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摘 要：在AMESim环境下建立双阀电控单体泵系统的仿真模型，通过实验对比验证模型的准确性。研究压力峰值、喷油量及平均喷油速率等在低转速范围内随控制角度差和转速的变化规律，并探索双阀系统的三次喷射特性。试验结果表明，在低转速下，增加控制角度差能明显改善喷油特性，控制角度差小于4°（一定角度）时，喷油压力、平均喷油速率等随控制角度差的增加变化不明显，而喷油量增量随控制角度差的增加变化相对稳定。采用变速率凸轮型线能有效降低后喷射的喷射压力，有利于灵活控制后喷射的喷油量。

关键词：柴油机；双阀；单体泵；控制角度差；三次喷射

中图分类号：TK422 文献标识码：A

Research the Injection Characteristics of Dual-Valve Electronic Unit Pump System

Fan Liyun， Chen Chao， Wang Zuoqun， Song Enzhe， Hu Shuang， Zhang Jianyu

（School of Power and Energy Engineering Harbin Engineering University， Harbin 150001， Heilongjiang，China）

Abstract： Establishing the double-valve electronically controlled fuel injection system simulation model in the AMESim environment， verifing accuracy of the mode by comparing with experiments. During the low speed range， studing the variating regulation of the peak pressure， the fuel injection quantity and average injection rate for control angle difference， and exploring the three injection characteristics of double valve system. It obtains that at low speeds， increasing the angle difference can significantly improve the control injection characteristics， when the control angle difference is smaller than 4°（a certain angle）， the injection pressure， average injection rate and so on do not change significantly With the control of the average angle deviation increasing， but the fuel injection quantity increments is relatively poor stability with increasing of the control angle change. Using the variable cam profile speed can effectively reduce the injection pressure of the post-injection， it is conducive to flexible control of post-injection fuel injection quantity.

Key words： diesel； dual-valve； unit pump； controlling the angle difference； three injection

随着环境问题的日益加剧，减少排气污染已经成为柴油机的重点研究方向之一[1，5]。将电控单体泵与电控喷油器相结合的电控双阀燃油喷射系统具有喷射压力高、喷油规律和喷油量灵活可控等优点，是满足柴油机排放要求的新型燃油系统之一[6，9]。实现全工况范围内的高压喷射和多次喷射对改善柴油机的燃烧过程和整体性能至关重要，与电控单体泵相似，双阀燃油系统也属于压力脉动式的燃油系统，喷油压力受转速的影响非常显著，尤其是在低转速时，喷油压力低导致燃油的雾化质量差，排放性能降低[10，13]。

通过改变双阀燃油系统供油和喷油之间的时间间隔（控制角度差）可以在低转速时提高喷射压力，从而改善柴油机的整体性能[14-15]。……