| CPC F02D 43/04 (2013.01) [F01L 1/34 (2013.01); F02D 41/0002 (2013.01); F02P 5/15 (2013.01)] | 21 Claims |
|
1. 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).
|