A Study of Newly Developed HCCI Engine With Wide Operating Range Equipped With Blowdown Supercharging System

Event
SAE International Powertrains, Fuels and Lubricants Meeting
Authors Abstract
Content
To extend the operating range of a gasoline HCCI engine, the blowdown supercharging (BDSC) system and the EGR guide were developed and experimentally examined. The concepts of these techniques are to obtain a large amount of dilution gas and to generate a strong in-cylinder thermal stratification without an external supercharger for extending the upper load limit of HCCI operation whilst keeping dP/dθmax and NOx emissions low. Also, to attain stable HCCI operation using the BDSC system with wide operating conditions, the valve actuation strategy in which the amount of dilution gas is smaller at lower load and larger at higher load was proposed. Additionally to achieve multi-cylinder HCCI operation with wide operating range, the secondary air injection system was developed to reduce cylinder-to-cylinder variation in ignition timing. As a result, the acceptable HCCI operation could be achieved with wide operating range, from IMEP of 135 kPa to 580 kPa. Compared to conventional SI operation, BSFC was improved by 14% ~ 35% with more than 99% reduction in NOx emissions.
Meta TagsDetails
DOI
https://doi.org/10.4271/2011-01-1766
Pages
16
Citation
Kuboyama, T., Moriyoshi, Y., Hatamura, K., Takanashi, J. et al., "A Study of Newly Developed HCCI Engine With Wide Operating Range Equipped With Blowdown Supercharging System," SAE Int. J. Engines 5(2):51-66, 2012, https://doi.org/10.4271/2011-01-1766.
Additional Details
Publisher
Published
Aug 30, 2011
Product Code
2011-01-1766
Content Type
Journal Article
Language
English