The Engine Control Module (ECM) is used principally to regulated the air mass, fuel and ignition timing.
Trionic monitors ionization rates at each spark plug to individually control and adjust the combustion process for each cylinder.
Other primary functions are: Trionic 8 calculates how much power the driver wants as early as possible to avoid turbo kick or lag, therefore making driving smooth.
The torque request is then processed by the ECM with regard to current operating conditions and limitations.
Fuel injection is sequential and regulated with air mass per combustion and engine speed as parameters.