Abstract
Combustion phase parameters of internal combustion engines are important for closed-loop control of combustion process. As an indirect method for combustion diagnosis, engine surface vibration can be used to extract combustion related information. In this paper, a vibration velocity sensor mounted on the cylinder head was used to detect engine vibration signals. The high components of measured vibration signals are highly related to combustion and distribute in the crank angle area -30~90°. Ensemble Empirical Mode Decomposition (EEMD) method was used to extract combustion induced vibration signals and the feature points on the sixth Intrinsic Mode Function (IMF) can be used to evaluate start of combustion (SOC) and location of 50% mass fraction burn (CA50). The maximum errors of identified SOC and CA50 are 1.1° and 1.4°, respectively.
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