Continuously proportional variable geometry turbocharger system and method of control

A system for performing closed loop control of a variable geometry turbocharger (VGT) utilized in an internal combustion engine, comprising:

• VGT actuator means for changing the geometric configuration of said VGT in response to an actuator control signal;
• sensor means for detecting selected engine operating parameters including a VGT actuator parameter and an engine intake manifold parameter, and generating output signals representative thereof;
• means for outputting a target VGT actuator parameter value and a target intake manifold parameter value based on the values of selected sensor means output signals;
• means for determining whether said engine is in a steady state or a transient state of operation based on the values of selected sensor means output signals;
• and
• means for developing an actuator control signal based on one of said target parameter values as a function of the determined engine operating state.