Patent ID: 6161383
Filing Date: 2000-12-19
Classification: F02B,F02D,F02M,Y02T

Abstract:
A control system for supercharging pressure of a supercharged internal combustion engine having an exhaust gas turbo charger with an actuator for modifying the supercharging pressure, the system comprising:an open-loop control device in an operating path to the actuator, which open-loop control device is assigned at least one basic characteristic curve diagram in which desired values are electronically stored, at least as a function of engine speed (n) and current fuel injection quantity (Me), and are held ready for reading out in order to determine an open-loop control pulse duty factor (TV.sub.S);a closed-loop control device for determining a closed-loop control pulse duty factor (TV.sub.R), which can be fed additively to the operating path, from a desired/actual value comparison of prescribable desired values (P.sub.2des) and determined actual values (P.sub.2act) of the supercharging pressure (P.sub.2act);a changeover device which is arranged between the closed-loop control device and the operating path and uses a fuel injection quantity parameter, which is at least a function of rotational speed, in order to indicate a prescribed change of state between closed-loop control and open-loop control; anda precontrol device for calculating a precontrol pulse duty factor (TV.sub.VO) having a value which is a function of a required desired value of at least one operating parameter of the internal combustion engine and which is fed to the operating path via an adder.