Patents by Inventor Yuji Takatsuka
Yuji Takatsuka 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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Patent number: 7539567Abstract: An electric power steering control includes a torque sensor for detecting steering torque as torque information, a motor for generating assist torque, a calculation section for calculating a motor current command value based on the torque information at each predetermined sampling period, and a motor current control section for driving and controlling the motor based on the motor current command value. The calculation section includes a first target current calculation section for calculating a first target current based on the torque information detected in a time series manner at a first control period corresponding to the sampling period, and a second target current calculation section for calculating a second target current based on the first target current at a second control period shorter than the first control period. The motor current control section controls the motor by using the second target current as the motor current command value.Type: GrantFiled: March 17, 2006Date of Patent: May 26, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Yuji Takatsuka
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Publication number: 20070073462Abstract: An electric power steering control includes a torque sensor for detecting steering torque as torque information, a motor for generating assist torque, a calculation section for calculating a motor current command value based on the torque information at each predetermined sampling period, and a motor current control section for driving and controlling the motor based on the motor current command value. The calculation section includes a first target current calculation section for calculating a first target current based on the torque information detected in a time series manner at a first control period corresponding to the sampling period, and a second target current calculation section for calculating a second target current based on the first target current at a second control period shorter than the first control period. The motor current control section controls the motor by using the second target current as the motor current command value.Type: ApplicationFiled: March 17, 2006Publication date: March 29, 2007Inventor: Yuji Takatsuka
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Patent number: 6902028Abstract: Conventionally, there was a problem that in cases when it is difficult to place a temperature sensor in the vicinity of a heat-generating portion, overheating could not be prevented.Type: GrantFiled: June 10, 2004Date of Patent: June 7, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Takatsuka, Katsuhiko Ohmae, Norihiro Yamaguchi, Susumu Zeniya, Takayuki Kifuku, Shigeki Ohtagaki
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Patent number: 6860361Abstract: Conventionally, there was a problem that in cases when it is difficult to place a temperature sensor in the vicinity of a heat-generating portion, overheating could not be prevented.Type: GrantFiled: August 6, 2003Date of Patent: March 1, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Takatsuka, Katsuhiko Ohmae, Norihiro Yamaguchi, Susumu Zeniya, Takayuki Kifuku, Shigeki Ohtagaki
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Publication number: 20040222037Abstract: Conventionally, there was a problem that in cases when it is difficult to place a temperature sensor in the vicinity of a heat-generating portion, overheating could not be prevented.Type: ApplicationFiled: June 10, 2004Publication date: November 11, 2004Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Yuji Takatsuka, Katsuhiko Ohmae, Norihiro Yamaguchi, Susumu Zeniya, Takayuki Kifuku, Shigeki Ohtagaki
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Publication number: 20040026161Abstract: Conventionally, there was a problem that in cases when it is difficult to place a temperature sensor in the vicinity of a heat-generating portion, overheating could not be prevented.Type: ApplicationFiled: August 6, 2003Publication date: February 12, 2004Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Yuji Takatsuka, Katsuhiko Ohmae, Norihiro Yamaguchi, Susumu Zeniya, Takayuki Kifuku, Shigeki Ohtagaki
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Patent number: 6497303Abstract: An electric power steering system is proposed in which it is possible to inspect function of switches connected to a motor. An electric power steering system having a CPU 2 for calculating a control amount for controlling a motor 3 corresponding to a steering torque 1 and a driving circuit 8 for driving the motor 3, comprises a first switch 12 connected in series with the motor 3, a voltage monitoring circuit 10 for monitoring motor voltage, and a drive restricting circuit 11 for restricting operation of the driving circuit 8 besides the CPU 2, and in which the CPU 2 inspects function of the first switch 12 from drive of the driving circuit 8 and results detected by the voltage monitoring circuit 10 when it is judged that the driving circuit 8 is not restricted from a situation of the steering torque 1 or the drive inhibiting circuit 11.Type: GrantFiled: October 17, 2000Date of Patent: December 24, 2002Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroshi Nishimura, Shigeki Ohtagaki, Kazuo Kikuta, Yuji Takatsuka
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Publication number: 20020179363Abstract: Conventionally, there was a problem that in cases when it is difficult to place a temperature sensor in the vicinity of a heat-generating portion, overheating could not be prevented.Type: ApplicationFiled: November 29, 2001Publication date: December 5, 2002Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Yuji Takatsuka, Katsuhiko Ohmae, Norihiro Yamaguchi, Susumu Zeniya, Takayuki Kifuku, Shigeki Ohtagaki
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Patent number: 6070692Abstract: An electric power steering control system in which the steering "feel" is improved, having a steering force detector an electric motor for producing an auxiliary steering force, a motor current detector and a control unit for deciding the motor current value and rotational direction at least in accordance with the detected steering force. The motor current is limited in accordance with the detected steering force and motor current values.Type: GrantFiled: September 15, 1999Date of Patent: June 6, 2000Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhisa Nishino, Yuji Takatsuka, Shun-Ichi Wada
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Patent number: 6054827Abstract: A current flowing to a motor 8 for generating a steering assist force for a steering mechanism is detected by a motor current detecting circuit 24 to be inputted to a controller 10 as a motor current detection value IMS. The controller 10 arithmetically determines deviation between the motor current detection value IMS and a desired motor current value IMT preset on the basis of a vehicle speed and a detected steering assist torque value and decides abnormality of the motor current detecting circuit 24 when the deviation indicates an abnormal value over a period equal to or longer than a predetermined time.Type: GrantFiled: May 1, 1998Date of Patent: April 25, 2000Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Takatsuka, Shunichi Wada
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Patent number: 5988310Abstract: An electric power steering control system in which the steering "feel" is improved, having a steering force detector an electric motor for producing an auxiliary steering force, a motor current detector and a control unit for deciding the motor current value and rotational direction at least in accordance with the detected steering force. The motor current is limited in accordance with the detected steering force and motor current values.Type: GrantFiled: September 29, 1998Date of Patent: November 23, 1999Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhisa Nishino, Yuji Takatsuka, Shun-Ichi Wada
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Patent number: 5889376Abstract: A motor driving apparatus which makes it possible to continue a suppressed power supply to an electric motor even when a detected value (Id) of a current flowing to an H-bridge circuit indicates abnormality, to thereby prevent occurrence of shock in a system in which the motor is employed as a drive source. The apparatus includes a current detecting device (12) for detecting an electric current (I) flowing to an H-bridge circuit (1), and a control device (20) which includes an abnormality decision device (24) for determining abnormality of the detected current value (Id) outputted from the current detecting device (12). When the detected current value (Id) indicates abnormality, both of the ones (Q1; Q4) of the transistors (Q1; Q2 and Q3; Q4) inserted at the side of the power supply source (3) and the ground (GND), respectively, are driven under the PWM control.Type: GrantFiled: October 28, 1996Date of Patent: March 30, 1999Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yuji Takatsuka, Shigeki Ohtagaki
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Patent number: 5878360Abstract: An electric power steering control apparatus is intended to improve the convergence and control stability of a returning motion of a steering wheel when a driver of a vehicle on which the apparatus is installed lets his or her hands free from the steering wheel, and to reduce a burden to the driver when an excessive steering torque occurs during the returning motion. The apparatus includes a steering torque sensor 8 for detecting a steering torque of a steering system of the vehicle, a motor rotational-speed detector 7 for detecting a rotational speed of the electric motor, and a rotational-speed controller for controlling the electric motor based on output signals from the steering torque sensor and the motor rotational-speed sensor so that when the steering torque as detected is less than a predetermined torque value, the rotational speed of the electric motor does not exceed a predetermined speed value corresponding to the predetermined torque value.Type: GrantFiled: June 7, 1995Date of Patent: March 2, 1999Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhisa Nishino, Yuji Takatsuka, Shunichi Wada
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Patent number: 5839537Abstract: An electric power steering control system in which the steering "feel" is improved, having a steering force detector an electric motor for producing an auxiliary steering force, a motor current detector and a control unit for deciding the motor current value and rotational direction at least in accordance with the detected steering force. The motor current is limited in accordance with the detected steering force and motor current values.Type: GrantFiled: September 21, 1995Date of Patent: November 24, 1998Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhisa Nishino, Yuji Takatsuka, Shun-Ichi Wada
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Patent number: 5682314Abstract: A controller apparatus for a vehicle includes a computer for controlling devices mounted in the vehicle, and a detector means for detecting the state of the computer immediately before the computer enters a reset state. The computer determines its processing contents on the basis of the detection result of the detection means immediately after the computer is started. Thus, the controller apparatus detects the abnormal reset of the computer in control, thereby assuring the safe control of the devices.Type: GrantFiled: March 21, 1995Date of Patent: October 28, 1997Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhisa Nishino, Yuji Takatsuka, Shunichi Wada
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Patent number: 5652487Abstract: In a electric power steering controller, an output signal of motor driving direction discrimination means is compared with a driving direction discrimination processing result to detect a failure of the motor driving direction discriminator in accordance with the comparison result, so as to prevent the runaway of a motor supplying steering force to a steering wheel.Type: GrantFiled: August 11, 1995Date of Patent: July 29, 1997Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhisa Nishino, Yuji Takatsuka, Shunichi Wada