Patents by Inventor Junji Tsutsumi
Junji Tsutsumi 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: 20150012160Abstract: A damping control method of a vehicle using an electric motor for suppressing vibration of the vehicle using the electric motor as a power source includes setting a drive torque target value based on vehicle information of the vehicle, and performing filter processing on the drive torque target value using a damping filter having a characteristic of removing or reducing a frequency component equivalent to torsional vibration of a vehicle drive system based on a vehicle information of the vehicle and an external disturbance suppression filter for suppressing external disturbance, the damping filter calculating a first torque target value and having a characteristic Gm(s)/Gp(s) configured by a model Gp(s) of a transfer characteristic of a torque input to the vehicle and a motor rotation speed and an ideal model Gm(s) of the transfer characteristic of the torque input and the motor rotation speed set in advance.Type: ApplicationFiled: January 24, 2013Publication date: January 8, 2015Applicant: NISSAN MOTOR CO., LTD.Inventors: Junji Tsutsumi, Akira Sawada
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Patent number: 8418800Abstract: A vehicle steering device and method for controlling steering of a steer-by-wire vehicle. A steering instrument receives input from a driver and a turning device turns the wheel(s). A selectively engageable backup clutch is positioned between the steering instrument and the turning device. Whether or not the backup clutch is engaged is based a steering state signal from the steering instrument and a turning state signal from the turning device.Type: GrantFiled: November 28, 2006Date of Patent: April 16, 2013Assignee: Nissan Motor Co., Ltd.Inventors: Junji Tsutsumi, Toshiaki Kasahara, Yuusuke Katou
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Patent number: 7971678Abstract: In a vehicle steering device and control method, a selectively engageable clutch is positioned between a steering wheel and a turning mechanism for turning at least one wheel. The clutch has an engaged position where the steering wheel is mechanically connected to the turning mechanism and a disengaged position where the steering wheel is mechanically separated from the turning mechanism for steer-by-wire control. During steer-by-wire control, a reaction force actuator applies a force to the steering wheel, and a turning actuator applies a torque to the turning mechanism. To prevent erroneous clutch engagement caused by an increase in relative angular acceleration between the steering angle and the turning angle, a controller detects an operating condition corresponding to a risk of erroneous clutch engagement and controls at least one of the turning actuator and the reaction force actuator to reduce the relative angular acceleration.Type: GrantFiled: January 11, 2008Date of Patent: July 5, 2011Assignee: Nissan Motor Co., Ltd.Inventors: Kenichi Mori, Junji Tsutsumi, Toshiaki Kasahara, Yuusuke Katou
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Patent number: 7810605Abstract: A vehicle steering device and method for preventing steering wheel pull. A selectively engageable clutch is positioned between a steering wheel and a turning mechanism for turning at least one steered wheel. The clutch includes an engaging piece and has an engaged position where the steering wheel is mechanically connected to the turning mechanism and a disengaged position where the steering wheel is mechanically separated from the turning mechanism and steer-by-wire controls the at least one steered wheel. When the clutch is moved from the engaged position to the disengaged position, clutch release control is performed that provides a rotational angle of deviation between a steering wheel shaft connected to the steering wheel and the turning mechanism, the rotational angle of deviation provided in the direction of disengagement.Type: GrantFiled: December 6, 2007Date of Patent: October 12, 2010Assignee: Nissan Motor Co., Ltd.Inventors: Toshiaki Kasahara, Yuusuke Katou, Junji Tsutsumi, Kenichi Mori
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Patent number: 7690475Abstract: A vehicle steering control apparatus includes a steering wheel to be operated by a driver, a steering mechanism for turning the front wheels in accordance with an operating torque of the steering wheel, and a clutch for mechanically connecting the steering wheel to the steering mechanism. A clutch engagement command issuing section is provided for issuing an engagement command to the clutch when the clutch is disengaged and a condition for engaging the clutch is satisfied. A clutch engagement determining section is provided for determining that the clutch is in an engaged state when an increase in torque is detected at the steering wheel after the engagement command has been issued to the clutch.Type: GrantFiled: February 20, 2007Date of Patent: April 6, 2010Assignee: Nissan Motor Co., Ltd.Inventors: Junji Tsutsumi, Toshiaki Kasahara
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Patent number: 7526372Abstract: A steering control device in which a steering portion including an electric steering reaction force actuator and a steered portion including an electric steered portion actuator are mechanically disconnectable and connectable via a backup connection. Steer-by-wire control disconnects the backup connection and uses control of the steered portion actuator to set a steered angle corresponding to the steering condition and using control of the steering reaction force actuator to add a steering reaction force corresponding to the steered condition. Steering assistance control connects the backup connection and adds a steering aid force using at least one of the steering reaction force actuator and the steered portion actuator. The power supply capacity of a steered vehicle is selectively estimated and if the estimated power supply capacity reaches a predetermined value or below during the steer-by-wire control, steering is switched to the steering assistance control.Type: GrantFiled: February 13, 2006Date of Patent: April 28, 2009Assignee: Nissan Motor Co., Ltd.Inventors: Junji Tsutsumi, Yuusuke Katou
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Publication number: 20080185213Abstract: In a vehicle steering device and control method, a selectively engageable clutch is positioned between a steering wheel and a turning mechanism for turning at least one wheel. The clutch has an engaged position where the steering wheel is mechanically connected to the turning mechanism and a disengaged position where the steering wheel is mechanically separated from the turning mechanism for steer-by-wire control. During steer-by-wire control, a reaction force actuator applies a force to the steering wheel, and a turning actuator applies a torque to the turning mechanism. To prevent erroneous clutch engagement caused by an increase in relative angular acceleration between the steering angle and the turning angle, a controller detects an operating condition corresponding to a risk of erroneous clutch engagement and controls at least one of the turning actuator and the reaction force actuator to reduce the relative angular acceleration.Type: ApplicationFiled: January 11, 2008Publication date: August 7, 2008Applicant: NISSAN MOTOR CO., LTD.Inventors: Kenichi Mori, Junji Tsutsumi, Toshiaki Kasahara, Yuusuke Katou
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Publication number: 20080156572Abstract: A vehicle steering device and method for preventing steering wheel pull. A selectively engageable clutch is positioned between a steering wheel and a turning mechanism for turning at least one steered wheel. The clutch includes an engaging piece and has an engaged position where the steering wheel is mechanically connected to the turning mechanism and a disengaged position where the steering wheel is mechanically separated from the turning mechanism and steer-by-wire controls the at least one steered wheel. When the clutch is moved from the engaged position to the disengaged position, clutch release control is performed that provides a rotational angle of deviation between a steering wheel shaft connected to the steering wheel and the turning mechanism, the rotational angle of deviation provided in the direction of disengagement.Type: ApplicationFiled: December 6, 2007Publication date: July 3, 2008Applicant: NISSAN MOTOR CO., LTD.Inventors: Toshiaki Kasahara, Yuusuke Katou, Junji Tsutsumi, Kenichi Mori
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Patent number: 7315772Abstract: In vehicular motion control apparatus and method, a vehicle speed variation rate limiter is provided to place a vehicle speed variation rate limitation on a detection value (V) of a vehicle speed and varying a vehicle speed variation rate limiter value in accordance with the detection value (?) of the vehicular steering angle, at the vehicular motion target value calculation, using an output of the vehicular speed variation rate limiter for a map reference vehicle speed (Vmap) and, at the control command value calculation, using the output of the vehicular speed variation rate limiter to the detection value of the vehicle speed for a control command value calculation purpose.Type: GrantFiled: February 2, 2004Date of Patent: January 1, 2008Assignee: Nissan Motor Co., Ltd.Inventors: Junji Tsutsumi, Hideki Sudou
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Publication number: 20070215405Abstract: A vehicle steering control apparatus includes a steering wheel to be operated by a driver, a steering mechanism for turning the front wheels in accordance with an operating torque of the steering wheel, and a clutch for mechanically connecting the steering wheel to the steering mechanism. A clutch engagement command issuing section is provided for issuing an engagement command to the clutch when the clutch is disengaged and a condition for engaging the clutch is satisfied. A clutch engagement determining section is provided for determining that the clutch is in an engaged state when an increase in torque is detected at the steering wheel after the engagement command has been issued to the clutch.Type: ApplicationFiled: February 20, 2007Publication date: September 20, 2007Applicant: Nissan Motor Co., Ltd.Inventors: Junji Tsutsumi, Toshiaki Kasahara
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Publication number: 20070144815Abstract: A vehicle steering device and method for controlling steering of a steer-by-wire vehicle. A steering instrument receives input from a driver and a turning device turns the wheel(s). A selectively engageable backup clutch is positioned between the steering instrument and the turning device. Whether or not the backup clutch is engaged is based a steering state signal from the steering instrument and a turning state signal from the turning device.Type: ApplicationFiled: November 28, 2006Publication date: June 28, 2007Applicant: Nissan Motor Co., Ltd.Inventors: Junji Tsutsumi, Toshiaki Kasahara, Yuusuke Katou
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Publication number: 20060190151Abstract: A steering control device in which a steering portion including an electric steering reaction force actuator and a steered portion including an electric steered portion actuator are mechanically disconnectable and connectable via backup means. A steer-by-wire control means is provided for disconnecting the backup means and performing steer-by-wire control using control of the steered portion actuator to set a steered angle corresponding to the steering condition and using control of the steering reaction force actuator to add a steering reaction force corresponding to the steered condition. A steering assistance control means is also provided for connecting the backup means and performing steering assistance control by adding a steering aid force using at least one of the steering reaction force actuator and the steered portion actuator.Type: ApplicationFiled: February 13, 2006Publication date: August 24, 2006Inventors: Junji Tsutsumi, Yuusuke Katou
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Patent number: 7077484Abstract: A brake control apparatus for a vehicle includes an actuating section to apply a regenerative braking force to a motor-driven wheel driven by a motor of the vehicle. A control section is arranged to vary the regenerative braking force in a direction to shift a front and rear wheel braking force distribution toward an ideal braking force distribution, in accordance with a wheel locking tendency of the motor-driven wheel when the regenerative braking force exceeding a braking force determined by the ideal braking force distribution is applied to the motor-driven wheel.Type: GrantFiled: September 26, 2002Date of Patent: July 18, 2006Assignee: Nissan Motor Co., Ltd.Inventors: Hiroki Sasaki, Hideo Nakamura, Junji Tsutsumi, Kazuhiko Tazoe, Hidetoshi Suzuki
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Publication number: 20040158375Abstract: In vehicular motion control apparatus and method, a vehicle speed variation rate limiter is provided to place a vehicle speed variation rate limitation on a detection value (V) of a vehicle speed and varying a vehicle speed variation rate limiter value in accordance with the detection value (&thgr;) of the vehicular steering angle, at the vehicular motion target value calculation, using an output of the vehicular speed variation rate limiter for a map reference vehicle speed (Vmap) and, at the control command value calculation, using the output of the vehicular speed variation rate limiter to the detection value of the vehicle speed for a control command value calculation purpose.Type: ApplicationFiled: February 2, 2004Publication date: August 12, 2004Applicant: NISSAN MOTOR CO., LTD.Inventors: Junji Tsutsumi, Hideki Sudou
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Patent number: 6739677Abstract: A brake control apparatus is configured to suppress fluctuations in the deceleration when transferring from cooperative braking to regenerative braking or hydraulic braking. The brake control apparatus calculates a braking torque command value feed forward component for reaching a target deceleration corresponding to the master cylinder pressure according to an ideal reference model. The brake control apparatus also calculates the braking torque command value feedback component to find a base deceleration for feeding back the difference between the base deceleration and the vehicle deceleration. The brake control apparatus then calculates the braking torque command value by adding the components together.Type: GrantFiled: February 12, 2003Date of Patent: May 25, 2004Assignee: Nissan Motor Co., Ltd.Inventors: Kazuhiko Tazoe, Hideo Nakamura, Junji Tsutsumi, Hiroki Sasaki
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Patent number: 6735511Abstract: A brake control system for a vehicle is comprised of a first braking device that generates a braking torque by operating a driving source of the vehicle and a second braking device that generates the braking torque by operating a hydraulic brake system of the vehicle. A controller of the brake control system is arranged to calculate a desired braking torque according to a driver's demand, to divide the desired braking torque into a low-frequency component and a high-frequency component, to command the first braking device to generate the high-frequency component, and to command at least one of the first braking device and the second braking device to generate the low-frequency component.Type: GrantFiled: January 15, 2003Date of Patent: May 11, 2004Assignee: Nissan Motor Co., Ltd.Inventors: Hideo Nakamura, Junji Tsutsumi, Kazuhiko Tazoe, Yutaka Kaneko, Hiroyuki Ashizawa
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Publication number: 20030182044Abstract: A brake control system for a vehicle is comprised of a first braking device that generates a braking torque by operating a driving source of the vehicle and a second braking device that generates the braking torque by operating a hydraulic brake system of the vehicle. A controller of the brake control system is arranged to calculate a desired braking torque according to a driver's demand, to divide the desired braking torque into a low-frequency component and a high-frequency component, to command the first braking device to generate the high-frequency component, and to command at least one of the first braking device and the second braking device to generate the low-frequency component.Type: ApplicationFiled: January 15, 2003Publication date: September 25, 2003Applicant: NISSAN MOTOR CO., LTD.Inventors: Hideo Nakamura, Junji Tsutsumi, Kazuhiko Tazoe, Yutaka Kaneko, Hiroyuki Ashizawa
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Publication number: 20030173826Abstract: A brake control apparatus is configured to suppress fluctuations in the deceleration when transferring from cooperative braking to regenerative braking or hydraulic braking. The brake control apparatus calculates a braking torque command value feed forward component for reaching a target deceleration corresponding to the master cylinder pressure according to an ideal reference model. The brake control apparatus also calculates the braking torque command value feedback component to find a base deceleration for feeding back the difference between the base deceleration and the vehicle deceleration. The brake control apparatus then calculates the braking torque command value by adding the components together.Type: ApplicationFiled: February 12, 2003Publication date: September 18, 2003Applicant: Nissan Motor Co., Ltd.Inventors: Kazuhiko Tazoe, Hideo Nakamura, Junji Tsutsumi, Hiroki Sasaki
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Publication number: 20030168266Abstract: A brake control apparatus is configured to keep a regenerative braking torque imparted to a wheel at an appropriate level and to prevent it from becoming excessive in a case where a regenerative braking force produced by a motor generator is imparted to a wheel via a transmission. When the transmission installed between the wheel and the motor generators is a continuously variable transmission, a regenerative braking torque limit value is set such that it becomes smaller when a gear ratio of the continuously variable transmission becomes larger. For a given regenerative braking torque of the motor generators, the regenerative braking torque imparted to the wheels is larger when the gear ratio is larger. Consequently, the regenerative braking torque limit value is set such that the larger the gear ratio is, the smaller the regenerative braking torque limit value is.Type: ApplicationFiled: February 19, 2003Publication date: September 11, 2003Applicant: Nissan Motor Co., Ltd.Inventors: Hiroki Sasaki, Hideo Nakamura, Junji Tsutsumi, Kazuhiko Tazoe
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Publication number: 20030062770Abstract: A brake control apparatus for a vehicle includes an actuating section to apply a regenerative braking force to a motor-driven wheel driven by a motor of the vehicle. A control section is arranged to vary the regenerative braking force in a direction to shift a front and rear wheel braking force distribution toward an ideal braking force distribution, in accordance with a wheel locking tendency of the motor-driven wheel when the regenerative braking force exceeding a braking force determined by the ideal braking force distribution is applied to the motor-driven wheel.Type: ApplicationFiled: September 26, 2002Publication date: April 3, 2003Applicant: NISSAN MOTOR CO., LTD.Inventors: Hiroki Sasaki, Hideo Nakamura, Junji Tsutsumi, Kazuhiko Tazoe, Hidetoshi Suzuki