Effect of EGR and Fuel Injection Strategies on the Heavy-Duty Diesel Engine Emission Performance under Transient Operation

Fangyuan Zhang, Zhongshu Wang, Jing Tian, Linlin Li, Kaibo Yu and Kunyi He
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Fangyuan Zhang: The State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China
Zhongshu Wang: The State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China
Jing Tian: The State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China
Linlin Li: SAIC, Shanghai 201201, China
Kaibo Yu: Shanghai Volkswagen Automotive Co., Ltd., Shanghai 201805, China
Kunyi He: The State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China

Energies, 2020, vol. 13, issue 3, 1-17

Abstract: To reduce the smoke and nitrogen oxide (NOx) emissions; a detailed study concerned with exhaust gas recirculation (EGR) and diesel injection strategy was conducted on a two-stage series turbocharging diesel engine under transient operating condition. One transient process based on the constant speed of 1650 r/min and load increases linearly from 10% to 100% within 5 s was tested in this study. The effect of the EGR valve control strategy on engine transient performance was examined. The results show that better air-fuel mixing quality can be obtained with the optimized the EGR valve open loop control strategy and the smoke opacity peak decreased more than 64%. Under the EGR valve close loop control strategy; the smoke opacity peak was lower than with open loop control strategy; but higher than without EGR. The effect of fuel injection strategy on engine transient performance was examined with the EGR valve close loop control. The results show that sectional-stage rail pressure (SSRP) strategy (increasing injection pressure from a turning point load to 100% load) and optimizing fuel injection timing can improve the engine emission performance. The satisfactory results can be obtained with lower NOx (382 ppm) emissions and the smoke opacity peak (3.8%), when the turning point load is set to 60% with the injection timing delay 6° CA.

Keywords: diesel engine; transient operation; EGR; injection strategies; optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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