Hot wire type air flowmeter
US5537871A · kind A · utility
9Cited by
2References
10Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 6, 1994 |
| Grant date | Jul 23, 1996 |
| Priority date | — |
| Expiry date | Dec 6, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/696
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A hot wire type air flowmeter has a drive circuit for controlling the temperature of a hot wire type resistor and for outputting indications of controlling states as electric signals, an output adjusting circuit for adjusting the electric signals output from the drive circuit, and a subtracter provided in the output adjusting circuit of the hot wire type air flowmeter. The electric signals output from a non-inverting amplifier in the drive circuit are input to one input terminal of the subtracter and a standard voltage supplied via a voltage follower are input to the other input terminal of the subtracter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.