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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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公开(公告)号：US20230227017A1
公开(公告)日：2023-07-20
申请号：US17928793
申请日：2021-05-13
申请人： Hitachi Astemo, Ltd.
CPC分类号： B60T13/74 , H02P29/40 , B60T13/662
摘要： Accurately controlling pressing thrust regardless of an individual difference and a use situation of a brake apparatus, and the like are set forth herein. The present invention controls a motor that applies thrust to a piston that presses a brake pad, in a current variation period before an idling current period, a variation in the current and the voltage or a variation in a function including the current and the voltage in the idling current period is computed as a plurality of prospective values. At a predetermined time T0 during the current variation period, one of the plurality of prospective values is selected on the basis of the current and the voltage, and on the basis of the variation in the current and the voltage or the function related to the selected prospective value, a characteristic parameter of the motor is computed to compute a stop current of the motor.
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公开(公告)号：US20230043134A1
公开(公告)日：2023-02-09
申请号：US17790570
申请日：2020-10-22
申请人： Hitachi Astemo, Ltd.
发明人： Shinji SETO , Shunsuke ARITOMI , Ryu KAI , Kimio NISHINO , Daisuke KOJIMA
摘要： Provided fire an electric parking brake device and an electric parking brake control method that can apply an appropriate clamping force by accelerating data measurement and by suppressing influence of load fluctuation during idle rum For this end, the electric parking brake device of the present invention includes: a disc rotor; brake pads that are pressed to the disc rotor; an electric motor that imparts a thrust to the brake pads; a current detection unit that detects a motor current of the electric motor; and a brake control device that controls the electric motor 8 based on the motor current. The brake control device controls the electric motor 8 based on a current change amount of an electric current during a period from a point of time that the motor current becomes a peak current to a predetermined point of time.
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公开(公告)号：US20230038318A1
公开(公告)日：2023-02-09
申请号：US17790367
申请日：2020-12-25
申请人： Hitachi Astemo, Ltd.
发明人： Toshihiro AONO , Osamu MUKAIHARA , Kenichiro TOKUO , Hirotaka NAKAI , Kotaro OKI , Shunsuke ARITOMI , Akiyasu MIYAMOTO
摘要： Low noise control of a high-pressure fuel pump is performed by reducing noise generated by an anchor colliding with a fixing core. A control device 800 for a high-pressure fuel pump controls a suction valve that opens and closes an inflow port through which fuel flows to a pressurizing chamber by performing energization to a solenoid 205 in synchronization with a reciprocating motion of a plunger. A current energized to the solenoid 205 includes a peak current for giving a force to start closing a valve to the suction valve in a stationary state and a holding current for performing switching in a range smaller a maximum value of the peak current in order to hold the suction valve in a valve closing state. When the control device 800 reduces a peak current application amount of the peak current from a value sufficient to close the high-pressure fuel pump, a valve closing speed of the suction valve becomes small up to a certain application amount, and when the peak current application amount becomes smaller than the application amount, there is a saturation range of a current application amount of the peak current in which the valve closing speed of the suction valve is saturated. The control device 800 controls the current application amount of the peak current to fall in the saturation range.
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