A study on combustion control by using internal and external EGR for HCCI engines fuelled with DME

Tetsuo Ohmura, Masato Ikemoto, Norimasa Iida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Citations (Scopus)

Abstract

The Homogeneous Charge Compression Ignition (HCCI) engine is possible to achieve high thermal efficiency and low emissions. One of the main challenges with HCCI engines is structuring the systems to control combustion phasing, crank angle of 50% heat release (CA50), for keeping high thermal efficiency and avoiding an excessive rate of pressure rise which causes knocking, when operating conditions vary. Though some HCCI combustion control systems, for example Variable Valve Timing System and Variable Compression Ratio System, have been suggested, these control systems are complex and heavy. In this study, for the development of a lightweight and small-sized generator HCCI engine fuelled with Dimethyl Ether (DME) which is low-emission and easy to autoignite, a simple HCCI combustion control system is suggested, and the control system is evaluated experimentally. In the control system, the means of controlling gas temperature at inlet valve closure (IVC) is focused on to control CA50 as the specific autoignition temperature of a fuel is constant in HCCI combustion. The amount of premixture of air and fuel at stoichiometric ratio necessary to achieve load is fixed, and gas temperature at IVC is controlled by changing the mixing ratio of hot (internal) EGR gas and cold (external) EGR gas. And also cold EGR gas plays a role in the avoidance of a very rapid combustion reaction speed. The exhaust cam has two stages to use hot EGR gas, and exhaust gas is cooled through the heat exchanger to use cold EGR gas. The mixing ratio of three gases, stoichiometric premixture, hot EGR gas and cold EGR gas, is controlled by four throttles placed in the flow path of these gases. As input heat quantity per cycle greatly affects CA50, the change in input heat quantity per cycle needs to be considered to control CA50 by gas temperature at IVC. In the control system, the measured IMEP has the slow response and vibrates to the IMEP set value. Meanwhile, the CA50 controller shows the good performance in aspects of steady and transient characteristics. Hereafter, the IMEP controller should be improved without reducing the performance of the CA50 controller.

Original languageEnglish
Title of host publicationSAE Technical Papers
PublisherSAE International
DOIs
Publication statusPublished - 2006 Nov 13
EventSAE 2006 Small Engine Technology Conference and Exhibition, SETC 2006 - San Antonio, United States
Duration: 2006 Nov 132006 Nov 16

Other

OtherSAE 2006 Small Engine Technology Conference and Exhibition, SETC 2006
CountryUnited States
CitySan Antonio
Period06/11/1306/11/16

Fingerprint

Ignition
Ethers
Engines
Gases
Control systems
Controllers
Temperature
Cams
Exhaust gases
Heat exchangers
Hot Temperature

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

Cite this

A study on combustion control by using internal and external EGR for HCCI engines fuelled with DME. / Ohmura, Tetsuo; Ikemoto, Masato; Iida, Norimasa.

SAE Technical Papers. SAE International, 2006.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ohmura, T, Ikemoto, M & Iida, N 2006, A study on combustion control by using internal and external EGR for HCCI engines fuelled with DME. in SAE Technical Papers. SAE International, SAE 2006 Small Engine Technology Conference and Exhibition, SETC 2006, San Antonio, United States, 06/11/13. https://doi.org/10.4271/2006-32-0045
Ohmura, Tetsuo ; Ikemoto, Masato ; Iida, Norimasa. / A study on combustion control by using internal and external EGR for HCCI engines fuelled with DME. SAE Technical Papers. SAE International, 2006.
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