By Giovanni Fiengo, Alessandro di Gaeta, Angelo Palladino, Visit Amazon's Veniero Giglio Page, search results, Learn about Author Central, Veniero Giglio,
Progressive discounts in motor vehicle emission necessities have pressured the car to speculate in examine and improvement of other keep an eye on innovations. continuous regulate motion exerted by means of a devoted digital regulate unit guarantees that most sensible functionality by way of pollutant emissions and gear density is married with driveability and diagnostics. fuel direct injection (GDI) engine expertise is the way to reach those ambitions.
This short describes the functioning of a GDI engine outfitted with a standard rail (CR) approach, and the units essential to run test-bench experiments intimately. The textual content may still turn out instructive to researchers in engine keep an eye on and scholars are instructed to this short as their first method of this expertise. Later chapters of the short relate an cutting edge process designed to help with the engine administration method; injection strain law for gasoline strain stabilization within the CR gas line is proposed and tested by means of test. The ensuing regulate scheme consists of a suggestions indispensable motion and a static model-based feed-forward motion, the earnings of that are scheduled as a functionality of basic plant parameters. The tuning of closed-loop functionality is supported via an research of the phase-margin and the sensitivity functionality. Experimental effects make certain the effectiveness of the regulate set of rules in regulating the mean-value rail strain independently from engine operating stipulations (engine velocity and time of injection) with restricted layout effort.
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Additional info for Common Rail System for GDI Engines: Modelling, Identification, and Control
To obtain this goal a closed loop control must regulate the average of fuel pressure into the rail so to mitigate unavoidable negative effects that the motion of three lobes mechanical pump and multiple injections can have on it. In order to assist the Engine Management System design, through a better performance of GDI engine and the common rail system, in this chapter we present the synthesis and experimental validation of a model-based gain-scheduling controller aimed to regulate the fuel pressure and to track demanded pressure trajectories.
Therefore, to avoid discrepancies between model and experiments, δ is considered saturated in the interval [−b/a, 100−b a ] instead of [0, 100] as in the ideal case. 3) into Eq. 5) is the steady response of the current as function of δ (control variable) and Vb (not manipulable input) as well. A measurement of the battery voltage variable is usually available in the Electronic Central Unit (ECU) and its value used by controllers to quickly adapt main control maps depending on it. 5) and electrovalve with actuation circuit in different steady working conditions is confirmed in Fig.
6) as function of the electrovalve current and HP pump speed is drawn in Fig. 8. We note that the static pressure is satisfactorily explained by the model up to 80 bar, while for higher values predictive capabilities gets worse. Indeed, pressure slightly deviates from its linear behavior at low current values (see also Fig. 5) where the fuel flow is mostly chocked by the electrovalve. 6), but we prefer to keep the model linear with respect to the state variable i assuming that model mismatches at highest pressure will be compensated via feedback controllers.
Common Rail System for GDI Engines: Modelling, Identification, and Control by Giovanni Fiengo, Alessandro di Gaeta, Angelo Palladino, Visit Amazon's Veniero Giglio Page, search results, Learn about Author Central, Veniero Giglio,