本文關鍵詞： 高壓共軌 高壓泵 軌壓波動　出處：《吉林大學》2012年碩士論文　論文類型：學位論文

【摘要】：本文旨在研究高壓泵的結構參數(shù)的調整對于軌壓波動影響，選取博世CP1H型高壓泵為基礎，利用GT SUITE軟件組中的FUEL軟件建立高壓泵模型，，在與廣汽吉奧公司的合作的項目平臺中獲取穩(wěn)定工況下高壓共軌系統(tǒng)的壓力波動脈譜圖，對模型進行驗證。 在經(jīng)過深入分析博世CP1H型高壓泵以及博世共軌管的結構特點及工作原理后，確定高壓油泵中能夠對軌壓波動產生比較明顯的影響的一些結構參數(shù)：進油閥彈簧剛度、彈簧預緊力、球閥的質量，柱塞直徑。給模型中高壓油泵的主要結構參數(shù)設定不同值，用該模型仿真計算得出不同的軌壓波動曲線，對比分析不同的參數(shù)對軌壓波動的影響。本文經(jīng)過對比不同結構參數(shù)設定下的軌壓波動曲線，得出一些結論： 進油閥閥體質量較大時，軌壓波動幅度較�。贿M油閥彈簧預緊力取較大值時軌壓相對穩(wěn)定；進油閥彈簧剛度太小，在柱塞腔吸油初期閥體兩端壓差較小的時候，進油閥容易出現(xiàn)多次開啟關閉現(xiàn)象，影響供油壓力的穩(wěn)定性。而且會對閥座產生沖擊影響壽命。 相對于進油閥結構參數(shù)，供油相位、柱塞直徑和出油閥的結構參數(shù)的變動對軌壓波動的影響更加明顯。 柱塞直徑設定較小值時，循環(huán)供油量減少，每循環(huán)噴油系統(tǒng)的要求達到的噴油量和控制室消耗的一部分油量高壓泵無法完全滿足，高壓油軌的平均壓力已經(jīng)不能夠滿足保持軌壓穩(wěn)定。 為了保證各缸循環(huán)噴油量的均勻性，匹配高壓泵 發(fā)動機轉速比時要保證供油次數(shù)和氣缸數(shù)一致。 凸輪轉角中供油起始點滯后20度時軌壓波動幅度明顯減小，而且各缸噴油時刻附近的波動幅度和頻率都很一致，保持了良好的均勻性。 為了有效降低系統(tǒng)中的壓力波動，可選定較小的出油閥彈簧預緊力，以保證出油閥穩(wěn)定開啟。
[Abstract]:The purpose of this paper is to study the influence of structural parameters of high pressure pump on rail pressure fluctuation and select Bosch CP1H high pressure pump as the foundation. The high pressure pump model was established by using the FUEL software of GT SUITE software group, and the pressure wave arterial spectrum of the high pressure common rail system under steady working condition was obtained in the project platform of the cooperation with Guang Auto Gior Company. The model is validated. After in-depth analysis of Bosch CP1H high pressure pump and Bosch common rail tube structure characteristics and working principle. Determine some structural parameters in high pressure oil pump which can have obvious influence on rail pressure fluctuation: spring stiffness, spring pretightening force, ball valve quality. Plunger diameters. The main structural parameters of the high pressure oil pump in the model are set different values, using this model to calculate the different rail pressure fluctuation curve. The influence of different parameters on rail pressure fluctuation is analyzed. By comparing the rail pressure fluctuation curves with different structural parameters, some conclusions are drawn. When the mass of intake valve body is large, the fluctuation of rail pressure is smaller; The rail pressure is relatively stable when the pre-tightening force of the oil inlet valve spring is taken as a large value. Oil inlet valve spring stiffness is too small, in the initial plunger cavity suction valve body pressure difference between the two ends of the small, oil intake valve prone to multiple open and close phenomenon. Affect the stability of oil supply pressure. And impact on the seat impact life. Compared with the structure parameters of the inlet valve, the oil supply phase, the diameter of the plunger and the structural parameters of the oil delivery valve have more obvious effects on the fluctuation of rail pressure. When the plunger diameter is set at a small value, the circulating fuel supply will be reduced, and the fuel injection quantity and a portion of the fuel consumption consumed by the control room will not be fully satisfied with the requirements of the fuel injection system per cycle. The average pressure of the high pressure oil rail can no longer be satisfied to maintain the stability of the rail pressure. In order to ensure the uniformity of fuel injection rate in each cylinder cycle, the number of times of fuel supply and the number of cylinders should be consistent when matching the rotational speed ratio of high pressure pump. When the starting point of fuel supply in the cam angle lags 20 degrees, the fluctuation range of rail pressure is obviously reduced, and the fluctuation amplitude and frequency near the injection time of each cylinder are very consistent, which keeps good uniformity. In order to effectively reduce the pressure fluctuation in the system, a smaller spring preload can be selected to ensure the stable opening of the oil delivery valve.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH38

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