Patents by Inventor Ryota Shirato
Ryota Shirato 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: 8423277Abstract: A vehicle controller selects a collision avoidance route corresponding to steering of a vehicle by a driver, to control the vehicle so that the vehicle runs based on the selected collision avoidance route. Accordingly, it can be prevented that a vehicle operation being performed by the driver is disturbed, in other words, a reaction of the driver is disturbed by collision avoidance control and the driver feels discomfort with respect to the collision avoidance control.Type: GrantFiled: April 17, 2008Date of Patent: April 16, 2013Assignee: Nissan Motor Co., Ltd.Inventor: Ryota Shirato
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Patent number: 7753162Abstract: A vehicle steering apparatus includes a vehicle steering system and a supplemental steering force applying device. The supplemental steering force applying device is configured and arranged to apply a supplemental steering force to the vehicle steering system to reduce a steering load on the operator. The supplemental steering force applying device includes a steering torque detecting section, a rectilinear driving condition detecting section, a pulling suppression control section. The rectilinear driving condition detecting section is configured and arranged to detect a rectilinear driving condition of the vehicle. The pulling suppression control section is configured and arranged to adjust the supplemental steering force in a direction canceling a pulling force imparted on the vehicle during the rectilinear driving condition by using a pulling suppression force calculated based on historical data of the steering torque detected during the rectilinear driving condition.Type: GrantFiled: July 25, 2006Date of Patent: July 13, 2010Assignee: Nissan Motor Co., Ltd.Inventors: Yuuki Shiozawa, Hiroshi Mouri, Masahiro Kubota, Ryota Shirato, Nami Nagae, Masayuki Watanabe
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Patent number: 7551996Abstract: A vehicle motion control device is configured to determine whether the lane in which the vehicle is traveling is straight or curved. If the road is curved, a target yaw rate is set such that the yaw rate of the vehicle to the target position is averaged. If the road is straight, the target yaw rate is set such that the response delay does not exceed a target value. Therefore, wavering of the vehicle with respect to the lane is suppressed, and the vehicle is controlled to move smoothly when the road is curved and briskly when the road is straight. When the road switches between a curved road and a straight road, the target yaw rate is gradually changed between a target yaw rate calculated for a curved road and a target yaw rate calculated for a straight road.Type: GrantFiled: July 12, 2005Date of Patent: June 23, 2009Assignee: Nissan Motor Co., Ltd.Inventors: Ryota Shirato, Hiroshi Mouri
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Publication number: 20080281521Abstract: A vehicle controller selects a collision avoidance route corresponding to steering of a vehicle by a driver, to control the vehicle so that the vehicle runs based on the selected collision avoidance route. Accordingly, it can be prevented that a vehicle operation being performed by the driver is disturbed, in other words, a reaction of the driver is disturbed by collision avoidance control and the driver feels discomfort with respect to the collision avoidance control.Type: ApplicationFiled: April 17, 2008Publication date: November 13, 2008Inventor: Ryota Shirato
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Patent number: 7406373Abstract: An electric power steering system for an automotive vehicle, including a steering torque detecting device which detects a steering torque of a steering shaft. An electric motor is provided to generate an assist torque for assisting a driver's steering effort required for steering the vehicle and a counter-assist torque for increasing the driver's steering effort. The assist torque and the counter-assist torque are applied to a steering mechanism. Additionally, a controller is provided to output a drive command to the electric motor in accordance with the detected steering torque. The drive command is for causing the electric motor to generate the counter-assist torque when the detected steering torque is a transitional torque.Type: GrantFiled: November 4, 2004Date of Patent: July 29, 2008Assignee: Nissan Motor Co., Ltd.Inventors: Masahiro Kubota, Hiroshi Mouri, Tadashi Tamasho, Ryota Shirato, Takayuki Sonoda
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Patent number: 7266436Abstract: A lane-keep control system includes a traveling condition detector and a controller. The controller includes a steering intention detecting section that detects whether a driver has an intention to steer a vehicle, a first steering torque control section that controls, when the driver has no intention to steer the vehicle, a steering torque according to the traveling condition so that the vehicle keeps a predetermined position between lane markings of a lane, and a second steering torque control section that controls, when the driver has an intention to steer the vehicle, the steering torque according to the traveling condition so that a steering operation of the driver is readily reflected on steering of the vehicle. A lane-keep control method is also provided.Type: GrantFiled: April 21, 2005Date of Patent: September 4, 2007Assignee: Nissan Motor Co., Ltd.Inventors: Ryota Shirato, Hiroshi Mouri
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Publication number: 20070029129Abstract: A vehicle steering apparatus includes a vehicle steering system and a supplemental steering force applying device. The supplemental steering force applying device is configured and arranged to apply a supplemental steering force to the vehicle steering system to reduce a steering load on the operator. The supplemental steering force applying device includes a steering torque detecting section, a rectilinear driving condition detecting section, a pulling suppression control section. The rectilinear driving condition detecting section is configured and arranged to detect a rectilinear driving condition of the vehicle. The pulling suppression control section is configured and arranged to adjust the supplemental steering force in a direction canceling a pulling force imparted on the vehicle during the rectilinear driving condition by using a pulling suppression force calculated based on historical data of the steering torque detected during the rectilinear driving condition.Type: ApplicationFiled: July 25, 2006Publication date: February 8, 2007Applicant: Nissan Motor Co., Ltd.Inventors: Yuuki Shiozawa, Hiroshi Mouri, Masahiro Kubota, Ryota Shirato, Nami Nagae, Masayuki Watanabe
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Patent number: 7004280Abstract: In a multiplex power steering device for a wheeled vehicle, there is provided a control unit which includes a feedback computing part. The feedback computing part comprises an operating force estimating section that, by analyzing an output from a controlled system of actuators of a steering mechanism, estimates an output of the actuators, a disturbance estimating section that, by comparing a control signal actually fed to the actuators and the estimated output of the actuators, estimates a disturbance applied to the controlled system from the exterior, and a disturbance compensating section that adjusts the control signal in a manner to remove the estimated disturbance therefrom. The control unit calculates the control signal on the assumption that the actuators constitute a single actuator.Type: GrantFiled: November 21, 2003Date of Patent: February 28, 2006Assignee: Nissan Motor Co., Ltd.Inventors: Ryota Shirato, Hiroshi Mouri, Tadashi Tamasho, Masahiro Kubota, Takayuki Sonoda, Kiyotaka Shitamitsu
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Publication number: 20060041356Abstract: A vehicle motion control device is configured to determine whether the lane in which the vehicle is traveling is straight or curved. If the road is curved, a target yaw rate is set such that the yaw rate of the vehicle to the target position is averaged. If the road is straight, the target yaw rate is set such that the response delay does not exceed a target value. Therefore, wavering of the vehicle with respect to the lane is suppressed, and the vehicle is controlled to move smoothly when the road is curved and briskly when the road is straight. When the road switches between a curved road and a straight road, the target yaw rate is gradually changed between a target yaw rate calculated for a curved road and a target yaw rate calculated for a straight road.Type: ApplicationFiled: July 12, 2005Publication date: February 23, 2006Applicant: Nissan Motor Co., Ltd.Inventors: Ryota Shirato, Hiroshi Mouri
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Publication number: 20050240328Abstract: A lane-keep control system includes a traveling condition detector and a controller. The controller includes a steering intention detecting section that detects whether a driver has an intention to steer a vehicle, a first steering torque control section that controls, when the driver has an intention to steer the vehicle, a steering torque according to the traveling condition so that the vehicle keeps a predetermined position between lane markings of a lane, and a second steering torque control section that controls, when the driver has no intention to steer the vehicle, the steering torque according to the traveling condition so that a steering operation of the driver is readily reflected on steering of the vehicle. A lane-keep control method is also provided.Type: ApplicationFiled: April 21, 2005Publication date: October 27, 2005Inventors: Ryota Shirato, Hiroshi Mouri
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Publication number: 20050109556Abstract: An electric power steering system for an automotive vehicle, including a steering torque detecting device which detects a steering torque of a steering shaft. An electric motor is provided to generate an assist torque for assisting a driver's steering effort required for steering the vehicle and a counter-assist torque for increasing the driver's steering effort. The assist torque and the counter-assist torque are applied to a steering mechanism. Additionally, a controller is provided to output a drive command to the electric motor in accordance with the detected steering torque. The drive command is for causing the electric motor to generate the counter-assist torque when the detected steering torque is a transitional torque.Type: ApplicationFiled: November 4, 2004Publication date: May 26, 2005Inventors: Masahiro Kubota, Hiroshi Mouri, Tadashi Tamasho, Ryota Shirato, Takayuki Sonoda
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Patent number: 6850628Abstract: A lane recognition apparatus for a vehicle is comprised of a camera and a processor. The camera is installed to the vehicle and picks up a road image ahead of the vehicle. The processor is coupled to the camera. The processor is arranged to detect a plurality of lane marker candidate points from the road image, to calculate a road model parameter representative of a road shape ahead of the vehicle on the basis of the lane marker candidate points, to calculate a deviation between the lane marker candidate point and an estimated candidate point estimated from the road model parameter, and to determine whether the road image is employed for detecting the lane marker, on the basis of the deviation.Type: GrantFiled: October 22, 2001Date of Patent: February 1, 2005Assignee: Nissan Motor Co., Ltd.Inventor: Ryota Shirato
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Patent number: 6823241Abstract: A lane recognition apparatus for a vehicle is comprised of an image picking-up section which picks up a road image in front of the vehicle, a lane-marker candidate-point detecting section which detects coordinate values of a plurality of lane marker candidate points from the road image, and a road model parameter calculating section which estimates a road model parameter representative of a road shape in front of the vehicle and a vehicle state quantity of the vehicle using an extended Kalman filter, on the basis of the coordinate values of the lane marker candidate points.Type: GrantFiled: September 14, 2001Date of Patent: November 23, 2004Assignee: Nissan Motor Co., Ltd.Inventors: Ryota Shirato, Hiroshi Mouri
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Publication number: 20040118629Abstract: In a multiplex power steering device for a wheeled vehicle, there is provided a control unit which includes a feedback computing part. The feedback computing part comprises an operating force estimating section that, by analyzing an output from a controlled system of actuators of a steering mechanism, estimates an output of the actuators, a disturbance estimating section that, by comparing a control signal actually fed to the actuators and the estimated output of the actuators, estimates a disturbance applied to the controlled system from the exterior, and a disturbance compensating section that adjusts the control signal in a manner to remove the estimated disturbance therefrom. The control unit calculates the control signal on the assumption that the actuators constitute a single actuator.Type: ApplicationFiled: November 21, 2003Publication date: June 24, 2004Applicant: NISSAN MOTOR CO., LTD.Inventors: Ryota Shirato, Hiroshi Mouri, Tadashi Tamasho, Masahiro Kubota, Takayuki Sonoda, Kiyotaka Shitamitsu
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Publication number: 20020131620Abstract: A lane recognition apparatus for a vehicle is comprised of a camera and a processor. The camera is installed to the vehicle and picks up a road image ahead of the vehicle. The processor is coupled to the camera. The processor is arranged to detect a plurality of lane marker candidate points from the road image, to calculate a road model parameter representative of a road shape ahead of the vehicle on the basis of the lane marker candidate points, to calculate a deviation between the lane marker candidate point and an estimated candidate point estimated from the road model parameter, and to determine whether the road image is employed for detecting the lane marker, on the basis of the deviation.Type: ApplicationFiled: October 22, 2001Publication date: September 19, 2002Applicant: NISSAN MOTOR CO., LTD.Inventor: Ryota Shirato
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Publication number: 20020042668Abstract: A lane recognition apparatus for a vehicle is comprised of an image picking-up section which picks up a road image in front of the vehicle, a lane-marker candidate-point detecting section which detects coordinate values of a plurality of lane marker candidate points from the road image, and a road model parameter calculating section which estimates a road model parameter representative of a road shape in front of the vehicle and a vehicle state quantity of the vehicle using an extended Kalman filter, on the basis of the coordinate values of the lane marker candidate points.Type: ApplicationFiled: September 14, 2001Publication date: April 11, 2002Applicant: NISSAN MOTOR CO., LTD.Inventors: Ryota Shirato, Hiroshi Mouri