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黑龍江工程學院本科生畢業(yè)設計
摘 要
液壓驅動可變配氣系統(tǒng)是無凸輪軸可變配氣技術的一種。通過對國內外各種電控液壓驅動可變配氣系統(tǒng)的分析和比較，本文提出了一款電控液壓驅動可變配氣系統(tǒng)設計方案，通過對該方案的主要結構參數(shù)，如柱塞半徑、氣門彈簧剛度、電磁閥流通面積等參數(shù)的研究，得到這種可變配氣系統(tǒng)運動特性規(guī)律，為系統(tǒng)的開發(fā)和研制提供幫助。
本文在設計的基礎上，開發(fā)出一套可變配氣系統(tǒng)，系統(tǒng)主要包括液壓系統(tǒng)、執(zhí)行機構以及控制系統(tǒng)等。將該系統(tǒng)安裝在4102BG發(fā)動機上，代替原來的配氣機構，并對該系統(tǒng)的性能進行了試驗研究。試驗結果表明：本套結構能夠控制氣門的氣門正時，緩解氣門落座沖擊。同時研究了運行參數(shù)如發(fā)動機轉速、液壓系統(tǒng)的壓力和驅動電壓對可變配氣機構控制特性的影響，這些參數(shù)不同程度地影響著可變配氣的動態(tài)特性。
關鍵詞：可變配氣系統(tǒng)；液壓系統(tǒng)；無凸輪軸可變配氣技術；氣門彈簧剛度；氣門正時。
外文摘要示例
ABSTRACT
This variable valve timing and lift system powered by electronic hydraulic system is one kind of variable valve timing and lift system without cam．By analyzing and comparing several kinds of domestic and intemational advanced electronically controlled variable valve timing and lift system，a new kind of variable valve timing and lift system is developed in this paper．The system simulation model is established for the variable valve timing and lift system．Then the studies on the main structure parameters of the system，such as piston diameter,spring rigidity of the valve and flow area of electro—magnetic valve，obtained the characteristics of the variable intake valve system，Both the model and this studies speed up the development processes，thus minimizing the number of hardware variations． Based on the design and the simulation，a test is conducted on the cylinder heads of 41 02BG diesel with the variable valve timing and lift system，which can provide experimental documents for validation．Test bench includes the hydraulic driving system、variable valve actuator system，and electronic control units system etc．According to the experiment，the control strategy was amended detailedly．As a result，a fast，precise and steady dynamic result as well as a reliable static state Was achieved．
Key word：Variable valve timing and lift system；The hydraulic；Without the camshaft variable valve timing technology；Valve spring stiffness；valve timing.
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