ACTIVITY DETERMINATION SYSTEM OF OXYGEN SENSOR

摘要

PROBLEM TO BE SOLVED: To provide an activity determination system of an oxygen sensor capable of appropriately determining an inactive state of the oxygen sensor and preventing deterioration in exhaust.

SOLUTION: In an activity determination system of an oxygen sensor, a signal processing circuit outputs signals converging on a predetermined convergence value VP when the oxygen sensor is maintained in an inactive state. The inactive determination part determines that the oxygen sensor is in an inactive state when an output value Vd(n) from the signal processing circuit continuously changes for a predetermined period or longer toward the convergence value VP during execution of fuel cut operation or when the output value Vd(n) from the signal processing circuit changes for a predetermined amount or more toward the convergence value VP during execution of the fuel cut operation.

COPYRIGHT: (C)2013,JPO&INPIT