Patent ID: 8443601

Claim:
Method for controlling the wastegate ( 16 ) in an internal combustion engine ( 1 ) turbocharged by means of a turbocharger ( 12 ); the control method comprises the steps of: determining, during a design phase, a control law (CL) which provides an objective opening of a controlling actuator ( 35 ) of the wastegate ( 16 ) according to the supercharging pressure (P); determining an objective supercharging pressure (P obj ); measuring an actual supercharging pressure (P); determining a first open loop contribution (WG OL ) of an objective position (WG obj ) of the controlling actuator ( 35 ) of the wastegate ( 16 ) through the control law (CL) and according to the objective supercharging pressure (P obj ); determining a second closed loop contribution (WG CL1 ) of the objective position (WG obj ) of the controlling actuator ( 35 ) of the wastegate ( 16 ); calculating the objective position (WG obj ) of the controlling actuator ( 35 ) of the wastegate ( 16 ) by adding the two contributions (WG OL , WG CL1 ); and controlling the controlling actuator ( 35 ) of the wastegate ( 16 ), so as to pursue the objective position (WG obj ) of the controlling actuator ( 35 ) of the wastegate ( 16 ); the step of determining the second closed loop contribution (WG CL1 ) further includes the steps of: determining a virtual position (WGF) of the controlling actuator ( 35 ) of the wastegate ( 16 ) through the control law (CL) and according to the actual supercharging pressure (P); calculating a position error (ε WG ) by determining the difference between the first open loop contribution (WG OL ) of the objective position (WG obj ) of the controlling actuator ( 35 ) of the wastegate ( 16 ) and the virtual position (WGF) of the controlling actuator ( 35 ) of the wastegate ( 16 ); and determining the second closed loop contribution (WG CL1 ) by processing the position error (ε WG ) by means of a first regulator ( 44 ) which tries to nullify the position error (ε WG ).