Systems and methods for expediting engine warming

An engine system of a hybrid electric vehicle comprising;

• an intake system coupled to an exhaust system with combustion chambers positioned between the intake system and exhaust system;
• an intake passage of the intake system, upstream of the combustion chambers, configured with an electrically-driven compressor (e-compressor) and a charge-air cooler (CAC) arranged in a path of air flow;
• a recirculation passage coupling a region of the intake passage downstream of the e-compressor to a region of the intake passage upstream of the e-compressor;
• an emissions device arranged in the exhaust system downstream of the combustion chambers;
• and
• a controller configured with computer readable instructions stored on non-transitory memory, the instructions executable by the controller to:
• in response to an engine start request,
• when a manifold charge temperature (MCT) is lower than a threshold temperature, delay combustion at the engine, operate the e-compressor, and flow air through the recirculation passage to heat the air;
• and
• when the MCT is at least equal to the threshold temperature, initiate combustion in the engine.

A method for an engine comprising;

• responsive to an intake manifold temperature falling below a first threshold temperature, activating an electrically-driven compressor (e-compressor) arranged in an intake passage to flow a portion of intake air through the e-compressor more than once via a recirculation passage by opening a recirculation valve of the recirculation passage;
• diverting air around a charge-air cooler (CAC), through a CAC bypass, by opening a bypass valve of the CAC bypass, the CAC also arranged in the intake passage;
• and
• throttling intake air delivered to combustion chambers of the engine by adjusting an opening of a throttle arranged downstream of the e-compressor and CAC in the intake passage and upstream of the combustion chambers.