MODELING ANALYSIS ON IMPROVING CYLINDER BALANCE IN A
GASOLINE ENGINE USING ELECTROMAGNETIC VALVE TRAIN

Xu, Yaxuan; Chang, Siqin; Liu, Liang; Wang, Tianbo; Hu, Maoyang

doi:2019.20.6.1195

International Journal of Automotive Technology > Volume 20(6); 2019 > Article

Engine, Emission Technology

International Journal of Automotive Technology 2019;20(6): 1195-1203.
doi: https://doi.org/10.1007/s12239-019-0112-x

MODELING ANALYSIS ON IMPROVING CYLINDER BALANCE IN A GASOLINE ENGINE USING ELECTROMAGNETIC VALVE TRAIN

Yaxuan Xu¹, Siqin Chang¹, Liang Liu¹, Tianbo Wang², Maoyang Hu¹

¹Nanjing University of Science and Technology
²Jiangsu University of Technology

Corresponding Author. Siqin Chang , Email. changsq@njust.edu.cn

ABSTRACT

For the multi-cylinder gasoline engine, the consistency among cylinders is an important index to affect the engine emission and the engine power. In this paper, an individual cylinder air-fuel ratio (A/F) control method for a fourcylinder camless engine with the electromagnetic valve train (EMVT) was proposed to reduce the imbalance of engine torque. An individual cylinder A/F estimation algorithm with a single universal exhaust gas oxygen (UEGO) sensor based on fading Kalman filtering was introduced. Four proportional-integral feedback controllers were built to regulate the individual A/F by adjusting the intake valve closing (IVC) timing of each cylinder independently based on the EMVT. The effectiveness of the proposed estimation and control approach was validated by co-simulation of GT-Power and Simulink. The results showed that the proposed estimation method could accurately estimate the individual cylinder A/F, and the maximum estimation error under steady state condition was less than 1 %. With the feedback control, both the individual A/F imbalance and the cylinderto- cylinder torque generation imbalance were decreased.

Key Words: Individual A/F control, Gasoline engine, Electromagnetic valve train, Torque balancing

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