Patents by Inventor Kazuhiro Umemoto

Kazuhiro Umemoto 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: 20170248060
    Abstract: A particulate filter for trapping the particulate matter which is contained in the exhaust gas is provided inside an engine exhaust passage. Additional fuel is secondarily injected from a fuel injector in an engine expansion stroke or exhaust stroke or hydrocarbons are secondarily added from an addition valve which is provided upstream of the particulate filter in the exhaust pipe. An amount of hydrocarbons which come from the fuel injector or addition valve and then adhere in the form of a liquid to the inflow end of the particulate filter, and an amount of particulate matter which reaches the inflow end of the particulate filter are respectively estimated. A degree of clogging at the inflow end of the particulate filter is estimated based on the amount of hydrocarbons and the amount of particulate matter.
    Type: Application
    Filed: July 2, 2015
    Publication date: August 31, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuhiro UMEMOTO, Kohei YOSHIDA
  • Patent number: 9719394
    Abstract: In an engine exhaust passage, in order from an exhaust upstream side, an NOx storage and reduction catalyst, NO oxidation catalyst, NO2 reduction catalyst, and selective reduction catalyst may be arranged. An air-fuel ratio of an exhaust gas which flows into the NOx storage and reduction catalyst may be temporarily switched to a rich air-fuel ratio which may be adapted for generating ammonia from NOx which may be stored in the NOx storage and reduction catalyst. The ammonia, which may be generated by the NOx storage and reduction catalyst, may be held at the selective reduction catalyst. The NOx which flows into the selective reduction catalyst may be reduced by the ammonia. The NO oxidation catalyst and NO2 reduction catalyst may be used to make an NO ratio of the exhaust gas which flows into the selective reduction catalyst approach an optimum ratio of the selective reduction catalyst.
    Type: Grant
    Filed: March 10, 2016
    Date of Patent: August 1, 2017
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazuhiro Umemoto, Toshihiro Mori, Hiroshi Kobayashi, Shigeki Nakayama
  • Publication number: 20170211442
    Abstract: An exhaust emission control apparatus for an engine includes an ECU. The ECU is configured to: execute particulate matter removal control by controlling the engine such that a temperature of a particulate filter is increased to a predetermined PM removal temperature in order to reduce an amount of particulate matter collected in the particulate filter; and when the ECU determines that the amount of particulate matter collected in the particulate filter is smaller than or equal to a predetermined set collection amount, execute ash desorption control by controlling the engine such that the temperature of the particulate filter is increased to a predetermined ash desorption temperature and is kept at the ash desorption temperature or higher in order to reduce an amount of ash deposited in the particulate filter. The ash desorption temperature is a temperature suitable for converting the ash into calcium oxide.
    Type: Application
    Filed: January 13, 2017
    Publication date: July 27, 2017
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuhiro UMEMOTO, Toshihiro MORI
  • Publication number: 20160333808
    Abstract: A control apparatus for an internal combustion engine having an exhaust gas purification device which is arranged in an exhaust passage and includes a NOx storage reduction (NSR) catalyst. The control apparatus, when the air fuel ratio of the air-fuel mixture is shifted from a lean air fuel ratio to the stoichiometric air fuel ratio, determines a predetermined NOx amount so as to be larger when the temperature detected by the first detection unit is high in comparison with when the detected temperature is low, and when the storage amount of NOx in the NSR catalyst is larger than the predetermined NOx amount, performs the rich spike processing and then controls the air fuel ratio to the stoichiometric air fuel ratio, whereas when otherwise, controls the air fuel ratio to the stoichiometric air fuel ratio without performing the rich spike processing.
    Type: Application
    Filed: May 10, 2016
    Publication date: November 17, 2016
    Inventors: Hiroshi Kobayashi, Kazuhiro Umemoto, Toshihiro Mori, Shigeki Nakayama
  • Publication number: 20160326930
    Abstract: In an engine exhaust passage, in order from an exhaust upstream side, an NOx storage and reduction catalyst, NO oxidation catalyst, NO2 reduction catalyst, and selective reduction catalyst may be arranged. An air-fuel ratio of an exhaust gas which flows into the NOx storage and reduction catalyst may be temporarily switched to a rich air-fuel ratio which may be adapted for generating ammonia from NOx which may be stored in the NOx storage and reduction catalyst. The ammonia, which may be generated by the NOx storage and reduction catalyst, may be held at the selective reduction catalyst. The NOx which flows into the selective reduction catalyst may be reduced by the ammonia. The NO oxidation catalyst and NO2 reduction catalyst may be used to make an NO ratio of the exhaust gas which flows into the selective reduction catalyst approach an optimum ratio of the selective reduction catalyst.
    Type: Application
    Filed: March 10, 2016
    Publication date: November 10, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuhiro UMEMOTO, Toshihiro MORI, Hiroshi KOBAYASHI, Shigeki NAKAYAMA
  • Publication number: 20160281573
    Abstract: An internal combustion engine is provided with a hydrocarbon feed valve arranged in an engine exhaust passage. When injection control for injecting hydrocarbons from the hydrocarbon feed valve for exhaust treatment is stopped, to prevent the hydrocarbon feed valve from clogging, hydrocarbons for preventing clogging are injected from the hydrocarbon feed valve when the engine is not discharging soot, that is, when the feed of fuel to the inside of the combustion chamber is stopped and, after hydrocarbons for preventing clogging are injected once, the injection of hydrocarbons for preventing clogging from the hydrocarbon feed valve is stopped until injection control for exhaust treatment is started.
    Type: Application
    Filed: August 14, 2014
    Publication date: September 29, 2016
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuhiro UMEMOTO, Kohei YOSHIDA, Yuki BISAIJI
  • Patent number: 9238200
    Abstract: A method for purifying exhaust gas of an internal combustion engine including flowing an exhaust gas containing NOx and a concentration of hydrocarbons in an exhaust gas passage that contains an exhaust purification catalyst, wherein the concentration of hydrocarbons is vibrated within a predetermined range of amplitude and period, and a least a portion of the hydrocarbons are reformed by the exhaust purification catalyst; reacting the NOx contained in the exhaust gas and the reformed hydrocarbons to produce a reducing intermediate; and chemically reducing, wherein at the time of engine operation, a demanded produced amount of the reducing intermediate required for chemically reducing the NOx is calculated, and the amplitude and vibration period of the concentration of hydrocarbons flowing into the exhaust purification catalyst are controlled so that an amount of the reducing intermediate produced becomes the demanded produced amount.
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: January 19, 2016
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazuhiro Umemoto, Kohei Yoshida, Mikio Inoue, Yuki Bisaiji
  • Patent number: 9181842
    Abstract: A temperature sensor includes temperature detecting means and at least one of a catalyst and an adsorbent applied to the surface of the temperature detecting means. At least one of the catalyst and the adsorbent catalyzes an exothermic reaction of a reactant in gas on the temperature detecting means. A temperature that is increased by the exothermic reaction is detected by the temperature detecting means. The catalytic efficiency for the exothermic reaction of at least one of the catalyst and the adsorbent is reduced by sulfur poisoning. The temperature sensor is disposed upstream of an exhaust purification system. Accordingly, it is determined that the temperature sensor is subjected to sulfur poisoning if the temperature detected by the temperature sensor is below a prescribed temperature.
    Type: Grant
    Filed: January 8, 2010
    Date of Patent: November 10, 2015
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuhiro Umemoto, Hiromasa Nishioka, Yoshihisa Tsukamoto, Junichi Matsuo, Takamitsu Asanuma, Takao Fukuma, Kouhei Yoshida, Daichi Imai, Yuka Nakata
  • Patent number: 9175590
    Abstract: An exhaust purification system of an internal combustion engine provided with an exhaust purification catalyst which reacts NOX and hydrocarbons. The exhaust purification catalyst includes an upstream side catalyst and a downstream side catalyst. The upstream side catalyst has an oxidation ability, while the downstream side catalyst carries precious metal catalyst particles on the exhaust flow surface and is formed with basic exhaust flow surface parts. The exhaust purification catalyst can make the concentration of hydrocarbons vibrate by within a predetermined range of amplitude and by within a predetermined range of period so as to partially oxidize the hydrocarbons or produce reducing intermediates at the upstream side catalyst. When the temperature of the upstream side catalyst is less than a first judgment temperature and the temperature of the downstream side catalyst is higher than a second judgment temperature, the temperature of the upstream side catalyst is made to rise.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: November 3, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazuhiro Umemoto, Kohei Yoshida, Mikio Inoue
  • Patent number: 9108154
    Abstract: In an internal combustion engine, inside of an engine exhaust passage, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged. At the time of engine operation, the amplitude of change of the concentration of hydrocarbons which flow into the exhaust purification catalyst (13) is made to become within a predetermined range of amplitude by control of at least one of the injection time and injection pressure of hydrocarbons from the hydrocarbon feed valve (15). In this case, when only the injection time of hydrocarbons is controlled, the injection time of hydrocarbons under the same engine operating state is made longer the higher the temperature of the exhaust purification catalyst (13).
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: August 18, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Mikio Inoue, Kohei Yoshida, Yuki Bisaiji, Kazuhiro Umemoto
  • Patent number: 9109492
    Abstract: An exhaust purification system of an internal combustion engine including an ammonia oxidation catalyst device and an ammonia holding device arranged immediately upstream of the ammonia oxidation catalyst device is provided. The ammonia holding device has a solid acid, holds ammonia to restrain the ammonia from flowing into the ammonia oxidation catalyst device when a temperature of the ammonia oxidation catalyst device is within a N2O producing temperature range, and releases the held ammonia to make the ammonia flow into the ammonia oxidation catalyst device when the temperature of the ammonia oxidation catalyst device is out of the N2O producing temperature range.
    Type: Grant
    Filed: June 16, 2009
    Date of Patent: August 18, 2015
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takamitsu Asanuma, Kazuhiro Umemoto
  • Patent number: 9097157
    Abstract: An exhaust purification system of an internal combustion engine is provided with an exhaust purification catalyst which includes an upstream side catalyst and a downstream side catalyst and removes NOX. The upstream side catalyst has an oxidation ability, while the downstream side catalyst has catalyst particles of precious metals and basic exhaust flow surface parts. The system makes the concentration of hydrocarbons which flow into the exhaust purification catalyst vibrate by within a predetermined range of amplitude and by within a predetermined range of period and reduces the NOX. The upstream side catalyst includes an upstream side substrate and an upstream side container, while the downstream side catalyst includes a downstream side substrate, a downstream side container, and a channel of exhaust between the downstream side substrate and the downstream side container.
    Type: Grant
    Filed: November 9, 2011
    Date of Patent: August 4, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazuhiro Umemoto, Mikio Inoue
  • Patent number: 9051860
    Abstract: In an internal combustion engine, inside of an engine exhaust passage, a hydrocarbon feed valve (16), an exhaust purification catalyst (13), an aqueous urea solution feed valve (17), and an NOx selective reduction catalyst (15) are arranged in that order. A first NOx purification method which makes the concentration of hydrocarbons flowing into the exhaust purification catalyst (13) vibrate by within predetermined ranges of amplitude and period to reduce the NOx contained in exhaust gas in the exhaust purification catalyst (13) is normally used. A second NOx purification method which uses the fed aqueous urea solution to reduce the NOx in the NOx selective reduction catalyst (15) is used when the fed hydrocarbons exceed the allowable value.
    Type: Grant
    Filed: May 20, 2010
    Date of Patent: June 9, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Mikio Inoue, Kohei Yoshida, Yuki Bisaiji, Kazuhiro Umemoto
  • Patent number: 9038372
    Abstract: In an internal combustion engine, inside an engine exhaust passage, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged. The carrier (50) of the exhaust purification catalyst (13) is formed from a crystallized composite oxide of aluminum and an alkali earth metal. On this carrier (50), precious metal catalysts (51, 52) are carried. The concentration of hydrocarbons which flow into the exhaust purification catalyst (13) is made to vibrate by within a predetermined range of amplitude of a 200 ppm or more and within a predetermined range of period of 5 second or less, whereby the NOx which is contained in exhaust gas is reduced at the exhaust purification catalyst (13).
    Type: Grant
    Filed: October 4, 2010
    Date of Patent: May 26, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masao Watanabe, Koutarou Hayashi, Kohei Yoshida, Yuki Bisaiji, Kazuhiro Umemoto
  • Patent number: 9034267
    Abstract: In an internal combustion engine, inside of an engine exhaust passage, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged. The exhaust purification catalyst (13) is comprised of a mixture of a first catalyst in which platinum (51) and a basic layer (52) are carried on alumina (50) and a second catalyst in which rhodium (56) is carried on zirconia (55). The concentration of hydrocarbons which flow into the exhaust purification catalyst (13) is made to vibrate by within a predetermined range of amplitude of a 200 ppm or more and within a predetermined range of period of 5 second or less, whereby the NOx which is contained in exhaust gas is reduced at the exhaust purification catalyst (13).
    Type: Grant
    Filed: October 4, 2010
    Date of Patent: May 19, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masao Watanabe, Koutarou Hayashi, Kohei Yoshida, Yuki Bisaiji, Kazuhiro Umemoto
  • Patent number: 9028763
    Abstract: An exhaust purification system of an internal combustion engine is provided with an exhaust purification catalyst which includes an upstream side catalyst and a downstream side catalyst and which makes NOX and hydrocarbons react. The upstream side catalyst has an oxidation ability, while the downstream side catalyst carries precious metal catalyst particles on an exhaust flow surface and is formed with basic exhaust flow surface parts. The exhaust purification catalyst makes the concentration of hydrocarbons vibrate by within a predetermined range of amplitude and by within a predetermined range of period so as to remove the NOX. The upstream side catalyst has a high efficiency temperature at which hydrocarbons can be partially oxidized by a predetermined efficiency.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: May 12, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazuhiro Umemoto, Kohei Yoshida, Mikio Inoue
  • Patent number: 9028761
    Abstract: In an internal combustion engine, inside of an engine exhaust passage, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged. The exhaust purification catalyst (13) is comprised of an upstream-side catalyst (14a) and a downstream-side catalyst (14b) arranged in series at an interval from each other. The upstream-side catalyst (14b) has a smaller cross-sectional area than the downstream-side catalyst (14b). The concentration of hydrocarbons which flow into the upstream-side catalyst (14a) is made to vibrate by within a predetermined range of amplitude of a 200 ppm or more and within a predetermined range of period of 5 seconds or less, whereby the NOx which is contained in exhaust gas is reduced at the exhaust purification catalyst (13).
    Type: Grant
    Filed: December 24, 2010
    Date of Patent: May 12, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazuhiro Umemoto, Kohei Yoshida, Mikio Inoue
  • Patent number: 9021788
    Abstract: In an internal combustion engine, inside of an engine exhaust passage, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged. At the time of engine operation, the amplitude of change of the concentration of hydrocarbons which flow into the exhaust purification catalyst (13) is made to become within a predetermined range of amplitude by control of the injection amount of hydrocarbons from the hydrocarbon feed valve (15), the concentration of hydrocarbons flowing into the exhaust purification catalyst (13) is made to vibrate by a predetermined range of period by control of the injection period of hydrocarbons from the hydrocarbon feed valve (15), and thereby the NOx contained in the exhaust gas and the NOx stored in the exhaust purification catalyst (13) are reduced.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: May 5, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Mikio Inoue, Kohei Yoshida, Yuki Bisaiji, Kazuhiro Umemoto
  • Patent number: 9010090
    Abstract: In an internal combustion engine, inside of an engine exhaust passage, a hydrocarbon feed valve (15) and an exhaust purification catalyst (13) are arranged. The concentration of hydrocarbons which flow into the exhaust purification catalyst (13) is made to vibrate within 200 ppm or more predetermined amplitude and within a 5 second or more predetermined period. At this time, when a predetermined amount or more of NOx is stored in the exhaust purification catalyst (13) or can be stored, the concentration of hydrocarbons flowing into the exhaust purification catalyst (13) is temporarily increased to desorb NOx which is stored at the exhaust purification catalyst (13).
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: April 21, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Yuki Bisaiji, Kohei Yoshida, Mikio Inoue, Kazuhiro Umemoto
  • Patent number: 9010097
    Abstract: In an internal combustion engine, inside of an engine exhaust passage, a hydrocarbon feed valve (16), an exhaust purification catalyst (13), a particulate filter (14), and an NO2 reduction catalyst (15) are arranged. At the time of engine operation, the amplitude of change of the concentration of hydrocarbons which flow into the exhaust purification catalyst (13) is made to become within a predetermined range of amplitude by control of the injection amount of hydrocarbons from the hydrocarbon feed valve (16). When the NO2 which is produced at the particulate filter (14) should be reduced to NO, the injection amount of hydrocarbons is increased whereby the pass through amount of hydrocarbons which pass straight through the exhaust purification catalyst (13) is increased.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: April 21, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Mikio Inoue, Kohei Yoshida, Yuki Bisaiji, Kazuhiro Umemoto, Masahide Iida