直喷发动机喷油器弹道区流动特性校正研究

P.-Y. Sun, Baiyu Xin, Xing Wang, Huifeng Zhang, Li Long, Qiang Wang
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引用次数: 1

摘要

高压喷油器是直喷发动机的关键传动装置。然而,制造偏差导致弹道区流动特性不一致,影响燃油控制精度。基于高压喷油器驱动电压反馈信号,研究了针阀启闭动作特性识别算法,提出了流量特性自学习方法和喷油器驱动脉宽补偿方法。试验结果表明,该方法可以有效提高不同喷油器弹道区流动特性的一致性,将偏差从25%降低到10%,并有效提高燃油喷射精度,从而在更多发动机工况下提高燃油轨压力,采用喷射劈裂或增加喷射劈裂次数,从而改善排放。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Research on Correction of Flow Characteristics in Ballistic Zone of GDI Engine Injector
High-pressure injectors are the key actuators of a GDI engine. However, manufacturing deviation leads to the inconsistency of flow characteristics in the ballistic zone, which affects the accuracy of fuel control. Based on the feedback signal of driving voltage of high-pressure injector, the algorithm of recognizing the opening and closing action characteristics of needle valve is studied, and the self-learning method of flow characteristics and the compensation method of injection driving pulse width are proposed. The test results show that the method can effectively improve the consistency of flow characteristics in the ballistic zone for different fuel injectors, reduce the deviation from 25% to 10%, and effectively improve the fuel injection accuracy, so that fuel rail pressure can be increased, injection splitting can be adopted or injection splitting times can be increased under more engine conditions, so as to improve emissions.
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