Evaporative fuel-processing system for internal combustion engines
US5775307A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1997 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Mar 19, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0809
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An evaporative fuel-processing system for an internal combustion engine includes a canister, a charging passage extending between the canister and the fuel tank, a purging passage extending between the canister and the intake system of the engine, an open-to-atmosphere passage for relieving the interior of the canister to atmosphere, a charge control valve, a purge control valve, a vent shut valve, a pressure sensor for detecting pressure within the charging passage, and a float valve arranged at an end of the charging passage opening into the fuel tank. When the engine is in a predetermined operating condition, the interior of the canister is negatively pressurized into a predetermined negatively pressurized state by opening the purge control valve and the charge control valve and closing the vent shut valve. The interior of the changing passage is stabilized by closing the charge control valve and the purge control valve over a predetermined time period after the negative pressurization. When the predetermined time period has elapsed, the charge control valve is opened, and abnormality of the canister is determined based on the pressure detected by the pressure sensor after the o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.