System and method for monitoring by ion current the combustion in an internal combustion engine

A monitoring system, configured to monitor via ion current a combustion in an internal combustion engine of a vehicle, said internal combustion engine including at least one cylinder defining a combustion chamber and having associated therewith a first spark plug, facing the combustion chamber, and a second spark plug, arranged at a prechamber communicating with the combustion chamber through one or more connecting openings, said monitoring system comprising:

• a digital processing unit provided with at least one acquisition channel associated with the at least one cylinder and electrically coupled to the corresponding first and second spark plugs so as to receive a first and, respectively, a second ion current signal, as a function of an ion flow between respective electrodes of the first and second spark plugs,
• wherein said digital processing unit is configured to jointly process said first and second ion current signals, to implement monitoring of the combustion of a fuel-air mixture in the combustion chamber.