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TECHNICAL PAPERS: Internal Combustion Engines

Experimental and Computational Studies on Gasoline HCCI Combustion Control Using Injection Strategies

[+] Author and Article Information
Zhi Wang

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

Jian-Xin Wang

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

Shi-Jin Shuai, Guo-Hong Tian, Xin Liang An

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

J. Eng. Gas Turbines Power 129(3), 870-876 (Feb 21, 2006) (7 pages) doi:10.1115/1.2227030 History: Received November 02, 2005; Revised February 21, 2006

Homogeneous Charge Compression Ignition (HCCI) has challenges of ignition control. In this paper, HCCI ignition timing and combustion rate were controlled by two-stage direct injection (TSDI) strategies on a four-stroke gasoline HCCI engine. TSDI strategy was proposed to solve the two major problems of HCCI application-ignition control and load extension. Both simulation and experiments were carried out on a gasoline HCCI engine with negative valve overlap (NVO). An engine model with detailed chemical kinetics was established to study the gas exchange process and the direct injection strategy in the gasoline HCCI engine with TSDI and NVO. Simulation results were compared with experiments and good agreement was achieved. The simulated and experimental results provided a detailed insight into the processes governing ignition in the HCCI engine. Using TSDI, the fuel concentration, temperature as well as chemical species can be controlled. The effects of different injection parameters, such as split injection ratio and start-of-injection (SOI) timing, were studied. The experimental results indicate that, two-stage direct injection is a practical technology to control the ignition timing and combustion rate effectively in four-stroke gasoline HCCI engines. Both the high load and low load limits of HCCI operation were extended.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Injection strategies of HCCI engines with NVO

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Figure 2

Combustion system layout

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Figure 3

Comparison of cylinder pressure: (a) motoring case, (b) HCCI case

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Figure 4

Calculated cylinder pressure and heat release rate of HCCI combustion using three injection strategies (Tin=300K,pin=0.1MPa,n=1400rpm,gb=15.5mg)

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Figure 5

Calculated main species and working process of the HCCI engine using three injection strategies

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Figure 6

Calculated cylinder temperature and pressure curves with different additives

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Figure 7

Effects of injection strategies on ignition

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Figure 8

Effects of split injection ratio on combustion

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Figure 9

Effect of preinjection timing during NVO on combustion charateristics

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Figure 10

Influence of preinjection timing on emissions

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Figure 11

Injection strategies adjusted with load; (a) pressure curve, (b) load versus fuel consumption

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