β Scribed by Kazuhisa Mogi; Katsushi Hashizume; Katsuhiko Arisawa; Hideo Kobayashi
No coin nor oath required. For personal study only.
In spark ignition gasoline engines, efforts to improve performance and exhaust emissions have resulted in increased compression ratios and methods of maintaining stoichiometric air fuel ratio even at high engine load. This paper analyzes the pre-ignition phenomena under such tight conditions, and proposes a new method for avoiding pre-ignition.
As a result of the analysis, it was shown that knocking occurred very frequently in the early stage of pre-ignition, which was caused by overheated spark plug or extremely hot combustion chamber deposits. It was also verified that the pre-ignition could be avoided by adding logic to the KCS (knocking control system) for screening high-frequency knocking to detect pre-ignition, and by quickly enriching the charged air fuel mixture after the detection.
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