I.C. engine airflow meter having speed-based automatic gain control
US5018385A · kind A · utility
4Cited by
1References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1990 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Mar 26, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F15/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The gain of the airflow meter electrical circuit is modified as a function of engine speed such that at any given throttle opening the gain over one portion of the engine speed range is different from what it is over another portion of the engine speed range. In the disclosed embodiment gain is greater over a lower portion of the speed range than it is over a higher portion of the speed range so that the airflow meter is endowed with increased resolution at low engine speeds where such increased resolution is beneficial. The invention is especially well suited for a hot-wire anemometer type airflow meter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.