Patent ID: 7942133

Claim:
A control method of an electronic injection fuel feeding system ( 12 ) for an internal combustion engine ( 1 ) and including at least one injector ( 13 ) and a non-continuous flow rate fuel pump ( 14 ) actuated by a an actuator device ( 27 ); the control method including the steps of: determining the desired fuel amount (M fuel ) which must be injected at each cycle of the internal combustion engine ( 1 ); driving the injector ( 3 ) for injecting the desired fuel amount (M fuel ) at each cycle of the internal combustion engine ( 1 ) and at an injection frequency (F inj ) depending on the rotation speed of the internal combustion engine ( 1 ); determining an optimal pumping frequency (F pump ) of the actuator device ( 27 ) of the fuel pump ( 14 ) according to the desired fuel amount (M fuel ) which must be injected at each cycle of the internal combustion engine ( 1 ); and actuating the actuator device ( 27 ) of the fuel pump ( 14 ) at the optimal pumping frequency (F pump ); the control method is characterized in that it includes the further steps of: determining in a design phase, a lower threshold value (Th 1 ) and a higher threshold value (Th 2 ); comparing the desired fuel amount (M fuel ) with the two threshold values (Th 1 , Th 2 ); assigning to the optimal pumping frequency (F pump ) a value which is independent from the injection frequency (F inj ) when the desired fuel amount (M fuel ) is lower than the lower threshold value (Th 1 ) or when the desired fuel amount (M fuel ) is higher than the higher threshold value (Th 2 ) in order to drive the fuel pump ( 14 ) in an asynchronous manner with respect to the driving of the injector ( 3 ); and assigning to the optimal pumping frequency (F pump ) the same value of the injection frequency (F inj ) when the desired fuel amount (M fuel ) is comprised between the two threshold values (Th 1 , Th 2 ) in order to drive the fuel pump ( 14 ) in a synchronous manner with respect to the driving of the injector ( 3 ).