Patents by Inventor Kenichi Tomomatsu

Kenichi Tomomatsu 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).

  • Patent number: 11454184
    Abstract: The control device for an internal combustion engine disclosed in the present application is a control device that determines the presence or absence of misfire based on an angle detection cycle calculated from an output signal of an angle sensor, the control device includes an arithmetic processing device and a storage device, the control device is configured so that the storage device stores the angle detection cycle calculated in a misfire detection threshold value comparison section after the reference angle section as a threshold value comparison target cycle and is configured such that the arithmetic processing device determines the presence or absence of misfire based on the misfire detection threshold value cycle calculated based on the reference detection cycle and the threshold value comparison target cycle, thereby it becomes possible to accurately determine the presence or absence of misfire in the control device for the internal combustion engine.
    Type: Grant
    Filed: March 25, 2020
    Date of Patent: September 27, 2022
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tatsuo Fujimoto, Nobuyoshi Tomomatsu, Takuma Kusagaki, Kenichi Yamagata, Kenichiro Yonezawa, Siyu Liu
  • Patent number: 11441453
    Abstract: An Oldham coupling includes: a driven Oldham flange that is formed at a drive-side rotor; a drive Oldham flange that is formed at a planetary rotor; and an Oldham intermediate that is configured to synchronize rotation of the driven Oldham flange and rotation of the drive Oldham flange. A thrust section is formed at a rotor plate portion which is a portion other than the Oldham coupling. The thrust section is configured to limit tilting of the planetary rotor relative to the driven Oldham flange when the thrust section contacts the planetary rotor in an axial direction. There is satisfied a relationship of ?2>?1 where: ?1 is a maximum tilt amount of the planetary rotor relative to the driven Oldham flange; and ?2 is a maximum tilt amount of the planetary rotor in a clearance formed at the Oldham coupling.
    Type: Grant
    Filed: September 13, 2021
    Date of Patent: September 13, 2022
    Assignee: DENSO CORPORATION
    Inventors: Makoto Otsubo, Kenichi Tomomatsu, Shuhei Yamamoto, Hiroki Takahashi, Soichi Kinouchi
  • Patent number: 11339689
    Abstract: A bearing portion of a planetary rotatable body for providing bearing support in a thrust direction is defined as a planetary thrust bearing portion. A driving-side rotatable body or a driven-side rotatable body, which is configured to contact the planetary thrust bearing portion in the thrust direction, is defined as a specific rotatable body. A bearing portion of the specific rotatable body for providing bearing support in the thrust direction is defined as a specific thrust bearing portion. In a parallel state where the specific thrust bearing portion and the planetary thrust bearing portion are parallel to each other, the specific thrust bearing portion and the planetary thrust bearing portion contact with each other only on one of an eccentric side and a counter-eccentric side of the planetary rotatable body while the counter-eccentric side is opposite to the eccentric side.
    Type: Grant
    Filed: June 3, 2021
    Date of Patent: May 24, 2022
    Assignee: DENSO CORPORATION
    Inventors: Makoto Otsubo, Hiroki Takahashi, Kenichi Tomomatsu, Shuhei Yamamoto
  • Publication number: 20210404351
    Abstract: An Oldham coupling includes: a driven Oldham flange that is formed at a drive-side rotor; a drive Oldham flange that is formed at a planetary rotor; and an Oldham intermediate that is configured to synchronize rotation of the driven Oldham flange and rotation of the drive Oldham flange. A thrust section is formed at a rotor plate portion which is a portion other than the Oldham coupling. The thrust section is configured to limit tilting of the planetary rotor relative to the driven Oldham flange when the thrust section contacts the planetary rotor in an axial direction. There is satisfied a relationship of ?2>?1 where: ?1 is a maximum tilt amount of the planetary rotor relative to the driven Oldham flange; and ?2 is a maximum tilt amount of the planetary rotor in a clearance formed at the Oldham coupling.
    Type: Application
    Filed: September 13, 2021
    Publication date: December 30, 2021
    Inventors: Makoto Otsubo, Kenichi Tomomatsu, Shuhei Yamamoto, Hiroki Takahashi, Soichi Kinouchi
  • Publication number: 20210404352
    Abstract: A drive-side rotor is rotated synchronously with a crankshaft. A driven-side rotor is rotated integrally with a camshaft. An internal gear section is formed at the driven-side rotor. An Oldham coupling includes: a driven Oldham flange that is formed at the drive-side rotor; a drive Oldham flange that is formed at the planetary rotor; and an Oldham intermediate that is configured to synchronize rotation of the driven Oldham flange and rotation of the drive Oldham flange while permitting eccentricity between the driven Oldham flange and the drive Oldham flange. There is satisfied a relationship of ?2<?1 where: ?1 is a maximum tilt amount of the planetary rotor relative to the driven Oldham flange; and ?2 is a maximum tilt amount of the planetary rotor in a clearance formed at the Oldham coupling.
    Type: Application
    Filed: September 13, 2021
    Publication date: December 30, 2021
    Inventors: Makoto OTSUBO, Kenichi TOMOMATSU, Shuhei YAMAMOTO, Hiroki TAKAHASHI, Soichi KINOUCHI
  • Publication number: 20210285344
    Abstract: A bearing portion of a planetary rotatable body for providing bearing support in a thrust direction is defined as a planetary thrust bearing portion. A driving-side rotatable body or a driven-side rotatable body, which is configured to contact the planetary thrust bearing portion in the thrust direction, is defined as a specific rotatable body. A bearing portion of the specific rotatable body for providing bearing support in the thrust direction is defined as a specific thrust bearing portion. In a parallel state where the specific thrust bearing portion and the planetary thrust bearing portion are parallel to each other, the specific thrust bearing portion and the planetary thrust bearing portion contact with each other only on one of an eccentric side and a counter-eccentric side of the planetary rotatable body while the counter-eccentric side is opposite to the eccentric side.
    Type: Application
    Filed: June 3, 2021
    Publication date: September 16, 2021
    Inventors: Makoto OTSUBO, Hiroki TAKAHASHI, Kenichi TOMOMATSU, Shuhei YAMAMOTO
  • Patent number: 10443468
    Abstract: The fuel addition system comprises: a fuel addition valve, a fuel tank, a first pressure storage chamber storing fuel to be supplied to a fuel injector, a supply pump increasing a pressure of fuel inside the fuel tank and supplying the fuel to the first pressure storage chamber, a pressure reduction valve discharging fuel stored in the first pressure storage chamber, a pressure reduction fuel passage supplying fuel discharged from the first pressure storage chamber to the fuel addition valve, and a control device controlling the fuel addition valve and the pressure reduction valve. The control device detects or estimates a temperature of fuel supplied to the fuel addition valve and, when injecting fuel from the fuel addition valve, controls an amount of fuel discharged from the first pressure storage chamber through the pressure reduction valve so that the temperature of the fuel becomes a reference temperature or more.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: October 15, 2019
    Assignees: Soken, Inc., Toyota Jidosha Kabushiki Kaisha
    Inventors: Tetsuro Serai, Kenichi Tomomatsu, Takayoshi Kojima, Naoki Toda, Kazuhiro Umemoto, Toshihiro Mori, Hiromasa Nishioka
  • Publication number: 20180238218
    Abstract: The fuel addition system comprises: a fuel addition valve, a fuel tank, a first pressure storage chamber storing fuel to be supplied to a fuel injector, a supply pump increasing a pressure of fuel inside the fuel tank and supplying the fuel to the first pressure storage chamber, a pressure reduction valve discharging fuel stored in the first pressure storage chamber, a pressure reduction fuel passage supplying fuel discharged from the first pressure storage chamber to the fuel addition valve, and a control device controlling the fuel addition valve and the pressure reduction valve. The control device detects or estimates a temperature of fuel supplied to the fuel addition valve and, when injecting fuel from the fuel addition valve, controls an amount of fuel discharged from the first pressure storage chamber through the pressure reduction valve so that the temperature of the fuel becomes a reference temperature or more.
    Type: Application
    Filed: January 12, 2018
    Publication date: August 23, 2018
    Applicants: SOKEN INC., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tetsuro SERAI, Kenichi TOMOMATSU, Takayoshi KOJIMA, Naoki TODA, Kazuhiro UMEMOTO, Toshihiro MORI, Hiromasa NISHIOKA
  • Patent number: 8123459
    Abstract: A fuel pump has substantially coaxial outer and inner pump chambers. An impeller has partition walls correspondingly to the inner pump chamber to define inner vane grooves. A rear surface is located at a rear side in a rotative direction of each inner vane groove. At least a radially inner side of the rear surface inclines rearward in the rotative direction from the radially inner side to a radially outer side. A first line connects a radially inner end of the rear surface with a radially outer end of the rear surface. A second line radially extends from the radially inner end of the rear surface. The first line and the second line therebetween define a backward tilt angle ?2, which satisfies a relationship of 30°??2?80°.
    Type: Grant
    Filed: September 3, 2008
    Date of Patent: February 28, 2012
    Assignee: Denso Corporation
    Inventors: Kenichi Tomomatsu, Tadashi Hazama, Eiji Iwanari, Yuuji Nakazu, Hiromi Sakai
  • Patent number: 8007226
    Abstract: A fuel pump includes a rotatable impeller having a plurality of blades and blade ditches on the periphery thereof, a motor section for driving the impeller, and a casing member which accommodates the impeller and has at least one fuel passage along an outer periphery of the impeller. The fuel passage communicates with the blade ditches. Moreover, a radially-inside inner surface of the fuel passage, with respect to an axis of rotation of the impeller, from a centerline on a bottom of the fuel passage to a radially inside edge of the fuel passage is formed as an approximately quadrant curved surface.
    Type: Grant
    Filed: October 16, 2007
    Date of Patent: August 30, 2011
    Assignee: Denso Corporation
    Inventors: Tadashi Hazama, Eiji Iwanari, Kenichi Tomomatsu
  • Patent number: 7546833
    Abstract: A fuel feed apparatus is accommodated in a fuel tank. The fuel feed apparatus includes a sub-tank that is provided in a bottom of the fuel tank. The fuel feed apparatus further includes a fuel pump that is accommodated in the sub-tank. The fuel pump includes an impeller that defines a plurality of pump chambers. The fuel pump has a first suction passage through which fuel flows from outside the sub-tank into at least one of the plurality of pump chambers. The fuel feed apparatus further includes an elastic member that seals between the first suction passage and the sub-tank.
    Type: Grant
    Filed: January 16, 2007
    Date of Patent: June 16, 2009
    Assignee: DENSO CORPORATION
    Inventors: Kenichi Tomomatsu, Tadashi Hazama, Eiji Iwanari, Ryuji Igarashi, Katsuhisa Yamada
  • Publication number: 20090060709
    Abstract: A fuel pump has substantially coaxial outer and inner pump chambers. An impeller has partition walls correspondingly to the inner pump chamber to define inner vane grooves. A rear surface is located at a rear side in a rotative direction of each inner vane groove. At least a radially inner side of the rear surface inclines rearward in the rotative direction from the radially inner side to a radially outer side. A first line connects a radially inner end of the rear surface with a radially outer end of the rear surface. A second line radially extends from the radially inner end of the rear surface. The first line and the second line therebetween define a backward tilt angle ?2, which satisfies a relationship of 30°??2?80°.
    Type: Application
    Filed: September 3, 2008
    Publication date: March 5, 2009
    Applicant: DENSO CORPORATION
    Inventors: Kenichi TOMOMATSU, Tadashi Hazama, Eiji Iwanari, Yuuji Nakazu, Hiromi Sakai
  • Publication number: 20080138189
    Abstract: A fuel pump includes an impeller having first and second vane grooves each arranged along a rotative direction. The second vane grooves are located on a radially inner side of the first vane grooves. The fuel pump includes a pump case rotatably accommodating the impeller and having first and second pump passages. The first pump passage is defined along the first vane grooves for supplying fuel from a sub-tank to an engine. The second pump passage is defined along the second vane grooves for supplying fuel from the fuel tank to the sub-tank. The first and second pump passages respectively have cross sectional areas S1, S2, and respectively have diameters D1, D2 with respect to a direction of a rotation axis of the impeller. The S1, D1, S2, and D2 satisfy: 0.6?(S2×D2)/(S1×D1)?0.95.
    Type: Application
    Filed: November 28, 2007
    Publication date: June 12, 2008
    Applicant: DENSO CORPORATION
    Inventors: Tadashi HAZAMA, Eiji Iwanari, Kenichi Tomomatsu
  • Publication number: 20080089776
    Abstract: A fuel pump includes a rotatable impeller having a plurality of blades and blade ditches on the periphery thereof, a motor section for driving the impeller, and a casing member which accommodates the impeller and has at least one fuel passage along an outer periphery of the impeller. The fuel passage communicates with the blade ditches. Moreover, a radially-inside inner surface of the fuel passage, with respect to an axis of rotation of the impeller, from a centerline on a bottom of the fuel passage to a radially inside edge of the fuel passage is formed as an approximately quadrant curved surface.
    Type: Application
    Filed: October 16, 2007
    Publication date: April 17, 2008
    Applicant: DENSO CORPORATION
    Inventors: Tadashi Hazama, Eiji Iwanari, Kenichi Tomomatsu
  • Publication number: 20070199546
    Abstract: A fuel feed apparatus is accommodated in a fuel tank. The fuel feed apparatus includes a sub-tank that is provided in a bottom of the fuel tank. The fuel feed apparatus further includes a fuel pump that is accommodated in the sub-tank. The fuel pump includes an impeller that defines a plurality of pump chambers. The fuel pump has a first suction passage through which fuel flows from outside the sub-tank into at least one of the plurality of pump chambers. The fuel feed apparatus further includes an elastic member that seals between the first suction passage and the sub-tank.
    Type: Application
    Filed: January 16, 2007
    Publication date: August 30, 2007
    Applicant: DENSO CORPORATION
    Inventors: Kenichi Tomomatsu, Tadashi Hazama, Eiji Iwanari, Ryuji Igarashi, Katsuhisa Yamada
  • Patent number: 4043187
    Abstract: A method of measuring surface roughness of an object indirectly according to a tracer method by forming two different kinds of replicas. The first replica is made of a flexible material which can be easily stripped off from either the object surface or from the surface of the second replica. The second replica is made of a material with high hardness so that it will not suffer from any scratch or flaw from the tracer even when it hits the replica. Surface configuration of the object to be measured is transferred to the first replica and the surface configuration of the first replica is then transferred to the second replica, and surface roughness of this second replica is measured with a tracer.
    Type: Grant
    Filed: October 15, 1976
    Date of Patent: August 23, 1977
    Assignee: Doryokuro Kakunenryo Kaihatsu Jigyodan
    Inventor: Kenichi Tomomatsu