by SAE International in United States
Ion current sensors have high potential utility for obtaining feedback signals directly from the combustion chamber in internal combustion engines. This paper describes experiments performed in a single-cylinder optical engine operated in HCCI mode with negative valve overlap to explore this potential. A high-speed CCD camera was used to visualize the combustion progress in the cylinder, and the photographs obtained were compared with the ion current signals. The optical data indicate that the ions responsible for the chemiluminescence from the HCCI combustion have to be in contact with the sensing electrode for an ion current to start flowing through the measurement circuit. This also means that there will be an offset between the time at which 50% of the fuel mass has burned and 50% of the ion current peak value is reached, which is readily explained by the results presented in the paper. In addition the results show that the ion current sensor generates good combustion phasing signals for HCCI combustion with negative valve overlap at low engine speeds and low engine loads, provided…
Annotation ability available
This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Chalmers University of Technology-Martin Larsson, Ingemar Denbratt
Volvo Car Corporation-Lucien Koopmans
by Society of Automotive Engineers of Japan in Japan
Developing more sensitive controls for internal combustion engines to meet increasingly strict emission limits is becoming an urgent task, especially for automotive engines. Pressure-sensing systems could be important components of such controls, especially since recent advances have reduced their costs, and increased both their durability and the available options. For these reasons three different types of pressure sensor (one piezo-resistive, one fiber optic and one gasket-type) were installed and evaluated in a single-cylinder SI engine, using a water-cooled piezoelectric pressure sensor as a reference system. In addition, heat release analysis and pressure ratio management strategies were explored to compare the potential utility of different combustion-phasing measures. This paper describes the key findings and discusses their implications.
A list of downloadable items.
Please Wait. Loading Available Formats...
This modal will allow the user to download citation information or export specific fields of data into one of three file formats: Excel, comma-separated values, or text.
Sorry, this document is already saved to a project folder.
Share this content via social media.
Share Via Email
Email sent successfully!
Use this modal to save a search.
The current search and criteria have already been saved. Please modify your criteria to save as a new search.
Request Sent successfully!
Search Tips: Search Operators:AND, OR, NOT; Wild Cards; Using Quotes
SAE MOBILUS® Search Tips
Please note: All terms not contained within quotes, will be evaluated using the OR operator. This means that your search results will contain all results that contain ANY of the entered terms.
AND, OR, NOT
SAE MOBILUS supports the use of the AND, OR and NOT BOOLEAN operators ONLY function with the Advanced Search.
Using the asterisk, ( * ) allows you to search for a partial word. For example, entering a keyword search of aero* will search for any word beginning with aero.
Using the question mark, ( ? ) allows you to search for a word with a single character wildcard. For example, searching for t?re would match both tire and tyre
Words in double quotes " " are treated as a phrase. Conducting a search for "heat model" will return all results in which the exact phrase "heat model" is found, while "heat modeling" would NOT be included.
A term combined with a phrase will be joined with an OR operator.
Searching for Standards
When searching for a standard please use the entire Document Number assigned, which includes the abbreviation. A space can be used, or omitted between the abbreviation and number.