Secondary throttle control systems and methods

An engine system, comprising:

• a first throttle valve;
• a turbocharger compressor disposed downstream of the first throttle valve;
• a charge air cooler disposed downstream of the turbocharger compressor;
• a second throttle valve located downstream of the turbocharger compressor;
• a purge inlet located downstream of the first throttle valve and configured to introduce fuel vapor from a fuel tank into intake air;
• and
• an engine control module that includes a model predictive control (MPC) module configured to, using model predictive control, control the first throttle valve, the second throttle valve, and the turbocharger compressor, the control including:
• maintaining the first throttle valve in a fully open position;
• and
• selectively closing the first throttle valve from the fully open position in response to receipt of a request to purge the fuel vapor from the fuel tank.