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Electric power steering apparatus

A technology for electric power steering and auxiliary devices, which is applied to electric steering mechanisms, automatic steering control components, steering mechanisms, etc., and can solve problems such as the limitation of the effect of compensation control.

Inactive Publication Date: 2008-10-22
JTEKT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the vibration component of the steering system extracted from the control output of the motor is an indirect component, a phase shift occurs in the compensation control based on the vibration component
Therefore, there is a limit in the effect of the compensation control, so an effective countermeasure for effectively suppressing the vibration of the steering system is desired

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0026] A description will be given below of a column type electric power steering apparatus (EPS) according to a first embodiment of the present invention with reference to the drawings.

[0027] As shown in FIG. 1 , a steering wheel 2 is fixed to a steering shaft 3 . The steering shaft 3 is connected to a rack shaft 5 via a rack and pinion mechanism 4 . The rotation of the steering shaft 3 following the steering operation is converted into the reciprocating linear motion of the rack shaft 5 by the rack-and-pinion mechanism 4 . Specifically, in the steering shaft 3, the column shaft 8 and the intermediate shaft 9 are coupled to each other via the universal joint 7a, and the intermediate shaft 9 and the gear shaft 10 are coupled to each other via the universal joint 7b. The pinion-rack mechanism 4 is composed of a pinion tooth 10a formed in an end portion of the pinion shaft 10 and a rack tooth 5a provided in the rack shaft 5 and meshing with the pinion tooth 10a. The recipro...

no. 2 approach

[0063] A description will be given below of a second embodiment of the present invention with reference to the drawings.

[0064] The main difference between the present embodiment and the first embodiment lies only in the control to suppress the vibration due to the stress applied to the steering wheel 12 . Therefore, for convenience of explanation, the same parts as those of the first embodiment are given the same reference numerals, and descriptions thereof are omitted.

[0065] Such as Figure 6 As shown in , the microcomputer 41 is provided with a judging section 61 as judging means, and the judging section 61 judges whether the driver is performing a steering operation, that is, whether the EPS 1 is in a steering state. In the case where the determination section 61 determines that the steering operation is being performed, that is, during the steering operation, the microcomputer 41 does not execute the enhancement of the torque inertia compensation control, that is, d...

no. 3 approach

[0078] A description will be given below of a third embodiment of the present invention with reference to the drawings.

[0079] The main difference between the present embodiment and the first embodiment lies only in the control to suppress the vibration due to the stress applied to the steering wheel 12 . Therefore, for convenience of explanation, the same parts as those of the first embodiment are given the same reference numerals, and descriptions thereof are omitted.

[0080] The microcomputer 41 is used as an uneven road surface determination device for determining whether the road surface on which the vehicle is traveling is uneven, that is, for determining whether the road surface is uneven. In the case where it is determined that the road surface to travel is an uneven road, the microcomputer increases the torque inertia compensation amount Iti corresponding to the compensation component based on the steering torque differential value in the same manner as in the firs...

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PUM

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Abstract

The invention discloses an electric power-assisted steering device which is applied to a stirring system, the stirring system transfer stirring operations of a driver to stirring wheels, the electric power-assisted steering device comprises: a stirring force auxiliary device which applies the auxiliary force to the stirring system to assist the stirring operations; a control device for controlling startup of the stirring force auxiliary device in accordance with a single indicating the state of the stirring system, wherein the control device calculates the target auxiliary force generated in the stirring force auxiliary device by adding compensation weight of differential coefficient value based on stirring torque to a fundamental auxiliary weight; and an extracting device which is able to extract, from the signal indicating the state of the stirring system, a special frequency weight corresponding to the vibration which is produced in the stirring system based on stress applied to the stirring wheels, wherein when the effective value of the extracted special frequency weight is equal to or larger than a predetermined threshold value, the control device increases the compensation weight of the differential coefficient value based on the stirring torque.

Description

technical field [0001] The invention relates to an electric power steering device. Background technique [0002] Generally, a power steering device for a vehicle includes an electric power steering device (EPS) provided with an electric motor as a driving source. Compared with hydraulic power steering devices, EPS has the characteristics of high layout flexibility and low energy consumption. Therefore, in recent years, introduction of EPS to various vehicles ranging from compact vehicles to large vehicles has been considered. [0003] In the aforementioned EPS, the vibration generated in the steering system is one of the factors that deteriorate the steering feel. In other words, if the driver feels the vibration of the steering system or abnormal noise caused by the vibration, the steering feeling will be largely deteriorated. Therefore, in the conventional EPS, as disclosed in, for example, Japanese Laid-Open Patent Publication Nos. 2006-27537 and 2006-335228, various c...

Claims

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Application Information

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IPC IPC(8): B62D5/04B62D6/10
Inventor 西村昭彦益启纯
Owner JTEKT CORP
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