The little that you know is that the load calculates it based on the air entrance, that is, measurement by MAF or MAP, from there and certain air temperature and refigentant (2 values plus) adding the position of the accelerator pedal already calculates what each injector must open, then there are other variables such as the detonation sensor, which advances or backs down, with which the power Injection (opening time or injection pulse), on all this depends on the Motor, certamente alguém pode explicar tudo isso melhor, se eu estiver errado em nos dizer, então aprendemos melhor. Saudações!!