1
Yoshiaki Tarusawa, Shigeki Saito, Yasushi Yamao, Toshio Nojima: Frequency synthesizer having compensation for nonlinearities. Nippon Telegraph and Telephone Corporation, Cushman Darby & Cushman, December 25, 1990: US04980652 (82 worldwide citation)

In a phase locked loop frequency synthesizer, the frequency of a VCO is switched by changing the division ratio of a variable ratio frequency divider in the feedback path of the loop. At the time of switching, a prepositioning voltage is applied to the VCO to realize fast frequency switching. To cor ...


2
Hideo Kawamura, Katsuyuki Tamai, Shigeki Saito, Toshihiro Yamanaka: Control system for supercharger in internal combustion engine. Isuzu Motors, Hitachi, Staas & Halsey, July 19, 1988: US04757686 (58 worldwide citation)

A motor/generator is mounted on the turbine shaft of a supercharger in an internal combustion engine. Whether the motor/generator should operate as a motor or a generator is determined by a signal from a flow rate sensor that detect the rate of fuel flow and a signal from a rotation sensor that dete ...


3
Keiji Oda, Shigeki Saito: Turbo-charger with rotary machine. Hitachi, Antonelli Terry Stout & Kraus, June 16, 1992: US05121605 (48 worldwide citation)

A turbo-charger with a rotor directly connected thereto has a turbine impeller, a turbine shaft secured to the turbine impeller and a compressor secured to the turbine shaft and driven thereby to forcibly feed air into an internal combustion engine. The rotor is provided on the turbine shaft and so ...


4
Hisatugu Ishikura, Nobuyoshi Onuma, Shigeki Saito, Hiroyosi Sakurai: Motor-driven power steering apparatus. Hitachi, Hitachi Automotive Engineering, Antonelli Terry & Wands, July 12, 1988: US04756375 (40 worldwide citation)

The present invention provides a controller for a power steering control system with a current limiter for limiting current to be fed to a power steering motor, in accordance with a power source voltage, whereby the power source is prevented from falling into an overdischarge state while a power ste ...


5
Shigeki Saito, Yasushi Yamao: Phase likelihood comparison diversity receiver. Nippon Telegraph and Telephone Corporation, Cushman Darby & Cushman, April 13, 1993: US05203023 (36 worldwide citation)

In the diversity receiver which switches between receiver branches to receive phase modulated signals, this invention can achieve a diversity effect with a circuit of simple construction which by switching between receiver branches based on relative modulation phase error, and can attain diversity e ...


6
Shigeki Saito: Digital demodulator. Nippon Telegraph and Telephone Corporation, Cushman Darby & Cushman, November 9, 1993: US05260975 (33 worldwide citation)

A digital demodulator wherein a phase difference is detected between a reference signal and an angle-modulated wave, the difference in frequency is detected between the angle-modulated carrier wave and the reference signal based on the phase difference, and the phase of the reference signal to be se ...


7
Shigeki Saito, Hiroshi Suzuki, Yoshiaki Tarusawa: Frequency divider which has a variable length first cycle by changing a division ratio after the first cycle and a frequency synthesizer using same. Nippon Telegraph and Telephone Company, Cushman Darby & Cushman, April 13, 1993: US05202906 (31 worldwide citation)

A frequency division scheme which offsets for a phase lag produced on initial power-on is described. A division ratio of a programmable counter is initially set at a first division ratio at the time of releasing the programmable counter from its reset state. When the first division cycle is complete ...


8
Hideo Kawamura, Katsuyuki Tamai, Shigeki Saito, Toshihiro Yamanaka: Auxiliary apparatus for a turbocharged internal combustion engine. Isuzu Motors, Hitachi, Staas & Halsey, May 30, 1989: US04833887 (29 worldwide citation)

Intake and exhaust ports of an internal combustion engine possess respective turbine impellers, and an electrical rotary machine is formed on a rotary shaft connecting the impellers. Sensors are provided for sensing the loaded state of the engine at all times based on engine rpm and the amount of fu ...


9
Toshimi Abukawa, Kazuo Tahara, Katsuji Murumoto, Toshiyuki Koterazawa, Mitsuyuki Hombu, Tadashi Takahashi, Shuichi Takamatsu, Hisatugu Ishikura, Hiroshisa Yamamura, Toru Tatsuzaki, Tsutomu Ohmae, Toshiaki Okuyama, Seizi Yamashita, Shigeki Saito, Masato Sakai: Electric power steering control system. Hitachi, Hitachi Automotive Engineering, Antonelli Terry & Wands, October 24, 1989: US04875539 (27 worldwide citation)

An electric power steering control system includes an electric motor for producing an assisting torque for the vehicle steering system through a reduction gear, a steering torque sensor fitted on the steering shaft, a controller for controlling the input to the motor in accordance with the torque se ...


10
Shigeki Saito, Masato Sakai: Electric power steering apparatus. Hitachi, Antonelli Terry & Wands, August 23, 1988: US04765425 (17 worldwide citation)

An electric power steering apparatus comprises a steering shaft 34, a detector 27 for detecting an operation of the power steering apparatus, an electric motor 3 driven in response to an output of the detector 27 for generating an assisting force for a steering operation, and a reduction gear 1 incl ...