System and method for diagnosing a dual path purge system using a hydrocarbon sensor and for diagnosing a hydrocarbon sensor in a single path purge system or a dual path purge system
US9797344B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 2014 |
| Grant date | Oct 24, 2017 |
| Priority date | — |
| Expiry date | Nov 7, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/703
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system according to the present disclosure includes a valve control module, a purge fraction module, and a diagnostic module. The valve control module opens a purge valve in an evaporative emissions system to allow purge vapor to flow to an intake system of an engine. The purge fraction module determines first and second fractions of purge vapor delivered to the engine relative to a total amount of air and purge vapor delivered to the engine based on first and second inputs, respectively. The first input is from a hydrocarbon sensor disposed in the evaporative emissions system of the engine. The second input is from an oxygen sensor disposed in an exhaust system of the engine. The diagnostic module selectively diagnoses a fault in at least one of the evaporative emissions system and the hydrocarbon sensor based on the first and second purge fractions when the purge valve is open.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.