| 摘要 |
<P>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. <P>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. An inactive determination part determines that the oxygen sensor is in an inactive state when an output value Vd(n) from the signal processing circuit is within a predetermined inactive range Rna containing the convergence value VP. The inactive determination part determines that the oxygen sensor is in an active state when the output value Vd(n) from the signal processing circuit is in a predetermined first active range Ra1 which is different from the inactive range Rna. The inactive determination part determines that the oxygen sensor is in an inactive state when the output value Vd(n) from the signal processing circuit exceeds a predetermined threshold value Vth contained in the first active range Ra1 toward the convergence value VP during execution of fuel cut operation. <P>COPYRIGHT: (C)2013,JPO&INPIT |
