Vehicle including rotating electric machine, inverter, and electronic control unit; and control method for the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02P-006/06
B60K-006/445
B60L-003/00
B60W-010/08
B60W-010/115
B60W-020/00
출원번호
US-0293402
(2014-06-02)
등록번호
US-9300233
(2016-03-29)
우선권정보
JP-2013-123383 (2013-06-12)
발명자
/ 주소
Uchida, Kenji
출원인 / 주소
TOYOTA JIDOSHA KABUSHIKI KAISHA
대리인 / 주소
Oliff PLC
인용정보
피인용 횟수 :
0인용 특허 :
3
초록▼
A vehicle including an AC rotating electric machine, an inverter, and an electronic control unit is provided. When an overcurrent abnormality occurs, i.e., phase current of a motor-generator exceeds a permissible value, in a high rotational speed region, the electronic control unit performs control
A vehicle including an AC rotating electric machine, an inverter, and an electronic control unit is provided. When an overcurrent abnormality occurs, i.e., phase current of a motor-generator exceeds a permissible value, in a high rotational speed region, the electronic control unit performs control (upshift control) for shifting up an automatic transmission provided between the motor-generator and driving wheels, or control (neutral control) for bringing the transmission into a released state, so as to reduce the rotational speed of the motor-generator. If phase current is detected even when an all-gate turn-off command is generated to the inverter while the rotational speed of the motor-generator is reduced to be within a low rotational speed region under the upshift control or neutral control, the electronic control unit determines that a short-circuit fault occurs in the inverter.
대표청구항▼
1. A vehicle comprising: an AC rotating electric machine coupled to a wheel of the vehicle;an inverter configured to supply phase current to the rotating electric machine; andan electronic control unit configured to perform reduction control for reducing a rotational speed of the rotating electric m
1. A vehicle comprising: an AC rotating electric machine coupled to a wheel of the vehicle;an inverter configured to supply phase current to the rotating electric machine; andan electronic control unit configured to perform reduction control for reducing a rotational speed of the rotating electric machine, when the phase current exceeds a permissible value to bring about an overcurrent abnormality during rotation of the rotating electric machine, whereinthe electronic control unit is configured to determine that a short-circuit fault occurs in the inverter, when the phase current flows in the rotating electric machine even when a command to bring the inverter into a gate turn-off state is generated while the rotational speed of the rotating electric machine is reduced to be lower than a threshold speed through the reduction control. 2. The vehicle according to claim 1, wherein the electronic control unit is configured to set the threshold speed, based on the rotational speed of the rotating electric machine obtained when back electromotive force produced in the rotating electric machine is equal to a DC voltage applied to the inverter. 3. The vehicle according to claim 2, wherein the threshold speed is a variable value calculated according to the DC voltage. 4. The vehicle according to claim 2, wherein the threshold speed is a fixed value set based on the DC voltage that is not raised nor lowered when applied to the inverter. 5. A vehicle comprising: an AC rotating electric machine coupled to a wheel of the vehicle;an inverter configured to supply phase current to the rotating electric machine;an electronic control unit configured to perform reduction control for reducing a rotational speed of the rotating electric machine, when the phase current exceeds a permissible value to bring about an overcurrent abnormality during rotation of the rotating electric machine; anda clutch device provided between the rotating electric machine and the wheel, the clutch device being configured to be placed in a selected one of an engaged state, a released state, and a slipping state, whereinthe electronic control unit is configured to reduce the rotational speed of the rotating electric machine through the reduction control, by placing the clutch device in the released state or the slipping state. 6. A vehicle comprising: an AC rotating electric machine coupled to a wheel of the vehicle;an inverter configured to supply phase current to the rotating electric machine;an electronic control unit configured to perform reduction control for reducing a rotational speed of the rotating electric machine, when the phase current exceeds a permissible value to bring about an overcurrent abnormality during rotation of the rotating electric machine; anda speed change device provided between the rotating electric machine and the wheel, the speed change device being configured to change a speed ratio, the speed ratio being a ratio of the rotational speed of the rotating electric machine to a rotational speed of the wheel, whereinthe electronic control unit is configured to reduce the rotational speed of the rotating electric machine through the reduction control, by shifting up the speed change device so as to reduce the speed ratio of the speed change device. 7. A vehicle comprising: an AC rotating electric machine coupled to a wheel of the vehicle;an inverter configured to supply phase current to the rotating electric machine;an electronic control unit configured to perform reduction control for reducing a rotational speed of the rotating electric machine, when the phase current exceeds a permissible value to bring about an overcurrent abnormality during rotation of the rotating electric machine,wherein the AC rotating electric machine is a second rotational electric machine, and the inverter is a second inverter;a first rotating electric machine coupled to the second rotating electric machine via a gear unit;a first inverter configured to supply phase current to the first rotating electric machine;a power storage device connected to the second rotating electric machine via the second inverter and connected to the first rotating electric machine via the first inverter; and a speed change device provided between one of the first rotating electric machine and the second rotating electric machine, and the wheel, the speed change device being configured to be placed in a selected one of an engaged state, a slipping state, and a released state, and the speed change device being configured to change a speed ratio of the speed change device in the engaged state,wherein the electronic control unit is configured to: i) reduce the rotational speed of said one of the first rotating electric machine and the second rotating electric machine in which the overcurrent abnormality occurs, through the reduction control, when the overcurrent abnormality occurs to one of the first rotating electric machine and the second rotating electric machine, andii) determine that a short-circuit fault occurs in the inverter corresponding to said one of the first rotating electric machine and the second rotating electric machine in which the overcurrent abnormality occurs, when phase current flows in said one of the first rotating electric machine and the second rotating electric machine even when a command to bring the inverter corresponding to said one of the first rotating electric machine and the second rotating electric machine into a gate turn-off condition is generated, while the rotational speed of said one of the first rotating electric machine and the second rotating electric machine is reduced to be lower than a threshold speed through the reduction control. 8. The vehicle according to claim 7, wherein the electronic control unit is configured to set the threshold speed of the first rotating electric machine and the threshold speed of the second rotating electric machine, based on the rotational speed of the first rotating electric machine and the rotational speed of the second rotating electric machine obtained when back electromotive force is equal to a DC voltage applied to each of the first inverter and the second inverter, the back electromotive force is produced in the first rotating electric machine and the second rotating electric machine. 9. The vehicle according to claim 8, wherein the threshold speed is a variable value calculated according to the DC voltage. 10. The vehicle according to claim 8, wherein the threshold speed is a fixed value set based on the DC voltage that is not raised nor lowered when applied to each of the first inverter and the second inverter. 11. The vehicle according to claim 7, wherein: the electronic control unit is configured to reduce the rotational speed of said one of the first rotating electric machine and the second rotating electric machine in which the overcurrent abnormality occurs, through the reduction control, by causing the other rotating electric machine in which no overcurrent abnormality occurs to produce regenerative torque while placing the speed change device in the released state or the slipping state, when electric power that can be received by the power storage device is equal to or larger than a predetermined value; andthe electronic control unit is configured to reduce the rotational speed of said one of the first rotating electric machine and the second rotating electric machine in which the overcurrent abnormality occurs, through the reduction control, by changing a speed ratio of the speed change device, when the electric power that can be received by the power storage device is smaller than the predetermined value. 12. The vehicle according to claim 7, wherein: the electronic control unit is configured to reduce the rotational speed of said one of the first rotating electric machine and the second rotating electric machine in which the overcurrent abnormality occurs, through the reduction control, by causing the other rotating electric machine in which no overcurrent abnormality occurs to produce regenerative torque while placing the speed change device in the released state or the slipping state, when electric power that can be received by the power storage device is equal to or larger than a predetermined value; andthe electronic control unit is configured to reduce the rotational speed of said one of the first rotating electric machine and the second rotating electric machine in which the overcurrent abnormality occurs, through the reduction control, by keeping the speed change device in the released state without changing a speed ratio of the speed change device, when the electric power that can be received by the power storage device is smaller than the predetermined value, and the speed ratio of the speed change device cannot be changed. 13. A control method for a vehicle, the vehicle including an AC rotating electric machine coupled to a wheel of the vehicle, an inverter configured to supply phase current to the rotating electric machine, and an electronic control unit, the control method comprising: performing, by the electronic control unit, reduction control for reducing a rotational speed of the rotating electric machine, when the phase current exceeds a permissible value to bring about an overcurrent abnormality during rotation of the rotating electric machine; anddetermining, by the electronic control unit, that a short-circuit fault occurs in the inverter, when the phase current flows in the rotating electric machine even when a command to bring the inverter into a gate turn-off state is generated while the rotational speed of the rotating electric machine is reduced to be lower than a threshold speed through the reduction control.
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이 특허에 인용된 특허 (3)
Suzuki,Takehiko; Yamaguchi,Yasuo; Wakuta,Satoru, Driving control device and method for electric vehicle and program therefor.
Tabata Atsushi,JPX ; Taga Yutaka,JPX ; Ibaraki Ryuji,JPX ; Hata Hiroshi,JPX ; Mikami Tsuyoshi,JPX, Hybrid vehicle drive system adapted to prevent concurrent mode change and transmission shifting or torque distribution.
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