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公开(公告)号：US20240261161A1
公开(公告)日：2024-08-08
申请号：US18426445
申请日：2024-01-30
Applicant: JTEKT CORPORATION
Inventor： Nobuyuki TOGASHI , Hiroshi KITAMOTO , Nobuaki IKEHARA , Riku NAGAYAMA , Chishin YOHENA
IPC: A61G5/04
CPC classification number: A61G5/048
Abstract: An electric wheelchair includes: a vehicle body; a first drive wheel; a second drive wheel; a first motor; a second motor; a first grip; a second grip; a first operation detection unit configured to detect a position of the first grip in a front-rear direction; a second operation detection unit configured to detect a position of the second grip in the front-rear direction; a first rotation speed detection unit; a second rotation speed detection unit; and a controller. The controller is configured to control the first motor and the second motor so as to turn the vehicle body, based on a difference between a displacement amount of the first grip and a displacement amount of the second grip and a difference between a rotation speed of the first drive wheel and a rotation speed of the second drive wheel.
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公开(公告)号：US20170315514A1
公开(公告)日：2017-11-02
申请号：US15493624
申请日：2017-04-21
Applicant: JTEKT CORPORATION
Inventor： Hiroshi KITAMOTO
CPC classification number: G05B13/02 , B62D5/0409 , B62D5/046 , B62D5/0463 , H02P21/22 , H02P25/22
Abstract: In an electric power steering system, an offset correction value setting unit corrects second offset correction values in a state where 100% of current command values is distributed to a first control unit, and 0% of the current command values is distributed to a second control unit. The offset correction value setting unit corrects first offset correction values in a state where 100% of the current command values is distributed to the second control unit, and 0% of the current command values is distributed to the first control unit.
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公开(公告)号：US20190149078A1
公开(公告)日：2019-05-16
申请号：US16185856
申请日：2018-11-09
Applicant: JTEKT CORPORATION
Inventor： Hiroshi SUMASU , Hiroshi KITAMOTO
CPC classification number: H02P27/08 , B62D5/04 , B62D5/0409 , B62D5/0463 , H02M1/44 , H02P21/00 , H02P21/22
Abstract: A first PWM count computation unit computes a first PWM count for each of three phases in a first system. A second PWM count computation unit computes a second PWM count for each of three phases in a second system. Upper and lower switching elements for each phase in the first system are controlled in accordance with a first pattern in which the upper and lower switching elements are varied in the order of an upper on state, a lower on state, and the upper on state from the time of start of PWM cycles. Upper and lower switching elements for each phase in the second system are controlled in accordance with a second pattern in which the upper and lower switching elements are varied in the order of a lower on state, an upper on state, and the lower on state from the time of start of PWM cycles.
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Patent Agency Ranking
公开(公告)号：US20170229983A1
公开(公告)日：2017-08-10
申请号：US15420669
申请日：2017-01-31
Applicant: JTEKT CORPORATION
Inventor： Hiroshi KITAMOTO
CPC classification number: H02P6/14 , B62D5/046 , B62D5/0484 , B62D5/0487 , H02M1/08 , H02P6/12 , H02P29/00 , H03K17/063
Abstract: A motor control apparatus includes an inverter, a driver, a negative voltage circuit, a voltage dividing circuit, and a detection unit. The inverter includes an upper-arm switching element and a lower-arm switching element to supply a voltage of a node between the upper-arm switching element and the lower-arm switching element to a motor as a phase voltage. The driver applies a first voltage or a second voltage to the upper-arm switching element to control and turn the upper-arm switching element on and off. The negative voltage circuit supplies a voltage lower than the voltage of the node to the driver as the second voltage. The voltage dividing circuit performs voltage division between the negative voltage circuit and a negative power supply. The detection unit outputs a signal based on a voltage resulting from the voltage division by the voltage dividing circuit.
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公开(公告)号：US20170365997A1
公开(公告)日：2017-12-21
申请号：US15621447
申请日：2017-06-13
Applicant: JTEKT CORPORATION
Inventor： Hiroshi KITAMOTO , Nobuhiro UCHIDA
CPC classification number: H02H9/02 , H02H3/006 , H02H3/08 , H02H5/041 , H02M1/32 , H03K17/08 , H03K17/0822 , H03K17/0828
Abstract: An overcurrent protection circuit includes an amplifier configured to amplify an inter-terminal voltage of a shunt resistor, an offset application circuit configured to allow the amplifier to provide an output with a predetermined offset voltage additionally applied thereto, a first comparator that compares an output voltage from the amplifier with a predetermined first reference voltage higher than the offset voltage to output a through-current sensing signal when the output voltage from the amplifier is higher than a first reference voltage, and an amplifier failure determination circuit that compares the output voltage from the amplifier with a predetermined second reference voltage that is higher than zero and lower than the offset voltage to output an amplification circuit failure determination signal corresponding to a result of the comparison.
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公开(公告)号：US20170240200A1
公开(公告)日：2017-08-24
申请号：US15433363
申请日：2017-02-15
Applicant: JTEKT CORPORATION
Inventor： Hiroshi KITAMOTO
IPC: B62D5/04 , H02P29/024 , H02P6/17 , H02M7/537 , H02P27/08
CPC classification number: B62D5/046 , H01L29/7786 , H02H7/1222 , H02H11/002 , H02M1/32 , H02M7/537 , H02P6/17 , H02P27/08 , H02P29/024
Abstract: An inverter includes a positive electrode terminal and a negative electrode terminal, upper-arm switching elements and lower-arm switching elements, and a voltage divider that supplies partial voltages of a voltage between the positive electrode terminal and the negative electrode terminal to a gate and a drain, respectively, of the lower-arm switching element. The lower-arm switching element includes an HEMT. In the voltage divider, the partial voltages are set to turn the lower-arm switching element off when a positive electrode and a negative electrode of a DC power supply are reversely connected to the positive electrode terminal and the negative electrode terminal, respectively.
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公开(公告)号：US20190149031A1
公开(公告)日：2019-05-16
申请号：US16183830
申请日：2018-11-08
Applicant: JTEKT CORPORATION
Inventor： Hiroshi KITAMOTO
IPC: H02M1/08 , H02M7/5387 , H02J3/38
CPC classification number: H02M1/08 , B62D5/0484 , B62D5/0487 , H02H7/08 , H02H7/0838 , H02H7/1225 , H02J3/38 , H02M7/53871 , H02M2001/007 , H02P27/06
Abstract: In an electric power converter, a driver unit includes an output unit, an auxiliary power source, a switch circuit unit, and a diode. The output unit includes first and second MISFETs and selectively outputs an on signal or an off signal to a gate electrode of a first HEMT. The auxiliary power source outputs a predetermined positive voltage. The switch circuit unit selectively connects a source electrode of the first MISFET to the auxiliary power source or a drain electrode of the first HEMT. The diode is connected to a source electrode of the second MISFET and is oriented such that forward current flows to a source electrode of the first HEMT. In the event of a short circuit in a certain HEMT, a microcomputer connects the source electrode of the first MISFET to the auxiliary power source and outputs an off command to the driver unit.
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公开(公告)号：US20140191625A1
公开(公告)日：2014-07-10
申请号：US14133220
申请日：2013-12-18
Applicant: JTEKT CORPORATION
Inventor： Hiroshi KITAMOTO
CPC classification number: G01R35/00 , G01D3/08 , G01D5/12 , G01D5/24485 , G01R33/02 , G01R33/07 , H02K11/215 , H02K11/25
Abstract: In an abnormality detection system for a rotation angle sensor, a fact that an abnormality has occurred in one of sine signals (S1, S2) or in one of cosine signals (S3, S4) is detected based on a sum of the electrical signals (S1, S2), and a sum of the electrical signals (S3, S4) (first detection result). A fact that an abnormality has occurred in one of the positive sine and cosine signals (S1, S3) or in one of the negative sine and cosine signals (S2, S4) by comparing a first temperature computed using a correlation between an amplitude and a temperature and based on the electrical signals (S1, S3), a second temperature computed using a correlation between the amplitude and a temperature and based on the electrical signals (S2, S4), and a third temperature detected by a temperature sensor with each other (second detection result). A microcomputer identifies which of the electrical signals is abnormal by comparing the first and second detection results with each other.
Abstract translation: 在用于旋转角度传感器的异常检测系统中，以正弦信号（S1，S2）或余弦信号（S3，S4）中的一个发生异常的事实是基于电信号 S1，S2）和电信号（S3，S4）的和（第一检测结果）。 通过比较使用振幅和幅度之间的相关性计算的第一温度，在正弦和余弦信号（S1，S3）之一或负正弦和余弦信号（S2，S4）中的一个中发生异常的事实 温度，并且基于电信号（S1，S3），使用振幅和温度之间的相关性并基于电信号（S2，S4）计算的第二温度和由温度传感器彼此检测的第三温度 （第二检测结果）。 通过比较第一和第二检测结果，微计算机识别哪个电信号是异常的。
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