應用電子水泵技術改善渦輪增壓引擎機油碳化問題

能源危機與環境保護是近年來各國所遇到的最大問題，為了降低車輛的油耗與污染排放，各國紛紛制定汽機車廢氣排放標準的法規，並且逐年加嚴。以零油耗、零排放為目標，純電動車是一個理想的動力源，但在電池成本、安全性等尚無顯著的技術突破情況下，傳統內燃機在油耗與排放技術的改善仍是重要的課題，在此情況下渦輪增壓技術被廣泛的應用；渦輪增壓技術的優點在於利用廢氣來推動輪葉以增加進氣效率提升動力的輸出，缺點是當引擎停機時候產生超過250℃以上的高溫，而此高溫常常會帶來機油的劣化以致影響冷卻效果。本研究主要目的係在冷卻水循環系統上，加入一個小型的電子水泵，其功能僅在冷卻水溫過高及熄火時作動，以降低循環水溫度，以及加速熄火後，渦輪增壓器軸承部溫度下降幅度，避免機油造成碳化。本研究將針對電子水泵應用的作動時間、系統架構做一設計，並以實驗的方法找出最佳的控制邏輯，以降低渦輪增壓器軸承部的溫度，避免機油高溫劣化造成碳化現象。從研究的結果知，當引擎熄火後因周遭環境關係，渦輪增壓器內部軸承會因後沸狀況而產生溫升現象，依據研究所提出之架構及控制方法能較原渦輪增壓器溫度約225℃有效降低至112℃，可達到延長機油壽命進而避免因高溫導致機油碳化問題。

關鍵字

渦輪增壓器；渦輪增壓引擎；渦輪增壓器溫；電子水泵；機油碳化

並列摘要

Energy crisis and environmental protection have been the most important issues these days. Many countries had already set up relevant legislations to achieve the goal of zero-emission and to decrease the fuel consumption. However, there is still much improvement needed in terms of conventional combustion engine. The technology of turbocharger can improve the intake efficiency and the engine power, but it may cause the engine oil to degraded and insufficient the lubrication system by the high temperature above 250℃ when the engine stops. The purpose of this paper is to overcome the high temperature issues from turbocharger bearings when engine stops, by utilizing an additional smaller Electric Water Pump (EWP) in the cooling system, it only operates when the coolant is over heating or when the engine stops to prevent the oil from degrading. The system's layout, operating time and duration are investigated in this paper to obtain optimal performance. The primarily experiment results show that the proposed layout and control strategy had effectively lowered the temperature from 225℃ to 112℃ relative to the conventional one.

並列關鍵字

Turbocharger ； T/C ； Turbo-Charger Engine ； Temperature of Turbo-Charger ； Electric Water Pump

參考文獻

3.H. Petitjean, “Advanced Gasoline Engine Turbocharging Technology for Fuel Economy Improvements,” SAE Paper No. 2004-01-0988.

4.B. Lecointe and G. Monnier, “Downsizing a Gasoline Engine Using Turbocharging with Direct Injection,” SAE Paper No. 2003-01-0542.

9.E. G. Ribeiro, W. B. Melo, and A. P. A. Fiho, “Application of electric oil pump on automotive systems,” SAE Paper No. 2005-01-4086.

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13.E. G. Riberio, A. P. D. A. Fiho, and J. L. D. C. Meira, “Electric water pump for engine cooling,” SAE Paper No. 2007-01-2785.

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應用電子水泵技術改善渦輪增壓引擎機油碳化問題

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