Method and apparatus for detecting a fault condition of a lambda probe
US5054452A · kind A · utility
19Cited by
10References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1990 |
| Grant date | Oct 8, 1991 |
| Priority date | — |
| Expiry date | Jul 30, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4175
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a heatable lambda probe, the probe voltage is first measured with the heater switched off and then with the heater switched on. The difference between the two voltages is formed and, when it exceeds a predetermined threshold difference, a shunt signal is output which indicates that the probe is not yet ready for operation. Otherwise, the system is examined for readiness for closed-loop control in the conventional manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.