Apparatus and method of controlling engine system

A control apparatus of an engine system, the engine system including an engine, a variable geometry turbocharger having a turbine and a compressor and configured to control a boost pressure applied to the engine by adjusting an angle of a vane provided in the turbine, and an exhaust gas recirculation (EGR) valve configured to control an amount of an exhaust gas recirculated to the engine, the control apparatus comprising:

• an electronic controller;
• and
• a nontransitory computer readable medium having electronic controller configuring instructions comprising:
• an EGR valve controller configured to calculate a target EGR mass flow rate based on a target boost pressure and a target intake air amount and determine an EGR valve opening rate according to the calculated target EGR mass flow rate, and operatively connected to the EGR valve for controlling the EGR valve according to the determined EGR valve opening rate;
• and
• a turbocharger controller configured to perform a sliding mode control using the target EGR mass flow rate calculated based on the target boost pressure as a parameter to calculate a target compressor power and a target turbocharger mass flow rate and determine a turbine vane opening rate according to the calculated turbocharger mass flow rate, and operatively connected to the variable geometry turbocharger for adjusting the angle of the turbine vane according to the determined turbine vane opening rate,
• wherein the target boost pressure and the target intake air amount is determined based on an engine speed and a fuel injection amount.