An indirect method for the real-time evaluation of the fuel mass injected in small injections in Common Rail diesel engines

Ferrari, Alessandro; Paolicelli, Federica

doi:10.1016/j.fuel.2016.11.053

Cited by 33 publications

(14 citation statements)

References 22 publications

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“…Since L 3 is part of a Helmholtz resonator, no significant flow-rate occurs along this line and the oil flow can be treated as a pure laminar. Therefore, one has f = 64=Re = 64nr 3 A 3 =(G L3 D 3 ), where n ('n 3 ) is the fuel kinematic viscosity, and the space-averaged wall shear stress over L 3 can be modelled, on the basis of equation (14), as follows…”

Section: Model Structurementioning

confidence: 99%

Benchmark between Bosch and Zeuch method–based flowmeters for the measurement of the fuel injection rate

Ferrari

Zhang

2019

International Journal of Engine Research

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Bosch and Zeuch method–based flowmeters use the pressure rise triggered by the injection event in a different way in order to characterize the injected flow-rate time history. These typologies of measurement are the most widely applied to evaluate the injection rate of fuel injection systems. The injection rate of a Common Rail electroinjector has been measured with both Bosch and Zeuch method–based flowmeters. The objective has been to perform a benchmark on these two different flow-rate measuring principles. A slight reduction in the rising slope of the injected flow-rate, an anomalous tail at the end of the injection and a time delay in the flow-rate trace have been observed in the case of the Bosch method measurement. A one-dimensional numerical model of the hydraulic circuit of the flowmeter based on the Bosch method has been developed and validated successfully. This model has then been applied to study the cause and effect relationships between the features of the flowmeter hydraulic circuit and the alteration in the measured injected flow-rate pattern. Design keys for the optimization of the Bosch-based flowmeters are provided, even though the investigation has definitely assessed the superior accuracy of Zeuch method–based flowmeters, at least for the examined working conditions.

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Section: Model Structurementioning

confidence: 99%

Benchmark between Bosch and Zeuch method–based flowmeters for the measurement of the fuel injection rate

Ferrari

Zhang

2019

International Journal of Engine Research

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“…The Bosch CP1H3 three-plunger fuel pump (Bosch, Stuttgart, Baden-Württemberg, Germany) 1 was powered by an EBS677 electrical motor (Jinnuo, Tai'an, Shandong, China) 2 with the rated power of 30 kW. Two opposed-arranged Bosch CRI 2.2 injectors (Bosch, Stuttgart, Baden-Württemberg, Germany) 3 were mounted on the high-ambient-pressure constant-volume chamber 4 , and the chamber was filled with high-pressure nitrogen which was initially stored in the container 5 . During the experiment, fuel was pumped into the common rail pipe 6 so as to generate high rail pressure.…”

Section: Experimental Specificationsmentioning

confidence: 99%

“…Currently, CRS utilizes the rail pressure-time injected fuel metering method, which obtains the injector energizing time, E T , from a related map according to the current rail pressure value and the target injected fuel quantity; the injector is then driven to implement the fuel injection process [4]. Thus, the accuracy and stability of the rail pressure are key to influencing E T and the injected fuel quantity, which also plays a very important role in the cycle-to-cycle variation of the injection process.…”

Section: Introductionmentioning

confidence: 99%

On the Effect of a Rail Pressure Error State Observer in Reducing Fuel Injection Cycle-to-Cycle Variation in an Opposed-Piston Compression Ignition Engine

Zuo

Zhang

et al. 2018

Energies

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Abstract:The fuel injection cycle-to-cycle variation characteristic in an opposed-piston compression ignition engine was investigated experimentally. Based on the optimal Proportion Integration Differentiation (PID) method, a new control method was proposed by utilizing a rail pressure error state observer (OBS) before feedback. Compared with the conventional filtering treatment method, the OBS method was developed to simultaneously account for the flow mass changing and the dynamics of a common rail system, rather than representing the rail pressure state as an average value over a period time. The OBS method was subsequently implemented in the control system to investigate the injection pressure oscillation characteristic and cycle-to-cycle variation of injected fuel quantity. The results show that the present OBS method substantially reduces the injection pressure oscillation, improves response characteristics of the control system, and produces qualitatively satisfactory fuel injection cycle-to-cycle variation in the opposed-piston compression ignition (OPCI) engine.

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“…On the other hand, Tang et al [16], determined that the diameter of the orifice of the nozzle represents an important parameter and at lower diameters, there is a significant increase in the injection rate. In more recent studies Ferrari and Paolicelli [17], proposed a numerical model that allows converting pressure data in instantaneous injection rate; in turn integrating the calculated rate, you get the amount of fuel that enters the injector. With the numerical model, the amount of fuel that enters the injector is greater than the injected measured by a flowmeter, in addition the two masses follow the same trend with respect to parameters such as pressure and time of energized; which allowed them to find a correlation limited to a mass of injected fuel less than 4 mg [18]- [20].…”

Section: 2theoretical-experimental Study Of Injectionmentioning

confidence: 99%

Injection systems in diesel engines and their theoretical-experimental study: a review

Duarte¹,

Orozco²,

Caicedo³

2018

ces

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The injection systems have had a strong evolution in recent years, going from lowpressure system of a mechanical drive to complex high-pressure electronic systems. The electronics applied to this type of systems has allowed handling sequential injections and increasing the injection pressure. In the present work a review of the evolution of the injection systems in the last 20 years is made and how techniques have been developed to model the hydrodynamic behavior of the injectors in Diesel internal combustion engines. With this review, the trends for the modeling of the injection process are visualized, which has an important impact on the thermodynamic modeling and the prediction of the indicator parameters in Diesel internal combustion engines. This review allows to visualize the future development of this type of systems and the implications they have on the performance of internal combustion engines and the thermodynamic modeling of them. The optimization in the operation of diesel engines is possible by improving the operation of injection systems, which has led to more powerful engines but smaller.

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An indirect method for the real-time evaluation of the fuel mass injected in small injections in Common Rail diesel engines

Cited by 33 publications

References 22 publications

Benchmark between Bosch and Zeuch method–based flowmeters for the measurement of the fuel injection rate

Benchmark between Bosch and Zeuch method–based flowmeters for the measurement of the fuel injection rate

On the Effect of a Rail Pressure Error State Observer in Reducing Fuel Injection Cycle-to-Cycle Variation in an Opposed-Piston Compression Ignition Engine

Injection systems in diesel engines and their theoretical-experimental study: a review

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