Title

獨立主動轉向系統之設計

Translated Titles

A Design of Active Independent Front Steering System

DOI

10.6841/NTUT.2014.00770

Authors

陳一凡

Key Words

行星齒輪機構 ; 轉向幾何 ; 獨立主動轉向 ; Planetary Gear ; Steering Geometry ; Active Independent Front Steering

PublicationName

臺北科技大學車輛工程系所學位論文

Volume or Term/Year and Month of Publication

2014年

Academic Degree Category

碩士

Advisor

尤正吉

Content Language

繁體中文

Chinese Abstract

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。

English Abstract

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.

Topic Category 機電學院 > 車輛工程系所
工程學 > 交通運輸工程
Reference
  1. [2] Olivier Le Maitre and Manfred Sussner. “Evaluation of Tire Wear Performance,” SAE Technical Paper 980256, 1998.
    連結:
  2. [3] Reza N. Jazar. “Vehicle Dynamics - Theory and Application,” 2008.
    連結:
  3. [4] J.Y. Wong. “Theory of Ground Vehicles,” 3rd edition, 2001.
    連結:
  4. [7] Azadeh Farazandeh, A.K. W. Ahmedand S. Rakheja. ”Performance Enhancement of Road Vehicles Using Active Independent Front Steering (AIFS),” SAE paper 2012-01-2013.
    連結:
  5. [9] Chi-Kuo Chen, Cheng-Chi Yu. “A Novel Design of the Planetary Gear Mechanism for Electric Parking Brake and Steering System.”
    連結:
  6. [10] H.B Pacejka, E. Bakker, and L. Lidner. “A New Tire Model with an Application in Vehicle Dynamics Studies,” SAE paper 890087, 1989.
    連結:
  7. [12] B.C. Lee and Amir Khajepour. “Vehicle Stability through Integrated Active Steering and Differential Braking,” SAE paper 2006-01-1022.
    連結:
  8. [1] M. Abe and W. Manning.”Vehicle Handling Dynamics Theory and Application,” 2009.
  9. [5] www.racing-car-technology.com.au/Steering Ackerman4.doc
  10. [6] BMW vehicle manual. ”Lateral Dynamics Systems, Model: E70.”
  11. [8] Robert L. Norton. “Kinematic and Dynamics of Machinery,” First Edition in SI Units.
  12. [11] R. Rajamani.“Vehicle Dynamics and Control,”2006.