Systems and methods for a split exhaust engine system

A method for an engine, comprising:

• flowing exhaust gases and non-combusted blowthrough air to an intake passage, upstream of a compressor, via a first exhaust manifold coupled to a first set of exhaust valves;
• flowing only exhaust gases to an exhaust passage via a second exhaust manifold coupled to a second set of exhaust valves;
• adjusting a timing of the first set of exhaust valves to adjust the flow of exhaust gases to the intake passage via the first exhaust manifold in response to a request for increased or decreased exhaust gas recirculation (EGR) to the intake passage;
• and
• adjusting the timing of the first set of exhaust valves to adjust the flow of blowthrough air to the intake passage via the first exhaust manifold in response to a request for increased or decreased blowthrough air to the intake passage.

A method for an engine, comprising:

• for each cylinder of a plurality of engine cylinders:
• while an intake valve and a first exhaust valve of a same engine cylinder are open at a same time, flowing non-combusted blowthrough air through the same engine cylinder and to an intake passage via an exhaust gas recirculation (EGR) passage fluidly coupled with the first exhaust valve;
• while a second exhaust valve of the same engine cylinder is open, flowing only exhaust gases to an exhaust passage fluidly coupled with the second exhaust valve;
• while the first exhaust valve is open, prior to opening the intake valve, flowing exhaust gases to the intake passage via the EGR passage;
• and
• adjusting an amount of valve opening overlap between the intake valve and exhaust valve responsive to each of a desired EGR flow amount to the intake passage and a desired blowthrough air flow amount to the intake passage.