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公开(公告)号：US20220289285A1
公开(公告)日：2022-09-15
申请号：US17632379
申请日：2020-08-06
Applicant: Nidec Corporation
Inventor： Shuji ENDO , Hiroyuki ISHIMURA
Abstract: A control device obtains a post-code extension steering torque by performing moving average processing of weighting an oversampling signal obtained by oversampling processing, obtains a base assist torque based on the post-code extension steering torque signal, acquires a base assist torque signal that decreases the base assist torque as a vehicle speed increases, performs stabilization processing on the base assist torque signal to obtain an assist torque signal according to the assist torque of an electric power steering device.
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公开(公告)号：US20220289274A1
公开(公告)日：2022-09-15
申请号：US17632325
申请日：2020-08-06
Applicant: Nidec Corporation
Inventor： Shuji ENDO , Hiroyuki ISHIMURA , Hiroki MORITA
Abstract: A control device includes a processor and a memory that stores a program controlling an operation of the processor to cause the processor to acquire a steering torque, a vehicle speed, a steering angle, and a rotational speed of a motor, generate a base assist torque based on the steering torque and the vehicle speed, generate a self-aligning torque compensation torque based on the steering torque, the vehicle speed, the rotational speed of the motor, and the base assist torque, generate an active return torque based on the vehicle speed and the steering angle, generate a motor loss torque compensation torque based on the rotational speed of the motor, and generate a torque command value to be used to control driving of the motor.
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公开(公告)号：US20220266894A1
公开(公告)日：2022-08-25
申请号：US17632836
申请日：2020-08-06
Applicant: Nidec Corporation , NIDEC ELESYS CORPORATION
Inventor： Shuji ENDO , Hiroyuki ISHIMURA
Abstract: A processor acquires a steering torque detected by a steering torque sensor and a vehicle speed detected by a vehicle speed sensor, changes a gain and a phase to be applied to the steering torque in accordance with a steering frequency when a driver steers a steering wheel, determines a magnitude of an assist torque based on the steering torque to which the gain and the phase have been applied and the vehicle speed, and generates a torque command value to be used to control driving of the motor based on the determined assist torque.
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公开(公告)号：US20220209696A1
公开(公告)日：2022-06-30
申请号：US17562213
申请日：2021-12-27
Applicant: Nidec Corporation
Inventor： Hiroaki MIZUSHIMA , Shuji ENDO
IPC: H02P21/22
Abstract: A motor control device includes a controller to control a three-phase current by feeding back a control current value obtained based on the three-phase current. The controller is configured or programmed to execute first feedback control of feeding back any one of a first control current value calculated based on a second phase current and the third phase current, a second control current value calculated based on the third phase current and a first phase current, and a third control current value calculated based on the first phase current and the second phase current as a control current value and second feedback control in which the first control current value, the second control current value, and the third control current value are switched and fed back as the control current value.
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15.发明申请公开(公告)号：US20210276612A1
公开(公告)日：2021-09-09
申请号：US17192887
申请日：2021-03-05
Applicant: NIDEC CORPORATION , NIDEC ELESYS CORPORATION
Inventor： Shuji ENDO , Hiroyuki ISHIMURA
IPC: B62D5/04
Abstract: Both responsiveness and stability of a power assist control system are satisfied. A processor executes, in accordance with a program, determining base assist gain based on steering torque and base assist torque, generating stabilizing compensation torque based on the base assist torque, with use of a stabilizing compensator that has a second-order or higher transfer function in which a frequency characteristic is variable in accordance with the base assist gain and which is expressed using a responsiveness parameter ω and a damping parameter ζ, and generating a current command value for use in control of the motor based on the stabilizing compensation torque.
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Patent Agency Ranking
公开(公告)号：US20210044234A1
公开(公告)日：2021-02-11
申请号：US16968161
申请日：2019-02-08
Applicant: NIDEC CORPORATION , NIDEC ELESYS CORPORATION
Inventor： Shuji ENDO , Tokuji TATEWAKI , Tomoya UEDA , Masanori WATAHIKI , Tomonari MORI
Abstract: A motor control system includes an inverter, and a control unit that feedback-controls the inverter. The control unit includes a voltage control unit that calculates a voltage command value indicating a voltage to be applied to the motor from the inverter based on a current deviation between a current command value and an actual current detection value, and a torque ripple compensation unit that adds a compensation value for compensating a torque ripple in the motor to a signal value on at least one of an upstream side and a downstream side in a signal flow passing through the voltage control unit. The torque ripple compensation unit calculates the compensation value based on an actual angular velocity at which the motor rotates and the target current command value, and based on advance angle control for compensating a response delay of the motor control system with respect to the compensation value.
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公开(公告)号：US20250002076A1
公开(公告)日：2025-01-02
申请号：US18754621
申请日：2024-06-26
Applicant: NIDEC CORPORATION
Inventor： Shuji ENDO , Sohei MIYAKE , Daisuke NOTSU
Abstract: A control device mounted on a steer-by-wire steering device mounted on a vehicle includes a steering assembly including a steering wheel to be steered by a steering operator, a turning assembly including a first turning wheel and a second turning wheel, a turning side motor to drive the turning assembly, and a turning side controller configured or programmed to control a control target including the turning side motor. The turning side controller is configured or programmed to include a model following controller configured or programmed to generate a correction torque to correct an input torque input to the control target based on output of the control target and a nominal model based on a configuration of the control target. The model following controller is configured or programmed such that a transfer function of the control target is restricted to a transfer function of the nominal model.
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18.发明公开公开(公告)号：US20230227098A1
公开(公告)日：2023-07-20
申请号：US17928946
申请日：2021-06-09
Applicant: Nidec Corporation
Inventor： Shuji ENDO , Hiroaki MIZUSHIMA
Abstract: In a control device to control a motor in an electric power steering apparatus including the motor, processor executes, according to a program calculation of a target assist torque by performing proportional integral (PI) control based on a target steering wheel angle and a steering angle, and control of the motor based on the target assist torque. A gain of an integrator used for integral (I) control of the PI control is variable.
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公开(公告)号：US20230202554A1
公开(公告)日：2023-06-29
申请号：US18086285
申请日：2022-12-21
Applicant: Nidec Corporation
Inventor： Shuji ENDO , Sohei MIYAKE , Masaya ISHIKAWA , Daisuke NOTSU
CPC classification number: B62D5/0463 , B62D5/0421 , H02P23/0022
Abstract: A control device that controls a control target including at least a motor in a steering mechanism including an input shaft to which a steering wheel is connected, an output shaft connected to the input shaft via a torsion bar, and the motor connected to the output shaft. The control device includes a reaction force controller to generate an input torque input to the control target based on a torsion bar torque generated in the torsion bar and to control a reaction force transmitted from the steering wheel to the steering person, and an assist controller to generate a correction torque to correct the input torque based on an output of the control target and a nominal model. The assist controller is configured or programmed such that a transfer function of the control target is constrained by a transfer function of the nominal model in a frequency band.
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20.发明申请公开(公告)号：US20210297026A1
公开(公告)日：2021-09-23
申请号：US17266555
申请日：2019-08-07
Applicant: NIDEC CORPORATION
Inventor： Hiroki YOKOUCHI , Shuji ENDO
Abstract: Provided is a motor drive device including a motor having a rotor and a stator, an inverter electrically connected to the motor, and a control device for controlling the inverter. The control device includes: an impedance observer that estimates at least an amount of variation in impedance of the motor on the basis of a voltage command value, a current command value, and an actual current flowing between the inverter and the motor; a comparator that calculates a difference between the current command value and the actual current flowing between the inverter and the motor; and a failure detection unit that outputs a failure flag when the amount of variation in impedance exceeds or falls below a predetermined threshold, or when the difference calculated by the comparator exceeds or falls below a predetermined threshold.
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