Abstract
Thermal efficiency of gasoline engines is quite important to prevent the global warming. One of the gasoline engine’s disadvantages is cycle-by-cycle variations, which induce trace-knock at the high speed combustion cycles. Our latest turbulence combustion calculation code already has cycle-by-cycle variation model and chemical reaction calculation for auto ignition prediction, and it was able to simulate trace-knock phenomena. The ignition timing of knock-limitation, however, was not able to be estimated. Therefore, the knock-limitation, which is judged by ears of the experimenters, has been expressed numerically through this study. And it can be used for judging the trace-knock in our calculation. The details of the trace-knock detection concept are described in this paper, and its validity is discussed here.
