What is the term for the method where fuel injectors open just before the intake valve for their respective cylinders?

The term referring to the method where fuel injectors open just before the intake valve for their respective cylinders is known as sequential multi-port fuel injection. This approach allows for more precise control of the fuel-air mixture being injected into each cylinder. By timing the injection so that it occurs just prior to the intake valve opening, it enhances fuel atomization and helps ensure that the fuel is mixed optimally with air, which can lead to improved combustion efficiency and engine performance.

This method differs from others, such as throttle body fuel injection, where fuel is injected into a single point rather than directly into each cylinder. Central fuel injection and carburetor spray injection also operate under different principles and configurations, making them less effective in achieving the specific advantages offered by sequential multi-port fuel injection. Therefore, the focus on timed, cylinder-specific injection makes sequential multi-port fuel injection the correct term for the method in question.