JP2016220446A - Electric-vehicular drive force control apparatus - Google Patents

Electric-vehicular drive force control apparatus Download PDF

Info

Publication number
JP2016220446A
JP2016220446A JP2015104658A JP2015104658A JP2016220446A JP 2016220446 A JP2016220446 A JP 2016220446A JP 2015104658 A JP2015104658 A JP 2015104658A JP 2015104658 A JP2015104658 A JP 2015104658A JP 2016220446 A JP2016220446 A JP 2016220446A
Authority
JP
Japan
Prior art keywords
switching element
short
inverter
force control
phase
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.)
Granted
Application number
JP2015104658A
Other languages
Japanese (ja)
Other versions
JP6512549B2 (en
Inventor
金子 雄太郎
Yutaro Kaneko
雄太郎 金子
翔 大野
Sho Ono
翔 大野
健太 ▲高▼橋
健太 ▲高▼橋
Kenta Takahashi
司 廣瀬
Tsukasa Hirose
司 廣瀬
Original Assignee
日産自動車株式会社
Nissan Motor Co Ltd
株式会社明電舎
Meidensha 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 日産自動車株式会社, Nissan Motor Co Ltd, 株式会社明電舎, Meidensha Corp filed Critical 日産自動車株式会社
Priority to JP2015104658A priority Critical patent/JP6512549B2/en
Publication of JP2016220446A publication Critical patent/JP2016220446A/en
Application granted granted Critical
Publication of JP6512549B2 publication Critical patent/JP6512549B2/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility
    • Y02T10/7208Electric power conversion within the vehicle
    • Y02T10/7241DC to AC or AC to DC power conversion

Abstract

PROBLEM TO BE SOLVED: To provide a driving force control device for an electric vehicle capable of suppressing generation of a regenerative current due to a short circuit failure of a switching element without adding a shut-off mechanism. When a short-circuit fault of a switching element 26 is detected, each switching element 26 on the opposite side and in phase of the switching element 26 in which the short-circuit fault is detected is turned on, and each remaining switching element 26 is turned off. The switching element 26 having the short-circuit failure is melted. [Selection] Figure 2

Description

  The present invention relates to a driving force control device for an electric vehicle.

In an electric vehicle that drives wheels by an electric motor, if a short-circuit failure occurs in the switching element of the inverter, the regenerative current flows due to the induced voltage of the electric motor even if the power supply from the battery to the inverter is cut off. There is concern about damage to normal switching elements.
Patent Document 1 describes a technique for interrupting a regenerative current by detecting a short circuit failure of a switching element and preventing formation of a current path including an electric motor and a switching element in which the short circuit failure is detected. .

JP 2008-125162 A

However, in the above prior art, since it is necessary to add a regenerative current interruption mechanism, there is a problem that the size and cost of the inverter are increased.
An object of the present invention is to provide a driving force control device for an electric vehicle that can suppress the generation of a regenerative current due to a short-circuit failure of a switching element without adding a blocking mechanism.

  The present invention includes an inverter in which a plurality of switching elements are connected in parallel to the positive arm and the negative arm of a multi-phase leg, and when a short circuit failure of the switching element is detected, the switching in which the short circuit failure is detected. A short-circuit fault inverter control unit is provided to turn on each switching element having a different polarity and the same phase of the element and turn off the remaining switching elements.

  Therefore, generation | occurrence | production of the regenerative current accompanying the short circuit failure of a switching element can be suppressed, without adding a interruption | blocking mechanism.

1 is a system configuration diagram of an electric vehicle to which a driving force control device according to a first embodiment is applied. 1 is a configuration diagram of a motor drive circuit of Embodiment 1. FIG. 3 is a flowchart illustrating a flow of inverter control processing executed by the motor controller 6 according to the first embodiment. It is a figure which shows the determination method of the short circuit fault location based on the combination of the code | symbol of the electric current value of each phase. 6 is a flowchart showing a flow of inverter control processing executed by the motor controller 6 of the second embodiment. 7 is a flowchart showing a flow of inverter control processing executed by a motor controller 6 of Embodiment 3. FIG. 6 is a configuration diagram of a motor drive circuit according to a fourth embodiment. FIG. 10 is a configuration diagram of a motor drive circuit according to a fifth embodiment. FIG. 10 is a configuration diagram of a motor drive circuit according to a sixth embodiment. FIG. 10 is a configuration diagram of a motor drive circuit according to a seventh embodiment.

[Example 1]
FIG. 1 is a system configuration diagram of an electric vehicle to which the driving force control apparatus according to the first embodiment is applied. In FIG. 1, subscripts FL, FR, RL, and RR at the end of the symbol indicate members corresponding to the left front wheel, the right front wheel, the left rear wheel, and the right rear wheel. In the following description, the subscripts FL, FR, RL, and RR are omitted unless they are distinguished from each other.
The wheel 1 is connected to an electric motor (hereinafter referred to as a motor) 2. The motor 2 is a permanent magnet type synchronous motor having a three-phase coil in a stator and generating a drive torque by three-phase AC power. A reduction gear 3 is interposed between the wheel 1 and the motor 2. An inverter 4 is connected to the motor 2. The inverter 4 has a plurality of switching elements (power semiconductor elements such as IGBTs and MOS-FETs), and converts DC power supplied from a high-voltage battery (hereinafter referred to as a battery) 5 as a storage battery into AC power. This is a three-phase output inverter supplied to the motor 2. The motor controller 6 generates a PWM signal for controlling the motor 2 based on the motor torque command value calculated by the vehicle controller 7. The motor controller 6 generates a gate drive voltage for each switching element of the inverter 4 through the drive circuit in accordance with the generated PWM signal, and applies it as a gate voltage to the gate terminal of each switching element.

  The steering angle sensor 8 detects the steering angle of the steering wheel. The accelerator opening sensor 9 detects the opening of the accelerator pedal. The brake pedal stroke sensor 10 detects the stroke of the brake pedal. The mode switch 11 outputs a signal corresponding to the current travel mode. The yaw rate sensor 12 detects the yaw rate of the vehicle. The lateral acceleration sensor 13 detects the lateral acceleration of the vehicle. The longitudinal acceleration sensor 14 detects the longitudinal acceleration of the vehicle. The wheel speed sensor 15 detects the wheel speed of the corresponding wheel 1. The vehicle controller 7 calculates a motor torque command value for each motor 2 based on signals from each sensor and switch.

FIG. 2 is a configuration diagram of the motor drive circuit according to the first embodiment. In FIG. 2, suffixes P and N at the end of the symbol indicate members corresponding to the positive electrode side (P side) and the negative electrode side (N side), and the suffixes U, V, and W are U phase and V phase. Represents a member corresponding to the W phase. In the following description, the subscripts P and N and the subscripts U, V, and W are omitted unless they are distinguished from each other.
A P-side DC power line 16P is connected to the positive terminal of the battery 5, and an N-side DC power line 16N is connected to the negative terminal. The inverter 4 includes three-phase legs 17U, 17V, 17W and a smoothing capacitor 18. The smoothing capacitor 18 suppresses voltage fluctuation due to switching surge or the like. The P-side DC power line 16P and the N-side DC power line 16N are provided with high-power relays 19P and 19N that connect and disconnect the inverter 4 and the battery 5.

The P-side arm 20 of the leg 17 is connected to the P-side DC power line 16P. The N-side arm 21 of the leg 17 is connected to the N-side DC power line 16N. An intermediate point 22 between the P-side arm 20 and the N-side arm 21 is connected to the coil 24 of the motor 2 via an AC power line 23. The AC power line 23 is provided with a current sensor 25 that detects a phase current. The phase current detected by the current sensor 25 is input to the motor controller 6 and used for generating a PWM signal. Since the sum of the three-phase current values is 0, a current sensor 25 may be provided on the two-phase AC power line 23, and the remaining one-phase current may be obtained by calculation.
The P-side arm 20 and the N-side arm 21 are circuits in which a plurality of switching elements (for example, power semiconductor elements such as IGBT and MOS-FET) 26 are connected in parallel. A free-wheeling diode 27 is reversely connected to the switching element 26. Here, the switching element 26 has a current capacity (allowable current) smaller than the phase current. The number of parallel switching elements 26 in the P-side arm 20 and the N-side arm 21 is determined from the phase current and the current capacity (allowable current) of the switching element 26. That is, the parallel number is set so that the maximum value of the current (phase current / parallel number) flowing through the switching elements 26 on the same phase and same polarity side does not exceed the current capacity of the switching element 26. In the first embodiment, the parallel number is 16.

[Inverter control processing]
FIG. 3 is a flowchart showing the flow of inverter control processing executed by the motor controller 6 according to the first embodiment. This process is performed for all inverters 4FL, 4FR, 4RL, and 4RR.
In step S1, the inverter short circuit determination unit (inverter short circuit determination means) 6a determines whether or not the inverter 4 is short-circuited. If YES, the process proceeds to step S2, and if NO, the process proceeds to step S10. In this step, the collector-emitter voltage of each phase switching element 26 is monitored, and when the collector-emitter voltage of at least one switching element 26 exceeds a predetermined voltage, it is determined that the inverter 4 is short-circuited. .
In step S2, all switching elements 26 are turned off (gate off command). At this time, all the switching elements 26 are also turned off for the inverters 4 that are not determined to be short-circuited.
In step S3, it is determined whether at least one of the current values of each phase is equal to or greater than a predetermined value. If YES, the process proceeds to step S4. If NO, the process proceeds to step S10. The predetermined value is a current value at which it can be determined that a short circuit failure of the switching element 26 has occurred.

  In step S4, in the element short-circuit fault detection unit (element short-circuit fault detection means) 6b, the short-circuit fault site (the short-circuit faulty switching element 26) is determined from the sign of the current value of each phase. FIG. 4 (a) shows a method for determining a short-circuit fault site by the sign of the current value. The sign of the current value is positive (+) in the direction from the inverter 4 to the motor 2, and negative (-) in the direction from the motor 2 to the inverter 4. FIG. 4B shows a short-circuit fault location determination method when the current sensors 25 are provided in the U phase and the W phase. In this case, the short-circuit fault site is determined from the signs and magnitudes of the current values of the U phase and the W phase.

In step S5, in the inverter controller 6c at the time of the short circuit failure (inverter control means at the time of the short circuit failure), the switching elements 26 on the opposite polarity side and the same phase (short circuit reverse side of the short circuit phase) of the switching element 26 in which the short circuit failure is detected Each of the switching elements 26 that are ON (gate ON command) and the remaining (normal phase & short-circuited short-circuit side) is turned OFF.
In step S6, it is determined whether or not a predetermined time has elapsed since the process of step S5 was started. If yes, then continue with step S7, otherwise repeat step S6. The predetermined time is a time during which the switching element 26 having a short-circuit failure can be blown, and is set to 20 μsec, for example.
In step S7, all the switching elements 26 are turned off.
In step S8, it is determined whether at least one of the current values of each phase is equal to or greater than a predetermined value. If YES, the process proceeds to step S4. If NO, the process proceeds to step S9. The predetermined value is the same as in step S3.

In step S9, each normal switching element 26 is used, and the maximum torque of the motor 2 is limited so that the current value flowing through each switching element 26 does not exceed the current capacity. The operation of the motor 2 that generates the gate drive voltage and applies it as the gate voltage to the gate terminal of each switching element 26 is resumed.
In step S10, the gate drive voltage of each switching element 26 is generated based on the motor torque command value, and the normal operation of the motor 2 applied as the gate voltage to the gate terminal of each switching element 26 is continued.

Hereinafter, the operation of the inverter control process according to the first embodiment will be described using a specific example.
For example, a case is assumed where one of the switching elements 26PU of the U-phase P-side arm 20U of an inverter 4 has a short circuit failure. At this time, the power supply from the battery 5 to the motor 2 can be cut off by turning off both the high-voltage relays 19P and 19N and all the switching elements 26. However, a short-circuit route is formed in the short-circuited switching element 26PU and the free-wheeling diodes 27NV and 27NW of the V-phase N-side arm 20V and W-phase N-side arm 20W. There is a possibility that current flows and the coil 24 of the motor 2 is blown or the normal switching element 26 is damaged. In addition, when braking torque is applied to one wheel 1, the driver feels uncomfortable and the vehicle behavior may be disturbed due to a difference in braking force between the left and right.

  In contrast, in the first embodiment, when a short circuit failure is detected in one of the switching elements 26PU of the U-phase P-side arm 20U in step S4, each switching element 26 of the U-phase N-side arm 21U is turned on in step S5. At the same time, the remaining switching elements 26 are turned off, and a fusing process is performed to continue this state for a predetermined time. As a result, in the U-phase P-side arm 20U, the phase current flows only in the switching element 26PU that is short-circuited. That is, since a current that greatly exceeds the current capacity flows through the switching element 26 that has undergone a short circuit failure, the short circuit part is burned out in a short time, and the regenerative current short circuit route is interrupted. At this time, since the current smaller than the current capacity flows through each switching element 26 of the U-phase N-side arm 21U as in the normal operation, the normal switching element 26 does not melt or break. Therefore, in the first embodiment, it is possible to suppress the generation of the braking torque due to the short circuit failure of the switching element 26 without adding a regenerative current interruption mechanism. In addition, although the number of switching elements increases compared with the conventional leg which connected two switching elements in series, the leg 17 of Example 1 uses a small switching element with small current capacity, so that there are many parallel elements. Therefore, there is no increase in size or cost. The same applies to the freewheeling diode 27.

  In the first embodiment, when a short circuit of the inverter 4 is detected in step S1, all the switching elements 26 are turned off in step S2. In step S3, when at least one of the current values of each phase is equal to or greater than a predetermined value, it is determined that the switching element 26 has a short-circuit failure, and the short-circuit failure portion is specified in step S4. Process. When a short circuit occurs in the inverter 4 due to a factor other than the short circuit failure of the switching element 26, the short circuit route of the regenerative current is not formed, and thus the fusing process is useless. That is, by performing the fusing process only when a short circuit failure of the switching element 26 is detected, unnecessary fusing process can be suppressed.

  In the first embodiment, after fusing the short-circuit faulty switching element 26, each normal switching element 26 is used in step S9, and the motor 2 is redriven based on the motor torque command value while limiting the maximum torque. Since the P-side arm 20 and the N-side arm 21 of the first embodiment have 16 parallel switching elements 26, even if one switching element 26 is opened due to fusing, the remaining 15 normal elements are It can be used to drive the motor 2 and continue running of the vehicle. At this time, a larger current (16/15 times) than that before fusing flows through the normal 15 switching elements 26, but by limiting the maximum torque of the motor 2, the normal 15 switching elements It can be avoided that the current flowing through the element 26 exceeds the current capacity.

Example 1 has the following effects.
(1) 16 switching elements in the P-side arm 20 and N-side arm 21 of the three-phase leg 17 corresponding to the three-phase coil 24 and the motor 2 having the three-phase coil 24 and driving the wheel 1 26 is connected in parallel, the DC power supplied from the battery 5 is converted into AC power and supplied to the motor 2, the short circuit fault detecting unit 6b for detecting the short circuit faulty switching element 26, the switching element When the short-circuit fault of 26 is detected, the inverter control unit 6c at the time of the short-circuit fault that turns on each switching element 26 on the different polarity side and the same phase of the switching element 26 in which the short-circuit fault is detected, and turns off the remaining switching elements 26; , With.
Therefore, the switching element 26 that has a short circuit failure can be blown out without adding a blocking mechanism, and the generation of regenerative current due to the short circuit failure of the switching element 26 can be suppressed.

(2) Inverter 4 includes an inverter short-circuit determining unit 6a that determines whether or not a short circuit has occurred, and when it is determined that a short-circuit failure has occurred in the inverter 4, All the switching elements 26 are turned off, and the element short-circuit fault detection unit 6b detects the short-circuited switching element 26 based on each phase current when all the switching elements 26 are turned off.
Therefore, when the inverter 4 is short-circuited due to a cause other than the short-circuit failure of the switching element 26, it is possible to suppress the unnecessary fusing process of the switching element 26 from being performed.

(3) At the time of short-circuit failure, the inverter control unit 6c drives the motor 2 while limiting the output using each normal switching device 26 after the switching device 26 in which the short-circuit failure has occurred.
Therefore, even when a short circuit failure occurs in the switching element 26, the vehicle can continue to travel without applying an excessive thermal load to each normal switching element 26.

[Example 2]
The second embodiment is different from the first embodiment only in the inverter control process. The same components as those in the first embodiment are denoted by the same reference numerals, and illustration and description thereof are omitted.
[Inverter control processing]
FIG. 5 is a flowchart showing the flow of inverter control processing executed by the motor controller 6 of the second embodiment. Steps that perform the same processing as the inverter control processing of the first embodiment are denoted by the same step numbers and description thereof is omitted.
In step S11, each switching element 26 of the P-side arm 20 is turned off, and each switching element 26 of the N-side arm 21 is turned on.
In step S12, each switching element 26 of the P-side arm 20 is turned on, and each switching element 26 of the N-side arm 21 is turned off.
In step S13, it is determined whether or not the processing in steps S11 and S12 has been repeated a predetermined number of times. If YES, the process proceeds to step S7. If NO, the process proceeds to step S11. The predetermined number of times is the number of times that the switching element 26 having a short circuit failure can be melted.

  In the second embodiment, when a short circuit of the inverter 4 is detected in step S1, the P-side arm 20 is turned off and the N-side arm 21 is turned on, and the P-side arm 20 is turned on and the N-side arm 21 in steps S11 to S13. The fusing process is repeated for a predetermined number of times. As a result, when one of the switching elements 26 of a certain arm has a short circuit failure, the phase current flows only in the switching element 26 having the short circuit failure in the arm. Therefore, it is possible to burn out the short-circuited portion with a simple control without detecting the switching element 26 having a short-circuit failure.

Example 2 has the following effects.
(4) A motor 2 having a three-phase coil 24 and driving a wheel 1, and 16 switching elements in each of the P-side arm 20 and the N-side arm 21 of the three-phase leg 17 corresponding to the three-phase coil 24 26 is connected in parallel, the DC power supplied from the battery 5 is converted into AC power and supplied to the motor 2, and the inverter short circuit determination unit 6a that determines whether or not a short circuit has occurred in the inverter 4. And, when it is determined that a short circuit has occurred in the inverter 4, a short-circuit fault inverter control unit 6c that alternately turns on and off the P-side switching elements 26 and the N-side switching elements 26 is provided. .
Therefore, it is possible to suppress the generation of the regenerative current due to the short circuit failure of the switching element 26 without adding an interruption mechanism. Further, it is not necessary to detect the switching element 26 having a short circuit failure, and the fusing of the switching element 26 having a short circuit failure can be realized by simple control.

Example 3
The third embodiment is different from the first embodiment only in the inverter control process. The same components as those in the first embodiment are denoted by the same reference numerals, and illustration and description thereof are omitted.
[Inverter control processing]
FIG. 6 is a flowchart showing the flow of inverter control processing executed by the motor controller 6 of the third embodiment. Steps that perform the same processing as the inverter control processing of the first embodiment are denoted by the same step numbers and description thereof is omitted.
In step S14, the inverter control unit 6c at the time of the short-circuit failure turns on the remaining switching elements 26 on the different polarity side and the different phase (short-circuit reverse side of the normal phase) of the switching element 26 in which the short-circuit failure is detected, and the remaining (normal phase & short circuit) Each switching element 26 on the short-circuit side) is turned off, and a no-load current is supplied to the motor 2.
In step S15, it is determined whether or not a current of a predetermined value or more has flowed through the current sensor 25. If YES, the process proceeds to step S4. If NO, the process proceeds to step S7. The predetermined value is a current value at which it can be determined that the short-circuit failure continues.

As in the first embodiment, it is assumed that one of the switching elements 26PU of the U-phase P-side arm 20U of a certain inverter 4 has a short circuit failure. In the third embodiment, when a short circuit failure is detected in one of the switching elements 26PU of the U-phase P-side arm 20U in step S4, the switching elements 26 of the V-phase and W-phase N-side arms 21U are turned on in step S14. At the same time, the remaining switching elements 26 are turned off, and this state is continued until the current sensor 25 no longer detects a current of a predetermined value or more. As a result, as in the first embodiment, current concentrates on the short-circuited switching element 26PU, so that the short circuit portion is burned out and the regenerative current short circuit route is interrupted.
In the fusing process of the third embodiment, since no-load current flows through the motor 2, the current value of each phase is monitored by the current sensor 25, so that the switching element 26 that is short-circuited without turning off all the switching elements 26 is used. It can be detected whether or not fusing. Therefore, the fusing time and fusing power are minimized.

In addition to the effects (2) and (3) of the first embodiment, the third embodiment has the following effects.
(5) Motor 2 that has three-phase coil 24 and drives wheel 1, and 16 switching elements on P-side arm 20 and N-side arm 21 of three-phase leg 17 corresponding to three-phase coil 24, respectively 26 is connected in parallel, the DC power supplied from the battery 5 is converted into AC power and supplied to the motor 2, the short circuit fault detecting unit 6b for detecting the short circuit faulty switching element 26, the switching element When the short-circuit fault of 26 is detected, the inverter control unit 6c at the time of the short-circuit fault that turns on each switching element 26 on the different polarity side and different phase of the switching element 26 in which the short-circuit fault is detected, and turns off the remaining switching elements 26; , With.
Therefore, it is possible to suppress the generation of the regenerative current due to the short circuit failure of the switching element 26 without adding an interruption mechanism. Further, the switching element 26 having a short circuit failure can be blown, and the fusing time and fusing power can be minimized.

Example 4
The fourth embodiment is different from the first embodiment only in the configuration of the inverter 4. The same components as those in the first embodiment are denoted by the same reference numerals, and illustration and description thereof are omitted.
FIG. 7 is a configuration diagram of a motor drive circuit according to the fourth embodiment.
A fuse 28 is connected to the P-side arm 20 and the N-side arm 21 of the leg 17 in series with the switching element 26. The value at which the fuse 28 is blown (fuse capacity) is set to a value about 20 to 30% higher than the maximum current flowing in the arm during normal operation in consideration of the margin.

  In the fourth embodiment, when the current concentrates on the switching element 26 that is short-circuited due to the fusing process, either the switching element 26 or the fuse 28 that is short-circuited is blown first, so that the short-circuited part is burned out and regenerated. The short circuit route of current is interrupted. Here, since the fuse 28 is surely blown when the value of the flowing current exceeds the fuse capacity, the short-circuit failure portion can be blown more reliably as compared with the first to third embodiments in which only the switching element 26 is blown.

The fourth embodiment has the following effects in addition to the effects (1) to (3) of the first embodiment.
(6) A fuse 28 is connected in series with the switching element 26 to the P-side arm 20 and the N-side arm 21 of the leg 17.
Therefore, the short-circuit failure part can be blown out more reliably.

Example 5
The fifth embodiment is different from the third embodiment only in the configuration of the inverter 4. The same components as those in the third embodiment are denoted by the same reference numerals, and illustration and description thereof are omitted.
FIG. 8 is a configuration diagram of a motor drive circuit according to the fifth embodiment.
16 pairs of switching elements 29 are connected to the leg 17 in parallel. The switching element pair 29 is configured by connecting a P-side switching element 26P and an N-side switching element 26N in series, and an intermediate point 22 of the switching element pair 29 is connected to the corresponding phase of the coil 24 via a fuse 28. The power line 23 is connected.

  In the fifth embodiment, when the current concentrates on the switching element 26 that is short-circuited due to the fusing process, either the switching element 26 that is short-circuited or the fuse 28 is blown first, thereby including the switching element 26 that is short-circuited. The switching element pair 29 is disconnected from the AC power line 23. Thereby, the short circuit route of the regenerative current is interrupted. In the fifth embodiment, since the fuses 28 are provided between the switching element pair 29 and the AC power line 23, the number of fuses 28 is halved compared to the fourth embodiment, so that cost reduction and size reduction can be realized.

In addition to the effects (2) and (3) of the first embodiment and the effect (5) of the third embodiment, the fifth embodiment has the following effects.
(7) Leg 17 is a circuit in which 16 switching element pairs 29 in which a P-side switching element 26P and an N-side switching element 26N are connected in series are connected in parallel, and an intermediate point 22 of the switching element pair 29 is A corresponding phase AC power line 23 of the coil 24 is connected via the fuse 28.
Therefore, the short-circuit failure site can be blown out more reliably while suppressing the increase in cost and size.

Example 6
The sixth embodiment is different from the fourth embodiment only in the configuration of the inverter 4. The same components as those in the fourth embodiment are denoted by the same reference numerals, and illustration and description thereof are omitted.
FIG. 9 is a configuration diagram of a motor drive circuit according to the sixth embodiment.
The P-side arm 20 of the leg 17 has four switching element groups 30P connected in parallel. In the switching element set 30P, four switching elements 26 are connected in parallel. A fuse 28 is connected in series to the switching element set 30P.
The N-side arm 21 is the same as the P-side arm 20.

  In the sixth embodiment, when the current concentrates on the switching element 26 that is short-circuited due to the fusing process, either the switching element 26 or the fuse 28 that is short-circuited is blown first, so that the short-circuited part is burned out and regenerated. The short circuit route of current is interrupted. In the sixth embodiment, since the fuses 28 are provided in series with the switching element group 30 in which the four switching elements 26 are connected in parallel, the number of fuses 28 is reduced to 1/4 compared to the fourth embodiment, thereby reducing the cost. And downsizing can be realized.

In addition to the effects (1) to (3) of the first embodiment, the sixth embodiment has the following effects.
(8) The P-side arm 20 and the N-side arm 21 of the leg 17 are circuits in which four switching element sets 30 in which four switching elements 26 are connected in parallel are connected in parallel. The fuse 28 is connected in series.
Therefore, the short-circuit failure site can be blown out more reliably while suppressing the increase in cost and size.

Example 7
The seventh embodiment is different from the fifth embodiment only in the configuration of the inverter 4. The same components as those in the fifth embodiment are denoted by the same reference numerals, and illustration and description thereof are omitted.
FIG. 10 is a configuration diagram of a motor drive circuit according to the seventh embodiment.
The switching element pairs 29 are divided into four groups, and the switching element pairs 29 of the same group are connected to each other at the intermediate points 22 by intermediate point connection lines 31. The midpoint connection line 31 is connected to the AC power line 23 via the fuse 28.

  In the seventh embodiment, four intermediate points 22 of the switching element pair 29 are connected as a set by the intermediate point connection line 31, and the fuse 28 is provided between the intermediate point connection line 31 and the AC power line 23. The number of fuses 28 is reduced to 1/4 compared to the above, and cost and size can be reduced.

Example 7 has the following effects in addition to effects (2) and (3) of Example 1, effect (5) of Example 3, and effect (7) of Example 5.
(9) The switching element pairs 29 are divided into four groups, and the switching element pairs 29 of each group are connected to each other at the intermediate points 22 by the intermediate connection lines 31. The intermediate connection lines 31 are connected to each other through the fuses 28. The power line 23 is connected.
Therefore, cost increase and size increase can be further suppressed.

(Other examples)
As mentioned above, although the form for implementing this invention was demonstrated based on the Example, the concrete structure of this invention is not limited to an Example, The design change of the range which does not deviate from the summary of invention And the like are included in the present invention.
The present invention can be applied to an electric vehicle such as an electric vehicle, a hybrid vehicle, and a fuel cell vehicle that travels by the output torque of one or more electric motors.
The fusing treatment of Example 2 or 3 may be used for Examples 4 and 6. Further, the fusing treatment of Example 2 may be used for Examples 5 and 7.

1 wheel
2 Electric motor
3 Reducer
4 Inverter
5 High voltage battery
6 Motor controller
6a Inverter short-circuit judgment section
6b Element short-circuit fault detector
6c Inverter controller at short-circuit failure
7 Vehicle controller
8 Steering angle sensor
9 Accelerator position sensor
10 Brake pedal stroke sensor
11 Mode switch
12 Yaw rate sensor
13 Lateral acceleration sensor
14 Longitudinal acceleration sensor
15 Wheel speed sensor
16 DC power line
17 legs
18 Smoothing capacitor
19 High power relay
20 P side arm
21 N side arm
22 Midpoint
23 AC power line
24 coils
25 Current sensor
26 Switching element
27 Freewheeling diode
28 fuse
29 Switching element pairs
30 Switching element set
31 Intermediate connection line

Claims (9)

  1. An electric motor having a coil of a plurality of phases and driving a wheel;
    A plurality of switching elements are connected in parallel to the positive arm and the negative arm of the multi-phase legs corresponding to the multi-phase coils, respectively, and the electric power supplied from the power storage unit is converted into the AC power. An inverter supplied to the motor;
    An element short-circuit fault detection means for detecting a switching element having a short-circuit fault;
    When a short-circuit failure of the switching element is detected, an inverter control means at the time of a short-circuit fault that turns on each of the switching elements of the opposite polarity side and the same phase of the switching element in which the short-circuit failure is detected, and turns off the remaining switching elements;
    A driving force control device for an electric vehicle, comprising:
  2. An electric motor having a coil of a plurality of phases and driving a wheel;
    A plurality of switching elements are connected in parallel to the positive arm and the negative arm of the multi-phase legs corresponding to the multi-phase coils, respectively, and the electric power supplied from the power storage unit is converted into the AC power. An inverter supplied to the motor;
    Inverter short-circuit determining means for determining whether or not a short circuit has occurred in the inverter;
    When it is determined that a short circuit has occurred in the inverter, the inverter control means at the time of a short circuit fault that alternately turns on and off each switching element on the positive electrode side and each switching element on the negative electrode side,
    A driving force control device for an electric vehicle, comprising:
  3. An electric motor having a coil of a plurality of phases and driving a wheel;
    A plurality of switching elements are connected in parallel to the positive arm and the negative arm of the multi-phase legs corresponding to the multi-phase coils, respectively, and the electric power supplied from the power storage unit is converted into the AC power. An inverter supplied to the motor;
    An element short-circuit fault detection means for detecting a switching element having a short-circuit fault;
    When a short circuit fault of the switching element is detected, the inverter control means at the time of a short circuit fault that turns on each switching element on the different polarity side and different phase of the switching element in which the short circuit fault is detected, and turns off each remaining switching element;
    A driving force control device for an electric vehicle, comprising:
  4. In the driving force control device for an electric vehicle according to claim 1 or 3,
    Inverter short-circuit determining means for determining whether or not a short circuit has occurred in the inverter,
    When it is determined that a short circuit has occurred in the inverter, the inverter control means at the time of the short circuit failure turns off all the switching elements,
    The element short-circuit failure detecting means comprises: a means for detecting a switching element that has a short-circuit fault based on each phase current when all the switching elements are turned off. .
  5. In the driving force control device for an electric vehicle according to any one of claims 1 to 4,
    The short-circuit fault inverter control means comprises means for driving the electric motor while limiting the output using each normal switching element after the switching element in which the short-circuit fault has occurred. A driving force control device for an electric vehicle.
  6. In the driving force control device for an electric vehicle according to any one of claims 1 to 5,
    A driving force control device for an electric vehicle, wherein a fuse is connected in series with the switching element to a positive arm and a negative arm of each leg.
  7. In the driving force control device for an electric vehicle according to any one of claims 1 to 5,
    Each of the legs is a circuit in which a plurality of switching element pairs in which two switching elements are connected in series are connected in parallel.
    The driving force control device for an electric vehicle, wherein an intermediate point of each of the switching element pairs is connected to an AC power line of a corresponding phase of the coil via a fuse.
  8. In the driving force control device for an electric vehicle according to any one of claims 1 to 5,
    The positive side arm and the negative side arm of each leg are a circuit in which a plurality of switching element sets in which a plurality of switching elements are connected in parallel are connected in parallel,
    A driving force control device for an electric vehicle, wherein a fuse is connected in series to each of the switching element groups.
  9. The driving force control apparatus for an electric vehicle according to claim 7,
    Each switching element pair is divided into a plurality of sets,
    Each switching element pair of each set is connected to each other at an intermediate point by an intermediate connection line,
    Each intermediate point connection line is connected to the AC power line through the fuse, and the driving force control apparatus for an electric vehicle according to claim 1.
JP2015104658A 2015-05-22 2015-05-22 Driving force control device for electric vehicle Active JP6512549B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2015104658A JP6512549B2 (en) 2015-05-22 2015-05-22 Driving force control device for electric vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2015104658A JP6512549B2 (en) 2015-05-22 2015-05-22 Driving force control device for electric vehicle

Publications (2)

Publication Number Publication Date
JP2016220446A true JP2016220446A (en) 2016-12-22
JP6512549B2 JP6512549B2 (en) 2019-05-15

Family

ID=57578822

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2015104658A Active JP6512549B2 (en) 2015-05-22 2015-05-22 Driving force control device for electric vehicle

Country Status (1)

Country Link
JP (1) JP6512549B2 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5138027A (en) * 1974-09-27 1976-03-30 Hitachi Ltd Inbaatano koshoaamukirihanashihoshiki
JPH0265700A (en) * 1988-08-30 1990-03-06 Toyo Densan Kk Overvoltage preventing circuit for generator of automobile
US5491622A (en) * 1994-01-07 1996-02-13 Delco Electronics Corp. Power converter with emergency operating mode for three phase induction motors
JPH10243660A (en) * 1997-02-26 1998-09-11 Toshiba Corp Power converting apparatus
JP2005051901A (en) * 2003-07-31 2005-02-24 Fuji Electric Device Technology Co Ltd Power converter
JP2009106025A (en) * 2007-10-22 2009-05-14 Toyota Motor Corp Motor controller
JP2009142053A (en) * 2007-12-06 2009-06-25 Toyota Motor Corp Short-circuiting element determination apparatus for inverter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5138027A (en) * 1974-09-27 1976-03-30 Hitachi Ltd Inbaatano koshoaamukirihanashihoshiki
JPH0265700A (en) * 1988-08-30 1990-03-06 Toyo Densan Kk Overvoltage preventing circuit for generator of automobile
US5491622A (en) * 1994-01-07 1996-02-13 Delco Electronics Corp. Power converter with emergency operating mode for three phase induction motors
JPH10243660A (en) * 1997-02-26 1998-09-11 Toshiba Corp Power converting apparatus
JP2005051901A (en) * 2003-07-31 2005-02-24 Fuji Electric Device Technology Co Ltd Power converter
JP2009106025A (en) * 2007-10-22 2009-05-14 Toyota Motor Corp Motor controller
JP2009142053A (en) * 2007-12-06 2009-06-25 Toyota Motor Corp Short-circuiting element determination apparatus for inverter

Also Published As

Publication number Publication date
JP6512549B2 (en) 2019-05-15

Similar Documents

Publication Publication Date Title
US7471003B2 (en) Vehicular power control apparatus
JP3582523B2 (en) Electric load device, abnormality processing method, and computer-readable recording medium recording a program for causing a computer to execute electric load abnormality processing
US6239566B1 (en) Drive system for a permanently excited electric motor having at least one phase winding
EP2244370B1 (en) Motor drive apparatus, hybrid drive apparatus and method for controlling motor drive apparatus
US8045301B2 (en) Motor drive device
JP2008054420A (en) Motor drive unit
CN100472937C (en) Electric steering control device
Errabelli et al. Fault-tolerant voltage source inverter for permanent magnet drives
JP5653386B2 (en) Motor control device and electric power steering device using the same
KR101139146B1 (en) Electric motor control apparatus
US7819213B2 (en) Power output apparatus and vehicle having the same
JP4968698B2 (en) Electric motor control device
JP2007244133A (en) Ground detection device for motor drive circuit
JP2010200455A (en) Automobile and discharging method of smoothing capacitor
US8528689B2 (en) Motor drive apparatus and method, and electric power steering system using the same
JP5436592B2 (en) Motor control device, current control method applied to motor control device, and electric power steering device using motor control device
US9043066B2 (en) Vehicle and control method of vehicle
CN102237849B (en) Motor drive device
JPWO2009001468A1 (en) Power converter
JP2011223707A (en) Motor controller
US20130049665A1 (en) Drive system for rotating electric machine
CN101911473B (en) Winding change-over switch of three-phase AC motor
JP5760830B2 (en) Control device for three-phase rotating machine
JP2006280193A (en) Malfunction-determining device for drive circuit and drive unit equipped with the same, and method of determining malfunctions in the drive circuit
JP2010074915A (en) Motor controller and electric power steering device

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20180223

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20181212

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20181218

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20190130

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20190312

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20190401

R150 Certificate of patent or registration of utility model

Ref document number: 6512549

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150