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Transient Control of HCCI Through Combined Intake and Exhaust Valve Actuation
KTH, Superseded Departments, Machine Design.
KTH, Superseded Departments, Machine Design.
KTH, Superseded Departments, Machine Design.ORCID iD: 0000-0002-7550-3134
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2003 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Homogeneous Charge Compression Ignition, HCCI, has the attractive feature of low particulate emission and low Nitrogen Oxides, NOx, emission combined with high efficiency. The principle is a combination of an Otto and a Diesel engine in that a premixed charge is ignited by the compression heat.

Place, publisher, year, edition, pages
2003. Vol. 01-3172
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-6041OAI: oai:DiVA.org:kth-6041DiVA: diva2:10625
Conference
SAE Powertrain & Fluid Systems Conference & Exhibition
Note

QC 20100629

Available from: 2006-08-09 Created: 2006-08-09 Last updated: 2012-10-24Bibliographically approved
In thesis
1. Control of HCCI by aid of Variable Valve Timings with Specialization in Usage of a Non-Linear Quasi-Static Compensation
Open this publication in new window or tab >>Control of HCCI by aid of Variable Valve Timings with Specialization in Usage of a Non-Linear Quasi-Static Compensation
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This doctoral thesis is about controlling the combustion timing of the combustion concept Homogeneous Charge Compression Ignition, HCCI, by means of variable valve timings.

The HCCI research usually is regarded to have started in Japan during the later part of the 1970´s. The world of HCCI has since grown and HCCI is of today researched worldwide. Of particular interest from a Swedish point of view is that Lund Institute of Technology has emerged as one of the world leading HCCI laboratories.

The idea with HCCI is to combine the Otto and Diesel engine. As in an Otto engine the charge is premixed but as in a Diesel engine the operation is unthrottled and the compression heat causes the ignition. The combustion that follows the ignition takes place homogeneously and overall lean. The result is ultra low NOx and particulate emissions combined with high total efficiency. A difficulty with the HCCI-concept is that it only works in a narrow area and that there is no direct way to control the Start Of Combustion, SOC. Out of this follows that timing/phasing of the combustion is one of the main difficulties with HCCI combustion concepts. This is particularly emphasized during transient operation and calls for feedback control of the combustion timing.

This work investigates one method, the variable valve timing, to achieve feedback control of the combustion phasing. From the work it can be concluded that the variable valve timing can control the combustion phasing during engine transients. In order to improve the performance a non-linear compensation from ignition delay to valve timings has been suggested, incorporated in a control structure and tested in engine test. The engine test has been performed in a single cylinder engine based on a Scania truck engine. The speed range from 500 to 1750 rpm and the load range 1.26 and 10.5 bar of netIMEP has been covered with fair transient performance.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006
Series
Trita-MMK, ISSN 1400-1179 ; 2006:06
Keyword
HCCI, Homogeneous, Charge Compression Ignition, Engine Control, Variable Valve Timings
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:kth:diva-4070 (URN)
Public defence
2006-09-04, F3, KTH, Lindstedsvägen 26, Stockholm, 14:00
Opponent
Supervisors
Note
QC 20100629Available from: 2006-08-09 Created: 2006-08-09 Last updated: 2010-06-29Bibliographically approved

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