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Motor controller and electric power steering apparatus

A technology of motor control and current control, which is applied in the direction of electric steering mechanism, motor generator control, electromechanical brake control, etc., and can solve problems such as auxiliary force changes

Active Publication Date: 2008-12-24
JTEKT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, there is a problem in that since the motor current corresponding to the required torque is not generated, the motor drive is continued in a state where the original output performance is not exhibited, and thus the assist force fluctuates greatly.
At this point, there is still room for improvement

Method used

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  • Motor controller and electric power steering apparatus
  • Motor controller and electric power steering apparatus
  • Motor controller and electric power steering apparatus

Examples

Experimental program
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Effect test

Embodiment Construction

[0046] Hereinafter, an embodiment in which the present invention is embodied in an electric power steering system (EPS) will be described with reference to the drawings.

[0047] figure 1 It is a schematic configuration diagram of EPS1 of this embodiment. As shown in the figure, the steering shaft 3 to which the steering wheel (steering device) 2 is fixed is connected to the rack 5 through the rack-and-pinion mechanism 4, and the rotation of the steering shaft 3 accompanying the steering operation is converted into gear rack 5 by the rack-and-pinion mechanism 4. The reciprocating linear motion of bar 5. Then, the steering angle of the steered wheels 6 is changed by the reciprocating linear motion of the rack 5 .

[0048] In addition, the EPS 1 has: an EPS actuator 10 as a steering force assist device that provides an assist force for assisting a steering operation to the steering system; and an ECU 11 as a control unit that controls the operation of the EPS actuator 10 . ...

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PUM

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Abstract

The present invention provides a motor control device and an electric power steering device. Under any one phase generating the current-carrying failure, a micro computer 17 selects other two phases as electrifying phases except the phase generating the current-carrying failure, in order to generate phase current changing like a secant curve or a cosecant curve at making a predetermined rotational angle according to the phase generated the current-carrying failure as an asymptote at the generation of the current-carrying failure and continue an output of a motor control signal to execute a current control. In addition, the micro computer 17 comprises a rotational angle correcting section 40 correcting (offsetting) an input rotational angle (theta). Furthermore, when the two phases as electrifying phases of diphasic drive except the phase generating the current-carrying failure in order to compensating a phase offset between a phase current command value Ix* as a current command value and an actual phase current value Ix as an actual current value in the current control, and correct the rotational angle (theta) becoming the basis of the current control.

Description

technical field [0001] The invention relates to a motor control device and an electric power steering device. Background technique [0002] Conventionally, many motor control devices used in electric power steering (EPS) etc. are equipped with an abnormality detection unit, which detects any phase ( In the case of poor energization of any phase of UVW), it is possible to detect the occurrence of the abnormality. In addition, it is generally configured such that when the occurrence of the abnormality is detected, the motor control is promptly stopped for failsafe. [0003] However, in EPS, the steering characteristic largely changes with the stop of such motor control. That is, the driver needs a larger steering force in order to perform an accurate steering operation. From this point of view, conventionally, there is a motor control device in which, even when a phase with poor conduction is detected as described above, two phases other than the phase with poor conduction ...

Claims

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Application Information

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IPC IPC(8): H02P6/12H02P6/08B62D5/04B62D6/00B62D119/00B62D137/00H02P6/06H02P6/17H02P6/28H02P21/00H02P21/22H02P27/04H02P27/08
Inventor 玉泉晴天
Owner JTEKT CORP
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