Patents by Inventor Tomoaki Fujibayashi
Tomoaki Fujibayashi 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: 11878733Abstract: A steering control device according to the present invention is configured to obtain information on a parking position of a vehicle obtained by an external world recognition unit, and to output, based on the obtained information on the parking position, an instruction for moving a rear portion of the vehicle to a set position in a parking width direction to a rear-wheel steering device configured to control a steered angle of rear wheels of the vehicle. With this configuration, even when a timing or an angle for operating a steering wheel by a driver is not appropriate, or even when a steered angle of front wheels is limited, parking of the vehicle at the predetermined position in the parking width direction is facilitated.Type: GrantFiled: July 3, 2019Date of Patent: January 23, 2024Assignee: Hitachi Astemo, Ltd.Inventors: Hiroshi Nakano, Tomoaki Fujibayashi, Kazuya Takahashi
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Patent number: 11858574Abstract: Provided is a steering control device and a steering control method that can suppress the deterioration of the turning responsiveness at the initial stage of steering that may occur in a four-wheel steering vehicle and improve the steering stability when the front and rear wheels of the four-wheel steering vehicle are controlled in the same phase. A steering control device 1 of a vehicle that controls a rear wheel steering angle based on a front wheel steering angle includes a control unit 19 that controls an amount obtained by dividing an integrated value of a change in the rear wheel steering angle in a second steering section where an absolute value of the front wheel steering angle is constant and/or decreases by a time to be larger than an amount obtained by dividing an integrated value of a change in the rear wheel steering angle in a first steering section where the absolute value of the front wheel steering angle increases by a time.Type: GrantFiled: March 1, 2019Date of Patent: January 2, 2024Assignee: Hitachi Astemo, Ltd.Inventors: Go Sakayori, Junya Takahashi, Hiroshi Nakano, Tomoaki Fujibayashi
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Publication number: 20230347972Abstract: The present disclosure provides a steering control device capable of transmitting an appropriate reaction force by a driver via a steering wheel and improving the stability of a vehicle. Provided is a steering control device 100 for controlling a reaction force actuator 16 that generates a reaction force against an operation of a driver in a steering wheel 13 of a vehicle 10. The steering control device 100 increases the reaction force in a nonlinear region where a cornering force characteristic that is the relationship between the slip angle and the lateral force of tires 11 of the vehicle 10 becomes nonlinear, more than the reaction force in a linear region where the cornering force characteristic becomes linear.Type: ApplicationFiled: December 8, 2020Publication date: November 2, 2023Inventors: Go SAKAYORI, Kenta MAEDA, Tomoaki FUJIBAYASHI, Hiroki SONODA
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Publication number: 20230339534Abstract: A steering device according to the present invention includes: a steering input device including a reaction force actuator that applies a steering reaction force to a steering operation input member; and a control device including a steering gear ratio change unit that changes a steering gear ratio in accordance with a vehicle speed, a reaction force actuator control unit that controls an output amount of the reaction force actuator in accordance with an operation angular velocity of the steering operation input member, and a reaction force actuator output amount change unit that changes, based on the steering gear ratio, the output amount of the reaction force actuator. This makes it possible to set an appropriate steering reaction force applied to the steering operation input member, thereby stably reducing the operational burden on a driver.Type: ApplicationFiled: September 2, 2021Publication date: October 26, 2023Applicant: HITACHI ASTEMO, LTD.Inventors: Hiroki SONODA, Yoshiji HASEGAWA, Tomoaki FUJIBAYASHI
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Publication number: 20220340195Abstract: An object of the present invention is to provide a steering control device and a steering control method that can reduce a driving burden imposed on a driver during low velocity driving. The present invention is provided with an arithmetic logic unit that changes a steering angle of a wheel 11 by driving a wheel steering actuator 7 based on a manipulated variable of a steering 3, and calculates a controlled variable of the wheel steering actuator 7. In turning the steering 3, the arithmetic logic unit controls the wheel steering actuator 7 based on a first gain at which a ratio of an actual steering angle of the wheel 11 changes with respect to a steering angle ?, and in returning the steering 3, the arithmetic logic unit controls the wheel steering actuator 7 based on a second gain that differs from the first gain.Type: ApplicationFiled: September 10, 2020Publication date: October 27, 2022Applicant: Hitachi Astemo, Ltd.Inventors: Go SAKAYORI, Tomoaki FUJIBAYASHI, Hiroki SONODA
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Publication number: 20220332366Abstract: A steering control device, a steering control method, and a steering control system according to the present invention determines a rear wheel steering angle control command for returning a rear wheel steering angle to a predetermined steering angle earlier than a front wheel steering angle when steering wheel operation (that is, operation of a steering wheel) shifts from a state of additional turning to a state of cutback turning, in steering control that steers a rear wheel steering angle of a vehicle in opposite-phase with respect to a front wheel steering angle, and outputs the determined rear wheel steering angle control command to a rear wheel steering device, so that hysteresis of a yaw rate is reduced or eliminated, reducing or eliminating a sense of discomfort given to a driver.Type: ApplicationFiled: May 20, 2020Publication date: October 20, 2022Inventors: Hiroki SONODA, Tomoaki FUJIBAYASHI, Yoshiji HASEGAWA, Kazuya Takahashi, Toshihiko KANEDA
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Publication number: 20220073133Abstract: A steering control device for reducing a steering load on the driver by adjusting a gain of a rear wheel steering angle with respect to a front wheel steering angle operated by the driver according to a relative relationship between the vehicle and the parking frame to enable fine steering of the own vehicle near the parking frame when the four-wheel steering vehicle is parked. The steering control device is configured to control a rear wheel steering angle by a rear wheel steering system based on a front wheel steering angle operated by a driver, and includes an arithmetic device configured to reduce an absolute value of a gain of the rear wheel steering angle with respect to the front wheel steering angle as a positional relationship between an own vehicle and a parking frame comes closer when an own vehicle shifts to a parking driving mode.Type: ApplicationFiled: August 22, 2019Publication date: March 10, 2022Applicant: Hitachi Astemo, Ltd.Inventors: Go SAKAYORI, Hiroshi NAKANO, Yoshiji HASEGAWA, Tomoaki FUJIBAYASHI, Junya TAKAHASHI
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Publication number: 20220001921Abstract: In a steering control device, method, and system, a command is calculated for generating a periodical yaw moment having a phase opposite to oscillating motion based on information on oscillating motion which occurs in a vehicle combination composed of a vehicle and a trailer, and based on the calculated command, a first steering angle command for controlling a steering angle of the front wheels of the vehicle is output to a front wheel steering control unit and a second steering angle command for controlling a steering angle of the rear wheels of the vehicle is output to a rear wheel steering control unit, so that the oscillating motion can be suppressed.Type: ApplicationFiled: October 30, 2019Publication date: January 6, 2022Inventors: Hiroshi NAKANO, Tomoaki FUJIBAYASHI, Kazuya TAKAHASHI
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Publication number: 20210362782Abstract: Provided is a steering control device and a steering control method that can suppress the deterioration of the turning responsiveness at the initial stage of steering that may occur in a four-wheel steering vehicle and improve the steering stability when the front and rear wheels of the four-wheel steering vehicle are controlled in the same phase. A steering control device 1 of a vehicle that controls a rear wheel steering angle based on a front wheel steering angle includes a control unit 19 that controls an amount obtained by dividing an integrated value of a change in the rear wheel steering angle in a second steering section where an absolute value of the front wheel steering angle is constant and/or decreases by a time to be larger than an amount obtained by dividing an integrated value of a change in the rear wheel steering angle in a first steering section where the absolute value of the front wheel steering angle increases by a time.Type: ApplicationFiled: March 1, 2019Publication date: November 25, 2021Applicant: Hitachi Automotive Systems, Ltd.Inventors: Go SAKAYORI, Junya TAKAHASHI, Hiroshi NAKANO, Tomoaki FUJIBAYASHI
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Publication number: 20210347409Abstract: A steering control apparatus, a steering control method, and a steering control system according to the present invention output an instruction for generating a periodic yaw moment opposite in phase from an rolling motion occurring on a hitch vehicle including a vehicle and a trailer to a rear-wheel steering apparatus configured to control a steering angle of a rear wheel of the vehicle.Type: ApplicationFiled: August 2, 2019Publication date: November 11, 2021Inventors: Hiroshi NAKANO, Tomoaki FUJIBAYASHI, Kazuya TAKAHASHI
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Publication number: 20210269094Abstract: A steering control device according to the present invention is configured to obtain information on a parking position of a vehicle obtained by an external world recognition unit, and to output, based on the obtained information on the parking position, an instruction for moving a rear portion of the vehicle to a set position in a parking width direction to a rear-wheel steering device configured to control a steered angle of rear wheels of the vehicle. With this configuration, even when a timing or an angle for operating a steering wheel by a driver is not appropriate, or even when a steered angle of front wheels is limited, parking of the vehicle at the predetermined position in the parking width direction is facilitated.Type: ApplicationFiled: July 3, 2019Publication date: September 2, 2021Inventors: Hiroshi NAKANO, Tomoaki FUJIBAYASHI, Kazuya TAKAHASHI
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Publication number: 20210214004Abstract: An object of the present invention is to estimate a center-of-gravity position and inertia moment of a trailer and supply the center-of-gravity position and inertia moment for control of an articulated vehicle so as to enable further stabilization of a posture of the articulated vehicle during traveling. A vehicle control device of the present invention is a vehicle control device mounted on a tractor which pulls a trailer, and is provided with: a steering angle control unit that controls a steering angle of wheels of the tractor independently of steering by a driver; and a trailer characteristic estimation unit that estimates a characteristic of the trailer based on a behavior of the tractor during wheel steering by the steering angle control unit.Type: ApplicationFiled: February 21, 2019Publication date: July 15, 2021Applicant: Hitachi Automotive Systems, Ltd.Inventors: Shinji SETO, Junya TAKAHASHI, Tomoaki FUJIBAYASHI, Hiroshi NAKANO
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Patent number: 8374761Abstract: A driving force distribution control device for a four wheel drive vehicle having a mechanism that distributes the torque of an engine, which is transmitted to a main drive wheel, to a secondary drive wheel determines a first torque to be distributed to the secondary drive wheel on the basis of the engine torque, and corrects the determined first torque on the basis of a yaw rate deviation between a target yaw rate and an actual yaw rate of the vehicle. When an absolute value of the yaw rate deviation is equal to or greater than a predetermined value, the mechanism is controlled on the basis of the corrected torque.Type: GrantFiled: August 5, 2008Date of Patent: February 12, 2013Assignees: Nissan Motor Co., Ltd., Hitachi, Ltd.Inventors: Yoshiyuki Fukuda, Tomoaki Fujibayashi, Hideyuki Arai
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Publication number: 20090043469Abstract: A driving force distribution control device for a four wheel drive vehicle having a mechanism that distributes the torque of an engine, which is transmitted to a main drive wheel, to a secondary drive wheel determines a first torque to be distributed to the secondary drive wheel on the basis of the engine torque, and corrects the determined first torque on the basis of a yaw rate deviation between a target yaw rate and an actual yaw rate of the vehicle. When an absolute value of the yaw rate deviation is equal to or greater than a predetermined value, the mechanism is controlled on the basis of the corrected torque.Type: ApplicationFiled: August 5, 2008Publication date: February 12, 2009Inventors: Yoshiyuki FUKUDA, Hideyuki Arai, Tomoaki Fujibayashi
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Patent number: 7000998Abstract: A brake control apparatus includes a vehicle sensor to sense a vehicle condition, and a control unit to start a hill hold control to hold a vehicle in a stop state by a braking force produced by a brake actuator even after an end of the driver's braking operation, in accordance with a hill hold control start adjustment parameter determined from the sensed vehicle condition. The parameter may be a variable indicative of a gradient of a road.Type: GrantFiled: January 16, 2003Date of Patent: February 21, 2006Assignee: HItachi, Ltd.Inventors: Sunao Hano, Tomoaki Fujibayashi, Masahiro Nakamizo
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Publication number: 20030137192Abstract: A brake control apparatus includes a vehicle sensor to sense a vehicle condition, and a control unit to start a hill hold control to hold a vehicle in a stop state by a braking force produced by a brake actuator even after an end of the driver's braking operation, in accordance with a hill hold control start adjustment parameter determined from the sensed vehicle condition. The parameter may be a variable indicative of a gradient of a road.Type: ApplicationFiled: January 16, 2003Publication date: July 24, 2003Applicant: HITACHI UNISIA AUTOMOTIVE, LTD.Inventors: Sunao Hano, Tomoaki Fujibayashi, Masahiro Nakamizo