Analyzer of a vehicle's evaporative emissions
US6401528B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1999 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Sep 16, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/042
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A process and apparatus are disclosed for estimating evaporative fuel emission losses from a vehicle having a hydrocarbon-fueled engine operating under control of a microprocessor-based powertrain controller, a fuel tank with an evaporated fuel emission control system comprising a fuel vapor adsorbtion means connected to the tank and engine, and a diagnostic system that detects malfunctions in the vapor adsorbtion means. The process and apparatus measures temperature inside the vehicle passenger compartment at successive times when the engine is not running and determines the lowest temperature during partial diurnal and diurnal cooling cycles and uses such temperature along with any malfunction data to estimate evaporated fuel loss during a test period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.