Patents by Inventor Takeho Aisaka
Takeho Aisaka 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: 11476482Abstract: Provided is a fuel cell system capable of suppressing the movement of an operating point of a compressor between a surge region and a non-surge region to reduce operation sounds and vibrations, the fuel cell system including at least: a fuel cell; a compressor; a dry state estimation part to estimate a dry state of the fuel cell; and a pressure target control part to control a pressure target, wherein the pressure target control part is capable of executing at least rise control and lower control, the rise control and the lower control being such that an operating point of the compressor is positioned outside a surge region, a current pressure target is corrected to the value same as a last pressure target if the current pressure target is lower (higher) than the last pressure target when the rise control (lower control) is being carried out.Type: GrantFiled: April 9, 2021Date of Patent: October 18, 2022Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shuya Kawahara, Hiroyuki Imanishi, Takeho Aisaka
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Patent number: 11456469Abstract: A fuel cell system including a fuel cell, an air compressor that supplies oxidant gas to the fuel cell, an upstream supply pipe provided with the air compressor, a downstream supply pipe connected to the upstream supply pipe and the fuel cell, an upstream discharge pipe connected to the fuel cell, a downstream discharge pipe connected to the upstream discharge pipe, a bypass pipe, a valve mechanism configured to be switchable between a supply state and a bypass state, and a controller configured to control the air compressor, the valve mechanism, and a power generation state of the fuel cell.Type: GrantFiled: March 26, 2021Date of Patent: September 27, 2022Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shun Matsumoto, Yoshikatsu Fujimura, Shigeki Hasegawa, Shuya Kawahara, Takeho Aisaka, Hiroyuki Imanishi
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Publication number: 20210376356Abstract: Provided is a fuel cell system capable of suppressing the movement of an operating point of a compressor between a surge region and a non-surge region to reduce operation sounds and vibrations, the fuel cell system including at least: a fuel cell; a compressor; a dry state estimation part to estimate a dry state of the fuel cell; and a pressure target control part to control a pressure target, wherein the pressure target control part is capable of executing at least rise control and lower control, the rise control and the lower control being such that an operating point of the compressor is positioned outside a surge region, a current pressure target is corrected to the value same as a last pressure target if the current pressure target is lower (higher) than the last pressure target when the rise control (lower control) is being carried out.Type: ApplicationFiled: April 9, 2021Publication date: December 2, 2021Inventors: Shuya KAWAHARA, Hiroyuki IMANISHI, Takeho AISAKA
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Publication number: 20210376355Abstract: A fuel cell system including a fuel cell, an air compressor that supplies oxidant gas to the fuel cell, an upstream supply pipe provided with the air compressor, a downstream supply pipe connected to the upstream supply pipe and the fuel cell, an upstream discharge pipe connected to the fuel cell, a downstream discharge pipe connected to the upstream discharge pipe, a bypass pipe, a valve mechanism configured to be switchable between a supply state and a bypass state, and a controller configured to control the air compressor, the valve mechanism, and a power generation state of the fuel cell.Type: ApplicationFiled: March 26, 2021Publication date: December 2, 2021Inventors: Shun MATSUMOTO, Yoshikatsu FUJIMURA, Shigeki HASEGAWA, Shuya KAWAHARA, Takeho AISAKA, Hiroyuki IMANISHI
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Patent number: 8826642Abstract: An electronic control device calculates the maximum actual oxygen storage capacity of a catalyst. The gradient of a linear expression formed between the catalyst temperature and the maximum oxygen storage capacity of the catalyst is stored for each degradation level of the catalyst. The gradient can be learned in accordance with the same temperature of the catalyst and the maximum actual oxygen storage capacity. When the maximum actual oxygen storage capacity is calculated, it is revised in accordance with the temperature of the catalyst, a reference temperature, the linear expression, and the learned gradient. The revised maximum oxygen storage capacity which is the maximum oxygen storage capacity when the temperature of the catalyst during the same calculation period is equal to the reference temperature is then calculated. If a response delay is detected in the output of an oxygen sensor, the gradient of the learned linear expression is discarded.Type: GrantFiled: April 13, 2010Date of Patent: September 9, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takeho Aisaka, Takashi Nakamura, Takuya Matsumoto, Makoto Sato, Hiroshi Sawada, Yasushi Iwazaki, Yusuke Kawamura
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Patent number: 8522531Abstract: A determination oxygen storage amount used to determine whether a catalyst is degraded is a value obtained by applying a correction amount for removing error caused by response delay time of an output signal of an oxygen sensor to an oxygen storage amount calculated every short time. The correction amount is a value that is calculated using slopes stored in memory, i.e., the slopes for the number of storage cycles (>the short time) corresponding to the response delay time, or the like, and becomes more accurate as a value corresponding to the error as the storage cycle becomes relatively shorter with respect to the response delay time and the number of the slopes stored in the memory increases. The necessary storage capacity of the memory is inhibited from increasing excessively even if the number of the slopes stored in the memory is large.Type: GrantFiled: August 3, 2011Date of Patent: September 3, 2013Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takuya Matsumoto, Takashi Nakamura, Takeho Aisaka
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Publication number: 20130199161Abstract: An electronic control device calculates the maximum actual oxygen storage capacity of a catalyst. The gradient of a linear expression formed between the catalyst temperature and the maximum oxygen storage capacity of the catalyst is stored for each degradation level of the catalyst. The gradient can be learned in accordance with the same temperature of the catalyst and the maximum actual oxygen storage capacity. When the maximum actual oxygen storage capacity is calculated, it is revised in accordance with the temperature of the catalyst, a reference temperature, the linear expression, and the learned gradient. The revised maximum oxygen storage capacity which is the maximum oxygen storage capacity when the temperature of the catalyst during the same calculation period is equal to the reference temperature is then calculated. If a response delay is detected in the output of an oxygen sensor, the gradient of the learned linear expression is discarded.Type: ApplicationFiled: April 13, 2010Publication date: August 8, 2013Inventors: Takeho Aisaka, Takashi Nakamura, Takuya Matsumoto, Makoto Sato, Hiroshi Sawada, Yasushi Iwazaki, Yusuke Kawamura
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Publication number: 20120078535Abstract: An abnormality determination apparatus includes: a detecting unit repeatedly detecting a state quantity, which correlates with an operating state of an evaluation target device, at time intervals; and a determining unit determining whether there is an abnormality on the basis of multiple pieces of data about the state quantity, detected by the detecting unit and stored. The apparatus counts the number of the stored data as a total storage number after there occurs a situation that no data are stored, permits the determining unit to execute abnormality determination on the condition that the total storage number has reached a first threshold in a first trip after the situation occurs, and permits the determining unit to execute abnormality determination on the condition that the total storage number has reached a second threshold that is smaller than the first threshold in a second trip or later after the situation occurs.Type: ApplicationFiled: September 23, 2011Publication date: March 29, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takashi Nakamura, Takeho Aisaka
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Publication number: 20120031170Abstract: A determination oxygen storage amount used to determine whether a catalyst is degraded is a value obtained by applying a correction amount for removing error caused by response delay time of an output signal of an oxygen sensor to an oxygen storage amount calculated every short time. The correction amount is a value that is calculated using slopes stored in memory, i.e., the slopes for the number of storage cycles (>the short time) corresponding to the response delay time, or the like, and becomes more accurate as a value corresponding to the error as the storage cycle becomes relatively shorter with respect to the response delay time and the number of the slopes stored in the memory increases. The necessary storage capacity of the memory is inhibited from increasing excessively even if the number of the slopes stored in the memory is large.Type: ApplicationFiled: August 3, 2011Publication date: February 9, 2012Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takuya Matsumoto, Takashi Nakamura, Takeho Aisaka