Self-diagnosis apparatus and method for fuel evaporative emission
US5419299A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1993 |
| Grant date | May 30, 1995 |
| Priority date | — |
| Expiry date | Nov 30, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0809
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A self-diagnosis apparatus and method for use in a fuel evaporative emission control system for a vehicle having an internal combustion engine. A space part of a fuel tank is coupled with an intake air passage via a vapor passage. Fuel vapors from the fuel tank pass through the vapor passage. A canister is provided in the vapor passage to absorb the fuel vapors from the fuel tank. The internal pressure of the space part of the fuel tank is detected by a pressure detecting unit. The quantity of change in the internal pressure during the lapse of a certain time period is calculated by a calculating unit. The internal pressure change quantity is compared with a predetermined reference value, and thus abnormality is judged by a judgement unit in accordance with the comparison result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.