Diagnostic Method
Calculate faf difference every 32 ms x 4, and the λ value difference. Calculate the diagnosis value after calculating 820 time(s).
- Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgement Value
JUDGEMENT VALUE REFERENCE
| Malfunction Criteria | Threshold Value |
|---|---|
| parafca = td2faf/td2lmd | 0.22 |
| where, | |
| td2faf (N) = td2faf (n-1) + |d2faf (n)| | |
| td2lmd (N) = td2lmd (n-1) + |d2lmd (n)| | |
| add up to 32 ms x 4 x 820 time(s). | |
| d2faf (n) = (faf (n) - faf (n-1)) - (faf (n-1) - faf (n-2)) | |
| d2lmd (n) = (lmd (n) - lmd (n-1)) - (lmd (n-1) - lmd (n-2)) | |
| faf = main feedback compensation coefficient every 128 milliseconds | |
| lmd = output lambda every 128 milliseconds |
Time Needed for Diagnosis: 32 ms x 4 x 820 time(s)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more than the predetermined time.
Judgement Value
JUDGEMENT VALUE REFERENCE
| Malfunction Criteria | Threshold Value |
|---|---|
| parafca = td2faf/td2lmd | ≤ 0.22 |
| where, | |
| td2faf (N) = td2faf (n-1) + |d2faf (n)| | |
| td2lmd (N) = td2lmd (n-1) + |d2lmd (n)| | |
| add up to 32 ms x 4 x 820 time(s). | |
| d2faf (n) = (faf (n) - faf (n-1)) - (faf (n-1) - faf (n-2)) | |
| d2lmd (n) = (lmd (n) - lmd (n-1)) - (lmd (n-1) - lmd (n-2)) | |
| faf = main feedback compensation coefficient every 128 milliseconds | |
| lmd = output lambda every 128 milliseconds |
Time Needed for Diagnosis: 32 ms x 4 x 820 time(s)