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公开(公告)号：US20240262417A1
公开(公告)日：2024-08-08
申请号：US18569385
申请日：2022-05-10
申请人： Hitachi Astemo, Ltd.
发明人： Chung Kim TANG , Kenta MAEDA , Huajun LIU , Atsushi HIRATA , Yasuhito NAKAKUKI
IPC分类号： B62D6/00
CPC分类号： B62D6/008
摘要： A control device method for steer by wire, the control device including a first motor controlling steering via an FBA and a second motor controlling a steering angle of a wheel via an RWA and being capable of bidirectionally controlling the first motor and the second motor includes a base SAT that obtains a reference torque based on an angle of the first motor and a vehicle speed, and a rack force estimation portion that estimates rack force as a reaction force based on a steering angle of a wheel and an RWA. A first control mode controls a reference torque of the first motor and a second control mode controls the first motor based on a reaction force estimation by the rack force estimation portion, the first and second control modes are switched based on output of the base SAT and output of the rack force estimation portion.
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公开(公告)号：US20230059965A1
公开(公告)日：2023-02-23
申请号：US17797508
申请日：2021-02-03
申请人： HITACHI ASTEMO, LTD.
发明人： Yasuhito NAKAKUKI , Makoto KIMURA , Huajun LIU , Atsushi HIRATA
IPC分类号： B62D5/00 , B62D15/02 , H02K11/215 , H02K7/108
摘要： A steering input device for steer-by-wire, according to the present invention, includes a steering shaft that is mechanically separated from a steered wheel, a reaction force motor that applies a steering load to the steering shaft, a lock mechanism that regulates rotation of the steering shaft, a steering amount sensor that detects an operation amount of the steering shaft and outputs an operation amount signal, and a controller. The controller increases the reaction torque generated by the reaction force motor after the starting switch of the vehicle is switched to an OFF state, and after the reaction torque is increased, switches the lock mechanism to a locked state. Thereby, it is possible to suppress an uncomfortable sensation of the driver in steering, while suppressing occurrence of a phase shift between the steering wheel and the steered wheel when the starting switch of the vehicle is switched to the OFF state.
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公开(公告)号：US20240308579A1
公开(公告)日：2024-09-19
申请号：US18576135
申请日：2022-06-01
申请人： Hitachi Astemo, Ltd.
发明人： Shunsuke ARITOMI , Tadaharu YOKOTA , Yasuhito NAKAKUKI , Atsushi HIRATA , Takahiro ITO , Kenta MAEDA
CPC分类号： B62D6/008 , B62D5/001 , B62D5/0409 , B62D5/0421 , B62D5/046
摘要： A steer-by-wire control device according to the present invention includes a control device that controls a first motor that operates a steering wheel of a vehicle and a second motor that controls steering operation of a wheel. Before making a transition to an automatic driving mode of the vehicle, the control device applies input torque to the steering wheel by the first motor in a forward rotation direction and a backward rotation direction of rotation directions of the first motor, acquires behavior information of the steering wheel obtained by application of the input torque, and determines whether or not to estimate a control parameter of the steering wheel based on the behavior information. The behavior information includes at least one of a value of a rotation angle of a steering wheel and a value obtained by time-differentiating a rotation angle.
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4.发明公开公开(公告)号：US20240278824A1
公开(公告)日：2024-08-22
申请号：US18569552
申请日：2022-06-01
申请人： HITACHI ASTEMO, LTD.
发明人： Huajun LIU , Yasuhito NAKAKUKI
CPC分类号： B62D5/0463 , B62D5/006 , B62D6/008
摘要： In one mode of a steer-by-wire system, a steer-by-wire control apparatus, and a steer-by-wire control method according to the present invention, when a vehicle is undergoing skid, a reaction force generation apparatus decreases or increases reaction force torque from basic reaction force torque calculated from a steering angle of a steering wheel, based on the steering angle, a vehicle speed of the vehicle, and motor torque of a turning motor, and outputs the calculated reaction force torque as skid reaction force torque. In this way, the driver can be appropriately notified of a vehicle skid state via the steering wheel.
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公开(公告)号：US20240025475A1
公开(公告)日：2024-01-25
申请号：US18044452
申请日：2021-09-06
申请人： HITACHI ASTEMO, LTD.
CPC分类号： B62D6/008 , B62D15/0235
摘要： A steer-by-wire steering apparatus according to the present invention includes: a reaction force actuator control section that controls an output amount of a reaction force actuator; a steering actuator control section that controls a steering actuator in response to a manipulation of a steering operation input member, the steering actuator steering steered wheels via a steering unit; a deviation recognition section that recognizes a deviation between a manipulation amount of the steering operation input member and a steering amount of the steering unit; and a reaction force actuator output boost section that, when the deviation increases, increases the output amount of the reaction force actuator. Thus, the steering reaction force can be appropriately controlled in correspondence with a response delay in the steering amount of the steering unit with respect to the manipulation amount of the steering operation input member.
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公开(公告)号：US20220001916A1
公开(公告)日：2022-01-06
申请号：US17291336
申请日：2019-10-29
申请人： Hitachi Astemo, Ltd.
发明人： Makoto KIMURA , Yasuhito NAKAKUKI , Kohtaro SHIINO
摘要： A steering apparatus includes a first CAN communication line provided between a steering input mechanism and a steering mechanism controller and configured to output a first steering operation amount signal output from a first steering operation amount signal output portion to the steering mechanism controller, and a communication line provided between the steering input mechanism and the steering mechanism controller and configured to output a second steering operation amount signal to the steering mechanism controller without intervention of a first microprocessor.
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