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Research Papers: Internal Combustion Engines

Effects of Key Factors on the Engine Combustion Mode Switching Between HCCI and SI

[+] Author and Article Information
Tian Guohong

State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China; University of Birmingham, Edgbaston, Birmingham B15 2TT, UKg.tian@bham.ac.uk

Wang Zhi, Shuai Shijin

State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China

Wang Jianxin

State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, Chinawangjx@tsinghua.edu.cn

Hongming Xu

 University of Birmingham, Edgbaston, Birmingham B15 2TT, UK

J. Eng. Gas Turbines Power 131(1), 012803 (Nov 20, 2008) (8 pages) doi:10.1115/1.2979003 History: Received July 10, 2007; Revised June 30, 2008; Published November 20, 2008

A technical strategy for a rapid and smooth switching between spark ignition (SI) mode and homogeneous charge compression ignition (HCCI) mode on a gasoline direct injection engine has been proposed and investigated, which involves an electrohydraulic two-stage cam profile mechanism and special injection strategies. The key factors that affect the HCCI/SI mode switching processes were analyzed on the basis of transient engine tests in terms of combustion parameters and exhaust emissions. It is shown that special care should be taken on the engine functionalities during the mode switching from SI to HCCI, which appears to be more difficult, and simultaneous control of the key parameters such as injection mass, injection timing, and spark timing is required. Various strategies and their general criteria for the mode switching were discussed. An optimized combination of selected control strategies has been demonstrated with a satisfactory switching process completed in ten engine cycles, without any abnormal combustion cycles in between.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Cam profiles for the HCCI and SI modes

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Figure 2

SI/HCCI stepped switching

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Figure 3

Mode switching from HCCI to SI

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Figure 4

Pressure trace from HCCI to SI

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Figure 5

Failed switching from SI to HCCI

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Figure 6

SI to HCCI switching without optimization

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Figure 7

SI to HCCI switching with different injection masses

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Figure 8

Intake pressure trace of SI to HCCI switching

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Figure 9

SI to HCCI switching with synchronized throttle opening

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Figure 10

Pressure traces of the first HCCI cycle for different injection timings

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Figure 11

Combustion properties of the first HCCI cycle for varied injection timing

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Figure 12

Switching process for different spark timings

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Figure 13

The eighth HCCI cycle after switching with different spark timings

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Figure 14

The first HCCI cycle for different spark timings

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Figure 15

NOx and exhaust temperature with different spark timings

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