Method to adjust an internal combustion engine and internal combustion engine

A method to adjust an internal combustion engine (6) for a motor vehicle (1);

• said internal combustion engine (6) comprising:
• a first bank (8) comprising, in turn, at least one first cylinder (10), inside which a first piston (15) can slide;
• said first piston (15) being capable of sliding relative to said first cylinder (10) between a first bottom dead centre (PMI), where it defines, with said first cylinder (10), a first maximum volume chamber (17), and a first top dead centre (PMS), where the volume of said first chamber (17) is minimum;
• a first adjustment member (20), which can be controlled so as to adjust a first quantity of air (Q1) flowing into said first chamber (18);
• a first ignition member (22), which can be controlled so as to determine the ignition of an air and fuel mixture inside said first chamber (17);
• a second bank (9) comprising, in turn, at least one second cylinder (11), inside which a second piston (16) can slide;
• said second piston (16) being capable of sliding between a second bottom dead centre (PMI), where it defines, with said second cylinder (11), a second maximum volume chamber (18), and a second top dead centre (PMS), where the volume of said second chamber (18) is minimum;
• a second adjustment member (21), which can be controlled so as to adjust a second quantity of air (Q2) flowing into said second chamber (18) of said second cylinder (11);
• said internal combustion engine (6) further comprising:
• a second ignition member (23), which can be controlled so as to determine the ignition of an air and fuel mixture inside said second chamber (18);
• a driving member (12), which is operatively connected to said first and second piston (15, 16), can rotate around an axis (A) and delivers, in use, a resulting torque (C, Cadj) equal to the sum of a first torque (C1, C2, C3, C4, C5, C6) transmitted by said first piston (15) to said driving member (12) and of a second torque (C7, C8, C9, C10, C11, C12) transmitted by said second piston (16) to said driving member (12);
• said torque (C, Cadj) delivered by said internal combustion engine (6) being capable of being represented as the sum of a plurality of first sinusoidal signals, each having a respective first frequency (f1, . . . fk, . . . fn) and a respective first amplitude (A1, . . . Ak, . . . An);
• said internal combustion engine (6) further comprising:
• a control unit (30) operatively connected to said first and second adjustment member (20, 21) and to said first and second ignition members (22, 23);
• said method comprising the steps of:
• i) controlling said first and second adjustment member (20, 21) so as to adjust said first and second quantity of air (Q1, Q2);
• and
• ii) operating said first and second ignition member (22, 23) with a first and second advance angle (θ1, θ2), respectively, relative to said first and second top dead centre (PMI, PMS) of the respective first and second piston (15, 16);
• said first quantity of air (Q1) and said first advance angle (θ1) being associated with a value of first torque (C1, C2, C3, C4, C5, C6) transmitted by said first piston (15) to said driving member (12);
• said second quantity of air (Q2) and said first advance angle (θ2) being associated with a value of second torque (C7, C8, C9, C10, C11, C12) transmitted by said second piston (16) to said driving member (12);
• characterized by the steps of:
• iii) processing a value of a first one (Ak) of said first amplitudes (A1, . . . Ak, . . . An) associated with a respective frequency (fk);
• iv) detecting that said first amplitude (Ak) of at least one signal at a corresponding desired frequency (fk) exceeds a first threshold value (Akth);
• and
• v) correcting said first advance angle (θ1) and said first quantity of air (Q1) or said second advance angle (θ2) and said second quantity of air (Q2) so as to maintain a first average value (Cavg) of said resulting torque (C, Cadj) constant at two complete rotations of said driving member (12).