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  • 【专利】 Electric power steering system

    作者:Mikihiko Tsunoda ; Mitsunori Okubo ; Naoki Sawada 年份:2013
    摘要: An electric power steering system is provided which can take an abnormality countermeasure without being affected by a torque abnormality signal and without giving an uncomfortable feeling to a driver when torque abnormality occurs. Abnormality of a steering assist command value is detected by employing a dual detection configuration of a main ECU clip (34) and a sub ECU interlock (62). When abnormality of a steering torque Ti detected by a torque sensor (3) is detected, input values to the main ECU clip (34) and the sub ECU interlock (62) are switched from the steering torque Ti detected by the torque sensor (3) to an alternative torque value. Here, the alternative torque value employs a previous torque value calculated based upon the normal steering torque Ti detected by the torque sensor (3) when the abnormality of the steering torque Ti detected by the torque sensor (3) is not detected.
  • 【专利】 Electric power steering system

    摘要: In an electric power steering system, a vehicle reactive force model computes a correction spring reactive torque in such a manner that an elasticity component included in a steering reactive force is increased with an increase in a lateral acceleration. As the lateral acceleration increases, an increase in a basic drive torque is suppressed by a larger amount. By an amount by which the magnitude of the basic drive torque is suppressed, a target pinion angle computed by a target pinion angle computing unit decreases and a correction component for a basic assist component is decreased. A steering assist force is decreased, and a steering reactive force is increased with a decrease in the steering assist force. Thus, it is possible to obtain an appropriate steering reactive force based on the magnitude of the lateral acceleration.
  • 【专利】 Electric power steering system

    作者:Satoru Mikamo ; Kenichiro Aoki 年份:2014
    摘要: There is provided a drive control method for a motor including multiple sets of coils and drive circuits in an electric power steering system. In order to reduce computational load when sensorless control is executed, an electrical angle estimator includes an α-axis voltage component adder and a β-axis voltage component adder that add together voltage vectors of a first coil and a second coil expressed in a two-phase fixed coordinate system, an α-axis current component adder and a β-axis current component adder that add together current vectors of the first coil and the second coil expressed in a two-phase fixed coordinate system, and an induced voltage computing unit that computes an induced voltage based on an added voltage vector and an added current vector.
  • 【专利】 Electric power steering system

    作者:Toshihiro Asakura 年份:2013
    摘要: A return passage that connects two points of a rolling passage to allow each ball that rolls in the rolling passage to endlessly circulate is formed in a ball screw nut by attaching a circulation member to fitting holes. A protrusion is formed on an outer surface of the circulation member at a position offset from a raceway of the balls that circulate in the return passage. The circulation member is fixed to the ball screw nut when the protrusion contacts an inner periphery of an inner ring of a second bearing.
  • 【专利】 Electric power steering system

    摘要: When a steering speed reaches a steering speed determination threshold, a steering speed gain is set to “0”. As a result, a final basic assist controlled variable becomes “0”, and application of an assist force to a steering system is stopped. Therefore, repetition of so-called reverse assist that is a cause of occurrence of an unintended steering behavior, such as self-excited vibration, is stopped. Accordingly, the steering behavior is improved.
  • 【专利】 Electric power steering system

    作者:Lin Shen ; Xiaojing Li ; Shulin Liang ; Jianhua Zhang 年份:2010
    摘要: An electric power steering system includes a power supply, a driving motor for supplying mechanical power, and an electric power steering controller configured to control the driving motor and provide power to the driving motor. A boosting module is operatively coupled between the power supply and the electric power steering controller and is configured to boost a power output of the power supply, and supply the boosted power output to the electric power steering controller so that the driving motor receives a boosted power level.
  • 【专利】 Electric power steering system

    摘要: An electric power steering system includes steering a torque detector that detects steering torque, and a motor that provides assist torque based on the detected steering torque, wherein for the purpose of estimating, without detecting motor rotation angular information and rotation angular velocity information, the road reaction torque in which the influence of the motor inertia torque is eliminated, a value corresponding to rotation velocity of a steering shaft is calculated based on the steering torque and the assist torque, to calculate road reaction torque based on the value corresponding to the rotation velocity of the steering shaft.
  • 【专利】 Electric power steering system

    作者:Yoshihide Kuroda 年份:2012
    摘要: A power relay is provided in a power line, which supplies power from a power source to a motor through an inverter circuit, to shut off power supply from the power source to the inverter circuit when an abnormality arises. A microcomputer diagnoses a short-circuit failure of the power relay when a steering wheel is not steered during a normal control operation of assisting the steering operation of the steering wheel. An EPS shuts off power supply by the power relay when the steering wheel is not steered, so that the short-circuit failure of the power relay is diagnosed without affecting the assist operation for the steering wheel.
  • 【专利】 Electric power steering system

    作者:Toyoki Sugiyama ; Masayasu Higashi 年份:2013
    摘要: An electric power steering system includes: an electric motor that generates assist torque; an auxiliary power supply device including a capacitor connected to a main power supply and discharging electric power to the electric motor; and a control device that controls the auxiliary power supply device. There is a plurality of modes of connection between the main power supply and the auxiliary power supply device. The control device switches the mode of connection between the main power supply and the auxiliary power supply device, depending on the situation.
  • 【专利】 Electric power steering system

    摘要: An electric power steering system includes a motor control device that controls, based on an assist command value, driving of a motor that gives an assist torque to a steering mechanism. The motor control device computes a first assist component based on a steering torque and a vehicle speed. A steered-angle command value is computed based on the steering torque and the first assist component, and a second assist component is computed by performing a feedback control that matches the steered angle with the steered-angle command value. The motor control device adds the second assist component to the first assist component so as to compute an assist command value. The motor control device includes a road information compensation portion that decreases an absolute value of the second assist component included in the assist command value when a skid is detected by a vehicle state detecting portion.
  • 【专利】 Electric power steering system

    作者:Takashi Kodera 年份:2014
    摘要: There is provided an electric power steering system that makes it possible to reduce an uncomfortable feeling given to a driver even when a detected steering torque value is held. The controller computes a detected steering torque value based on the detection signal, and provides compensation based on a compensation value to a basic current command value to compute a current command value. The controller executes feedback control for causing a current value of the motor to follow the current command value. The controller executes normal control in which the detected steering torque value is periodically updated and backup control in which periodic updating of the detected steering torque value and holding of the detected steering torque value are alternately executed. The controller switches compensation value between a compensation value used during execution of the normal control and a compensation value used during execution of the backup control.
  • 【专利】 Electric power steering system

    摘要: There is provided an electric power steering system that makes it possible to improve the driver's steering feel, and that includes a controller that controls driving of a motor. The controller computes a first assist component based on a steering torque. The controller computes a torque command value based on a basic drive torque that is the sum of the steering torque and the first assist component, and computes an assist compensation component through feedback control based on the torque command value. The controller computes a steered angle command value based on a value obtained by adding the assist compensation component to the basic drive torque, and computes a second assist component through feedback control based on the steered angle command value. The controller controls driving of the motor based on an assist command value that is the sum of the first assist component and the second assist component.
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