Abstract:
The invention describes a virtual pressure sensor for a Common Rail injection system of an endothermic engine (1), the injection system comprising at least one fuel pressure accumulating tank, of the rail type, having an input in fluid communication with a high-pressure pump and a plurality of outputs for feeding corresponding injectors (4) by using pressure regulating means connected and depending on an electronic control unit (9). Advantageously in the invention, the virtual pressure sensor includes a fluid-dynamic model of the accumulating tank (2) suitable to estimate and to obtain fluid pressure values used by the electronic control unit (9) for driving the injection means of the Common Rail injection system.
Abstract:
A control system (10) for an electromechanical-braking system (1) provided with actuator elements (2, 5) configured to actuate braking elements (6, 8) for exerting a braking action has a control stage (16) for controlling the braking action on the basis of a braking reference signal (w). The control stage comprises a model-based predictive control block (16), in particular of a generalized predictive self-adaptive control (GPC) type, operating on the basis of a control quantity (F b ) representing the braking action. The control system further has: a model-identification stage (14), which determines parameters (a, b, d) identifying a transfer function (G(z)) of the electromechanical-braking system (1); and a regulation stage (15), which determines an optimal value of endogenous parameters of the control system on the basis of the value of the identifying parameters.
Abstract:
A method is described for controlling fuel injection in an spontaneous ignition engine (1) equipped with an electronically controlled fuel injection system (2) and with an electronic control unit (4) receiving engine quantities comprising the pressure ( P ) in the combustion changer of the engine (1) and closed-loop controlling the fuel injection system (2) on the basis of the pressure ( P ) in the combustion chamber, in which the pressure ( P ) in the combustion chamber is determined as a function of engine kinematic quantities such as the engine speed and the crank angle ( rpm , θ) and of the fuel injection law, which is defined by the quantity of fuel injected ( m c ) and by the crank angle at the start of injection ( SOI ).