Patents by Inventor Hisashi Ohki
Hisashi Ohki 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: 10605366Abstract: A pressure ring includes a first pressure ring fitted in a first ring groove of a piston; and a second pressure ring fitted in a second ring groove of the piston, and positioned between the first pressure ring and an oil ring. The second pressure ring is provided with a groove that extends across a surface of the second pressure ring from an inner peripheral side to an outer peripheral side. The groove is configured such that at least one of a width and a depth of the groove becomes larger toward the outer peripheral side from the inner peripheral side.Type: GrantFiled: April 11, 2018Date of Patent: March 31, 2020Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hisashi Ohki, Takashi Koyama, Hiroshi Yaguchi, Yusuke Morita, Takashi Suzuki
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Publication number: 20180299011Abstract: A pressure ring includes a first pressure ring fitted in a first ring groove of a piston; and a second pressure ring fitted in a second ring groove of the piston, and positioned between the first pressure ring and an oil ring. The second pressure ring is provided with a groove that extends across a surface of the second pressure ring from an inner peripheral side to an outer peripheral side. The groove is configured such that at least one of a width and a depth of the groove becomes larger toward the outer peripheral side from the inner peripheral side.Type: ApplicationFiled: April 11, 2018Publication date: October 18, 2018Applicant: Toyota Jidosha Kabushiki KaishaInventors: Hisashi Ohki, Takashi Koyama, Hiroshi Yaguchi, Yusuke Morita, Takashi Suzuki
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Publication number: 20170314502Abstract: An internal combustion engine has a cylinder block and a cylinder head fixed to each other with a plurality of bolts, and a piston fitted in a cylinder bore of the cylinder block so as to be able to reciprocate. A portion of the cylinder bore having a minimum diameter in a travel range of a skirt across which the skirt travels as the piston reciprocates is located within a range facing the skirt when the piston is at a bottom dead center. A clearance between the skirt and the minimum-diameter portion has a minimum value of a clearance between the skirt and a wall surface of the cylinder bore.Type: ApplicationFiled: April 26, 2017Publication date: November 2, 2017Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takashi SUZUKI, Hiroshi YAGUCHI, Hisashi OHKI
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Patent number: 9488135Abstract: A flow rate controller of an internal combustion engine includes a flow rate change section configured by including an EGR valve, a bypass valve, and a diesel throttle, as the flow rate change section capable of changing at least one of a flow rate of exhaust gas that is recirculated to an intake system from an exhaust system of an internal combustion engine via an EGR passage and a flow rate of fresh air that flows into the internal combustion engine. In addition, an ECU is included to realize: an arrival position determining section for determining an arrival position of condensed water in the EGR passage that is moved by the EGR at least either at the time of acceleration or at the time of deceleration of the internal combustion engine; and a control section for controlling the flow rate change section on the basis of the arrival position determined by the arrival position determining section.Type: GrantFiled: April 12, 2012Date of Patent: November 8, 2016Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Akira Yamashita, Kazuhiro Mori, Koichiro Nakatani, Hisashi Ohki
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Publication number: 20150027421Abstract: A flow rate controller of an internal combustion engine includes a flow rate change section configured by including an EGR valve, a bypass valve, and a diesel throttle, as the flow rate change section capable of changing at least one of a flow rate of exhaust gas that is recirculated to an intake system from an exhaust system of an internal combustion engine via an EGR passage and a flow rate of fresh air that flows into the internal combustion engine. In addition, an ECU is included to realize: an arrival position determining section for determining an arrival position of condensed water in the EGR passage that is moved by the EGR at least either at the time of acceleration or at the time of deceleration of the internal combustion engine; and a control section for controlling the flow rate change section on the basis of the arrival position determined by the arrival position determining section.Type: ApplicationFiled: April 12, 2012Publication date: January 29, 2015Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Akira Yamashita, Kazuhiro Mori, Koichiro Nakatani, Hisashi Ohki
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Patent number: 8332129Abstract: An internal combustion engine exhaust gas system includes a filter arranged in an exhaust passage of the internal combustion engine, a fuel adding valve which is arranged upstream of the filter and supplies fuel into the exhaust passage, and a low-pressure exhaust gas recirculation apparatus that removes some of the exhaust gas from downstream of the filter as EGR gas. An EGR rate is controlled taking into account the amount of fuel supplied by the fuel adding valve such that an oxygen concentration of intake gas, which is drawn into a cylinder of the internal combustion engine in a state in which the EGR gas that is introduced by the low-pressure exhaust gas recirculation apparatus is mixed with air introduced into an intake passage, is constant before and after fuel is supplied by the fuel adding valve.Type: GrantFiled: February 19, 2008Date of Patent: December 11, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takafumi Yamada, Hisashi Ohki
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Patent number: 8261755Abstract: An object of the present invention is to control the discharge amount of unburned fuel components in the internal combustion engine. According the present invention, the number of times of execution of sub fuel injection is changed based on the operation range within which the operation state of the internal combustion engine falls so that the lower the engine load of the internal combustion engine is, and the lower the number of engine revolutions of the internal combustion engine is, the more the number of times of execution of sub fuel injection is increased. Furthermore, the lower the atmospheric pressure is, the lower the temperature of the cooling water of the internal combustion engine is, or the lower the temperature of the intake air of the internal combustion engine is, the more an operation range in which the number of times of execution of sub fuel injection is large is expanded to higher loads and higher revolutions.Type: GrantFiled: April 28, 2008Date of Patent: September 11, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takashi Koyama, Hisashi Ohki, Masahiro Nagae, Kiyoshi Fujiwara, Tomohiro Kaneko, Takafumi Yamada, Hajime Shimizu, Seiji Ogura
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Patent number: 8131449Abstract: A fuel injection valve coupled to a common rail is provided. When fuel injection is carried out, the fuel pressure in the fuel injection valve pulsates. An interval between a pilot injection and a main injection is set so that the main injection is carried out at a zero gradient timing as a timing when the gradient of the fuel pressure in the fuel injection valve after the pilot injection is approximately equal to zero. Owing to a fuel injection control apparatus and a fuel injection control method for an internal combustion engine that perform the above-mentioned control, the fuel injection amount for the subsequent fuel injection following the preceding fuel injection can be reliably held equal to a normal amount.Type: GrantFiled: July 18, 2008Date of Patent: March 6, 2012Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takashi Koyama, Hisashi Ohki, Kiyoshi Fujiwara, Tomohiro Kaneko, Takahumi Yamada
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Patent number: 7861686Abstract: According to an internal combustion engine fuel injection control apparatus and control method, when an operating region of the engine shifts from a fuel cut region in which no fuel is injected to a low load region in which a small amount of fuel is injected, or visa versa, at least one pilot injection is executed ahead of a main injection in the low load region, and the number of pilot injections is determined according to the engine coolant temperature. This injection control makes it possible to ensure drivability while suppressing the amount of HC produced.Type: GrantFiled: June 11, 2008Date of Patent: January 4, 2011Assignee: Toyota Jidosha Kabushiki KaishaInventors: Seiji Ogura, Hisashi Ohki, Takashi Koyama
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Publication number: 20100211293Abstract: An internal combustion engine exhaust gas system includes a filter arranged in an exhaust passage of the internal combustion engine, a fuel adding valve which is arranged upstream of the filter and supplies fuel into the exhaust passage, and a low-pressure exhaust gas recirculation apparatus that removes some of the exhaust gas from downstream of the filter as EGR gas. An EGR rate is controlled taking into account the amount of fuel supplied by the fuel adding valve such that an oxygen concentration of intake gas, which is drawn into a cylinder of the internal combustion engine in a state in which the EGR gas that is introduced by the low-pressure exhaust gas recirculation apparatus is mixed with air introduced into an intake passage, is constant before and after fuel is supplied by the fuel adding valve.Type: ApplicationFiled: February 19, 2008Publication date: August 19, 2010Applicant: Toyota Jidosha Kabushiki KaishaInventors: Takafumi Yamada, Hisashi Ohki
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Publication number: 20100116243Abstract: A fuel injection valve coupled to a common rail is provided. When fuel injection is carried out, the fuel pressure in the fuel injection valve pulsates. An interval between a pilot injection and a main injection is set so that the main injection is carried out at a zero gradient timing as a timing when the gradient of the fuel pressure in the fuel injection valve after the pilot injection is approximately equal to zero. Owing to a fuel injection control apparatus and a fuel injection control method for an internal combustion engine that perform the above-mentioned control, the fuel injection amount for the subsequent fuel injection following the preceding fuel injection can be reliably held equal to a normal amount.Type: ApplicationFiled: July 18, 2008Publication date: May 13, 2010Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takashi Koyama, Hisashi Ohki, Kiyoshi Fujiwara, Tomohiro Kaneko, Takahumi Yamada
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Publication number: 20100108024Abstract: According to an internal combustion engine fuel injection control apparatus and control method, when an operating region of the engine shifts from a fuel cut region in which no fuel is injected to a low load region in which a small amount of fuel is injected, or visa versa, at least one pilot injection is executed ahead of a main injection in the low load region, and the number of pilot injections is determined according to the engine coolant temperature. This injection control makes it possible to ensure drivability while suppressing the amount of HC produced.Type: ApplicationFiled: June 11, 2009Publication date: May 6, 2010Applicant: Toyota Jidosha Kabushiki KaishaInventors: Seiji Ogura, Hisashi Ohki, Takashi Koyama
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Publication number: 20100043747Abstract: An object of the present invention is to control the discharge amount of unburned fuel components in the internal combustion engine. According the present invention, the number of times of execution of sub fuel injection is changed based on the operation range within which the operation state of the internal combustion engine falls so that the lower the engine load of the internal combustion engine is, and the lower the number of engine revolutions of the internal combustion engine is, the more the number of times of execution of sub fuel injection is increased. Furthermore, the lower the atmospheric pressure is, the lower the temperature of the cooling water of the internal combustion engine is, or the lower the temperature of the intake air of the internal combustion engine is, the more an operation range in which the number of times of execution of sub fuel injection is large is expanded to higher loads and higher revolutions.Type: ApplicationFiled: April 28, 2008Publication date: February 25, 2010Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takashi Koyama, Hisashi Ohki, Masahiro Nagae, Kiyoshi Fujiwara, Tomohiro Kaneko, Takafumi Yamada, Hajime Shimizu, Seiji Ogura
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Patent number: 7464542Abstract: An exhaust gas purification system for an internal combustion engine can quickly recover the exhaust gas purification ability of an exhaust gas purification device by increasing opportunities to release the SOx occluded in the exhaust gas purification device. In the exhaust gas purification system having the exhaust gas purification device having the property of occluding the SOx in the exhaust gas emitted from the internal combustion engine and collecting particulate matter contained in the exhaust gas, when the load of the internal combustion engine falls within a load range in which SOx poisoning recovery control can be executed, during the time when the particulate matter is oxidized and removed by collection ability regeneration control (S105), the collection ability regeneration control is interrupted and the SOx poisoning recovery control is executed (S106, S107).Type: GrantFiled: August 11, 2006Date of Patent: December 16, 2008Assignee: Toyota Jidosha Kabushiki KaishaInventors: Shunsuke Toshioka, Masaaki Kobayashi, Hisashi Ohki, Masaaki Yamaguchi, Kotaro Hayashi
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Patent number: 7308654Abstract: Characteristic menu information corresponding to applications are stored in a menu storage unit. A menu development unit discriminates an application which is now started and develops a menu corresponding to the application on a screen using the stored menu information. In the menu operation, a menu is developed on the screen by operating a defined button, a menu item is selected by scrawling while the menu is being developed and the selected menu item is executed by operating the defined button.Type: GrantFiled: January 22, 2001Date of Patent: December 11, 2007Assignee: Fujitsu LimitedInventors: Masato Ageta, Chikako Kariya, Toshihisa Masuzawa, Yuji Aoyama, Hisashi Ohki, Mitsuru Kodama, Ryoji Hirayama
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Patent number: 7246485Abstract: Removal of fine particles by oxidation or/and sulfur poisoning recovery control may be required when an internal combustion engine has been in an extremely low load state for a predetermined period or more. In this case, the engine speed of the internal combustion engine (1) is adjusted to a range where the temperature of a filter (20) can be raised by heat-up control. The heat-up control is then executed by a filter temperature control means to raise the temperature of the filter (20) to a predetermined value. When the filter (20) reaches the predetermined temperature by means of low-temperature combustion, post-injection, VIGOM-injection, addition of 10 fuel to an exhaust system and the like, removal of fine particles by oxidation or/and sulfur poisoning recovery control for eliminating sulfur poisoning of a NOx absorbent are conducted.Type: GrantFiled: October 14, 2002Date of Patent: July 24, 2007Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hisashi Ohki, Masaaki Kobayashi, Naofumi Magarida, Daisuke Shibata, Shinobu Ishiyama, Akihiko Negami
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Patent number: 7165394Abstract: An exhaust gas purification system for an internal combustion engine can quickly recover the exhaust gas purification ability of an exhaust gas purification device by increasing opportunities to release the SOx occluded in the exhaust gas purification device. In the exhaust gas purification system having the exhaust gas purification device having the property of occluding the SOx in the exhaust gas emitted from the internal combustion engine and collecting particulate matter contained in the exhaust gas, when the load of the internal combustion engine falls within a load range in which SOx poisoning recovery control can be executed, during the time when the particulate matter is oxidized and removed by collection ability regeneration control (S105), the collection ability regeneration control is interrupted and the SOx poisoning recovery control is executed (S106, S107).Type: GrantFiled: May 12, 2004Date of Patent: January 23, 2007Assignee: Toyota Jidosha Kabushiki KaishaInventors: Shunsuke Toshioka, Masaaki Kobayashi, Hisashi Ohki, Masaaki Yamaguchi, Kotaro Hayashi
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Publication number: 20070000237Abstract: An exhaust gas purification system for an internal combustion engine can quickly recover the exhaust gas purification ability of an exhaust gas purification device by increasing opportunities to release the SOx occluded in the exhaust gas purification device. In the exhaust gas purification system having the exhaust gas purification device having the property of occluding the SOx in the exhaust gas emitted from the internal combustion engine and collecting particulate matter contained in the exhaust gas, when the load of the internal combustion engine falls within a load range in which SOx poisoning recovery control can be executed, during the time when the particulate matter is oxidized and removed by collection ability regeneration control (S105), the collection ability regeneration control is interrupted and the SOx poisoning recovery control is executed (S106, S107).Type: ApplicationFiled: August 11, 2006Publication date: January 4, 2007Applicant: Toyota Jidosha Kabushiki KaishaInventors: Shunsuke Toshioka, Masaaki Kobayashi, Hisashi Ohki, Masaaki Yamaguchi, Kotaro Hayashi
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Patent number: 6922988Abstract: An exhaust emission control apparatus for an internal combustion engine is capable of suppressing a nasty smell due to the hydrogen sulfide generated upon recovery from SOx poisoning.Type: GrantFiled: December 16, 2003Date of Patent: August 2, 2005Assignee: Toyota Jidosha Kabushikia KaishaInventors: Masaaki Yamaguchi, Hisashi Ohki, Masaaki Kobayashi, Daisuke Shibata
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Publication number: 20050050881Abstract: An exhaust gas purification system for an internal combustion engine can quickly recover the exhaust gas purification ability of an exhaust gas purification device by increasing opportunities to release the SOx occluded in the exhaust gas purification device. In the exhaust gas purification system having the exhaust gas purification device having the property of occluding the SOx in the exhaust gas emitted from the internal combustion engine and collecting particulate matter contained in the exhaust gas, when the load of the internal combustion engine falls within a load range in which SOx poisoning recovery control can be executed, during the time when the particulate matter is oxidized and removed by collection ability regeneration control (S105), the collection ability regeneration control is interrupted and the SOx poisoning recovery control is executed (S106, S107).Type: ApplicationFiled: May 12, 2004Publication date: March 10, 2005Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shunsuke Toshioka, Masaaki Kobayashi, Hisashi Ohki, Masaaki Yamaguchi, Kotaro Hayashi