System and method for controlling a nitrogen oxide sensor
US8707677B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2011 |
| Grant date | Apr 29, 2014 |
| Priority date | — |
| Expiry date | Sep 14, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A vehicle includes an engine having an exhaust port, an exhaust system for conditioning an engine exhaust stream, a nitrogen oxide (NOx) sensor positioned within the exhaust stream, and a controller. The controller has an out-of-range diagnostic tool for evaluating a range performance of the sensor. The controller detects a predetermined engine-on fuel shutoff event, and then temporarily disables the diagnostic tool during the fuel shutoff event. The fuel shutoff event may be a vehicle deceleration-based event. A selective catalytic reduction (SCR) device may be positioned within the exhaust system, with at least one NOx sensor positioned at the outlet of the SCR device. An additional NOx sensor may be positioned in proximity to the exhaust port. A method for use aboard the above vehicle includes detecting the engine-on fuel shutoff event via the controller, and temporarily disabling the diagnostic tool for the duration of the detected fuel shutoff event.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.