Investigation of Cyclic Variation of IMEP Under Lean Burn Operation in Spark-Ignition Engine

Combustion characterization of natural gas in a lean burn spark-ignition engine

“…Secondly, in the case of lean burn, a late burn phenomenon is observed at the final stage of combustion, as shown in Figs 1 and 10. This is suggested with the present model and with the model used by Ishii et al [24]. Ishii et al confirmed that it is not a calculation error, as light emission continued to be detected by a sensor located on the cylinder head.…”

Dynamics of cycle-to-cycle variations in a natural gas direct-injection spark-ignition engine

“…Several investigators have examined the CCV in spark ignition, compression ignition, and HCCI engines [27][28][29][30][31][32][33][34][35][36][37][38]. For the conventional spark-ignition engine, the studies revealed that variations occurring mainly in the early combustion stage influenced the CCV of indicated mean effective pressure (IMEP), and any factor which can increase the burning velocity of the mixture will lead to a reduction of the CCV [39][40][41][42][43]. The situation is similar in HCCI engines where the CCV in IMEP also result mainly from variations in the initial stages of combustion.…”

Correlations between cycle-to-cycle variations and combustion parameters of a spark ignition engine

“…Following the local maximum point, as combustion becomes progressively less important comparing to piston motion, the COV versus crank angle curve decreases to reach the second minimum point, which corresponds to the combustion end. Combustion end is quite difficult to determine due to late burning phenomenon [10], but a quite good agreement is obtained between the combustion end determined by different methods and the second minimum point of the COV curve ( Fig. 3).…”