Pressurized air induction system

A method for a boosted engine, comprising:

• responsive to a tip-in, increasing a boost throttle opening to draw cool compressed air from downstream of a charge air cooler (CAC) into an engine via a boost passage;
• responsive to a tip-out, increasing an air throttle opening to draw ambient air from upstream of the CAC into the engine via an air passage while retaining the compressed air in the boost passage;
• and
• opening the boost throttle following the tip-out based on heat transfer to the compressed air in the duct relative to operator torque demand.

A boosted engine system, comprising:

• an engine;
• a first air intake passage coupled to the engine via a first throttle;
• a second air intake passage housing a pressure relief valve, a compressor located downstream of the valve, and a charge air cooler located downstream of the compressor, the second air intake passage coupled to the engine via a second throttle, the first air intake passage coupled to the second air intake passage upstream of the pressure relief valve;
• an ambient temperature sensor and an ambient humidity sensor coupled to the first air intake passage;
• an accelerator pedal for receiving an operator torque demand;
• and
• a controller with computer-readable instructions stored on non-transitory memory for:
• adjusting an opening of the first throttle relative to the second throttle based on the operator torque demand;
• and
• while operating with the second throttle fully closed, adjusting a timing of opening the second throttle based on a rate of rise in temperature of the compressed air trapped in the second air intake passage.