Testing method for fuel vapor treating apparatus
US5726354A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1996 |
| Grant date | Mar 10, 1998 |
| Priority date | — |
| Expiry date | Jul 30, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/089
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel vapor treating apparatus that collects fuel vapor produced in a fuel tank and treats the vapor without releasing it into the atmosphere. The treating apparatus is provided with a canister that collects the fuel vapor through a vapor line. A vapor control valve provided in the canister adjusts the flow of fuel vapor directed toward the canister from the tank. A purge line connects the canister to an air intake passage of an engine. The fuel collected in the canister is purged into the air intake passage through the purge line. A purge control valve provided in the purge line adjusts the flow rate of the fuel flowing through the purge line. A three-way valve selectively switches the section to which the pressure sensor is connected between the tank side and the canister side. An electronic control unit (ECU) controls the second control valve and the three-way valve. The ECU tests the sealing of the tank side and the canister side based on the tank pressure and the canister pressure, which are detected by the pressure sensor. The ECU controls the three-way valve to alternately connect the pressure sensor to the tank side and the canister side during a predetermined time period …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.