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1.发明授权公开(公告)号：US11084526B2
公开(公告)日：2021-08-10
申请号：US15988444
申请日：2018-05-24
发明人： Bo Yu , Ian Y. Hwa , Adam J. Kloess , Yu Cao
摘要： A system and method for passively and actively monitoring and determining the location of at least one mechanical anomaly for a power steering system of a vehicle is disclosed. The system includes one or more processors and a memory coupled to the processors. The memory stores a baseline waveform and data comprising program code that, when executed by the one or more processors, causes the system to receive at least one excitation signal and at least one response signal. The power steering system creates the response signal in response to receiving the excitation signal. In response to receiving the excitation signal and the response signal, the system is caused to estimate the frequency response between the excitation signal and the response signal based on a fast Fourier transform (FFT) algorithm. The frequency response is represented by an estimated waveform.
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2.发明申请公开(公告)号：US20160362131A1
公开(公告)日：2016-12-15
申请号：US14734200
申请日：2015-06-09
发明人： Ian Y. Hwa
CPC分类号： B62D5/0481 , B62D3/12 , B62D5/0424 , B62D5/0457 , B62D5/0463
摘要： A method for characterizing a stick-slip or stiction condition in an electrically-assisted steering system includes transmitting a first steering control signal from a controller to a rotary actuator as a periodic steering conditioning signal, receiving a second steering control signal via a steering assist motor throughout the test to electrically assist steering, transmitting a third steering control signal to the rotary actuator to cause alternate rotation of the steering shaft to a target angle rate at constant acceleration/deceleration, and measuring a steering torque output from the rotary actuator. A control action is executed when a difference in local maximum and minimum peak amplitudes of the steering torque output exceeds a calibrated threshold difference indicative of stiction. A system includes a rotary actuator, the steering system, a torque transducer operable for measuring a steering torque imparted to the steering shaft by the rotary actuator, and the controller noted above.
摘要翻译： 一种用于表征电动助力转向系统中的粘滑或静止状态的方法包括：将来自控制器的第一转向控制信号作为周期性的转向调节信号发送到旋转致动器，经由转向辅助电动机接收第二转向控制信号 在整个试验期间，电气地辅助转向，将第三转向控制信号传送到旋转致动器，以使转向轴以恒定的加速/减速度转换到目标角速度，并且测量从旋转致动器输出的转向转矩。 当转向转矩输出的局部最大和最小峰值幅度的差超过表示静止的校准阈值差时，执行控制动作。 系统包括旋转致动器，转向系统，用于测量由旋转致动器施加到转向轴的转向转矩的扭矩传感器以及上述控制器。
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公开(公告)号：US10532767B2
公开(公告)日：2020-01-14
申请号：US15840974
申请日：2017-12-13
发明人： Ian Y. Hwa , Bo Yu
摘要： Methods and apparatus are provided for determining steering performance. The method includes: generating a torque disturbance signal; applying the torque disturbance signal to a torque command of the steering system; measuring a value of torque on the steering system; recording the measured value and a value associated with the torque disturbance signal; computing at least one performance metric of the steering system based on the recorded measured value and the recorded value associated with the torque disturbance signal; and selectively improving a steering system based on the at least one performance metric.
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公开(公告)号：US09950736B2
公开(公告)日：2018-04-24
申请号：US14734196
申请日：2015-06-09
发明人： Ian Y. Hwa
CPC分类号： B62D5/0481 , B62D5/0409 , B62D5/0421 , B62D5/0457 , B62D5/0463 , B62D6/00
摘要： A method for characterizing a stick-slip condition in a steering system includes transmitting a periodic steering control signal to a rotary actuator to cause rotation of a steering shaft, through a torsion bar and inertia wheel, over a range of steering angles, and applying an axial force to a rack to resist rack displacement from a centered position. A steering torque output value is measured via a torque transducer. A control action is executed when a measured difference between a maximum value of a steering torque required to initiate rack motion/torque breakaway and a minimum value of the steering torque after breakaway for start-up or subsequent steering reversal exceeds a calibrated threshold. A system includes the rotary actuator, steering system, torque transducer, torsion bar, inertia wheel, linear actuator(s) providing an axial force along the rack axis to resist rack displacement from a centered position, and controller programmed as noted above.
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公开(公告)号：US09669867B2
公开(公告)日：2017-06-06
申请号：US14734200
申请日：2015-06-09
发明人： Ian Y. Hwa
CPC分类号： B62D5/0481 , B62D3/12 , B62D5/0424 , B62D5/0457 , B62D5/0463
摘要： A method for characterizing a stick-slip or stiction condition in an electrically-assisted steering system includes transmitting a first steering control signal from a controller to a rotary actuator as a periodic steering conditioning signal, receiving a second steering control signal via a steering assist motor throughout the test to electrically assist steering, transmitting a third steering control signal to the rotary actuator to cause alternate rotation of the steering shaft to a target angle rate at constant acceleration/deceleration, and measuring a steering torque output from the rotary actuator. A control action is executed when a difference in local maximum and minimum peak amplitudes of the steering torque output exceeds a calibrated threshold difference indicative of stiction. A system includes a rotary actuator, the steering system, a torque transducer operable for measuring a steering torque imparted to the steering shaft by the rotary actuator, and the controller noted above.
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6.发明授权公开(公告)号：US10768075B2
公开(公告)日：2020-09-08
申请号：US16008677
申请日：2018-06-14
发明人： Bo Yu , Ian Y. Hwa
摘要： A system and method for determining a frequency response of a power steering system is disclosed including a steering assist motor configured to generate an assist torque about an axis of a steering shaft when activated. The method includes monitoring, by a controller, a torque transducer that measures a steering output torque of the steering shaft experienced during a first frequency sweep and a second frequency sweep. The method also includes determining, by the controller, a transfer function based on the steering output torque monitored during the first frequency sweep and the second frequency sweep, where the transfer function indicates the response by the power steering system.
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公开(公告)号：US09885638B2
公开(公告)日：2018-02-06
申请号：US14690654
申请日：2015-04-20
发明人： Kenneth L. Oblizajek , John D. Sopoci , Ian Y. Hwa
IPC分类号： G01M17/06
CPC分类号： G01M17/06
摘要： Methods and apparatus are provided for determining steering performance. The method includes coupling at least one load source to the steering system, and coupling a portion of the steering system to an angle input source. The method also includes outputting one or more control signals by a processor to the at least one load source to apply a load to the steering system and outputting one or more control signals by the processor to the angle input source to apply an input to the steering system. The method includes receiving torque data indicating a performance of the steering system based on the load applied to the steering system by the at least one load source and the input applied by the angle input source.
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公开(公告)号：US20160362130A1
公开(公告)日：2016-12-15
申请号：US14734196
申请日：2015-06-09
发明人： Ian Y. Hwa
CPC分类号： B62D5/0481 , B62D5/0409 , B62D5/0421 , B62D5/0457 , B62D5/0463 , B62D6/00
摘要： A method for characterizing a stick-slip condition in a steering system includes transmitting a periodic steering control signal to a rotary actuator to cause rotation of a steering shaft, through a torsion bar and inertia wheel, over a range of steering angles, and applying an axial force to a rack to resist rack displacement from a centered position. A steering torque output value is measured via a torque transducer. A control action is executed when a measured difference between a maximum value of a steering torque required to initiate rack motion/torque breakaway and a minimum value of the steering torque after breakaway for start-up or subsequent steering reversal exceeds a calibrated threshold. A system includes the rotary actuator, steering system, torque transducer, torsion bar, inertia wheel, linear actuator(s) providing an axial force along the rack axis to resist rack displacement from a centered position, and controller programmed as noted above.
摘要翻译： 用于表征转向系统中的粘滑条件的方法包括：向旋转致动器传送周期性转向控制信号，以在转向角范围内通过扭杆和惯性轮转动转向轴，并施加 轴向力到机架以抵抗从中心位置的齿条位移。 通过转矩传感器测量转向转矩输出值。 当启动机架运动/扭矩分离所需的转向转矩的最大值与启动或后续转向反转的分离后的转向转矩的最小值之间的测量差超过校准的阈值时，执行控制动作。 系统包括旋转执行器，转向系统，转矩传感器，扭杆，惯性轮，沿着齿条轴线提供轴向力的线性致动器，以抵抗来自中心位置的齿条位移，以及如上所述编程的控制器。
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9.发明申请公开(公告)号：US20190383707A1
公开(公告)日：2019-12-19
申请号：US16008677
申请日：2018-06-14
发明人： Bo Yu , Ian Y. Hwa
摘要： A system and method for determining a frequency response of a power steering system is disclosed including a steering assist motor configured to generate an assist torque about an axis of a steering shaft when activated. The method includes monitoring, by a controller, a torque transducer that measures a steering output torque of the steering shaft experienced during a first frequency sweep and a second frequency sweep. The method also includes determining, by the controller, a transfer function based on the steering output torque monitored during the first frequency sweep and the second frequency sweep, where the transfer function indicates the response by the power steering system.
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公开(公告)号：US09604665B2
公开(公告)日：2017-03-28
申请号：US14718465
申请日：2015-05-21
CPC分类号： B62D5/046 , B62D3/12 , B62D5/0481 , B62D6/08 , G01L5/221 , G01M13/021 , G01M17/06
摘要： A method for characterizing a stiction condition in a manual steering gear includes transmitting a steering input control signal to a rotary actuator, and rotating a steering shaft with constant acceleration, via the rotary actuator, in response to the steering input control signal. A steering output torque is determined while rotating the steering shaft with the constant acceleration, receiving the steering output torque via the controller, and executing a control action when a rate of the received steering output torque exceeds a threshold rate indicative of the stiction condition. A system includes a rotary actuator, a manual steering gear having a steering shaft connected to the rotary actuator, a torque transducer for measuring a steering output torque imparted to the steering shaft by the actuator, and a controller programmed as set forth above.
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