Motor control device Pending CN111527690A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2017252407A JP2021044851A (en) 2017-12-27 2017-12-27 Motor control device
JP2017-252407 2017-12-27
PCT/JP2018/042265 WO2019130888A1 (en) 2017-12-27 2018-11-15 Motor control device

Publications (1)

Publication Number Publication Date
CN111527690A true CN111527690A (en) 2020-08-11

Family

ID=67063483

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201880084240.0A Pending CN111527690A (en) 2017-12-27 2018-11-15 Motor control device

Country Status (4)

Country Link
JP (1) JP2021044851A (en)
CN (1) CN111527690A (en)
DE (1) DE112018006679T5 (en)
WO (1) WO2019130888A1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101090161A (en) * 2006-06-13 2007-12-19 株式会社东芝 Storage battery system, on-vehicle power supply system, vehicle and method for charging storage battery system
JP2010081786A (en) * 2008-09-01 2010-04-08 Suri-Ai:Kk Power switching circuit
JP2016073173A (en) * 2014-10-02 2016-05-09 株式会社豊田中央研究所 Power supply system
CN105634370A (en) * 2014-11-07 2016-06-01 乐金电子研发中心(上海)有限公司 Dual power supply and energy crossfeed system used for motor drive
CN106797186A (en) * 2014-10-15 2017-05-31 罗伯特·博世有限公司 Power drive system and the method for running the motor of electric car
JP2021035202A (en) * 2019-08-27 2021-03-01 トヨタ自動車株式会社 Power supply apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0179397U (en) * 1987-11-12 1989-05-29
US9118266B2 (en) * 2012-05-07 2015-08-25 Atieva, Inc. Synchronous energy source switching controller and method of operation thereof
JP2015216824A (en) * 2014-01-30 2015-12-03 田中　正一 Traction motor driving device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101090161A (en) * 2006-06-13 2007-12-19 株式会社东芝 Storage battery system, on-vehicle power supply system, vehicle and method for charging storage battery system
JP2010081786A (en) * 2008-09-01 2010-04-08 Suri-Ai:Kk Power switching circuit
JP2016073173A (en) * 2014-10-02 2016-05-09 株式会社豊田中央研究所 Power supply system
CN106797186A (en) * 2014-10-15 2017-05-31 罗伯特·博世有限公司 Power drive system and the method for running the motor of electric car
CN105634370A (en) * 2014-11-07 2016-06-01 乐金电子研发中心(上海)有限公司 Dual power supply and energy crossfeed system used for motor drive
JP2021035202A (en) * 2019-08-27 2021-03-01 トヨタ自動車株式会社 Power supply apparatus

Also Published As

Publication number Publication date
DE112018006679T5 (en) 2020-09-17
JP2021044851A (en) 2021-03-18
WO2019130888A1 (en) 2019-07-04

Similar Documents

Publication Publication Date Title
US9849806B1 (en) Current based six step control
US7816805B2 (en) Power supply system with multiphase motor and multiphase inverter
JP3692993B2 (en) DRIVE DEVICE AND POWER OUTPUT DEVICE
US9236826B2 (en) Control device and method for operating an electrical machine driven by an inverter
WO2013077221A1 (en) Power conversion apparatus and charging system
CN109981019B (en) Motor control device
JP2017175747A (en) Power conversion device
US11398761B2 (en) Motor comprising coolant flow path
JP5784553B2 (en) Power converter
JP5303295B2 (en) Power converter for vehicle and electric vehicle
JP5899330B2 (en) Power supply
CN108482102B (en) Hybrid power driving system
JP2018098826A (en) Power supply device for vehicle and control method of the same
JP5876940B2 (en) Power supply
CN112511071A (en) Control device for power conversion device
US20190199268A1 (en) Motor control device
WO2019225373A1 (en) Motor drive device
JP6802126B2 (en) Inverter controller
CN111527690A (en) Motor control device
JP5571987B2 (en) Braking method for brushless DC motor
CN111527689A (en) Motor control device
JP5499850B2 (en) Inverter discharge control device
KR20150040232A (en) Power conversion system for electric vehicle
JP5975797B2 (en) Power converter
JP2004364485A (en) Drive system of electric car

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination