Patents by Inventor Natsuki Nozawa
Natsuki Nozawa 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: 9933795Abstract: A cooler includes an estimator. The estimator is configured to estimate a coolant temperature from a measurement value of the temperature sensor. The estimator is configured to determine a difference by subtracting an immediately preceding measurement value from a current measurement value, determine a correction value from the difference, and output an estimated value of the coolant temperature. The estimated value is obtained by adding the correction value to the current measurement value. The correction value is obtained by multiplying a gain by the difference. The gain is determined from a time constant, the gain is determined according to a flow rate of the coolant. The time constant is obtained when a transfer function of heat transferred from the coolant to the temperature sensor is modeled as a first order lag system.Type: GrantFiled: June 11, 2015Date of Patent: April 3, 2018Assignee: Toyota Jidosha Kabushiki KaishaInventors: Etsushi Taguchi, Natsuki Nozawa
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Patent number: 9912089Abstract: An electrical connector is disclosed having a terminal housing, a female terminal, and a holding protrusion. The female terminal is positioned in the terminal housing and has a terminal body into which a complementary male terminal may be inserted and extracted. The holding protrusion projects from the terminal body in a direction orthogonal to inserting and extracting directions, and is press-fitted in the terminal receiving terminal housing.Type: GrantFiled: February 4, 2015Date of Patent: March 6, 2018Assignees: Tyco Electronics Japan G.K., Toyota Jidosha Kabushiki KaishaInventors: Tetsuro Akiguchi, Kazuhiko Ueda, Natsuki Nozawa, Hitoshi Ozaki, Masao Noguchi, Arata Harada
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Patent number: 9709444Abstract: The specification is related to a motor controller, a vehicle including the motor controller and a heat stress estimating method for a switching element. The motor controller includes a switching element, a temperature sensor, and a computer. The switching element is configured to convert output electric power of an electric power supply into motor-driving electric power. The temperature sensor is configured to measure a temperature of the switching element. The computer is configured to extract a maximum point and a minimum point in a time-dependent change in the temperature of the switching element, the computer is configured to calculate a temperature difference between the maximum point and the minimum point adjacent to each other and configured to calculate an estimated value of a heat stress to which the switching element is subjected based on each calculated temperature difference.Type: GrantFiled: November 30, 2015Date of Patent: July 18, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Natsuki Nozawa, Etsushi Taguchi, Kento Taguri
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Patent number: 9509069Abstract: An electrical connector is disclosed having a housing and a female terminal. The housing has an assembly receiving space. The female terminal is positioned in the assembly receiving space and has a first female terminal, a second female terminal, and an elastic connecting spring. The first female terminal has a first contact receiving space. The second female terminal has a second contact receiving space and is independently displaceable relative to the first female terminal along a longitudinal axis. The elastic connecting spring connects the first female terminal to the second female terminal.Type: GrantFiled: December 22, 2014Date of Patent: November 29, 2016Assignees: Tyco Electronics Japan G.K., Toyota Jidosha Kabushiki KaishaInventors: Ryuichi Komiyama, Tetsuro Akiguchi, Yoshifumi Suemitsu, Kazuhiko Ueda, Natsuki Nozawa, Hitoshi Ozaki, Masao Noguchi, Arata Harada
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Patent number: 9502815Abstract: An electrical connector is disclosed having a terminal housing and a female type terminal positioned in the terminal housing. The terminal housing has a first terminal housing, and a second terminal housing positioned independent from the first terminal housing. The female type terminal has a first female terminal, second female terminal, and a coupling member. The first female terminal is positioned in the first terminal housing and is electrically connected to a first male terminal. The second female terminal is positioned in the second terminal housing and is electrically connected to a second male terminal. The coupling member connects the first female terminal to the second female terminal.Type: GrantFiled: February 4, 2015Date of Patent: November 22, 2016Assignees: Tyco Electronics Japan G.K., Toyota Jidosha Kabushiki KaishaInventors: Tetsuro Akiguchi, Kazuhiko Ueda, Natsuki Nozawa, Hitoshi Ozaki, Masao Noguchi, Arata Harada
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Patent number: 9444185Abstract: A guide device that guides a component terminal includes: a guide portion configured to guide the component terminal to a specified position; and a separating mechanism portion configured to move the guide portion away from the component terminal after the guidance of the component terminal, as compared with before the guidance of the above component terminal.Type: GrantFiled: November 19, 2014Date of Patent: September 13, 2016Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Masao Noguchi, Kazuhiko Ueda, Natsuki Nozawa
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Publication number: 20160155278Abstract: The specification is related to a motor controller, a vehicle including the motor controller and a heat stress estimating method for a switching element. The motor controller includes a switching element, a temperature sensor, and a computer. The switching element is configured to convert output electric power of an electric power supply into motor-driving electric power. The temperature sensor is configured to measure a temperature of the switching element. The computer is configured to extract a maximum point and a minimum point in a time-dependent change in the temperature of the switching element, the computer is configured to calculate a temperature difference between the maximum point and the minimum point adjacent to each other and configured to calculate an estimated value of a heat stress to which the switching element is subjected based on each calculated temperature difference.Type: ApplicationFiled: November 30, 2015Publication date: June 2, 2016Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Natsuki NOZAWA, Etsushi TAGUCHI, Kento TAGURI
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Patent number: 9225280Abstract: A carrier frequency setting unit sets a carrier frequency based on a torque command and a motor rotation number of a motor generator. A PWM signal producing unit produces phase modulated waves corresponding to respective phase voltage commands, and produces respective phase PWM signals corresponding to a relationship in magnitude between the respective phase modulated waves and a carrier having the carrier frequency. A PWM center control unit produces a PWM center correction value for variably controlling the PWM center when the carrier frequency is lower than a predetermined frequency, and provides the same to the PWM signal producing unit.Type: GrantFiled: December 22, 2008Date of Patent: December 29, 2015Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Masaki Okamura, Natsuki Nozawa, Hideto Hanada
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Publication number: 20150369532Abstract: A cooler includes an estimator. The estimator is configured to estimate a coolant temperature from a measurement value of the temperature sensor. The estimator is configured to determine a difference by subtracting an immediately preceding measurement value from a current measurement value, determine a correction value from the difference, and output an estimated value of the coolant temperature. The estimated value is obtained by adding the correction value to the current measurement value. The correction value is obtained by multiplying a gain by the difference. The gain is determined from a time constant, the gain is determined according to a flow rate of the coolant. The time constant is obtained when a transfer function of heat transferred from the coolant to the temperature sensor is modeled as a first order lag system.Type: ApplicationFiled: June 11, 2015Publication date: December 24, 2015Inventors: Etsushi Taguchi, Natsuki Nozawa
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Publication number: 20150222039Abstract: An electrical connector is disclosed having a terminal housing, a female terminal, and a holding protrusion. The female terminal is positioned in the terminal housing and has a terminal body into which a complementary male terminal may be inserted and extracted. The holding protrusion projects from the terminal body in a direction orthogonal to inserting and extracting directions, and is press-fitted in the terminal receiving terminal housing.Type: ApplicationFiled: February 4, 2015Publication date: August 6, 2015Applicant: Tyco Electronics Japan G.K.Inventors: Tetsuro Akiguchi, Kazuhiko Ueda, Natsuki Nozawa, Hitoshi Ozaki, Masao Noguchi, Arata Harada
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Publication number: 20150222046Abstract: An electrical connector is disclosed having a terminal housing and a female type terminal positioned in the terminal housing. The terminal housing has a first terminal housing, and a second terminal housing positioned independent from the first terminal housing. The female type terminal has a first female terminal, second female terminal, and a coupling member. The first female terminal is positioned in the first terminal housing and is electrically connected to a first male terminal. The second female terminal is positioned in the second terminal housing and is electrically connected to a second male terminal. The coupling member connects the first female terminal to the second female terminal.Type: ApplicationFiled: February 4, 2015Publication date: August 6, 2015Applicant: TYCO ELECTRONICS JAPAN G.K.Inventors: Tetsuro Akiguchi, Kazuhiko Ueda, Natsuki Nozawa, Hitoshi Ozaki, Masao Noguchi, Arata Harada
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Publication number: 20150147903Abstract: A guide device that guides a component terminal includes: a guide portion configured to guide the component terminal to a specified position; and a separating mechanism portion configured to move the guide portion away from the component terminal after the guidance of the component terminal, as compared with before the guidance of the above component terminal.Type: ApplicationFiled: November 19, 2014Publication date: May 28, 2015Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Masao NOGUCHI, Kazuhiko UEDA, Natsuki NOZAWA
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Patent number: 8220574Abstract: An inverter control device includes a DC power supply for outputting a first DC voltage, a voltage conversion unit for converting a voltage level of the DC voltage and supplying a first DC voltage to an inverter, a temperature detection unit for detecting an ambient temperature (element temperature) of the inverter, and a control device. The control device controls the voltage conversion unit such that the voltage VH lowers as the ambient temperature is lower, based on a temperature value representing a result of detection by a temperature sensor. A tolerable surge amount can thus sufficiently be ensured at a low temperature.Type: GrantFiled: July 17, 2008Date of Patent: July 17, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventor: Natsuki Nozawa
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Patent number: 8091666Abstract: An electrically powered vehicle includes: a boost converter that boosts a power supply voltage and outputs a boosted voltage; an inverter that receives the boosted voltage from the boost converter and controls a rotating electric machine for travel; and a control device that performs control to limit the boosted voltage when it is determined that the rotating electric machine is in a locked state and both an accelerator and a brake are not operated to be on.Type: GrantFiled: November 10, 2009Date of Patent: January 10, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Natsuki Nozawa, Takashi Hamatani
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Publication number: 20100193267Abstract: An inverter control device includes a DC power supply for outputting a first DC voltage, a voltage conversion unit for converting a voltage level of the DC voltage and supplying a first DC voltage to an inverter, a temperature detection unit for detecting an ambient temperature (element temperature) of the inverter, and a control device. The control device controls the voltage conversion unit such that the voltage VH lowers as the ambient temperature is lower, based on a temperature value representing a result of detection by a temperature sensor. A tolerable surge amount can thus sufficiently be ensured at a low temperature.Type: ApplicationFiled: July 17, 2008Publication date: August 5, 2010Inventor: Natsuki Nozawa
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Publication number: 20100185350Abstract: A carrier frequency setting unit (64) sets a carrier frequency (FC) according to the torque command (TR) of a motor generator and the number of motor rotations (MRN). A PWM signal generation unit (68) generates phase modulation waves corresponding to respective phase voltage commands (Vu, Vv, Vw) and generates phase PWM signals (Pu, Pv, Pw) according to the magnitude relationship between each of the phase modulation waves and a carrier wave having the carrier frequency (FC). A PWM center control unit (66), when the carrier frequency (FC) is lower than a predetermined frequency, generates a PWM center correction value (?CE) for variably controlling a PWM center and outputs to the PWM signal generation unit (68).Type: ApplicationFiled: December 22, 2008Publication date: July 22, 2010Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Masaki Okamura, Natsuki Nozawa, Hideto Hanada
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Publication number: 20100116575Abstract: An electrically powered vehicle includes: a boost converter that boosts a power supply voltage and outputs a boosted voltage; an inverter that receives the boosted voltage from the boost converter and controls a rotating electric machine for travel; and a control device that performs control to limit the boosted voltage when it is determined that the rotating electric machine is in a locked state and both an accelerator and a brake are not operated to be on.Type: ApplicationFiled: November 10, 2009Publication date: May 13, 2010Applicant: Toyota Jidosha Kabushiki KaishaInventors: Natsuki Nozawa, Takashi Hamatani
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Publication number: 20090167079Abstract: Provided is a cost-reduced DC-DC converter for an electric automobile. This DC-DC converter is interposed between an accumulation device and a drive motor of the electric automobile for raising the electric power of the accumulation device at the power driving time of the drive motor by using a reactor, a boosting switching element and a boosting diode, and for lowering a regenerative electric power at the regenerating time of the drive motor by using the reactor, a step-down switching element and a step-down diode. The boosting switching element has a higher current allowance than that of the step-down switching element.Type: ApplicationFiled: November 29, 2006Publication date: July 2, 2009Inventors: Natsuki Nozawa, Shuichi Iwata
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Patent number: 7523797Abstract: The procedure of the invention sets a revolution speed at an efficient drive point, which is selected among drive points of an engine fulfilling a target power Pe* to be output from the engine, to a tentative revolution speed Netmp1 of the engine. The procedure also calculates a revolution speed that satisfies both a torque demand Tr* to be output to a drive shaft and a charge limit Win of a battery or an electric accumulator and sets the calculated revolution speed to a tentative revolution speed Netmp2 of the engine. The procedure sets the grater between the tentative revolution speed Netmp1 and the tentative revolution speed Netmp2 to a target revolution speed Ne* of the engine and controls the engine and two motors. This arrangement ensures output of a required braking force in response to a driver's accelerator-off action, while taking into account the charge limit of the electric accumulator.Type: GrantFiled: April 28, 2004Date of Patent: April 28, 2009Assignee: Toyota Jidosha Kabushiki KaishaInventors: Akihiro Kimura, Natsuki Nozawa
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Publication number: 20040231897Abstract: The procedure of the invention sets a revolution speed at an efficient drive point, which is selected among drive points of an engine fulfilling a target power Pe* to be output from the engine, to a tentative revolution speed Netmp1 of the engine. The procedure also calculates a revolution speed that satisfies both a torque demand Tr* to be output to a drive shaft and a charge limit Win of a battery or an electric accumulator and sets the calculated revolution speed to a tentative revolution speed Netmp2 of the engine. The procedure sets the grater between the tentative revolution speed Netmp1 and the tentative revolution speed Netmp2 to a target revolution speed Ne* of the engine and controls the engine and two motors. This arrangement ensures output of a required braking force in response to a driver's accelerator-off action, while taking into account the charge limit of the electric accumulator.Type: ApplicationFiled: April 28, 2004Publication date: November 25, 2004Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Akihiro Kimura, Natsuki Nozawa