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基于一维仿真软件GT-Suite模拟电控高压共轨燃油喷射系统及柴油机整机模型,探究电控喷油器关键参数对喷油规律的影响。研究表明,提高喷嘴流量系数可以大幅度提高喷油速率,且加快后期断油;控制室容积进、回油节流孔直径对针阀开启和关闭有很大影响;随着控制室容积增加,喷油规律曲线向右平移,针阀关闭速度变慢;电磁力对针阀开启影响较大,且随着电磁力的增加,初期喷油速率有所增加;针阀弹簧预紧力会影响针阀开启和关闭的速度。研究结果对高压共轨电控喷油器的确定和优化具有一定的参考价值。
Based on the one-dimensional simulation software GT-Suite to simulate the high-pressure common rail fuel injection system and the diesel engine model, the influence of the key parameters of fuel injection on the fuel injection law was explored. The research shows that increasing the nozzle flow coefficient can greatly improve the fuel injection rate and speed up the fuel cutoff in the late stage. The control chamber volume and the oil return orifice diameter greatly affect the opening and closing of the needle valve. As the control chamber volume increases, The curve of fuel injection is shifted to the right and the valve closing speed is slowed down. The electromagnetic force has a great influence on the opening of the needle valve, and the initial injection rate increases with the increase of electromagnetic force. The needle valve spring preload will affect the needle Valve open and closed speed. The research results have certain reference value for the determination and optimization of high pressure common rail electric injector.