Patents by Inventor Yoshinari Murayama
Yoshinari Murayama 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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Patent number: 10202042Abstract: A power conversion system includes a controller to control discharge of a smoothing condenser based on at least one signal received through an input. The at least one signal indicates a failure of a discharge circuit configured to discharge the smoothing condenser The controller controls discharge of stored charge in the smoothing condenser through parasitic resistance components of a power system which includes the smoothing condenser. The power conversion system may be used with an electric vehicle.Type: GrantFiled: September 4, 2014Date of Patent: February 12, 2019Assignee: SAMSUNG SDI CO., LTD.Inventors: Futoshi Yamane, Masami Ishikawa, Mitsutoshi Muraoka, Taro Yoshida, Yoshinari Murayama, Kenji Furusawa
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Patent number: 10046646Abstract: A power conversion system including a DC main power supply for supplying a DC voltage, boosting circuits for performing a retrogression operation of boosting the DC voltage and comprising driving circuits, an inverter circuit for converting the DC voltage into an AC voltage, a motor/generator for receiving the AC voltage, and a control circuit for outputting a control signal to the driving circuits and stopping an operation of a faulty boosting circuit of the boosting circuits when one of the boosting circuits is faulty, for setting power control values depending on a number of remaining non-faulty boosting circuits of the boosting circuits, and for controlling the remaining non-faulty boosting circuits and the inverter circuit based on the power control values, wherein the inverter circuit and the boosting circuits perform a regeneration operation of supplying regeneration power to the DC main power supply, peripheral equipment, and/or a DC auxiliary power supply.Type: GrantFiled: July 31, 2014Date of Patent: August 14, 2018Assignee: Samsung SDI Co., Ltd.Inventors: Futoshi Yamane, Masami Ishikawa, Yoshinari Murayama, Mitsutoshi Muraoka, Taro Yoshida, Kenji Furusawa
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Patent number: 9403438Abstract: A control device for a hybrid vehicle includes: a current command value calculator configured to calculate torque and a weak field current command values input to the inverter; and a current command value correction calculator configured to calculate torque and weak field current correction values added to the torque and weak field current command values, wherein when an accumulation of electricity of the electricity storage device is equal to or larger than a reference value, the current command value calculator is configured to calculate the torque and weak field current command values to make a load applied to the engine by the motor generator zero, and the current command value correction calculator is configured to calculate the torque and weak field current correction values to make a load applied to the engine by the motor driving system other than the motor generator zero.Type: GrantFiled: July 11, 2014Date of Patent: August 2, 2016Assignee: Samsung SDI Co., Ltd.Inventors: Futoshi Yamane, Masami Ishikawa, Yoshinari Murayama, Mitsutoshi Muraoka, Taro Yoshida, Kenji Furusawa
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Patent number: 9246419Abstract: A method for controlling a motor to enable drive assist of an engine with a high torque in a low rotation speed range as well as synchronized driving in a high rotation speed range. The method includes controlling a motor connected to a low voltage battery. The motor has a reluctance torque higher than a magnetic torque at a time of a highest torque generation. The motor includes a rotor connected to an output shaft of an engine.Type: GrantFiled: October 30, 2013Date of Patent: January 26, 2016Assignee: Samsung SDI Co., Ltd.Inventors: Yoshinari Murayama, Futoshi Yamane
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Publication number: 20150097426Abstract: A power conversion system includes a controller to control discharge of a smoothing condenser based on at least one signal received through an input. The at least one signal indicates a failure of a discharge circuit configured to discharge the smoothing condenser The controller controls discharge of stored charge in the smoothing condenser through parasitic resistance components of a power system which includes the smoothing condenser. The power conversion system may be used with an electric vehicle.Type: ApplicationFiled: September 4, 2014Publication date: April 9, 2015Inventors: Futoshi YAMANE, Masami ISHIKAWA, Mitsutoshi MURAOKA, Taro YOSHIDA, Yoshinari MURAYAMA, Kenji FURUSAWA
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Publication number: 20150097501Abstract: An electric vehicle power conversion system may include an exclusive discharge circuit for discharging stored charges of a smoothing condenser. The electric vehicle power conversion system may also include a discharge controller for driving a DC/DC converter if a control circuit for controlling the electric vehicle power conversion system detects a fault of an exclusive discharge circuit, such that the stored charges of the smoothing condenser may be supplied to auxiliary devices or a DC auxiliary power supply and be discharged therethrough.Type: ApplicationFiled: September 10, 2014Publication date: April 9, 2015Inventors: Futoshi YAMANE, Masami ISHIKAWA, Mitsutoshi MURAOKA, Taro YOSHIDA, Kenji FURUSAWA, Yoshinari MURAYAMA
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Publication number: 20150069832Abstract: A power conversion system including a DC main power supply for supplying a DC voltage, boosting circuits for performing a retrogression operation of boosting the DC voltage and comprising driving circuits, an inverter circuit for converting the DC voltage into an AC voltage, a motor/generator for receiving the AC voltage, and a control circuit for outputting a control signal to the driving circuits and stopping an operation of a faulty boosting circuit of the boosting circuits when one of the boosting circuits is faulty, for setting power control values depending on a number of remaining non-faulty boosting circuits of the boosting circuits, and for controlling the remaining non-faulty boosting circuits and the inverter circuit based on the power control values, wherein the inverter circuit and the boosting circuits perform a regeneration operation of supplying regeneration power to the DC main power supply, peripheral equipment, and/or a DC auxiliary power supply.Type: ApplicationFiled: July 31, 2014Publication date: March 12, 2015Inventors: Futoshi Yamane, Masami Ishikawa, Yoshinari Murayama, Mitsutoshi Muraoka, Taro Yoshida, Kenji Furusawa
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Publication number: 20150069935Abstract: A control device for a hybrid vehicle includes: a current command value calculator configured to calculate torque and a weak field current command values input to the inverter; and a current command value correction calculator configured to calculate torque and weak field current correction values added to the torque and weak field current command values, wherein when an accumulation of electricity of the electricity storage device is equal to or larger than a reference value, the current command value calculator is configured to calculate the torque and weak field current command values to make a load applied to the engine by the motor generator zero, and the current command value correction calculator is configured to calculate the torque and weak field current correction values to make a load applied to the engine by the motor driving system other than the motor generator zero.Type: ApplicationFiled: July 11, 2014Publication date: March 12, 2015Inventors: Futoshi Yamane, Masami Ishikawa, Yoshinari Murayama, Mitsutoshi Muraoka, Taro Yoshida, Kenji Furusawa
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Publication number: 20140217933Abstract: A method for controlling a motor to enable drive assist of an engine with a high torque in a low rotation speed range as well as synchronized driving in a high rotation speed range. The method includes controlling a motor connected to a low voltage battery. The motor has a reluctance torque higher than a magnetic torque at a time of a highest torque generation. The motor includes a rotor connected to an output shaft of an engine.Type: ApplicationFiled: October 30, 2013Publication date: August 7, 2014Applicant: SAMSUNG SDI CO., LTD.Inventors: Yoshinari Murayama, Futoshi Yamane
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Patent number: 7872435Abstract: A motor control apparatus provided with an inverter for successively commutating the current to a motor using a PWM signal; a PWM signal generating device for generating the PWM signal using a carrier signal; a rotational state quantity sensor for detecting a rotational state quantity; a phase difference detecting device for detecting the phase difference between the carrier signal and the rotational period based on the rotational state quantity; a frequency setting device for setting a frequency of the carrier signal to a value in accordance with a multiplier for one period in terms of electrical angle of the rotational period of the motor, when the rotational frequency is equal to or greater than a specified frequency and the phase difference is equal to or less than a specified value; and a synchronizing device for synchronizing a control period of the carrier signal to the rotational period.Type: GrantFiled: April 22, 2008Date of Patent: January 18, 2011Assignee: Honda Motor Co., Ltd.Inventors: Nobuyuki Imai, Yoshinari Murayama, Junji Inoue
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Publication number: 20080265831Abstract: A motor control apparatus provided with an inverter for successively commutating the current to a motor using a PWM signal; a PWM signal generating device for generating the PWM signal using a carrier signal; a rotational state quantity sensor for detecting a rotational state quantity; a phase difference detecting device for detecting the phase difference between the carrier signal and the rotational period based on the rotational state quantity; a frequency setting device for setting a frequency of the carrier signal to a value in accordance with a multiplier for one period in terms of electrical angle of the rotational period of the motor, when the rotational frequency is equal to or greater than a specified frequency and the phase difference is equal to or less than a specified value; and a synchronizing device for synchronizing a control period of the carrier signal to the rotational period.Type: ApplicationFiled: April 22, 2008Publication date: October 30, 2008Applicant: HONDA MOTOR CO., LTDInventors: Nobuyuki IMAI, Yoshinari Murayama, Junji Inoue