火花点火機関のノックに及ぼす混合気濃度不均一の影響

概要

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The fuel concentration and knock intensity were measured in two fuel-supply systems, one being a good mixing case in which a homogeneous mixture was prepared using a carburetor with an inlet pipe, and the other an incomplete mixing case in which fuel was injected into an inlet port. The results showed that the heterogeneity of the mixture concentration greatly affects the occurrence and intensity of knock. Under the condition of an overall equivalence ratio of more than 1.0, the homogeneous mixture easily causes a hard knock because a greater amount of auto-ignitable mixture is prepared and spontaneously burnt. On the other hand, in the lean case of an overall equivalence ratio of 0.8, the heterogeneous mixture has a tendency of knock more than that of the homogeneous one. In particular, in the case of stoichiometry, a knock-free operation at a higher compression ratio can be realized by the heterogeneous mixture without the retardation of ignition timing.
1991-10-25