Patents by Inventor Masaki Nagashima
Masaki Nagashima 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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Publication number: 20170234254Abstract: A variety of methods and arrangements are described for controlling transitions between firing fractions during skip fire operation of an engine in order to help reduce undesirable NVH consequences and otherwise smooth the transitions. In general, both feed forward and feedback control are utilized in the determination of the firing fractions during transitions such that the resulting changes in the firing fraction better track cylinder air charge changing dynamics associated with the transition.Type: ApplicationFiled: May 5, 2016Publication date: August 17, 2017Inventors: Masaki NAGASHIMA, Mohammad R. PIRJABERI, Louis J. SERRANO
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Publication number: 20170087624Abstract: A mold flux is used in continuous casting of Ti-containing hypo-peritectic steel so as to prevent longitudinal cracks from forming on a surface of a slab. The mold flux contains CaO, SiO2, an alkali metal oxide and a fluorine compound as major components. f(1), f(2) and f(3), which are calculated from the initial chemical composition, are (1.1?0.5×T) to (1.9?0.5×T), 0.05 to 0.40 and 0 to 0.40, respectively, if the Ti content of the molten steel (mass %) is T. The TiO2 content in the melting state during the casting is no more than 20 mass % and the ratio of the first peak height of perovskite to the first peak height of cuspidine in the mold flux film is no more than 1.0.Type: ApplicationFiled: June 2, 2015Publication date: March 30, 2017Inventors: Masahito HANAO, Masaki NAGASHIMA, Masatsugu ISHIBASHI
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Publication number: 20170051689Abstract: A variety of methods and arrangements for reducing noise, vibration and harshness (NVH) in a skip fire engine control system are described. In one aspect, a firing sequence is used to operate the engine in a skip fire manner A smoothing torque is determined that is applied to a powertrain by an energy storage/release device. The smoothing torque is arranged to at least partially cancel out variation in torque generated by the skip fire firing sequence. Various methods, powertrain controllers, arrangements and computer software related to the above operations are also described.Type: ApplicationFiled: November 1, 2016Publication date: February 23, 2017Inventors: Louis J. SERRANO, Xin YUAN, John W. PARSELS, Mohammad R. PIRJABERI, Mark A. WILCUTTS, Masaki NAGASHIMA
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Patent number: 9562470Abstract: Methods and systems are described for detecting valve actuation faults in internal combustion engines operating in a skip fire operational mode. In one aspect, a torque model is used to estimate an expected net torque during a selected operating window. The torque model considers an expected torque contribution from each of the cylinders and accounts for the effects of specific skip fire firing decisions that affect the expected torque contribution from each cylinder. A parameter indicative of the actual engine torque is also measured. Valve actuation faults can then be identified based at least in part on a comparison of the measured parameter to an expected parameter value that is based at least in part on the expected net torque. With the described approaches, the occurrence of the valve actuation fault can be made within one engine cycle of the initial occurrence of the fault.Type: GrantFiled: April 30, 2015Date of Patent: February 7, 2017Assignee: Tula Technology, Inc.Inventors: Matthew A. Younkins, Shikui Kevin Chen, Li-Chun Chien, Masaki Nagashima, John W. Parsels, Geoff Routledge
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Patent number: 9512794Abstract: A variety of methods and arrangements for reducing noise, vibration and harshness (NVH) in a skip fire engine control system are described. In one aspect, a firing sequence is used to operate the engine in a skip fire manner. A smoothing torque is determined that is applied to a powertrain by an energy storage/release device. The smoothing torque is arranged to at least partially cancel out variation in torque generated by the skip fire firing sequence. Various methods, powertrain controllers, arrangements and computer software related to the above operations are also described.Type: GrantFiled: January 11, 2016Date of Patent: December 6, 2016Assignee: Tula Technology, Inc.Inventors: Louis J. Serrano, Xin Yuan, John W. Parsels, Mohammad R. Pirjaberi, Mark A. Wilcutts, Masaki Nagashima
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Publication number: 20160201586Abstract: A variety of methods and arrangements for reducing noise, vibration and harshness (NVH) in a skip fire engine control system are described. In one aspect, a firing sequence is used to operate the engine in a skip fire manner. A smoothing torque is determined that is applied to a powertrain by an energy storage/release device. The smoothing torque is arranged to at least partially cancel out variation in torque generated by the skip fire firing sequence. Various methods, powertrain controllers, arrangements and computer software related to the above operations are also described.Type: ApplicationFiled: January 11, 2016Publication date: July 14, 2016Inventors: Louis J. SERRANO, Xin YUAN, John W. PARSELS, Mohammad R. PIRJABERI, Mark A. WILCUTTS, Masaki NAGASHIMA
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Publication number: 20160109330Abstract: A variety of methods and arrangements for detecting misfire and other engine-related errors are described. In one aspect, a window is assigned to a target firing opportunity for a target working chamber. There is an attempt to fire a target working chamber during the target firing opportunity. A change in an engine parameter (e.g., crankshaft angular acceleration) is measured during the window. A model (e.g., a pressure model) is used to help determine an expected change in the engine parameter during the target firing opportunity. Based on a comparison of the expected change and the measured change in the engine parameter, a determination is made as to whether an engine error (e.g., misfire) has occurred.Type: ApplicationFiled: October 12, 2015Publication date: April 21, 2016Inventors: Shikui Kevin CHEN, Masaki NAGASHIMA, Li-Chun CHIEN
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Publication number: 20150233289Abstract: Methods and systems are described for detecting valve actuation faults in internal combustion engines operating in a skip fire operational mode. In one aspect, a torque model is used to estimate an expected net torque during a selected operating window. The torque model considers an expected torque contribution from each of the cylinders and accounts for the effects of specific skip fire firing decisions that affect the expected torque contribution from each cylinder. A parameter indicative of the actual engine torque is also measured. Valve actuation faults can then be identified based at least in part on a comparison of the measured parameter to an expected parameter value that is based at least in part on the expected net torque. With the described approaches, the occurrence of the valve actuation fault can be made within one engine cycle of the initial occurrence of the fault.Type: ApplicationFiled: April 30, 2015Publication date: August 20, 2015Inventors: Matthew A. YOUNKINS, Shikui Kevin CHEN, Li-Chun CHIEN, Masaki NAGASHIMA, John W. PARSELS, Geoff ROUTLEDGE
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Patent number: 9052242Abstract: A cast piece surface temperature measuring device includes: a magnetic field exciting device which applies an AC magnetic field substantially perpendicular to a surface of a cast piece; a magnetic field detecting device which detects the AC magnetic field to detect a magnetic flux varied in response to a surface temperature of the cast piece; and a surface temperature deriving device which derives the surface temperature of the cast piece based on an induced electromotive force obtained by detecting the AC magnetic field by the magnetic field detecting device and a predetermined relation data.Type: GrantFiled: January 8, 2010Date of Patent: June 9, 2015Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Hiroshi Harada, Masanori Yamana, Atsushi Saida, Masaki Nagashima, Tomohiro Konno
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Patent number: 8154823Abstract: An information recording and reproducing apparatus 1 having a high efficiency of information transfer includes one or more recording media forming a plurality of recording surfaces, a plurality of heads respectively disposed on the recording surfaces, a first actuator for supporting the heads and moving the heads uniformly, a plurality of second actuators provided one for an associated one of the heads, the second actuators moving the heads independently relative to the first actuator, recording processing circuits for simultaneously outputting recording signals, and reproducing processing circuits simultaneously supplied with reproduced signals read out by the heads to reproduce information from the reproduced signals.Type: GrantFiled: June 17, 2009Date of Patent: April 10, 2012Assignee: Hitachi, Ltd.Inventors: Hideki Saga, Masaki Nagashima
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Publication number: 20120038353Abstract: A cast piece surface temperature measuring device includes: a magnetic field exciting device which applies an AC magnetic field substantially perpendicular to a surface of a cast piece; a magnetic field detecting device which detects the AC magnetic field to detect a magnetic flux varied in response to a surface temperature of the cast piece; and a surface temperature deriving device which derives the surface temperature of the cast piece based on an induced electromotive force obtained by detecting the AC magnetic field by the magnetic field detecting device and a predetermined relation data.Type: ApplicationFiled: January 8, 2010Publication date: February 16, 2012Inventors: Hiroshi Harada, Masanori Yamana, Atsushi Saida, Masaki Nagashima, Tomohiro Konno
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Patent number: 7869157Abstract: In a dual-stage actuator magnetic drive having a coarse actuator and a fine actuator, an amplitude level of a command signal for the fine actuator during a decoupling-path control depends on a gain of an applied fine actuator model. The fine actuator model gain depends on the amplitude level of the fine actuator command signal and needs to be calibrated to avoid performance degradation. The gain is calibrated by determining a deviation of the fine actuator model gain from the fine actuator gain during decoupling-path control. This deviation is obtained by comparing gain values of the open-loop transfer functions measured for the decoupling-path control case and the single coarse actuator control case with respect to the feedback loop of the coarse actuator at an excitation signal frequency, when the excitation signal is added to the coarse actuator.Type: GrantFiled: June 10, 2009Date of Patent: January 11, 2011Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Masaki Nagashima, Shinsuke Nakagawa
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Publication number: 20100053798Abstract: An information recording and reproducing apparatus 1 having a high efficiency of information transfer includes one or more recording media forming a plurality of recording surfaces, a plurality of heads respectively disposed on the recording surfaces, a first actuator for supporting the heads and moving the heads uniformly, a plurality of second actuators provided one for an associated one of the heads, the second actuators moving the heads independently relative to the first actuator, recording processing circuits for simultaneously outputting recording signals, and reproducing processing circuits simultaneously supplied with reproduced signals read out by the heads to reproduce information from the reproduced signals.Type: ApplicationFiled: June 17, 2009Publication date: March 4, 2010Inventors: Hideki SAGA, Masaki Nagashima
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Publication number: 20090310250Abstract: In a dual-stage actuator magnetic drive having a coarse actuator and a fine actuator, an amplitude level of a command signal for the fine actuator during a decoupling-path control depends on a gain of an applied fine actuator model. The fine actuator model gain depends on the amplitude level of the fine actuator command signal and needs to be calibrated to avoid performance degradation. The gain is calibrated by determining a deviation of the fine actuator model gain from the fine actuator gain during decoupling-path control. This deviation is obtained by comparing gain values of the open-loop transfer functions measured for the decoupling-path control case and the single coarse actuator control case with respect to the feedback loop of the coarse actuator at an excitation signal frequency, when the excitation signal is added to the coarse actuator.Type: ApplicationFiled: June 10, 2009Publication date: December 17, 2009Applicant: Hitachi Global Storage Technologies Netherlands, B.V.Inventors: Masaki Nagashima, Shinsuke Nakagawa
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Patent number: 7561369Abstract: Embodiments in accordance with the present invention provide a drive unit that is capable of satisfactorily performing the positioning control with disturbance components included in a position error signal being effectively controlled. According to one embodiment, an error signal generator of a drive unit generates a position error signal (PES) on the basis of servo data read out from a magnetic disk. On the assumption that a frequency of a periodic variation component included in the PES is a target frequency, if a target frequency deviates from an effective frequency range of a digital filter, a downsampler down-samples the PES, and then supplies the PES to the digital filter so that the effective frequency range is shifted. As a result, within the shifted effective frequency range, a setting changing unit can control a setting frequency of the digital filter so that the setting frequency follows the target frequency.Type: GrantFiled: August 21, 2007Date of Patent: July 14, 2009Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kazuaki Usui, Masashi Kisaka, Hidefumi Tominaga, Koumei Hanaoka, Masaki Nagashima
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Publication number: 20080297942Abstract: Embodiments in accordance with the present invention provide a drive unit that is capable of satisfactorily performing the positioning control with disturbance components included in a position error signal being effectively controlled. According to one embodiment, an error signal generator of a drive unit generates a position error signal (PES) on the basis of servo data read out from a magnetic disk. On the assumption that a frequency of a periodic variation component included in the PES is a target frequency, if a target frequency deviates from an effective frequency range of a digital filter, a downsampler down-samples the PES, and then supplies the PES to the digital filter so that the effective frequency range is shifted. As a result, within the shifted effective frequency range, a setting changing unit can control a setting frequency of the digital filter so that the setting frequency follows the target frequency.Type: ApplicationFiled: August 21, 2007Publication date: December 4, 2008Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kazuaki Usui, Masashi Kisaka, Hidefumi Tominaga, Koumei Hanaoka, Masaki Nagashima
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Patent number: 5954854Abstract: Method for recovering etchant from etching waste liquid 11 containing iron chloride is disclosed, wherein iron powder is mixed with iron chloride waste solution containing metal ions having a lesser ionization tendency than iron ion in an mixing vessel so as to cause a reaction between the iron powder and the metal ions and remove the precipitated metal from the iron chloride waste solution.Type: GrantFiled: June 26, 1997Date of Patent: September 21, 1999Assignee: Astec Irie Co., Ltd.Inventors: Tsutomu Inoshita, Tadao Kitazawa, Hiroyuki Matsumoto, Masaki Nagashima, Hiroshi Yoshino, Yonejiro Nagaoka, Katsumasa Mito