Patent ID: 6523345
Filing Date: 2003-02-25
Classification: F02B,F02D,Y02T

Abstract:
A control system for a variable-geometry turbocharger, wherein an internal combustion engine is connected to a variable-geometry turbocharger (4); said system being characterized by comprising:a first controller (41) supplying a first drive signal (P1) for controlling (30) the geometry of said turbocharger on the basis of at least a first signal pM correlated to flow of the air supplied to the engine (3) by the compressor (6) of said turbocharger (4); a second controller (43) supplying a second drive signal (P2) for controlling (30) the geometry of said turbocharger on the basis of a second signal pT correlated to the pressure of the exhaust gas supplied to the turbine (10) of said turbocharger (4); a third controller (46) supplying a third drive signal (P3) for controlling (30) the geometry of said turbocharger on the basis of a third signal nT correlated to the rotation speed of said turbocharger (4); said first (41), said second (43) and said third (46) controller providing, in use, for respective first (100; 100a), second (200; 200a) and third (300; 300a) operating modes; said turbocharger being controlled alternatively by at least two of said controllers (41,43,46) and control being switched automatically from one controller to another respectively from one operating mode to another.