An injected quantity estimation technique based on time–frequency analysis

Ferrari, Alessandro; Jin, Zhiru; Vento, Oscar; Zhang, Tantan

doi:10.1016/j.conengprac.2021.104910

Cited by 11 publications

(4 citation statements)

References 29 publications

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“…Researchers, employing either experimental or numerical approaches [3,4], are focusing on many aspects of the gasoline engine to improve its performance, by means of the development of new control strategies [5][6][7][8], or by improving the engine hardware, including the fuel injection system [9], the turbocharging/supercharging system, or by means of design strategies like downsizing or downspeeding. Combining turbocharging/supercharging technology with downsizing guarantees that an engine has better power and fuel-economy properties [10].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Gasoline—Water Mixture Fuel Impingement Preparation Method and Spray Characteristics with High Injection Temperatures and Pressures

Ji,

Wu,

Ferrari

et al. 2023

Energies

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Gasoline–water mixed injections are of great interest because of their advantages for reduced manufacturing costs and improved atomization, with the potential to alleviate engine detonation and reduce emissions. In this work, based on the principle of impinging flow, a real-time gasoline–water mixture preparation system for internal combustion engines was designed and the preparation system performance was compared with the standard swirl mixing technique. An image processing method was established to quantify the uniformity of the prepared mixture. Based on the flash-boiling spray flash-boiling spray experiment, the spray characteristics of different gasoline–water mixtures were analyzed under different injection temperatures (30–160 °C) and pressures (5–15 MPa). The experiments showed that the impinging pressure was the main factor affecting the emulsification performance of the real-time gasoline–water mixture, and that the proposed real-time mixing system could produce a stable gasoline–water emulsion. For temperatures in the 30–160 °C range, the flash-boiling spray flash-boiling spray experiments showed that the spray penetration distance first decreases and then increases with the injection temperature, while the spray angle shows an opposite trend. The turning point corresponded to the flash-boiling point of each gasoline–water mixture.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Gasoline—Water Mixture Fuel Impingement Preparation Method and Spray Characteristics with High Injection Temperatures and Pressures

Ji,

Wu,

Ferrari

et al. 2023

Energies

Self Cite

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“…19 The fuel in the tank reaches the injector inlet after the pumping phase, which determines a temperature increment of about 1°C every 100 bar of compression. 20 Concerning the temperature evolution within the injector, it has been often predicted in the literature with an isothermal flow assumption. 21,22 However, with this hypothesis, the temperature rise, due to the viscous dissipation through the injector restrictions and due to the pressure drop, is not simulated.…”

Section: Introductionmentioning

confidence: 99%

Thermal effects on Common Rail injection system hydraulic performance

Ferrari

Vento

2023

International Journal of Engine Research

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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.

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“…16 If the layout of the hydraulic system ensures that the pressure wave propagation occurs along a single direction, a mathematical relation between the measured pressure time history and that of the flowrate can be established for each pipe section. 17 However, if the pressure waves travel back and forth along the pipe, as in the rail-to-injector pipe of a Common Rail system, 18 one pressure signal is not enough for the evaluation of a constitent flowrate time distribution.…”

Section: Introductionmentioning

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

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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.

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An injected quantity estimation technique based on time–frequency analysis

Cited by 11 publications

References 29 publications

Experimental Investigation on Gasoline—Water Mixture Fuel Impingement Preparation Method and Spray Characteristics with High Injection Temperatures and Pressures

Experimental Investigation on Gasoline—Water Mixture Fuel Impingement Preparation Method and Spray Characteristics with High Injection Temperatures and Pressures

Thermal effects on Common Rail injection system hydraulic performance

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

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