Systems and methods for controlling boost during an engine cold start

A system for increasing an engine load of an engine, the system comprising:

• an electric machine configured to operate as a generator for the engine;
• a battery coupled to the electric machine, the battery configured to accept charge generated by the electric machine;
• an electric boosting device coupled to the battery, the electric boosting device configured to draw charge from the battery;
• a controller storing instructions in non-transitory memory, the instructions executable by a processor to, during a cold start of the engine:
• determine an available capacity of the battery and a first charge to be generated by the electric machine;
• and
• responsive to the available capacity of the battery being less than the first charge:
• increase the engine load by a first amount by operating the electric machine,
• generate the first charge with the electric machine,
• charge the battery with the first charge while the electric boosting device draws a second charge from the battery such that a boost pressure is generated by the electric boosting device, the second charge being less than the first charge, and
• adjusting the boost pressure to compensate the first amount of the engine load.

A method for an engine cold start, the method comprising:

• operating an electric machine to increase an engine load such that a charge is generated by the electric machine;
• charging a battery with the generated charge while powering an electric boosting device via the battery such that a boost pressure is generated;
• determining a target boost pressure;
• and
• adjusting the generated boost pressure to match the target boost pressure.