Topic
Spark-ignition engine
About: Spark-ignition engine is a research topic. Over the lifetime, 4352 publications have been published within this topic receiving 66550 citations.
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01 Mar 2011TL;DR: In this article, it is shown that a spark timing of a spark plug is shifted from a point set in a normal state on a retard side with respect to a compression top dead center, farther toward the retard side.
Abstract: When a maximum value of vibration intensity (maximum vibration intensity) (Vmax) acquired from a vibration sensor ( 33 ) in a low engine speed/high engine load (operating region (R)) is equal to or greater than a given threshold value (X), a spark timing of a spark plug ( 16 ) is shifted from a point set in a normal state on a retard side with respect to a compression top dead center, farther toward the retard side. Then, when a maximum vibration intensity (Vmax 2 ) acquired after the spark timing retard is greater than a maximum vibration intensity (Vmax 1 ) acquired before the spark timing retard, it is determined that preignition occurs. This technique makes it possible to reliably detect preignition using the vibration sensor, while distinguishing the preignition from knocking. An in-cylinder pressure sensor for detecting an in-cylinder pressure of an engine may be used to determine the presence or absence of the preignition, in the same manner.
54 citations
TL;DR: In this paper, the effects of water injection on the in-cylinder pressure and heat-release rate of a Rotax 914 engine with kerosene and water injection were investigated.
54 citations
TL;DR: In this paper, a dual injection system, wherein n-butanol and gasoline can be injected separately in any ratio has been employed in a spark ignition engine, which results in good vaporization of the fuels even at low load conditions.
54 citations
20 Apr 2009
54 citations
TL;DR: In this paper, the mean velocity and turbulence intensity measured in a motored research engine were used to predict the decay of turbulence at a point in the flow after the production phase is completed.
Abstract: Laser Doppler velocimeter results are presented for the mean velocity and turbulence intensity measured in a motored research engine. The compression of complex bulk motions created during induction produces turbulence as the piston approaches top dead center. The turbulence field is shown to be isotropic but nonhomogeneous. A zero-dimensional computer simulation based on an averaged k-epsilon model is shown to adequately predict the decay of turbulence at a point in the flow after the production phase is completed. Cylinder pressure measurements were recorded for homogeneous stoichiometric combustion for a range of engine speeds and ignition locations. A two-zone (burned and unburned gases) thermodynamic model accurately predicts the measured pressure histories when the turbulence results determined from the motored tests are used to establish initial conditions for the combustion model.
54 citations