Method for detecting assembled state of gas sensors and apparatus for detecting assembled state of gas sensors
US7558667B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 5, 2007 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Sep 5, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1408
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A vehicle including plural gas sensors assembled in plural exhaust systems, detecting an oxygen concentration in an exhaust gas, where an air-fuel ratio feedback control is carried out together with an engine control unit. Each gas sensor detects signal of oxygen concentration corresponding to a group of cylinders. The method for detecting an assembled state of the gas sensor: controls an engine control parameter affecting the air-fuel ratio of the engine, so that the values thereof are different from each other for the plural groups of cylinders corresponding to the plural exhaust systems; monitors an output from the gas sensor under the controlled state, the gas sensor being installed in each of the plural exhaust systems; and judges that the gas sensor is in a wrong assembled state if the output from the gas sensor is an abnormal output corresponding to the value of the engine control parameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.