Gas density ratio detector, gas concentration detector, and fuel vapor treatment apparatus
US7234450B1 · kind B1 · utility
8Cited by
13References
5Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 5, 2006 |
| Grant date | Jun 26, 2007 |
| Priority date | — |
| Expiry date | Apr 5, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/0032
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
When a gas flow producer is driven, plural kinds of gases flow into a measure-passage at respective timing. An orifice is provided in the measure-passage. The orifice has a diameter-changing portion which restricts a separation of gases from an inner surface of the measure-passage. A pressure sensor is provided in the measure-passage to detect a pressure determined by the orifice and the gas flow producer. A microcomputer calculates a density ratio between the gases based on the detected differential pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.