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Electric power steering

A technology of electric power steering and electric motors, which is applied to electric steering mechanisms, power steering mechanisms, automatic steering control components, etc., can solve the problems of huge data volume and large memory usage, and achieve the effect of suppressing computing load and improving stability

Active Publication Date: 2020-07-24
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in order to avoid the situation of real-time calculation, it is possible to prepare a table in advance to output assist slope for steering torque and vehicle speed, but since the table is multi-dimensional, it will generate a huge amount of data, so there is a problem of excessive memory usage

Method used

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Embodiment approach 1

[0042] Next, an electric power steering device according to Embodiment 1 of the present invention will be described based on the drawings. figure 1 It is a configuration diagram showing the configuration of a steering system of a vehicle including the electric power steering device according to Embodiment 1 to Embodiment 5 of the present invention. figure 1 Among them, the steering system of the vehicle includes: the steering wheel 1 operated by the driver of the vehicle, the steering shaft 2 connected with the steering wheel 1, the rack and pinion mechanism 12 connected with the steering shaft 2, and the driver through the steering wheel 1, steering Wheels 3 and 4 that are steered by shaft 2 and rack and pinion mechanism 12.

[0043] Furthermore, the wheel steering system further includes the electric power steering device according to Embodiment 1 of the present invention. The electric power steering device includes: a motor 5 that generates assist torque for assisting the ...

Embodiment approach 2

[0100] Next, an electric power steering device according to Embodiment 2 of the present invention will be described. Figure 10 It is a block diagram showing the structure of the control device in the electric power steering system according to Embodiment 2 of the present invention. The difference from the structure of Embodiment 1 above is that the subtractor 23 is changed to the adder 25 and the phase compensation is changed. The configuration of the first embodiment is the same as that of the first embodiment except for the settings of the frequency characteristics of the device 24 and the high-frequency compensator 22 . In the following description, the differences from the configuration of Embodiment 1 will be mainly described.

[0101] The phase compensator 24 performs phase compensation for decreasing or increasing the high-frequency gain on the steering torque signal τ0 detected by the torque sensor 8 to obtain a compensated steering torque signal Tsca. The phase comp...

Embodiment approach 3

[0130] Next, an electric power steering device according to Embodiment 3 of the present invention will be described. Figure 15 It is a block diagram showing the configuration of a control device in the electric power steering system according to Embodiment 3 of the present invention. The difference from the configuration of the above-mentioned second embodiment is that the phase compensator 24 in the second embodiment is replaced with the phase compensator 27 as the second phase compensator in the subsequent stage of the assist torque command calculation unit 20 . The adder 26 is the same as the adder 25 in the second embodiment. Other configurations are the same as those in Embodiment 2. In the following description, differences from Embodiment 2 will be mainly described.

[0131] Figure 15 , the frequency characteristic of the phase compensator 27 is the same as that of Embodiment 2 Figure 11 The frequency characteristics of the illustrated phase compensator 24 are th...

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Abstract

The present invention includes a high-frequency compensation unit that outputs a high-frequency compensation signal obtained by filtering a high-frequency component of an assist torque command signal and multiplying it by a gain, and negatively or positively feeds back the high-frequency compensation signal to the steering torque signal. The corrected steering torque signal is input to an assist torque command computing unit, and the assist torque command computing unit outputs an assist torque command signal based on the corrected steering torque signal.

Description

technical field [0001] The present invention relates to an electric power steering device that outputs assist torque based on a steering torque signal. Background technique [0002] As is well known, in an electric power steering device that supplies assist torque generated by an electric motor to the steering system of a vehicle in accordance with the steering torque applied to the steering wheel of the vehicle by the driver of a vehicle such as an automobile, by determining The assist torque, and the magnification rate of the proportional relationship between the steering torque and the assist torque, that is, the torque proportional gain (also called the assist slope), is made larger, thereby reducing the driver's steering force, and the accompanying The control system vibration and other vibrations caused by the increase of the torque proportional gain are suppressed, so as to improve the driver's feeling. [0003] Conventionally, an electric power steering apparatus ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62D6/00B62D5/04
CPCB62D5/0463B62D6/008B60W10/20B62D5/0472B62D6/10
Inventor 家造坊勲田中贤太田中正治高岛章誉志
Owner MITSUBISHI ELECTRIC CORP
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