Fuel evaporative emission amount detection system
US5259353A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1992 |
| Grant date | Nov 9, 1993 |
| Priority date | — |
| Expiry date | Apr 10, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/703
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A detecting system for condition of a fuel evaporative emission generated in a fuel tank, includes a pressure sensor and a three-way valve for selectively connecting the pressure sensor to atmosphere and the fuel tank. The pressure sensor is initially communicated with the atmosphere to detect an atmospheric pressure P.sub.a (step 110), and subsequently communicated with the fuel tank to detect an internal pressure P.sub.f of the fuel tank (step 130). Based on the atmospheric pressure P.sub.a and the internal pressure P.sub.f of the fuel tank, an amount EVP of the fuel evaporative emission generated in the fuel tank is derived through a map look-up against a preset map (step 150).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.