Evaporative emission control system for an internal combustion engine
US4308842A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1979 |
| Grant date | Jan 5, 1982 |
| Priority date | — |
| Expiry date | Sep 28, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2025/0845
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An evaporative emission control system for an internal combustion engine, in which fuel vapors generated in a fuel reservoir are stored in a fuel vapor storage canister when the engine is stopped so that the fuel vapors may be used when the engine is in operation. A purge control valve is disposed on a discharge port of the canister. The purge control valve is designed so that it is not opened unless a temperature of the engine exceeds a level above a predetermined threshold even when the engine is in operation. When the engine is operated at a low temperature, the stored fuel vapors in the canister are not released for stabilization in the air-fuel ratio of a mixture fed to the engine, and when the engine is operated at a high temperature, the stored fuel vapors are released into the engine to effectively consume the fuel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.