Patents by Inventor Ryoso Masaki
Ryoso Masaki 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: 20040056748Abstract: An angle-torque sensor has: a torque detection coil that detects a change in state quantity in a mechanism to detect a relative angle made between input axis and output axis of a torsion bar to be twisted by a torque; an angle detection coil that detects a change in state quantity in a mechanism to detect a rotation angle of a reduction axis which rotates with a rotation being transmitted from the input axis or output axis and being reduced by a reduction mechanism; a torque detection circuit that detects the relative angle from the output of the torque detection coil; and an angle detection circuit that detects the rotation angle from the output of the angle detection coil.Type: ApplicationFiled: July 31, 2003Publication date: March 25, 2004Inventors: Ryoso Masaki, Satoru Kaneko, Kohji Maki, Ryoichi Menju
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Publication number: 20040051495Abstract: A provide a position-sensorless motor control apparatus comprises a salient-pole AC motor 2, a PWM inverter 3 for applying voltage to the AC motor 2, and a controller 1 for controlling the PWM inverter 3 by means of PWM signals, wherein the controller 1 has a position estimation means 11 which detects motor inductance in the pre-determined direction to the vector direction of the current that flows through the AC motor 2 and estimates the AC motor's rotor position based on the motor inductance.Type: ApplicationFiled: March 18, 2003Publication date: March 18, 2004Inventors: Satoru Kaneko, Ryoso Masaki, Takefumi Sawada
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Patent number: 6700343Abstract: In order to propose an inexpensive and highly precise motor controller, it is structured so as to detect the position of the rotor on the basis of the difference between the real current differential vector and the reference current differential vector, thereby control the motor without using a rotation position sensor.Type: GrantFiled: August 9, 2002Date of Patent: March 2, 2004Assignee: Hitachi, Ltd.Inventors: Ryoso Masaki, Satoru Kaneko, Yoshimi Sakurai
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Patent number: 6696812Abstract: A control apparatus controls a voltage applied to an AC motor from a power converter with a PWM signal, and has two different magnetic pole position-estimating units which estimate a rotor magnetic pole position of the AC motor, and has a switching unit which selects any one of these two kinds of magnetic pole position-estimating units.Type: GrantFiled: September 20, 2001Date of Patent: February 24, 2004Assignee: Hitachi, Ltd.Inventors: Satoru Kaneko, Ryoso Masaki, Yasuo Morooka, Mitsuyuki Hombu, Hiroshi Katayama
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Patent number: 6692405Abstract: Disclosed is a power transmission apparatus for an automobile comprising an engine 1, a generator 15 driven by an output of the engine 1, and a motor 29 driven by a generation output of the generator 15 and a discharge output of a battery 47, wherein a clutch mechanism 23 is provided between an output shaft of the engine 1 and an output shaft of the generator 15. In a hybrid vehicle, a loss caused by an inertia torque of the generator can be avoided.Type: GrantFiled: March 27, 2002Date of Patent: February 17, 2004Assignee: Hitachi, Ltd.Inventors: Toshimichi Minowa, Ryoso Masaki, Toshiyuki Innami, Yuzo Kadomukai
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Patent number: 6653745Abstract: A power source apparatus includes a first switching element for controlling the power feed in the direction from a high-voltage battery to an inverter, and a second switching element for the power feed in the direction from the inverter to a low-voltage battery, and the voltage at the direct current side is controlled to be higher than that of the high-voltage battery when a battery controller for controlling the first and second switching elements breaks down.Type: GrantFiled: September 25, 2000Date of Patent: November 25, 2003Assignee: Hitachi, Ltd.Inventors: Ryoso Masaki, Masahiko Amano, Mutsuhiro Mori, Hideki Miyazaki, Kazuo Tahara, Keiichi Mashino
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Publication number: 20030128009Abstract: A motor control apparatus includes an inverter for applying voltage to a synchronous motor and a control apparatus 4 for calculating a voltage instruction value to be applied by a PWM signal. There are provided a current difference sensing unit of the synchronous motor, a current difference calculation unit for calculating a current change attributed to the voltage applied, and a position sensing unit for estimating a counter electromotive force direction according to the current change sensed by the current change sensing unit and the current change calculated by the current difference calculation unit. The magnetic pole position of the rotor of the synchronous motor is estimated according to the counter electromotive force direction estimated by the position sensing unit and the voltage applied to the synchronous motor is controlled according to the estimated magnetic pole position.Type: ApplicationFiled: December 27, 2002Publication date: July 10, 2003Applicant: Hitachi, Ltd.Inventors: Yoshimi Sakurai, Yoshitaka Iwaji, Ryoso Masaki
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Patent number: 6557656Abstract: In a driving system comprising an engine, a plurality of motor-generators and a plurality of coaxial differential mechanisms, rotating output axes of the plurality of motor-generators are disposed parallel to and opposite to a rotating output axis of the engine. The coaxial differential mechanisms are arranged between the engine and the motors. The coaxial differential mechanisms are disposed so that straight lines passing through rotating axes of at least two of the coaxial differential mechanisms are parallel to each other, and the output power of the engine is transmitted to the coaxial differential mechanisms through gears. It is possible to provide a small sized and high productive driving system.Type: GrantFiled: December 6, 2001Date of Patent: May 6, 2003Assignee: Hitachi, Ltd.Inventors: Tomoyuki Haniu, Ryoso Masaki, Masahiko Amano, Taizo Miyazaki, Yasuo Morooka
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Patent number: 6555988Abstract: In an arrangement having an electric power inverter 2 which applies a voltage to an AC motor 1 and a control unit 4 which calculates a voltage command value applied in PWM signals, detection use voltages Vup, Vvp and Vwp are applied in synchronism with PWM signal generation use carrier waves in the control unit 4 as well as motor currents iv and iv are detected in response to current detection pulses Pd in synchronism therewith. In a magnetic pole position detection unit 12, counter electromotive forces of the synchronous motor 1 are estimated from a relationship between the detection use voltages Vup, Vvp and Vwp and current difference vectors of the motor current to determine a magnetic pole position &thgr; through calculation. The determined magnetic pole position &thgr; is inputted to coordinate conversion units 8 and 11 and a motor speed detection unit 13.Type: GrantFiled: December 1, 2000Date of Patent: April 29, 2003Assignee: Hitachi, Ltd.Inventors: Ryoso Masaki, Satoru Kaneko, Sanshiro Obara, Mitsuyuki Hombu, Yoshimi Sakurai
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Publication number: 20030020429Abstract: In order to propose an inexpensive and highly precise motor controller, it is structured so as to detect the position of the rotor on the basis of the difference between the real current differential vector and the reference current differential vector, thereby control the motor without using a rotation position sensor.Type: ApplicationFiled: August 9, 2002Publication date: January 30, 2003Applicant: Hitachi, Ltd.Inventors: Ryoso Masaki, Satoru Kaneko, Yoshimi Sakurai
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Publication number: 20030020428Abstract: In order to propose an inexpensive and highly precise motor controller, it is structured so as to detect the position of the rotor on the basis of the difference between the real current differential vector and the reference current differential vector, thereby control the motor without using a rotation position sensor.Type: ApplicationFiled: February 28, 2002Publication date: January 30, 2003Applicant: Hitachi, Ltd.Inventors: Ryoso Masaki, Satoru Kaneko, Yoshimi Sakurai
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Patent number: 6507127Abstract: An altitude calculation unit 44 estimates an inclination of a road from vehicle speed and vehicle drive torque, and calculates altitude of a vehicle. A battery management unit 43 calculate difference between average altitude determined from the past altitude history and the present altitude and varies a target value of battery charging rate or upper and lower limit values thereof in response to the difference. Charging and discharging command value is calculated in response to difference between charging rate detection value and the target value or the upper and lower limit values. An integrated control unit 22 sets output share between an engine and a motor based on vehicle target drive torque calculated by a target toque determination unit 21 and charging and discharging command from the battery management unit 43, determines an optimum operation point of the engine and issues a control command to the engine and the motor.Type: GrantFiled: September 25, 2000Date of Patent: January 14, 2003Assignee: Hitachi, Ltd.Inventors: Masahiko Amano, Ryoso Masaki, Taizo Miyazaki, Tomoyuki Hanyu
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Patent number: 6501243Abstract: A digital calculation apparatus 4 including a position-detection means 14 for detecting the magnetic pole position, based on the detected current difference values of the synchronous motor 1 in a two-phase short-circuit state, takes in current flowing in the synchronous motor by generating an interruption trigger signal in synchronization with the PWM signals for driving an inverter 3, and driving an A/D converter with the generated trigger signal.Type: GrantFiled: August 31, 2000Date of Patent: December 31, 2002Assignee: Hitachi, Ltd.Inventors: Satoru Kaneko, Ryoso Masaki, Yasuo Morooka
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Publication number: 20020163319Abstract: A control apparatus controls a voltage applied to an AC motor from a power converter with a PWM signal, and has two different magnetic pole position-estimating units which estimate a rotor magnetic pole position of the AC motor, and has a switching unit which selects any one of these two kinds of magnetic pole position-estimating units.Type: ApplicationFiled: September 20, 2001Publication date: November 7, 2002Inventors: Satoru Kaneko, Ryoso Masaki, Yasuo Morooka, Mitsuyuki Hombu, Hiroshi Katayama
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Patent number: 6470983Abstract: A hybrid vehicle is disclosed, in which the drive torque is controlled according to a target, and the engine operating point and the battery charging rate are controlled thereby as targeted to improve the fuel consumption rate of the hybrid vehicle as a whole. An engine torque estimating unit 41 estimates the engine torque based on the motor current, and an engine output correction unit 42 calculates a correct value of the throttle opening based on the difference between the estimated value and the target value. The battery management unit 43, on the other hand, calculates a target battery charge/discharge rate based on the navigation information and the battery charging rate. The engine output correction unit 44 calculates and outputs the correction value of the target battery charge/discharge value based on the difference between the target battery charge/discharge current and the actual current.Type: GrantFiled: March 14, 2000Date of Patent: October 29, 2002Assignee: Hitachi, Ltd.Inventors: Masahiko Amano, Ryoso Masaki, Taizo Miyazaki, Tomoyuki Hanyu
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Patent number: 6456030Abstract: A synchronous motor control system includes a synchronous motor 1, an inverter 3 and a controller 4 wherein a current differential detecting unit 13 detects a variation of a motor current when the three phases of the motor 1 is short circuited by the inverter 3, namely at the moment when a carrier wave in a PWM signal generator 9 assumes maximum or minimum value, in a calculating unit 14 a phase &ggr; from &agr; axis of a stationary coordinate system to a three phase short circuited current differential vector is calculated, a phase &dgr; is estimated from d axis to the three phase short circuited current differential vector by making use of d axis current id and q axis current iq on d-q axes coordinate system in the controller 4, thereafter the magnetic pole position &thgr; with respect to &agr; axis is calculated from the phases &ggr; and &dgr;, based on thus calculated magnetic pole position &thgr;, d-q axes control units 11, 7 and 8 are constituted to control the synchronous motor, thereby a highly reliabType: GrantFiled: May 29, 2001Date of Patent: September 24, 2002Assignee: Hitachi, Ltd.Inventors: Ryoso Masaki, Satoru Kaneko
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Publication number: 20020117990Abstract: A synchronous motor controlling apparatus which can be applied to the carrier synchronized position estimating method as well and have protection-related functions such as detection of inverted magnetic pole position of a motor in a simple method, and an electric motor using the synchronous motor control apparatus. A controller controls a voltage applied to an AC motor with a PWM signal. A magnetic pole position detector of the controller detects a current of the AC motor to estimate a pole position of the AC motor. A fault detector detects a fault in the estimated magnetic position of the AC motor.Type: ApplicationFiled: August 10, 2001Publication date: August 29, 2002Applicant: Hitachi Ltd.Inventors: Takefumi Sawada, Satoru Kaneko, Ryoso Masaki, Mitsuyuki Hombu, Hiroshi Katayama
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Patent number: 6440036Abstract: Disclosed is a power transmission apparatus for an automobile comprising an engine 1, a generator 15 driven by an output of the engine 1, and a motor 29 driven by a generation output of the generator 15 and a discharge output of a battery 47, wherein a clutch mechanism 23 is provided between an output shaft of the engine 1 and an output shaft of the generator 15. In a hybrid vehicle, a loss caused by an inertia torque of the generator can be avoided.Type: GrantFiled: April 27, 2001Date of Patent: August 27, 2002Assignee: Hitachi, Ltd.Inventors: Toshimichi Minowa, Ryoso Masaki, Toshiyuki Innami, Yuzo Kadomukai
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Patent number: 6426608Abstract: In an automobile power supply where plural voltages can be supplied, a plurality of batteries and a DC/DC converter are assumed to be unnecessary, and it is possible to operate even when the controller breaks down. High-voltage terminal 11 and low-voltage terminal 12 are provided in battery 6. High-voltage FET 4 for controlling the power supply in one direction from high-voltage terminal 11 to inverter 3 is connected between inverter 3 and high-voltage terminal 11. Low-voltage FET 5 for controlling the power supply in one direction from inverter 3 to low-voltage terminal 12 between inverter 3 and low-voltage terminal 12 is connected.Type: GrantFiled: June 19, 2001Date of Patent: July 30, 2002Assignee: Hitachi, Ltd.Inventors: Masahiko Amano, Ryoso Masaki, Yasuo Morooka
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Publication number: 20020098941Abstract: Disclosed is a power transmission apparatus for an automobile comprising an engine 1, a generator 15 driven by an output of the engine 1, and a motor 29 driven by a generation output of the generator 15 and a discharge output of a battery 47, wherein a clutch mechanism 23 is provided between an output shaft of the engine 1 and an output shaft of the generator 15. In a hybrid vehicle, a loss caused by an inertia torque of the generator can be avoided.Type: ApplicationFiled: March 27, 2002Publication date: July 25, 2002Applicant: Hitachi, Ltd.Inventors: Toshimichi Minowa, Ryoso Masaki, Toshiyuki Innami, Yuzo Kadomukai