EXPERIMENTAL-STUDY OF DIESEL-ENGINE CYCLE-TO-CYCLE VARIATION .4.

Marine diesel engine excitation can occur from the cycle-to-cycle vari ation in the engines output. The cycle-to-cycle variation in maximum c ylinder pressure (P(max)) is often used to represent this variation. E arlier studies examined the correlation between the cycle-to-cycle var iation in the maximum cylinder pressure (P(max)), pressure impulse (PI ), and ignition delay (ID), for the case of constant injection setting . Recent studies showed the injection timing strongly affects the cycl e-to-cycle variation. This paper summarizes the results of systematic experiments to determine cycle-to-cycle variation for a single-cylinde r diesel test engine and extrapolation to estimate the cycle-to-cycle variation in a 12-cylinder 925-hp diesel propulsion engine. Comparison of the extrapolated and measured results shows reasonable agreement.