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research-article

Effect of retarded injection timing on knock resistance and cycle to cycle variation in GDI engine

[+] Author and Article Information
Lei Zhou

State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
zhouleiquan@163.com

Aifang Shao

State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
739599196@qq.com

Jianxiong Hua

State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
hjx0827@foxmail.com

Haiqiao Wei

State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
whq@tju.edu.cn

Dengquan Feng

State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
fengdq@tju.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4039322 History: Received August 06, 2017; Revised January 26, 2018

Abstract

In spark ignition engines, gasoline direct injection (GDI) is surely the most attractive technology to achieve the demand of high energy efficiency of spark ignition engine by directly injecting fuel into combustion chamber. The present work, as a preliminary study investigates, the effect of retarded injection timing on knock resistance and cycle-to-cycle variation in gasoline engine by experimental method. The retarded injection timing during compression stroke coupled with increased intake air temperature was employed to concentrate on suppressing knock occurrence with stable combustion. Based on the great advantage of injection timing retard on knock suppression, intake temperature was used in this work to reduce cycle-to-cycle variation. In addition, piezo-electrically actuated injector was employed. The results show that injection timing retard during compression stroke can significantly suppress the knock tendency, but combustion becomes the unstable and cycle-to-cycle variation is larger than 10%. Thus, increasing intake temperature decreased the cycle-to-cycle variation but increased significantly the knock tendency, as expect. Meanwhile, rich fuel-air mixture in this work also had the same effect as intake temperature did. It can be concluded that retarded injection timing is of significant potential to suppress the knock in GDI engine, although the high intake temperature causes high probability of large knock occurrence. The percentages of knock at the spark timings of 24 0CA BTDC and 26 0CA BTDC were significantly reduced from approximately 40% to 7% and from approximately 60% to 10%, respectively.

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