A Study on the Performance Improvement of Atkinson Cycle Engine

被引：0

作者：

Feng R. ^{[1
]}

Fu J. ^{[2
]}

Yang J. ^{[1
,2
]}

Zhang W. ^{[1
]}

Huang X. ^{[1
]}

Chen Y. ^{[1
]}

机构：

[1] Key Laboratory of Manufacture and Test Techniques for Automobile Parts, Ministry of Education, Chongqing University of Technology, Chongqing

[2] Research Center for Advanced Powertrain Technology, Hunan University, Changsha

来源：

Qiche Gongcheng/Automotive Engineering | 2017年 / 39卷 / 05期

关键词：

Atkinson cycle; Bench test calibration; Brake specific fuel consumption; Compression ratio;

D O I：

10.19562/j.chinasae.qcgc.2017.05.004

中图分类号：

学科分类号：

摘要：

In this paper, an Otto cycle gasoline engine is converted to an Atkinson cycle engine for hybrid electric vehicles with a method combining theoretical calculation, structure and parameters modification and experimental calibration. First of all, compression ratio (CR) is increased from 10.5 to 13 by reducing the volume of recess in piston crown for compensating the effective CR drop caused by the delayed close of induction valve in Atkinson cycle. Then, both intake and exhaust cam profiles are redesigned using AVL Excite Timing Drive software to meet the requirements of modified Atkinson cycle engine. Finally, parameters such as excess air coefficient, valve timing and ignition timing in the universal characteristics map of Atkinson cycle engine are calibrated by engine bench tests. Test results show that on the premise of meeting power performance requirements, the overall specific fuel consumption of modified Atkinson cycle engine is much lower than that of original Otto cycle engine in particular in medium-low speed and medium-high load regions. In addition, the low-fuel consumption region of modified Atkinson cycle engine is much larger than that of original Otto cycle engine, with its location moving toward low-speed/low-load area. The minimum brake specific fuel consumption is reduced from 250g/(kW·h) in original Otto cycle engine to 234.5g/(kW·h) in modified Atkinson cycle engine, meeting the objective requirements. © 2017, Society of Automotive Engineers of China. All right reserved.

引用

页码：509 / 516

页数：7

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