Patents by Inventor Tetsuya Fuchimoto
Tetsuya Fuchimoto 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: 9121911Abstract: A degradation determination device includes: a measuring unit measuring an open-circuit voltage characteristic indicating an open-circuit voltage variation with respect to a lithium ion secondary battery capacity variation; and a determining unit determining a degradation state due to wear and precipitation of lithium using a parameter for identifying the open-circuit voltage characteristic that substantially coincides with the measured open-circuit voltage characteristic.Type: GrantFiled: April 12, 2011Date of Patent: September 1, 2015Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kenji Takahashi, Yuji Nishi, Shuji Tomura, Nobuyasu Haga, Tetsuya Fuchimoto
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Publication number: 20150155604Abstract: A system for controlling precipitation and dissolution of a reaction-related substance that is a substance relating to a battery reaction in a secondary battery and that includes a first electrical storage device, a second electrical storage device and a controller. The first electrical storage device is the secondary battery. The second electrical storage device is different from the first electrical storage device. The controller is configured to control an exchange of electric power between the first electrical storage device and the second electrical storage device. The controller is configured to, when the reaction-related substance has precipitated on a negative electrode of the first electrical storage device, charge the second electrical storage device with at least part of electric power that is discharged from the first electrical storage device. Thus, the controller raises a potential of the negative electrode to a potential higher than a potential of the reaction-related substance.Type: ApplicationFiled: July 2, 2013Publication date: June 4, 2015Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Tetsuya Fuchimoto, Kenji Takahashi, Shuji Tomura, Yasuki Hirota
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Patent number: 8615372Abstract: A battery state estimating unit estimates an internal state of a secondary battery in accordance with a battery model equation in every arithmetic cycle, and estimates a charging rate and a battery current based on a result of the estimation. A parameter estimating unit obtains a battery current measured by a sensor as well as the charging rate and the battery current estimated by the battery state estimating unit. The parameter estimating unit estimates a capacity deterioration parameter such that a rate of change in difference (estimation error) between a summed value of an actual current and a summed value of an estimated current with respect to the charging rate is minimized. A result obtained by estimating the capacity deterioration parameter is reflected in the battery model by the battery state estimating unit.Type: GrantFiled: August 28, 2009Date of Patent: December 24, 2013Assignees: Kabushiki Kaisha Toyota Chuo Kenkyusho, Toyota Jidosha Kabushiki KaishaInventors: Shuji Tomura, Takaji Umeno, Yasushi Amano, Yuji Nishi, Takeshi Takemoto, Nobuyasu Haga, Tetsuya Fuchimoto
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Patent number: 8577529Abstract: A control apparatus (30) estimates a status of charge (SOC) by a first estimation method by temporarily changing the SOC of a battery (B) so that the SOC of the battery (B) falls within a first region in the case a period, during which the estimated value of the status of charge of the battery (B) falls within a second region, exceeds a prescribed period.Type: GrantFiled: June 1, 2010Date of Patent: November 5, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kenji Takahashi, Yuji Nishi, Shuji Tomura, Takeshi Takemoto, Nobuyasu Haga, Tetsuya Fuchimoto, Tetsuya Sugimoto
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Patent number: 8527225Abstract: An estimation apparatus has a controller which estimates an internal reaction of a secondary battery. The controller calculates a voltage drop amount due to an internal resistance of the secondary battery by using an expression (I): ? ? ? V = RT ? ? ? ? ? ? F ? arc ? ? sinh ( - R r ? I RT ? ? ? ? ? ? F ) - R d ? I ( I ) where ?V represents the voltage drop amount, R represents a gas constant, T represents a temperature, ? represents an oxidation reduction transfer coefficient (?=0.5) of an electrode, ? represents a correction coefficient (0<?<1), F represents the Faraday constant, I represents a discharge current, Rr represents a component of a reaction resistance included in the internal resistance, and Rd represents a component of a direct-current resistance included in the internal resistance.Type: GrantFiled: October 5, 2010Date of Patent: September 3, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kenji Takahashi, Yuji Nishi, Tetsuya Fuchimoto
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Patent number: 8498766Abstract: A hybrid vehicle (1) includes a battery (10-1), a motor-generator (32-2) operable to produce driving force using electric power of the battery (10-1), a charger (28) operable to charge the battery (10-1) by means of an external power supply, and an ECU (40). The ECU (40) stores a given parameter used in battery model expressions. The parameter varies according to the status of the battery (10-1). During running of the hybrid vehicle (1) and during charging of the battery (10-1) with the external power supply, the ECU (40) collects data related to the status of the battery (10-1), corrects the parameter based on the data, and calculates a value of charging rate (SOC) of the battery (10-1). The ECU (40) controls charge/discharge of the battery (10-1), based on the calculated SOC value.Type: GrantFiled: July 1, 2010Date of Patent: July 30, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Kenji Takahashi, Yuji Nishi, Shuji Tomura, Takeshi Takemoto, Nobuyasu Haga, Tetsuya Fuchimoto, Tetsuya Sugimoto
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Publication number: 20130099794Abstract: A degradation determination device includes: a measuring unit measuring an open-circuit voltage characteristic indicating an open-circuit voltage variation with respect to a lithium ion secondary battery capacity variation; and a determining unit determining a degradation state due to wear and precipitation of lithium using a parameter for identifying the open-circuit voltage characteristic that substantially coincides with the measured open-circuit voltage characteristic.Type: ApplicationFiled: April 12, 2011Publication date: April 25, 2013Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kenji Takahashi, Yuji Nishi, Shuji Tomura, Nobuyasu Haga, Tetsuya Fuchimoto
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Publication number: 20120221267Abstract: An estimation apparatus has a controller which estimates an internal reaction of a secondary battery. The controller calculates a voltage drop amount due to an internal resistance of the secondary battery by using an expression (I): ? ? ? V = RT ? ? ? ? ? ? F ? arc ? ? sinh ( - R r ? I RT ? ? ? ? ? ? F ) - R d ? I ( I ) where ?V represents the voltage drop amount, R represents a gas constant, T represents a temperature, ? represents an oxidation reduction transfer coefficient (?=0.5) of an electrode, ? represents a correction coefficient (0<?<1), F represents the Faraday constant, I represents a discharge current, Rr represents a component of a reaction resistance included in the internal resistance, and Rd represents a component of a direct-current resistance included in the internal resistance.Type: ApplicationFiled: October 5, 2010Publication date: August 30, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kenji Takahashi, Yuji Nishi, Tetsuya Fuchimoto
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Publication number: 20120109443Abstract: A hybrid vehicle (1) includes a battery (10-1), a motor-generator (32-2) operable to produce driving force using electric power of the battery (10-1), a charger (28) operable to charge the battery (10-1) by means of an external power supply, and an ECU (40). The ECU (40) stores a given parameter used in battery model expressions. The parameter varies according to the status of the battery (10-1). During running of the hybrid vehicle (1) and during charging of the battery (10-1) with the external power supply, the ECU (40) collects data related to the status of the battery (10-1), corrects the parameter based on the data, and calculates a value of charging rate (SOC) of the battery (10-1). The ECU (40) controls charge/discharge of the battery (10-1), based on the calculated SOC value.Type: ApplicationFiled: July 1, 2010Publication date: May 3, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Kenji Takahashi, Yuji Nishi, Shuji Tomura, Takeshi Takemoto, Nobuyasu Haga, Tetsuya Fuchimoto, Tetsuya Sugimoto
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Publication number: 20120091930Abstract: When it is determined by a determining portion (54) that the SOC of a first auxiliary power storage device (BB1) has reached a first lower limit value (TL), a switching control portion (56) generates a switching signal (SW) to switch from the first auxiliary power storage device (BB1) to the second auxiliary power storage device (BB2). A SOC estimating portion (52) measures the OCV for the first auxiliary power storage device (BB1), for which it has been determined that the SOC has reached the first lower limit value (TL) and has thus been disconnected, and estimates the SOC of that first auxiliary power storage device (BB1), based on that measured OCV. If the estimated SOC is higher than the first lower limit value (TL), after the SOC of the second auxiliary power storage device (BB2) has reached the first lower limit value (TL), the switching control portion (56) generates a switching signal (SW) to switch from the second auxiliary power storage device (BB2) to the first auxiliary storage device (BB1).Type: ApplicationFiled: June 29, 2010Publication date: April 19, 2012Inventors: Kenji Takahashi, Yuji Nishi, Shuji Tomura, Takeshi Takemoto, Nobuyasu Haga, Tetsuya Fuchimoto, Tetsuya Sugimoto
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Publication number: 20120065824Abstract: A control apparatus (30) estimates a status of charge (SOC) by a first estimation method by temporarily changing the SOC of a battery (B) so that the SOC of the battery (B) falls within a first region in the case a period, during which the estimated value of the status of charge of the battery (B) falls within a second region, exceeds a prescribed period.Type: ApplicationFiled: June 1, 2010Publication date: March 15, 2012Inventors: Kenji Takahashi, Yuji Nishi, Shuji Tomura, Takeshi Takemoto, Nobuyasu Haga, Tetsuya Fuchimoto, Tetsuya Sugimoto
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Patent number: 8108161Abstract: A battery state estimating unit estimates an internal state of a secondary battery according to a battery model equation in every arithmetic cycle, and calculates an SOC based on a result of the estimation. A parameter characteristic map stores a characteristic map based on a result of actual measurement performed in an initial state (in a new state) on a parameter diffusion coefficient and a DC resistance in the battery model equation. The parameter change rate estimating unit estimates a DC resistance change rate represented by a ratio of a present DC resistance with respect to a new-state parameter value by parameter identification based on the battery model equation, using battery data measured by sensors as well as the new-state parameter value of the DC resistance corresponding to the present battery state and read from the parameter characteristic map.Type: GrantFiled: March 13, 2008Date of Patent: January 31, 2012Assignees: Kabushiki Kaisha Toyota Chuo Kenkyusho, Toyota Jidosha Kabushiki KaishaInventors: Shuji Tomura, Takaji Umeno, Yasushi Amano, Yuji Nishi, Takeshi Takemoto, Nobuyasu Haga, Tetsuya Fuchimoto
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Patent number: 8093902Abstract: A diffusion estimation unit follows a diffusion equation in an active material that is represented by a polar coordinate to estimate a distribution in concentration of lithium in the active material. An open circuit voltage estimation unit obtains an open circuit voltage in accordance with a local SOC(?) based on a concentration of lithium obtained at an interface of the active material as estimated by the diffusion estimation unit. A current estimation unit uses a battery's voltage measured by a voltage sensor, the estimated open circuit voltage, and a parameter value that is set for the battery by a battery parameter value setting unit, and follows a voltage-current relationship model expression simplified from an electrochemical reaction expression to estimate the battery's current density.Type: GrantFiled: March 7, 2008Date of Patent: January 10, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Yuji Nishi, Takeshi Takemoto, Nobuyasu Haga, Tetsuya Fuchimoto
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Publication number: 20110161025Abstract: A battery state estimating unit estimates an internal state of a secondary battery in accordance with a battery model equation in every arithmetic cycle, and estimates a charging rate and a battery current based on a result of the estimation. A parameter estimating unit obtains a battery current measured by a sensor as well as the charging rate and the battery current estimated by the battery state estimating unit. The parameter estimating unit estimates a capacity deterioration parameter such that a rate of change in difference (estimation error) between a summed value of an actual current and a summed value of an estimated current with respect to the charging rate is minimized. A result obtained by estimating the capacity deterioration parameter is reflected in the battery model by the battery state estimating unit.Type: ApplicationFiled: August 28, 2009Publication date: June 30, 2011Applicants: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shuji Tomura, Takaji Umeno, Yasushi Amano, Yuji Nishi, Takeshi Takemoto, Nobuyasu Haga, Tetsuya Fuchimoto
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Publication number: 20100153038Abstract: A battery state estimating unit (110) estimates an internal state of a secondary battery according to a battery model equation in every arithmetic cycle, and calculates an SOC based on a result of the estimation. A parameter characteristic map (120) stores a characteristic map based on a result of actual measurement performed in an initial state (in a new state) on a parameter diffusion coefficient (Ds) and a DC resistance (Ra) in the battery model equation. The parameter change rate estimating unit (130) estimates a DC resistance change rate (gr) represented by a ratio of a present DC resistance (Rc) with respect to a new-state parameter value (Ran) by parameter identification based on the battery model equation, using battery data (Tb, Vb and Ib) measured by sensors as well as the new-state parameter value (Ran) of the DC resistance corresponding to the p resent battery state and read from the parameter characteristic map (120).Type: ApplicationFiled: March 13, 2008Publication date: June 17, 2010Applicants: Kabushiki Kaisha Toyota-Chuo Kenkyusho, Toyota Jidosha Kabushiki Kaisha 1, Toyota-shiInventors: Shuji Tomura, Takaji Umeno, Yasushi Amano, Yuji Nishi, Takeshi Takemoto, Nobuyasu Haga, Tetsuya Fuchimoto
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Publication number: 20100085057Abstract: A diffusion estimation unit follows a diffusion equation in an active material that is represented by a polar coordinate to estimate a distribution in concentration of lithium in the active material. An open circuit voltage estimation unit obtains an open circuit voltage in accordance with a local SOC(?) based on a concentration of lithium obtained at an interface of the active material as estimated by the diffusion estimation unit. A current estimation unit uses a battery's voltage measured by a voltage sensor, the estimated open circuit voltage, and a parameter value that is set for the battery by a battery parameter value setting unit, and follows a voltage-current relationship model expression simplified from an electrochemical reaction expression to estimate the battery's current density.Type: ApplicationFiled: March 7, 2008Publication date: April 8, 2010Inventors: Yuji Nishi, Takeshi Takemoto, Nobuyasu Haga, Tetsuya Fuchimoto