GDI喷油器小脉宽非线性流量特性分析

梁迟迟; 张振东

车用发动机 ›› 2023, Vol. 0 ›› Issue (5) : 31-37.

栏目

GDI喷油器小脉宽非线性流量特性分析

梁迟迟，张振东

作者信息 +

Nonlinear Flow Characteristics of GDI Injector with Small Pulse Width

LIANG Chichi,ZHANG Zhendong

Author information +

文章历史 +

摘要

针对GDI喷油器流量特性在小脉宽下存在的非线性问题，分析了小脉宽非线性的成因并提出了一种能够精确控制小脉宽喷油量的闭环控制系统。该系统能够基于GDI喷油器驱动电压的反馈信号，识别出针阀关闭时刻，在不同温度、黏度下进行自学习，采用数据拟合的方式获得喷油器开启延迟时间。结果表明：该控制策略能有效提高GDI喷油器小脉宽流动特性的一致性，在小脉宽区燃油喷射量偏差最高可降低30%，大部分偏差都在±10%以内，线性模式下流量偏差均低于5%。

Abstract

Aiming at the nonlinear problem of the flow characteristics of GDI injector with small pulse width, the causes of small pulse width nonlinearity were analyzed and a closed-loop control system was proposed to precisely control its injection quantity. The system could identify the closing moment of needle valve based on the feedback signal of the driving voltage of GDI injector, and then conduct self-learning under different temperatures and viscosities. The delay time of fuel injector opening was obtained by data fitting. The results show that the control strategy can effectively improve the consistency of flow characteristics for GDI injector with small pulse width. In the regions of small pulse width, the maximum deviation of injection quantity reduces by 30%, most of the deviations are within ±10%, and the flow deviations are all less than 5% in the linear mode.