A control-oriented approach to estimate the injected fuel mass on the basis of the measured in-cylinder pressure in multiple injection diesel engines

Investigation of fuel injection rate identification algorithm based on rail pressure fluctuation characteristics induced by injection

“…Equation (14) shows that the relative fuel injection rate depends mainly on K, which is related to the injection pressure P A and the effective circulation area mA 0 . A more accurate K value can be obtained under high pressure with a long pulse width.…”

“…Researchers have studied the diesel fuel injection quantity to obtain a control algorithm that reduces fuel consumption, emissions and the consistency of each cylinder. In previous studies, 5,13,14 the combustion state in the cylinder was obtained through the cylinder pressure measured in real time during diesel engine operation (the blue line in Figure 2), and used as feedback. The diesel engine control parameters were adjusted in real time to accurately optimise the combustion process.…”

Individual cylinder fuel blend estimation in a dual-fuel engine using an in-cylinder pressure based observer

“…Although usually limited to an average engine AFR every cycle (Franceschi et al, 2007;Ebrahimi et al, 2012), some studies aimed to quantify the contribution of each cylinder on the AFR measured by a single UEGO sensor by modeling the exhaust phenomena and dynamics (Chauvin et al, 2006;Suzuki et al, 2007;Cavina et al, 2010;Wang et al, 2019;Guardiola et al, 2019c). In-cylinder pressure can also be used to estimate the composition of the mixture in the cylinder: in Tunestål and Hedrick (2003); Di Leo (2015); Finesso and Spessa (2015), the authors determine the AFR by an inverse combustion model and in-cylinder pressure reading, while in Guardiola et al (2014); Broatch et al (2015) investigations suggested to use the resonant frequency of the in-cylinder pressure oscillations to estimate the overall trapped mass. Indeed, Luján et al (2016) applied this method on HCCI engines showing its potential for diagnosis and control, as these type of engines use to exhibit high resonance excitation (Guardiola et al, 2018b).…”