Methods and system for injecting water at different groups of cylinders of an engine

A method, comprising:

• in response to a water injection request:
• during a first operation, injecting water into an intake port of an engine cylinder;
• and
• during a second operation,
• injecting a first amount of water upstream of a first group of engine cylinders and injecting a second amount of water upstream of a second group of engine cylinders, where the first amount is based on a first operating condition of the first group of engine cylinders and the second amount is based on a first operating condition of the second group of engine cylinders;
• adjusting the first amount based on a different, second operating condition of the second group of cylinders;
• and
• adjusting the second amount based on a different, second operating condition of the first group of cylinders.

A system, comprising:

• a first water injector coupled to a common intake manifold of a first group of cylinders;
• a second water injector coupled to a common intake manifold of a second group of cylinders;
• a first set of water injectors, each water injector of the first set coupled to an intake port of a single cylinder;
• and
• a controller including non-transitory memory with computer readable instructions for:
• in response to a request to inject water, selecting a location to inject the water from each of:
• the first water injector and second water injector and the first set of water injectors, where the selection is based on engine load, and where the selecting includes:
• selecting to inject water via the first water injector and the second water injector in response to the engine load being above a threshold load and determining a first amount of water to inject via the first water injector based on a first operating condition of the first group of cylinders and a second amount of water to inject via the second water injector based on a second operating condition of the second group of cylinders;
• and
• selecting to inject water via the first set of water injectors in response to the engine load being below the threshold load.