Air-flow meter for internal combustion engine
US4494405A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1982 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Aug 5, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F15/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An air-flow meter wherein a bypass air passage for bypassing a main air passage is provided in a throttle chamber of an internal combustion engine, and a hot wire is arranged within the bypass air passage, with the amount of air flow being measured on the basis of a change in the resistance of the hot wire. A portion for diverting the direction of air streams is disposed in an upstream part of the bypass air passage so as to assign a dust removing function, and a diameter of the hot wire is selected so that dust particles flowing to the vicinity of the hot wire do not adhere to the hot wire. A surface of the hot wire is coated with glass, and a temperature of the surface of the hot wire is maintained at or above about 100.degree. C. to enhance the prevention of dust particles adhering to the hot wire.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.