Injection quantity control for GDI engines

Abstract

To improve fuel economy and reduce emissions, direct injection technology with precise fuel injections is widely used for gasoline engines, because quantitative precise fuel injection, as well as multi injection during one combustion revolution, is fit for the whole engine speed range. This paper designs a PID controller of fuel injection quantity for gasoline direct injection (GDI). Firstly, a mathematical model of an injector, which is used for controller validation, is established mainly based on fluid dynamic; Secondly, a map of fuel injection quantity corresponding with engine demands (according to engine speed and rail pressure) is calibrated by using the high-fidelity engine software enDYNA through experiments. Then, a PID controller is aimed to track the given value of fuel injection quantity. Tuning controller parameters are chosen by randomized algorithm according to the criteria of performance. Simulation results show that the designed control scheme is effective.

Electric Current Waveform of the Injector as a Source of Diagnostic Information

“…Mathematical models are used to evaluate the system’s efficiency and to detect various kinds of damage. Injectors and fuel systems are modeled in special programming environments, such as Matlab/Simulink, ANSYS, or Amesim [ 18 ], due to which the system’s properties and its functioning during operation [ 6 , 19 , 20 ] are determined. Modeling enables assessing the gasoline injection and determining its most important determinants [ 21 ], as well as evaluating the influence of the design changes on the control result, i.e., the obtained engine power and quality of the combustion process.…”