A novel fuel injected mass feedback-control for single and multiple injections in direct injection systems for CI engines

Ferrari, Alessandro; Novara, Carlo; Vento, Oscar; Violante, M.; Zhang, Tantan

doi:10.1016/j.fuel.2022.126670

Cited by 8 publications

(6 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As already presented in the literature, [27][28][29] the mass entering the injector can be used to set up a closed-loop strategy for the injected mass. If the flowrate time history that enters the injector is integrated till it reaches its absolute minimum (cf.…”

Section: Experimental and Numerical Resultsmentioning

confidence: 99%

“…Figure 8 at t ≈ 8 . 5 ms ), a robust correlation between the injected fuel quantity ( M inj ) and the mass that enters the injector during an injection event ( M inj,in ) can be obtained; such a correlation is reported as a continuous line in Figure 12, where the experimental points are plotted with symbols. In previous works 27–29 the mass entering the diesel Common Rail injector, M inj,in , was obtained by ending the integration of the injector inlet flowrate in correspondence to its absolute maximum value. This difference in the method can be ascribed to the fact that, since the GDI injector pressure working range is much smaller than that of a diesel Common Rail injector, the energizing times are generally much longer.…”

Section: Experimental and Numerical Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of a GDI injector with an innovative flowmeter for high-pressure transient flows

Ferrari

Pizzo²,

Vento

2023

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

A new flowmeter for high pressure flows, characterized by intense dynamic events, is presented. The flowmeter algorithm is based on the measurement of two pressure signals along the investigated pipe, and the flowrate is obtained through an ordinary differential equation given by the combination of the continuity and the momentum partial differential equations. This flowmeter has been applied to a GDI injector to monitor the flowrate that enters the injector during an injection event. A 1D numerical model of the GDI injector has been set up and validated, and the numerical outcomes have been used to confirm the consistency of the experimental results obtained from the new flowmeter, for both single and pilot-main injections. The internal dynamics of the injector has also been investigated, using both the 1D numerical tool and the innovative flowmeter. A possible feedback-control strategy has been set up to compensate for any inaccuracy of the injected mass by applying the flowmeter to the hydraulic high-pressure circuit.

show abstract

Section: Experimental and Numerical Resultsmentioning

confidence: 99%

Section: Experimental and Numerical Resultsmentioning

confidence: 99%

Investigation of a GDI injector with an innovative flowmeter for high-pressure transient flows

Ferrari

Pizzo²,

Vento

2023

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Experimental Facilitymentioning

confidence: 99%

“…9 The injected fuel quantity depends on both the time-averaged value of the injection pressure and on the hydraulic duration of the injection, which is related to the electrical command to the solenoid, that is, the energizing time (ET). 28 A piezoresistive transducer has been mounted at the injector inlet along the rail-to-injector pipe to measure the pressure time history (p inj , in ) and this datum will be used as a boundary condition for the numerical model. The transducer measuring range is up to 2000 bar and its linearity error is lower than 60.1% of the full scale value.…”

Section: Experimental Facilitymentioning

confidence: 99%

Thermal effects on Common Rail injection system hydraulic performance

Ferrari

Vento

2023

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

The effect of the fuel temperature on the hydraulic performance of a Common Rail diesel injector has been investigated with an integrated experimental-numerical approach. An experimental campaign pertaining to single and double injections has been performed for fuel tank temperatures ranging from 28°C to 68°C. In general, an augment in the injected mass has been observed for increasing values of the fuel tank temperature. Moreover, the interaction between the main and after injection changes with the temperature and the dwell time threshold for fusion-free injections increases with the fuel temperature. The temperature at the injector nozzle has been measured and compared with that obtained with a thermo-fluid dynamics simple model, showing that the real temperature and the estimated one correlate well. The influence of the fuel temperature on the internal injector dynamic has been explored by means of a validated 1D numerical model of the injector thermo-fluid dynamics. The main direct effect of the temperature variation concerns the needle lift, which reaches a larger peak value for a higher fuel temperature: this explains the general increment in the injected mass and the augmented value of the injection fusion threshold for the main-after injections. The obtained results could allow more accurate open-loop control strategies for the injected mass, which include thermal effects, to be implemented.

show abstract

“…Referring to the Common Rail system, that is the most diffused fuel injection system for diesel engines [26][27][28], it is constituted by a high-pressure rotary pump that feeds the rail, at which four solenoid injectors are connected by means of high-pressure lines [29]. Over one of these pipes the flowmeter has been installed (cf.…”

Section: Experimental Facilitiesmentioning

confidence: 99%

Instantaneous flowrate measurements in high-pressure liquid flows

Ferrari,

Pizzo,

Rundo

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

A new flowmeter suitable for high-pressure flows and with a prompt dynamic response is presented. It is constituted by two pressure transducers installed on the monitored high-pressure pipe at a fixed distance one from the other, together with a low-pressure flowmeter that provides a time-averaged flowrate. The measurement algorithm consists of an ordinary differential equation obtained by combining the mass conservation partial differential equation and the momentum balance one applied to the considered piece of pipe comprised between the two pressure transducers. Due to the absence of a master instrument that can be employed as reference to verify the consistency of the measured flowrate, the flowmeter accuracy has been demonstrated by means of numerical models of various hydraulic components, rigorously validated through pressure measurements. The flow ripple of gear pumps has been measured, as well as the flowrate entering a Common Rail injector. For all these cases, the measured flowrate and the one obtained by means of the numerical model are in very good agreement, leading to a robust validation of the presented measurement device.

show abstract

A novel fuel injected mass feedback-control for single and multiple injections in direct injection systems for CI engines

Cited by 8 publications

References 26 publications

Investigation of a GDI injector with an innovative flowmeter for high-pressure transient flows

Investigation of a GDI injector with an innovative flowmeter for high-pressure transient flows

Thermal effects on Common Rail injection system hydraulic performance

Instantaneous flowrate measurements in high-pressure liquid flows

Contact Info

Product

Resources

About