Patents by Inventor Toshifumi Yamakawa
Toshifumi Yamakawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240133824Abstract: A defect inspection device includes: an illumination optical system including a polarization element configured to switch polarization of irradiation light between first polarization and second polarization orthogonal to the first polarization; a polarization diffraction grating configured to emit diffraction light of a specific order of the irradiation light in a direction along a normal line of a sample stage surface, a diffraction efficiency of the specific order of the first polarization of the irradiation light is equal to or less than 20% of a diffraction efficiency of the specific order of the second polarization, the polarization diffraction grating being settable at a light collection position of the irradiation light on the sample stage surface and including an anisotropic pattern whose period is equal to or less than twice a wavelength of the irradiation light; a detection optical system.Type: ApplicationFiled: March 9, 2021Publication date: April 25, 2024Inventors: Yuta URANO, Eiji ARIMA, Hiromichi YAMAKAWA, Toshifumi HONDA
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Publication number: 20240096667Abstract: A defect inspection device in which an optical axis of a detection optical system is inclined with respect to a surface of a sample, and an imaging sensor is inclined with respect to the optical axis, a height variation amount of an illumination spot in a normal direction of the surface of the sample is calculated based on an output of a height measuring unit, a deviation amount of the focusing position with respect to the light receiving surface in an optical axis direction of the detection optical system is calculated based on the height variation amount of the illumination spot, the deviation amount of the focusing position being generated accompanying a height variation of the illumination spot, and the focus actuator is controlled based on the deviation amount of the focusing position, and scattered light intensities at the same coordinates of the sample are added.Type: ApplicationFiled: January 29, 2021Publication date: March 21, 2024Inventors: Hiromichi YAMAKAWA, Toshifumi HONDA, Yuta URANO, Shunichi MATSUMOTO, Masaya YAMAMOTO, Eiji ARIMA
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Publication number: 20230139350Abstract: A controller disclosed in the specification is implemented in an electrified vehicle in which a motor generator used to drive a wheel is connected to a battery via a DC-DC converter. The controller is configured to be able to execute a process of acquiring a target value of output voltage of the DC-DC converter, a process of acquiring a measured value of the output voltage of the DC-DC converter, a process of acquiring a direction of reactor current flowing through a reactor of the DC-DC converter, and a process of executing feedback control over an operation of the DC-DC converter in accordance with a deviation of the measured value from the target value of the output voltage. The process of executing feedback control may include a process of determining a feedback gain that varies with the direction of the reactor current.Type: ApplicationFiled: September 1, 2022Publication date: May 4, 2023Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventor: Toshifumi YAMAKAWA
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Patent number: 11183962Abstract: There is provided a driving system including a motor; an inverter configured to drive the motor; a power storage device connected with the inverter via a power line; a smoothing capacitor mounted to the power line; a voltage sensor configured to detect a voltage of the smoothing capacitor; a current sensor configured to detect an electric current of each phase of the motor; and a control device configured to control the inverter, based on a detected value of the current sensor. The control device performs Fourier series expansion of a detected value of the voltage sensor to calculate an electrical first variation component of the voltage of the smoothing capacitor. The control device controls the inverter, such that the electrical first variation component of the voltage of the smoothing capacitor becomes equal to a value 0.Type: GrantFiled: February 5, 2020Date of Patent: November 23, 2021Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Koji Irie, Hiroyuki Oyanagi, Toshifumi Yamakawa
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Publication number: 20200259445Abstract: There is provided a driving system including a motor; an inverter configured to drive the motor; a power storage device connected with the inverter via a power line; a smoothing capacitor mounted to the power line; a voltage sensor configured to detect a voltage of the smoothing capacitor; a current sensor configured to detect an electric current of each phase of the motor; and a control device configured to control the inverter, based on a detected value of the current sensor. The control device performs Fourier series expansion of a detected value of the voltage sensor to calculate an electrical first variation component of the voltage of the smoothing capacitor. The control device controls the inverter, such that the electrical first variation component of the voltage of the smoothing capacitor becomes equal to a value 0.Type: ApplicationFiled: February 5, 2020Publication date: August 13, 2020Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Koji IRIE, Hiroyuki OYANAGI, Toshifumi YAMAKAWA
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Patent number: 10363831Abstract: A power system has a first converter; a second converter; a first controller for generating a first command and a second command, controlling the first converter on the basis of the first command, and transmitting the second command to a second controller; and the second controller for controlling the second converter on the basis of the second command. The first controller adjusts the first command to cancel at least one of shortage and excess of second current by first current. The second controller controls the second converter on the basis of the second command when the first command is smaller than first upper limit. The second controller controls the second converter on the basis of second upper limit when the first command reaches the first upper limit.Type: GrantFiled: December 20, 2016Date of Patent: July 30, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi Yamakawa, Masaki Okamura
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Publication number: 20190214907Abstract: The boost system performs switching control of a first switching element and a second switching element, based on a result of comparison between the boost carrier and a duty command based on a required duty, with regard to each of a decreasing region where the boost carrier decreases and an increasing region where the boost carrier increases. The boost system sets the required duty to the duty command, with regard to the greater between the required duty in the decreasing region and the required duty in the increasing region, while setting the duty command by imposing a limitation on the required duty by lower limit guarding, such that an average duty in each one period of the boost carrier becomes equal to or greater than a lower limit duty, with regard to the smaller between the required duty in the decreasing region and the required duty in the increasing region.Type: ApplicationFiled: January 9, 2019Publication date: July 11, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi YAMAKAWA, Ryo KAMIKAWA, Kazuhito HAYASHI, Kota OGURA, Koji IRIE
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Patent number: 10250171Abstract: An electric motor control apparatus controls an electric motor system that includes a power converter including switching elements and a three-phase alternating-current motor. The electric motor control apparatus includes generating devices for generating modulation signals by respectively adding corresponding triple harmonic signals to phase voltage command signals and a control device for controlling switching elements on the basis of a magnitude relation between each of the modulation signals and a carrier signal. Each of the triple harmonic signals includes a signal component that increases the absolute value of a peak value of a signal level of the corresponding modulation signal above the absolute value of a peak value of a signal level of the carrier signal in a corresponding one of phases.Type: GrantFiled: September 10, 2014Date of Patent: April 2, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi Yamakawa, Masaki Okamura, Naoyoshi Takamatsu
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Patent number: 10224857Abstract: Provided is a motor controller that controls a motor system including: a power converter, a smoothing capacitor, a three-phase AC motor, and a current sensor. The motor controller is provided with an electronic control unit. The electronic control unit specifies a target phase that is a phase of a second phase voltage command signal having a largest difference from a first phase voltage command signal having a signal level that is neither a maximum nor a minimum signal level, based on three phase voltage command signals generated from the detection value of the current sensor, and corrects the detection value of the current sensor, which detects the phase current of the target phase, such that a terminal voltage of the smoothing capacitor matches the desired voltage value.Type: GrantFiled: September 8, 2014Date of Patent: March 5, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi Yamakawa, Masaki Okamura, Naoyoshi Takamatsu
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Patent number: 10164551Abstract: A boost control apparatus is provided with: a controlling device configured (i) to perform first duty control by a first control parameter if output current that flows through a reactor is not near zero, and (ii) to perform second duty control by a second control parameter if the output current is near zero, during one-side element control for driving only one of a first switching element and a second switching element, each of which is connected to a reactor in series. A rate calculating device is provided that is configured to calculate a change rate of the output current to a change amount of a duty value in the first duty control and the second duty control. A control determining device is also provided that is configured to control the controlling device to perform the second duty control regardless of the output current, if the change rate is less than a predetermined value.Type: GrantFiled: February 11, 2016Date of Patent: December 25, 2018Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi Yamakawa, Masaki Okamura, Naoyoshi Takamatsu
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Patent number: 10103664Abstract: A vehicle control apparatus is provided with: a modulator configured to generate modulation signals; a first corrector configured to perform a first correction process in which a center value of the modulation signals is corrected to reduce a loss in the inverter; a second corrector configured to perform a second correction process in which an amplitude shift and a phase shift of the third harmonic signal with respect to the voltage command signals are reduced; and a controller configured (i) to control the first corrector to perform the first correction process if the DC voltage is greater than or equal to first predetermined voltage and (ii) to control the second corrector to perform the second correction process if the DC voltage is less than the first predetermined voltage, when a number of revolutions of the AC motor is less than a predetermined number of revolutions.Type: GrantFiled: September 29, 2017Date of Patent: October 16, 2018Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi Yamakawa, Shintaro Tsujii, Masaki Okamura
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Patent number: 10069396Abstract: A power system has a first control apparatus configured to generating a first command signal and a second command signal, to control the first converter on the basis of the first command signal, and to transmit the second command signal to a second control apparatus and the second control apparatus configured to control the second converter on the basis of the received second command signal. When it is requested that a state of each of the first and second converters is changed from a first state to a second state, the first control apparatus generates the first and second command signals so that the state of the second converter is changed to a third state in which both of the upper arm and the lower arm keep being in the OFF state, then the state of the first converter is changed from the first state to the second state, and then the state of the second converter is changed from the third state to the second state.Type: GrantFiled: December 11, 2017Date of Patent: September 4, 2018Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kosuke Hirano, Masaki Okamura, Toshifumi Yamakawa, Jun Fujita, Ryo Kamikawa
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Publication number: 20180166967Abstract: A power system has a first control apparatus configured to generating a first command signal and a second command signal, to control the first converter on the basis of the first command signal, and to transmit the second command signal to a second control apparatus and the second control apparatus configured to control the second converter on the basis of the received second command signal. When it is requested that a state of each of the first and second converters is changed from a first state to a second state, the first control apparatus generates the first and second command signals so that the state of the second converter is changed to a third state in which both of the upper arm and the lower arm keep being in the OFF state, then the state of the first converter is changed from the first state to the second state, and then the state of the second converter is changed from the third state to the second state.Type: ApplicationFiled: December 11, 2017Publication date: June 14, 2018Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kosuke HIRANO, Masaki OKAMURA, Toshifumi YAMAKAWA, Jun FUJITA, Ryo KAMIKAWA
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Patent number: 9979344Abstract: A controller for an electric motor system is provided. The electric motor system includes a DC power supply, a power converter, a smoothing capacitor, a three-phase AC motor, and a current sensor. The controller includes an electronic control unit. The electronic control unit is configured to control the power converter such that an inter-terminal voltage of the smoothing capacitor matches a first reference value. The first reference value is a value which is determined as the inter-terminal voltage of the smoothing capacitor when a phase current is equal to a second reference value. The electronic control unit is configured to correct a detection value of the current sensor so as to decrease a difference between the detection value and the second reference value when the inter-terminal voltage matches the first reference value and the detection value does not match the second reference value.Type: GrantFiled: July 13, 2015Date of Patent: May 22, 2018Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi Yamakawa, Masaki Okamura, Naoyoshi Takamatsu
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Publication number: 20180097464Abstract: A vehicle control apparatus is provided with: a modulator configured to generate modulation signals; a first corrector configured to perform a first correction process in which a center value of the modulation signals is corrected to reduce a loss in the inverter; a second corrector configured to perform a second correction process in which an amplitude shift and a phase shift of the third harmonic signal with respect to the voltage command signals are reduced; and a controller configured (i) to control the first corrector to perform the first correction process if the DC voltage is greater than or equal to first predetermined voltage and (ii) to control the second corrector to perform the second correction process if the DC voltage is less than the first predetermined voltage, when a number of revolutions of the AC motor is less than a predetermined number of revolutions.Type: ApplicationFiled: September 29, 2017Publication date: April 5, 2018Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi YAMAKAWA, Shintaro TSUJII, Masaki OKAMURA
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Patent number: 9837888Abstract: A boost control apparatus is provided with a current value change amount detecting device configured to detect a change amount of output current that flows through the reactor in a first predetermined period during one-side element control for driving only one of a first switching element and a second switching element. A determining device is provided that is configured to determine that the output current is near zero if the change amount is less than a predetermined threshold value. A controlling device is also provided that is configured (i) to perform first duty control by a first control parameter if the output current is not near zero, and (ii) to perform second duty control by a second control parameter, which is different from the first control parameter, if the output current is near zero.Type: GrantFiled: February 11, 2016Date of Patent: December 5, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi Yamakawa, Masaki Okamura, Naoyoshi Takamatsu
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Patent number: 9825529Abstract: A voltage conversion control apparatus is a voltage conversion control apparatus which controls a voltage converter having an upper switching element and a lower switching element, and has a calculating device which calculates duty ratio such that output current of an electricity storage apparatus reaches target value and the duty ratio is within predetermined allowable range; a limit relaxing device which relaxes at least one of upper limit value and lower limit value of the allowable range on the basis of magnitude relationship between predetermined threshold value and current deviation which is obtained by subtracting the output current from the target value; and a controlling device which controls the upper switching element and the lower switching element to perform a switching control on the basis of the duty ratio which is calculated by the calculating device.Type: GrantFiled: September 30, 2013Date of Patent: November 21, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Naoyoshi Takamatsu, Masaki Okamura, Toshifumi Yamakawa
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Publication number: 20170214355Abstract: A controller for an electric motor system is provided. The electric motor system includes a DC power supply, a power converter, a smoothing capacitor, a three-phase AC motor, and a current sensor. The controller includes an electronic control unit. The electronic control unit is configured to control the power converter such that an inter-terminal voltage of the smoothing capacitor matches a first reference value. The first reference value is a value which is determined as the inter-terminal voltage of the smoothing capacitor when a phase current is equal to a second reference value. The electronic control unit is configured to correct a detection value of the current sensor so as to decrease a difference between the detection value and the second reference value when the inter-terminal voltage matches the first reference value and the detection value does not match the second reference value.Type: ApplicationFiled: July 13, 2015Publication date: July 27, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi YAMAKAWA, Masaki OKAMURA, Naoyoshi TAKAMATSU
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Publication number: 20170182911Abstract: A power system has a first converter; a second converter; a first controller for generating a first command and a second command, controlling the first converter on the basis of the first command, and transmitting the second command to a second controller; and the second controller for controlling the second converter on the basis of the second command. The first controller adjusts the first command to cancel at least one of shortage and excess of second current by first current. The second controller controls the second converter on the basis of the second command when the first command is smaller than first upper limit. The second controller controls the second converter on the basis of second upper limit when the first command reaches the first upper limit.Type: ApplicationFiled: December 20, 2016Publication date: June 29, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi YAMAKAWA, Masaki OKAMURA
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Patent number: 9553541Abstract: The purpose is to suppress ripple of voltage between terminals of smoothing condenser. Electric motor control apparatus is electric motor control apparatus that controls electric motor system having electrical power converter, smoothing condenser and three-phase AC electric motor, and has generating device that generates modulation signal by adding third harmonic signal to phase voltage command signal; controlling device that controls operation of electrical power converter by using modulation signal; and adjusting device that adjusts amplitude of third harmonic signal, adjusting device adjusts amplitude of third harmonic signal so that peak value of voltage between terminals of smoothing condenser in the case where amplitude of third harmonic signal is adjusted is smaller than peak value of voltage between terminals in the case where amplitude of third harmonic signal is not adjusted.Type: GrantFiled: November 6, 2013Date of Patent: January 24, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Toshifumi Yamakawa, Masaki Okamura, Naoyoshi Takamatsu