Evaporated fuel treatment apparatus for internal combustion engine
US6223732A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2000 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Feb 4, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0809
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An evaporated fuel treatment apparatus that includes a fuel tank, a canister with an opening to the atmosphere, a charging passage that causes the fuel tank to communicate with the canister, a purging passage that causes the canister to communicate with the intake manifold of the internal combustion engine, a pressure adjustment valve installed in the charging passage, a bypass valve installed in a passage that bypasses the pressure adjustment valve, a purge control valve installed in the purging passage, a vent shut valve capable of opening and closing the opening port, an internal pressure sensor for detecting the internal pressure of the fuel tank, and a controller that opens the fuel tank to atmospheric pressure or opens the fuel tank to a negative pressure by controlling the bypass valve, purge control valve, and vent shut valve. The apparatus of the invention detects the presence or absence of leakage on the basis of the change in negative pressure that occurs after the fuel tank has been placed under a negative pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.