Notes on 'A methodology for combustion detection in diesel engines through in-cylinder pressure derivative signal'

摘要

The recent paper by Lujan et al. [1 ] considers methods for analyzing the instant variation of the combustion chamber pressure, directly obtained from the electric signal provided by a traditional piezoelectric sensor. The authors claim to have introduced a new alternative for signal processing that, in opposition to the commercial conditioner, directly measures the intensity in the piezoelectric sensor throughwhere R is a resistor connected to a current-to-voltage converter circuit, k the sensitivity of the sensor and dP/dt the in-cylinder pressure derivative. Thus, the authors proposed the use of a current-to-voltage converter circuit to obtain an electrical signal proportional to the derivative of the pressure, as can be seen on Fig. 2 of the paper by Lujan et al. [1 ].