WO2023002810A1 - Dispositif pour véhicule - Google Patents

Dispositif pour véhicule Download PDF

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Publication number
WO2023002810A1
WO2023002810A1 PCT/JP2022/025572 JP2022025572W WO2023002810A1 WO 2023002810 A1 WO2023002810 A1 WO 2023002810A1 JP 2022025572 W JP2022025572 W JP 2022025572W WO 2023002810 A1 WO2023002810 A1 WO 2023002810A1
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WO
WIPO (PCT)
Prior art keywords
torque
vehicle
electric machine
region
operating point
Prior art date
Application number
PCT/JP2022/025572
Other languages
English (en)
Japanese (ja)
Inventor
晴美 堀畑
貞洋 赤間
Original Assignee
株式会社デンソー
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 株式会社デンソー filed Critical 株式会社デンソー
Priority to CN202280050502.8A priority Critical patent/CN117677527A/zh
Publication of WO2023002810A1 publication Critical patent/WO2023002810A1/fr

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Classifications

    • 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
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • 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
    • B60L9/00—Electric propulsion with power supply external to the vehicle
    • B60L9/16—Electric propulsion with power supply external to the vehicle using ac induction motors
    • B60L9/18—Electric propulsion with power supply external to the vehicle using ac induction motors fed from dc supply lines
    • 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
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/60—Controlling or determining the temperature of the motor or of the drive
    • H02P29/62—Controlling or determining the temperature of the motor or of the drive for raising the temperature of the motor
    • 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
    • Y02T10/72—Electric energy management in electromobility

Definitions

  • the present disclosure relates to a vehicle device.
  • Patent Document 1 a device that includes a rotating electric machine, an inverter, and a control device is known.
  • the control device calculates a command torque for the rotating electrical machine, and performs switching control of upper and lower arm switches constituting the inverter so as to control the torque of the rotating electrical machine to the calculated command torque.
  • the operating point of the rotating electrical machine is determined by the torque and rotation speed of the rotating electrical machine.
  • field weakening control is performed in which a field weakening current is passed through the stator windings in a region where the rotational speed is high among the operating regions of the operating point.
  • the magnitude of the current vector flowing through the stator windings of the rotating electrical machine to generate the predetermined torque becomes larger than when the field-weakening control is not performed, and the rotating electrical machine may overheat.
  • the control device sets the torque of the rotating electrical machine to a limit torque smaller than the command torque when the temperature of the rotating electrical machine exceeds a predetermined temperature.
  • the rotor of a rotating electrical machine includes field poles, so when the rotor rotates, a back electromotive force is generated in the stator windings.
  • the counter electromotive voltage increases as the rotation speed of the rotor increases.
  • the line voltage of the stator windings when a back electromotive voltage is generated may exceed the voltage of the power storage unit provided on the input side of the inverter.
  • power regeneration which is a phenomenon in which current flows from the stator windings toward the power storage unit, may occur. In this case, it is not possible to limit the current flowing through the stator windings, and there is a concern that the rotating electrical machine may become overheated.
  • a main object of the present disclosure is to provide a vehicle device capable of suppressing overheating of a rotating electric machine.
  • the present disclosure provides a rotating electric machine having a rotor and stator windings containing field poles; a power storage unit; a vehicle device comprising an inverter having upper and lower arm switches and electrically connecting the stator winding and the power storage unit,
  • a command calculation unit that calculates a command value that is either a command torque or a command rotation speed of the rotating electric machine
  • a rotary electric machine control unit that performs switching control of the upper and lower arm switches in order to control the torque of the rotary electric machine to the command torque based on the calculated command value
  • a first region including an operating point at which the rotational speed is the maximum rotational speed, and a second region adjacent to the low speed side of the first region.
  • An operating point at which the torque is 0 and the rotational speed is the highest in the second region is defined as a specific operating point
  • a region on the high speed side including the specific operating point in the second region is defined as a boundary region
  • the rotating electric machine control unit when the operating point of the rotating electric machine is within the first region or within the boundary region, performing the switching control so as to flow a field-weakening current through the stator winding; Obtaining the temperature of at least one of the rotating electric machine and the inverter, and when it is determined that the obtained temperature exceeds the limit start temperature, setting the torque of the rotating electric machine to a limit torque smaller than the command torque, When the operating point of the rotating electrical machine is within the boundary side region, the torque of the rotating electrical machine is set to the limit torque, so that the effective value of the phase current flowing in the stator winding is reduced to the allowable upper limit current of the rotating electrical machine. It is configured as follows.
  • the rotary electric machine control unit of the present disclosure acquires the temperature of at least one of the rotary electric machine and the inverter, and when it is determined that the acquired temperature exceeds the limit start temperature, sets the torque of the rotary electric machine to a limit torque smaller than the command torque. . This is intended to protect the rotating electric machine from overheating.
  • the vehicular device is configured such that the effective value of the phase current flowing through the stator windings becomes equal to or less than the allowable upper limit current of the rotating electrical machine by setting the torque of the rotating electrical machine to the limit torque. For example, by appropriately setting the rotational speed that determines the specific operating point and the amount of magnetic flux of the field poles, the effective value of the phase current flowing through the stator windings is made equal to or less than the allowable upper limit current of the rotating electric machine. According to the present disclosure described above, it is possible to prevent the rotating electric machine from becoming overheated.
  • FIG. 1 is an overall configuration diagram of the system according to the first embodiment
  • FIG. 2 is a flowchart showing the procedure of overheat protection processing performed by the MGCU
  • FIG. 3 is a diagram showing the relationship between the motor temperature and the limiting coefficient
  • FIG. 4 is a diagram showing the operating region of the operating point of the rotating electric machine
  • FIG. 5 is a diagram showing the relationship between the magnet temperature and the operating range
  • FIG. 6 is a diagram showing the relationship between the peak value of the line voltage, the rotation speed, and the magnet temperature according to the third embodiment.
  • the vehicle 10 includes a rotating electric machine 20.
  • the rotary electric machine 20 is a three-phase synchronous machine, and includes star-connected stator windings 21 for each phase.
  • the stator windings 21 of each phase are arranged with an electrical angle shift of 120°.
  • the rotary electric machine 20 of the present embodiment is a permanent magnet synchronous machine in which a rotor 22 is provided with permanent magnets (corresponding to “field poles”).
  • the rotating electric machine 20 is a vehicle-mounted main machine, and the rotor 22 can transmit power to the driving wheels 11 of the vehicle 10 . Torque generated by the rotating electric machine 20 functioning as an electric motor is transmitted from the rotor 22 to the driving wheels 11 . As a result, the driving wheels 11 are rotationally driven.
  • the rotating electric machine 20 may be, for example, an in-wheel motor provided integrally with the drive wheels 11 of the vehicle 10 or an on-board motor provided on the vehicle body of the vehicle 10 .
  • the vehicle 10 includes an inverter 30, a capacitor 31 (corresponding to a "storage unit"), and a storage battery 40.
  • the inverter 30 has three phases of series-connected bodies each including an upper arm switch SWH and a lower arm switch SWL.
  • each of the switches SWH and SWL is a voltage-controlled semiconductor switching element, specifically an IGBT. Therefore, the high potential side terminal of each switch SWH and SWL is the collector, and the low potential side terminal is the emitter. Freewheel diodes DH and DL are connected in anti-parallel to the switches SWH and SWL.
  • the first end of the stator winding 21 is connected to the emitter of the upper arm switch SWH and the collector of the lower arm switch SWL.
  • the second ends of the stator windings 21 of each phase are connected to each other at a neutral point.
  • the stator windings 21 of each phase are set to have the same number of turns.
  • the collector of the upper arm switch SWH of each phase and the positive electrode terminal of the storage battery 40 are connected by a positive electrode side bus line Lp.
  • the emitter of the lower arm switch SWL of each phase and the negative terminal of the storage battery 40 are connected by a negative bus line Ln.
  • a capacitor 31 connects the positive electrode side bus line Lp and the negative electrode side bus line Ln. Note that the capacitor 31 may be built in the inverter 30 or may be provided outside the inverter 30 .
  • the storage battery 40 is, for example, an assembled battery, and the terminal voltage of the storage battery 40 is, for example, several hundred volts.
  • the storage battery 40 is, for example, a secondary battery such as a lithium ion battery or a nickel hydrogen storage battery.
  • the vehicle 10 includes a current sensor 32, a voltage sensor 33, a rotation angle sensor 34, a motor temperature sensor 35, and an MGCU 36 (Motor Generator Control Unit, equivalent to "rotating electric machine control unit”).
  • the current sensor 32 detects currents flowing through the stator windings 21 for at least two phases among the phases.
  • Voltage sensor 33 detects the terminal voltage of capacitor 31 .
  • the rotation angle sensor 34 is, for example, a resolver and detects the rotation angle (electrical angle) of the rotor 22 .
  • a motor temperature sensor 35 detects the temperature of the rotating electric machine 20 as a motor temperature Tmgd. In this embodiment, the motor temperature sensor 35 detects the temperature of the stator winding 21 as the motor temperature Tmgd.
  • Motor temperature sensor 35 is, for example, a thermistor. Detected values from the sensors 32 to 35 are input to the MGCU 36 .
  • the MGCU 36 is mainly composed of a microcomputer 36a (corresponding to a "first computer"), and the microcomputer 36a has a CPU.
  • the functions provided by the microcomputer 36a can be provided by software recorded in a physical memory device, a computer executing the software, only software, only hardware, or a combination thereof.
  • the microcomputer 36a is provided by an electronic circuit that is hardware, it can be provided by a digital circuit including many logic circuits, or an analog circuit.
  • the microcomputer 36a executes a program stored in a non-transitory tangible storage medium as its own storage unit.
  • the program includes, for example, a program for processing shown in FIG. 2 and the like.
  • a method corresponding to the program is executed by executing the program.
  • the storage unit is, for example, a non-volatile memory. Note that the program stored in the storage unit can be updated via a network such as the Internet, for example.
  • the MGCU 36 receives a command torque Trq* transmitted from an EVCU 50 (Electric Vehicle Control Unit), which will be described later.
  • the MGCU 36 performs switching control of the switches SWH and SWL forming the inverter 30 in order to control the torque of the rotary electric machine 20 based on the received command torque Trq*.
  • the MGCU 36 calculates d- and q-axis command currents Id* and Iq* based on the command torque Trq*, for example, by maximum torque minimum current (MTPA) control.
  • MTPA maximum torque minimum current
  • the MGCU 36 calculates the d- and q-axis command currents Id* and Iq* based on a current control map in which the command torque Trq* and the d- and q-axis command currents Id* and Iq* are associated. .
  • the MGCU 36 controls the calculated d- and q-axis command currents Id* and Iq* and the d- and q-axis currents Idr and Iqr calculated based on the detected values of the current sensor 32 and the rotation angle sensor 34. , SWL. In each phase, the upper arm switch SWH and the lower arm switch SWL are alternately turned on.
  • the MGCU 36 performs power running drive control.
  • Powering drive control is switching control of the inverter 30 for converting the DC power output from the storage battery 40 into AC power and supplying the AC power to the stator windings 21 .
  • the rotating electric machine 20 functions as an electric motor and generates power running torque.
  • the MGCU 36 performs regenerative drive control.
  • Regenerative drive control is switching control of inverter 30 for converting AC power generated by rotary electric machine 20 into DC power and supplying it to storage battery 40 .
  • the rotating electric machine 20 functions as a generator and generates regenerative torque.
  • the vehicle 10 is provided with an EVCU 50 (corresponding to a "command calculation section"), which is a higher control section.
  • the EVCU 50 is mainly composed of a microcomputer 50a (corresponding to a "second computer”), and the microcomputer 50a has a CPU.
  • the functions provided by the microcomputer 50a can be provided by software recorded in a physical memory device, a computer that executes the software, only software, only hardware, or a combination thereof.
  • the microcomputer 50a is provided by an electronic circuit that is hardware, it can be provided by a digital circuit including many logic circuits, or an analog circuit.
  • the microcomputer 50a executes a program stored in its own storage unit.
  • the program includes a program for calculating the command torque Trq* and the like.
  • a method corresponding to the program is executed by executing the program.
  • the program stored in the storage unit can be updated via a network such as the Internet, for example.
  • the vehicle 10 includes a brake device 60, a brake sensor 61, and a brake CU 62 (corresponding to a "brake control unit").
  • the brake sensor 61 detects a brake stroke, which is the depression amount of a brake pedal as a brake operation member of the driver. A value detected by the brake sensor 61 is input to the brake CU 62 .
  • the vehicle 10 includes a brake device 60, a brake sensor 61, and a brake CU62.
  • the braking device 60 applies friction braking torque to the wheels including the driving wheels 11 .
  • the brake device 60 includes a master cylinder, brake pads, and the like that operate according to the amount of depression of the brake pedal.
  • the brake sensor 61 detects a brake stroke, which is the depression amount of a brake pedal as a brake operation member of the driver. A value detected by the brake sensor 61 is input to the brake CU 62 .
  • the brake CU 62 is mainly composed of a microcomputer 62a, and the microcomputer 62a includes a CPU.
  • the functions provided by the microcomputer 62a can be provided by software recorded in a physical memory device, a computer that executes the software, only software, only hardware, or a combination thereof.
  • the microcomputer 62a if the microcomputer 62a is provided by a hardware electronic circuit, it can be provided by a digital circuit including a number of logic circuits, or by an analog circuit.
  • the microcomputer 62a executes a program stored in its own storage unit.
  • the programs include programs such as braking torque control processing of the brake device 60 .
  • a method corresponding to the program is executed by executing the program.
  • the program stored in the storage unit can be updated via a network such as the Internet, for example.
  • the MGCU 36, EVCU 50, and brake CU 62 can exchange information with each other through a predetermined communication format (eg, CAN).
  • a predetermined communication format eg, CAN
  • the vehicle 10 includes an accelerator sensor 70 and a steering angle sensor 71.
  • the accelerator sensor 70 detects an accelerator stroke, which is the depression amount of an accelerator pedal as an accelerator operation member of the driver.
  • the steering angle sensor 71 detects the steering angle of the steering wheel by the driver. Detected values of the accelerator sensor 70 and the steering angle sensor 71 are input to the EVCU 50 .
  • the EVCU 50 calculates a command rotational speed Nm* of the rotor 22 based on the accelerator stroke detected by the accelerator sensor 70 and the steering angle detected by the steering angle sensor 71 .
  • the EVCU 50 calculates a command torque Trq* as a manipulated variable for feedback-controlling the rotation speed of the rotor 22 to the calculated command rotation speed Nm*.
  • the EVCU 50 transmits the calculated command torque Trq* (corresponding to “command value”) to the MGCU 36 .
  • the rotation speed of the rotor 22 may be calculated based on the detection value of the rotation angle sensor 34, for example. Further, when the vehicle 10 is provided with an automatic driving function, the EVCU 50, for example, based on the target traveling speed of the vehicle 10 set by the automatic driving CU provided in the vehicle 10 when the automatic driving mode is executed , the command rotation speed Nm* may be calculated.
  • the vehicle 10 is equipped with a situation recognition device 72.
  • the situation recognition device 72 includes a temperature sensor that detects the outside air temperature and road surface temperature around the vehicle 10, a rain detection sensor that detects rainfall, a snow detection sensor that detects snowfall, a camera device, and the like. Thereby, the situation recognition device 72 can acquire road surface situation information around the own vehicle 10 .
  • the camera device captures an image of the surrounding environment including the road surface of the vehicle 10, and is a monocular camera or a stereo camera.
  • the situation recognition device 72 includes, for example, a navigation device and a tilt angle sensor, and has a function of detecting road gradient information near the vehicle 10 .
  • the navigation device detects a road surface gradient near the vehicle 10 based on map information and positioning information transmitted from GPS satellites.
  • the tilt angle sensor detects the road surface gradient near the vehicle 10 .
  • a detection value of the situation recognition device 72 is input to the EVCU 50 .
  • the brake CU 62 calculates the total braking torque Fbrk to be applied to the wheels based on the brake stroke detected by the brake sensor 61 .
  • Brake CU62 receives regenerative braking torque Fgmax from EVCU50.
  • the regenerative possible braking torque Fgmax is the current maximum value of the braking torque that can be applied to the wheels by regenerative drive control.
  • the brake CU62 calculates a regeneration instruction braking torque Fgb and a friction instruction braking torque Fmb based on the regenerative braking torque Fgmax and the total braking torque Fbrk. For example, the brake CU 62 calculates the friction command braking torque Fmb by subtracting the regeneration command braking torque Fgb from the total braking torque Fbrk.
  • the brake CU 62 transmits the calculated regenerative command braking torque Fgb to the EVCU 50 .
  • the EVCU 50 transmits the received regeneration instruction braking torque Fgb to the MGCU 36 as the instruction torque Trq*.
  • the greater the regeneration command braking torque Fgb the greater the generated electric power supplied from the rotating electric machine 20 to the storage battery 40 via the inverter 30 .
  • the brake CU 62 transmits the calculated friction command braking torque Fmb to the brake device 60 .
  • the braking torque applied to the wheels by the braking device 60 is controlled to the friction command braking torque Fmb.
  • the processing shown in FIG. 2 is, for example, repeatedly executed at a predetermined control cycle.
  • step S10 it is determined whether or not the motor temperature Tmgd detected by the motor temperature sensor 35 has exceeded the limit start temperature TempH.
  • Limitation start temperature TempH is set to a temperature at which it can be determined that at least one of rotating electric machine 20 and inverter 30 is in an overheated state.
  • step S10 When it is determined in step S10 that the motor temperature Tmgd exceeds the restriction start temperature TempH, the process proceeds to step S11, and the torque of the rotating electric machine 20 is increased so as to be smaller than the command torque Trq* received from the EVCU 50.
  • Switching control of the lower arm switches SWH and SWL is performed.
  • the received command torque Trq* is multiplied by the limit coefficient Klim, and the multiplied value, the limit torque (Klim ⁇ Trq*), is used to control the torque of the rotary electric machine 20.
  • Switching control of the upper and lower arm switches SWH and SWL may be performed.
  • the limit coefficient Klim is 1 when the motor temperature Tmgd is equal to or lower than the limit start temperature TempH, and when the motor temperature Tmgd exceeds the limit start temperature TempH, the higher the motor temperature Tmgd, the smaller the value.
  • the limit coefficient Klim becomes zero.
  • a control system including the rotating electrical machine 20 and the inverter 30 has a configuration for more accurately performing overheat protection of the rotating electrical machine 20 in addition to the overheat protection control described above. This configuration will be described below.
  • FIG. 4 shows the operating region of the operating points of the rotating electric machine 20.
  • the operating point is determined from the torque Trq and rotational speed Nm of the rotary electric machine 20 .
  • Power running drive control is performed when the torque Trq is a positive value.
  • the torque Trq is a negative value, regenerative drive control is performed.
  • the operation area consists of a high speed area Rhr, a power running side high torque area Rhtm, a regeneration side high torque area Rhtg and a continuous operation area Rcc.
  • the high-speed region Rhr corresponds to the first region, is adjacent to the continuous operation region Rcc, the powering-side high-torque region Rhtm, and the regeneration-side high-torque region Rhtg, and is on the high-speed side with respect to these regions Rcc, Rhtm, and Rhtg. is the area of
  • the high-speed region Rhr is a region in which field-weakening control is performed to apply a field-weakening current to the stator winding 21 .
  • the rotational speed at the boundary of the high rotational speed region Rhr is the maximum rotational speed Nmax of the rotor 22 .
  • the continuous operation region Rcc is a region in which the rotary electric machine 20 and the inverter 30 can be driven continuously without overheating if the rotation speed and torque are within that region.
  • the boundary on the high torque side in the continuous operation region Rcc is the upper limit value TmC of the continuous torque when the power running drive control is performed and the upper limit value TgC of the continuous torque when the regenerative drive control is performed.
  • the powering side high torque region Rhtm and the regeneration side high torque region Rhtg are regions adjacent to the continuous operation region Rcc and on the high torque side with respect to the continuous operation region Rcc. Further, the high speed side of the powering side high torque region Rhtm and the regeneration side high torque region Rhtg are adjacent to the high speed region Rhr.
  • a rotational speed defining a boundary between the high torque regions Rhtm, Rhtg and the continuous operation region Rcc and the high speed region Rhr is the high speed side threshold value Nth. When the current rotational speed Nm exceeds the high speed side threshold value Nth, the current operating point is within the high speed region Rhr.
  • TmL indicates the positive upper limit torque in the high speed region Rhr and the powering side high torque region Rhtm
  • TgL indicates the negative upper limit torque in the high speed region Rhr and the regeneration side high torque region Rhtg.
  • the high speed side region including the high speed side threshold value Nth is the boundary side region Rbrd in which field weakening control is performed.
  • the operating point at which the torque Trq is 0 and the rotational speed Nm is the highest is defined as a specific operating point P
  • the rotational speed Nm that determines the specific operating point P is defined as a specific rotational speed Nmot.
  • the specific rotational speed Nmot is the high speed side threshold value Nth when the torque Trq is zero.
  • the specific rotation speed Nmot is the rotation speed Nm of the rotor 22 that is assumed when the vehicle 10 travels on the road at the legal maximum speed.
  • the specific rotation speed Nmot is, for example, the rotation speed Nm of the rotor 22 that is assumed when the vehicle 10 steadily travels on a highway at the legal maximum speed (for example, 120 km/h).
  • the area overlapping the boundary side area Rbrd in the continuous operation area Rcc is assumed when the vehicle is steadily traveling on a highway having a design speed and a longitudinal gradient corresponding to the design speed specified by the Road Structure Ordinance, for example. is a set of operating points For example, when the design speed is 120 km/h, the maximum longitudinal gradient is 5%.
  • the specific rotation speed Nmot may be, for example, the rotation speed Nm of the rotor 22 that is assumed when the vehicle 10 steadily travels on a general road at the legal maximum speed (for example, 60 km/h).
  • the effective value Iph of the phase current flowing through the stator winding 21 is equal to the allowable value of the rotating electrical machine 20 (specifically, the stator winding 21).
  • the control system is configured so that the current is equal to or less than the upper limit current Ith (specifically, for example, the allowable current at all times).
  • the weakening field current flowing through the stator winding 21 is set so that the effective value Iph of the phase current when the operating point becomes the specific operating point P is equal to or lower than the allowable upper limit current Ith of the stator winding 21. It can be realized by The configuration described above is a configuration for performing overheat protection of the rotating electric machine 20 more accurately.
  • the control system is configured so that the effective value Iph of the phase current flowing through the stator winding 21 is equal to or less than the allowable upper limit current Ith of the rotating electric machine 20, so the temperature of the stator winding 21 is When the temperature falls below the allowable upper limit temperature (specifically, for example, the allowable maximum temperature at all times), the MGCU 36 can protect the rotary electric machine 20 from overheating.
  • the specific rotation speed Nmot is the rotation speed Nm of the rotor 22 assumed when the vehicle 10 travels on the road at the legal maximum speed.
  • the frequency of the traveling speed of the vehicle 10 being the legal maximum speed is low, and the frequency of the traveling speed being less than the legal maximum speed is usually higher. Therefore, the overheating protection of the rotating electrical machine 20 can be accurately performed in the normally assumed driving conditions of the vehicle 10 .
  • FIG. 5 shows a case where the magnet temperature T ⁇ d becomes the first and second temperatures T ⁇ 1 and T ⁇ 2 (T ⁇ 1 ⁇ T ⁇ 2).
  • Nmot(T ⁇ 1) indicates the specific operating point P when the magnet temperature T ⁇ d is the first temperature T ⁇ 1
  • Nmot(T ⁇ 2) is the specific operating point P when the magnet temperature T ⁇ d is the second temperature T ⁇ 2.
  • An operating point P is indicated. The same applies to the high speed side threshold value Nth and the maximum rotation speed Nmax.
  • the current control map used in the MGCU 36 may be a map in which the magnet temperature T ⁇ d, the command torque Trq*, and the d, q-axis command currents Id* and Iq* are associated with each other.
  • the MGCU 36 may use, for example, the motor temperature Tmgd detected by the motor temperature sensor 35 as the magnet temperature T ⁇ d, or may use the magnet temperature T ⁇ d estimated based on the motor temperature Tmgd.
  • the setting method of the specific rotational speed Nmot that determines the specific operating point P is changed.
  • the specific rotation speed Nmot is set when the braking device 60 does not apply friction braking torque to the wheels of the vehicle 10 and the drive wheels 11 are not powered by the power generator including the rotating electric machine 20 .
  • Equation (eq1) m indicates vehicle mass
  • a indicates vehicle acceleration
  • g indicates gravitational acceleration
  • Ft indicates wheel rolling resistance
  • Fa indicates air resistance acting on the vehicle.
  • the rolling resistance Ft is expressed by the following equation (eq2)
  • the air resistance Fa is expressed by the following equation (eq3).
  • ⁇ represents a rolling resistance coefficient.
  • ⁇ indicates the density of air
  • Cd indicates the air resistance coefficient
  • S indicates the frontal projected area of the vehicle
  • v indicates the running speed of the vehicle.
  • the specific rotation speed Nmot that determines the specific operating point P is set to the rotation speed of the rotor 22 when the running speed of the vehicle 10 is the terminal speed vter.
  • the stator winding 20 is controlled so that the effective value Iph of the phase current flowing through the stator winding 21 is equal to or less than the allowable upper limit current Ith of the stator winding 21 . It suffices that the field-weakening current to be passed through the winding 21 is set.
  • the terminal speed vter and the specific rotation speed Nmot increase as the gradient ⁇ increases. Therefore, for example, the rotation speed of the rotor 22 may be set to the specific rotation speed Nmot when the vehicle runs at the terminal speed vter corresponding to the maximum value of the range that the gradient ⁇ can take.
  • the specific rotation speed Nmot is set to the rotation speed of the rotor 22 assumed when the running speed of the vehicle is the terminal speed vter. Therefore, even if an abnormality occurs in the EVCU 50 or the brake CU 62, for example, the electric power supply to the EVCU 50 or the brake CU 62 is stopped, overheat protection of the rotating electric machine 20 can be performed.
  • the current control map used in the MGCU 36 may be a map in which the gradient ⁇ of the road surface, the rolling resistance coefficient ⁇ , the command torque Trq* and the d- and q-axis command currents Id* and Iq* are associated with each other.
  • the information of the road surface gradient ⁇ and the rolling resistance coefficient ⁇ may be acquired based on the detection values of the situation recognition device 72 .
  • the current control map may be a map associated with the magnet temperature T ⁇ d as described above.
  • the setting method of the specific rotational speed Nmot that determines the specific operating point P is changed.
  • the specific rotational speed Nmot is the line voltage induced in the stator winding 21 as the rotor 22 rotates when the field-weakening current is not applied to the stator winding 21.
  • the rotational speed of the rotor 22 is set such that the peak value Vemf and the terminal voltage Vdc of the capacitor 31 are the same.
  • the specific rotation speed Nmot is set to the peak value Vemf of the line voltage and
  • the rotation speed of the rotor 22 may be set to the same value as the terminal voltage Vdc.
  • the temperature of the inverter 30 may be used, or the higher temperature of the motor temperature Tmgd and the temperature of the inverter 30 may be used.
  • the temperature of the inverter 30 may be detected, for example, by a sensor (for example, a temperature sensitive diode or a thermistor) that detects the temperatures of the upper and lower arm switches SWH and SWL that constitute the inverter 30 .
  • the EVCU 50 may transmit the command rotational speed Nm* to the MGCU 36.
  • the MGCU 36 may calculate the command torque Trq* as the manipulated variable for feedback-controlling the rotation speed of the rotor 22 to the received command rotation speed Nm*.
  • the computing functions of the EVCU 50, the MGCU 36, and the brake CU 63 may be integrated into one CU.
  • the semiconductor switch that constitutes the inverter is not limited to an IGBT, and may be, for example, an N-channel MOSFET with a built-in body diode.
  • the high side terminal of the switch is the drain and the low side terminal is the source.
  • the rotating electric machine is not limited to a star-connected one, and may be, for example, a delta-connected one.
  • the controller and techniques described in this disclosure can be performed by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program; may be implemented.
  • the controls and techniques described in this disclosure may be implemented by a dedicated computer provided by configuring the processor with one or more dedicated hardware logic circuits.
  • the control units and techniques described in this disclosure can be implemented by a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. It may also be implemented by one or more dedicated computers configured.
  • the computer program may also be stored as computer-executable instructions on a computer-readable non-transitional tangible recording medium.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

Ce dispositif pour véhicule comprend : une unité de calcul de commande (50) qui calcule une valeur de commande pour une machine électrique tournante (20) ; et une unité de commande de machine électrique tournante (36) qui fournit, sur la base de la valeur de commande calculée, une commande de commutation à un onduleur (30), qui commande le couple de la machine électrique tournante pour en faire un couple de commande. L'unité de commande de machine électrique tournante réalise la commande de commutation de façon à amener un courant d'affaiblissement de champ à circuler lorsque le point de fonctionnement de la machine électrique tournante se trouve à l'intérieur d'une première région ou à l'intérieur d'une région côté limite, acquiert la température de la machine électrique tournante ou similaire, et configure le couple de la machine électrique tournante pour en faire un couple limite lorsqu'il a été déterminé que la température acquise a dépassé une température d'initiation limite. Le dispositif pour véhicule est configuré de telle sorte que la valeur efficace d'un courant de phase soit inférieure ou égale au courant maximal autorisé de la machine électrique tournante, du fait que le couple de la machine électrique tournante est configuré pour être le couple limite lorsque le point de fonctionnement de la machine électrique tournante se trouve à l'intérieur de la région côté limite.
PCT/JP2022/025572 2021-07-20 2022-06-27 Dispositif pour véhicule WO2023002810A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202280050502.8A CN117677527A (zh) 2021-07-20 2022-06-27 车辆用装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-119993 2021-07-20
JP2021119993A JP2023015911A (ja) 2021-07-20 2021-07-20 車両用装置

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WO2023002810A1 true WO2023002810A1 (fr) 2023-01-26

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JP (1) JP2023015911A (fr)
CN (1) CN117677527A (fr)
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008005615A (ja) * 2006-06-22 2008-01-10 Nissan Motor Co Ltd 電動車両のモータ出力制御装置
JP2013187983A (ja) * 2012-03-07 2013-09-19 Hitachi Automotive Systems Ltd 回転電機制御装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008005615A (ja) * 2006-06-22 2008-01-10 Nissan Motor Co Ltd 電動車両のモータ出力制御装置
JP2013187983A (ja) * 2012-03-07 2013-09-19 Hitachi Automotive Systems Ltd 回転電機制御装置

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CN117677527A (zh) 2024-03-08

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