Patents by Inventor Kenichi Fujiki
Kenichi Fujiki 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: 7609012Abstract: In an automatic transmission position control by a motor, it is determined whether the present instant belongs to a starting period, that is, the present instant is immediately after resetting of a control unit or application of power to it. If it is the starting period, an actual shift position that is detected from an output of an output shaft sensor for detecting a rotation position of a motor is set as an instructed shift position. With this measure, even if the control unit is reset for a certain reason while the vehicle is running, the instructed shift position is not changed in association with the resetting. This prevents trouble that the shift position is switched contrary to the intention of the driver, whereby the reliability of a position switching control can be increased.Type: GrantFiled: April 4, 2007Date of Patent: October 27, 2009Assignees: DENSO Corporation, Toyota Jidosha Kabushiki KaishaInventors: Shigeru Kamio, Kenichi Fujiki, Sumiko Amamiya, Keijiro Ohshima, Yasushi Kobiki, Yuji Inoue
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Publication number: 20090193923Abstract: In an automatic transmission position control by a motor, it is determined whether the present instant belongs to a starting period, that is, the present instant is immediately after resetting of a control unit or application of power to it. If it is the starting period, an actual shift position that is detected from an output of an output shaft sensor for detecting a rotation position of a motor is set as an instructed shift position. With this measure, even if the control unit is reset for a certain reason while the vehicle is running, the instructed shift position is not changed in association with the resetting. This prevents trouble that the shift position is switched contrary to the intention of the driver, whereby the reliability of a position switching control can be increased.Type: ApplicationFiled: March 19, 2009Publication date: August 6, 2009Applicant: DENSO CorporationInventors: Yasuhiro Nakai, Shigeru Kamio, Kenichi Fujiki
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Publication number: 20090185940Abstract: The present invention enables the manufacture of a trochoid pump having a crescent which has been considered theoretically impossible by employing an inner rotor of a trochoid pump. An inner rotor having a predetermined number N of teeth that is equal to or larger than 4 is formed in advance.Type: ApplicationFiled: July 14, 2008Publication date: July 23, 2009Applicant: YAMADA MANUFACTURING CO., LTD.Inventors: Kenichi Fujiki, Masaru Amano, Keiichi Kai, Takatoshi Watanabe
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Publication number: 20090112446Abstract: To avoid potentially erroneous results, monitoring the operation of an oxygen sensor of an internal combustion engine of a motor vehicle to detect a slow response of the oxygen sensor as indicative of an oxygen sensor fault is temporarily suspended in response to a brake operation transition of a braking system of the vehicle.Type: ApplicationFiled: October 25, 2007Publication date: April 30, 2009Applicant: DENSO CORPORATIONInventors: Peter Richardson, Kenichi Fujiki
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Publication number: 20090104064Abstract: The present invention enables the manufacture of a trochoid pump having a crescent which has been considered theoretically impossible, by employing an inner rotor of a trochoid pump. An inner rotor having a predetermined number N of teeth that is equal to or larger than 4 is formed in advance.Type: ApplicationFiled: July 14, 2008Publication date: April 23, 2009Applicant: YAMADA MANUFACTURING CO., LTD.Inventors: Kenichi Fujiki, Takatoshi Watanabe
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Patent number: 7488163Abstract: A trochoid oil pump, which enables the endurance to be increased and the reduction of discharge pulsations and noise to be achieved, and in which those results can be realized with a very simple structure. An interdental space constituted by an inner rotor and an outer rotor having trochoid tooth profile or substantially trochoid tooth profile starts a compression stroke in the location of a partition section between an intake port and a discharge portion, and a linking gap L is composed by the interdental space and a preceding adjacent interdental space realized in a discharge stroke. The linking gap expands gradually from the start of compression stroke to the discharge stroke.Type: GrantFiled: December 21, 2005Date of Patent: February 10, 2009Assignee: Yamada Manufacturing Co., Ltd.Inventors: Kazuo Enzaka, Masahiro Kasahara, Yasunori Ono, Kenichi Fujiki, Keiichi Kai, Yoshiaki Senga, Atsushi Kaneko
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Publication number: 20090010791Abstract: An internal gear pump which has a crescent disposed between an outer rotor and an inner rotor having a trochoidal tooth profile, and which reduces vibrations caused by pulsations generated when the fluid is discharged. The internal gear pump has an outer rotor having internal teeth formed therein, an inner rotor disposed on the inner peripheral side of the outer rotor and having formed therein external teeth that mesh with the internal teeth, and a crescent disposed in a clearance between the outer rotor and the inner rotor. Pitch spacings of the external teeth of the inner rotor are formed as non-equal spacings, and pitch spacings of the internal teeth of the outer rotor correspond to the pitch spacings of the external teeth of the inner rotor.Type: ApplicationFiled: July 7, 2008Publication date: January 8, 2009Applicant: YAMADA MANUFACTURING CO., LTD.Inventors: Kenichi Fujiki, Takatoshi Watanabe, Masashi Sadatomi
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Publication number: 20080253904Abstract: A device for reducing friction in a variable flow rate oil pump in which two discharge ports are provided and which uses three rotors while maintaining characteristics identical to the pressure characteristics of a common oil pump. The device is configured from a first discharge passage to an engine, a return passage that returns to an intake side of an outer circumferential side rotor, a second discharge passage to the engine, a return passage that returns to an intake side of an inner circumferential side rotor, and a pressure control valve whose valve main body is provided between a discharge port from the inner circumferential side rotor and the first discharge passage.Type: ApplicationFiled: December 17, 2007Publication date: October 16, 2008Applicant: YAMADA MANUFACTURING CO., LTD.Inventors: Keiichi Kai, Kenichi Fujiki, Yasunori Ono
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Publication number: 20080236555Abstract: An air/fuel ratio control system is provided for an internal combustion engine having a plurality of cylinders and an air/fuel ratio sensor. The air/fuel ratio sensor is disposed at an exhaust gas merging portion of an exhaust passage where exhaust gas discharged from the plurality of cylinders merges together. The system includes an air/fuel ratio control device, an abnormality diagnosis device, and an enabling device. The air/fuel ratio control device individually controls an air/fuel ratio of each of the plurality of cylinders based on an output of the air/fuel ratio sensor. The abnormality diagnosis device determines whether abnormality of the air/fuel ratio sensor exists. The enabling device enables the air/fuel ratio control device to execute the controlling of the air/fuel ratio of each of the plurality of cylinders when the abnormality diagnosis device determines that the abnormality of the air/fuel ratio sensor does not exist after starting of the engine.Type: ApplicationFiled: March 13, 2008Publication date: October 2, 2008Applicant: DENSO CORPORATIONInventor: Kenichi FUJIKI
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Publication number: 20080190496Abstract: A device for reducing friction while maintaining characteristics identical to the pressure characteristics of a common oil pump based on provision of a plurality of discharge sources and a newly devised method of switching oil passages. The device is configured from a first discharge passage from a first rotor assembly to an engine, a first return passage that returns to an intake side of the first rotor assembly, a second discharge passage from a second rotor assembly to the engine, a second return passage that returns to an intake side of the second rotor assembly, and a pressure control valve whose valve main body is provided between a discharge port from the second rotor assembly and the first discharge passage.Type: ApplicationFiled: December 17, 2007Publication date: August 14, 2008Applicant: YAMADA MANUFACTURING CO., LTD.Inventors: Yasunori Ono, Keiichi Kai, Kenichi Fujiki, Kosuke Yamane
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Patent number: 7387011Abstract: A diagnosis device calculates a lean-direction responsiveness characteristic and a rich-direction responsiveness characteristic of the exhaust gas sensor. The lean-direction responsiveness represents a responsiveness of the sensor in a case that an air-fuel ratio is controlled in such a manner as to be varied in a lean direction. The rich-direction responsiveness represents a responsiveness of the sensor in a case that the air-fuel ratio is controlled in such a manner as to be varied in a rich direction. The diagnosis device determines whether the exhaust gas sensor deteriorates based on at least one of the lean-direction responsiveness characteristic and the rich-direction responsiveness characteristic, and on a comparison result between the lean-direction responsiveness characteristic and the rich-direction responsiveness characteristic.Type: GrantFiled: March 28, 2007Date of Patent: June 17, 2008Assignee: Denso CorporationInventors: Kenichi Fujiki, Yoshinori Maegawa, Jonathan Saunders, Iain Watson
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Patent number: 7384251Abstract: A trochoidal oil pump which makes it possible to achieve an improved reduction in discharge pulsation and noise, and which makes it possible to realize such a reduction using an extremely simple structure. The trochoidal oil pump of the present invention comprises a rotor chamber 1 which has an intake port 2 and discharge port 3, an outer rotor 6 and an inner rotor 5. A plurality of inter-tooth spaces S, S, . . . that are formed by the tooth shapes 5a and 6a of the inner rotor 5 and outer rotor 6 comprise a maximum sealed space Smax that is positioned in the region of the partition part 4 between the intake port 2 and discharge port 3, a plurality of inter-tooth spaces S, S, . . . within the region of the intake port 2, and a plurality of inter-tooth spaces S, S, . . . within the region of the discharge port 3. The plurality of inter-tooth spaces S, S, . . .Type: GrantFiled: July 15, 2004Date of Patent: June 10, 2008Assignee: Yamada Manufacturing Co., Ltd.Inventors: Kenichi Fujiki, Masaru Amano
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Patent number: 7312595Abstract: Presence/absence of a failure in a feedback control system of a motor is monitored. When a failure is detected in the feedback control system, the motor is driven by switching to an open-loop control. During the open-loop control, the motor is rotated by sequentially switching the motor current supply phase without feeding back encoder count information. The position count is incremented or decremented every time the current supply phase is switched. When the position count has reached a target count, it is determined that the rotor has reached a target position, whereupon the open-loop control is finished.Type: GrantFiled: May 30, 2003Date of Patent: December 25, 2007Assignee: Denso CorporationInventors: Shigeru Kamio, Kenichi Fujiki
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Publication number: 20070227124Abstract: A diagnosis device calculates a lean-direction responsiveness characteristic and a rich-direction responsiveness characteristic of the exhaust gas sensor. The lean-direction responsiveness represents a responsiveness of the sensor in a case that an air-fuel ratio is controlled in such a manner as to be varied in a lean direction. The rich-direction responsiveness represents a responsiveness of the sensor in a case that the air-fuel ratio is controlled in such a manner as to be varied in a rich direction. The diagnosis device determines whether the exhaust gas sensor deteriorates based on at least one of the lean-direction responsiveness characteristic and the rich-direction responsiveness characteristic, and on a comparison result between the lean-direction responsiveness characteristic and the rich-direction responsiveness characteristic.Type: ApplicationFiled: March 28, 2007Publication date: October 4, 2007Applicant: Denso CorporationInventors: Kenichi Fujiki, Yoshinori Maegawa, Jonathan Saunders, Iain Watson
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Publication number: 20070182353Abstract: In an automatic transmission position control by a motor, it is determined whether the present instant belongs to a starting period, that is, the present instant is immediately after resetting of a control unit or application of power to it. If it is the starting period, an actual shift position that is detected from an output of an output shaft sensor for detecting a rotation position of a motor is set as an instructed shift position. With this measure, even if the control unit is reset for a certain reason while the vehicle is running, the instructed shift position is not changed in association with the resetting. This prevents trouble that the shift position is switched contrary to the intention of the driver, whereby the reliability of a position switching control can be increased.Type: ApplicationFiled: April 4, 2007Publication date: August 9, 2007Applicants: Denso Corporation, Toyota Jidosha Kabushiki KaishaInventors: Shigeru Kamio, Kenichi Fujiki, Sumiko Amamiya, Keijiro Ohshima, Yasushi Kobiki, Yuji Inoue
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Patent number: 7221116Abstract: In an automatic transmission position control by a motor, it is determined whether the present instant belongs to a starting period, that is, the present instant is immediately after resetting of a control unit or application of power to it. If it is the starting period, an actual shift position that is detected from an output of an output shaft sensor for detecting a rotation position of a motor is set as an instructed shift position. With this measure, even if the control unit is reset for a certain reason while the vehicle is running, the instructed shift position is not changed in association with the resetting. This prevents trouble that the shift position is switched contrary to the intention of the driver, whereby the reliability of a position switching control can be increased.Type: GrantFiled: October 25, 2005Date of Patent: May 22, 2007Assignees: Denso Corporation, Toyota Jidosha Kabushiki KaishaInventors: Yasuhiro Nakai, Shigeru Kamio, Kenichi Fujiki, Sumiko Amamiya, Keijiro Ohshima, Yasushi Kobiki, Yuji Inoue
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Patent number: 7131266Abstract: When a specified air-fuel ratio F/B control condition is established during supply of a secondary air provided, an air-fuel ratio F/B control is executed, and at this time, an initial value of a target air-fuel ratio is set to a before-catalyst air-fuel ratio detected by an A/F (air-fuel ratio) sensor. The target air-fuel ratio subsequent to this is gradually changed from the initial value to a specified air-fuel ratio. By this, the initial value of the target air-fuel ratio can be suitably set at a start time of execution of the air-fuel ratio F/B control during the supply of the secondary air. The target air-fuel ratio subsequent to this is gradually changed to a stoichiometric air-fuel ratio, so that a change in engine rotation speed is suppressed and the drivability can be improved.Type: GrantFiled: March 4, 2004Date of Patent: November 7, 2006Assignee: Denso CorporationInventors: Masayuki Kita, Toru Noma, Kenichi Fujiki, Tomoyuki Takagawa
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Publication number: 20060140809Abstract: A trochoid oil pump, which enables the endurance to be increased and the reduction of discharge pulsations and noise to be achieved, and in which those results can be realized with a very simple structure. An interdental space constituted by an inner rotor and an outer rotor having trochoid tooth profile or substantially trochoid tooth profile starts a compression stroke in the location of a partition section between an intake port and a discharge portion, and a linking gap L is composed by the interdental space and a preceding adjacent interdental space realized in a discharge stroke. The linking gap expands gradually from the start of compression stroke to the discharge stroke.Type: ApplicationFiled: December 21, 2005Publication date: June 29, 2006Applicant: Yamada Manufacturing Co., Ltd.Inventors: Kazuo Enzaka, Masahiro Kasahara, Yasunori Ono, Kenichi Fujiki, Keiichi Kai, Yoshiaki Senga, Atsushi Kaneko
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Patent number: 7052258Abstract: To reduce noise caused by pulsation generated when fluid is expelled, in a trochoidal pump comprising an inner rotor and outer rotor having trochoidal toothed shapes. [Means of Solution] The inner rotor 5 and outer rotor 6 having trochoidal toothed shapes are set in such a manner that when they are in a mutually intermeshing state, a tip clearance d0 is created between the respective tooth crests 5a of the inner rotor 5 and the outer rotor 6. In at least one position of this group of tip clearances d0, a large clearance d1 forming a large interval is provided.Type: GrantFiled: July 10, 2003Date of Patent: May 30, 2006Assignee: Yamada Manufacturing Co., Ltd.Inventors: Masaru Amano, Kenichi Fujiki, Yasunori Ono
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Publication number: 20060108966Abstract: Presence/absence of a failure in a feedback control system of a motor is monitored. When a failure is detected in the feedback control system, the motor is driven by switching to an open-loop control. During the open-loop control, the motor is rotated by sequentially switching the motor current supply phase without feeding back encoder count information. The position count is incremented or decremented every time the current supply phase is switched. When the position count has reached a target count, it is determined that the rotor has reached a target position, whereupon the open-loop control is finished.Type: ApplicationFiled: December 30, 2005Publication date: May 25, 2006Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATIONInventors: Shigeru Kamio, Kenichi Fujiki, Sumiko Amamiya, Yasushi Kobiki, Yuji Inoue