Ultrasonic device for the determination of the rate of air flow in the inlet duct of an internal combustion engine
US4104915A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 7, 1977 |
| Grant date | Aug 8, 1978 |
| Priority date | — |
| Expiry date | Jul 7, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/662
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A device for determining the rate of flow of air in the intake duct of an internal combustion engine comprises a detector duct of generally rectangular cross section housing two ultrasonic detectors one at each end, lying adjacent the detector duct is an intake duct having an inlet air filter which also serves as an ultrasonic acoustic filter. Adjacent ends of the intake and detector ducts are joined by a deflector which turns the air through 180.degree. as it passes from the intake duct to the detector duct. Within the deflector are fins which guide the air and turn it with the minimum of pressure loss and turbulence; adjacent the deflector in the intake duct is located a set of fins serving to diffuse the air as it passes, to reduce any temperature or velocity gradient across its width, and adjacent the deflector in the detector duct is located a set of fins serving to guide the air stream and reduce turbulence maintaining the even pressure and temperature across the stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.