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  • 【专利】 Electric power steering system

    作者:Hayato ; Yoshinobu ; Yuji ; Shingo ; Yasuyuki Komatsu ; Shimizu ; Kariatsumari ; Maeda ; Yoshii 年份:2011
    摘要:An electric power steering system includes a motor that applies assist force to a steering system, and updates a motor resistance (Rm) that is a value indicating a resistance of the motor. Specifically, the motor resistance (Rm) is updated on the basis of the fact that an induced voltage (EX) of the motor is smaller than a first determination value (GA). In addition, when the induced voltage (EX) is smaller than or equal to a second determination value (GB), a divided value that is obtained by dividing a motor voltage (Vm) by a motor current (Im) is set as a new motor resistance (Rm).
  • 【专利】 Electric power steering system

    作者:Jun Hamakita 年份:2011
    摘要:An electric power steering system includes a worm reduction gear. An end portion of worm shaft, the end portion being distant from a motor, is urged toward a worm wheel. The worm shaft is supported by a bearing at an end portion close to the motor. A movement inhibitor that includes an elastic element is arranged between the worm shaft and the bearing. The movement inhibitor allows the worm shaft to move within a predetermined range in a radial direction of the worm shaft with respect to the bearing and allows the worm shaft to move within a predetermined range in an axial direction of the worm shaft with respect to the bearing.
  • 【专利】 Electric power steering system

    年份:2012
    摘要:Assist force that assists an operation of a steering system of a vehicle is applied to a rack shaft by transmitting driving force of a motor to the rack shaft via a motor shaft and a ball screw nut. A step is formed on the outer periphery of the ball screw nut. An end portion of a third housing is arranged to face a bearing such that the distance that the ball screw nut is able to move relative to the motor shaft in axial direction and the relative movable length is longer than a predetermined length.
  • 【专利】 Electric power steering system

    作者:Yasuo Shimizu 年份:2011
    摘要:An electric power steering system includes a steering wheel, a rack-and-pinion type steering gear box connected to the steering wheel, a steering torque sensor, a pinion shaft, and a steering actuator mounted on the pinion shaft to assist a steering operation conducted by a driver. An overload preventing control is conducted so that a sum of a torque conversion value of an assist current and a steering torque detected by the steering torque sensor equal a predetermined threshold value. When the steering gear box has reached a stroke end, and the assist current or the steering torque is smaller than a predetermined threshold value, the overload preventing control is conducted using a threshold value that is less than the predetermined threshold value.
  • 【专利】 Electric power steering system

    作者:Hiroshi Suzuki 年份:2011
    摘要:In an electric power steering system, a control signal output section outputs independent dual-system control signals to driver circuits that are disposed in connection with independent dual-system motor coils. The control signal output section gives high priority to the output of the control signal to the other system, when the occurrence of energization failure is detected in one system. When the energization failure occurring phase is only one phase and the value of the basic command exceeds the upper limit of the priority command, the control signal output section outputs the control signal to the driver circuit in the system where the energization failure has occurred in order to supply electric power in which the two phases other than the energization failure occurring phase are used as the energized phases on the bases of the complementary command that corresponds to the excess of the upper limit.
  • 【专利】 Electric power steering system

    作者:Keisuke Izutani 年份:2012
    摘要:An inverter energy consumption calculating portion estimates the actual power consumption of a steering operation assist motor after an engine is placed in an idle-stop state, and a command value of current to be supplied to the steering operation assist motor is limited such that the command value is smaller as the energy consumption is larger. The inverter energy consumption calculating portion calculates the energy consumption of an inverter drive circuit by integrating an amount of electric power consumed by the drive circuit.
  • 【专利】 Electric power steering system

    作者:Yoshikazu Kuroumaru 年份:2012
    摘要:A torque sensor and an electric motor are supported by a steering column by which a steering shaft is rotatably supported. On a control board on which a control circuit that controls driving of an electric motor is mounted, a first terminal group and a second terminal group that are selectively connected to the torque sensor are respectively provided at a first end portion and a second end portion in a first direction parallel to a central axis of the steering shaft. A third terminal group that is connectable to the electric motor is provided at one end portion (third end portion) in a second direction perpendicular to the first direction.
  • 【专利】 Electric power steering system

    作者:Kozo ; Yuji Niimi ; Kariatsumari 年份:2012
    摘要:An electric power steering system calculates a motor resistance Rm using a resistance map, and calculates an estimated inducted voltage based on a motor current and a motor voltage. If the estimated induced voltage is determined as being equal to or smaller than a determination value that is set in accordance with the current level, the electric power steering system calculates a motor resistance (estimated motor resistance Rma) and updates the resistance map based on the estimated motor resistance Rma.
  • 【专利】 Electric power steering system

    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

    作者:Shigeki Ehara ; Hiroyuki Tokunaga 年份:2009
    摘要:
  • 【专利】 Electric power steering system

    作者:Shigetoshi Yamaguchi ; Tomohiro Niwa 年份:2009
    摘要:In an electric power steering system, a motor drive controller that has an inverter circuit board and a control circuit board housed in a control case is provided so as to overlap a control case fixation surface formed at an end portion of a gear housing in the axial direction of a steering shaft, so that it is possible to reduce the projection in the axial direction of a motor as compared to the conventional one. In addition, a metallic board is used for the inverter circuit board and the inverter circuit board is fixed to the control case fixation surface so as to be in surface contact therewith, so that it is possible to efficiently dissipate the heat generated on the inverter circuit board into the gear housing and a fixation support plate.
  • 【专利】 Electric power steering system

    年份:2013
    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.
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