Exhaust gas component concentration sensing device and method of detecting failure thereof
US4951632A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1989 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | Apr 21, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4175
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of detecting failure of an exhaust gas component concentration sensor for detecting concentration of a component of exhaust gases from an internal combustion engine. The method comprises the steps of: (1) applying a predetermined voltage to the sensor, (2) determining whether or not a change in an output voltage from the sensor caused by the application of the predetermined voltage to the sensor is smaller than a predetermined value, and (3) deciding that the sensor is faulty when the change in the output voltage is smaller than the predetermined value. A device for sensing concentration of a component of exhaust gases from an internal combustion engine comprising an electric resistance member connected in series between an electric current supply source and one of a pair of electrodes provided on a solid electrolytic element. A device for detecting failure of an exhaust gas component concentration sensing device comprising a constant voltage supply source for applying a predetermined voltage to the sensing device, and a switch connected between the constant voltage supply source and one of a pair of electrodes provided on an electrolytic element of the sensing device, for…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.