| 张光攀,陆海峰,李超,晁岳栋,李理光.进气VVT对低压EGR汽油机油耗影响研究[J].内燃机工程,2017,38(5):104-107. |
| Effects of Intake VVT on Fuel Consumption of a Gasoline Engine with Low Pressure EGR |
| DOI： |
| Key Words:intake VVT EGR combustion port fuel injection gasoline |
| Author Name | Affiliation | | ZHANG Guangpan ,LU Haifeng ,LI Chao ,CHAO Yuedong ,LI Liguang | 1.School of Automotive Studies,Tongji University,Shanghai 201804,China
2.Chinese Deutsches Hochschulkolleg,Tongji University,Shanghai 200092,China |
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| Abstract:The effects of intake VVT on the BSFC and combustion characteristics of a gasoline engine with low pressure EGR were studied based on a port fuel injection gasoline engine of small displacement with a low pressure EGR system. Results show that the smaller the EGR rate, the greater the pump loss, and when the EGR rate is small, the variation of the pump loss with EGR rate is also small, and vice versa; besides, the pump loss decreases when the intake valve open time is advanced or retarded. At 1850 r/min and 0.45 MPa, when the intake valve open timing is set at 10° and 28° before TDC, as well as 24° after TDC, the pump loss decreases by 2.3%, 11.9% and 18.8% respectively; when the open timing is advanced to before TDC or lagged behind after TDC with higher EGR, the combustion duration and ignition delay increases and the BSFC decreases. The lowest BSFC is 283.44 g/(kW•h) achieved by the optimization of the EGR rate and intake valve open timing, and it decreases by 3.8% compared with the original one of 294.49 g/(kW•h). |
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