Patents by Inventor Naoki HIRAGA
Naoki HIRAGA 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: 11447112Abstract: Disclosed is a vehicle attitude control system for controlling the attitude of a vehicle in which a road wheel suspension is configured such that a roll axis of a vehicle body inclines downwardly in a forward direction. The vehicle attitude control system includes: a lateral acceleration sensor operable to detect a lateral acceleration; a brake actuator operable to apply a braking force; and a brake control device operable, based on a traveling state of the vehicle, to generate the braking force, wherein the brake control device is configured to execute vehicle attitude control of applying, to an inner rear road wheel, a larger braking force when the lateral acceleration of the vehicle is relatively large than when the lateral acceleration is relatively small, thereby suppressing uplift of an inner rear portion of the vehicle body.Type: GrantFiled: May 22, 2020Date of Patent: September 20, 2022Assignee: Mazda Motor CorporationInventors: Naoki Hiraga, Daisuke Umetsu, Fuminori Kato, Hiroyuki Ogata
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Patent number: 11383698Abstract: Provided are: a device and a method for controlling vehicle movement, with which it is possible to suppress causing uncomfortableness to vehicle occupants and causing unstable behavior during turning by automatic travel control; and a device and a method for generating a target course. In a vehicle capable of automatically controlling lateral acceleration occurring in the vehicle, the present invention controls the acceleration occurring in the vehicle such that jerk, which is the change over time of acceleration, becomes the greatest in a region where the lateral acceleration that occurs upon entering a curve is equal to or less than half the acceleration during normal turning, and the jerk decreases as the acceleration increases.Type: GrantFiled: July 26, 2018Date of Patent: July 12, 2022Assignee: HITACHI ASTEMO, LTD.Inventors: Junya Takahashi, Yuki Akiyama, Kenta Maeda, Naoki Hiraga, Toshiyuki Innami
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Patent number: 11273810Abstract: The present invention provides a vehicle control device that can reduce the delay in the deceleration response of a vehicle to a deceleration command. The present invention modifies the distribution ratio of brake fluid pressure between front brakes and rear brakes on the basis of lateral motion information, vehicle information, and a collision risk or a traveling scene obtained from information pertaining to the external surroundings. The brake fluid pressure is distributed to only one of the front brakes or the rear brakes.Type: GrantFiled: June 2, 2017Date of Patent: March 15, 2022Assignee: HITACHI ASTEMO, LTD.Inventors: Naoki Hiraga, Toshiyuki Innami, Junya Takahashi, Seiichi Satoh
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Publication number: 20200384967Abstract: Disclosed is a vehicle attitude control system for controlling the attitude of a vehicle in which a road wheel suspension is configured such that a roll axis of a vehicle body inclines downwardly in a forward direction. The vehicle attitude control system includes: a lateral acceleration sensor operable to detect a lateral acceleration; a brake actuator operable to apply a braking force; and a brake control device operable, based on a traveling state of the vehicle, to generate the braking force, wherein the brake control device is configured to execute vehicle attitude control of applying, to an inner rear road wheel, a larger braking force when the lateral acceleration of the vehicle is relatively large than when the lateral acceleration is relatively small, thereby suppressing uplift of an inner rear portion of the vehicle body.Type: ApplicationFiled: May 22, 2020Publication date: December 10, 2020Inventors: Naoki HIRAGA, Daisuke UMETSU, Fuminori KATO, Hiroyuki OGATA
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Publication number: 20200384979Abstract: The vehicle attitude control system for controlling the attitude of a vehicle in which a road wheel suspension is configured such that a roll axis of the vehicle inclines downwardly in a forward direction. The vehicle attitude control system includes: a road wheel speed sensor operable to detect a road wheel speed; a brake actuator operable to apply a braking force to each road wheel of the vehicle; and a brake control device operable to cause the brake actuator to generate the braking force, based on a detection signal of the road wheel speed sensor, wherein the brake control device executes vehicle attitude control of applying a first braking force to the inner rear road wheel, based on a difference in road wheel speed between an inner and an outer rear road wheels of the vehicle being turning, during turning of the vehicle.Type: ApplicationFiled: May 22, 2020Publication date: December 10, 2020Inventors: Naoki HIRAGA, Daisuke UMETSU, Fuminori KATO, Hiroyuki OGATA
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Publication number: 20200324748Abstract: The present invention provides a vehicle control device that can reduce the delay in the deceleration response of a vehicle to a deceleration command. The present invention modifies the distribution ratio of brake fluid pressure between front brakes and rear brakes on the basis of lateral motion information, vehicle information, and a collision risk or a traveling scene obtained from information pertaining to the external surroundings. The brake fluid pressure is distributed to only one of the front brakes or the rear brakes.Type: ApplicationFiled: June 2, 2017Publication date: October 15, 2020Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Naoki HIRAGA, Toshiyuki INNAMI, Junya TAKAHASHI, Seiichi SATOH
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Publication number: 20200216046Abstract: Provided is a vehicle control device that can reduce an uncomfortable feeling imparted to the driver when yaw-moment control is executed. In accordance with the output of a computation unit that instructs a yaw moment, the vehicle control device changes the distribution ratio between the braking force imparted to the front wheels and the braking force imparted to the rear wheels.Type: ApplicationFiled: July 18, 2018Publication date: July 9, 2020Applicant: Hitachi Automotive Systems, Ltd.Inventors: Naoki HIRAGA, Seiichi SATOH, Toshiyuki INNAMI, Junya TAKAHASHI
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Publication number: 20200164870Abstract: Provided are: a device and a method for controlling vehicle movement, with which it is possible to suppress causing uncomfortableness to vehicle occupants and causing unstable behavior during turning by automatic travel control; and a device and a method for generating a target course. In a vehicle capable of automatically controlling lateral acceleration occurring in the vehicle, the present invention controls the acceleration occurring in the vehicle such that jerk, which is the change over time of acceleration, becomes the greatest in a region where the lateral acceleration that occurs upon entering a curve is equal to or less than half the acceleration during normal turning, and the jerk decreases as the acceleration increases.Type: ApplicationFiled: July 26, 2018Publication date: May 28, 2020Applicant: Hitachi Automotive Systems, Ltd.Inventors: Junya TAKAHASHI, Yuki AKIYAMA, Kenta MAEDA, Naoki HIRAGA, Toshiyuki INNAMI
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Publication number: 20200117192Abstract: The present invention provides a travel control device for a vehicle with which it is possible to control the vehicle so that, by appropriately controlling override in accordance with the vehicle behavior upon driver override, the vehicle behavior does not become unstable. This travel control device comprises: a vehicle control plan creation unit that creates a control plan for a vehicle; an operation detail acquisition unit that acquires operation details by a driver to the vehicle; a vehicle control assessment unit that determines vehicle control details on the basis of the control plan and the driver's operation details; a vehicle behavior assessment unit that assesses the behavior of the vehicle; and a vehicle control detail determination unit that determines whether or not to prioritize the driver's operation details over the vehicle control plan on the basis of the behavior of the vehicle as assessed by the vehicle behavior assessment unit.Type: ApplicationFiled: June 4, 2018Publication date: April 16, 2020Inventors: Seiichi SATOH, Toshiyuki INNAMI, Naoki HIRAGA, Junya TAKAHASHI, Yuki AKIYAMA
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Publication number: 20200086885Abstract: According to the present invention, even when information needed to calculate an acceleration command cannot be detected due to a sensor malfunction or the like, acceleration control can be continued by adding, in accordance with outside-world information, a correction to the result of calculating the acceleration command, which uses the result of an estimation made using alternative sensor information.Type: ApplicationFiled: May 30, 2018Publication date: March 19, 2020Inventors: Naoki HIRAGA, Toshiyuki INNAMI, Junya TAKAHASHI, Yuki AKIYAMA, Seiichi SATOH