Closed-Loop Combustion Control of a Multi Cylinder HCCI Engine using Variable Compression Ratio and Fast Thermal Management
type: CreativeWork
description: The current Spark Ignited (SI) engine equipped with three-way catalyst offers low emissions, but has low efficiency at part load, which results in unnecessarily high CO2 emissions. The Compression Ignited (CI) engines have higher efficiency and hence lower CO2 emissions, but suffer from higher Nitrogen Oxide (NOx) and Particulate Matter (PM) emissions, and no three-way catalyst can be used. Large efforts are made to reduce the emissions of the CI engine and raise the efficiency of the SI engine. A third internal combustion engine type, which combines the principles of the SI and CI engines, has the potential to meet demands from society in terms of current and foreseeable future emissions regulations. This engine type is called Homogeneous Charge Compression Ignition (HCCI) engine. It utilizes a homogeneous premixed air fuel mixture like the SI engine, but the mixture is compressed to auto ignition like in the CI engine. Very dilute mixtures are used to slow down the combustion rate. This results in a low combustion temperature with extremely low NOx emissions. Due to the homogeneous charge the combustion produces no PM. The Carbon Monoxide (CO) and unburned Hydrocarbon (HC) emissions are, however, higher than for the other engine types due to the low combustion temperature, but an oxidizing catalyst can quite easily treat CO and HC emissions. Combustion control of the HCCI engine is a challenge since there is no direct means to control when combustion starts unlike the SI or CI engines. Combustion phasing in an HCCI engine can be achieved by affecting the time history of pressure and temperature in the cylinder. The most common way to do this in the lab has been to control the inlet air temperature and thereby the temperature in the cylinder at the end of the compression stroke. With an electrical heater this is a slow parameter to control. In the present study a multi cylinder engine equipped with Variable Compression Ratio (VCR) and a Fast Thermal Management (FTM…
abstract: The current Spark Ignited (SI) engine equipped with three-way catalyst offers low emissions, but has low efficiency at part load, which results in unnecessarily high CO2 emissions. The Compression Ignited (CI) engines have higher efficiency and hence lower CO2 emissions, but suffer from higher Nitrogen Oxide (NOx) and Particulate Matter (PM) emissions, and no three-way catalyst can be used. Large efforts are made to reduce the emissions of the CI engine and raise the efficiency of the SI engine. A third internal combustion engine type, which combines the principles of the SI and CI engines, has the potential to meet demands from society in terms of current and foreseeable future emissions regulations. This engine type is called Homogeneous Charge Compression Ignition (HCCI) engine. It utilizes a homogeneous premixed air fuel mixture like the SI engine, but the mixture is compressed to auto ignition like in the CI engine. Very dilute mixtures are used to slow down the combustion rate. This results in a low combustion temperature with extremely low NOx emissions. Due to the homogeneous charge the combustion produces no PM. The Carbon Monoxide (CO) and unburned Hydrocarbon (HC) emissions are, however, higher than for the other engine types due to the low combustion temperature, but an oxidizing catalyst can quite easily treat CO and HC emissions. Combustion control of the HCCI engine is a challenge since there is no direct means to control when combustion starts unlike the SI or CI engines. Combustion phasing in an HCCI engine can be achieved by affecting the time history of pressure and temperature in the cylinder. The most common way to do this in the lab has been to control the inlet air temperature and thereby the temperature in the cylinder at the end of the compression stroke. With an electrical heater this is a slow parameter to control. In the present study a multi cylinder engine equipped with Variable Compression Ratio (VCR) and a Fast Thermal Management (FTM…
author: Haraldsson, Göran
language: eng
keywords: Other Mechanical Engineering, CR, Motorer, framdrivningssystem, Motors and propulsion systems, Teknik, Technological sciences, Closed-Loop Combustion Control, CLCC, Multi cylinder, HCCI, Black box, System identification, State feedback, PID, LQG, Fast Thermal Management, FTM, VCR Variable Compression Ratio
date published: 2005
date modified: 2026-07-24T03:00:02Z
provider: University of Lund
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Division of Combustion Engines, Lund Institute of Technology