Fuel injection timing is an important control parameter for engine combustion optimization and emissions
control. However, the actual fuel injection timing is different from the nominal one commanded by the
electronic control unit, due to the system hydraulic lag or the possible communication malfunction. In this study,
a simple estimate approach based on the injector inlet pressure is proposed to capture four critical characteristic
instants at the start and end of injection. The critical characteristic moments estimated using this pressure-based
approach are validated against those determined by the actual injection rate profiles, in the context of different
single or split injection processes. The comparison revealed that the characteristic injection moments estimated
by the injector inlet pressures and those determined by the actual injection rate profiles have a satisfactory agreement,
certifying the broad applicability and reliability of this pressure-based approach in the detection of the real
fuel injection start and end time.
ZHAI Jiaqi (翟佳琦), DUAN Yaozong (段耀宗), HAN Dong (韩东)
. Pressure-Based Approach to Estimating the Injection Start and End in Single and Split Common Rail Injection Processes[J]. Journal of Shanghai Jiaotong University(Science), 2018
, 23(Sup. 1)
: 28
-33
.
DOI: 10.1007/s12204-018-2019-5
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