Knocking Phenomena in a Gasoline Engine with Late-Intake Valve Closing

Paper #:
  • 920381

Published:
  • 1992-02-01
Citation:
Rabia, S. and Korah, N., "Knocking Phenomena in a Gasoline Engine with Late-Intake Valve Closing," SAE Technical Paper 920381, 1992, https://doi.org/10.4271/920381.
Affiliated:
Pages:
8
Abstract:
Engine knock (detonation) is an important phenomenon, as it sets the upper limit of workable thermal efficiency. Detonation onset depends on several constraints which may well be altered by late intake valve closure. This paper examines the detonation characteristics of two valve closing systems; late intake valve closing versus the conventional one, by analyzing experimental results. It was found that there are some differences in the detonation characteristics of late intake valve closing engine system (LIVCES) and the conventional engine system (CES). The LIVCES enhanced detonation, which had to be compensated by advancing the spark timing. A maximum of 12 CA degrees was found to be the average value necessary to avoid detonation at light-loads. At high-loads the spark timing advance of the LIVCES becomes almost the same as that for the CES. Also, the maximum cylinder pressure was found to be less than that in the CES.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Article
2017-03-13
Training / Education
2018-03-26
Technical Paper / Journal Article
2010-10-25
Training / Education
2018-03-27