Leak detection in a closed vapor handling system using pressure, temperature and time
US6539927B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 2001 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Feb 21, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0809
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of leak detection in a closed vapor handling system of an automotive vehicle, wherein an engine is shut off, implemented by a system, the method including obtaining a start temperature and start pressure, providing an evaluation temperature, calculating a temperature differential between the start temperature and the evaluation temperature, incrementing a time counter if the temperature differential is greater than a temperature control value, computing a pressure differential between the start pressure and an evaluation pressure, and comparing the time counter to a time control value if the pressure differential is not greater than a pressure control value. The system includes a pressure sensing element, a temperature sensing element, and a processor operatively coupled to the pressure sensing element and the temperature sensing element and receiving, respectively, pressure and temperature signals therefrom, wherein the processor calculates a temperature differential between a start temperature and an evaluation temperature, increments a time counter, computes a pressure differential between a start pressure and an evaluation pressure, and compares the time counter to the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.