連續無段變速系統之鋼帶輪推力分析

Analysis of the Thrust Force for CVT

鄭怡軒(Yi-Hsuan Cheng)

指導教授 ： 郭桂林

國立臺北科技大學/機電學院/車輛工程系所/碩士(2009年)

https://doi.org/10.6841/NTUT.2009.00027

摘要

一般傳統車輛在行駛的過程中遇到不同路況時，變速箱會因為加速或減速的需要進行換檔，當減速比發生變化時，會使內燃機工作區域處於不穩定狀態，且造成動力傳動系統的衝擊和內燃機的廢氣排放增加。為了使內燃機維持在一個最佳經濟燃油消耗區域之輸出狀態，利用無段變速系統能使換檔過程中動力銜接較為平順之特性，來達到提升燃油經濟性與乘坐舒適之性能。
本研究首先應用過去推導過的金屬帶式無段變速器主動鋼帶輪推力，傳遞至被動鋼帶輪之動力轉速動態方程式，將動態方程式利用MATLAB�Simulink軟體建構實驗平台的模型。透過無段變速系統模擬分析所得到的主動、被動鋼帶輪之側向推力和減速比的數據，與實驗後所獲得的減速比對應換檔電磁閥控制的主油壓關係之數據相互比對，同時在實驗時輸入的工作壓力之數據推算主動、被動鋼帶輪之側向推力，透過軟體建構的金屬帶式無段變速系統的模型進行模擬後的結果與實際實驗平台所量測後獲得的數據互相驗證。
根據驗證結果，本研究可有效縮短未來車輛傳動系統開發週期、節省實驗成本費用，讓金屬帶式無段變速系統能夠有更為廣泛的應用。

關鍵字

無段變速系統 ； 側向推力 ； 動態方程式 ； 模擬分析

並列摘要

In the conventional transmission, vehicles accelerate or decelerate through different terrain. Because the gear ratio shifts constantly, the engine doesn’t work in the optimal operating region, leading to intermittent loading applied to the power-train system and increased amount of exhaust. To enable the engine to operate at the optimal fuel economy condition, a continuously variable transmission (CVT) is employed. The CVT can provide smooth driving, thereby improving economical consumption of fuel as well as comfort of riding.
In the present study, a use of dynamic equations was developed to simulate the torque transferring between the driving and driven pulleys of the CVT system. A platform will be established using MATLAB�Simulink with consideration of the interaction among motor, CVT, and brakes. In the analysis model proposed herein, angular velocity and torque of the motor were used as input. Through the simulation carried out in the study, side loads of the pulleys and gear ratio were obtained. The result obtained from the simulation and that from the actual test were compared. A good match between the two results was demonstrated.
It was confirmed that the simulation carried out here could accurately predict the performance of CVT. With extensive application of metal-belt CVT in vehicles, the developed method can be used to predict the behaviors of CVTs. Significant hardware cost saving and shortening of testing time during new vehicle development could be realized.

並列關鍵字

Continuously Variable Transmissions(CVT) ； Thrust Force ； Dynamic Equation ； Simulation

參考文獻

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