Method for controlling fuel injection in a multifuel internal-combustion engine in the event of a request for fuel switching

A method for controlling fuel injection in a multifuel internal-combustion engine (1); the control method envisages the steps of: receiving a request for fuel switching at a first instant (T 0 ); waiting, starting from the first instant (T 0 ), for a first time interval (A) during which fuel switching has never been performed; carrying out, starting from a second instant (T 1 ) and for a second time interval (B), fuel switching only if a cut-off phase or else an idling phase occurs; carrying out, starting from a third instant (T 2 ) and for a third time interval (C), fuel switching only if a cut-off phase, an idling phase, or else a stabilized-r.p.m. phase occurs; and carrying out, starting from a fourth instant (T 3 ) fuel switching in any condition.