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Electric power steering assistance control method

A technology of electric power steering and control method, which is applied in the direction of automatic steering control components, electric steering mechanism, steering mechanism, etc., which can solve the problems that cannot be realized, and achieve the effects of accelerating the return speed, improving the feel and reducing the influence of friction

Inactive Publication Date: 2011-04-27
HANGZHOU ZHENGQIANG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But as we all know, the friction force is always opposite to the direction of relative motion. Obviously, such an ideal curve cannot be realized theoretically.

Method used

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  • Electric power steering assistance control method
  • Electric power steering assistance control method
  • Electric power steering assistance control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] Such as figure 2 and image 3 As shown in Fig. 1 , an electric power steering assist control method is based on the basic assist curve to calculate the torque change trend according to the historical state and the existing state, and select the assist curve segment according to the operation, so that the control characteristics of the actual controller are biased towards the ideal The shape of the power assist curve is to reduce the influence of friction, speed up the speed of returning to the center, and improve the feel. The zero curve 0 is the power assist curve when the torque is relatively small, and the first curve 1 is the steering and return to the bottom line when the torque variation trend is relatively small. The second curve 2 is the steering and return to normal peak line when the torque variation trend is relatively small, and the third curve 3 is the steering and return to normal acceleration line when the torque variation trend is relatively large. The...

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Abstract

The invention provides an electric power steering assistance control method. On the basis of a basic assistance curve, according to the history state and the existing state, a torque variation tendency is operated; according to the operation, an assistance curve section is selected, the control characteristic of a practical controller biases to an ideal assistance curve shape so as to lower friction influence, quicken aligning speed and improve feel; a zero curve is an assistance curve when the torque is smaller, the first curve is a steering and aligning base line when the torque various tendency is smaller, the second curve is a steering and aligning crest line when the torque various tendency is smaller, and the third curve is a steering and aligning acceleration line when the torque various tendency is bigger. The invention can carry out certain logic judgment for torque variation tendency, and the control characteristic of the practical controller is caused to bias to the ideal assistance curve shape according to a certain mathematical model, thus lowering friction influence, quickening aliening speed and improving feel.

Description

technical field [0001] The invention relates to an electric power steering assist control method. Background technique [0002] Electric power steering has been widely used in recent years due to its energy saving and precise control realized by computer. However, compared with hydraulic power steering, there are also some inherent deficiencies, such as weak damping, high moment of inertia, high frictional moment, etc. Some of these problems are caused by closed-loop control, and some are caused by the deceleration of the worm gear. The two technical solutions of current loop, torque loop or current loop, torque loop, and speed loop cannot escape the influence of dry friction of the system. In turn, it will affect the dynamic performance of the whole vehicle such as returning to the center and steering followability. In order to improve the dynamic control performance of the controller, a variety of compensation controls have emerged, such as return compensation, damping c...

Claims

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Application Information

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IPC IPC(8): B62D6/02B62D5/04
Inventor 许正庆
Owner HANGZHOU ZHENGQIANG ELECTRONICS TECH
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