Patents by Inventor Yasuaki Nakano

Yasuaki Nakano 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).

  • Publication number: 20190194516
    Abstract: An automotive engine coolant composition includes: a surfactant as a viscosity index improver; a rubber swelling inhibitor; and a base, in which the rubber swelling inhibitor is at least one selected from a compound expressed by a following formula (1) [in the formula, R1 is hydrogen, a methyl group, or an ethyl group] and a compound expressed by a following formula (2) [in the formula, R2 is hydrogen, a methyl group, or an ethyl group], the base includes at least one alcohol selected from the group consisting of a monohydric alcohol, a dihydric alcohol, a trihydric alcohol, and a glycol monoalkyl ether and/or water, a kinematic viscosity is 8.5 mm2/s or more at 25° C., and a content of the rubber swelling inhibitor is 0.03 parts by mass or more and 0.9 parts by mass or less with respect to 100 parts by mass of the coolant composition.
    Type: Application
    Filed: June 20, 2017
    Publication date: June 27, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yasuaki KODAMA, Kazuhito YAEDA, Yoichiro YOSHII, Yosuke KISHINO, Tomoyuki NAKANO, Masayuki NAGASAWA, Shogo KAMENOUE
  • Publication number: 20190177591
    Abstract: An automotive engine coolant composition includes: a non-silicone surfactant; an anti-foaming agent containing a mineral oil and silica; and a base, in which the base includes at least one alcohol selected from the group consisting of a monohydric alcohol, a dihydric alcohol, a trihydric alcohol, and a glycol monoalkyl ether and/or water, a kinematic viscosity is 8.5 mm2/s or more at 25° C. and 2.0 mm2/s or less at 100° C., and with respect to 100 parts by mass of the coolant composition, a content of the mineral oil is 0.01 to 0.4 parts by mass and a content of the silica is 0.003 to 0.1 parts by mass.
    Type: Application
    Filed: June 20, 2017
    Publication date: June 13, 2019
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, Shin-Etsu Chemical Co., Ltd.
    Inventors: Yasuaki KODAMA, Tomoyuki NAKANO, Takato SAKURAI, Kazuhito YAEDA, Yoichiro YOSHII, Yosuke KISHINO, Masayuki NAGASAWA, Shogo KAMENOUE
  • Patent number: 9199197
    Abstract: A fuel addition valve that adds fuel into the exhaust gas passage of the engine in the form of fine fuel droplets, an upstream NOx adsorption-reduction catalyst, and a downstream NOx adsorption-reduction catalyst are arranged in this order. Platinum Pt and palladium Pd, as noble metal, are supported on the downstream NOx adsorption-reduction NOx catalyst such that the ratio of the mole number of the platinum Pt to the sum of the mole numbers of the platinum Pt and the palladium Pd is approx. 50% to approx. 80%. Only platinum Pt is supported on the upstream NOx adsorption-reduction catalyst. According to this structure, even when liquid fuel is supplied into exhaust gas, NOx can be effectively released from the NOx adsorption-reduction catalyst, and further the amount of NOx that the NOx adsorption-reduction catalyst can adsorb at a low temperature increases.
    Type: Grant
    Filed: September 6, 2007
    Date of Patent: December 1, 2015
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kohei Yoshida, Yasuaki Nakano, Tadashi Watanabe, Kotaro Hayashi, Takamitsu Asanuma
  • Patent number: 8151554
    Abstract: An object of the present invention is to perform removal of NOx in an exhaust gas purification system for an internal combustion engine equipped with an NOx catalyst while suppressing the consumption amount of reducing agent used for NOx removal even when the NOx catalyst is deteriorated. To achieve the object, when the degree of deterioration of the NOx catalyst is lower than or equal to a specific deterioration degree, the air-fuel ratio of the exhaust gas flowing into the NOx catalyst is adjusted to the stoichiometric air-fuel ratio or a rich air-fuel ratio. On the other hand, when it is determined that the degree of deterioration of the NOx catalyst is higher than the specific deterioration degree, the air-fuel ratio of the exhaust gas flowing into the NOx catalyst is adjusted to a specific lean air-fuel ratio.
    Type: Grant
    Filed: March 20, 2006
    Date of Patent: April 10, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Yasuaki Nakano
  • Patent number: 7685812
    Abstract: A NOx storing catalyst (11) comprising a precious metal catalyst (46) and NOx absorbent (47) is arranged in an exhaust passage. When the air-fuel ratio of the exhaust gas is lean, the storing catalyst cold stores the NO2 contained in the exhaust in the absorbent when the catalyst is inactive and hot stores the cold stored NO2 in the absorbent when the catalyst is made active. The NO2 contained in the exhaust is cold stored in the absorbent when the catalyst is not activated, and when a predetermined NOx storing catalyst restoring condition (107) is met, a NOx storing catalyst restoring control (109, 115) including raising the NOx storing catalyst temperature to a predetermined temperature to active it (109) is executed so as to restore the cold storing capability of the NOx absorbent.
    Type: Grant
    Filed: October 4, 2004
    Date of Patent: March 30, 2010
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kohei Yoshida, Shinya Hirota, Takamitsu Asanuma, Yasuaki Nakano, Shunsuke Toshioka
  • Publication number: 20090280037
    Abstract: There is provided a technique which can reduce the NOx stored in an NOx storage reduction catalyst. In case where concentrated reduction is carried out so as to add a reducing agent to the NOx storage reduction catalyst in a concentrated manner when a shift has been made from a state in which reduction of the NOx stored in said NOx storage reduction catalyst is unable to be performed in spite of a request for reduction of the NOx into a state in which reduction of the NOx is able to be performed, the level of concentration upon addition of the reducing agent is changed based on the amount of the NOx stored in the NOx storage reduction catalyst and the temperature of the NOx storage reduction catalyst.
    Type: Application
    Filed: June 11, 2007
    Publication date: November 12, 2009
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Taro Aoyama, Yasuaki Nakano
  • Patent number: 7506502
    Abstract: In an exhaust gas purifying system including two NOx catalysts disposed in series with each other on an exhaust passage, oxides occluded in the NOx catalysts can be reduced appropriately. When the oxides occluded in an upstream or downstream NOx catalyst are reduced, the surrounding atmosphere of each NOx catalyst is changed between a reducing atmosphere and an oxidative atmosphere. The air-fuel ratio of exhaust gas upstream of the upstream NOx catalyst is made lower when the surrounding atmosphere of the downstream NOx catalyst is changed into a reducing atmosphere than when the surrounding atmosphere of the upstream NOx catalyst is changed into a reducing atmosphere, and the duration of the oxidative atmosphere is made longer when the surrounding atmosphere of the downstream NOx catalyst is changed into an oxidative atmosphere than when the surrounding atmosphere of the upstream NOx catalyst is changed into an oxidative atmosphere.
    Type: Grant
    Filed: September 13, 2004
    Date of Patent: March 24, 2009
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Yasuaki Nakano, Shinya Hirota
  • Publication number: 20090000277
    Abstract: A fuel addition valve that adds fuel into the exhaust gas passage of the engine in the form of fine fuel droplets, an upstream NOx adsorption-reduction catalyst, and a downstream NOx adsorption-reduction catalyst are arranged in this order. Platinum Pt and palladium Pd, as noble metal, are supported on the downstream NOx adsorption-reduction NOx catalyst such that the ratio of the mole number of the platinum Pt to the sum of the mole numbers of the platinum Pt and the palladium Pd is approx. 50% to approx. 80%. Only platinum Pt is supported on the upstream NOx adsorption-reduction catalyst. According to this structure, even when liquid fuel is supplied into exhaust gas, NOx can be effectively released from the NOx adsorption-reduction catalyst, and further the amount of NOx that the NOx adsorption-reduction catalyst can adsorb at a low temperature increases.
    Type: Application
    Filed: September 6, 2007
    Publication date: January 1, 2009
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kohei Yoshida, Yasuaki Nakano, Tadashi Watanabe, Kotaro Hayashi, Takamitsu Asanuma
  • Publication number: 20080276597
    Abstract: An object of the present invention is to perform removal of NOx in an exhaust gas purification system for an internal combustion engine equipped with an NOx catalyst while suppressing the consumption amount of reducing agent used for NOx removal even when the NOx catalyst is deteriorated. To achieve the object, when the degree of deterioration of the NOx catalyst is lower than or equal to a specific deterioration degree, the air-fuel ratio of the exhaust gas flowing into the NOx catalyst is adjusted to the stoichiometric air-fuel ratio or a rich air-fuel ratio. On the other hand, when it is determined that the degree of deterioration of the NOx catalyst is higher than the specific deterioration degree, the air-fuel ratio of the exhaust gas flowing into the NOx catalyst is adjusted to a specific lean air-fuel ratio.
    Type: Application
    Filed: March 20, 2006
    Publication date: November 13, 2008
    Inventor: Yasuaki Nakano
  • Publication number: 20070202026
    Abstract: The invention provides a technology that enables to prevent sulfur components contained in reducing agent added from flowing into an NOx catalyst thereby keeping a high NOx removing rate. An S-trapping catalyst 11 for trapping sulfur components contained in exhaust gas discharged from an internal combustion engine 1, an S-trapping catalyst 12 for trapping sulfur components contained in reducing agent added to the exhaust gas from which sulfur components have been trapped by the S-trapping catalyst 11 are provided, thereby preventing an NOx catalyst 14 from being poisoned by sulfur.
    Type: Application
    Filed: December 9, 2005
    Publication date: August 30, 2007
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kohei Yoshida, Shinya Hirota, Yasuaki Nakano
  • Patent number: 7181904
    Abstract: An SOx trap catalyst (11) able to trap SOx contained in exhaust gas is arranged in an engine exhaust passage upstream of an NOx storing catalyst (12). When the SOx trap rate by the SOx trap catalyst (11) falls, the air-fuel ratio of the exhaust gas flowing into the SOx trap catalyst (11) is maintained lean and in that state the SOx trap catalyst (11) is raised in temperature. The SOx trapped at that time diffuses inside the SOx trap catalyst (11), whereby the SOx trap rate is restored.
    Type: Grant
    Filed: October 21, 2004
    Date of Patent: February 27, 2007
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kohei Yoshida, Shinya Hirota, Yasuaki Nakano
  • Patent number: 7146800
    Abstract: An exhaust purification device, including a NOx storing catalyst comprised of a precious metal catalyst and NOx absorbent, arranged in an engine exhaust passage, which increases the ratio of the nitrogen dioxide to the nitrogen monoxide produced when burning fuel under a lean air-fuel ratio when the NOx storing catalyst is not active compared with the time when the NOx storing catalyst is active under the same engine operating conditions and stores the nitrogen dioxide contained in the exhaust gas in the NOx absorbent at that time.
    Type: Grant
    Filed: June 14, 2004
    Date of Patent: December 12, 2006
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shunsuke Toshioka, Shinya Hirota, Takamitsu Asanuma, Yasuaki Nakano, Kohei Yoshida
  • Publication number: 20060064969
    Abstract: An SOx trap catalyst (11) able to trap SOx contained in exhaust gas is arranged in an engine exhaust passage upstream of an NOx storing catalyst (12). When the SOx trap rate by the SOx trap catalyst (11) falls, the air-fuel ratio of the exhaust gas flowing into the SOx trap catalyst (11) is maintained lean and in that state the SOx trap catalyst (11) is raised in temperature. The SOx trapped at that time diffuses inside the SOx trap catalyst (11), whereby the SOx trap rate is restored.
    Type: Application
    Filed: October 21, 2004
    Publication date: March 30, 2006
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kohei Yoshida, Shinya Hirota, Yasuaki Nakano
  • Publication number: 20060037312
    Abstract: A NOx storing catalyst (11) comprising a precious metal catalyst (46) and NOx absorbent (47) is arranged in an exhaust passage. When the air-fuel ratio of the exhaust gas is lean, the storing catalyst cold stores the NO2 contained in the exhaust in the absorbent when the catalyst is inactive and hot stores the cold stored NO2 in the absorbent when the catalyst is made active. The NO2 contained in the exhaust is cold stored in the absorbent when the catalyst is not activated, and when a predetermined NOx storing catalyst restoring condition (107) is met, a NOx storing catalyst restoring control (109, 115) including raising the NOx storing catalyst temperature to a predetermined temperature to active it (109) is executed so as to restore the cold storing capability of the NOx absorbent.
    Type: Application
    Filed: October 4, 2004
    Publication date: February 23, 2006
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kohei Yoshida, Shinya Hirota, Takamitsu Asanuma, Yasuaki Nakano, Shunsuke Toshioka
  • Patent number: 6988360
    Abstract: An exhaust emission purification device comprises a sulfur component holding agent arranged on the exhaust path of an internal combustion engine for holding a sulfur component, a NOx holding agent arranged downstream of the sulfur component holding agent in the exhaust gas for holding NOx and the sulfur components when the air-fuel ratio of the exhaust gas flowing thereinto is lean, and a reducing agent adding unit for adding a reducing agent to the exhaust gas flowing into the NOx holding agent. The concentration of the sulfur component contained in the reducing agent added by the reducing agent adding unit is lower than the concentration of at least the sulfur component contained in the fuel supplied to the combustion chamber of the internal combustion engine. Thus, the sulfur poisoning of the exhaust emission purifier can be avoided while at the same time reducing the fuel consumption rate.
    Type: Grant
    Filed: July 17, 2003
    Date of Patent: January 24, 2006
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Koichi Kimura, Shinya Hirota, Yoshimitsu Henda, Kazuhiro Itoh, Takamitsu Asanuma, Shunsuke Toshioka, Yasuaki Nakano, Koichiro Nakatani, Akira Mikami
  • Publication number: 20060010854
    Abstract: An exhaust purification catalyst (11) for purifying NOx under a lean air-fuel ratio is arranged in exhaust passage of an internal combustion engine. As a catalyst carrier (50) of this exhaust purification catalyst (11), alumina, which has base points on the carrier surface, is used. The surface of the alumina is made to carry platinum (51) dispersed on it without forming a layer of a NOx absorbent able to absorb NOx. The air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst (11) is temporarily switched from lean to rich before the entire surface of the platinum (51) suffers from oxygen poisoning.
    Type: Application
    Filed: September 8, 2003
    Publication date: January 19, 2006
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yasuaki Nakano, Shinya Hirota, Toshiaki Tanaka, Akira Mikami
  • Patent number: 6955041
    Abstract: An exhaust gas purifying apparatus for an internal combustion engine, wherein the efficiency of exhaust gas purification is enhanced by optimally controlling the operating condition of a plasma generator mounted in an exhaust passage in accordance with the exhaust gas atmosphere. The exhaust gas purifying apparatus includes a detection unit for detecting exhaust water content and exhaust temperature; and a control unit for controlling at least one of two factors, frequency or voltage of an AC voltage used to operate the plasma generator mounted in the exhaust passage, in accordance with the detected exhaust water content and exhaust temperature.
    Type: Grant
    Filed: March 6, 2002
    Date of Patent: October 18, 2005
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shinichi Takeshima, Shinya Hirota, Kazuhiro Itoh, Takamitsu Asanuma, Yasuaki Nakano, Kohei Yoshida
  • Patent number: 6956008
    Abstract: A storage-reduction type NOx purifying catalyst includes a monolith substrate having formed thereon a coat layer containing a cerium-zirconium composite oxide and a cerium-free oxide, a noble metal and an NOx storing material being supported on the coat layer and the cerium content of the cerium-zirconium composite oxide being less than 30 mol % based on the total molar number of metal atoms contained.
    Type: Grant
    Filed: May 13, 2003
    Date of Patent: October 18, 2005
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shinichi Takeshima, Kohei Yoshida, Yasuaki Nakano
  • Publication number: 20050170954
    Abstract: An exhaust gas cleaning catalyst is formed of a carrier layer, and a noble metal catalyst and a SOx absorbing agent both carried on the carrier layer. The carrier layer of the exhaust gas cleaning catalyst includes at least a first distribution portion and a second distribution portion each having a different sulfate retention level. The sulfate retention level of the first distribution portion is lower than the sulfate retention level of the second distribution portion, and the noble metal catalyst is carried on the first distribution portion such that a SOx that has been oxidized on the noble metal catalyst diffuses toward the second distribution portion so as to be settled therein.
    Type: Application
    Filed: January 18, 2005
    Publication date: August 4, 2005
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kohei Yoshida, Shinya Hirota, Yasuaki Nakano
  • Patent number: 6901750
    Abstract: Exhaust emission control apparatus and method for an internal combustion engine maintain a small amount of sulfur components contained in exhaust gas flowing out of a sulfur component retainer agent even if the amount of sulfur components retained by the agent becomes great. The exhaust emission control apparatus includes a NOx retainer agent and the sulfur component retainer agent. The apparatus performs a NOx releasing process of adjusting the air-fuel ratio of exhaust gas flowing into the sulfur component retainer agent so that the air-fuel ratio of exhaust gas flowing into the NOx retainer agent becomes substantially stoichiometric or rich of stoichiometry if NOx retained by the NOx retainer agent is to be released. The apparatus prohibits the air-fuel ratio of exhaust gas flowing into the sulfur component retainer agent from becoming substantially stoichiometric or rich of stoichiometry if the amount of the sulfur components retained by the agent is at least a first predetermined amount.
    Type: Grant
    Filed: August 22, 2003
    Date of Patent: June 7, 2005
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Shunsuke Toshioka, Shinya Hirota, Yoshimitsu Henda, Kazuhiro Itoh, Takamitsu Asanuma, Koichi Kimura, Yasuaki Nakano, Koichiro Nakatani, Akira Mikami, Takanori Ueda