Abnormality detecting device for evaporative fuel processing system
US6829921B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 2002 |
| Grant date | Dec 14, 2004 |
| Priority date | — |
| Expiry date | Apr 20, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0809
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An abnormality detecting device for an evaporative fuel processing system is disclosed. The evaporative fuel processing system includes a fuel tank, a canister for trapping evaporative fuel generated in the fuel tank, a charging passage for connecting the fuel tank and the canister, a tank pressure regulating valve provided in the charging passage, a bypass passage bypassing the tank pressure regulating valve, a bypass valve provided in the bypass passage, and a pressure sensor provided in the fuel tank or in the charging passage at a position between the tank pressure regulating valve and the fuel tank. The pressure in the canister is reduced to a pressure which is lower than the atmospheric pressure in the condition where a valve closing command signal for the bypass valve is output. It is determined that the tank pressure regulating valve or the bypass valve is abnormal, when the pressure detected by the pressure sensor becomes equal to or less than a predetermined threshold during execution of the pressure reduction in the canister.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.