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research-article

Effects of exhaust gas recirculation on knock intensity of a downsized gasoline spark ignition engine

[+] Author and Article Information
Miangzhang Pan

College of Mechanical Engineering, Guangxi University, Nanning 530004, China
panmingzhang@tju.edu.cn

Haiqiao Wei

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

Dengquan Feng

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

1Corresponding author.

ASME doi:10.1115/1.4040528 History: Received August 14, 2017; Revised May 29, 2018

Abstract

Exhaust gas recirculation (EGR) gained prominence as a significant method to control port fuel injection (PFI) engine knock caused by high compression ratio and high intake pressure. In this paper, the effect of EGR on knock intensity were investigated under various conditions which included different compression ratios (9:1; 10:1; 11:1), intake pressures (1.0bar; 1.2bar; 1.4bar) and intake temperatures (20°C; 40°C; 60°C). The torque output being a crucial variant was also considered. The results showed that EGR effectively reduced the maximum amplitude of pressure oscillations (MAPO) and knock intensity factor (KI20). More significant knock resistance benefited from EGR was observed under higher compression ratio, intake pressure and intake temperature. The output torque of the engine reached a peak value with a suitable EGR ratio which also controlled the intensity of knock under different conditions.

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