自動變速箱換檔機構之建模與實驗驗證

Modeling and Experimental Verification of the Shifting Mechanical System for an Automatic Transmission

鐘家銘(Chia-Ming Chung)

指導教授 ： 吳向宸 ； 鄒忠全

崑山科技大學/工程學院/機械工程研究所/碩士(2006年)

摘要

三菱汽車所使用的F4A4自動變速箱，其換檔控制方式採用離合器至離合器之型式，這種設計可以省去單向離合器控制型式所使用之單向離合器，如此可使變速箱之體積更小、重量更輕與成本更低；但這也使得換檔時的抖動更大，換檔控制的難度提高。
本文利用自由體圖的方法與力矩平衡觀念，推導出F4A41自動變速箱所使用複合式行星齒輪組從一檔切換到四檔時的扭力傳遞動態數學模式與動態限制條件式。利用這些數學模式可用來模擬和分析換檔時之扭力傳遞的動態反應和特性，並可依此進一步研究與設計最佳的控制法則。本文同時針對F4A41自動變速箱之扭力變換器，測量其扭力比、容量因素和效率等性能特性，並將其放入汽車全車性能分析之模擬程式中。最後在自動變速箱實驗台上測量自動變速箱在換檔時的油壓、扭力與轉速之變化，以驗證模擬結果之正確。

關鍵字

扭力 ； 限制條件 ； 自動變速箱 ； 動態數學模式

並列摘要

The F4A4 automatic transmission of the Mitsubishi Motors uses clutch-to-clutch control type mechanism to shift gear instead of using one-way clutch mechanism. This design can reduce the components of one-way clutch, so the automatic transmission becomes more compact, lighter, and lower cost. The disadvantage is that during shifting, the transmission has harsher vibration and becomes harder to control.
This paper utilizes the free-body diagram and the concept of torque balance to derive the dynamic mathematical models of torque transmission and constraint conditions from 1st gear to 4th gear. The dynamic responses and shifting characteristics can be simulated and analyzed by using a simulation program based on the above mathematical models. Furthermore, a control algorithm can be studied and optimally designed accordingly. In this paper, the torque converter’s performance characteristics, such as torque ratio, capacity factor, and efficiency, are measured on the test rig and put into the simulation program to analyze the torque transmission. At last, the oil pressures, torques, and rotational speeds are measured on the test rig to compare with simulation results. The validation and verification will be done thereafter.

並列關鍵字

Dynamic Mathematical Model ； Constrain Condition ； Torque ； AutomaticTtransmission

參考文獻

[1] K. Usuki, K. Fujita, and K. Hatta, “The INVESINVECS-II Electronically Controlled Automatic Transaxles for FWD Passenger Cars,” SAE Paper No.960429, pp.87-99, 1996.

[2] W. H. Wilkinson, “Four Ways to Calculate Planetary Gear Train,” Machine Design, , pp. 155-159, January 7, 1960.

[3] F. Freudenstein, and A. T. Yang, “Kinematics and Statics of a Coupled Epicyclic Spur-Gear Train, ” Mechanism and Machine Theory, Vol. 7, pp.263-275, 1972.

[5] C. H. Pan and J. J. Moskwa, “Dynamic Modeling and Simulation of the Ford AOD Automobile Transmission,” SAE Paper No.950899, pp. 111-120, 1995.

[7] Q. Zheng, K. Srinivasan, and G. Rizzoni, “Dynamic Modeling and Characterization of Transmission Response for Controller Design , ” SAE Paper No.981094, pp. 207-217, 1998.