Patent ID: 11859527
Assignee: MARELLI EUROPE S.P.A.
Field: Environmental technology (Chemistry)
Classification: CPC F  Y | IPC F

Claim 5:
6. The method according to claim 1, wherein the air feeding device (23) comprises a shut-off valve (26), which is arranged downstream of the pumping device (24) and whose passage section is adjustable; the method comprises the further steps of:
determining a nominal passage section (αNOM) with which to operate the shut-off valve (26) depending on the objective air flow rate ({dot over (m)}A_OBJ), on an air pressure (PBURN) downstream of the shut-off valve (26), on an air temperature (TA) and on a pressure (PA) of the air flowing into the shut-off valve (26);
determining a closed-loop contribution (αCL) of the passage section with which to operate the shut-off valve (26) by means of a PID controller, which zeroes a difference between the objective value (λOBJ) of the air/fuel ratio and the actual value (2) of the air/fuel ratio measured by the oxygen sensor (18, 18*, 18**);
determining a further contribution (αADAT) of the passage section with which to operate the shut-off valve (26) depending on the integral action of the PID controller under stationary conditions;
determining an actual passage section (αOBJ) with which to operate the shut-off valve (26) by means of a sum of the nominal passage section (αNOM), the closed-loop contribution (αCL) and the further contribution (αADAT) of the passage section with which to operate the shut-off valve (26).