胡若，刘福水，王沛，孙柏刚，张峥，高永利.电控单体泵燃油系统低速供油特性试验研究[J].内燃机工程,2017,38(1):70-75.
电控单体泵燃油系统低速供油特性试验研究
Experimental Study on Low Speed Fuel Delivery Characteristics of Electronic Unit Pump Fuel System
DOI：
关键词:内燃机  电控单体泵  低速  供油特性  喷油压力  针阀升程
Key Words:IC engine  electronic unit pump  low speed  fuel delivery characteristics  fuel pressure  needle lift
基金项目:国家国际科技合作项目（2013DFR70170）
作者单位
胡若，刘福水，王沛，孙柏刚，张峥，高永利 北京理工大学 机械与车辆学院，北京 100081 
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摘要:在电控单体泵试验台上进行了低速供油特性试验研究，分析了不同喷油持续期、凸轮轴转速条件下的喷油压力和针阀升程变化情况，并研究了低速时电控单体泵的喷油量循环变化规律。试验结果表明：电控单体泵低速工况时，电控单体泵喷油压力与针阀升程曲线存在明显波动，并随凸轮转速增加，波动变化减弱；在不同喷油持续期内，大持续期喷油压力与针阀升程曲线波动规律与小喷油持续期一致；低转速下小喷油持续期喷油量循环波动小于大持续期工况，且随凸轮转速增加，喷油量循环波动降低。
Abstract:The experiment of low speed fuel delivery characteristics was carried out on an electronic unit pump tester. The changes of injection pressure and needle valve lift with different injection duration and cam speed was analyged， and the variation rule of cycle injection quantity at low speed was studied. The experimental results show that， when the electronic unit pump works at low speed， the injection pressure and needle valve lift have obvious fluctuation and decrease with the increase of cam speed. For different injection duration， the fluctuation rule of injection pressure and needle valve lift of the large injection duration is consistent with that of the small injection duration. At low speed， the cycle fluctuation of injection quantity of the small injection duration is less than that of the large injection duration, and decrease with the increase of cam speed.
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