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Hirofumi Nishimura, Toshimitsu Minowa, Yasuhiko Arai: Speech synthesizing system and redundancy-reduced waveform database therefor. Matsushita Electric Industrial, Lowe Hauptman Gopstein Gilman & Berner, September 26, 2000: US06125346 (92 worldwide citation)

A speech synthesizing system using a redundancy-reduced waveform database is disclosed. Each waveform of a sample set of voice segments necessary and sufficient for speech synthesis is divided into pitch waveforms, which are classified into groups of pitch waveforms closely similar to one another. O ...


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Hirofumi Nishimura, Yasuyuki Morita: Variable valve mechanism for internal combustion engines. Mazda Motor Corporation, Fleit Jacobson Cohn & Price, September 1, 1987: US04690110 (41 worldwide citation)

A variable valve mechanism for an internal combustion engine including a central cam of a smaller lift and a pair of side cams located at the opposite sides of the central cam symmetrically with each other with respect to the central cam. A rocker arm device includes a pair of side arm sections enga ...


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Hirofumi Nishimura, Tadataka Nakazumi, Ken Umehara, Takanobu Morimasa, Masanori Misumi: Method of and system for purifying exhaust gas for engines. Mazda Motor Corporation, Donald R Studebaker, Sixbey Friedman Leedom & Ferguson, September 14, 1999: US05950419 (40 worldwide citation)

Exhaust gas temperature is raised after a cold engine start so as to rapidly activate a catalyst in an exhaust line by retarding an ignition timing at which an air-fuel mixture is fired in the engine to a point after top-dead-center during a certain time interval and promoting combustion of the air- ...


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Hirofumi Nishimura, Yasuyuki Morita: Variable valve mechanism for internal combustion engines. Mazda Motor Corporation, Fleit Jacobson Cohn & Price, February 23, 1988: US04726332 (40 worldwide citation)

A variable valve mechanism for an engine including a first rocker arm engaged at one end with the valve tappet and at the other end with a low speed profile cam, and a second rocker arm engaged with a high speed profile cam. A locking device is provided on the second rocker arm to releasably lock th ...


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Hirofumi Nishimura, Keiji Araki: Fuel control apparatus for an engine. Mazda Motor Corporation, Donald R Studebaker, Nixon Peabody, May 13, 2003: US06560960 (38 worldwide citation)

In the case that an engine is operated in a state where an in-cylinder air/fuel ratio is lean in a stratified combustion region and a fuel cut control is performed under a predetermined condition, when catalysts are in a low temperature state where a purification performance is deteriorated or when ...


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Hirofumi Nishimura, Tomomi Watanabe, Junichi Taga, Michihiro Imada: Engine control method. Mazda Motor Corporation, Martin Fleit, June 8, 1999: US05909724 (25 worldwide citation)

An engine combustion condition judging method for detecting a crank angle speed of a multiple cylinder engine, for judging a combustion condition of each of cylinders of the engine based on the detection of the crank angle speed, wherein the improvement includes the steps of setting a predetermined ...


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Kiyotaka Mamiya, Tadashi Kaneko, Misao Fujimoto, Hirofumi Nishimura: Knock control system for supercharged engine. Mazda Motor Corporation, Burns Doane Swecker & Mathis, March 3, 1987: US04646522 (24 worldwide citation)

A knock control system for a supercharged engine comprising a supercharger for providing a super charged air to the engine, an engine condition detector for detecting an engine operating condition, a knock detector for detecting the occurrence of engine knocking, an ignition timing determining unit, ...


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Hirofumi Nishimura, Hiroyuki Yamashita, Youichi Kuji, Noriyuki Ota: Direct fuel injection engine. Mazda Motor Corporation, Donald R Studebaker, Nixon Peabody, April 4, 2000: US06044642 (23 worldwide citation)

A direct injection engine including, an ignition plug projected into a combustion chamber, an injector for injecting a fuel directly into the combustion chamber, a catalyst provided in an exhaust gas passage for cleaning an exhaust gas, a temperature senisor for detecting a coolant temperature condi ...


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Kiyoshi Kuronishi, Kazunari Komatsu, Naoyuki Noguchi, Hirofumi Nishimura: Exhaust system for internal combustion engine. Mazda Motor Corporation, Keck Main & Cate, July 20, 1993: US05228287 (22 worldwide citation)

An exhaust system for an automobile engine having two groups of cylinders has a catalytic device. Deterioration of the catalytic device is detected based on an oxygen level in exhaust gas passed through the catalytic device. A feedback control of an air-fuel ratio is conducted for the cylinder group ...