獨立主動轉向系統之設計

A Design of Active Independent Front Steering System

陳一凡(Yi-Fan Chen)

指導教授 ： 尤正吉

國立臺北科技大學/機電學院/車輛工程系所/碩士(2014年)

https://doi.org/10.6841/NTUT.2014.00770

摘要

本研究目的為提出一獨立式主動轉向系統之設計。首先分析傳統齒條小齒輪式機構，除了藉此驗證過程所用之機構解析法外，亦獲知其轉向幾何、轉向減速比、最大轉向角度等運動特性以為設計參考。接著以車輛低速過彎時理想之阿克曼軌跡為目標，利用封閉迴路方程式將此機構函數產生問題轉化為軌跡產生問題，利用行星輪上一點產生之擺線合成此軌跡以達成阿克曼轉向幾何，並且在衡量轉向幾何誤差、最大轉向角度、轉向比特性、機構尺寸等參數下得到最佳化設計，最後使用基本五桿行星齒輪組擴充其自由度為三，達成獨立主動轉向之功能，使車輛低速時能在不需馬達修正控制之情況下以阿克曼幾何過彎，中高速時則改變轉向幾何使外側輪角度增加以提供足夠之轉彎力增進車輛操控性及安全性。

關鍵字

行星齒輪機構 ； 轉向幾何 ； 獨立主動轉向

並列摘要

The purpose of this research is to propose a design of Active Independent Front Steering System. Firstly a traditional rack-and-pinion steering mechanism is being analyzed for verifying an analytical method and obtaining the kinematic characteristics such as steering geometry, steering reduction ratio and the maximum steer angle for being the reference of designing a novel mechanism. Second, aiming at Ackerman steering geometry which is an ideal case while the vehicle is cornering at low speed, the closed-loop equation is used to transfer the mechanism function generation problem into a path generation problem, which can be solved by the locus of certain point on the planet gear forming a cycloid trace around the ring gear proposed in this research. Then the optimum design is obtained with considering the steering geometry error, maximum steer angle, reduction ratio, and mechanism dimensions. Finally, expand the degree of freedom of motion by adding two sets of basic planetary gear train onto the Ackerman mechanism for achieving the independent active steering function which allows the vehicle at low speed to take a corner with Ackerman geometry but without motor modification, and at higher speed to add the outer wheel steer angle for the reason of offering more lateral force which could enhance the handling performance and the most important thing, safety.

並列關鍵字

Planetary Gear ； Steering Geometry ； Active Independent Front Steering

參考文獻

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