Patents by Inventor Masahiko Kurishige
Masahiko Kurishige 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: 20120185132Abstract: An electric power steering control device includes: a vibration extracting filter for performing filter processing on a rotation speed of a motor to reduce a gain on a low frequency side so as to output a vibration-component signal; a current variable gain map for detecting a current flowing through the motor as a first state quantity so as to calculate a current variable gain based on the current; a rotation-speed variable gain map for detecting the rotation speed of the motor as a second state quantity so as to calculate a rotation-speed variable gain based on the rotation speed; a correction mechanism calculating a vibration suppression current; and current controller calculating a target current so as to control the current flowing through the motor.Type: ApplicationFiled: October 21, 2010Publication date: July 19, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Isao Kezobo, Masahiko Kurishige, Masaya Endo, Takayuki Kifuku
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Publication number: 20120103294Abstract: An engine starting device for an automatic idling stop system includes: a crank angle sensor for detecting a crank angle of an engine; a ring gear connected to a crankshaft of the engine, for transmitting rotation of the engine; ring gear rpm detecting section; a starter motor for starting the engine; a pinion gear for transmitting rotation of the starter motor to the ring gear; pinion-gear push-out section for pushing out the pinion gear into meshing engagement with the ring gear; and pinion gear push-out control section for driving the pinion-gear push-out section to bring the pinion gear and the ring gear into meshing engagement when the ring gear rpm detected by the ring gear rotational speed detection section becomes smaller than a threshold value which is determined by at least one of the crank angle, a gear range, and a restart condition.Type: ApplicationFiled: April 15, 2010Publication date: May 3, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Hiroaki Kitano, Masahiko Kurishige, Daisuke Mizuno, Koichiro Kamei, Shiro Yonezawa, Kazuhiro Odahara, Naohito Kaneda
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Patent number: 8155818Abstract: Provided is a vehicle control system which can maintain stability of the vehicle with an inexpensive configuration without bringing discomfort to a driver when control intervenes.Type: GrantFiled: September 27, 2007Date of Patent: April 10, 2012Assignee: Mitsubishi Electric CorporationInventors: Kenji Nakajima, Toshihide Satake, Hiroshi Fujioka, Takanori Matsunaga, Masahiko Kurishige
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Patent number: 8046131Abstract: Provided is a vehicular steering apparatus capable of improving a steering feeling and achieving a reduction in cost. The vehicular steering apparatus according to the present invention is equipped with an assist motor for generating an assist torque, a state quantity detector for detecting a steering shaft reaction torque and a road surface reaction torque, and a control unit for calculating a target current value of the assist motor. The control unit includes a friction compensation portion and a return compensation portion, which calculate a friction compensation torque for compensating for the assist torque and a return compensation torque for compensating for the assist torque from the steering shaft reaction torque and the road surface reaction torque respectively. The control unit compensates for an overall friction torque in a steering mechanism and a gradient of the road surface reaction torque, using the friction compensation torque and the return compensation torque.Type: GrantFiled: November 2, 2006Date of Patent: October 25, 2011Assignee: Mitsubishi Electric CorporationInventors: Hideyuki Tanaka, Takanori Matsunaga, Masahiko Kurishige, Takayuki Kifuku
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Patent number: 8019507Abstract: In an electric power steering control system, a phase compensator of the steering torque is made of an analog circuit and an anti-phase compensator is made by the software of a microcomputer, thereby to eliminate the changes in the gain and the phase by the phase compensator of the analog circuit near the oscillation frequency, so that the steering torque signal equivalent to that of no phase compensation necessary for the computation at the observer is computed from the phase-compensated steering torque signal.Type: GrantFiled: December 7, 2010Date of Patent: September 13, 2011Assignee: Mitsubishi Electric CorporationInventors: Masahiko Kurishige, Takayuki Kifuku, Seiji Sakanishi, Masaharu Tanaka, Seiji Sawada, Akinobu Sugiyama, Hanako Hamada
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Patent number: 7983815Abstract: In an electric power steering control system, a phase compensator of the steering torque is made of an analog circuit and an anti-phase compensator is made by the software of a microcomputer, thereby to eliminate the changes in the gain and the phase by the phase compensator of the analog circuit near the oscillation frequency, so that the steering torque signal equivalent to that of no phase compensation necessary for the computation at the observer is computed from the phase-compensated steering torque signal.Type: GrantFiled: March 12, 2007Date of Patent: July 19, 2011Assignee: Mitsubishi Electric CorporationInventors: Masahiko Kurishige, Takayuki Kifuku, Seiji Sakanishi, Masaharu Tanaka, Seiji Sawada, Akinobu Sugiyama, Hanako Hamada
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Publication number: 20110153162Abstract: A motor-driven power steering control apparatus is achieved, which uses a small-amplitude pass filter, the filter filtering out a component having a small amplitude, to remove a steering component from dynamic state quantity such as a rotational speed signal, and to accurately extract only a vibration component having a small amplitude compared with the steering component, and controls the vibration component to be reduced.Type: ApplicationFiled: December 14, 2007Publication date: June 23, 2011Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Isao Kezobo, Masahiko Kurishige, Masaya Endo, Takayuki Kifuku, Seiji Sawada, Masaki Matsushita
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Publication number: 20110137525Abstract: Intended is to solve the problem of an increase in the cost of an electric power steering control system, the oscillations of which are suppressed by estimating and feeding back the oscillation frequency components of a motor rotating speed through an observer from a steering torque signal and a current signal for driving a motor, no matter whether a phase compensator might be made of an analog circuit or a software. In order to solve this problem, there is provided the electric power steering control system, in which the phase compensator of the steering torque is made of an analog circuit and in which an anti-phase compensator is made over the software of a microcomputer, thereby to eliminate the changes in the gain and the phase by the phase compensator of the analog circuit near the oscillation frequency, so that the steering torque signal equivalent to that of no phase compensation necessary for the computation at the observer is computed from the phase-compensated steering torque signal.Type: ApplicationFiled: December 7, 2010Publication date: June 9, 2011Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masahiko KURISHIGE, Takayuki KIFUKU, Seiji SAKANISHI, Masaharu TANAKA, Seiji SAWADA, Akinobu SUGIYAMA, Hanako HAMADA
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Publication number: 20110054740Abstract: To obtain an electric power steering control apparatus hard to generate vibration even when accuracy is not high enough for torque vibration of extremely small output of torque detecting means.Type: ApplicationFiled: November 4, 2008Publication date: March 3, 2011Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masahiko Kurishige, Takayuki Kifuku, Koji Nagao
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Publication number: 20100324785Abstract: Provided is an electric power steering control device capable of performing damping control without current detection to perform stable damping control even when a target current and an actual current value differ from each other. The electric power steering control device includes steering torque detection means for detecting a steering torque, a torque controller for computing an assist torque current, a motor for generating a torque for assisting the steering torque, rotation speed estimation means for estimating a rotation speed of the motor, and a damping controller for computing a damping current by using an estimated value of the rotation speed of the motor.Type: ApplicationFiled: October 8, 2008Publication date: December 23, 2010Applicant: Mitsubishi Electric CorporationInventors: Masahiko Kurishige, Takayuki Kifuku, Koji Nagao
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Publication number: 20100286870Abstract: To accurately extract a pulsating component generated due to a cogging torque or a torque ripple to reduce a pulsation, the pulsating component is extracted using a bandpass filter having a variable time constant, and the time constant is set according to a frequency of cogging torque or torque ripple to be extracted. Further, a reference angle for a rotation angle of a motor is preset according to a generation harmonic order of the cogging torque or torque ripple, and the time constant of the bandpass filter is set from a time period required for the motor to rotate by the reference angle.Type: ApplicationFiled: January 30, 2008Publication date: November 11, 2010Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masaya Endo, Masahiko Kurishige, Isao Kezobo
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Publication number: 20100256896Abstract: An engine-starting device for stopping the engine after satisfaction of an idling-stop condition during idling of a vehicle, starting rotation of a starter-motor upon satisfaction of a starter-motor rotation start condition, and causing a pinion gear to mesh with a ring gear upon satisfaction of a pinion gear meshing condition, includes the ring gear to be connected to a crank shaft, the pinion gear for transmitting the starter-motor rotation, a plunger for causing the pinion gear to mesh with the ring gear, and a starter control section for instructing energization of the starter-motor, in which the starter-motor is energized to be rotated upon the satisfaction of the starter-motor rotation start condition prior to clearing of the idling-stop condition in response to a restart request, and the pinion gear is caused to mesh with the ring gear by the plunger upon the satisfaction of the pinion gear meshing condition.Type: ApplicationFiled: September 14, 2009Publication date: October 7, 2010Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Hiroaki KITANO, Masahiko KURISHIGE, Akihiko IMAGI, Daisuke MIZUNO, Koichiro KAMEI, Kazuhiro ODAHARA, Naohito KANEDA
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Publication number: 20100235047Abstract: Intended is to solve the problem of an increase in the cost of an electric power steering control system, the oscillations of which are suppressed by estimating and feeding back the oscillation frequency components of a motor rotating speed through an observer from a steering torque signal and a current signal for driving a motor, no matter whether a phase compensator might be made of an analog circuit or a software. In order to solve this problem, there is provided the electric power steering control system, in which the phase compensator of the steering torque is made of an analog circuit and in which an anti-phase compensator is made over the software of a microcomputer, thereby to eliminate the changes in the gain and the phase by the phase compensator of the analog circuit near the oscillation frequency, so that the steering torque signal equivalent to that of no phase compensation necessary for the computation at the observer is computed from the phase-compensated steering torque signal.Type: ApplicationFiled: March 12, 2007Publication date: September 16, 2010Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Masahiko Kurishige, Takayuki Kifuku, Seiji Sakanishi, Masaharu Tanaka, Seiji Sawada, Akinobu Sugiyama, Hanako Hamada
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Publication number: 20090204284Abstract: Provided is a vehicle control system which can maintain stability of the vehicle with an inexpensive configuration without bringing discomfort to a driver when control intervenes.Type: ApplicationFiled: September 27, 2007Publication date: August 13, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Kenji Nakajima, Toshihide Satake, Hiroshi Fujioka, Takanori Matsunaga, Masahiko Kurishige
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Patent number: 7571033Abstract: System for detecting stability/instability of behavior of a motor vehicle upon occurrence of tire slip or lock. State of the motor vehicle is determined on the basis of an alignment torque (Ta) applied from a road and a side slip angle (?). By taking advantage of such torque/slip-angle characteristic that although the alignment torque is proportional to a side slip angle when the latter is small, the alignment torque becomes smaller as the side slip angle increases, a normal value is determined from a straight line slope and the side slip angle in a region where the latter is small. Unstable behavior of the motor vehicle is determined when deviation of actual measured value from the normal value increases. Further, unstable state is determined when the slope of the alignment torque for the slip angle departs significantly from that of approximate straight line slope.Type: GrantFiled: January 7, 2005Date of Patent: August 4, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroshi Fujioka, Takanori Matsunaga, Takashi Maeda, Toshinori Matsui, Masahiko Kurishige, Hideyuki Tanaka
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Patent number: 7454279Abstract: System for detecting stability/instability of behavior of a motor vehicle upon occurrence of tire slip or lock. State of the motor vehicle is determined on the basis of an alignment torque (Ta) applied from a road and a side slip angle (?). By taking advantage of such torque/slip-angle characteristic that although the alignment torque is proportional to a side slip angle when the latter is small, the alignment torque becomes smaller as the side slip angle increases, a normal value is determined from a straight line slope and the side slip angle in a region where the latter is small. Unstable behavior of the motor vehicle is determined when deviation of actual measured value from the normal value increases. Further, unstable state is determined when the slope of the alignment torque for the slip angle departs significantly from that of approximate straight line slope.Type: GrantFiled: January 7, 2005Date of Patent: November 18, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroshi Fujioka, Takanori Matsunaga, Takashi Maeda, Toshinori Matsui, Masahiko Kurishige, Hideyuki Tanaka
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Patent number: 7412318Abstract: System for detecting stability/instability of behavior of a motor vehicle upon occurrence of tire slip or lock. State of the motor vehicle is determined on the basis of an alignment torque (Ta) applied from a road and a side slip angle (?). By taking advantage of such torque/slip-angle characteristic that although the alignment torque is proportional to a side slip angle when the latter is small, the alignment torque becomes smaller as the side slip angle increases, a normal value is determined from a straight line slope and the side slip angle in a region where the latter is small. Unstable behavior of the motor vehicle is determined when deviation of actual measured value from the normal value increases. Further, unstable state is determined when the slope of the alignment torque for the slip angle departs significantly from that of approximate straight line slope.Type: GrantFiled: January 7, 2005Date of Patent: August 12, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroshi Fujioka, Takanori Matsunaga, Takashi Maeda, Toshinori Matsui, Masahiko Kurishige, Hideyuki Tanaka
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Patent number: 7412319Abstract: System for detecting stability/instability of behavior of a motor vehicle upon occurrence of tire slip or lock. State of the motor vehicle is determined on the basis of an alignment torque (Ta) applied from a road and a side slip angle (?). By taking advantage of such torque/slip-angle characteristic that although the alignment torque is proportional to a side slip angle when the latter is small, the alignment torque becomes smaller as the side slip angle increases, a normal value is determined from a straight line slope and the side slip angle in a region where the latter is small. Unstable behavior of the motor vehicle is determined when deviation of actual measured value from the normal value increases. Further, unstable state is determined when the slope of the alignment torque for the slip angle departs significantly from that of approximate straight line slope.Type: GrantFiled: January 7, 2005Date of Patent: August 12, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroshi Fujioka, Takanori Matsunaga, Takashi Maeda, Toshinori Matsui, Masahiko Kurishige, Hideyuki Tanaka
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Publication number: 20080189014Abstract: Provided is a vehicular steering apparatus capable of improving a steering feeling and achieving a reduction in cost. The vehicular steering apparatus according to the present invention is equipped with an assist motor for generating an assist torque, a state quantity detector for detecting a steering shaft reaction torque and a road surface reaction torque, and a control unit for calculating a target current value of the assist motor. The control unit includes a friction compensation portion and a return compensation portion, which calculate a friction compensation torque for compensating for the assist torque and a return compensation torque for compensating for the assist torque from the steering shaft reaction torque and the road surface reaction torque respectively. The control unit compensates for an overall friction torque in a steering mechanism and a gradient of the road surface reaction torque, using the friction compensation torque and the return compensation torque.Type: ApplicationFiled: November 2, 2006Publication date: August 7, 2008Inventors: Hideyuki Tanaka, Takanori Matsunaga, Masahiko Kurishige, Takayuki Kifuku
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Patent number: 7349775Abstract: System for detecting stability/instability of behavior of a motor vehicle upon occurrence of tire slip or lock. State of the motor vehicle is determined on the basis of an alignment torque (Ta) applied from a road and a side slip angle (?). By taking advantage of such torque/slip-angle characteristic that although the alignment torque is proportional to a side slip angle when the latter is small, the alignment torque becomes smaller as the side slip angle increases, a normal value is determined from a straight line slope and the side slip angle in a region where the latter is small. Unstable behavior of the motor vehicle is determined when deviation of actual measured value from the normal value increases. Further, unstable state is determined when the slope of the alignment torque for the slip angle departs significantly from that of approximate straight line slope.Type: GrantFiled: January 7, 2005Date of Patent: March 25, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroshi Fujioka, Takanori Matsunaga, Takashi Maeda, Toshinori Matsui, Masahiko Kurishige, Hideyuki Tanaka